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+      #
+      #
       # Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Google Inc.
+      #
       # This program is free software; you can redistribute it and/or modify
       # it under the terms of the GNU General Public License as published by
       # the Free Software Foundation; either version 2 of the License, or
       # (at your option) any later version.
+      #
       # This program is distributed in the hope that it will be useful, but
       # WITHOUT ANY WARRANTY; without even the implied warranty of
       # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
       # General Public License for more details.
+      #
       # You should have received a copy of the GNU General Public License
       # along with this program; if not, write to the Free Software
       # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
       # 02110-1301, USA.
       """Module implementing the master-side code."""
       # pylint: disable=W0201,C0302
       # W0201 since most LU attributes are defined in CheckPrereq or similar
       # functions
       # C0302: since we have waaaay too many lines in this module
       import os
       import os.path
       import time
       import re
       import platform
       import logging
       import copy
       import OpenSSL
       import socket
       import tempfile
       import shutil
       import itertools
       import operator
       from ganeti import ssh
       from ganeti import utils
       from ganeti import errors
       from ganeti import hypervisor
       from ganeti import locking
       from ganeti import constants
       from ganeti import objects
       from ganeti import serializer
       from ganeti import ssconf
       from ganeti import uidpool
       from ganeti import compat
       from ganeti import masterd
       from ganeti import netutils
       from ganeti import query
       from ganeti import qlang
       from ganeti import opcodes
       from ganeti import ht
       from ganeti import rpc
       import ganeti.masterd.instance # pylint: disable=W0611
       #: Size of DRBD meta block device
       DRBD_META_SIZE = 128
       # States of instance
       INSTANCE_UP = [constants.ADMINST_UP]
       INSTANCE_DOWN = [constants.ADMINST_DOWN]
       INSTANCE_OFFLINE = [constants.ADMINST_OFFLINE]
       INSTANCE_ONLINE = [constants.ADMINST_DOWN, constants.ADMINST_UP]
       INSTANCE_NOT_RUNNING = [constants.ADMINST_DOWN, constants.ADMINST_OFFLINE]
       class ResultWithJobs:
         """Data container for LU results with jobs.
         Instances of this class returned from L{LogicalUnit.Exec} will be recognized
         by L{mcpu.Processor._ProcessResult}. The latter will then submit the jobs
         contained in the C{jobs} attribute and include the job IDs in the opcode
         result.
         """
         def __init__(self, jobs, **kwargs):
           """Initializes this class.
           Additional return values can be specified as keyword arguments.
           @type jobs: list of lists of L{opcode.OpCode}
           @param jobs: A list of lists of opcode objects
           """
           self.jobs = jobs
           self.other = kwargs
       class LogicalUnit(object):
         """Logical Unit base class.
         Subclasses must follow these rules:
           - implement ExpandNames
           - implement CheckPrereq (except when tasklets are used)
           - implement Exec (except when tasklets are used)
           - implement BuildHooksEnv
           - implement BuildHooksNodes
           - redefine HPATH and HTYPE
           - optionally redefine their run requirements:
               REQ_BGL: the LU needs to hold the Big Ganeti Lock exclusively
         Note that all commands require root permissions.
         @ivar dry_run_result: the value (if any) that will be returned to the caller
             in dry-run mode (signalled by opcode dry_run parameter)
         """
         HPATH = None
         HTYPE = None
         REQ_BGL = True
         def __init__(self, processor, op, context, rpc_runner):
           """Constructor for LogicalUnit.
           This needs to be overridden in derived classes in order to check op
           validity.
           """
           self.proc = processor
           self.op = op
           self.cfg = context.cfg
           self.glm = context.glm
           # readability alias
           self.owned_locks = context.glm.list_owned
           self.context = context
           self.rpc = rpc_runner
           # Dicts used to declare locking needs to mcpu
           self.needed_locks = None
           self.share_locks = dict.fromkeys(locking.LEVELS, 0)
           self.add_locks = {}
           self.remove_locks = {}
           # Used to force good behavior when calling helper functions
           self.recalculate_locks = {}
           # logging
           self.Log = processor.Log # pylint: disable=C0103
           self.LogWarning = processor.LogWarning # pylint: disable=C0103
           self.LogInfo = processor.LogInfo # pylint: disable=C0103
           self.LogStep = processor.LogStep # pylint: disable=C0103
           # support for dry-run
           self.dry_run_result = None
           # support for generic debug attribute
           if (not hasattr(self.op, "debug_level") or
               not isinstance(self.op.debug_level, int)):
             self.op.debug_level = 0
           # Tasklets
           self.tasklets = None
           # Validate opcode parameters and set defaults
           self.op.Validate(True)
           self.CheckArguments()
         def CheckArguments(self):
           """Check syntactic validity for the opcode arguments.
           This method is for doing a simple syntactic check and ensure
           validity of opcode parameters, without any cluster-related
           checks. While the same can be accomplished in ExpandNames and/or
           CheckPrereq, doing these separate is better because:
             - ExpandNames is left as as purely a lock-related function
             - CheckPrereq is run after we have acquired locks (and possible
               waited for them)
           The function is allowed to change the self.op attribute so that
           later methods can no longer worry about missing parameters.
           """
           pass
         def ExpandNames(self):
           """Expand names for this LU.
           This method is called before starting to execute the opcode, and it should
           update all the parameters of the opcode to their canonical form (e.g. a
           short node name must be fully expanded after this method has successfully
           completed). This way locking, hooks, logging, etc. can work correctly.
           LUs which implement this method must also populate the self.needed_locks
           member, as a dict with lock levels as keys, and a list of needed lock names
           as values. Rules:
             - use an empty dict if you don't need any lock
             - if you don't need any lock at a particular level omit that level
             - don't put anything for the BGL level
             - if you want all locks at a level use locking.ALL_SET as a value
           If you need to share locks (rather than acquire them exclusively) at one
           level you can modify self.share_locks, setting a true value (usually 1) for
           that level. By default locks are not shared.
           This function can also define a list of tasklets, which then will be
           executed in order instead of the usual LU-level CheckPrereq and Exec
           functions, if those are not defined by the LU.
           Examples::
             # Acquire all nodes and one instance
             self.needed_locks = {
               locking.LEVEL_NODE: locking.ALL_SET,
               locking.LEVEL_INSTANCE: ['instance1.example.com'],
+            }
             # Acquire just two nodes
             self.needed_locks = {
               locking.LEVEL_NODE: ['node1.example.com', 'node2.example.com'],
+            }
             # Acquire no locks
             self.needed_locks = {} # No, you can't leave it to the default value None
           """
           # The implementation of this method is mandatory only if the new LU is
           # concurrent, so that old LUs don't need to be changed all at the same
           # time.
           if self.REQ_BGL:
             self.needed_locks = {} # Exclusive LUs don't need locks.
           else:
             raise NotImplementedError
         def DeclareLocks(self, level):
           """Declare LU locking needs for a level
           While most LUs can just declare their locking needs at ExpandNames time,
           sometimes there's the need to calculate some locks after having acquired
           the ones before. This function is called just before acquiring locks at a
           particular level, but after acquiring the ones at lower levels, and permits
           such calculations. It can be used to modify self.needed_locks, and by
           default it does nothing.
           This function is only called if you have something already set in
           self.needed_locks for the level.
           @param level: Locking level which is going to be locked
           @type level: member of ganeti.locking.LEVELS
           """
         def CheckPrereq(self):
           """Check prerequisites for this LU.
           This method should check that the prerequisites for the execution
           of this LU are fulfilled. It can do internode communication, but
           it should be idempotent - no cluster or system changes are
           allowed.
           The method should raise errors.OpPrereqError in case something is
           not fulfilled. Its return value is ignored.
           This method should also update all the parameters of the opcode to
           their canonical form if it hasn't been done by ExpandNames before.
           """
           if self.tasklets is not None:
             for (idx, tl) in enumerate(self.tasklets):
               logging.debug("Checking prerequisites for tasklet %s/%s",
                             idx + 1, len(self.tasklets))
               tl.CheckPrereq()
           else:
             pass
         def Exec(self, feedback_fn):
           """Execute the LU.
           This method should implement the actual work. It should raise
           errors.OpExecError for failures that are somewhat dealt with in
           code, or expected.
           """
           if self.tasklets is not None:
             for (idx, tl) in enumerate(self.tasklets):
               logging.debug("Executing tasklet %s/%s", idx + 1, len(self.tasklets))
               tl.Exec(feedback_fn)
           else:
             raise NotImplementedError
         def BuildHooksEnv(self):
           """Build hooks environment for this LU.
           @rtype: dict
           @return: Dictionary containing the environment that will be used for
             running the hooks for this LU. The keys of the dict must not be prefixed
             with "GANETI_"--that'll be added by the hooks runner. The hooks runner
             will extend the environment with additional variables. If no environment
             should be defined, an empty dictionary should be returned (not C{None}).
           @note: If the C{HPATH} attribute of the LU class is C{None}, this function
             will not be called.
           """
           raise NotImplementedError
         def BuildHooksNodes(self):
           """Build list of nodes to run LU's hooks.
           @rtype: tuple; (list, list)
           @return: Tuple containing a list of node names on which the hook
             should run before the execution and a list of node names on which the
             hook should run after the execution. No nodes should be returned as an
             empty list (and not None).
           @note: If the C{HPATH} attribute of the LU class is C{None}, this function
             will not be called.
           """
           raise NotImplementedError
         def HooksCallBack(self, phase, hook_results, feedback_fn, lu_result):
           """Notify the LU about the results of its hooks.
           This method is called every time a hooks phase is executed, and notifies
           the Logical Unit about the hooks' result. The LU can then use it to alter
           its result based on the hooks.  By default the method does nothing and the
           previous result is passed back unchanged but any LU can define it if it
           wants to use the local cluster hook-scripts somehow.
           @param phase: one of L{constants.HOOKS_PHASE_POST} or
               L{constants.HOOKS_PHASE_PRE}; it denotes the hooks phase
           @param hook_results: the results of the multi-node hooks rpc call
           @param feedback_fn: function used send feedback back to the caller
           @param lu_result: the previous Exec result this LU had, or None
               in the PRE phase
           @return: the new Exec result, based on the previous result
               and hook results
           """
           # API must be kept, thus we ignore the unused argument and could
           # be a function warnings
           # pylint: disable=W0613,R0201
           return lu_result
         def _ExpandAndLockInstance(self):
           """Helper function to expand and lock an instance.
           Many LUs that work on an instance take its name in self.op.instance_name
           and need to expand it and then declare the expanded name for locking. This
           function does it, and then updates self.op.instance_name to the expanded
           name. It also initializes needed_locks as a dict, if this hasn't been done
           before.
           """
           if self.needed_locks is None:
             self.needed_locks = {}
           else:
             assert locking.LEVEL_INSTANCE not in self.needed_locks, \
               "_ExpandAndLockInstance called with instance-level locks set"
           self.op.instance_name = _ExpandInstanceName(self.cfg,
                                                       self.op.instance_name)
           self.needed_locks[locking.LEVEL_INSTANCE] = self.op.instance_name
         def _LockInstancesNodes(self, primary_only=False,
                                 level=locking.LEVEL_NODE):
           """Helper function to declare instances' nodes for locking.
           This function should be called after locking one or more instances to lock
           their nodes. Its effect is populating self.needed_locks[locking.LEVEL_NODE]
           with all primary or secondary nodes for instances already locked and
           present in self.needed_locks[locking.LEVEL_INSTANCE].
           It should be called from DeclareLocks, and for safety only works if
           self.recalculate_locks[locking.LEVEL_NODE] is set.
           In the future it may grow parameters to just lock some instance's nodes, or
           to just lock primaries or secondary nodes, if needed.
           If should be called in DeclareLocks in a way similar to::
             if level == locking.LEVEL_NODE:
               self._LockInstancesNodes()
           @type primary_only: boolean
           @param primary_only: only lock primary nodes of locked instances
           @param level: Which lock level to use for locking nodes
           """
           assert level in self.recalculate_locks, \
             "_LockInstancesNodes helper function called with no nodes to recalculate"
           # TODO: check if we're really been called with the instance locks held
           # For now we'll replace self.needed_locks[locking.LEVEL_NODE], but in the
           # future we might want to have different behaviors depending on the value
           # of self.recalculate_locks[locking.LEVEL_NODE]
           wanted_nodes = []
           locked_i = self.owned_locks(locking.LEVEL_INSTANCE)
           for _, instance in self.cfg.GetMultiInstanceInfo(locked_i):
             wanted_nodes.append(instance.primary_node)
             if not primary_only:
               wanted_nodes.extend(instance.secondary_nodes)
           if self.recalculate_locks[level] == constants.LOCKS_REPLACE:
             self.needed_locks[level] = wanted_nodes
           elif self.recalculate_locks[level] == constants.LOCKS_APPEND:
             self.needed_locks[level].extend(wanted_nodes)
           else:
             raise errors.ProgrammerError("Unknown recalculation mode")
           del self.recalculate_locks[level]
       class NoHooksLU(LogicalUnit): # pylint: disable=W0223
         """Simple LU which runs no hooks.
         This LU is intended as a parent for other LogicalUnits which will
         run no hooks, in order to reduce duplicate code.
         """
         HPATH = None
         HTYPE = None
         def BuildHooksEnv(self):
           """Empty BuildHooksEnv for NoHooksLu.
           This just raises an error.
           """
           raise AssertionError("BuildHooksEnv called for NoHooksLUs")
         def BuildHooksNodes(self):
           """Empty BuildHooksNodes for NoHooksLU.
           """
           raise AssertionError("BuildHooksNodes called for NoHooksLU")
       class Tasklet:
         """Tasklet base class.
         Tasklets are subcomponents for LUs. LUs can consist entirely of tasklets or
         they can mix legacy code with tasklets. Locking needs to be done in the LU,
         tasklets know nothing about locks.
         Subclasses must follow these rules:
           - Implement CheckPrereq
           - Implement Exec
         """
         def __init__(self, lu):
           self.lu = lu
           # Shortcuts
           self.cfg = lu.cfg
           self.rpc = lu.rpc
         def CheckPrereq(self):
           """Check prerequisites for this tasklets.
           This method should check whether the prerequisites for the execution of
           this tasklet are fulfilled. It can do internode communication, but it
           should be idempotent - no cluster or system changes are allowed.
           The method should raise errors.OpPrereqError in case something is not
           fulfilled. Its return value is ignored.
           This method should also update all parameters to their canonical form if it
           hasn't been done before.
           """
           pass
         def Exec(self, feedback_fn):
           """Execute the tasklet.
           This method should implement the actual work. It should raise
           errors.OpExecError for failures that are somewhat dealt with in code, or
           expected.
           """
           raise NotImplementedError
       class _QueryBase:
         """Base for query utility classes.
         """
         #: Attribute holding field definitions
         FIELDS = None
         def __init__(self, qfilter, fields, use_locking):
           """Initializes this class.
           """
           self.use_locking = use_locking
           self.query = query.Query(self.FIELDS, fields, qfilter=qfilter,
                                    namefield="name")
           self.requested_data = self.query.RequestedData()
           self.names = self.query.RequestedNames()
           # Sort only if no names were requested
           self.sort_by_name = not self.names
           self.do_locking = None
           self.wanted = None
         def _GetNames(self, lu, all_names, lock_level):
           """Helper function to determine names asked for in the query.
           """
           if self.do_locking:
             names = lu.owned_locks(lock_level)
           else:
             names = all_names
           if self.wanted == locking.ALL_SET:
             assert not self.names
             # caller didn't specify names, so ordering is not important
             return utils.NiceSort(names)
           # caller specified names and we must keep the same order
           assert self.names
           assert not self.do_locking or lu.glm.is_owned(lock_level)
           missing = set(self.wanted).difference(names)
           if missing:
             raise errors.OpExecError("Some items were removed before retrieving"
                                      " their data: %s" % missing)
           # Return expanded names
           return self.wanted
         def ExpandNames(self, lu):
           """Expand names for this query.
           See L{LogicalUnit.ExpandNames}.
           """
           raise NotImplementedError()
         def DeclareLocks(self, lu, level):
           """Declare locks for this query.
           See L{LogicalUnit.DeclareLocks}.
           """
           raise NotImplementedError()
         def _GetQueryData(self, lu):
           """Collects all data for this query.
           @return: Query data object
           """
           raise NotImplementedError()
         def NewStyleQuery(self, lu):
           """Collect data and execute query.
           """
           return query.GetQueryResponse(self.query, self._GetQueryData(lu),
                                         sort_by_name=self.sort_by_name)
         def OldStyleQuery(self, lu):
           """Collect data and execute query.
           """
           return self.query.OldStyleQuery(self._GetQueryData(lu),
                                           sort_by_name=self.sort_by_name)
       def _ShareAll():
         """Returns a dict declaring all lock levels shared.
         """
         return dict.fromkeys(locking.LEVELS, 1)
       def _MakeLegacyNodeInfo(data):
         """Formats the data returned by L{rpc.RpcRunner.call_node_info}.
         Converts the data into a single dictionary. This is fine for most use cases,
         but some require information from more than one volume group or hypervisor.
         """
         (bootid, (vg_info, ), (hv_info, )) = data
         return utils.JoinDisjointDicts(utils.JoinDisjointDicts(vg_info, hv_info), {
           "bootid": bootid,
           })
       def _CheckInstanceNodeGroups(cfg, instance_name, owned_groups):
         """Checks if the owned node groups are still correct for an instance.
         @type cfg: L{config.ConfigWriter}
         @param cfg: The cluster configuration
         @type instance_name: string
         @param instance_name: Instance name
         @type owned_groups: set or frozenset
         @param owned_groups: List of currently owned node groups
         """
         inst_groups = cfg.GetInstanceNodeGroups(instance_name)
         if not owned_groups.issuperset(inst_groups):
           raise errors.OpPrereqError("Instance %s's node groups changed since"
                                      " locks were acquired, current groups are"
                                      " are '%s', owning groups '%s'; retry the"
                                      " operation" %
                                      (instance_name,
                                       utils.CommaJoin(inst_groups),
                                       utils.CommaJoin(owned_groups)),
                                      errors.ECODE_STATE)
         return inst_groups
       def _CheckNodeGroupInstances(cfg, group_uuid, owned_instances):
         """Checks if the instances in a node group are still correct.
         @type cfg: L{config.ConfigWriter}
         @param cfg: The cluster configuration
         @type group_uuid: string
         @param group_uuid: Node group UUID
         @type owned_instances: set or frozenset
         @param owned_instances: List of currently owned instances
         """
         wanted_instances = cfg.GetNodeGroupInstances(group_uuid)
         if owned_instances != wanted_instances:
           raise errors.OpPrereqError("Instances in node group '%s' changed since"
                                      " locks were acquired, wanted '%s', have '%s';"
                                      " retry the operation" %
                                      (group_uuid,
                                       utils.CommaJoin(wanted_instances),
                                       utils.CommaJoin(owned_instances)),
                                      errors.ECODE_STATE)
         return wanted_instances
       def _SupportsOob(cfg, node):
         """Tells if node supports OOB.
         @type cfg: L{config.ConfigWriter}
         @param cfg: The cluster configuration
         @type node: L{objects.Node}
         @param node: The node
         @return: The OOB script if supported or an empty string otherwise
         """
         return cfg.GetNdParams(node)[constants.ND_OOB_PROGRAM]
       def _GetWantedNodes(lu, nodes):
         """Returns list of checked and expanded node names.
         @type lu: L{LogicalUnit}
         @param lu: the logical unit on whose behalf we execute
         @type nodes: list
         @param nodes: list of node names or None for all nodes
         @rtype: list
         @return: the list of nodes, sorted
         @raise errors.ProgrammerError: if the nodes parameter is wrong type
         """
         if nodes:
           return [_ExpandNodeName(lu.cfg, name) for name in nodes]
         return utils.NiceSort(lu.cfg.GetNodeList())
       def _GetWantedInstances(lu, instances):
         """Returns list of checked and expanded instance names.
         @type lu: L{LogicalUnit}
         @param lu: the logical unit on whose behalf we execute
         @type instances: list
         @param instances: list of instance names or None for all instances
         @rtype: list
         @return: the list of instances, sorted
         @raise errors.OpPrereqError: if the instances parameter is wrong type
         @raise errors.OpPrereqError: if any of the passed instances is not found
         """
         if instances:
           wanted = [_ExpandInstanceName(lu.cfg, name) for name in instances]
         else:
           wanted = utils.NiceSort(lu.cfg.GetInstanceList())
         return wanted
       def _GetUpdatedParams(old_params, update_dict,
                             use_default=True, use_none=False):
         """Return the new version of a parameter dictionary.
         @type old_params: dict
         @param old_params: old parameters
         @type update_dict: dict
         @param update_dict: dict containing new parameter values, or
             constants.VALUE_DEFAULT to reset the parameter to its default
             value
         @param use_default: boolean
         @type use_default: whether to recognise L{constants.VALUE_DEFAULT}
             values as 'to be deleted' values
         @param use_none: boolean
         @type use_none: whether to recognise C{None} values as 'to be
             deleted' values
         @rtype: dict
         @return: the new parameter dictionary
         """
         params_copy = copy.deepcopy(old_params)
         for key, val in update_dict.iteritems():
           if ((use_default and val == constants.VALUE_DEFAULT) or
               (use_none and val is None)):
             try:
               del params_copy[key]
             except KeyError:
               pass
           else:
             params_copy[key] = val
         return params_copy
       def _ReleaseLocks(lu, level, names=None, keep=None):
         """Releases locks owned by an LU.
         @type lu: L{LogicalUnit}
         @param level: Lock level
         @type names: list or None
         @param names: Names of locks to release
         @type keep: list or None
         @param keep: Names of locks to retain
         """
         assert not (keep is not None and names is not None), \
                "Only one of the 'names' and the 'keep' parameters can be given"
         if names is not None:
           should_release = names.__contains__
         elif keep:
           should_release = lambda name: name not in keep
         else:
           should_release = None
         owned = lu.owned_locks(level)
         if not owned:
           # Not owning any lock at this level, do nothing
           pass
         elif should_release:
           retain = []
           release = []
           # Determine which locks to release
           for name in owned:
             if should_release(name):
               release.append(name)
             else:
               retain.append(name)
           assert len(lu.owned_locks(level)) == (len(retain) + len(release))
           # Release just some locks
           lu.glm.release(level, names=release)
           assert frozenset(lu.owned_locks(level)) == frozenset(retain)
         else:
           # Release everything
           lu.glm.release(level)
           assert not lu.glm.is_owned(level), "No locks should be owned"
       def _MapInstanceDisksToNodes(instances):
         """Creates a map from (node, volume) to instance name.
         @type instances: list of L{objects.Instance}
         @rtype: dict; tuple of (node name, volume name) as key, instance name as value
         """
         return dict(((node, vol), inst.name)
                     for inst in instances
                     for (node, vols) in inst.MapLVsByNode().items()
                     for vol in vols)
       def _RunPostHook(lu, node_name):
         """Runs the post-hook for an opcode on a single node.
         """
         hm = lu.proc.BuildHooksManager(lu)
         try:
           hm.RunPhase(constants.HOOKS_PHASE_POST, nodes=[node_name])
         except:
           # pylint: disable=W0702
           lu.LogWarning("Errors occurred running hooks on %s" % node_name)
       def _CheckOutputFields(static, dynamic, selected):
         """Checks whether all selected fields are valid.
         @type static: L{utils.FieldSet}
         @param static: static fields set
         @type dynamic: L{utils.FieldSet}
         @param dynamic: dynamic fields set
         """
         f = utils.FieldSet()
         f.Extend(static)
         f.Extend(dynamic)
         delta = f.NonMatching(selected)
         if delta:
           raise errors.OpPrereqError("Unknown output fields selected: %s"
                                      % ",".join(delta), errors.ECODE_INVAL)
       def _CheckGlobalHvParams(params):
         """Validates that given hypervisor params are not global ones.
         This will ensure that instances don't get customised versions of
         global params.
         """
         used_globals = constants.HVC_GLOBALS.intersection(params)
         if used_globals:
           msg = ("The following hypervisor parameters are global and cannot"
                  " be customized at instance level, please modify them at"
                  " cluster level: %s" % utils.CommaJoin(used_globals))
           raise errors.OpPrereqError(msg, errors.ECODE_INVAL)
       def _CheckNodeOnline(lu, node, msg=None):
         """Ensure that a given node is online.
         @param lu: the LU on behalf of which we make the check
         @param node: the node to check
         @param msg: if passed, should be a message to replace the default one
         @raise errors.OpPrereqError: if the node is offline
         """
         if msg is None:
           msg = "Can't use offline node"
         if lu.cfg.GetNodeInfo(node).offline:
           raise errors.OpPrereqError("%s: %s" % (msg, node), errors.ECODE_STATE)
       def _CheckNodeNotDrained(lu, node):
         """Ensure that a given node is not drained.
         @param lu: the LU on behalf of which we make the check
         @param node: the node to check
         @raise errors.OpPrereqError: if the node is drained
         """
         if lu.cfg.GetNodeInfo(node).drained:
           raise errors.OpPrereqError("Can't use drained node %s" % node,
                                      errors.ECODE_STATE)
       def _CheckNodeVmCapable(lu, node):
         """Ensure that a given node is vm capable.
         @param lu: the LU on behalf of which we make the check
         @param node: the node to check
         @raise errors.OpPrereqError: if the node is not vm capable
         """
         if not lu.cfg.GetNodeInfo(node).vm_capable:
           raise errors.OpPrereqError("Can't use non-vm_capable node %s" % node,
                                      errors.ECODE_STATE)
       def _CheckNodeHasOS(lu, node, os_name, force_variant):
         """Ensure that a node supports a given OS.
         @param lu: the LU on behalf of which we make the check
         @param node: the node to check
         @param os_name: the OS to query about
         @param force_variant: whether to ignore variant errors
         @raise errors.OpPrereqError: if the node is not supporting the OS
         """
         result = lu.rpc.call_os_get(node, os_name)
         result.Raise("OS '%s' not in supported OS list for node %s" %
                      (os_name, node),
                      prereq=True, ecode=errors.ECODE_INVAL)
         if not force_variant:
           _CheckOSVariant(result.payload, os_name)
       def _CheckNodeHasSecondaryIP(lu, node, secondary_ip, prereq):
         """Ensure that a node has the given secondary ip.
         @type lu: L{LogicalUnit}
         @param lu: the LU on behalf of which we make the check
         @type node: string
         @param node: the node to check
         @type secondary_ip: string
         @param secondary_ip: the ip to check
         @type prereq: boolean
         @param prereq: whether to throw a prerequisite or an execute error
         @raise errors.OpPrereqError: if the node doesn't have the ip, and prereq=True
         @raise errors.OpExecError: if the node doesn't have the ip, and prereq=False
         """
         result = lu.rpc.call_node_has_ip_address(node, secondary_ip)
         result.Raise("Failure checking secondary ip on node %s" % node,
                      prereq=prereq, ecode=errors.ECODE_ENVIRON)
         if not result.payload:
           msg = ("Node claims it doesn't have the secondary ip you gave (%s),"
                  " please fix and re-run this command" % secondary_ip)
           if prereq:
             raise errors.OpPrereqError(msg, errors.ECODE_ENVIRON)
           else:
             raise errors.OpExecError(msg)
       def _GetClusterDomainSecret():
         """Reads the cluster domain secret.
         """
         return utils.ReadOneLineFile(constants.CLUSTER_DOMAIN_SECRET_FILE,
                                      strict=True)
       def _CheckInstanceState(lu, instance, req_states, msg=None):
         """Ensure that an instance is in one of the required states.
         @param lu: the LU on behalf of which we make the check
         @param instance: the instance to check
         @param msg: if passed, should be a message to replace the default one
         @raise errors.OpPrereqError: if the instance is not in the required state
         """
         if msg is None:
           msg = "can't use instance from outside %s states" % ", ".join(req_states)
         if instance.admin_state not in req_states:
           raise errors.OpPrereqError("Instance %s is marked to be %s, %s" %
                                      (instance, instance.admin_state, msg),
                                      errors.ECODE_STATE)
         if constants.ADMINST_UP not in req_states:
           pnode = instance.primary_node
           ins_l = lu.rpc.call_instance_list([pnode], [instance.hypervisor])[pnode]
           ins_l.Raise("Can't contact node %s for instance information" % pnode,
                       prereq=True, ecode=errors.ECODE_ENVIRON)
           if instance.name in ins_l.payload:
             raise errors.OpPrereqError("Instance %s is running, %s" %
                                        (instance.name, msg), errors.ECODE_STATE)
       def _ExpandItemName(fn, name, kind):
         """Expand an item name.
         @param fn: the function to use for expansion
         @param name: requested item name
         @param kind: text description ('Node' or 'Instance')
         @return: the resolved (full) name
         @raise errors.OpPrereqError: if the item is not found
         """
         full_name = fn(name)
         if full_name is None:
           raise errors.OpPrereqError("%s '%s' not known" % (kind, name),
                                      errors.ECODE_NOENT)
         return full_name
       def _ExpandNodeName(cfg, name):
         """Wrapper over L{_ExpandItemName} for nodes."""
         return _ExpandItemName(cfg.ExpandNodeName, name, "Node")
       def _ExpandInstanceName(cfg, name):
         """Wrapper over L{_ExpandItemName} for instance."""
         return _ExpandItemName(cfg.ExpandInstanceName, name, "Instance")
       def _BuildInstanceHookEnv(name, primary_node, secondary_nodes, os_type, status,
                                 minmem, maxmem, vcpus, nics, disk_template, disks,
                                 bep, hvp, hypervisor_name, tags):
         """Builds instance related env variables for hooks
         This builds the hook environment from individual variables.
         @type name: string
         @param name: the name of the instance
         @type primary_node: string
         @param primary_node: the name of the instance's primary node
         @type secondary_nodes: list
         @param secondary_nodes: list of secondary nodes as strings
         @type os_type: string
         @param os_type: the name of the instance's OS
         @type status: string
         @param status: the desired status of the instance
         @type minmem: string
         @param minmem: the minimum memory size of the instance
         @type maxmem: string
         @param maxmem: the maximum memory size of the instance
         @type vcpus: string
         @param vcpus: the count of VCPUs the instance has
         @type nics: list
         @param nics: list of tuples (ip, mac, mode, link) representing
             the NICs the instance has
         @type disk_template: string
         @param disk_template: the disk template of the instance
         @type disks: list
         @param disks: the list of (size, mode) pairs
         @type bep: dict
         @param bep: the backend parameters for the instance
         @type hvp: dict
         @param hvp: the hypervisor parameters for the instance
         @type hypervisor_name: string
         @param hypervisor_name: the hypervisor for the instance
         @type tags: list
         @param tags: list of instance tags as strings
         @rtype: dict
         @return: the hook environment for this instance
         """
         env = {
           "OP_TARGET": name,
           "INSTANCE_NAME": name,
           "INSTANCE_PRIMARY": primary_node,
           "INSTANCE_SECONDARIES": " ".join(secondary_nodes),
           "INSTANCE_OS_TYPE": os_type,
           "INSTANCE_STATUS": status,
           "INSTANCE_MINMEM": minmem,
           "INSTANCE_MAXMEM": maxmem,
           # TODO(2.7) remove deprecated "memory" value
           "INSTANCE_MEMORY": maxmem,
           "INSTANCE_VCPUS": vcpus,
           "INSTANCE_DISK_TEMPLATE": disk_template,
           "INSTANCE_HYPERVISOR": hypervisor_name,
+        }
         if nics:
           nic_count = len(nics)
           for idx, (ip, mac, mode, link) in enumerate(nics):
             if ip is None:
               ip = ""
             env["INSTANCE_NIC%d_IP" % idx] = ip
             env["INSTANCE_NIC%d_MAC" % idx] = mac
             env["INSTANCE_NIC%d_MODE" % idx] = mode
             env["INSTANCE_NIC%d_LINK" % idx] = link
             if mode == constants.NIC_MODE_BRIDGED:
               env["INSTANCE_NIC%d_BRIDGE" % idx] = link
         else:
           nic_count = 0
         env["INSTANCE_NIC_COUNT"] = nic_count
         if disks:
           disk_count = len(disks)
           for idx, (size, mode) in enumerate(disks):
             env["INSTANCE_DISK%d_SIZE" % idx] = size
             env["INSTANCE_DISK%d_MODE" % idx] = mode
         else:
           disk_count = 0
         env["INSTANCE_DISK_COUNT"] = disk_count
         if not tags:
           tags = []
         env["INSTANCE_TAGS"] = " ".join(tags)
         for source, kind in [(bep, "BE"), (hvp, "HV")]:
           for key, value in source.items():
             env["INSTANCE_%s_%s" % (kind, key)] = value
         return env
       def _NICListToTuple(lu, nics):
         """Build a list of nic information tuples.
         This list is suitable to be passed to _BuildInstanceHookEnv or as a return
         value in LUInstanceQueryData.
         @type lu:  L{LogicalUnit}
         @param lu: the logical unit on whose behalf we execute
         @type nics: list of L{objects.NIC}
         @param nics: list of nics to convert to hooks tuples
         """
         hooks_nics = []
         cluster = lu.cfg.GetClusterInfo()
         for nic in nics:
           ip = nic.ip
           mac = nic.mac
           filled_params = cluster.SimpleFillNIC(nic.nicparams)
           mode = filled_params[constants.NIC_MODE]
           link = filled_params[constants.NIC_LINK]
           hooks_nics.append((ip, mac, mode, link))
         return hooks_nics
       def _BuildInstanceHookEnvByObject(lu, instance, override=None):
         """Builds instance related env variables for hooks from an object.
         @type lu: L{LogicalUnit}
         @param lu: the logical unit on whose behalf we execute
         @type instance: L{objects.Instance}
         @param instance: the instance for which we should build the
             environment
         @type override: dict
         @param override: dictionary with key/values that will override
             our values
         @rtype: dict
         @return: the hook environment dictionary
         """
         cluster = lu.cfg.GetClusterInfo()
         bep = cluster.FillBE(instance)
         hvp = cluster.FillHV(instance)
         args = {
           "name": instance.name,
           "primary_node": instance.primary_node,
           "secondary_nodes": instance.secondary_nodes,
           "os_type": instance.os,
           "status": instance.admin_state,
           "maxmem": bep[constants.BE_MAXMEM],
           "minmem": bep[constants.BE_MINMEM],
           "vcpus": bep[constants.BE_VCPUS],
           "nics": _NICListToTuple(lu, instance.nics),
           "disk_template": instance.disk_template,
           "disks": [(disk.size, disk.mode) for disk in instance.disks],
           "bep": bep,
           "hvp": hvp,
           "hypervisor_name": instance.hypervisor,
           "tags": instance.tags,
+        }
         if override:
           args.update(override)
         return _BuildInstanceHookEnv(**args) # pylint: disable=W0142
       def _AdjustCandidatePool(lu, exceptions):
         """Adjust the candidate pool after node operations.
         """
         mod_list = lu.cfg.MaintainCandidatePool(exceptions)
         if mod_list:
           lu.LogInfo("Promoted nodes to master candidate role: %s",
                      utils.CommaJoin(node.name for node in mod_list))
           for name in mod_list:
             lu.context.ReaddNode(name)
         mc_now, mc_max, _ = lu.cfg.GetMasterCandidateStats(exceptions)
         if mc_now > mc_max:
           lu.LogInfo("Note: more nodes are candidates (%d) than desired (%d)" %
                      (mc_now, mc_max))
       def _DecideSelfPromotion(lu, exceptions=None):
         """Decide whether I should promote myself as a master candidate.
         """
         cp_size = lu.cfg.GetClusterInfo().candidate_pool_size
         mc_now, mc_should, _ = lu.cfg.GetMasterCandidateStats(exceptions)
         # the new node will increase mc_max with one, so:
         mc_should = min(mc_should + 1, cp_size)
         return mc_now < mc_should
       def _CheckNicsBridgesExist(lu, target_nics, target_node):
         """Check that the brigdes needed by a list of nics exist.
         """
         cluster = lu.cfg.GetClusterInfo()
         paramslist = [cluster.SimpleFillNIC(nic.nicparams) for nic in target_nics]
         brlist = [params[constants.NIC_LINK] for params in paramslist
                   if params[constants.NIC_MODE] == constants.NIC_MODE_BRIDGED]
         if brlist:
           result = lu.rpc.call_bridges_exist(target_node, brlist)
           result.Raise("Error checking bridges on destination node '%s'" %
                        target_node, prereq=True, ecode=errors.ECODE_ENVIRON)
       def _CheckInstanceBridgesExist(lu, instance, node=None):
         """Check that the brigdes needed by an instance exist.
         """
         if node is None:
           node = instance.primary_node
         _CheckNicsBridgesExist(lu, instance.nics, node)
       def _CheckOSVariant(os_obj, name):
         """Check whether an OS name conforms to the os variants specification.
         @type os_obj: L{objects.OS}
         @param os_obj: OS object to check
         @type name: string
         @param name: OS name passed by the user, to check for validity
         """
         variant = objects.OS.GetVariant(name)
         if not os_obj.supported_variants:
           if variant:
             raise errors.OpPrereqError("OS '%s' doesn't support variants ('%s'"
                                        " passed)" % (os_obj.name, variant),
                                        errors.ECODE_INVAL)
           return
         if not variant:
           raise errors.OpPrereqError("OS name must include a variant",
                                      errors.ECODE_INVAL)
         if variant not in os_obj.supported_variants:
           raise errors.OpPrereqError("Unsupported OS variant", errors.ECODE_INVAL)
       def _GetNodeInstancesInner(cfg, fn):
         return [i for i in cfg.GetAllInstancesInfo().values() if fn(i)]
       def _GetNodeInstances(cfg, node_name):
         """Returns a list of all primary and secondary instances on a node.
         """
         return _GetNodeInstancesInner(cfg, lambda inst: node_name in inst.all_nodes)
       def _GetNodePrimaryInstances(cfg, node_name):
         """Returns primary instances on a node.
         """
         return _GetNodeInstancesInner(cfg,
                                       lambda inst: node_name == inst.primary_node)
       def _GetNodeSecondaryInstances(cfg, node_name):
         """Returns secondary instances on a node.
         """
         return _GetNodeInstancesInner(cfg,
                                       lambda inst: node_name in inst.secondary_nodes)
       def _GetStorageTypeArgs(cfg, storage_type):
         """Returns the arguments for a storage type.
         """
         # Special case for file storage
         if storage_type == constants.ST_FILE:
           # storage.FileStorage wants a list of storage directories
           return [[cfg.GetFileStorageDir(), cfg.GetSharedFileStorageDir()]]
         return []
       def _FindFaultyInstanceDisks(cfg, rpc_runner, instance, node_name, prereq):
         faulty = []
         for dev in instance.disks:
           cfg.SetDiskID(dev, node_name)
         result = rpc_runner.call_blockdev_getmirrorstatus(node_name, instance.disks)
         result.Raise("Failed to get disk status from node %s" % node_name,
                      prereq=prereq, ecode=errors.ECODE_ENVIRON)
         for idx, bdev_status in enumerate(result.payload):
           if bdev_status and bdev_status.ldisk_status == constants.LDS_FAULTY:
             faulty.append(idx)
         return faulty
       def _CheckIAllocatorOrNode(lu, iallocator_slot, node_slot):
         """Check the sanity of iallocator and node arguments and use the
         cluster-wide iallocator if appropriate.
         Check that at most one of (iallocator, node) is specified. If none is
         specified, then the LU's opcode's iallocator slot is filled with the
         cluster-wide default iallocator.
         @type iallocator_slot: string
         @param iallocator_slot: the name of the opcode iallocator slot
         @type node_slot: string
         @param node_slot: the name of the opcode target node slot
         """
         node = getattr(lu.op, node_slot, None)
         iallocator = getattr(lu.op, iallocator_slot, None)
         if node is not None and iallocator is not None:
           raise errors.OpPrereqError("Do not specify both, iallocator and node",
                                      errors.ECODE_INVAL)
         elif node is None and iallocator is None:
           default_iallocator = lu.cfg.GetDefaultIAllocator()
           if default_iallocator:
             setattr(lu.op, iallocator_slot, default_iallocator)
           else:
             raise errors.OpPrereqError("No iallocator or node given and no"
                                        " cluster-wide default iallocator found;"
                                        " please specify either an iallocator or a"
                                        " node, or set a cluster-wide default"
                                        " iallocator")
       def _GetDefaultIAllocator(cfg, iallocator):
         """Decides on which iallocator to use.
         @type cfg: L{config.ConfigWriter}
         @param cfg: Cluster configuration object
         @type iallocator: string or None
         @param iallocator: Iallocator specified in opcode
         @rtype: string
         @return: Iallocator name
         """
         if not iallocator:
           # Use default iallocator
           iallocator = cfg.GetDefaultIAllocator()
         if not iallocator:
           raise errors.OpPrereqError("No iallocator was specified, neither in the"
                                      " opcode nor as a cluster-wide default",
                                      errors.ECODE_INVAL)
         return iallocator
       class LUClusterPostInit(LogicalUnit):
         """Logical unit for running hooks after cluster initialization.
         """
         HPATH = "cluster-init"
         HTYPE = constants.HTYPE_CLUSTER
         def BuildHooksEnv(self):
           """Build hooks env.
           """
           return {
             "OP_TARGET": self.cfg.GetClusterName(),
+            }
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           return ([], [self.cfg.GetMasterNode()])
         def Exec(self, feedback_fn):
           """Nothing to do.
           """
           return True
       class LUClusterDestroy(LogicalUnit):
         """Logical unit for destroying the cluster.
         """
         HPATH = "cluster-destroy"
         HTYPE = constants.HTYPE_CLUSTER
         def BuildHooksEnv(self):
           """Build hooks env.
           """
           return {
             "OP_TARGET": self.cfg.GetClusterName(),
+            }
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           return ([], [])
         def CheckPrereq(self):
           """Check prerequisites.
           This checks whether the cluster is empty.
           Any errors are signaled by raising errors.OpPrereqError.
           """
           master = self.cfg.GetMasterNode()
           nodelist = self.cfg.GetNodeList()
           if len(nodelist) != 1 or nodelist[0] != master:
             raise errors.OpPrereqError("There are still %d node(s) in"
                                        " this cluster." % (len(nodelist) - 1),
                                        errors.ECODE_INVAL)
           instancelist = self.cfg.GetInstanceList()
           if instancelist:
             raise errors.OpPrereqError("There are still %d instance(s) in"
                                        " this cluster." % len(instancelist),
                                        errors.ECODE_INVAL)
         def Exec(self, feedback_fn):
           """Destroys the cluster.
           """
           master_params = self.cfg.GetMasterNetworkParameters()
           # Run post hooks on master node before it's removed
           _RunPostHook(self, master_params.name)
           ems = self.cfg.GetUseExternalMipScript()
           result = self.rpc.call_node_deactivate_master_ip(master_params.name,
                                                            master_params, ems)
           result.Raise("Could not disable the master role")
           return master_params.name
       def _VerifyCertificate(filename):
         """Verifies a certificate for L{LUClusterVerifyConfig}.
         @type filename: string
         @param filename: Path to PEM file
         """
         try:
           cert = OpenSSL.crypto.load_certificate(OpenSSL.crypto.FILETYPE_PEM,
                                                  utils.ReadFile(filename))
         except Exception, err: # pylint: disable=W0703
           return (LUClusterVerifyConfig.ETYPE_ERROR,
                   "Failed to load X509 certificate %s: %s" % (filename, err))
         (errcode, msg) = \
           utils.VerifyX509Certificate(cert, constants.SSL_CERT_EXPIRATION_WARN,
                                       constants.SSL_CERT_EXPIRATION_ERROR)
         if msg:
           fnamemsg = "While verifying %s: %s" % (filename, msg)
         else:
           fnamemsg = None
         if errcode is None:
           return (None, fnamemsg)
         elif errcode == utils.CERT_WARNING:
           return (LUClusterVerifyConfig.ETYPE_WARNING, fnamemsg)
         elif errcode == utils.CERT_ERROR:
           return (LUClusterVerifyConfig.ETYPE_ERROR, fnamemsg)
         raise errors.ProgrammerError("Unhandled certificate error code %r" % errcode)
       def _GetAllHypervisorParameters(cluster, instances):
         """Compute the set of all hypervisor parameters.
         @type cluster: L{objects.Cluster}
         @param cluster: the cluster object
         @param instances: list of L{objects.Instance}
         @param instances: additional instances from which to obtain parameters
         @rtype: list of (origin, hypervisor, parameters)
         @return: a list with all parameters found, indicating the hypervisor they
              apply to, and the origin (can be "cluster", "os X", or "instance Y")
         """
         hvp_data = []
         for hv_name in cluster.enabled_hypervisors:
           hvp_data.append(("cluster", hv_name, cluster.GetHVDefaults(hv_name)))
         for os_name, os_hvp in cluster.os_hvp.items():
           for hv_name, hv_params in os_hvp.items():
             if hv_params:
               full_params = cluster.GetHVDefaults(hv_name, os_name=os_name)
               hvp_data.append(("os %s" % os_name, hv_name, full_params))
         # TODO: collapse identical parameter values in a single one
         for instance in instances:
           if instance.hvparams:
             hvp_data.append(("instance %s" % instance.name, instance.hypervisor,
                              cluster.FillHV(instance)))
         return hvp_data
       class _VerifyErrors(object):
         """Mix-in for cluster/group verify LUs.
         It provides _Error and _ErrorIf, and updates the self.bad boolean. (Expects
         self.op and self._feedback_fn to be available.)
         """
         ETYPE_FIELD = "code"
         ETYPE_ERROR = "ERROR"
         ETYPE_WARNING = "WARNING"
         def _Error(self, ecode, item, msg, *args, **kwargs):
           """Format an error message.
           Based on the opcode's error_codes parameter, either format a
           parseable error code, or a simpler error string.
           This must be called only from Exec and functions called from Exec.
           """
           ltype = kwargs.get(self.ETYPE_FIELD, self.ETYPE_ERROR)
           itype, etxt, _ = ecode
           # first complete the msg
           if args:
             msg = msg % args
           # then format the whole message
           if self.op.error_codes: # This is a mix-in. pylint: disable=E1101
             msg = "%s:%s:%s:%s:%s" % (ltype, etxt, itype, item, msg)
           else:
             if item:
               item = " " + item
             else:
               item = ""
             msg = "%s: %s%s: %s" % (ltype, itype, item, msg)
           # and finally report it via the feedback_fn
           self._feedback_fn("  - %s" % msg) # Mix-in. pylint: disable=E1101
         def _ErrorIf(self, cond, ecode, *args, **kwargs):
           """Log an error message if the passed condition is True.
           """
           cond = (bool(cond)
                   or self.op.debug_simulate_errors) # pylint: disable=E1101
           # If the error code is in the list of ignored errors, demote the error to a
           # warning
           (_, etxt, _) = ecode
           if etxt in self.op.ignore_errors:     # pylint: disable=E1101
             kwargs[self.ETYPE_FIELD] = self.ETYPE_WARNING
           if cond:
             self._Error(ecode, *args, **kwargs)
           # do not mark the operation as failed for WARN cases only
           if kwargs.get(self.ETYPE_FIELD, self.ETYPE_ERROR) == self.ETYPE_ERROR:
             self.bad = self.bad or cond
       class LUClusterVerify(NoHooksLU):
         """Submits all jobs necessary to verify the cluster.
         """
         REQ_BGL = False
         def ExpandNames(self):
           self.needed_locks = {}
         def Exec(self, feedback_fn):
           jobs = []
           if self.op.group_name:
             groups = [self.op.group_name]
             depends_fn = lambda: None
           else:
             groups = self.cfg.GetNodeGroupList()
             # Verify global configuration
             jobs.append([
               opcodes.OpClusterVerifyConfig(ignore_errors=self.op.ignore_errors)
               ])
             # Always depend on global verification
             depends_fn = lambda: [(-len(jobs), [])]
           jobs.extend([opcodes.OpClusterVerifyGroup(group_name=group,
                                                   ignore_errors=self.op.ignore_errors,
                                                   depends=depends_fn())]
                       for group in groups)
           # Fix up all parameters
           for op in itertools.chain(*jobs): # pylint: disable=W0142
             op.debug_simulate_errors = self.op.debug_simulate_errors
             op.verbose = self.op.verbose
             op.error_codes = self.op.error_codes
             try:
               op.skip_checks = self.op.skip_checks
             except AttributeError:
               assert not isinstance(op, opcodes.OpClusterVerifyGroup)
           return ResultWithJobs(jobs)
       class LUClusterVerifyConfig(NoHooksLU, _VerifyErrors):
         """Verifies the cluster config.
         """
         REQ_BGL = True
         def _VerifyHVP(self, hvp_data):
           """Verifies locally the syntax of the hypervisor parameters.
           """
           for item, hv_name, hv_params in hvp_data:
             msg = ("hypervisor %s parameters syntax check (source %s): %%s" %
                    (item, hv_name))
             try:
               hv_class = hypervisor.GetHypervisor(hv_name)
               utils.ForceDictType(hv_params, constants.HVS_PARAMETER_TYPES)
               hv_class.CheckParameterSyntax(hv_params)
             except errors.GenericError, err:
               self._ErrorIf(True, constants.CV_ECLUSTERCFG, None, msg % str(err))
         def ExpandNames(self):
           # Information can be safely retrieved as the BGL is acquired in exclusive
           # mode
           assert locking.BGL in self.owned_locks(locking.LEVEL_CLUSTER)
           self.all_group_info = self.cfg.GetAllNodeGroupsInfo()
           self.all_node_info = self.cfg.GetAllNodesInfo()
           self.all_inst_info = self.cfg.GetAllInstancesInfo()
           self.needed_locks = {}
         def Exec(self, feedback_fn):
           """Verify integrity of cluster, performing various test on nodes.
           """
           self.bad = False
           self._feedback_fn = feedback_fn
           feedback_fn("* Verifying cluster config")
           for msg in self.cfg.VerifyConfig():
             self._ErrorIf(True, constants.CV_ECLUSTERCFG, None, msg)
           feedback_fn("* Verifying cluster certificate files")
           for cert_filename in constants.ALL_CERT_FILES:
             (errcode, msg) = _VerifyCertificate(cert_filename)
             self._ErrorIf(errcode, constants.CV_ECLUSTERCERT, None, msg, code=errcode)
           feedback_fn("* Verifying hypervisor parameters")
           self._VerifyHVP(_GetAllHypervisorParameters(self.cfg.GetClusterInfo(),
                                                       self.all_inst_info.values()))
           feedback_fn("* Verifying all nodes belong to an existing group")
           # We do this verification here because, should this bogus circumstance
           # occur, it would never be caught by VerifyGroup, which only acts on
           # nodes/instances reachable from existing node groups.
           dangling_nodes = set(node.name for node in self.all_node_info.values()
                                if node.group not in self.all_group_info)
           dangling_instances = {}
           no_node_instances = []
           for inst in self.all_inst_info.values():
             if inst.primary_node in dangling_nodes:
               dangling_instances.setdefault(inst.primary_node, []).append(inst.name)
             elif inst.primary_node not in self.all_node_info:
               no_node_instances.append(inst.name)
           pretty_dangling = [
               "%s (%s)" %
               (node.name,
                utils.CommaJoin(dangling_instances.get(node.name,
                                                       ["no instances"])))
               for node in dangling_nodes]
           self._ErrorIf(bool(dangling_nodes), constants.CV_ECLUSTERDANGLINGNODES,
                         None,
                         "the following nodes (and their instances) belong to a non"
                         " existing group: %s", utils.CommaJoin(pretty_dangling))
           self._ErrorIf(bool(no_node_instances), constants.CV_ECLUSTERDANGLINGINST,
                         None,
                         "the following instances have a non-existing primary-node:"
                         " %s", utils.CommaJoin(no_node_instances))
           return not self.bad
       class LUClusterVerifyGroup(LogicalUnit, _VerifyErrors):
         """Verifies the status of a node group.
         """
         HPATH = "cluster-verify"
         HTYPE = constants.HTYPE_CLUSTER
         REQ_BGL = False
         _HOOKS_INDENT_RE = re.compile("^", re.M)
         class NodeImage(object):
           """A class representing the logical and physical status of a node.
           @type name: string
           @ivar name: the node name to which this object refers
           @ivar volumes: a structure as returned from
               L{ganeti.backend.GetVolumeList} (runtime)
           @ivar instances: a list of running instances (runtime)
           @ivar pinst: list of configured primary instances (config)
           @ivar sinst: list of configured secondary instances (config)
           @ivar sbp: dictionary of {primary-node: list of instances} for all
               instances for which this node is secondary (config)
           @ivar mfree: free memory, as reported by hypervisor (runtime)
           @ivar dfree: free disk, as reported by the node (runtime)
           @ivar offline: the offline status (config)
           @type rpc_fail: boolean
           @ivar rpc_fail: whether the RPC verify call was successfull (overall,
               not whether the individual keys were correct) (runtime)
           @type lvm_fail: boolean
           @ivar lvm_fail: whether the RPC call didn't return valid LVM data
           @type hyp_fail: boolean
           @ivar hyp_fail: whether the RPC call didn't return the instance list
           @type ghost: boolean
           @ivar ghost: whether this is a known node or not (config)
           @type os_fail: boolean
           @ivar os_fail: whether the RPC call didn't return valid OS data
           @type oslist: list
           @ivar oslist: list of OSes as diagnosed by DiagnoseOS
           @type vm_capable: boolean
           @ivar vm_capable: whether the node can host instances
           """
           def __init__(self, offline=False, name=None, vm_capable=True):
             self.name = name
             self.volumes = {}
             self.instances = []
             self.pinst = []
             self.sinst = []
             self.sbp = {}
             self.mfree = 0
             self.dfree = 0
             self.offline = offline
             self.vm_capable = vm_capable
             self.rpc_fail = False
             self.lvm_fail = False
             self.hyp_fail = False
             self.ghost = False
             self.os_fail = False
             self.oslist = {}
         def ExpandNames(self):
           # This raises errors.OpPrereqError on its own:
           self.group_uuid = self.cfg.LookupNodeGroup(self.op.group_name)
           # Get instances in node group; this is unsafe and needs verification later
           inst_names = self.cfg.GetNodeGroupInstances(self.group_uuid)
           self.needed_locks = {
             locking.LEVEL_INSTANCE: inst_names,
             locking.LEVEL_NODEGROUP: [self.group_uuid],
             locking.LEVEL_NODE: [],
+            }
           self.share_locks = _ShareAll()
         def DeclareLocks(self, level):
           if level == locking.LEVEL_NODE:
             # Get members of node group; this is unsafe and needs verification later
             nodes = set(self.cfg.GetNodeGroup(self.group_uuid).members)
             all_inst_info = self.cfg.GetAllInstancesInfo()
             # In Exec(), we warn about mirrored instances that have primary and
             # secondary living in separate node groups. To fully verify that
             # volumes for these instances are healthy, we will need to do an
             # extra call to their secondaries. We ensure here those nodes will
             # be locked.
             for inst in self.owned_locks(locking.LEVEL_INSTANCE):
               # Important: access only the instances whose lock is owned
               if all_inst_info[inst].disk_template in constants.DTS_INT_MIRROR:
                 nodes.update(all_inst_info[inst].secondary_nodes)
             self.needed_locks[locking.LEVEL_NODE] = nodes
         def CheckPrereq(self):
           assert self.group_uuid in self.owned_locks(locking.LEVEL_NODEGROUP)
           self.group_info = self.cfg.GetNodeGroup(self.group_uuid)
           group_nodes = set(self.group_info.members)
           group_instances = self.cfg.GetNodeGroupInstances(self.group_uuid)
           unlocked_nodes = \
               group_nodes.difference(self.owned_locks(locking.LEVEL_NODE))
           unlocked_instances = \
               group_instances.difference(self.owned_locks(locking.LEVEL_INSTANCE))
           if unlocked_nodes:
             raise errors.OpPrereqError("Missing lock for nodes: %s" %
                                        utils.CommaJoin(unlocked_nodes))
           if unlocked_instances:
             raise errors.OpPrereqError("Missing lock for instances: %s" %
                                        utils.CommaJoin(unlocked_instances))
           self.all_node_info = self.cfg.GetAllNodesInfo()
           self.all_inst_info = self.cfg.GetAllInstancesInfo()
           self.my_node_names = utils.NiceSort(group_nodes)
           self.my_inst_names = utils.NiceSort(group_instances)
           self.my_node_info = dict((name, self.all_node_info[name])
                                    for name in self.my_node_names)
           self.my_inst_info = dict((name, self.all_inst_info[name])
                                    for name in self.my_inst_names)
           # We detect here the nodes that will need the extra RPC calls for verifying
           # split LV volumes; they should be locked.
           extra_lv_nodes = set()
           for inst in self.my_inst_info.values():
             if inst.disk_template in constants.DTS_INT_MIRROR:
               group = self.my_node_info[inst.primary_node].group
               for nname in inst.secondary_nodes:
                 if self.all_node_info[nname].group != group:
                   extra_lv_nodes.add(nname)
           unlocked_lv_nodes = \
               extra_lv_nodes.difference(self.owned_locks(locking.LEVEL_NODE))
           if unlocked_lv_nodes:
             raise errors.OpPrereqError("these nodes could be locked: %s" %
                                        utils.CommaJoin(unlocked_lv_nodes))
           self.extra_lv_nodes = list(extra_lv_nodes)
         def _VerifyNode(self, ninfo, nresult):
           """Perform some basic validation on data returned from a node.
             - check the result data structure is well formed and has all the
               mandatory fields
             - check ganeti version
           @type ninfo: L{objects.Node}
           @param ninfo: the node to check
           @param nresult: the results from the node
           @rtype: boolean
           @return: whether overall this call was successful (and we can expect
                reasonable values in the respose)
           """
           node = ninfo.name
           _ErrorIf = self._ErrorIf # pylint: disable=C0103
           # main result, nresult should be a non-empty dict
           test = not nresult or not isinstance(nresult, dict)
           _ErrorIf(test, constants.CV_ENODERPC, node,
                         "unable to verify node: no data returned")
           if test:
             return False
           # compares ganeti version
           local_version = constants.PROTOCOL_VERSION
           remote_version = nresult.get("version", None)
           test = not (remote_version and
                       isinstance(remote_version, (list, tuple)) and
                       len(remote_version) == 2)
           _ErrorIf(test, constants.CV_ENODERPC, node,
                    "connection to node returned invalid data")
           if test:
             return False
           test = local_version != remote_version[0]
           _ErrorIf(test, constants.CV_ENODEVERSION, node,
                    "incompatible protocol versions: master %s,"
                    " node %s", local_version, remote_version[0])
           if test:
             return False
           # node seems compatible, we can actually try to look into its results
           # full package version
           self._ErrorIf(constants.RELEASE_VERSION != remote_version[1],
                         constants.CV_ENODEVERSION, node,
                         "software version mismatch: master %s, node %s",
                         constants.RELEASE_VERSION, remote_version[1],
                         code=self.ETYPE_WARNING)
           hyp_result = nresult.get(constants.NV_HYPERVISOR, None)
           if ninfo.vm_capable and isinstance(hyp_result, dict):
             for hv_name, hv_result in hyp_result.iteritems():
               test = hv_result is not None
               _ErrorIf(test, constants.CV_ENODEHV, node,
                        "hypervisor %s verify failure: '%s'", hv_name, hv_result)
           hvp_result = nresult.get(constants.NV_HVPARAMS, None)
           if ninfo.vm_capable and isinstance(hvp_result, list):
             for item, hv_name, hv_result in hvp_result:
               _ErrorIf(True, constants.CV_ENODEHV, node,
                        "hypervisor %s parameter verify failure (source %s): %s",
                        hv_name, item, hv_result)
           test = nresult.get(constants.NV_NODESETUP,
                              ["Missing NODESETUP results"])
           _ErrorIf(test, constants.CV_ENODESETUP, node, "node setup error: %s",
                    "; ".join(test))
           return True
         def _VerifyNodeTime(self, ninfo, nresult,
                             nvinfo_starttime, nvinfo_endtime):
           """Check the node time.
           @type ninfo: L{objects.Node}
           @param ninfo: the node to check
           @param nresult: the remote results for the node
           @param nvinfo_starttime: the start time of the RPC call
           @param nvinfo_endtime: the end time of the RPC call
           """
           node = ninfo.name
           _ErrorIf = self._ErrorIf # pylint: disable=C0103
           ntime = nresult.get(constants.NV_TIME, None)
           try:
             ntime_merged = utils.MergeTime(ntime)
           except (ValueError, TypeError):
             _ErrorIf(True, constants.CV_ENODETIME, node, "Node returned invalid time")
             return
           if ntime_merged < (nvinfo_starttime - constants.NODE_MAX_CLOCK_SKEW):
             ntime_diff = "%.01fs" % abs(nvinfo_starttime - ntime_merged)
           elif ntime_merged > (nvinfo_endtime + constants.NODE_MAX_CLOCK_SKEW):
             ntime_diff = "%.01fs" % abs(ntime_merged - nvinfo_endtime)
           else:
             ntime_diff = None
           _ErrorIf(ntime_diff is not None, constants.CV_ENODETIME, node,
                    "Node time diverges by at least %s from master node time",
                    ntime_diff)
         def _VerifyNodeLVM(self, ninfo, nresult, vg_name):
           """Check the node LVM results.
           @type ninfo: L{objects.Node}
           @param ninfo: the node to check
           @param nresult: the remote results for the node
           @param vg_name: the configured VG name
           """
           if vg_name is None:
             return
           node = ninfo.name
           _ErrorIf = self._ErrorIf # pylint: disable=C0103
           # checks vg existence and size > 20G
           vglist = nresult.get(constants.NV_VGLIST, None)
           test = not vglist
           _ErrorIf(test, constants.CV_ENODELVM, node, "unable to check volume groups")
           if not test:
             vgstatus = utils.CheckVolumeGroupSize(vglist, vg_name,
                                                   constants.MIN_VG_SIZE)
             _ErrorIf(vgstatus, constants.CV_ENODELVM, node, vgstatus)
           # check pv names
           pvlist = nresult.get(constants.NV_PVLIST, None)
           test = pvlist is None
           _ErrorIf(test, constants.CV_ENODELVM, node, "Can't get PV list from node")
           if not test:
             # check that ':' is not present in PV names, since it's a
             # special character for lvcreate (denotes the range of PEs to
             # use on the PV)
             for _, pvname, owner_vg in pvlist:
               test = ":" in pvname
               _ErrorIf(test, constants.CV_ENODELVM, node,
                        "Invalid character ':' in PV '%s' of VG '%s'",
                        pvname, owner_vg)
         def _VerifyNodeBridges(self, ninfo, nresult, bridges):
           """Check the node bridges.
           @type ninfo: L{objects.Node}
           @param ninfo: the node to check
           @param nresult: the remote results for the node
           @param bridges: the expected list of bridges
           """
           if not bridges:
             return
           node = ninfo.name
           _ErrorIf = self._ErrorIf # pylint: disable=C0103
           missing = nresult.get(constants.NV_BRIDGES, None)
           test = not isinstance(missing, list)
           _ErrorIf(test, constants.CV_ENODENET, node,
                    "did not return valid bridge information")
           if not test:
             _ErrorIf(bool(missing), constants.CV_ENODENET, node,
                      "missing bridges: %s" % utils.CommaJoin(sorted(missing)))
         def _VerifyNodeUserScripts(self, ninfo, nresult):
           """Check the results of user scripts presence and executability on the node
           @type ninfo: L{objects.Node}
           @param ninfo: the node to check
           @param nresult: the remote results for the node
           """
           node = ninfo.name
           test = not constants.NV_USERSCRIPTS in nresult
           self._ErrorIf(test, constants.CV_ENODEUSERSCRIPTS, node,
                         "did not return user scripts information")
           broken_scripts = nresult.get(constants.NV_USERSCRIPTS, None)
           if not test:
             self._ErrorIf(broken_scripts, constants.CV_ENODEUSERSCRIPTS, node,
                           "user scripts not present or not executable: %s" %
                           utils.CommaJoin(sorted(broken_scripts)))
         def _VerifyNodeNetwork(self, ninfo, nresult):
           """Check the node network connectivity results.
           @type ninfo: L{objects.Node}
           @param ninfo: the node to check
           @param nresult: the remote results for the node
           """
           node = ninfo.name
           _ErrorIf = self._ErrorIf # pylint: disable=C0103
           test = constants.NV_NODELIST not in nresult
           _ErrorIf(test, constants.CV_ENODESSH, node,
                    "node hasn't returned node ssh connectivity data")
           if not test:
             if nresult[constants.NV_NODELIST]:
               for a_node, a_msg in nresult[constants.NV_NODELIST].items():
                 _ErrorIf(True, constants.CV_ENODESSH, node,
                          "ssh communication with node '%s': %s", a_node, a_msg)
           test = constants.NV_NODENETTEST not in nresult
           _ErrorIf(test, constants.CV_ENODENET, node,
                    "node hasn't returned node tcp connectivity data")
           if not test:
             if nresult[constants.NV_NODENETTEST]:
               nlist = utils.NiceSort(nresult[constants.NV_NODENETTEST].keys())
               for anode in nlist:
                 _ErrorIf(True, constants.CV_ENODENET, node,
                          "tcp communication with node '%s': %s",
                          anode, nresult[constants.NV_NODENETTEST][anode])
           test = constants.NV_MASTERIP not in nresult
           _ErrorIf(test, constants.CV_ENODENET, node,
                    "node hasn't returned node master IP reachability data")
           if not test:
             if not nresult[constants.NV_MASTERIP]:
               if node == self.master_node:
                 msg = "the master node cannot reach the master IP (not configured?)"
               else:
                 msg = "cannot reach the master IP"
               _ErrorIf(True, constants.CV_ENODENET, node, msg)
         def _VerifyInstance(self, instance, instanceconfig, node_image,
                             diskstatus):
           """Verify an instance.
           This function checks to see if the required block devices are
           available on the instance's node.
           """
           _ErrorIf = self._ErrorIf # pylint: disable=C0103
           node_current = instanceconfig.primary_node
           node_vol_should = {}
           instanceconfig.MapLVsByNode(node_vol_should)
           for node in node_vol_should:
             n_img = node_image[node]
             if n_img.offline or n_img.rpc_fail or n_img.lvm_fail:
               # ignore missing volumes on offline or broken nodes
               continue
             for volume in node_vol_should[node]:
               test = volume not in n_img.volumes
               _ErrorIf(test, constants.CV_EINSTANCEMISSINGDISK, instance,
                        "volume %s missing on node %s", volume, node)
           if instanceconfig.admin_state == constants.ADMINST_UP:
             pri_img = node_image[node_current]
             test = instance not in pri_img.instances and not pri_img.offline
             _ErrorIf(test, constants.CV_EINSTANCEDOWN, instance,
                      "instance not running on its primary node %s",
                      node_current)
           diskdata = [(nname, success, status, idx)
                       for (nname, disks) in diskstatus.items()
                       for idx, (success, status) in enumerate(disks)]
           for nname, success, bdev_status, idx in diskdata:
             # the 'ghost node' construction in Exec() ensures that we have a
             # node here
             snode = node_image[nname]
             bad_snode = snode.ghost or snode.offline
             _ErrorIf(instanceconfig.admin_state == constants.ADMINST_UP and
                      not success and not bad_snode,
                      constants.CV_EINSTANCEFAULTYDISK, instance,
                      "couldn't retrieve status for disk/%s on %s: %s",
                      idx, nname, bdev_status)
             _ErrorIf((instanceconfig.admin_state == constants.ADMINST_UP and
                       success and bdev_status.ldisk_status == constants.LDS_FAULTY),
                      constants.CV_EINSTANCEFAULTYDISK, instance,
                      "disk/%s on %s is faulty", idx, nname)
         def _VerifyOrphanVolumes(self, node_vol_should, node_image, reserved):
           """Verify if there are any unknown volumes in the cluster.
           The .os, .swap and backup volumes are ignored. All other volumes are
           reported as unknown.
           @type reserved: L{ganeti.utils.FieldSet}
           @param reserved: a FieldSet of reserved volume names
           """
           for node, n_img in node_image.items():
             if n_img.offline or n_img.rpc_fail or n_img.lvm_fail:
               # skip non-healthy nodes
               continue
             for volume in n_img.volumes:
               test = ((node not in node_vol_should or
                       volume not in node_vol_should[node]) and
                       not reserved.Matches(volume))
               self._ErrorIf(test, constants.CV_ENODEORPHANLV, node,
                             "volume %s is unknown", volume)
         def _VerifyNPlusOneMemory(self, node_image, instance_cfg):
           """Verify N+1 Memory Resilience.
           Check that if one single node dies we can still start all the
           instances it was primary for.
           """
           cluster_info = self.cfg.GetClusterInfo()
           for node, n_img in node_image.items():
             # This code checks that every node which is now listed as
             # secondary has enough memory to host all instances it is
             # supposed to should a single other node in the cluster fail.
             # FIXME: not ready for failover to an arbitrary node
             # FIXME: does not support file-backed instances
             # WARNING: we currently take into account down instances as well
             # as up ones, considering that even if they're down someone
             # might want to start them even in the event of a node failure.
             if n_img.offline:
               # we're skipping offline nodes from the N+1 warning, since
               # most likely we don't have good memory infromation from them;
               # we already list instances living on such nodes, and that's
               # enough warning
               continue
             #TODO(dynmem): use MINMEM for checking
             #TODO(dynmem): also consider ballooning out other instances
             for prinode, instances in n_img.sbp.items():
               needed_mem = 0
               for instance in instances:
                 bep = cluster_info.FillBE(instance_cfg[instance])
                 if bep[constants.BE_AUTO_BALANCE]:
                   needed_mem += bep[constants.BE_MAXMEM]
               test = n_img.mfree < needed_mem
               self._ErrorIf(test, constants.CV_ENODEN1, node,
                             "not enough memory to accomodate instance failovers"
                             " should node %s fail (%dMiB needed, %dMiB available)",
                             prinode, needed_mem, n_img.mfree)
         @classmethod
         def _VerifyFiles(cls, errorif, nodeinfo, master_node, all_nvinfo,
                          (files_all, files_opt, files_mc, files_vm)):
           """Verifies file checksums collected from all nodes.
           @param errorif: Callback for reporting errors
           @param nodeinfo: List of L{objects.Node} objects
           @param master_node: Name of master node
           @param all_nvinfo: RPC results
           """
           # Define functions determining which nodes to consider for a file
           files2nodefn = [
             (files_all, None),
             (files_mc, lambda node: (node.master_candidate or
                                      node.name == master_node)),
             (files_vm, lambda node: node.vm_capable),
+            ]
           # Build mapping from filename to list of nodes which should have the file
           nodefiles = {}
           for (files, fn) in files2nodefn:
             if fn is None:
               filenodes = nodeinfo
             else:
               filenodes = filter(fn, nodeinfo)
             nodefiles.update((filename,
                               frozenset(map(operator.attrgetter("name"), filenodes)))
                              for filename in files)
           assert set(nodefiles) == (files_all | files_mc | files_vm)
           fileinfo = dict((filename, {}) for filename in nodefiles)
           ignore_nodes = set()
           for node in nodeinfo:
             if node.offline:
               ignore_nodes.add(node.name)
               continue
             nresult = all_nvinfo[node.name]
             if nresult.fail_msg or not nresult.payload:
               node_files = None
             else:
               node_files = nresult.payload.get(constants.NV_FILELIST, None)
             test = not (node_files and isinstance(node_files, dict))
             errorif(test, constants.CV_ENODEFILECHECK, node.name,
                     "Node did not return file checksum data")
             if test:
               ignore_nodes.add(node.name)
               continue
             # Build per-checksum mapping from filename to nodes having it
             for (filename, checksum) in node_files.items():
               assert filename in nodefiles
               fileinfo[filename].setdefault(checksum, set()).add(node.name)
           for (filename, checksums) in fileinfo.items():
             assert compat.all(len(i) > 10 for i in checksums), "Invalid checksum"
             # Nodes having the file
             with_file = frozenset(node_name
                                   for nodes in fileinfo[filename].values()
                                   for node_name in nodes) - ignore_nodes
             expected_nodes = nodefiles[filename] - ignore_nodes
             # Nodes missing file
             missing_file = expected_nodes - with_file
             if filename in files_opt:
               # All or no nodes
               errorif(missing_file and missing_file != expected_nodes,
                       constants.CV_ECLUSTERFILECHECK, None,
                       "File %s is optional, but it must exist on all or no"
                       " nodes (not found on %s)",
                       filename, utils.CommaJoin(utils.NiceSort(missing_file)))
             else:
               errorif(missing_file, constants.CV_ECLUSTERFILECHECK, None,
                       "File %s is missing from node(s) %s", filename,
                       utils.CommaJoin(utils.NiceSort(missing_file)))
               # Warn if a node has a file it shouldn't
               unexpected = with_file - expected_nodes
               errorif(unexpected,
                       constants.CV_ECLUSTERFILECHECK, None,
                       "File %s should not exist on node(s) %s",
                       filename, utils.CommaJoin(utils.NiceSort(unexpected)))
             # See if there are multiple versions of the file
             test = len(checksums) > 1
             if test:
               variants = ["variant %s on %s" %
                           (idx + 1, utils.CommaJoin(utils.NiceSort(nodes)))
                           for (idx, (checksum, nodes)) in
                             enumerate(sorted(checksums.items()))]
             else:
               variants = []
             errorif(test, constants.CV_ECLUSTERFILECHECK, None,
                     "File %s found with %s different checksums (%s)",
                     filename, len(checksums), "; ".join(variants))
         def _VerifyNodeDrbd(self, ninfo, nresult, instanceinfo, drbd_helper,
                             drbd_map):
           """Verifies and the node DRBD status.
           @type ninfo: L{objects.Node}
           @param ninfo: the node to check
           @param nresult: the remote results for the node
           @param instanceinfo: the dict of instances
           @param drbd_helper: the configured DRBD usermode helper
           @param drbd_map: the DRBD map as returned by
               L{ganeti.config.ConfigWriter.ComputeDRBDMap}
           """
           node = ninfo.name
           _ErrorIf = self._ErrorIf # pylint: disable=C0103
           if drbd_helper:
             helper_result = nresult.get(constants.NV_DRBDHELPER, None)
             test = (helper_result == None)
             _ErrorIf(test, constants.CV_ENODEDRBDHELPER, node,
                      "no drbd usermode helper returned")
             if helper_result:
               status, payload = helper_result
               test = not status
               _ErrorIf(test, constants.CV_ENODEDRBDHELPER, node,
                        "drbd usermode helper check unsuccessful: %s", payload)
               test = status and (payload != drbd_helper)
               _ErrorIf(test, constants.CV_ENODEDRBDHELPER, node,
                        "wrong drbd usermode helper: %s", payload)
           # compute the DRBD minors
           node_drbd = {}
           for minor, instance in drbd_map[node].items():
             test = instance not in instanceinfo
             _ErrorIf(test, constants.CV_ECLUSTERCFG, None,
                      "ghost instance '%s' in temporary DRBD map", instance)
               # ghost instance should not be running, but otherwise we
               # don't give double warnings (both ghost instance and
               # unallocated minor in use)
             if test:
               node_drbd[minor] = (instance, False)
             else:
               instance = instanceinfo[instance]
               node_drbd[minor] = (instance.name,
                                   instance.admin_state == constants.ADMINST_UP)
           # and now check them
           used_minors = nresult.get(constants.NV_DRBDLIST, [])
           test = not isinstance(used_minors, (tuple, list))
           _ErrorIf(test, constants.CV_ENODEDRBD, node,
                    "cannot parse drbd status file: %s", str(used_minors))
           if test:
             # we cannot check drbd status
             return
           for minor, (iname, must_exist) in node_drbd.items():
             test = minor not in used_minors and must_exist
             _ErrorIf(test, constants.CV_ENODEDRBD, node,
                      "drbd minor %d of instance %s is not active", minor, iname)
           for minor in used_minors:
             test = minor not in node_drbd
             _ErrorIf(test, constants.CV_ENODEDRBD, node,
                      "unallocated drbd minor %d is in use", minor)
         def _UpdateNodeOS(self, ninfo, nresult, nimg):
           """Builds the node OS structures.
           @type ninfo: L{objects.Node}
           @param ninfo: the node to check
           @param nresult: the remote results for the node
           @param nimg: the node image object
           """
           node = ninfo.name
           _ErrorIf = self._ErrorIf # pylint: disable=C0103
           remote_os = nresult.get(constants.NV_OSLIST, None)
           test = (not isinstance(remote_os, list) or
                   not compat.all(isinstance(v, list) and len(v) == 7
                                  for v in remote_os))
           _ErrorIf(test, constants.CV_ENODEOS, node,
                    "node hasn't returned valid OS data")
           nimg.os_fail = test
           if test:
             return
           os_dict = {}
           for (name, os_path, status, diagnose,
                variants, parameters, api_ver) in nresult[constants.NV_OSLIST]:
             if name not in os_dict:
               os_dict[name] = []
             # parameters is a list of lists instead of list of tuples due to
             # JSON lacking a real tuple type, fix it:
             parameters = [tuple(v) for v in parameters]
             os_dict[name].append((os_path, status, diagnose,
                                   set(variants), set(parameters), set(api_ver)))
           nimg.oslist = os_dict
         def _VerifyNodeOS(self, ninfo, nimg, base):
           """Verifies the node OS list.
           @type ninfo: L{objects.Node}
           @param ninfo: the node to check
           @param nimg: the node image object
           @param base: the 'template' node we match against (e.g. from the master)
           """
           node = ninfo.name
           _ErrorIf = self._ErrorIf # pylint: disable=C0103
           assert not nimg.os_fail, "Entered _VerifyNodeOS with failed OS rpc?"
           beautify_params = lambda l: ["%s: %s" % (k, v) for (k, v) in l]
           for os_name, os_data in nimg.oslist.items():
             assert os_data, "Empty OS status for OS %s?!" % os_name
             f_path, f_status, f_diag, f_var, f_param, f_api = os_data[0]
             _ErrorIf(not f_status, constants.CV_ENODEOS, node,
                      "Invalid OS %s (located at %s): %s", os_name, f_path, f_diag)
             _ErrorIf(len(os_data) > 1, constants.CV_ENODEOS, node,
                      "OS '%s' has multiple entries (first one shadows the rest): %s",
                      os_name, utils.CommaJoin([v[0] for v in os_data]))
             # comparisons with the 'base' image
             test = os_name not in base.oslist
             _ErrorIf(test, constants.CV_ENODEOS, node,
                      "Extra OS %s not present on reference node (%s)",
                      os_name, base.name)
             if test:
               continue
             assert base.oslist[os_name], "Base node has empty OS status?"
             _, b_status, _, b_var, b_param, b_api = base.oslist[os_name][0]
             if not b_status:
               # base OS is invalid, skipping
               continue
             for kind, a, b in [("API version", f_api, b_api),
                                ("variants list", f_var, b_var),
                                ("parameters", beautify_params(f_param),
                                 beautify_params(b_param))]:
               _ErrorIf(a != b, constants.CV_ENODEOS, node,
                        "OS %s for %s differs from reference node %s: [%s] vs. [%s]",
                        kind, os_name, base.name,
                        utils.CommaJoin(sorted(a)), utils.CommaJoin(sorted(b)))
           # check any missing OSes
           missing = set(base.oslist.keys()).difference(nimg.oslist.keys())
           _ErrorIf(missing, constants.CV_ENODEOS, node,
                    "OSes present on reference node %s but missing on this node: %s",
                    base.name, utils.CommaJoin(missing))
         def _VerifyOob(self, ninfo, nresult):
           """Verifies out of band functionality of a node.
           @type ninfo: L{objects.Node}
           @param ninfo: the node to check
           @param nresult: the remote results for the node
           """
           node = ninfo.name
           # We just have to verify the paths on master and/or master candidates
           # as the oob helper is invoked on the master
           if ((ninfo.master_candidate or ninfo.master_capable) and
               constants.NV_OOB_PATHS in nresult):
             for path_result in nresult[constants.NV_OOB_PATHS]:
               self._ErrorIf(path_result, constants.CV_ENODEOOBPATH, node, path_result)
         def _UpdateNodeVolumes(self, ninfo, nresult, nimg, vg_name):
           """Verifies and updates the node volume data.
           This function will update a L{NodeImage}'s internal structures
           with data from the remote call.
           @type ninfo: L{objects.Node}
           @param ninfo: the node to check
           @param nresult: the remote results for the node
           @param nimg: the node image object
           @param vg_name: the configured VG name
           """
           node = ninfo.name
           _ErrorIf = self._ErrorIf # pylint: disable=C0103
           nimg.lvm_fail = True
           lvdata = nresult.get(constants.NV_LVLIST, "Missing LV data")
           if vg_name is None:
             pass
           elif isinstance(lvdata, basestring):
             _ErrorIf(True, constants.CV_ENODELVM, node, "LVM problem on node: %s",
                      utils.SafeEncode(lvdata))
           elif not isinstance(lvdata, dict):
             _ErrorIf(True, constants.CV_ENODELVM, node,
                      "rpc call to node failed (lvlist)")
           else:
             nimg.volumes = lvdata
             nimg.lvm_fail = False
         def _UpdateNodeInstances(self, ninfo, nresult, nimg):
           """Verifies and updates the node instance list.
           If the listing was successful, then updates this node's instance
           list. Otherwise, it marks the RPC call as failed for the instance
           list key.
           @type ninfo: L{objects.Node}
           @param ninfo: the node to check
           @param nresult: the remote results for the node
           @param nimg: the node image object
           """
           idata = nresult.get(constants.NV_INSTANCELIST, None)
           test = not isinstance(idata, list)
           self._ErrorIf(test, constants.CV_ENODEHV, ninfo.name,
                         "rpc call to node failed (instancelist): %s",
                         utils.SafeEncode(str(idata)))
           if test:
             nimg.hyp_fail = True
           else:
             nimg.instances = idata
         def _UpdateNodeInfo(self, ninfo, nresult, nimg, vg_name):
           """Verifies and computes a node information map
           @type ninfo: L{objects.Node}
           @param ninfo: the node to check
           @param nresult: the remote results for the node
           @param nimg: the node image object
           @param vg_name: the configured VG name
           """
           node = ninfo.name
           _ErrorIf = self._ErrorIf # pylint: disable=C0103
           # try to read free memory (from the hypervisor)
           hv_info = nresult.get(constants.NV_HVINFO, None)
           test = not isinstance(hv_info, dict) or "memory_free" not in hv_info
           _ErrorIf(test, constants.CV_ENODEHV, node,
                    "rpc call to node failed (hvinfo)")
           if not test:
             try:
               nimg.mfree = int(hv_info["memory_free"])
             except (ValueError, TypeError):
               _ErrorIf(True, constants.CV_ENODERPC, node,
                        "node returned invalid nodeinfo, check hypervisor")
           # FIXME: devise a free space model for file based instances as well
           if vg_name is not None:
             test = (constants.NV_VGLIST not in nresult or
                     vg_name not in nresult[constants.NV_VGLIST])
             _ErrorIf(test, constants.CV_ENODELVM, node,
                      "node didn't return data for the volume group '%s'"
                      " - it is either missing or broken", vg_name)
             if not test:
               try:
                 nimg.dfree = int(nresult[constants.NV_VGLIST][vg_name])
               except (ValueError, TypeError):
                 _ErrorIf(True, constants.CV_ENODERPC, node,
                          "node returned invalid LVM info, check LVM status")
         def _CollectDiskInfo(self, nodelist, node_image, instanceinfo):
           """Gets per-disk status information for all instances.
           @type nodelist: list of strings
           @param nodelist: Node names
           @type node_image: dict of (name, L{objects.Node})
           @param node_image: Node objects
           @type instanceinfo: dict of (name, L{objects.Instance})
           @param instanceinfo: Instance objects
           @rtype: {instance: {node: [(succes, payload)]}}
           @return: a dictionary of per-instance dictionaries with nodes as
               keys and disk information as values; the disk information is a
               list of tuples (success, payload)
           """
           _ErrorIf = self._ErrorIf # pylint: disable=C0103
           node_disks = {}
           node_disks_devonly = {}
           diskless_instances = set()
           diskless = constants.DT_DISKLESS
           for nname in nodelist:
             node_instances = list(itertools.chain(node_image[nname].pinst,
                                                   node_image[nname].sinst))
             diskless_instances.update(inst for inst in node_instances
                                       if instanceinfo[inst].disk_template == diskless)
             disks = [(inst, disk)
                      for inst in node_instances
                      for disk in instanceinfo[inst].disks]
             if not disks:
               # No need to collect data
               continue
             node_disks[nname] = disks
             # Creating copies as SetDiskID below will modify the objects and that can
             # lead to incorrect data returned from nodes
             devonly = [dev.Copy() for (_, dev) in disks]
             for dev in devonly:
               self.cfg.SetDiskID(dev, nname)
             node_disks_devonly[nname] = devonly
           assert len(node_disks) == len(node_disks_devonly)
           # Collect data from all nodes with disks
           result = self.rpc.call_blockdev_getmirrorstatus_multi(node_disks.keys(),
                                                                 node_disks_devonly)
           assert len(result) == len(node_disks)
           instdisk = {}
           for (nname, nres) in result.items():
             disks = node_disks[nname]
             if nres.offline:
               # No data from this node
               data = len(disks) * [(False, "node offline")]
             else:
               msg = nres.fail_msg
               _ErrorIf(msg, constants.CV_ENODERPC, nname,
                        "while getting disk information: %s", msg)
               if msg:
                 # No data from this node
                 data = len(disks) * [(False, msg)]
               else:
                 data = []
                 for idx, i in enumerate(nres.payload):
                   if isinstance(i, (tuple, list)) and len(i) == 2:
                     data.append(i)
                   else:
                     logging.warning("Invalid result from node %s, entry %d: %s",
                                     nname, idx, i)
                     data.append((False, "Invalid result from the remote node"))
             for ((inst, _), status) in zip(disks, data):
               instdisk.setdefault(inst, {}).setdefault(nname, []).append(status)
           # Add empty entries for diskless instances.
           for inst in diskless_instances:
             assert inst not in instdisk
             instdisk[inst] = {}
           assert compat.all(len(statuses) == len(instanceinfo[inst].disks) and
                             len(nnames) <= len(instanceinfo[inst].all_nodes) and
                             compat.all(isinstance(s, (tuple, list)) and
                                        len(s) == 2 for s in statuses)
                             for inst, nnames in instdisk.items()
                             for nname, statuses in nnames.items())
           assert set(instdisk) == set(instanceinfo), "instdisk consistency failure"
           return instdisk
         @staticmethod
         def _SshNodeSelector(group_uuid, all_nodes):
           """Create endless iterators for all potential SSH check hosts.
           """
           nodes = [node for node in all_nodes
                    if (node.group != group_uuid and
                        not node.offline)]
           keyfunc = operator.attrgetter("group")
           return map(itertools.cycle,
                      [sorted(map(operator.attrgetter("name"), names))
                       for _, names in itertools.groupby(sorted(nodes, key=keyfunc),
                                                         keyfunc)])
         @classmethod
         def _SelectSshCheckNodes(cls, group_nodes, group_uuid, all_nodes):
           """Choose which nodes should talk to which other nodes.
           We will make nodes contact all nodes in their group, and one node from
           every other group.
           @warning: This algorithm has a known issue if one node group is much
             smaller than others (e.g. just one node). In such a case all other
             nodes will talk to the single node.
           """
           online_nodes = sorted(node.name for node in group_nodes if not node.offline)
           sel = cls._SshNodeSelector(group_uuid, all_nodes)
           return (online_nodes,
                   dict((name, sorted([i.next() for i in sel]))
                        for name in online_nodes))
         def BuildHooksEnv(self):
           """Build hooks env.
           Cluster-Verify hooks just ran in the post phase and their failure makes
           the output be logged in the verify output and the verification to fail.
           """
           env = {
             "CLUSTER_TAGS": " ".join(self.cfg.GetClusterInfo().GetTags())
+            }
           env.update(("NODE_TAGS_%s" % node.name, " ".join(node.GetTags()))
                      for node in self.my_node_info.values())
           return env
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           return ([], self.my_node_names)
         def Exec(self, feedback_fn):
           """Verify integrity of the node group, performing various test on nodes.
           """
           # This method has too many local variables. pylint: disable=R0914
           feedback_fn("* Verifying group '%s'" % self.group_info.name)
           if not self.my_node_names:
             # empty node group
             feedback_fn("* Empty node group, skipping verification")
             return True
           self.bad = False
           _ErrorIf = self._ErrorIf # pylint: disable=C0103
           verbose = self.op.verbose
           self._feedback_fn = feedback_fn
           vg_name = self.cfg.GetVGName()
           drbd_helper = self.cfg.GetDRBDHelper()
           cluster = self.cfg.GetClusterInfo()
           groupinfo = self.cfg.GetAllNodeGroupsInfo()
           hypervisors = cluster.enabled_hypervisors
           node_data_list = [self.my_node_info[name] for name in self.my_node_names]
           i_non_redundant = [] # Non redundant instances
           i_non_a_balanced = [] # Non auto-balanced instances
           i_offline = 0 # Count of offline instances
           n_offline = 0 # Count of offline nodes
           n_drained = 0 # Count of nodes being drained
           node_vol_should = {}
           # FIXME: verify OS list
           # File verification
           filemap = _ComputeAncillaryFiles(cluster, False)
           # do local checksums
           master_node = self.master_node = self.cfg.GetMasterNode()
           master_ip = self.cfg.GetMasterIP()
           feedback_fn("* Gathering data (%d nodes)" % len(self.my_node_names))
           user_scripts = []
           if self.cfg.GetUseExternalMipScript():
             user_scripts.append(constants.EXTERNAL_MASTER_SETUP_SCRIPT)
           node_verify_param = {
             constants.NV_FILELIST:
               utils.UniqueSequence(filename
                                    for files in filemap
                                    for filename in files),
             constants.NV_NODELIST:
               self._SelectSshCheckNodes(node_data_list, self.group_uuid,
                                         self.all_node_info.values()),
             constants.NV_HYPERVISOR: hypervisors,
             constants.NV_HVPARAMS:
               _GetAllHypervisorParameters(cluster, self.all_inst_info.values()),
             constants.NV_NODENETTEST: [(node.name, node.primary_ip, node.secondary_ip)
                                        for node in node_data_list
                                        if not node.offline],
             constants.NV_INSTANCELIST: hypervisors,
             constants.NV_VERSION: None,
             constants.NV_HVINFO: self.cfg.GetHypervisorType(),
             constants.NV_NODESETUP: None,
             constants.NV_TIME: None,
             constants.NV_MASTERIP: (master_node, master_ip),
             constants.NV_OSLIST: None,
             constants.NV_VMNODES: self.cfg.GetNonVmCapableNodeList(),
             constants.NV_USERSCRIPTS: user_scripts,
+            }
           if vg_name is not None:
             node_verify_param[constants.NV_VGLIST] = None
             node_verify_param[constants.NV_LVLIST] = vg_name
             node_verify_param[constants.NV_PVLIST] = [vg_name]
             node_verify_param[constants.NV_DRBDLIST] = None
           if drbd_helper:
             node_verify_param[constants.NV_DRBDHELPER] = drbd_helper
           # bridge checks
           # FIXME: this needs to be changed per node-group, not cluster-wide
           bridges = set()
           default_nicpp = cluster.nicparams[constants.PP_DEFAULT]
           if default_nicpp[constants.NIC_MODE] == constants.NIC_MODE_BRIDGED:
             bridges.add(default_nicpp[constants.NIC_LINK])
           for instance in self.my_inst_info.values():
             for nic in instance.nics:
               full_nic = cluster.SimpleFillNIC(nic.nicparams)
               if full_nic[constants.NIC_MODE] == constants.NIC_MODE_BRIDGED:
                 bridges.add(full_nic[constants.NIC_LINK])
           if bridges:
             node_verify_param[constants.NV_BRIDGES] = list(bridges)
           # Build our expected cluster state
           node_image = dict((node.name, self.NodeImage(offline=node.offline,
                                                        name=node.name,
                                                        vm_capable=node.vm_capable))
                             for node in node_data_list)
           # Gather OOB paths
           oob_paths = []
           for node in self.all_node_info.values():
             path = _SupportsOob(self.cfg, node)
             if path and path not in oob_paths:
               oob_paths.append(path)
           if oob_paths:
             node_verify_param[constants.NV_OOB_PATHS] = oob_paths
           for instance in self.my_inst_names:
             inst_config = self.my_inst_info[instance]
             for nname in inst_config.all_nodes:
               if nname not in node_image:
                 gnode = self.NodeImage(name=nname)
                 gnode.ghost = (nname not in self.all_node_info)
                 node_image[nname] = gnode
             inst_config.MapLVsByNode(node_vol_should)
             pnode = inst_config.primary_node
             node_image[pnode].pinst.append(instance)
             for snode in inst_config.secondary_nodes:
               nimg = node_image[snode]
               nimg.sinst.append(instance)
               if pnode not in nimg.sbp:
                 nimg.sbp[pnode] = []
               nimg.sbp[pnode].append(instance)
           # At this point, we have the in-memory data structures complete,
           # except for the runtime information, which we'll gather next
           # Due to the way our RPC system works, exact response times cannot be
           # guaranteed (e.g. a broken node could run into a timeout). By keeping the
           # time before and after executing the request, we can at least have a time
           # window.
           nvinfo_starttime = time.time()
           all_nvinfo = self.rpc.call_node_verify(self.my_node_names,
                                                  node_verify_param,
                                                  self.cfg.GetClusterName())
           nvinfo_endtime = time.time()
           if self.extra_lv_nodes and vg_name is not None:
             extra_lv_nvinfo = \
                 self.rpc.call_node_verify(self.extra_lv_nodes,
                                           {constants.NV_LVLIST: vg_name},
                                           self.cfg.GetClusterName())
           else:
             extra_lv_nvinfo = {}
           all_drbd_map = self.cfg.ComputeDRBDMap()
           feedback_fn("* Gathering disk information (%s nodes)" %
                       len(self.my_node_names))
           instdisk = self._CollectDiskInfo(self.my_node_names, node_image,
                                            self.my_inst_info)
           feedback_fn("* Verifying configuration file consistency")
           # If not all nodes are being checked, we need to make sure the master node
           # and a non-checked vm_capable node are in the list.
           absent_nodes = set(self.all_node_info).difference(self.my_node_info)
           if absent_nodes:
             vf_nvinfo = all_nvinfo.copy()
             vf_node_info = list(self.my_node_info.values())
             additional_nodes = []
             if master_node not in self.my_node_info:
               additional_nodes.append(master_node)
               vf_node_info.append(self.all_node_info[master_node])
             # Add the first vm_capable node we find which is not included
             for node in absent_nodes:
               nodeinfo = self.all_node_info[node]
               if nodeinfo.vm_capable and not nodeinfo.offline:
                 additional_nodes.append(node)
                 vf_node_info.append(self.all_node_info[node])
                 break
             key = constants.NV_FILELIST
             vf_nvinfo.update(self.rpc.call_node_verify(additional_nodes,
                                                        {key: node_verify_param[key]},
                                                        self.cfg.GetClusterName()))
           else:
             vf_nvinfo = all_nvinfo
             vf_node_info = self.my_node_info.values()
           self._VerifyFiles(_ErrorIf, vf_node_info, master_node, vf_nvinfo, filemap)
           feedback_fn("* Verifying node status")
           refos_img = None
           for node_i in node_data_list:
             node = node_i.name
             nimg = node_image[node]
             if node_i.offline:
               if verbose:
                 feedback_fn("* Skipping offline node %s" % (node,))
               n_offline += 1
               continue
             if node == master_node:
               ntype = "master"
             elif node_i.master_candidate:
               ntype = "master candidate"
             elif node_i.drained:
               ntype = "drained"
               n_drained += 1
             else:
               ntype = "regular"
             if verbose:
               feedback_fn("* Verifying node %s (%s)" % (node, ntype))
             msg = all_nvinfo[node].fail_msg
             _ErrorIf(msg, constants.CV_ENODERPC, node, "while contacting node: %s",
                      msg)
             if msg:
               nimg.rpc_fail = True
               continue
             nresult = all_nvinfo[node].payload
             nimg.call_ok = self._VerifyNode(node_i, nresult)
             self._VerifyNodeTime(node_i, nresult, nvinfo_starttime, nvinfo_endtime)
             self._VerifyNodeNetwork(node_i, nresult)
             self._VerifyNodeUserScripts(node_i, nresult)
             self._VerifyOob(node_i, nresult)
             if nimg.vm_capable:
               self._VerifyNodeLVM(node_i, nresult, vg_name)
               self._VerifyNodeDrbd(node_i, nresult, self.all_inst_info, drbd_helper,
                                    all_drbd_map)
               self._UpdateNodeVolumes(node_i, nresult, nimg, vg_name)
               self._UpdateNodeInstances(node_i, nresult, nimg)
               self._UpdateNodeInfo(node_i, nresult, nimg, vg_name)
               self._UpdateNodeOS(node_i, nresult, nimg)
               if not nimg.os_fail:
                 if refos_img is None:
                   refos_img = nimg
                 self._VerifyNodeOS(node_i, nimg, refos_img)
               self._VerifyNodeBridges(node_i, nresult, bridges)
               # Check whether all running instancies are primary for the node. (This
               # can no longer be done from _VerifyInstance below, since some of the
               # wrong instances could be from other node groups.)
               non_primary_inst = set(nimg.instances).difference(nimg.pinst)
               for inst in non_primary_inst:
                 # FIXME: investigate best way to handle offline insts
                 if inst.admin_state == constants.ADMINST_OFFLINE:
                   if verbose:
                     feedback_fn("* Skipping offline instance %s" % inst.name)
                   i_offline += 1
                   continue
                 test = inst in self.all_inst_info
                 _ErrorIf(test, constants.CV_EINSTANCEWRONGNODE, inst,
                          "instance should not run on node %s", node_i.name)
                 _ErrorIf(not test, constants.CV_ENODEORPHANINSTANCE, node_i.name,
                          "node is running unknown instance %s", inst)
           for node, result in extra_lv_nvinfo.items():
             self._UpdateNodeVolumes(self.all_node_info[node], result.payload,
                                     node_image[node], vg_name)
           feedback_fn("* Verifying instance status")
           for instance in self.my_inst_names:
             if verbose:
               feedback_fn("* Verifying instance %s" % instance)
             inst_config = self.my_inst_info[instance]
             self._VerifyInstance(instance, inst_config, node_image,
                                  instdisk[instance])
             inst_nodes_offline = []
             pnode = inst_config.primary_node
             pnode_img = node_image[pnode]
             _ErrorIf(pnode_img.rpc_fail and not pnode_img.offline,
                      constants.CV_ENODERPC, pnode, "instance %s, connection to"
                      " primary node failed", instance)
             _ErrorIf(inst_config.admin_state == constants.ADMINST_UP and
                      pnode_img.offline,
                      constants.CV_EINSTANCEBADNODE, instance,
                      "instance is marked as running and lives on offline node %s",
                      inst_config.primary_node)
             # If the instance is non-redundant we cannot survive losing its primary
             # node, so we are not N+1 compliant. On the other hand we have no disk
             # templates with more than one secondary so that situation is not well
             # supported either.
             # FIXME: does not support file-backed instances
             if not inst_config.secondary_nodes:
               i_non_redundant.append(instance)
             _ErrorIf(len(inst_config.secondary_nodes) > 1,
                      constants.CV_EINSTANCELAYOUT,
                      instance, "instance has multiple secondary nodes: %s",
                      utils.CommaJoin(inst_config.secondary_nodes),
                      code=self.ETYPE_WARNING)
             if inst_config.disk_template in constants.DTS_INT_MIRROR:
               pnode = inst_config.primary_node
               instance_nodes = utils.NiceSort(inst_config.all_nodes)
               instance_groups = {}
               for node in instance_nodes:
                 instance_groups.setdefault(self.all_node_info[node].group,
                                            []).append(node)
               pretty_list = [
                 "%s (group %s)" % (utils.CommaJoin(nodes), groupinfo[group].name)
                 # Sort so that we always list the primary node first.
                 for group, nodes in sorted(instance_groups.items(),
                                            key=lambda (_, nodes): pnode in nodes,
                                            reverse=True)]
               self._ErrorIf(len(instance_groups) > 1,
                             constants.CV_EINSTANCESPLITGROUPS,
                             instance, "instance has primary and secondary nodes in"
                             " different groups: %s", utils.CommaJoin(pretty_list),
                             code=self.ETYPE_WARNING)
             if not cluster.FillBE(inst_config)[constants.BE_AUTO_BALANCE]:
               i_non_a_balanced.append(instance)
             for snode in inst_config.secondary_nodes:
               s_img = node_image[snode]
               _ErrorIf(s_img.rpc_fail and not s_img.offline, constants.CV_ENODERPC,
                        snode, "instance %s, connection to secondary node failed",
                        instance)
               if s_img.offline:
                 inst_nodes_offline.append(snode)
             # warn that the instance lives on offline nodes
             _ErrorIf(inst_nodes_offline, constants.CV_EINSTANCEBADNODE, instance,
                      "instance has offline secondary node(s) %s",
                      utils.CommaJoin(inst_nodes_offline))
             # ... or ghost/non-vm_capable nodes
             for node in inst_config.all_nodes:
               _ErrorIf(node_image[node].ghost, constants.CV_EINSTANCEBADNODE,
                        instance, "instance lives on ghost node %s", node)
               _ErrorIf(not node_image[node].vm_capable, constants.CV_EINSTANCEBADNODE,
                        instance, "instance lives on non-vm_capable node %s", node)
           feedback_fn("* Verifying orphan volumes")
           reserved = utils.FieldSet(*cluster.reserved_lvs)
           # We will get spurious "unknown volume" warnings if any node of this group
           # is secondary for an instance whose primary is in another group. To avoid
           # them, we find these instances and add their volumes to node_vol_should.
           for inst in self.all_inst_info.values():
             for secondary in inst.secondary_nodes:
               if (secondary in self.my_node_info
                   and inst.name not in self.my_inst_info):
                 inst.MapLVsByNode(node_vol_should)
                 break
           self._VerifyOrphanVolumes(node_vol_should, node_image, reserved)
           if constants.VERIFY_NPLUSONE_MEM not in self.op.skip_checks:
             feedback_fn("* Verifying N+1 Memory redundancy")
             self._VerifyNPlusOneMemory(node_image, self.my_inst_info)
           feedback_fn("* Other Notes")
           if i_non_redundant:
             feedback_fn("  - NOTICE: %d non-redundant instance(s) found."
                         % len(i_non_redundant))
           if i_non_a_balanced:
             feedback_fn("  - NOTICE: %d non-auto-balanced instance(s) found."
                         % len(i_non_a_balanced))
           if i_offline:
             feedback_fn("  - NOTICE: %d offline instance(s) found." % i_offline)
           if n_offline:
             feedback_fn("  - NOTICE: %d offline node(s) found." % n_offline)
           if n_drained:
             feedback_fn("  - NOTICE: %d drained node(s) found." % n_drained)
           return not self.bad
         def HooksCallBack(self, phase, hooks_results, feedback_fn, lu_result):
           """Analyze the post-hooks' result
           This method analyses the hook result, handles it, and sends some
           nicely-formatted feedback back to the user.
           @param phase: one of L{constants.HOOKS_PHASE_POST} or
               L{constants.HOOKS_PHASE_PRE}; it denotes the hooks phase
           @param hooks_results: the results of the multi-node hooks rpc call
           @param feedback_fn: function used send feedback back to the caller
           @param lu_result: previous Exec result
           @return: the new Exec result, based on the previous result
               and hook results
           """
           # We only really run POST phase hooks, only for non-empty groups,
           # and are only interested in their results
           if not self.my_node_names:
             # empty node group
             pass
           elif phase == constants.HOOKS_PHASE_POST:
             # Used to change hooks' output to proper indentation
             feedback_fn("* Hooks Results")
             assert hooks_results, "invalid result from hooks"
             for node_name in hooks_results:
               res = hooks_results[node_name]
               msg = res.fail_msg
               test = msg and not res.offline
               self._ErrorIf(test, constants.CV_ENODEHOOKS, node_name,
                             "Communication failure in hooks execution: %s", msg)
               if res.offline or msg:
                 # No need to investigate payload if node is offline or gave
                 # an error.
                 continue
               for script, hkr, output in res.payload:
                 test = hkr == constants.HKR_FAIL
                 self._ErrorIf(test, constants.CV_ENODEHOOKS, node_name,
                               "Script %s failed, output:", script)
                 if test:
                   output = self._HOOKS_INDENT_RE.sub("      ", output)
                   feedback_fn("%s" % output)
                   lu_result = False
           return lu_result
       class LUClusterVerifyDisks(NoHooksLU):
         """Verifies the cluster disks status.
         """
         REQ_BGL = False
         def ExpandNames(self):
           self.share_locks = _ShareAll()
           self.needed_locks = {
             locking.LEVEL_NODEGROUP: locking.ALL_SET,
+            }
         def Exec(self, feedback_fn):
           group_names = self.owned_locks(locking.LEVEL_NODEGROUP)
           # Submit one instance of L{opcodes.OpGroupVerifyDisks} per node group
           return ResultWithJobs([[opcodes.OpGroupVerifyDisks(group_name=group)]
                                  for group in group_names])
       class LUGroupVerifyDisks(NoHooksLU):
         """Verifies the status of all disks in a node group.
         """
         REQ_BGL = False
         def ExpandNames(self):
           # Raises errors.OpPrereqError on its own if group can't be found
           self.group_uuid = self.cfg.LookupNodeGroup(self.op.group_name)
           self.share_locks = _ShareAll()
           self.needed_locks = {
             locking.LEVEL_INSTANCE: [],
             locking.LEVEL_NODEGROUP: [],
             locking.LEVEL_NODE: [],
+            }
         def DeclareLocks(self, level):
           if level == locking.LEVEL_INSTANCE:
             assert not self.needed_locks[locking.LEVEL_INSTANCE]
             # Lock instances optimistically, needs verification once node and group
             # locks have been acquired
             self.needed_locks[locking.LEVEL_INSTANCE] = \
               self.cfg.GetNodeGroupInstances(self.group_uuid)
           elif level == locking.LEVEL_NODEGROUP:
             assert not self.needed_locks[locking.LEVEL_NODEGROUP]
             self.needed_locks[locking.LEVEL_NODEGROUP] = \
               set([self.group_uuid] +
                   # Lock all groups used by instances optimistically; this requires
                   # going via the node before it's locked, requiring verification
                   # later on
                   [group_uuid
                    for instance_name in self.owned_locks(locking.LEVEL_INSTANCE)
                    for group_uuid in self.cfg.GetInstanceNodeGroups(instance_name)])
           elif level == locking.LEVEL_NODE:
             # This will only lock the nodes in the group to be verified which contain
             # actual instances
             self.recalculate_locks[locking.LEVEL_NODE] = constants.LOCKS_APPEND
             self._LockInstancesNodes()
             # Lock all nodes in group to be verified
             assert self.group_uuid in self.owned_locks(locking.LEVEL_NODEGROUP)
             member_nodes = self.cfg.GetNodeGroup(self.group_uuid).members
             self.needed_locks[locking.LEVEL_NODE].extend(member_nodes)
         def CheckPrereq(self):
           owned_instances = frozenset(self.owned_locks(locking.LEVEL_INSTANCE))
           owned_groups = frozenset(self.owned_locks(locking.LEVEL_NODEGROUP))
           owned_nodes = frozenset(self.owned_locks(locking.LEVEL_NODE))
           assert self.group_uuid in owned_groups
           # Check if locked instances are still correct
           _CheckNodeGroupInstances(self.cfg, self.group_uuid, owned_instances)
           # Get instance information
           self.instances = dict(self.cfg.GetMultiInstanceInfo(owned_instances))
           # Check if node groups for locked instances are still correct
           for (instance_name, inst) in self.instances.items():
             assert owned_nodes.issuperset(inst.all_nodes), \
               "Instance %s's nodes changed while we kept the lock" % instance_name
             inst_groups = _CheckInstanceNodeGroups(self.cfg, instance_name,
                                                    owned_groups)
             assert self.group_uuid in inst_groups, \
               "Instance %s has no node in group %s" % (instance_name, self.group_uuid)
         def Exec(self, feedback_fn):
           """Verify integrity of cluster disks.
           @rtype: tuple of three items
           @return: a tuple of (dict of node-to-node_error, list of instances
               which need activate-disks, dict of instance: (node, volume) for
               missing volumes
           """
           res_nodes = {}
           res_instances = set()
           res_missing = {}
           nv_dict = _MapInstanceDisksToNodes([inst
                   for inst in self.instances.values()
                   if inst.admin_state == constants.ADMINST_UP])
           if nv_dict:
             nodes = utils.NiceSort(set(self.owned_locks(locking.LEVEL_NODE)) &
                                    set(self.cfg.GetVmCapableNodeList()))
             node_lvs = self.rpc.call_lv_list(nodes, [])
             for (node, node_res) in node_lvs.items():
               if node_res.offline:
                 continue
               msg = node_res.fail_msg
               if msg:
                 logging.warning("Error enumerating LVs on node %s: %s", node, msg)
                 res_nodes[node] = msg
                 continue
               for lv_name, (_, _, lv_online) in node_res.payload.items():
                 inst = nv_dict.pop((node, lv_name), None)
                 if not (lv_online or inst is None):
                   res_instances.add(inst)
             # any leftover items in nv_dict are missing LVs, let's arrange the data
             # better
             for key, inst in nv_dict.iteritems():
               res_missing.setdefault(inst, []).append(list(key))
           return (res_nodes, list(res_instances), res_missing)
       class LUClusterRepairDiskSizes(NoHooksLU):
         """Verifies the cluster disks sizes.
         """
         REQ_BGL = False
         def ExpandNames(self):
           if self.op.instances:
             self.wanted_names = _GetWantedInstances(self, self.op.instances)
             self.needed_locks = {
               locking.LEVEL_NODE_RES: [],
               locking.LEVEL_INSTANCE: self.wanted_names,
+              }
             self.recalculate_locks[locking.LEVEL_NODE_RES] = constants.LOCKS_REPLACE
           else:
             self.wanted_names = None
             self.needed_locks = {
               locking.LEVEL_NODE_RES: locking.ALL_SET,
               locking.LEVEL_INSTANCE: locking.ALL_SET,
+              }
           self.share_locks = {
             locking.LEVEL_NODE_RES: 1,
             locking.LEVEL_INSTANCE: 0,
+            }
         def DeclareLocks(self, level):
           if level == locking.LEVEL_NODE_RES and self.wanted_names is not None:
             self._LockInstancesNodes(primary_only=True, level=level)
         def CheckPrereq(self):
           """Check prerequisites.
           This only checks the optional instance list against the existing names.
           """
           if self.wanted_names is None:
             self.wanted_names = self.owned_locks(locking.LEVEL_INSTANCE)
           self.wanted_instances = \
               map(compat.snd, self.cfg.GetMultiInstanceInfo(self.wanted_names))
         def _EnsureChildSizes(self, disk):
           """Ensure children of the disk have the needed disk size.
           This is valid mainly for DRBD8 and fixes an issue where the
           children have smaller disk size.
           @param disk: an L{ganeti.objects.Disk} object
           """
           if disk.dev_type == constants.LD_DRBD8:
             assert disk.children, "Empty children for DRBD8?"
             fchild = disk.children[0]
             mismatch = fchild.size < disk.size
             if mismatch:
               self.LogInfo("Child disk has size %d, parent %d, fixing",
                            fchild.size, disk.size)
               fchild.size = disk.size
             # and we recurse on this child only, not on the metadev
             return self._EnsureChildSizes(fchild) or mismatch
           else:
             return False
         def Exec(self, feedback_fn):
           """Verify the size of cluster disks.
           """
           # TODO: check child disks too
           # TODO: check differences in size between primary/secondary nodes
           per_node_disks = {}
           for instance in self.wanted_instances:
             pnode = instance.primary_node
             if pnode not in per_node_disks:
               per_node_disks[pnode] = []
             for idx, disk in enumerate(instance.disks):
               per_node_disks[pnode].append((instance, idx, disk))
           assert not (frozenset(per_node_disks.keys()) -
                       self.owned_locks(locking.LEVEL_NODE_RES)), \
             "Not owning correct locks"
           assert not self.owned_locks(locking.LEVEL_NODE)
           changed = []
           for node, dskl in per_node_disks.items():
             newl = [v[2].Copy() for v in dskl]
             for dsk in newl:
               self.cfg.SetDiskID(dsk, node)
             result = self.rpc.call_blockdev_getsize(node, newl)
             if result.fail_msg:
               self.LogWarning("Failure in blockdev_getsize call to node"
                               " %s, ignoring", node)
               continue
             if len(result.payload) != len(dskl):
               logging.warning("Invalid result from node %s: len(dksl)=%d,"
                               " result.payload=%s", node, len(dskl), result.payload)
               self.LogWarning("Invalid result from node %s, ignoring node results",
                               node)
               continue
             for ((instance, idx, disk), size) in zip(dskl, result.payload):
               if size is None:
                 self.LogWarning("Disk %d of instance %s did not return size"
                                 " information, ignoring", idx, instance.name)
                 continue
               if not isinstance(size, (int, long)):
                 self.LogWarning("Disk %d of instance %s did not return valid"
                                 " size information, ignoring", idx, instance.name)
                 continue
               size = size >> 20
               if size != disk.size:
                 self.LogInfo("Disk %d of instance %s has mismatched size,"
                              " correcting: recorded %d, actual %d", idx,
                              instance.name, disk.size, size)
                 disk.size = size
                 self.cfg.Update(instance, feedback_fn)
                 changed.append((instance.name, idx, size))
               if self._EnsureChildSizes(disk):
                 self.cfg.Update(instance, feedback_fn)
                 changed.append((instance.name, idx, disk.size))
           return changed
       class LUClusterRename(LogicalUnit):
         """Rename the cluster.
         """
         HPATH = "cluster-rename"
         HTYPE = constants.HTYPE_CLUSTER
         def BuildHooksEnv(self):
           """Build hooks env.
           """
           return {
             "OP_TARGET": self.cfg.GetClusterName(),
             "NEW_NAME": self.op.name,
+            }
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           return ([self.cfg.GetMasterNode()], self.cfg.GetNodeList())
         def CheckPrereq(self):
           """Verify that the passed name is a valid one.
           """
           hostname = netutils.GetHostname(name=self.op.name,
                                           family=self.cfg.GetPrimaryIPFamily())
           new_name = hostname.name
           self.ip = new_ip = hostname.ip
           old_name = self.cfg.GetClusterName()
           old_ip = self.cfg.GetMasterIP()
           if new_name == old_name and new_ip == old_ip:
             raise errors.OpPrereqError("Neither the name nor the IP address of the"
                                        " cluster has changed",
                                        errors.ECODE_INVAL)
           if new_ip != old_ip:
             if netutils.TcpPing(new_ip, constants.DEFAULT_NODED_PORT):
               raise errors.OpPrereqError("The given cluster IP address (%s) is"
                                          " reachable on the network" %
                                          new_ip, errors.ECODE_NOTUNIQUE)
           self.op.name = new_name
         def Exec(self, feedback_fn):
           """Rename the cluster.
           """
           clustername = self.op.name
           new_ip = self.ip
           # shutdown the master IP
           master_params = self.cfg.GetMasterNetworkParameters()
           ems = self.cfg.GetUseExternalMipScript()
           result = self.rpc.call_node_deactivate_master_ip(master_params.name,
                                                            master_params, ems)
           result.Raise("Could not disable the master role")
           try:
             cluster = self.cfg.GetClusterInfo()
             cluster.cluster_name = clustername
             cluster.master_ip = new_ip
             self.cfg.Update(cluster, feedback_fn)
             # update the known hosts file
             ssh.WriteKnownHostsFile(self.cfg, constants.SSH_KNOWN_HOSTS_FILE)
             node_list = self.cfg.GetOnlineNodeList()
             try:
               node_list.remove(master_params.name)
             except ValueError:
               pass
             _UploadHelper(self, node_list, constants.SSH_KNOWN_HOSTS_FILE)
           finally:
             master_params.ip = new_ip
             result = self.rpc.call_node_activate_master_ip(master_params.name,
                                                            master_params, ems)
             msg = result.fail_msg
             if msg:
               self.LogWarning("Could not re-enable the master role on"
                               " the master, please restart manually: %s", msg)
           return clustername
       def _ValidateNetmask(cfg, netmask):
         """Checks if a netmask is valid.
         @type cfg: L{config.ConfigWriter}
         @param cfg: The cluster configuration
         @type netmask: int
         @param netmask: the netmask to be verified
         @raise errors.OpPrereqError: if the validation fails
         """
         ip_family = cfg.GetPrimaryIPFamily()
         try:
           ipcls = netutils.IPAddress.GetClassFromIpFamily(ip_family)
         except errors.ProgrammerError:
           raise errors.OpPrereqError("Invalid primary ip family: %s." %
                                      ip_family)
         if not ipcls.ValidateNetmask(netmask):
           raise errors.OpPrereqError("CIDR netmask (%s) not valid" %
                                       (netmask))
       class LUClusterSetParams(LogicalUnit):
         """Change the parameters of the cluster.
         """
         HPATH = "cluster-modify"
         HTYPE = constants.HTYPE_CLUSTER
         REQ_BGL = False
         def CheckArguments(self):
           """Check parameters
           """
           if self.op.uid_pool:
             uidpool.CheckUidPool(self.op.uid_pool)
           if self.op.add_uids:
             uidpool.CheckUidPool(self.op.add_uids)
           if self.op.remove_uids:
             uidpool.CheckUidPool(self.op.remove_uids)
           if self.op.master_netmask is not None:
             _ValidateNetmask(self.cfg, self.op.master_netmask)
           if self.op.diskparams:
             for dt_params in self.op.diskparams.values():
               utils.ForceDictType(dt_params, constants.DISK_DT_TYPES)
         def ExpandNames(self):
           # FIXME: in the future maybe other cluster params won't require checking on
           # all nodes to be modified.
           self.needed_locks = {
             locking.LEVEL_NODE: locking.ALL_SET,
+          }
           self.share_locks[locking.LEVEL_NODE] = 1
         def BuildHooksEnv(self):
           """Build hooks env.
           """
           return {
             "OP_TARGET": self.cfg.GetClusterName(),
             "NEW_VG_NAME": self.op.vg_name,
+            }
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           mn = self.cfg.GetMasterNode()
           return ([mn], [mn])
         def CheckPrereq(self):
           """Check prerequisites.
           This checks whether the given params don't conflict and
           if the given volume group is valid.
           """
           if self.op.vg_name is not None and not self.op.vg_name:
             if self.cfg.HasAnyDiskOfType(constants.LD_LV):
               raise errors.OpPrereqError("Cannot disable lvm storage while lvm-based"
                                          " instances exist", errors.ECODE_INVAL)
           if self.op.drbd_helper is not None and not self.op.drbd_helper:
             if self.cfg.HasAnyDiskOfType(constants.LD_DRBD8):
               raise errors.OpPrereqError("Cannot disable drbd helper while"
                                          " drbd-based instances exist",
                                          errors.ECODE_INVAL)
           node_list = self.owned_locks(locking.LEVEL_NODE)
           # if vg_name not None, checks given volume group on all nodes
           if self.op.vg_name:
             vglist = self.rpc.call_vg_list(node_list)
             for node in node_list:
               msg = vglist[node].fail_msg
               if msg:
                 # ignoring down node
                 self.LogWarning("Error while gathering data on node %s"
                                 " (ignoring node): %s", node, msg)
                 continue
               vgstatus = utils.CheckVolumeGroupSize(vglist[node].payload,
                                                     self.op.vg_name,
                                                     constants.MIN_VG_SIZE)
               if vgstatus:
                 raise errors.OpPrereqError("Error on node '%s': %s" %
                                            (node, vgstatus), errors.ECODE_ENVIRON)
           if self.op.drbd_helper:
             # checks given drbd helper on all nodes
             helpers = self.rpc.call_drbd_helper(node_list)
             for (node, ninfo) in self.cfg.GetMultiNodeInfo(node_list):
               if ninfo.offline:
                 self.LogInfo("Not checking drbd helper on offline node %s", node)
                 continue
               msg = helpers[node].fail_msg
               if msg:
                 raise errors.OpPrereqError("Error checking drbd helper on node"
                                            " '%s': %s" % (node, msg),
                                            errors.ECODE_ENVIRON)
               node_helper = helpers[node].payload
               if node_helper != self.op.drbd_helper:
                 raise errors.OpPrereqError("Error on node '%s': drbd helper is %s" %
                                            (node, node_helper), errors.ECODE_ENVIRON)
           self.cluster = cluster = self.cfg.GetClusterInfo()
           # validate params changes
           if self.op.beparams:
             objects.UpgradeBeParams(self.op.beparams)
             utils.ForceDictType(self.op.beparams, constants.BES_PARAMETER_TYPES)
             self.new_beparams = cluster.SimpleFillBE(self.op.beparams)
           if self.op.ndparams:
             utils.ForceDictType(self.op.ndparams, constants.NDS_PARAMETER_TYPES)
             self.new_ndparams = cluster.SimpleFillND(self.op.ndparams)
             # TODO: we need a more general way to handle resetting
             # cluster-level parameters to default values
             if self.new_ndparams["oob_program"] == "":
               self.new_ndparams["oob_program"] = \
                   constants.NDC_DEFAULTS[constants.ND_OOB_PROGRAM]
           if self.op.nicparams:
             utils.ForceDictType(self.op.nicparams, constants.NICS_PARAMETER_TYPES)
             self.new_nicparams = cluster.SimpleFillNIC(self.op.nicparams)
             objects.NIC.CheckParameterSyntax(self.new_nicparams)
             nic_errors = []
             # check all instances for consistency
             for instance in self.cfg.GetAllInstancesInfo().values():
               for nic_idx, nic in enumerate(instance.nics):
                 params_copy = copy.deepcopy(nic.nicparams)
                 params_filled = objects.FillDict(self.new_nicparams, params_copy)
                 # check parameter syntax
                 try:
                   objects.NIC.CheckParameterSyntax(params_filled)
                 except errors.ConfigurationError, err:
                   nic_errors.append("Instance %s, nic/%d: %s" %
                                     (instance.name, nic_idx, err))
                 # if we're moving instances to routed, check that they have an ip
                 target_mode = params_filled[constants.NIC_MODE]
                 if target_mode == constants.NIC_MODE_ROUTED and not nic.ip:
                   nic_errors.append("Instance %s, nic/%d: routed NIC with no ip"
                                     " address" % (instance.name, nic_idx))
             if nic_errors:
               raise errors.OpPrereqError("Cannot apply the change, errors:\n%s" %
                                          "\n".join(nic_errors))
           # hypervisor list/parameters
           self.new_hvparams = new_hvp = objects.FillDict(cluster.hvparams, {})
           if self.op.hvparams:
             for hv_name, hv_dict in self.op.hvparams.items():
               if hv_name not in self.new_hvparams:
                 self.new_hvparams[hv_name] = hv_dict
               else:
                 self.new_hvparams[hv_name].update(hv_dict)
           # disk template parameters
           self.new_diskparams = objects.FillDict(cluster.diskparams, {})
           if self.op.diskparams:
             for dt_name, dt_params in self.op.diskparams.items():
               if dt_name not in self.op.diskparams:
                 self.new_diskparams[dt_name] = dt_params
               else:
                 self.new_diskparams[dt_name].update(dt_params)
           # os hypervisor parameters
           self.new_os_hvp = objects.FillDict(cluster.os_hvp, {})
           if self.op.os_hvp:
             for os_name, hvs in self.op.os_hvp.items():
               if os_name not in self.new_os_hvp:
                 self.new_os_hvp[os_name] = hvs
               else:
                 for hv_name, hv_dict in hvs.items():
                   if hv_name not in self.new_os_hvp[os_name]:
                     self.new_os_hvp[os_name][hv_name] = hv_dict
                   else:
                     self.new_os_hvp[os_name][hv_name].update(hv_dict)
           # os parameters
           self.new_osp = objects.FillDict(cluster.osparams, {})
           if self.op.osparams:
             for os_name, osp in self.op.osparams.items():
               if os_name not in self.new_osp:
                 self.new_osp[os_name] = {}
               self.new_osp[os_name] = _GetUpdatedParams(self.new_osp[os_name], osp,
                                                         use_none=True)
               if not self.new_osp[os_name]:
                 # we removed all parameters
                 del self.new_osp[os_name]
               else:
                 # check the parameter validity (remote check)
                 _CheckOSParams(self, False, [self.cfg.GetMasterNode()],
                                os_name, self.new_osp[os_name])
           # changes to the hypervisor list
           if self.op.enabled_hypervisors is not None:
             self.hv_list = self.op.enabled_hypervisors
             for hv in self.hv_list:
               # if the hypervisor doesn't already exist in the cluster
               # hvparams, we initialize it to empty, and then (in both
               # cases) we make sure to fill the defaults, as we might not
               # have a complete defaults list if the hypervisor wasn't
               # enabled before
               if hv not in new_hvp:
                 new_hvp[hv] = {}
               new_hvp[hv] = objects.FillDict(constants.HVC_DEFAULTS[hv], new_hvp[hv])
               utils.ForceDictType(new_hvp[hv], constants.HVS_PARAMETER_TYPES)
           else:
             self.hv_list = cluster.enabled_hypervisors
           if self.op.hvparams or self.op.enabled_hypervisors is not None:
             # either the enabled list has changed, or the parameters have, validate
             for hv_name, hv_params in self.new_hvparams.items():
               if ((self.op.hvparams and hv_name in self.op.hvparams) or
                   (self.op.enabled_hypervisors and
                    hv_name in self.op.enabled_hypervisors)):
                 # either this is a new hypervisor, or its parameters have changed
                 hv_class = hypervisor.GetHypervisor(hv_name)
                 utils.ForceDictType(hv_params, constants.HVS_PARAMETER_TYPES)
                 hv_class.CheckParameterSyntax(hv_params)
                 _CheckHVParams(self, node_list, hv_name, hv_params)
           if self.op.os_hvp:
             # no need to check any newly-enabled hypervisors, since the
             # defaults have already been checked in the above code-block
             for os_name, os_hvp in self.new_os_hvp.items():
               for hv_name, hv_params in os_hvp.items():
                 utils.ForceDictType(hv_params, constants.HVS_PARAMETER_TYPES)
                 # we need to fill in the new os_hvp on top of the actual hv_p
                 cluster_defaults = self.new_hvparams.get(hv_name, {})
                 new_osp = objects.FillDict(cluster_defaults, hv_params)
                 hv_class = hypervisor.GetHypervisor(hv_name)
                 hv_class.CheckParameterSyntax(new_osp)
                 _CheckHVParams(self, node_list, hv_name, new_osp)
           if self.op.default_iallocator:
             alloc_script = utils.FindFile(self.op.default_iallocator,
                                           constants.IALLOCATOR_SEARCH_PATH,
                                           os.path.isfile)
             if alloc_script is None:
               raise errors.OpPrereqError("Invalid default iallocator script '%s'"
                                          " specified" % self.op.default_iallocator,
                                          errors.ECODE_INVAL)
         def Exec(self, feedback_fn):
           """Change the parameters of the cluster.
           """
           if self.op.vg_name is not None:
             new_volume = self.op.vg_name
             if not new_volume:
               new_volume = None
             if new_volume != self.cfg.GetVGName():
               self.cfg.SetVGName(new_volume)
             else:
               feedback_fn("Cluster LVM configuration already in desired"
                           " state, not changing")
           if self.op.drbd_helper is not None:
             new_helper = self.op.drbd_helper
             if not new_helper:
               new_helper = None
             if new_helper != self.cfg.GetDRBDHelper():
               self.cfg.SetDRBDHelper(new_helper)
             else:
               feedback_fn("Cluster DRBD helper already in desired state,"
                           " not changing")
           if self.op.hvparams:
             self.cluster.hvparams = self.new_hvparams
           if self.op.os_hvp:
             self.cluster.os_hvp = self.new_os_hvp
           if self.op.enabled_hypervisors is not None:
             self.cluster.hvparams = self.new_hvparams
             self.cluster.enabled_hypervisors = self.op.enabled_hypervisors
           if self.op.beparams:
             self.cluster.beparams[constants.PP_DEFAULT] = self.new_beparams
           if self.op.nicparams:
             self.cluster.nicparams[constants.PP_DEFAULT] = self.new_nicparams
           if self.op.osparams:
             self.cluster.osparams = self.new_osp
           if self.op.ndparams:
             self.cluster.ndparams = self.new_ndparams
           if self.op.diskparams:
             self.cluster.diskparams = self.new_diskparams
           if self.op.candidate_pool_size is not None:
             self.cluster.candidate_pool_size = self.op.candidate_pool_size
             # we need to update the pool size here, otherwise the save will fail
             _AdjustCandidatePool(self, [])
           if self.op.maintain_node_health is not None:
             if self.op.maintain_node_health and not constants.ENABLE_CONFD:
               feedback_fn("Note: CONFD was disabled at build time, node health"
                           " maintenance is not useful (still enabling it)")
             self.cluster.maintain_node_health = self.op.maintain_node_health
           if self.op.prealloc_wipe_disks is not None:
             self.cluster.prealloc_wipe_disks = self.op.prealloc_wipe_disks
           if self.op.add_uids is not None:
             uidpool.AddToUidPool(self.cluster.uid_pool, self.op.add_uids)
           if self.op.remove_uids is not None:
             uidpool.RemoveFromUidPool(self.cluster.uid_pool, self.op.remove_uids)
           if self.op.uid_pool is not None:
             self.cluster.uid_pool = self.op.uid_pool
           if self.op.default_iallocator is not None:
             self.cluster.default_iallocator = self.op.default_iallocator
           if self.op.reserved_lvs is not None:
             self.cluster.reserved_lvs = self.op.reserved_lvs
           if self.op.use_external_mip_script is not None:
             self.cluster.use_external_mip_script = self.op.use_external_mip_script
           def helper_os(aname, mods, desc):
             desc += " OS list"
             lst = getattr(self.cluster, aname)
             for key, val in mods:
               if key == constants.DDM_ADD:
                 if val in lst:
                   feedback_fn("OS %s already in %s, ignoring" % (val, desc))
                 else:
                   lst.append(val)
               elif key == constants.DDM_REMOVE:
                 if val in lst:
                   lst.remove(val)
                 else:
                   feedback_fn("OS %s not found in %s, ignoring" % (val, desc))
               else:
                 raise errors.ProgrammerError("Invalid modification '%s'" % key)
           if self.op.hidden_os:
             helper_os("hidden_os", self.op.hidden_os, "hidden")
           if self.op.blacklisted_os:
             helper_os("blacklisted_os", self.op.blacklisted_os, "blacklisted")
           if self.op.master_netdev:
             master_params = self.cfg.GetMasterNetworkParameters()
             ems = self.cfg.GetUseExternalMipScript()
             feedback_fn("Shutting down master ip on the current netdev (%s)" %
                         self.cluster.master_netdev)
             result = self.rpc.call_node_deactivate_master_ip(master_params.name,
                                                              master_params, ems)
             result.Raise("Could not disable the master ip")
             feedback_fn("Changing master_netdev from %s to %s" %
                         (master_params.netdev, self.op.master_netdev))
             self.cluster.master_netdev = self.op.master_netdev
           if self.op.master_netmask:
             master_params = self.cfg.GetMasterNetworkParameters()
             feedback_fn("Changing master IP netmask to %s" % self.op.master_netmask)
             result = self.rpc.call_node_change_master_netmask(master_params.name,
                                                               master_params.netmask,
                                                               self.op.master_netmask,
                                                               master_params.ip,
                                                               master_params.netdev)
             if result.fail_msg:
               msg = "Could not change the master IP netmask: %s" % result.fail_msg
               feedback_fn(msg)
             self.cluster.master_netmask = self.op.master_netmask
           self.cfg.Update(self.cluster, feedback_fn)
           if self.op.master_netdev:
             master_params = self.cfg.GetMasterNetworkParameters()
             feedback_fn("Starting the master ip on the new master netdev (%s)" %
                         self.op.master_netdev)
             ems = self.cfg.GetUseExternalMipScript()
             result = self.rpc.call_node_activate_master_ip(master_params.name,
                                                            master_params, ems)
             if result.fail_msg:
               self.LogWarning("Could not re-enable the master ip on"
                               " the master, please restart manually: %s",
                               result.fail_msg)
       def _UploadHelper(lu, nodes, fname):
         """Helper for uploading a file and showing warnings.
         """
         if os.path.exists(fname):
           result = lu.rpc.call_upload_file(nodes, fname)
           for to_node, to_result in result.items():
             msg = to_result.fail_msg
             if msg:
               msg = ("Copy of file %s to node %s failed: %s" %
                      (fname, to_node, msg))
               lu.proc.LogWarning(msg)
       def _ComputeAncillaryFiles(cluster, redist):
         """Compute files external to Ganeti which need to be consistent.
         @type redist: boolean
         @param redist: Whether to include files which need to be redistributed
         """
         # Compute files for all nodes
         files_all = set([
           constants.SSH_KNOWN_HOSTS_FILE,
           constants.CONFD_HMAC_KEY,
           constants.CLUSTER_DOMAIN_SECRET_FILE,
           constants.SPICE_CERT_FILE,
           constants.SPICE_CACERT_FILE,
           constants.RAPI_USERS_FILE,
           ])
         if not redist:
           files_all.update(constants.ALL_CERT_FILES)
           files_all.update(ssconf.SimpleStore().GetFileList())
         else:
           # we need to ship at least the RAPI certificate
           files_all.add(constants.RAPI_CERT_FILE)
         if cluster.modify_etc_hosts:
           files_all.add(constants.ETC_HOSTS)
         # Files which are optional, these must:
         # - be present in one other category as well
         # - either exist or not exist on all nodes of that category (mc, vm all)
         files_opt = set([
           constants.RAPI_USERS_FILE,
           ])
         # Files which should only be on master candidates
         files_mc = set()
         if not redist:
           files_mc.add(constants.CLUSTER_CONF_FILE)
           # FIXME: this should also be replicated but Ganeti doesn't support files_mc
           # replication
           files_mc.add(constants.DEFAULT_MASTER_SETUP_SCRIPT)
         # Files which should only be on VM-capable nodes
         files_vm = set(filename
           for hv_name in cluster.enabled_hypervisors
           for filename in hypervisor.GetHypervisor(hv_name).GetAncillaryFiles()[0])
         files_opt |= set(filename
           for hv_name in cluster.enabled_hypervisors
           for filename in hypervisor.GetHypervisor(hv_name).GetAncillaryFiles()[1])
         # Filenames in each category must be unique
         all_files_set = files_all | files_mc | files_vm
         assert (len(all_files_set) ==
                 sum(map(len, [files_all, files_mc, files_vm]))), \
                "Found file listed in more than one file list"
         # Optional files must be present in one other category
         assert all_files_set.issuperset(files_opt), \
                "Optional file not in a different required list"
         return (files_all, files_opt, files_mc, files_vm)
       def _RedistributeAncillaryFiles(lu, additional_nodes=None, additional_vm=True):
         """Distribute additional files which are part of the cluster configuration.
         ConfigWriter takes care of distributing the config and ssconf files, but
         there are more files which should be distributed to all nodes. This function
         makes sure those are copied.
         @param lu: calling logical unit
         @param additional_nodes: list of nodes not in the config to distribute to
         @type additional_vm: boolean
         @param additional_vm: whether the additional nodes are vm-capable or not
         """
         # Gather target nodes
         cluster = lu.cfg.GetClusterInfo()
         master_info = lu.cfg.GetNodeInfo(lu.cfg.GetMasterNode())
         online_nodes = lu.cfg.GetOnlineNodeList()
         vm_nodes = lu.cfg.GetVmCapableNodeList()
         if additional_nodes is not None:
           online_nodes.extend(additional_nodes)
           if additional_vm:
             vm_nodes.extend(additional_nodes)
         # Never distribute to master node
         for nodelist in [online_nodes, vm_nodes]:
           if master_info.name in nodelist:
             nodelist.remove(master_info.name)
         # Gather file lists
         (files_all, _, files_mc, files_vm) = \
           _ComputeAncillaryFiles(cluster, True)
         # Never re-distribute configuration file from here
         assert not (constants.CLUSTER_CONF_FILE in files_all or
                     constants.CLUSTER_CONF_FILE in files_vm)
         assert not files_mc, "Master candidates not handled in this function"
         filemap = [
           (online_nodes, files_all),
           (vm_nodes, files_vm),
+          ]
         # Upload the files
         for (node_list, files) in filemap:
           for fname in files:
             _UploadHelper(lu, node_list, fname)
       class LUClusterRedistConf(NoHooksLU):
         """Force the redistribution of cluster configuration.
         This is a very simple LU.
         """
         REQ_BGL = False
         def ExpandNames(self):
           self.needed_locks = {
             locking.LEVEL_NODE: locking.ALL_SET,
+          }
           self.share_locks[locking.LEVEL_NODE] = 1
         def Exec(self, feedback_fn):
           """Redistribute the configuration.
           """
           self.cfg.Update(self.cfg.GetClusterInfo(), feedback_fn)
           _RedistributeAncillaryFiles(self)
       class LUClusterActivateMasterIp(NoHooksLU):
         """Activate the master IP on the master node.
         """
         def Exec(self, feedback_fn):
           """Activate the master IP.
           """
           master_params = self.cfg.GetMasterNetworkParameters()
           ems = self.cfg.GetUseExternalMipScript()
           result = self.rpc.call_node_activate_master_ip(master_params.name,
                                                          master_params, ems)
           result.Raise("Could not activate the master IP")
       class LUClusterDeactivateMasterIp(NoHooksLU):
         """Deactivate the master IP on the master node.
         """
         def Exec(self, feedback_fn):
           """Deactivate the master IP.
           """
           master_params = self.cfg.GetMasterNetworkParameters()
           ems = self.cfg.GetUseExternalMipScript()
           result = self.rpc.call_node_deactivate_master_ip(master_params.name,
                                                            master_params, ems)
           result.Raise("Could not deactivate the master IP")
       def _WaitForSync(lu, instance, disks=None, oneshot=False):
         """Sleep and poll for an instance's disk to sync.
         """
         if not instance.disks or disks is not None and not disks:
           return True
         disks = _ExpandCheckDisks(instance, disks)
         if not oneshot:
           lu.proc.LogInfo("Waiting for instance %s to sync disks." % instance.name)
         node = instance.primary_node
         for dev in disks:
           lu.cfg.SetDiskID(dev, node)
         # TODO: Convert to utils.Retry
         retries = 0
         degr_retries = 10 # in seconds, as we sleep 1 second each time
         while True:
           max_time = 0
           done = True
           cumul_degraded = False
           rstats = lu.rpc.call_blockdev_getmirrorstatus(node, disks)
           msg = rstats.fail_msg
           if msg:
             lu.LogWarning("Can't get any data from node %s: %s", node, msg)
             retries += 1
             if retries >= 10:
               raise errors.RemoteError("Can't contact node %s for mirror data,"
                                        " aborting." % node)
             time.sleep(6)
             continue
           rstats = rstats.payload
           retries = 0
           for i, mstat in enumerate(rstats):
             if mstat is None:
               lu.LogWarning("Can't compute data for node %s/%s",
                                  node, disks[i].iv_name)
               continue
             cumul_degraded = (cumul_degraded or
                               (mstat.is_degraded and mstat.sync_percent is None))
             if mstat.sync_percent is not None:
               done = False
               if mstat.estimated_time is not None:
                 rem_time = ("%s remaining (estimated)" %
                             utils.FormatSeconds(mstat.estimated_time))
                 max_time = mstat.estimated_time
               else:
                 rem_time = "no time estimate"
               lu.proc.LogInfo("- device %s: %5.2f%% done, %s" %
                               (disks[i].iv_name, mstat.sync_percent, rem_time))
           # if we're done but degraded, let's do a few small retries, to
           # make sure we see a stable and not transient situation; therefore
           # we force restart of the loop
           if (done or oneshot) and cumul_degraded and degr_retries > 0:
             logging.info("Degraded disks found, %d retries left", degr_retries)
             degr_retries -= 1
             time.sleep(1)
             continue
           if done or oneshot:
             break
           time.sleep(min(60, max_time))
         if done:
           lu.proc.LogInfo("Instance %s's disks are in sync." % instance.name)
         return not cumul_degraded
       def _CheckDiskConsistency(lu, dev, node, on_primary, ldisk=False):
         """Check that mirrors are not degraded.
         The ldisk parameter, if True, will change the test from the
         is_degraded attribute (which represents overall non-ok status for
         the device(s)) to the ldisk (representing the local storage status).
         """
         lu.cfg.SetDiskID(dev, node)
         result = True
         if on_primary or dev.AssembleOnSecondary():
           rstats = lu.rpc.call_blockdev_find(node, dev)
           msg = rstats.fail_msg
           if msg:
             lu.LogWarning("Can't find disk on node %s: %s", node, msg)
             result = False
           elif not rstats.payload:
             lu.LogWarning("Can't find disk on node %s", node)
             result = False
           else:
             if ldisk:
               result = result and rstats.payload.ldisk_status == constants.LDS_OKAY
             else:
               result = result and not rstats.payload.is_degraded
         if dev.children:
           for child in dev.children:
             result = result and _CheckDiskConsistency(lu, child, node, on_primary)
         return result
       class LUOobCommand(NoHooksLU):
         """Logical unit for OOB handling.
         """
         REG_BGL = False
         _SKIP_MASTER = (constants.OOB_POWER_OFF, constants.OOB_POWER_CYCLE)
         def ExpandNames(self):
           """Gather locks we need.
           """
           if self.op.node_names:
             self.op.node_names = _GetWantedNodes(self, self.op.node_names)
             lock_names = self.op.node_names
           else:
             lock_names = locking.ALL_SET
           self.needed_locks = {
             locking.LEVEL_NODE: lock_names,
+            }
         def CheckPrereq(self):
           """Check prerequisites.
           This checks:
            - the node exists in the configuration
            - OOB is supported
           Any errors are signaled by raising errors.OpPrereqError.
           """
           self.nodes = []
           self.master_node = self.cfg.GetMasterNode()
           assert self.op.power_delay >= 0.0
           if self.op.node_names:
             if (self.op.command in self._SKIP_MASTER and
                 self.master_node in self.op.node_names):
               master_node_obj = self.cfg.GetNodeInfo(self.master_node)
               master_oob_handler = _SupportsOob(self.cfg, master_node_obj)
               if master_oob_handler:
                 additional_text = ("run '%s %s %s' if you want to operate on the"
                                    " master regardless") % (master_oob_handler,
                                                             self.op.command,
                                                             self.master_node)
               else:
                 additional_text = "it does not support out-of-band operations"
               raise errors.OpPrereqError(("Operating on the master node %s is not"
                                           " allowed for %s; %s") %
                                          (self.master_node, self.op.command,
                                           additional_text), errors.ECODE_INVAL)
           else:
             self.op.node_names = self.cfg.GetNodeList()
             if self.op.command in self._SKIP_MASTER:
               self.op.node_names.remove(self.master_node)
           if self.op.command in self._SKIP_MASTER:
             assert self.master_node not in self.op.node_names
           for (node_name, node) in self.cfg.GetMultiNodeInfo(self.op.node_names):
             if node is None:
               raise errors.OpPrereqError("Node %s not found" % node_name,
                                          errors.ECODE_NOENT)
             else:
               self.nodes.append(node)
             if (not self.op.ignore_status and
                 (self.op.command == constants.OOB_POWER_OFF and not node.offline)):
               raise errors.OpPrereqError(("Cannot power off node %s because it is"
                                           " not marked offline") % node_name,
                                          errors.ECODE_STATE)
         def Exec(self, feedback_fn):
           """Execute OOB and return result if we expect any.
           """
           master_node = self.master_node
           ret = []
           for idx, node in enumerate(utils.NiceSort(self.nodes,
                                                     key=lambda node: node.name)):
             node_entry = [(constants.RS_NORMAL, node.name)]
             ret.append(node_entry)
             oob_program = _SupportsOob(self.cfg, node)
             if not oob_program:
               node_entry.append((constants.RS_UNAVAIL, None))
               continue
             logging.info("Executing out-of-band command '%s' using '%s' on %s",
                          self.op.command, oob_program, node.name)
             result = self.rpc.call_run_oob(master_node, oob_program,
                                            self.op.command, node.name,
                                            self.op.timeout)
             if result.fail_msg:
               self.LogWarning("Out-of-band RPC failed on node '%s': %s",
                               node.name, result.fail_msg)
               node_entry.append((constants.RS_NODATA, None))
             else:
               try:
                 self._CheckPayload(result)
               except errors.OpExecError, err:
                 self.LogWarning("Payload returned by node '%s' is not valid: %s",
                                 node.name, err)
                 node_entry.append((constants.RS_NODATA, None))
               else:
                 if self.op.command == constants.OOB_HEALTH:
                   # For health we should log important events
                   for item, status in result.payload:
                     if status in [constants.OOB_STATUS_WARNING,
                                   constants.OOB_STATUS_CRITICAL]:
                       self.LogWarning("Item '%s' on node '%s' has status '%s'",
                                       item, node.name, status)
                 if self.op.command == constants.OOB_POWER_ON:
                   node.powered = True
                 elif self.op.command == constants.OOB_POWER_OFF:
                   node.powered = False
                 elif self.op.command == constants.OOB_POWER_STATUS:
                   powered = result.payload[constants.OOB_POWER_STATUS_POWERED]
                   if powered != node.powered:
                     logging.warning(("Recorded power state (%s) of node '%s' does not"
                                      " match actual power state (%s)"), node.powered,
                                     node.name, powered)
                 # For configuration changing commands we should update the node
                 if self.op.command in (constants.OOB_POWER_ON,
                                        constants.OOB_POWER_OFF):
                   self.cfg.Update(node, feedback_fn)
                 node_entry.append((constants.RS_NORMAL, result.payload))
                 if (self.op.command == constants.OOB_POWER_ON and
                     idx < len(self.nodes) - 1):
                   time.sleep(self.op.power_delay)
           return ret
         def _CheckPayload(self, result):
           """Checks if the payload is valid.
           @param result: RPC result
           @raises errors.OpExecError: If payload is not valid
           """
           errs = []
           if self.op.command == constants.OOB_HEALTH:
             if not isinstance(result.payload, list):
               errs.append("command 'health' is expected to return a list but got %s" %
                           type(result.payload))
             else:
               for item, status in result.payload:
                 if status not in constants.OOB_STATUSES:
                   errs.append("health item '%s' has invalid status '%s'" %
                               (item, status))
           if self.op.command == constants.OOB_POWER_STATUS:
             if not isinstance(result.payload, dict):
               errs.append("power-status is expected to return a dict but got %s" %
                           type(result.payload))
           if self.op.command in [
               constants.OOB_POWER_ON,
               constants.OOB_POWER_OFF,
               constants.OOB_POWER_CYCLE,
               ]:
             if result.payload is not None:
               errs.append("%s is expected to not return payload but got '%s'" %
                           (self.op.command, result.payload))
           if errs:
             raise errors.OpExecError("Check of out-of-band payload failed due to %s" %
                                      utils.CommaJoin(errs))
       class _OsQuery(_QueryBase):
         FIELDS = query.OS_FIELDS
         def ExpandNames(self, lu):
           # Lock all nodes in shared mode
           # Temporary removal of locks, should be reverted later
           # TODO: reintroduce locks when they are lighter-weight
           lu.needed_locks = {}
           #self.share_locks[locking.LEVEL_NODE] = 1
           #self.needed_locks[locking.LEVEL_NODE] = locking.ALL_SET
           # The following variables interact with _QueryBase._GetNames
           if self.names:
             self.wanted = self.names
           else:
             self.wanted = locking.ALL_SET
           self.do_locking = self.use_locking
         def DeclareLocks(self, lu, level):
           pass
         @staticmethod
         def _DiagnoseByOS(rlist):
           """Remaps a per-node return list into an a per-os per-node dictionary
           @param rlist: a map with node names as keys and OS objects as values
           @rtype: dict
           @return: a dictionary with osnames as keys and as value another
               map, with nodes as keys and tuples of (path, status, diagnose,
               variants, parameters, api_versions) as values, eg::
                 {"debian-etch": {"node1": [(/usr/lib/..., True, "", [], []),
                                            (/srv/..., False, "invalid api")],
                                  "node2": [(/srv/..., True, "", [], [])]}
+                }
           """
           all_os = {}
           # we build here the list of nodes that didn't fail the RPC (at RPC
           # level), so that nodes with a non-responding node daemon don't
           # make all OSes invalid
           good_nodes = [node_name for node_name in rlist
                         if not rlist[node_name].fail_msg]
           for node_name, nr in rlist.items():
             if nr.fail_msg or not nr.payload:
               continue
             for (name, path, status, diagnose, variants,
                  params, api_versions) in nr.payload:
               if name not in all_os:
                 # build a list of nodes for this os containing empty lists
                 # for each node in node_list
                 all_os[name] = {}
                 for nname in good_nodes:
                   all_os[name][nname] = []
               # convert params from [name, help] to (name, help)
               params = [tuple(v) for v in params]
               all_os[name][node_name].append((path, status, diagnose,
                                               variants, params, api_versions))
           return all_os
         def _GetQueryData(self, lu):
           """Computes the list of nodes and their attributes.
           """
           # Locking is not used
           assert not (compat.any(lu.glm.is_owned(level)
                                  for level in locking.LEVELS
                                  if level != locking.LEVEL_CLUSTER) or
                       self.do_locking or self.use_locking)
           valid_nodes = [node.name
                          for node in lu.cfg.GetAllNodesInfo().values()
                          if not node.offline and node.vm_capable]
           pol = self._DiagnoseByOS(lu.rpc.call_os_diagnose(valid_nodes))
           cluster = lu.cfg.GetClusterInfo()
           data = {}
           for (os_name, os_data) in pol.items():
             info = query.OsInfo(name=os_name, valid=True, node_status=os_data,
                                 hidden=(os_name in cluster.hidden_os),
                                 blacklisted=(os_name in cluster.blacklisted_os))
             variants = set()
             parameters = set()
             api_versions = set()
             for idx, osl in enumerate(os_data.values()):
               info.valid = bool(info.valid and osl and osl[0][1])
               if not info.valid:
                 break
               (node_variants, node_params, node_api) = osl[0][3:6]
               if idx == 0:
                 # First entry
                 variants.update(node_variants)
                 parameters.update(node_params)
                 api_versions.update(node_api)
               else:
                 # Filter out inconsistent values
                 variants.intersection_update(node_variants)
                 parameters.intersection_update(node_params)
                 api_versions.intersection_update(node_api)
             info.variants = list(variants)
             info.parameters = list(parameters)
             info.api_versions = list(api_versions)
             data[os_name] = info
           # Prepare data in requested order
           return [data[name] for name in self._GetNames(lu, pol.keys(), None)
                   if name in data]
       class LUOsDiagnose(NoHooksLU):
         """Logical unit for OS diagnose/query.
         """
         REQ_BGL = False
         @staticmethod
         def _BuildFilter(fields, names):
           """Builds a filter for querying OSes.
           """
           name_filter = qlang.MakeSimpleFilter("name", names)
           # Legacy behaviour: Hide hidden, blacklisted or invalid OSes if the
           # respective field is not requested
           status_filter = [[qlang.OP_NOT, [qlang.OP_TRUE, fname]]
                            for fname in ["hidden", "blacklisted"]
                            if fname not in fields]
           if "valid" not in fields:
             status_filter.append([qlang.OP_TRUE, "valid"])
           if status_filter:
             status_filter.insert(0, qlang.OP_AND)
           else:
             status_filter = None
           if name_filter and status_filter:
             return [qlang.OP_AND, name_filter, status_filter]
           elif name_filter:
             return name_filter
           else:
             return status_filter
         def CheckArguments(self):
           self.oq = _OsQuery(self._BuildFilter(self.op.output_fields, self.op.names),
                              self.op.output_fields, False)
         def ExpandNames(self):
           self.oq.ExpandNames(self)
         def Exec(self, feedback_fn):
           return self.oq.OldStyleQuery(self)
       class LUNodeRemove(LogicalUnit):
         """Logical unit for removing a node.
         """
         HPATH = "node-remove"
         HTYPE = constants.HTYPE_NODE
         def BuildHooksEnv(self):
           """Build hooks env.
           This doesn't run on the target node in the pre phase as a failed
           node would then be impossible to remove.
           """
           return {
             "OP_TARGET": self.op.node_name,
             "NODE_NAME": self.op.node_name,
+            }
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           all_nodes = self.cfg.GetNodeList()
           try:
             all_nodes.remove(self.op.node_name)
           except ValueError:
             logging.warning("Node '%s', which is about to be removed, was not found"
                             " in the list of all nodes", self.op.node_name)
           return (all_nodes, all_nodes)
         def CheckPrereq(self):
           """Check prerequisites.
           This checks:
            - the node exists in the configuration
            - it does not have primary or secondary instances
            - it's not the master
           Any errors are signaled by raising errors.OpPrereqError.
           """
           self.op.node_name = _ExpandNodeName(self.cfg, self.op.node_name)
           node = self.cfg.GetNodeInfo(self.op.node_name)
           assert node is not None
           masternode = self.cfg.GetMasterNode()
           if node.name == masternode:
             raise errors.OpPrereqError("Node is the master node, failover to another"
                                        " node is required", errors.ECODE_INVAL)
           for instance_name, instance in self.cfg.GetAllInstancesInfo().items():
             if node.name in instance.all_nodes:
               raise errors.OpPrereqError("Instance %s is still running on the node,"
                                          " please remove first" % instance_name,
                                          errors.ECODE_INVAL)
           self.op.node_name = node.name
           self.node = node
         def Exec(self, feedback_fn):
           """Removes the node from the cluster.
           """
           node = self.node
           logging.info("Stopping the node daemon and removing configs from node %s",
                        node.name)
           modify_ssh_setup = self.cfg.GetClusterInfo().modify_ssh_setup
           assert locking.BGL in self.owned_locks(locking.LEVEL_CLUSTER), \
             "Not owning BGL"
           # Promote nodes to master candidate as needed
           _AdjustCandidatePool(self, exceptions=[node.name])
           self.context.RemoveNode(node.name)
           # Run post hooks on the node before it's removed
           _RunPostHook(self, node.name)
           result = self.rpc.call_node_leave_cluster(node.name, modify_ssh_setup)
           msg = result.fail_msg
           if msg:
             self.LogWarning("Errors encountered on the remote node while leaving"
                             " the cluster: %s", msg)
           # Remove node from our /etc/hosts
           if self.cfg.GetClusterInfo().modify_etc_hosts:
             master_node = self.cfg.GetMasterNode()
             result = self.rpc.call_etc_hosts_modify(master_node,
                                                     constants.ETC_HOSTS_REMOVE,
                                                     node.name, None)
             result.Raise("Can't update hosts file with new host data")
             _RedistributeAncillaryFiles(self)
       class _NodeQuery(_QueryBase):
         FIELDS = query.NODE_FIELDS
         def ExpandNames(self, lu):
           lu.needed_locks = {}
           lu.share_locks = _ShareAll()
           if self.names:
             self.wanted = _GetWantedNodes(lu, self.names)
           else:
             self.wanted = locking.ALL_SET
           self.do_locking = (self.use_locking and
                              query.NQ_LIVE in self.requested_data)
           if self.do_locking:
             # If any non-static field is requested we need to lock the nodes
             lu.needed_locks[locking.LEVEL_NODE] = self.wanted
         def DeclareLocks(self, lu, level):
           pass
         def _GetQueryData(self, lu):
           """Computes the list of nodes and their attributes.
           """
           all_info = lu.cfg.GetAllNodesInfo()
           nodenames = self._GetNames(lu, all_info.keys(), locking.LEVEL_NODE)
           # Gather data as requested
           if query.NQ_LIVE in self.requested_data:
             # filter out non-vm_capable nodes
             toquery_nodes = [name for name in nodenames if all_info[name].vm_capable]
             node_data = lu.rpc.call_node_info(toquery_nodes, [lu.cfg.GetVGName()],
                                               [lu.cfg.GetHypervisorType()])
             live_data = dict((name, _MakeLegacyNodeInfo(nresult.payload))
                              for (name, nresult) in node_data.items()
                              if not nresult.fail_msg and nresult.payload)
           else:
             live_data = None
           if query.NQ_INST in self.requested_data:
             node_to_primary = dict([(name, set()) for name in nodenames])
             node_to_secondary = dict([(name, set()) for name in nodenames])
             inst_data = lu.cfg.GetAllInstancesInfo()
             for inst in inst_data.values():
               if inst.primary_node in node_to_primary:
                 node_to_primary[inst.primary_node].add(inst.name)
               for secnode in inst.secondary_nodes:
                 if secnode in node_to_secondary:
                   node_to_secondary[secnode].add(inst.name)
           else:
             node_to_primary = None
             node_to_secondary = None
           if query.NQ_OOB in self.requested_data:
             oob_support = dict((name, bool(_SupportsOob(lu.cfg, node)))
                                for name, node in all_info.iteritems())
           else:
             oob_support = None
           if query.NQ_GROUP in self.requested_data:
             groups = lu.cfg.GetAllNodeGroupsInfo()
           else:
             groups = {}
           return query.NodeQueryData([all_info[name] for name in nodenames],
                                      live_data, lu.cfg.GetMasterNode(),
                                      node_to_primary, node_to_secondary, groups,
                                      oob_support, lu.cfg.GetClusterInfo())
       class LUNodeQuery(NoHooksLU):
         """Logical unit for querying nodes.
         """
         # pylint: disable=W0142
         REQ_BGL = False
         def CheckArguments(self):
           self.nq = _NodeQuery(qlang.MakeSimpleFilter("name", self.op.names),
                                self.op.output_fields, self.op.use_locking)
         def ExpandNames(self):
           self.nq.ExpandNames(self)
         def DeclareLocks(self, level):
           self.nq.DeclareLocks(self, level)
         def Exec(self, feedback_fn):
           return self.nq.OldStyleQuery(self)
       class LUNodeQueryvols(NoHooksLU):
         """Logical unit for getting volumes on node(s).
         """
         REQ_BGL = False
         _FIELDS_DYNAMIC = utils.FieldSet("phys", "vg", "name", "size", "instance")
         _FIELDS_STATIC = utils.FieldSet("node")
         def CheckArguments(self):
           _CheckOutputFields(static=self._FIELDS_STATIC,
                              dynamic=self._FIELDS_DYNAMIC,
                              selected=self.op.output_fields)
         def ExpandNames(self):
           self.share_locks = _ShareAll()
           self.needed_locks = {}
           if not self.op.nodes:
             self.needed_locks[locking.LEVEL_NODE] = locking.ALL_SET
           else:
             self.needed_locks[locking.LEVEL_NODE] = \
               _GetWantedNodes(self, self.op.nodes)
         def Exec(self, feedback_fn):
           """Computes the list of nodes and their attributes.
           """
           nodenames = self.owned_locks(locking.LEVEL_NODE)
           volumes = self.rpc.call_node_volumes(nodenames)
           ilist = self.cfg.GetAllInstancesInfo()
           vol2inst = _MapInstanceDisksToNodes(ilist.values())
           output = []
           for node in nodenames:
             nresult = volumes[node]
             if nresult.offline:
               continue
             msg = nresult.fail_msg
             if msg:
               self.LogWarning("Can't compute volume data on node %s: %s", node, msg)
               continue
             node_vols = sorted(nresult.payload,
                                key=operator.itemgetter("dev"))
             for vol in node_vols:
               node_output = []
               for field in self.op.output_fields:
                 if field == "node":
                   val = node
                 elif field == "phys":
                   val = vol["dev"]
                 elif field == "vg":
                   val = vol["vg"]
                 elif field == "name":
                   val = vol["name"]
                 elif field == "size":
                   val = int(float(vol["size"]))
                 elif field == "instance":
                   val = vol2inst.get((node, vol["vg"] + "/" + vol["name"]), "-")
                 else:
                   raise errors.ParameterError(field)
                 node_output.append(str(val))
               output.append(node_output)
           return output
       class LUNodeQueryStorage(NoHooksLU):
         """Logical unit for getting information on storage units on node(s).
         """
         _FIELDS_STATIC = utils.FieldSet(constants.SF_NODE)
         REQ_BGL = False
         def CheckArguments(self):
           _CheckOutputFields(static=self._FIELDS_STATIC,
                              dynamic=utils.FieldSet(*constants.VALID_STORAGE_FIELDS),
                              selected=self.op.output_fields)
         def ExpandNames(self):
           self.share_locks = _ShareAll()
           self.needed_locks = {}
           if self.op.nodes:
             self.needed_locks[locking.LEVEL_NODE] = \
               _GetWantedNodes(self, self.op.nodes)
           else:
             self.needed_locks[locking.LEVEL_NODE] = locking.ALL_SET
         def Exec(self, feedback_fn):
           """Computes the list of nodes and their attributes.
           """
           self.nodes = self.owned_locks(locking.LEVEL_NODE)
           # Always get name to sort by
           if constants.SF_NAME in self.op.output_fields:
             fields = self.op.output_fields[:]
           else:
             fields = [constants.SF_NAME] + self.op.output_fields
           # Never ask for node or type as it's only known to the LU
           for extra in [constants.SF_NODE, constants.SF_TYPE]:
             while extra in fields:
               fields.remove(extra)
           field_idx = dict([(name, idx) for (idx, name) in enumerate(fields)])
           name_idx = field_idx[constants.SF_NAME]
           st_args = _GetStorageTypeArgs(self.cfg, self.op.storage_type)
           data = self.rpc.call_storage_list(self.nodes,
                                             self.op.storage_type, st_args,
                                             self.op.name, fields)
           result = []
           for node in utils.NiceSort(self.nodes):
             nresult = data[node]
             if nresult.offline:
               continue
             msg = nresult.fail_msg
             if msg:
               self.LogWarning("Can't get storage data from node %s: %s", node, msg)
               continue
             rows = dict([(row[name_idx], row) for row in nresult.payload])
             for name in utils.NiceSort(rows.keys()):
               row = rows[name]
               out = []
               for field in self.op.output_fields:
                 if field == constants.SF_NODE:
                   val = node
                 elif field == constants.SF_TYPE:
                   val = self.op.storage_type
                 elif field in field_idx:
                   val = row[field_idx[field]]
                 else:
                   raise errors.ParameterError(field)
                 out.append(val)
               result.append(out)
           return result
       class _InstanceQuery(_QueryBase):
         FIELDS = query.INSTANCE_FIELDS
         def ExpandNames(self, lu):
           lu.needed_locks = {}
           lu.share_locks = _ShareAll()
           if self.names:
             self.wanted = _GetWantedInstances(lu, self.names)
           else:
             self.wanted = locking.ALL_SET
           self.do_locking = (self.use_locking and
                              query.IQ_LIVE in self.requested_data)
           if self.do_locking:
             lu.needed_locks[locking.LEVEL_INSTANCE] = self.wanted
             lu.needed_locks[locking.LEVEL_NODEGROUP] = []
             lu.needed_locks[locking.LEVEL_NODE] = []
             lu.recalculate_locks[locking.LEVEL_NODE] = constants.LOCKS_REPLACE
           self.do_grouplocks = (self.do_locking and
                                 query.IQ_NODES in self.requested_data)
         def DeclareLocks(self, lu, level):
           if self.do_locking:
             if level == locking.LEVEL_NODEGROUP and self.do_grouplocks:
               assert not lu.needed_locks[locking.LEVEL_NODEGROUP]
               # Lock all groups used by instances optimistically; this requires going
               # via the node before it's locked, requiring verification later on
               lu.needed_locks[locking.LEVEL_NODEGROUP] = \
                 set(group_uuid
                     for instance_name in lu.owned_locks(locking.LEVEL_INSTANCE)
                     for group_uuid in lu.cfg.GetInstanceNodeGroups(instance_name))
             elif level == locking.LEVEL_NODE:
               lu._LockInstancesNodes() # pylint: disable=W0212
         @staticmethod
         def _CheckGroupLocks(lu):
           owned_instances = frozenset(lu.owned_locks(locking.LEVEL_INSTANCE))
           owned_groups = frozenset(lu.owned_locks(locking.LEVEL_NODEGROUP))
           # Check if node groups for locked instances are still correct
           for instance_name in owned_instances:
             _CheckInstanceNodeGroups(lu.cfg, instance_name, owned_groups)
         def _GetQueryData(self, lu):
           """Computes the list of instances and their attributes.
           """
           if self.do_grouplocks:
             self._CheckGroupLocks(lu)
           cluster = lu.cfg.GetClusterInfo()
           all_info = lu.cfg.GetAllInstancesInfo()
           instance_names = self._GetNames(lu, all_info.keys(), locking.LEVEL_INSTANCE)
           instance_list = [all_info[name] for name in instance_names]
           nodes = frozenset(itertools.chain(*(inst.all_nodes
                                               for inst in instance_list)))
           hv_list = list(set([inst.hypervisor for inst in instance_list]))
           bad_nodes = []
           offline_nodes = []
           wrongnode_inst = set()
           # Gather data as requested
           if self.requested_data & set([query.IQ_LIVE, query.IQ_CONSOLE]):
             live_data = {}
             node_data = lu.rpc.call_all_instances_info(nodes, hv_list)
             for name in nodes:
               result = node_data[name]
               if result.offline:
                 # offline nodes will be in both lists
                 assert result.fail_msg
                 offline_nodes.append(name)
               if result.fail_msg:
                 bad_nodes.append(name)
               elif result.payload:
                 for inst in result.payload:
                   if inst in all_info:
                     if all_info[inst].primary_node == name:
                       live_data.update(result.payload)
                     else:
                       wrongnode_inst.add(inst)
                   else:
                     # orphan instance; we don't list it here as we don't
                     # handle this case yet in the output of instance listing
                     logging.warning("Orphan instance '%s' found on node %s",
                                     inst, name)
               # else no instance is alive
           else:
             live_data = {}
           if query.IQ_DISKUSAGE in self.requested_data:
             disk_usage = dict((inst.name,
                                _ComputeDiskSize(inst.disk_template,
                                                 [{constants.IDISK_SIZE: disk.size}
                                                  for disk in inst.disks]))
                               for inst in instance_list)
           else:
             disk_usage = None
           if query.IQ_CONSOLE in self.requested_data:
             consinfo = {}
             for inst in instance_list:
               if inst.name in live_data:
                 # Instance is running
                 consinfo[inst.name] = _GetInstanceConsole(cluster, inst)
               else:
                 consinfo[inst.name] = None
             assert set(consinfo.keys()) == set(instance_names)
           else:
             consinfo = None
           if query.IQ_NODES in self.requested_data:
             node_names = set(itertools.chain(*map(operator.attrgetter("all_nodes"),
                                                   instance_list)))
             nodes = dict(lu.cfg.GetMultiNodeInfo(node_names))
             groups = dict((uuid, lu.cfg.GetNodeGroup(uuid))
                           for uuid in set(map(operator.attrgetter("group"),
                                               nodes.values())))
           else:
             nodes = None
             groups = None
           return query.InstanceQueryData(instance_list, lu.cfg.GetClusterInfo(),
                                          disk_usage, offline_nodes, bad_nodes,
                                          live_data, wrongnode_inst, consinfo,
                                          nodes, groups)
       class LUQuery(NoHooksLU):
         """Query for resources/items of a certain kind.
         """
         # pylint: disable=W0142
         REQ_BGL = False
         def CheckArguments(self):
           qcls = _GetQueryImplementation(self.op.what)
           self.impl = qcls(self.op.qfilter, self.op.fields, self.op.use_locking)
         def ExpandNames(self):
           self.impl.ExpandNames(self)
         def DeclareLocks(self, level):
           self.impl.DeclareLocks(self, level)
         def Exec(self, feedback_fn):
           return self.impl.NewStyleQuery(self)
       class LUQueryFields(NoHooksLU):
         """Query for resources/items of a certain kind.
         """
         # pylint: disable=W0142
         REQ_BGL = False
         def CheckArguments(self):
           self.qcls = _GetQueryImplementation(self.op.what)
         def ExpandNames(self):
           self.needed_locks = {}
         def Exec(self, feedback_fn):
           return query.QueryFields(self.qcls.FIELDS, self.op.fields)
       class LUNodeModifyStorage(NoHooksLU):
         """Logical unit for modifying a storage volume on a node.
         """
         REQ_BGL = False
         def CheckArguments(self):
           self.op.node_name = _ExpandNodeName(self.cfg, self.op.node_name)
           storage_type = self.op.storage_type
           try:
             modifiable = constants.MODIFIABLE_STORAGE_FIELDS[storage_type]
           except KeyError:
             raise errors.OpPrereqError("Storage units of type '%s' can not be"
                                        " modified" % storage_type,
                                        errors.ECODE_INVAL)
           diff = set(self.op.changes.keys()) - modifiable
           if diff:
             raise errors.OpPrereqError("The following fields can not be modified for"
                                        " storage units of type '%s': %r" %
                                        (storage_type, list(diff)),
                                        errors.ECODE_INVAL)
         def ExpandNames(self):
           self.needed_locks = {
             locking.LEVEL_NODE: self.op.node_name,
+            }
         def Exec(self, feedback_fn):
           """Computes the list of nodes and their attributes.
           """
           st_args = _GetStorageTypeArgs(self.cfg, self.op.storage_type)
           result = self.rpc.call_storage_modify(self.op.node_name,
                                                 self.op.storage_type, st_args,
                                                 self.op.name, self.op.changes)
           result.Raise("Failed to modify storage unit '%s' on %s" %
                        (self.op.name, self.op.node_name))
       class LUNodeAdd(LogicalUnit):
         """Logical unit for adding node to the cluster.
         """
         HPATH = "node-add"
         HTYPE = constants.HTYPE_NODE
         _NFLAGS = ["master_capable", "vm_capable"]
         def CheckArguments(self):
           self.primary_ip_family = self.cfg.GetPrimaryIPFamily()
           # validate/normalize the node name
           self.hostname = netutils.GetHostname(name=self.op.node_name,
                                                family=self.primary_ip_family)
           self.op.node_name = self.hostname.name
           if self.op.readd and self.op.node_name == self.cfg.GetMasterNode():
             raise errors.OpPrereqError("Cannot readd the master node",
                                        errors.ECODE_STATE)
           if self.op.readd and self.op.group:
             raise errors.OpPrereqError("Cannot pass a node group when a node is"
                                        " being readded", errors.ECODE_INVAL)
         def BuildHooksEnv(self):
           """Build hooks env.
           This will run on all nodes before, and on all nodes + the new node after.
           """
           return {
             "OP_TARGET": self.op.node_name,
             "NODE_NAME": self.op.node_name,
             "NODE_PIP": self.op.primary_ip,
             "NODE_SIP": self.op.secondary_ip,
             "MASTER_CAPABLE": str(self.op.master_capable),
             "VM_CAPABLE": str(self.op.vm_capable),
+            }
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           # Exclude added node
           pre_nodes = list(set(self.cfg.GetNodeList()) - set([self.op.node_name]))
           post_nodes = pre_nodes + [self.op.node_name, ]
           return (pre_nodes, post_nodes)
         def CheckPrereq(self):
           """Check prerequisites.
           This checks:
            - the new node is not already in the config
            - it is resolvable
            - its parameters (single/dual homed) matches the cluster
           Any errors are signaled by raising errors.OpPrereqError.
           """
           cfg = self.cfg
           hostname = self.hostname
           node = hostname.name
           primary_ip = self.op.primary_ip = hostname.ip
           if self.op.secondary_ip is None:
             if self.primary_ip_family == netutils.IP6Address.family:
               raise errors.OpPrereqError("When using a IPv6 primary address, a valid"
                                          " IPv4 address must be given as secondary",
                                          errors.ECODE_INVAL)
             self.op.secondary_ip = primary_ip
           secondary_ip = self.op.secondary_ip
           if not netutils.IP4Address.IsValid(secondary_ip):
             raise errors.OpPrereqError("Secondary IP (%s) needs to be a valid IPv4"
                                        " address" % secondary_ip, errors.ECODE_INVAL)
           node_list = cfg.GetNodeList()
           if not self.op.readd and node in node_list:
             raise errors.OpPrereqError("Node %s is already in the configuration" %
                                        node, errors.ECODE_EXISTS)
           elif self.op.readd and node not in node_list:
             raise errors.OpPrereqError("Node %s is not in the configuration" % node,
                                        errors.ECODE_NOENT)
           self.changed_primary_ip = False
           for existing_node_name, existing_node in cfg.GetMultiNodeInfo(node_list):
             if self.op.readd and node == existing_node_name:
               if existing_node.secondary_ip != secondary_ip:
                 raise errors.OpPrereqError("Readded node doesn't have the same IP"
                                            " address configuration as before",
                                            errors.ECODE_INVAL)
               if existing_node.primary_ip != primary_ip:
                 self.changed_primary_ip = True
               continue
             if (existing_node.primary_ip == primary_ip or
                 existing_node.secondary_ip == primary_ip or
                 existing_node.primary_ip == secondary_ip or
                 existing_node.secondary_ip == secondary_ip):
               raise errors.OpPrereqError("New node ip address(es) conflict with"
                                          " existing node %s" % existing_node.name,
                                          errors.ECODE_NOTUNIQUE)
           # After this 'if' block, None is no longer a valid value for the
           # _capable op attributes
           if self.op.readd:
             old_node = self.cfg.GetNodeInfo(node)
             assert old_node is not None, "Can't retrieve locked node %s" % node
             for attr in self._NFLAGS:
               if getattr(self.op, attr) is None:
                 setattr(self.op, attr, getattr(old_node, attr))
           else:
             for attr in self._NFLAGS:
               if getattr(self.op, attr) is None:
                 setattr(self.op, attr, True)
           if self.op.readd and not self.op.vm_capable:
             pri, sec = cfg.GetNodeInstances(node)
             if pri or sec:
               raise errors.OpPrereqError("Node %s being re-added with vm_capable"
                                          " flag set to false, but it already holds"
                                          " instances" % node,
                                          errors.ECODE_STATE)
           # check that the type of the node (single versus dual homed) is the
           # same as for the master
           myself = cfg.GetNodeInfo(self.cfg.GetMasterNode())
           master_singlehomed = myself.secondary_ip == myself.primary_ip
           newbie_singlehomed = secondary_ip == primary_ip
           if master_singlehomed != newbie_singlehomed:
             if master_singlehomed:
               raise errors.OpPrereqError("The master has no secondary ip but the"
                                          " new node has one",
                                          errors.ECODE_INVAL)
             else:
               raise errors.OpPrereqError("The master has a secondary ip but the"
                                          " new node doesn't have one",
                                          errors.ECODE_INVAL)
           # checks reachability
           if not netutils.TcpPing(primary_ip, constants.DEFAULT_NODED_PORT):
             raise errors.OpPrereqError("Node not reachable by ping",
                                        errors.ECODE_ENVIRON)
           if not newbie_singlehomed:
             # check reachability from my secondary ip to newbie's secondary ip
             if not netutils.TcpPing(secondary_ip, constants.DEFAULT_NODED_PORT,
                                  source=myself.secondary_ip):
               raise errors.OpPrereqError("Node secondary ip not reachable by TCP"
                                          " based ping to node daemon port",
                                          errors.ECODE_ENVIRON)
           if self.op.readd:
             exceptions = [node]
           else:
             exceptions = []
           if self.op.master_capable:
             self.master_candidate = _DecideSelfPromotion(self, exceptions=exceptions)
           else:
             self.master_candidate = False
           if self.op.readd:
             self.new_node = old_node
           else:
             node_group = cfg.LookupNodeGroup(self.op.group)
             self.new_node = objects.Node(name=node,
                                          primary_ip=primary_ip,
                                          secondary_ip=secondary_ip,
                                          master_candidate=self.master_candidate,
                                          offline=False, drained=False,
                                          group=node_group)
           if self.op.ndparams:
             utils.ForceDictType(self.op.ndparams, constants.NDS_PARAMETER_TYPES)
         def Exec(self, feedback_fn):
           """Adds the new node to the cluster.
           """
           new_node = self.new_node
           node = new_node.name
           assert locking.BGL in self.owned_locks(locking.LEVEL_CLUSTER), \
             "Not owning BGL"
           # We adding a new node so we assume it's powered
           new_node.powered = True
           # for re-adds, reset the offline/drained/master-candidate flags;
           # we need to reset here, otherwise offline would prevent RPC calls
           # later in the procedure; this also means that if the re-add
           # fails, we are left with a non-offlined, broken node
           if self.op.readd:
             new_node.drained = new_node.offline = False # pylint: disable=W0201
             self.LogInfo("Readding a node, the offline/drained flags were reset")
             # if we demote the node, we do cleanup later in the procedure
             new_node.master_candidate = self.master_candidate
             if self.changed_primary_ip:
               new_node.primary_ip = self.op.primary_ip
           # copy the master/vm_capable flags
           for attr in self._NFLAGS:
             setattr(new_node, attr, getattr(self.op, attr))
           # notify the user about any possible mc promotion
           if new_node.master_candidate:
             self.LogInfo("Node will be a master candidate")
           if self.op.ndparams:
             new_node.ndparams = self.op.ndparams
           else:
             new_node.ndparams = {}
           # check connectivity
           result = self.rpc.call_version([node])[node]
           result.Raise("Can't get version information from node %s" % node)
           if constants.PROTOCOL_VERSION == result.payload:
             logging.info("Communication to node %s fine, sw version %s match",
                          node, result.payload)
           else:
             raise errors.OpExecError("Version mismatch master version %s,"
                                      " node version %s" %
                                      (constants.PROTOCOL_VERSION, result.payload))
           # Add node to our /etc/hosts, and add key to known_hosts
           if self.cfg.GetClusterInfo().modify_etc_hosts:
             master_node = self.cfg.GetMasterNode()
             result = self.rpc.call_etc_hosts_modify(master_node,
                                                     constants.ETC_HOSTS_ADD,
                                                     self.hostname.name,
                                                     self.hostname.ip)
             result.Raise("Can't update hosts file with new host data")
           if new_node.secondary_ip != new_node.primary_ip:
             _CheckNodeHasSecondaryIP(self, new_node.name, new_node.secondary_ip,
                                      False)
           node_verify_list = [self.cfg.GetMasterNode()]
           node_verify_param = {
             constants.NV_NODELIST: ([node], {}),
             # TODO: do a node-net-test as well?
+          }
           result = self.rpc.call_node_verify(node_verify_list, node_verify_param,
                                              self.cfg.GetClusterName())
           for verifier in node_verify_list:
             result[verifier].Raise("Cannot communicate with node %s" % verifier)
             nl_payload = result[verifier].payload[constants.NV_NODELIST]
             if nl_payload:
               for failed in nl_payload:
                 feedback_fn("ssh/hostname verification failed"
                             " (checking from %s): %s" %
                             (verifier, nl_payload[failed]))
               raise errors.OpExecError("ssh/hostname verification failed")
           if self.op.readd:
             _RedistributeAncillaryFiles(self)
             self.context.ReaddNode(new_node)
             # make sure we redistribute the config
             self.cfg.Update(new_node, feedback_fn)
             # and make sure the new node will not have old files around
             if not new_node.master_candidate:
               result = self.rpc.call_node_demote_from_mc(new_node.name)
               msg = result.fail_msg
               if msg:
                 self.LogWarning("Node failed to demote itself from master"
                                 " candidate status: %s" % msg)
           else:
             _RedistributeAncillaryFiles(self, additional_nodes=[node],
                                         additional_vm=self.op.vm_capable)
             self.context.AddNode(new_node, self.proc.GetECId())
       class LUNodeSetParams(LogicalUnit):
         """Modifies the parameters of a node.
         @cvar _F2R: a dictionary from tuples of flags (mc, drained, offline)
             to the node role (as _ROLE_*)
         @cvar _R2F: a dictionary from node role to tuples of flags
         @cvar _FLAGS: a list of attribute names corresponding to the flags
         """
         HPATH = "node-modify"
         HTYPE = constants.HTYPE_NODE
         REQ_BGL = False
         (_ROLE_CANDIDATE, _ROLE_DRAINED, _ROLE_OFFLINE, _ROLE_REGULAR) = range(4)
         _F2R = {
           (True, False, False): _ROLE_CANDIDATE,
           (False, True, False): _ROLE_DRAINED,
           (False, False, True): _ROLE_OFFLINE,
           (False, False, False): _ROLE_REGULAR,
+          }
         _R2F = dict((v, k) for k, v in _F2R.items())
         _FLAGS = ["master_candidate", "drained", "offline"]
         def CheckArguments(self):
           self.op.node_name = _ExpandNodeName(self.cfg, self.op.node_name)
           all_mods = [self.op.offline, self.op.master_candidate, self.op.drained,
                       self.op.master_capable, self.op.vm_capable,
                       self.op.secondary_ip, self.op.ndparams]
           if all_mods.count(None) == len(all_mods):
             raise errors.OpPrereqError("Please pass at least one modification",
                                        errors.ECODE_INVAL)
           if all_mods.count(True) > 1:
             raise errors.OpPrereqError("Can't set the node into more than one"
                                        " state at the same time",
                                        errors.ECODE_INVAL)
           # Boolean value that tells us whether we might be demoting from MC
           self.might_demote = (self.op.master_candidate == False or
                                self.op.offline == True or
                                self.op.drained == True or
                                self.op.master_capable == False)
           if self.op.secondary_ip:
             if not netutils.IP4Address.IsValid(self.op.secondary_ip):
               raise errors.OpPrereqError("Secondary IP (%s) needs to be a valid IPv4"
                                          " address" % self.op.secondary_ip,
                                          errors.ECODE_INVAL)
           self.lock_all = self.op.auto_promote and self.might_demote
           self.lock_instances = self.op.secondary_ip is not None
         def _InstanceFilter(self, instance):
           """Filter for getting affected instances.
           """
           return (instance.disk_template in constants.DTS_INT_MIRROR and
                   self.op.node_name in instance.all_nodes)
         def ExpandNames(self):
           if self.lock_all:
             self.needed_locks = {locking.LEVEL_NODE: locking.ALL_SET}
           else:
             self.needed_locks = {locking.LEVEL_NODE: self.op.node_name}
           # Since modifying a node can have severe effects on currently running
           # operations the resource lock is at least acquired in shared mode
           self.needed_locks[locking.LEVEL_NODE_RES] = \
             self.needed_locks[locking.LEVEL_NODE]
           # Get node resource and instance locks in shared mode; they are not used
           # for anything but read-only access
           self.share_locks[locking.LEVEL_NODE_RES] = 1
           self.share_locks[locking.LEVEL_INSTANCE] = 1
           if self.lock_instances:
             self.needed_locks[locking.LEVEL_INSTANCE] = \
               frozenset(self.cfg.GetInstancesInfoByFilter(self._InstanceFilter))
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on the master node.
           """
           return {
             "OP_TARGET": self.op.node_name,
             "MASTER_CANDIDATE": str(self.op.master_candidate),
             "OFFLINE": str(self.op.offline),
             "DRAINED": str(self.op.drained),
             "MASTER_CAPABLE": str(self.op.master_capable),
             "VM_CAPABLE": str(self.op.vm_capable),
+            }
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           nl = [self.cfg.GetMasterNode(), self.op.node_name]
           return (nl, nl)
         def CheckPrereq(self):
           """Check prerequisites.
           This only checks the instance list against the existing names.
           """
           node = self.node = self.cfg.GetNodeInfo(self.op.node_name)
           if self.lock_instances:
             affected_instances = \
               self.cfg.GetInstancesInfoByFilter(self._InstanceFilter)
             # Verify instance locks
             owned_instances = self.owned_locks(locking.LEVEL_INSTANCE)
             wanted_instances = frozenset(affected_instances.keys())
             if wanted_instances - owned_instances:
               raise errors.OpPrereqError("Instances affected by changing node %s's"
                                          " secondary IP address have changed since"
                                          " locks were acquired, wanted '%s', have"
                                          " '%s'; retry the operation" %
                                          (self.op.node_name,
                                           utils.CommaJoin(wanted_instances),
                                           utils.CommaJoin(owned_instances)),
                                          errors.ECODE_STATE)
           else:
             affected_instances = None
           if (self.op.master_candidate is not None or
               self.op.drained is not None or
               self.op.offline is not None):
             # we can't change the master's node flags
             if self.op.node_name == self.cfg.GetMasterNode():
               raise errors.OpPrereqError("The master role can be changed"
                                          " only via master-failover",
                                          errors.ECODE_INVAL)
           if self.op.master_candidate and not node.master_capable:
             raise errors.OpPrereqError("Node %s is not master capable, cannot make"
                                        " it a master candidate" % node.name,
                                        errors.ECODE_STATE)
           if self.op.vm_capable == False:
             (ipri, isec) = self.cfg.GetNodeInstances(self.op.node_name)
             if ipri or isec:
               raise errors.OpPrereqError("Node %s hosts instances, cannot unset"
                                          " the vm_capable flag" % node.name,
                                          errors.ECODE_STATE)
           if node.master_candidate and self.might_demote and not self.lock_all:
             assert not self.op.auto_promote, "auto_promote set but lock_all not"
             # check if after removing the current node, we're missing master
             # candidates
             (mc_remaining, mc_should, _) = \
                 self.cfg.GetMasterCandidateStats(exceptions=[node.name])
             if mc_remaining < mc_should:
               raise errors.OpPrereqError("Not enough master candidates, please"
                                          " pass auto promote option to allow"
                                          " promotion", errors.ECODE_STATE)
           self.old_flags = old_flags = (node.master_candidate,
                                         node.drained, node.offline)
           assert old_flags in self._F2R, "Un-handled old flags %s" % str(old_flags)
           self.old_role = old_role = self._F2R[old_flags]
           # Check for ineffective changes
           for attr in self._FLAGS:
             if (getattr(self.op, attr) == False and getattr(node, attr) == False):
               self.LogInfo("Ignoring request to unset flag %s, already unset", attr)
               setattr(self.op, attr, None)
           # Past this point, any flag change to False means a transition
           # away from the respective state, as only real changes are kept
           # TODO: We might query the real power state if it supports OOB
           if _SupportsOob(self.cfg, node):
             if self.op.offline is False and not (node.powered or
                                                  self.op.powered == True):
               raise errors.OpPrereqError(("Node %s needs to be turned on before its"
                                           " offline status can be reset") %
                                          self.op.node_name)
           elif self.op.powered is not None:
             raise errors.OpPrereqError(("Unable to change powered state for node %s"
                                         " as it does not support out-of-band"
                                         " handling") % self.op.node_name)
           # If we're being deofflined/drained, we'll MC ourself if needed
           if (self.op.drained == False or self.op.offline == False or
               (self.op.master_capable and not node.master_capable)):
             if _DecideSelfPromotion(self):
               self.op.master_candidate = True
               self.LogInfo("Auto-promoting node to master candidate")
           # If we're no longer master capable, we'll demote ourselves from MC
           if self.op.master_capable == False and node.master_candidate:
             self.LogInfo("Demoting from master candidate")
             self.op.master_candidate = False
           # Compute new role
           assert [getattr(self.op, attr) for attr in self._FLAGS].count(True) <= 1
           if self.op.master_candidate:
             new_role = self._ROLE_CANDIDATE
           elif self.op.drained:
             new_role = self._ROLE_DRAINED
           elif self.op.offline:
             new_role = self._ROLE_OFFLINE
           elif False in [self.op.master_candidate, self.op.drained, self.op.offline]:
             # False is still in new flags, which means we're un-setting (the
             # only) True flag
             new_role = self._ROLE_REGULAR
           else: # no new flags, nothing, keep old role
             new_role = old_role
           self.new_role = new_role
           if old_role == self._ROLE_OFFLINE and new_role != old_role:
             # Trying to transition out of offline status
             # TODO: Use standard RPC runner, but make sure it works when the node is
             # still marked offline
             result = rpc.BootstrapRunner().call_version([node.name])[node.name]
             if result.fail_msg:
               raise errors.OpPrereqError("Node %s is being de-offlined but fails"
                                          " to report its version: %s" %
                                          (node.name, result.fail_msg),
                                          errors.ECODE_STATE)
             else:
               self.LogWarning("Transitioning node from offline to online state"
                               " without using re-add. Please make sure the node"
                               " is healthy!")
           if self.op.secondary_ip:
             # Ok even without locking, because this can't be changed by any LU
             master = self.cfg.GetNodeInfo(self.cfg.GetMasterNode())
             master_singlehomed = master.secondary_ip == master.primary_ip
             if master_singlehomed and self.op.secondary_ip:
               raise errors.OpPrereqError("Cannot change the secondary ip on a single"
                                          " homed cluster", errors.ECODE_INVAL)
             assert not (frozenset(affected_instances) -
                         self.owned_locks(locking.LEVEL_INSTANCE))
             if node.offline:
               if affected_instances:
                 raise errors.OpPrereqError("Cannot change secondary IP address:"
                                            " offline node has instances (%s)"
                                            " configured to use it" %
                                            utils.CommaJoin(affected_instances.keys()))
             else:
               # On online nodes, check that no instances are running, and that
               # the node has the new ip and we can reach it.
               for instance in affected_instances.values():
                 _CheckInstanceState(self, instance, INSTANCE_DOWN,
                                     msg="cannot change secondary ip")
               _CheckNodeHasSecondaryIP(self, node.name, self.op.secondary_ip, True)
               if master.name != node.name:
                 # check reachability from master secondary ip to new secondary ip
                 if not netutils.TcpPing(self.op.secondary_ip,
                                         constants.DEFAULT_NODED_PORT,
                                         source=master.secondary_ip):
                   raise errors.OpPrereqError("Node secondary ip not reachable by TCP"
                                              " based ping to node daemon port",
                                              errors.ECODE_ENVIRON)
           if self.op.ndparams:
             new_ndparams = _GetUpdatedParams(self.node.ndparams, self.op.ndparams)
             utils.ForceDictType(new_ndparams, constants.NDS_PARAMETER_TYPES)
             self.new_ndparams = new_ndparams
         def Exec(self, feedback_fn):
           """Modifies a node.
           """
           node = self.node
           old_role = self.old_role
           new_role = self.new_role
           result = []
           if self.op.ndparams:
             node.ndparams = self.new_ndparams
           if self.op.powered is not None:
             node.powered = self.op.powered
           for attr in ["master_capable", "vm_capable"]:
             val = getattr(self.op, attr)
             if val is not None:
               setattr(node, attr, val)
               result.append((attr, str(val)))
           if new_role != old_role:
             # Tell the node to demote itself, if no longer MC and not offline
             if old_role == self._ROLE_CANDIDATE and new_role != self._ROLE_OFFLINE:
               msg = self.rpc.call_node_demote_from_mc(node.name).fail_msg
               if msg:
                 self.LogWarning("Node failed to demote itself: %s", msg)
             new_flags = self._R2F[new_role]
             for of, nf, desc in zip(self.old_flags, new_flags, self._FLAGS):
               if of != nf:
                 result.append((desc, str(nf)))
             (node.master_candidate, node.drained, node.offline) = new_flags
             # we locked all nodes, we adjust the CP before updating this node
             if self.lock_all:
               _AdjustCandidatePool(self, [node.name])
           if self.op.secondary_ip:
             node.secondary_ip = self.op.secondary_ip
             result.append(("secondary_ip", self.op.secondary_ip))
           # this will trigger configuration file update, if needed
           self.cfg.Update(node, feedback_fn)
           # this will trigger job queue propagation or cleanup if the mc
           # flag changed
           if [old_role, new_role].count(self._ROLE_CANDIDATE) == 1:
             self.context.ReaddNode(node)
           return result
       class LUNodePowercycle(NoHooksLU):
         """Powercycles a node.
         """
         REQ_BGL = False
         def CheckArguments(self):
           self.op.node_name = _ExpandNodeName(self.cfg, self.op.node_name)
           if self.op.node_name == self.cfg.GetMasterNode() and not self.op.force:
             raise errors.OpPrereqError("The node is the master and the force"
                                        " parameter was not set",
                                        errors.ECODE_INVAL)
         def ExpandNames(self):
           """Locking for PowercycleNode.
           This is a last-resort option and shouldn't block on other
           jobs. Therefore, we grab no locks.
           """
           self.needed_locks = {}
         def Exec(self, feedback_fn):
           """Reboots a node.
           """
           result = self.rpc.call_node_powercycle(self.op.node_name,
                                                  self.cfg.GetHypervisorType())
           result.Raise("Failed to schedule the reboot")
           return result.payload
       class LUClusterQuery(NoHooksLU):
         """Query cluster configuration.
         """
         REQ_BGL = False
         def ExpandNames(self):
           self.needed_locks = {}
         def Exec(self, feedback_fn):
           """Return cluster config.
           """
           cluster = self.cfg.GetClusterInfo()
           os_hvp = {}
           # Filter just for enabled hypervisors
           for os_name, hv_dict in cluster.os_hvp.items():
             os_hvp[os_name] = {}
             for hv_name, hv_params in hv_dict.items():
               if hv_name in cluster.enabled_hypervisors:
                 os_hvp[os_name][hv_name] = hv_params
           # Convert ip_family to ip_version
           primary_ip_version = constants.IP4_VERSION
           if cluster.primary_ip_family == netutils.IP6Address.family:
             primary_ip_version = constants.IP6_VERSION
           result = {
             "software_version": constants.RELEASE_VERSION,
             "protocol_version": constants.PROTOCOL_VERSION,
             "config_version": constants.CONFIG_VERSION,
             "os_api_version": max(constants.OS_API_VERSIONS),
             "export_version": constants.EXPORT_VERSION,
             "architecture": (platform.architecture()[0], platform.machine()),
             "name": cluster.cluster_name,
             "master": cluster.master_node,
             "default_hypervisor": cluster.primary_hypervisor,
             "enabled_hypervisors": cluster.enabled_hypervisors,
             "hvparams": dict([(hypervisor_name, cluster.hvparams[hypervisor_name])
                               for hypervisor_name in cluster.enabled_hypervisors]),
             "os_hvp": os_hvp,
             "beparams": cluster.beparams,
             "osparams": cluster.osparams,
             "nicparams": cluster.nicparams,
             "ndparams": cluster.ndparams,
             "candidate_pool_size": cluster.candidate_pool_size,
             "master_netdev": cluster.master_netdev,
             "master_netmask": cluster.master_netmask,
             "use_external_mip_script": cluster.use_external_mip_script,
             "volume_group_name": cluster.volume_group_name,
             "drbd_usermode_helper": cluster.drbd_usermode_helper,
             "file_storage_dir": cluster.file_storage_dir,
             "shared_file_storage_dir": cluster.shared_file_storage_dir,
             "maintain_node_health": cluster.maintain_node_health,
             "ctime": cluster.ctime,
             "mtime": cluster.mtime,
             "uuid": cluster.uuid,
             "tags": list(cluster.GetTags()),
             "uid_pool": cluster.uid_pool,
             "default_iallocator": cluster.default_iallocator,
             "reserved_lvs": cluster.reserved_lvs,
             "primary_ip_version": primary_ip_version,
             "prealloc_wipe_disks": cluster.prealloc_wipe_disks,
             "hidden_os": cluster.hidden_os,
             "blacklisted_os": cluster.blacklisted_os,
+            }
           return result
       class LUClusterConfigQuery(NoHooksLU):
         """Return configuration values.
         """
         REQ_BGL = False
         _FIELDS_DYNAMIC = utils.FieldSet()
         _FIELDS_STATIC = utils.FieldSet("cluster_name", "master_node", "drain_flag",
                                         "watcher_pause", "volume_group_name")
         def CheckArguments(self):
           _CheckOutputFields(static=self._FIELDS_STATIC,
                              dynamic=self._FIELDS_DYNAMIC,
                              selected=self.op.output_fields)
         def ExpandNames(self):
           self.needed_locks = {}
         def Exec(self, feedback_fn):
           """Dump a representation of the cluster config to the standard output.
           """
           values = []
           for field in self.op.output_fields:
             if field == "cluster_name":
               entry = self.cfg.GetClusterName()
             elif field == "master_node":
               entry = self.cfg.GetMasterNode()
             elif field == "drain_flag":
               entry = os.path.exists(constants.JOB_QUEUE_DRAIN_FILE)
             elif field == "watcher_pause":
               entry = utils.ReadWatcherPauseFile(constants.WATCHER_PAUSEFILE)
             elif field == "volume_group_name":
               entry = self.cfg.GetVGName()
             else:
               raise errors.ParameterError(field)
             values.append(entry)
           return values
       class LUInstanceActivateDisks(NoHooksLU):
         """Bring up an instance's disks.
         """
         REQ_BGL = False
         def ExpandNames(self):
           self._ExpandAndLockInstance()
           self.needed_locks[locking.LEVEL_NODE] = []
           self.recalculate_locks[locking.LEVEL_NODE] = constants.LOCKS_REPLACE
         def DeclareLocks(self, level):
           if level == locking.LEVEL_NODE:
             self._LockInstancesNodes()
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the instance is in the cluster.
           """
           self.instance = self.cfg.GetInstanceInfo(self.op.instance_name)
           assert self.instance is not None, \
             "Cannot retrieve locked instance %s" % self.op.instance_name
           _CheckNodeOnline(self, self.instance.primary_node)
         def Exec(self, feedback_fn):
           """Activate the disks.
           """
           disks_ok, disks_info = \
                     _AssembleInstanceDisks(self, self.instance,
                                            ignore_size=self.op.ignore_size)
           if not disks_ok:
             raise errors.OpExecError("Cannot activate block devices")
           return disks_info
       def _AssembleInstanceDisks(lu, instance, disks=None, ignore_secondaries=False,
                                  ignore_size=False):
         """Prepare the block devices for an instance.
         This sets up the block devices on all nodes.
         @type lu: L{LogicalUnit}
         @param lu: the logical unit on whose behalf we execute
         @type instance: L{objects.Instance}
         @param instance: the instance for whose disks we assemble
         @type disks: list of L{objects.Disk} or None
         @param disks: which disks to assemble (or all, if None)
         @type ignore_secondaries: boolean
         @param ignore_secondaries: if true, errors on secondary nodes
             won't result in an error return from the function
         @type ignore_size: boolean
         @param ignore_size: if true, the current known size of the disk
             will not be used during the disk activation, useful for cases
             when the size is wrong
         @return: False if the operation failed, otherwise a list of
             (host, instance_visible_name, node_visible_name)
             with the mapping from node devices to instance devices
         """
         device_info = []
         disks_ok = True
         iname = instance.name
         disks = _ExpandCheckDisks(instance, disks)
         # With the two passes mechanism we try to reduce the window of
         # opportunity for the race condition of switching DRBD to primary
         # before handshaking occured, but we do not eliminate it
         # The proper fix would be to wait (with some limits) until the
         # connection has been made and drbd transitions from WFConnection
         # into any other network-connected state (Connected, SyncTarget,
         # SyncSource, etc.)
         # 1st pass, assemble on all nodes in secondary mode
         for idx, inst_disk in enumerate(disks):
           for node, node_disk in inst_disk.ComputeNodeTree(instance.primary_node):
             if ignore_size:
               node_disk = node_disk.Copy()
               node_disk.UnsetSize()
             lu.cfg.SetDiskID(node_disk, node)
             result = lu.rpc.call_blockdev_assemble(node, node_disk, iname, False, idx)
             msg = result.fail_msg
             if msg:
               lu.proc.LogWarning("Could not prepare block device %s on node %s"
                                  " (is_primary=False, pass=1): %s",
                                  inst_disk.iv_name, node, msg)
               if not ignore_secondaries:
                 disks_ok = False
         # FIXME: race condition on drbd migration to primary
         # 2nd pass, do only the primary node
         for idx, inst_disk in enumerate(disks):
           dev_path = None
           for node, node_disk in inst_disk.ComputeNodeTree(instance.primary_node):
             if node != instance.primary_node:
               continue
             if ignore_size:
               node_disk = node_disk.Copy()
               node_disk.UnsetSize()
             lu.cfg.SetDiskID(node_disk, node)
             result = lu.rpc.call_blockdev_assemble(node, node_disk, iname, True, idx)
             msg = result.fail_msg
             if msg:
               lu.proc.LogWarning("Could not prepare block device %s on node %s"
                                  " (is_primary=True, pass=2): %s",
                                  inst_disk.iv_name, node, msg)
               disks_ok = False
             else:
               dev_path = result.payload
           device_info.append((instance.primary_node, inst_disk.iv_name, dev_path))
         # leave the disks configured for the primary node
         # this is a workaround that would be fixed better by
         # improving the logical/physical id handling
         for disk in disks:
           lu.cfg.SetDiskID(disk, instance.primary_node)
         return disks_ok, device_info
       def _StartInstanceDisks(lu, instance, force):
         """Start the disks of an instance.
         """
         disks_ok, _ = _AssembleInstanceDisks(lu, instance,
                                                  ignore_secondaries=force)
         if not disks_ok:
           _ShutdownInstanceDisks(lu, instance)
           if force is not None and not force:
             lu.proc.LogWarning("", hint="If the message above refers to a"
                                " secondary node,"
                                " you can retry the operation using '--force'.")
           raise errors.OpExecError("Disk consistency error")
       class LUInstanceDeactivateDisks(NoHooksLU):
         """Shutdown an instance's disks.
         """
         REQ_BGL = False
         def ExpandNames(self):
           self._ExpandAndLockInstance()
           self.needed_locks[locking.LEVEL_NODE] = []
           self.recalculate_locks[locking.LEVEL_NODE] = constants.LOCKS_REPLACE
         def DeclareLocks(self, level):
           if level == locking.LEVEL_NODE:
             self._LockInstancesNodes()
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the instance is in the cluster.
           """
           self.instance = self.cfg.GetInstanceInfo(self.op.instance_name)
           assert self.instance is not None, \
             "Cannot retrieve locked instance %s" % self.op.instance_name
         def Exec(self, feedback_fn):
           """Deactivate the disks
           """
           instance = self.instance
           if self.op.force:
             _ShutdownInstanceDisks(self, instance)
           else:
             _SafeShutdownInstanceDisks(self, instance)
       def _SafeShutdownInstanceDisks(lu, instance, disks=None):
         """Shutdown block devices of an instance.
         This function checks if an instance is running, before calling
         _ShutdownInstanceDisks.
         """
         _CheckInstanceState(lu, instance, INSTANCE_DOWN, msg="cannot shutdown disks")
         _ShutdownInstanceDisks(lu, instance, disks=disks)
       def _ExpandCheckDisks(instance, disks):
         """Return the instance disks selected by the disks list
         @type disks: list of L{objects.Disk} or None
         @param disks: selected disks
         @rtype: list of L{objects.Disk}
         @return: selected instance disks to act on
         """
         if disks is None:
           return instance.disks
         else:
           if not set(disks).issubset(instance.disks):
             raise errors.ProgrammerError("Can only act on disks belonging to the"
                                          " target instance")
           return disks
       def _ShutdownInstanceDisks(lu, instance, disks=None, ignore_primary=False):
         """Shutdown block devices of an instance.
         This does the shutdown on all nodes of the instance.
         If the ignore_primary is false, errors on the primary node are
         ignored.
         """
         all_result = True
         disks = _ExpandCheckDisks(instance, disks)
         for disk in disks:
           for node, top_disk in disk.ComputeNodeTree(instance.primary_node):
             lu.cfg.SetDiskID(top_disk, node)
             result = lu.rpc.call_blockdev_shutdown(node, top_disk)
             msg = result.fail_msg
             if msg:
               lu.LogWarning("Could not shutdown block device %s on node %s: %s",
                             disk.iv_name, node, msg)
               if ((node == instance.primary_node and not ignore_primary) or
                   (node != instance.primary_node and not result.offline)):
                 all_result = False
         return all_result
       def _CheckNodeFreeMemory(lu, node, reason, requested, hypervisor_name):
         """Checks if a node has enough free memory.
         This function check if a given node has the needed amount of free
         memory. In case the node has less memory or we cannot get the
         information from the node, this function raise an OpPrereqError
         exception.
         @type lu: C{LogicalUnit}
         @param lu: a logical unit from which we get configuration data
         @type node: C{str}
         @param node: the node to check
         @type reason: C{str}
         @param reason: string to use in the error message
         @type requested: C{int}
         @param requested: the amount of memory in MiB to check for
         @type hypervisor_name: C{str}
         @param hypervisor_name: the hypervisor to ask for memory stats
         @raise errors.OpPrereqError: if the node doesn't have enough memory, or
             we cannot check the node
         """
         nodeinfo = lu.rpc.call_node_info([node], None, [hypervisor_name])
         nodeinfo[node].Raise("Can't get data from node %s" % node,
                              prereq=True, ecode=errors.ECODE_ENVIRON)
         (_, _, (hv_info, )) = nodeinfo[node].payload
         free_mem = hv_info.get("memory_free", None)
         if not isinstance(free_mem, int):
           raise errors.OpPrereqError("Can't compute free memory on node %s, result"
                                      " was '%s'" % (node, free_mem),
                                      errors.ECODE_ENVIRON)
         if requested > free_mem:
           raise errors.OpPrereqError("Not enough memory on node %s for %s:"
                                      " needed %s MiB, available %s MiB" %
                                      (node, reason, requested, free_mem),
                                      errors.ECODE_NORES)
       def _CheckNodesFreeDiskPerVG(lu, nodenames, req_sizes):
         """Checks if nodes have enough free disk space in the all VGs.
         This function check if all given nodes have the needed amount of
         free disk. In case any node has less disk or we cannot get the
         information from the node, this function raise an OpPrereqError
         exception.
         @type lu: C{LogicalUnit}
         @param lu: a logical unit from which we get configuration data
         @type nodenames: C{list}
         @param nodenames: the list of node names to check
         @type req_sizes: C{dict}
         @param req_sizes: the hash of vg and corresponding amount of disk in
             MiB to check for
         @raise errors.OpPrereqError: if the node doesn't have enough disk,
             or we cannot check the node
         """
         for vg, req_size in req_sizes.items():
           _CheckNodesFreeDiskOnVG(lu, nodenames, vg, req_size)
       def _CheckNodesFreeDiskOnVG(lu, nodenames, vg, requested):
         """Checks if nodes have enough free disk space in the specified VG.
         This function check if all given nodes have the needed amount of
         free disk. In case any node has less disk or we cannot get the
         information from the node, this function raise an OpPrereqError
         exception.
         @type lu: C{LogicalUnit}
         @param lu: a logical unit from which we get configuration data
         @type nodenames: C{list}
         @param nodenames: the list of node names to check
         @type vg: C{str}
         @param vg: the volume group to check
         @type requested: C{int}
         @param requested: the amount of disk in MiB to check for
         @raise errors.OpPrereqError: if the node doesn't have enough disk,
             or we cannot check the node
         """
         nodeinfo = lu.rpc.call_node_info(nodenames, [vg], None)
         for node in nodenames:
           info = nodeinfo[node]
           info.Raise("Cannot get current information from node %s" % node,
                      prereq=True, ecode=errors.ECODE_ENVIRON)
           (_, (vg_info, ), _) = info.payload
           vg_free = vg_info.get("vg_free", None)
           if not isinstance(vg_free, int):
             raise errors.OpPrereqError("Can't compute free disk space on node"
                                        " %s for vg %s, result was '%s'" %
                                        (node, vg, vg_free), errors.ECODE_ENVIRON)
           if requested > vg_free:
             raise errors.OpPrereqError("Not enough disk space on target node %s"
                                        " vg %s: required %d MiB, available %d MiB" %
                                        (node, vg, requested, vg_free),
                                        errors.ECODE_NORES)
       def _CheckNodesPhysicalCPUs(lu, nodenames, requested, hypervisor_name):
         """Checks if nodes have enough physical CPUs
         This function checks if all given nodes have the needed number of
         physical CPUs. In case any node has less CPUs or we cannot get the
         information from the node, this function raises an OpPrereqError
         exception.
         @type lu: C{LogicalUnit}
         @param lu: a logical unit from which we get configuration data
         @type nodenames: C{list}
         @param nodenames: the list of node names to check
         @type requested: C{int}
         @param requested: the minimum acceptable number of physical CPUs
         @raise errors.OpPrereqError: if the node doesn't have enough CPUs,
             or we cannot check the node
         """
         nodeinfo = lu.rpc.call_node_info(nodenames, None, [hypervisor_name])
         for node in nodenames:
           info = nodeinfo[node]
           info.Raise("Cannot get current information from node %s" % node,
                      prereq=True, ecode=errors.ECODE_ENVIRON)
           (_, _, (hv_info, )) = info.payload
           num_cpus = hv_info.get("cpu_total", None)
           if not isinstance(num_cpus, int):
             raise errors.OpPrereqError("Can't compute the number of physical CPUs"
                                        " on node %s, result was '%s'" %
                                        (node, num_cpus), errors.ECODE_ENVIRON)
           if requested > num_cpus:
             raise errors.OpPrereqError("Node %s has %s physical CPUs, but %s are "
                                        "required" % (node, num_cpus, requested),
                                        errors.ECODE_NORES)
       class LUInstanceStartup(LogicalUnit):
         """Starts an instance.
         """
         HPATH = "instance-start"
         HTYPE = constants.HTYPE_INSTANCE
         REQ_BGL = False
         def CheckArguments(self):
           # extra beparams
           if self.op.beparams:
             # fill the beparams dict
             objects.UpgradeBeParams(self.op.beparams)
             utils.ForceDictType(self.op.beparams, constants.BES_PARAMETER_TYPES)
         def ExpandNames(self):
           self._ExpandAndLockInstance()
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on master, primary and secondary nodes of the instance.
           """
           env = {
             "FORCE": self.op.force,
+            }
           env.update(_BuildInstanceHookEnvByObject(self, self.instance))
           return env
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           nl = [self.cfg.GetMasterNode()] + list(self.instance.all_nodes)
           return (nl, nl)
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the instance is in the cluster.
           """
           self.instance = instance = self.cfg.GetInstanceInfo(self.op.instance_name)
           assert self.instance is not None, \
             "Cannot retrieve locked instance %s" % self.op.instance_name
           # extra hvparams
           if self.op.hvparams:
             # check hypervisor parameter syntax (locally)
             cluster = self.cfg.GetClusterInfo()
             utils.ForceDictType(self.op.hvparams, constants.HVS_PARAMETER_TYPES)
             filled_hvp = cluster.FillHV(instance)
             filled_hvp.update(self.op.hvparams)
             hv_type = hypervisor.GetHypervisor(instance.hypervisor)
             hv_type.CheckParameterSyntax(filled_hvp)
             _CheckHVParams(self, instance.all_nodes, instance.hypervisor, filled_hvp)
           _CheckInstanceState(self, instance, INSTANCE_ONLINE)
           self.primary_offline = self.cfg.GetNodeInfo(instance.primary_node).offline
           if self.primary_offline and self.op.ignore_offline_nodes:
             self.proc.LogWarning("Ignoring offline primary node")
             if self.op.hvparams or self.op.beparams:
               self.proc.LogWarning("Overridden parameters are ignored")
           else:
             _CheckNodeOnline(self, instance.primary_node)
             bep = self.cfg.GetClusterInfo().FillBE(instance)
             # check bridges existence
             _CheckInstanceBridgesExist(self, instance)
             remote_info = self.rpc.call_instance_info(instance.primary_node,
                                                       instance.name,
                                                       instance.hypervisor)
             remote_info.Raise("Error checking node %s" % instance.primary_node,
                               prereq=True, ecode=errors.ECODE_ENVIRON)
             if not remote_info.payload: # not running already
               _CheckNodeFreeMemory(self, instance.primary_node,
                                    "starting instance %s" % instance.name,
                                    bep[constants.BE_MAXMEM], instance.hypervisor)
         def Exec(self, feedback_fn):
           """Start the instance.
           """
           instance = self.instance
           force = self.op.force
           if not self.op.no_remember:
             self.cfg.MarkInstanceUp(instance.name)
           if self.primary_offline:
             assert self.op.ignore_offline_nodes
             self.proc.LogInfo("Primary node offline, marked instance as started")
           else:
             node_current = instance.primary_node
             _StartInstanceDisks(self, instance, force)
             result = \
               self.rpc.call_instance_start(node_current,
                                            (instance, self.op.hvparams,
                                             self.op.beparams),
                                            self.op.startup_paused)
             msg = result.fail_msg
             if msg:
               _ShutdownInstanceDisks(self, instance)
               raise errors.OpExecError("Could not start instance: %s" % msg)
       class LUInstanceReboot(LogicalUnit):
         """Reboot an instance.
         """
         HPATH = "instance-reboot"
         HTYPE = constants.HTYPE_INSTANCE
         REQ_BGL = False
         def ExpandNames(self):
           self._ExpandAndLockInstance()
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on master, primary and secondary nodes of the instance.
           """
           env = {
             "IGNORE_SECONDARIES": self.op.ignore_secondaries,
             "REBOOT_TYPE": self.op.reboot_type,
             "SHUTDOWN_TIMEOUT": self.op.shutdown_timeout,
+            }
           env.update(_BuildInstanceHookEnvByObject(self, self.instance))
           return env
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           nl = [self.cfg.GetMasterNode()] + list(self.instance.all_nodes)
           return (nl, nl)
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the instance is in the cluster.
           """
           self.instance = instance = self.cfg.GetInstanceInfo(self.op.instance_name)
           assert self.instance is not None, \
             "Cannot retrieve locked instance %s" % self.op.instance_name
           _CheckInstanceState(self, instance, INSTANCE_ONLINE)
           _CheckNodeOnline(self, instance.primary_node)
           # check bridges existence
           _CheckInstanceBridgesExist(self, instance)
         def Exec(self, feedback_fn):
           """Reboot the instance.
           """
           instance = self.instance
           ignore_secondaries = self.op.ignore_secondaries
           reboot_type = self.op.reboot_type
           remote_info = self.rpc.call_instance_info(instance.primary_node,
                                                     instance.name,
                                                     instance.hypervisor)
           remote_info.Raise("Error checking node %s" % instance.primary_node)
           instance_running = bool(remote_info.payload)
           node_current = instance.primary_node
           if instance_running and reboot_type in [constants.INSTANCE_REBOOT_SOFT,
                                                   constants.INSTANCE_REBOOT_HARD]:
             for disk in instance.disks:
               self.cfg.SetDiskID(disk, node_current)
             result = self.rpc.call_instance_reboot(node_current, instance,
                                                    reboot_type,
                                                    self.op.shutdown_timeout)
             result.Raise("Could not reboot instance")
           else:
             if instance_running:
               result = self.rpc.call_instance_shutdown(node_current, instance,
                                                        self.op.shutdown_timeout)
               result.Raise("Could not shutdown instance for full reboot")
               _ShutdownInstanceDisks(self, instance)
             else:
               self.LogInfo("Instance %s was already stopped, starting now",
                            instance.name)
             _StartInstanceDisks(self, instance, ignore_secondaries)
             result = self.rpc.call_instance_start(node_current,
                                                   (instance, None, None), False)
             msg = result.fail_msg
             if msg:
               _ShutdownInstanceDisks(self, instance)
               raise errors.OpExecError("Could not start instance for"
                                        " full reboot: %s" % msg)
           self.cfg.MarkInstanceUp(instance.name)
       class LUInstanceShutdown(LogicalUnit):
         """Shutdown an instance.
         """
         HPATH = "instance-stop"
         HTYPE = constants.HTYPE_INSTANCE
         REQ_BGL = False
         def ExpandNames(self):
           self._ExpandAndLockInstance()
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on master, primary and secondary nodes of the instance.
           """
           env = _BuildInstanceHookEnvByObject(self, self.instance)
           env["TIMEOUT"] = self.op.timeout
           return env
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           nl = [self.cfg.GetMasterNode()] + list(self.instance.all_nodes)
           return (nl, nl)
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the instance is in the cluster.
           """
           self.instance = self.cfg.GetInstanceInfo(self.op.instance_name)
           assert self.instance is not None, \
             "Cannot retrieve locked instance %s" % self.op.instance_name
           _CheckInstanceState(self, self.instance, INSTANCE_ONLINE)
           self.primary_offline = \
             self.cfg.GetNodeInfo(self.instance.primary_node).offline
           if self.primary_offline and self.op.ignore_offline_nodes:
             self.proc.LogWarning("Ignoring offline primary node")
           else:
             _CheckNodeOnline(self, self.instance.primary_node)
         def Exec(self, feedback_fn):
           """Shutdown the instance.
           """
           instance = self.instance
           node_current = instance.primary_node
           timeout = self.op.timeout
           if not self.op.no_remember:
             self.cfg.MarkInstanceDown(instance.name)
           if self.primary_offline:
             assert self.op.ignore_offline_nodes
             self.proc.LogInfo("Primary node offline, marked instance as stopped")
           else:
             result = self.rpc.call_instance_shutdown(node_current, instance, timeout)
             msg = result.fail_msg
             if msg:
               self.proc.LogWarning("Could not shutdown instance: %s" % msg)
             _ShutdownInstanceDisks(self, instance)
       class LUInstanceReinstall(LogicalUnit):
         """Reinstall an instance.
         """
         HPATH = "instance-reinstall"
         HTYPE = constants.HTYPE_INSTANCE
         REQ_BGL = False
         def ExpandNames(self):
           self._ExpandAndLockInstance()
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on master, primary and secondary nodes of the instance.
           """
           return _BuildInstanceHookEnvByObject(self, self.instance)
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           nl = [self.cfg.GetMasterNode()] + list(self.instance.all_nodes)
           return (nl, nl)
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the instance is in the cluster and is not running.
           """
           instance = self.cfg.GetInstanceInfo(self.op.instance_name)
           assert instance is not None, \
             "Cannot retrieve locked instance %s" % self.op.instance_name
           _CheckNodeOnline(self, instance.primary_node, "Instance primary node"
                            " offline, cannot reinstall")
           for node in instance.secondary_nodes:
             _CheckNodeOnline(self, node, "Instance secondary node offline,"
                              " cannot reinstall")
           if instance.disk_template == constants.DT_DISKLESS:
             raise errors.OpPrereqError("Instance '%s' has no disks" %
                                        self.op.instance_name,
                                        errors.ECODE_INVAL)
           _CheckInstanceState(self, instance, INSTANCE_DOWN, msg="cannot reinstall")
           if self.op.os_type is not None:
             # OS verification
             pnode = _ExpandNodeName(self.cfg, instance.primary_node)
             _CheckNodeHasOS(self, pnode, self.op.os_type, self.op.force_variant)
             instance_os = self.op.os_type
           else:
             instance_os = instance.os
           nodelist = list(instance.all_nodes)
           if self.op.osparams:
             i_osdict = _GetUpdatedParams(instance.osparams, self.op.osparams)
             _CheckOSParams(self, True, nodelist, instance_os, i_osdict)
             self.os_inst = i_osdict # the new dict (without defaults)
           else:
             self.os_inst = None
           self.instance = instance
         def Exec(self, feedback_fn):
           """Reinstall the instance.
           """
           inst = self.instance
           if self.op.os_type is not None:
             feedback_fn("Changing OS to '%s'..." % self.op.os_type)
             inst.os = self.op.os_type
             # Write to configuration
             self.cfg.Update(inst, feedback_fn)
           _StartInstanceDisks(self, inst, None)
           try:
             feedback_fn("Running the instance OS create scripts...")
             # FIXME: pass debug option from opcode to backend
             result = self.rpc.call_instance_os_add(inst.primary_node,
                                                    (inst, self.os_inst), True,
                                                    self.op.debug_level)
             result.Raise("Could not install OS for instance %s on node %s" %
                          (inst.name, inst.primary_node))
           finally:
             _ShutdownInstanceDisks(self, inst)
       class LUInstanceRecreateDisks(LogicalUnit):
         """Recreate an instance's missing disks.
         """
         HPATH = "instance-recreate-disks"
         HTYPE = constants.HTYPE_INSTANCE
         REQ_BGL = False
         def CheckArguments(self):
           # normalise the disk list
           self.op.disks = sorted(frozenset(self.op.disks))
         def ExpandNames(self):
           self._ExpandAndLockInstance()
           self.recalculate_locks[locking.LEVEL_NODE] = constants.LOCKS_APPEND
           if self.op.nodes:
             self.op.nodes = [_ExpandNodeName(self.cfg, n) for n in self.op.nodes]
             self.needed_locks[locking.LEVEL_NODE] = list(self.op.nodes)
           else:
             self.needed_locks[locking.LEVEL_NODE] = []
         def DeclareLocks(self, level):
           if level == locking.LEVEL_NODE:
             # if we replace the nodes, we only need to lock the old primary,
             # otherwise we need to lock all nodes for disk re-creation
             primary_only = bool(self.op.nodes)
             self._LockInstancesNodes(primary_only=primary_only)
           elif level == locking.LEVEL_NODE_RES:
             # Copy node locks
             self.needed_locks[locking.LEVEL_NODE_RES] = \
               self.needed_locks[locking.LEVEL_NODE][:]
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on master, primary and secondary nodes of the instance.
           """
           return _BuildInstanceHookEnvByObject(self, self.instance)
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           nl = [self.cfg.GetMasterNode()] + list(self.instance.all_nodes)
           return (nl, nl)
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the instance is in the cluster and is not running.
           """
           instance = self.cfg.GetInstanceInfo(self.op.instance_name)
           assert instance is not None, \
             "Cannot retrieve locked instance %s" % self.op.instance_name
           if self.op.nodes:
             if len(self.op.nodes) != len(instance.all_nodes):
               raise errors.OpPrereqError("Instance %s currently has %d nodes, but"
                                          " %d replacement nodes were specified" %
                                          (instance.name, len(instance.all_nodes),
                                           len(self.op.nodes)),
                                          errors.ECODE_INVAL)
             assert instance.disk_template != constants.DT_DRBD8 or \
                 len(self.op.nodes) == 2
             assert instance.disk_template != constants.DT_PLAIN or \
                 len(self.op.nodes) == 1
             primary_node = self.op.nodes[0]
           else:
             primary_node = instance.primary_node
           _CheckNodeOnline(self, primary_node)
           if instance.disk_template == constants.DT_DISKLESS:
             raise errors.OpPrereqError("Instance '%s' has no disks" %
                                        self.op.instance_name, errors.ECODE_INVAL)
           # if we replace nodes *and* the old primary is offline, we don't
           # check
           assert instance.primary_node in self.owned_locks(locking.LEVEL_NODE)
           assert instance.primary_node in self.owned_locks(locking.LEVEL_NODE_RES)
           old_pnode = self.cfg.GetNodeInfo(instance.primary_node)
           if not (self.op.nodes and old_pnode.offline):
             _CheckInstanceState(self, instance, INSTANCE_NOT_RUNNING,
                                 msg="cannot recreate disks")
           if not self.op.disks:
             self.op.disks = range(len(instance.disks))
           else:
             for idx in self.op.disks:
               if idx >= len(instance.disks):
                 raise errors.OpPrereqError("Invalid disk index '%s'" % idx,
                                            errors.ECODE_INVAL)
           if self.op.disks != range(len(instance.disks)) and self.op.nodes:
             raise errors.OpPrereqError("Can't recreate disks partially and"
                                        " change the nodes at the same time",
                                        errors.ECODE_INVAL)
           self.instance = instance
         def Exec(self, feedback_fn):
           """Recreate the disks.
           """
           instance = self.instance
           assert (self.owned_locks(locking.LEVEL_NODE) ==
                   self.owned_locks(locking.LEVEL_NODE_RES))
           to_skip = []
           mods = [] # keeps track of needed logical_id changes
           for idx, disk in enumerate(instance.disks):
             if idx not in self.op.disks: # disk idx has not been passed in
               to_skip.append(idx)
               continue
             # update secondaries for disks, if needed
             if self.op.nodes:
               if disk.dev_type == constants.LD_DRBD8:
                 # need to update the nodes and minors
                 assert len(self.op.nodes) == 2
                 assert len(disk.logical_id) == 6 # otherwise disk internals
                                                  # have changed
                 (_, _, old_port, _, _, old_secret) = disk.logical_id
                 new_minors = self.cfg.AllocateDRBDMinor(self.op.nodes, instance.name)
                 new_id = (self.op.nodes[0], self.op.nodes[1], old_port,
                           new_minors[0], new_minors[1], old_secret)
                 assert len(disk.logical_id) == len(new_id)
                 mods.append((idx, new_id))
           # now that we have passed all asserts above, we can apply the mods
           # in a single run (to avoid partial changes)
           for idx, new_id in mods:
             instance.disks[idx].logical_id = new_id
           # change primary node, if needed
           if self.op.nodes:
             instance.primary_node = self.op.nodes[0]
             self.LogWarning("Changing the instance's nodes, you will have to"
                             " remove any disks left on the older nodes manually")
           if self.op.nodes:
             self.cfg.Update(instance, feedback_fn)
           _CreateDisks(self, instance, to_skip=to_skip)
       class LUInstanceRename(LogicalUnit):
         """Rename an instance.
         """
         HPATH = "instance-rename"
         HTYPE = constants.HTYPE_INSTANCE
         def CheckArguments(self):
           """Check arguments.
           """
           if self.op.ip_check and not self.op.name_check:
             # TODO: make the ip check more flexible and not depend on the name check
             raise errors.OpPrereqError("IP address check requires a name check",
                                        errors.ECODE_INVAL)
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on master, primary and secondary nodes of the instance.
           """
           env = _BuildInstanceHookEnvByObject(self, self.instance)
           env["INSTANCE_NEW_NAME"] = self.op.new_name
           return env
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           nl = [self.cfg.GetMasterNode()] + list(self.instance.all_nodes)
           return (nl, nl)
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the instance is in the cluster and is not running.
           """
           self.op.instance_name = _ExpandInstanceName(self.cfg,
                                                       self.op.instance_name)
           instance = self.cfg.GetInstanceInfo(self.op.instance_name)
           assert instance is not None
           _CheckNodeOnline(self, instance.primary_node)
           _CheckInstanceState(self, instance, INSTANCE_NOT_RUNNING,
                               msg="cannot rename")
           self.instance = instance
           new_name = self.op.new_name
           if self.op.name_check:
             hostname = netutils.GetHostname(name=new_name)
             if hostname.name != new_name:
               self.LogInfo("Resolved given name '%s' to '%s'", new_name,
                            hostname.name)
             if not utils.MatchNameComponent(self.op.new_name, [hostname.name]):
               raise errors.OpPrereqError(("Resolved hostname '%s' does not look the"
                                           " same as given hostname '%s'") %
                                           (hostname.name, self.op.new_name),
                                           errors.ECODE_INVAL)
             new_name = self.op.new_name = hostname.name
             if (self.op.ip_check and
                 netutils.TcpPing(hostname.ip, constants.DEFAULT_NODED_PORT)):
               raise errors.OpPrereqError("IP %s of instance %s already in use" %
                                          (hostname.ip, new_name),
                                          errors.ECODE_NOTUNIQUE)
           instance_list = self.cfg.GetInstanceList()
           if new_name in instance_list and new_name != instance.name:
             raise errors.OpPrereqError("Instance '%s' is already in the cluster" %
                                        new_name, errors.ECODE_EXISTS)
         def Exec(self, feedback_fn):
           """Rename the instance.
           """
           inst = self.instance
           old_name = inst.name
           rename_file_storage = False
           if (inst.disk_template in constants.DTS_FILEBASED and
               self.op.new_name != inst.name):
             old_file_storage_dir = os.path.dirname(inst.disks[0].logical_id[1])
             rename_file_storage = True
           self.cfg.RenameInstance(inst.name, self.op.new_name)
           # Change the instance lock. This is definitely safe while we hold the BGL.
           # Otherwise the new lock would have to be added in acquired mode.
           assert self.REQ_BGL
           self.glm.remove(locking.LEVEL_INSTANCE, old_name)
           self.glm.add(locking.LEVEL_INSTANCE, self.op.new_name)
           # re-read the instance from the configuration after rename
           inst = self.cfg.GetInstanceInfo(self.op.new_name)
           if rename_file_storage:
             new_file_storage_dir = os.path.dirname(inst.disks[0].logical_id[1])
             result = self.rpc.call_file_storage_dir_rename(inst.primary_node,
                                                            old_file_storage_dir,
                                                            new_file_storage_dir)
             result.Raise("Could not rename on node %s directory '%s' to '%s'"
                          " (but the instance has been renamed in Ganeti)" %
                          (inst.primary_node, old_file_storage_dir,
                           new_file_storage_dir))
           _StartInstanceDisks(self, inst, None)
           try:
             result = self.rpc.call_instance_run_rename(inst.primary_node, inst,
                                                        old_name, self.op.debug_level)
             msg = result.fail_msg
             if msg:
               msg = ("Could not run OS rename script for instance %s on node %s"
                      " (but the instance has been renamed in Ganeti): %s" %
                      (inst.name, inst.primary_node, msg))
               self.proc.LogWarning(msg)
           finally:
             _ShutdownInstanceDisks(self, inst)
           return inst.name
       class LUInstanceRemove(LogicalUnit):
         """Remove an instance.
         """
         HPATH = "instance-remove"
         HTYPE = constants.HTYPE_INSTANCE
         REQ_BGL = False
         def ExpandNames(self):
           self._ExpandAndLockInstance()
           self.needed_locks[locking.LEVEL_NODE] = []
           self.needed_locks[locking.LEVEL_NODE_RES] = []
           self.recalculate_locks[locking.LEVEL_NODE] = constants.LOCKS_REPLACE
         def DeclareLocks(self, level):
           if level == locking.LEVEL_NODE:
             self._LockInstancesNodes()
           elif level == locking.LEVEL_NODE_RES:
             # Copy node locks
             self.needed_locks[locking.LEVEL_NODE_RES] = \
               self.needed_locks[locking.LEVEL_NODE][:]
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on master, primary and secondary nodes of the instance.
           """
           env = _BuildInstanceHookEnvByObject(self, self.instance)
           env["SHUTDOWN_TIMEOUT"] = self.op.shutdown_timeout
           return env
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           nl = [self.cfg.GetMasterNode()]
           nl_post = list(self.instance.all_nodes) + nl
           return (nl, nl_post)
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the instance is in the cluster.
           """
           self.instance = self.cfg.GetInstanceInfo(self.op.instance_name)
           assert self.instance is not None, \
             "Cannot retrieve locked instance %s" % self.op.instance_name
         def Exec(self, feedback_fn):
           """Remove the instance.
           """
           instance = self.instance
           logging.info("Shutting down instance %s on node %s",
                        instance.name, instance.primary_node)
           result = self.rpc.call_instance_shutdown(instance.primary_node, instance,
                                                    self.op.shutdown_timeout)
           msg = result.fail_msg
           if msg:
             if self.op.ignore_failures:
               feedback_fn("Warning: can't shutdown instance: %s" % msg)
             else:
               raise errors.OpExecError("Could not shutdown instance %s on"
                                        " node %s: %s" %
                                        (instance.name, instance.primary_node, msg))
           assert (self.owned_locks(locking.LEVEL_NODE) ==
                   self.owned_locks(locking.LEVEL_NODE_RES))
           assert not (set(instance.all_nodes) -
                       self.owned_locks(locking.LEVEL_NODE)), \
             "Not owning correct locks"
           _RemoveInstance(self, feedback_fn, instance, self.op.ignore_failures)
       def _RemoveInstance(lu, feedback_fn, instance, ignore_failures):
         """Utility function to remove an instance.
         """
         logging.info("Removing block devices for instance %s", instance.name)
         if not _RemoveDisks(lu, instance):
           if not ignore_failures:
             raise errors.OpExecError("Can't remove instance's disks")
           feedback_fn("Warning: can't remove instance's disks")
         logging.info("Removing instance %s out of cluster config", instance.name)
         lu.cfg.RemoveInstance(instance.name)
         assert not lu.remove_locks.get(locking.LEVEL_INSTANCE), \
           "Instance lock removal conflict"
         # Remove lock for the instance
         lu.remove_locks[locking.LEVEL_INSTANCE] = instance.name
       class LUInstanceQuery(NoHooksLU):
         """Logical unit for querying instances.
         """
         # pylint: disable=W0142
         REQ_BGL = False
         def CheckArguments(self):
           self.iq = _InstanceQuery(qlang.MakeSimpleFilter("name", self.op.names),
                                    self.op.output_fields, self.op.use_locking)
         def ExpandNames(self):
           self.iq.ExpandNames(self)
         def DeclareLocks(self, level):
           self.iq.DeclareLocks(self, level)
         def Exec(self, feedback_fn):
           return self.iq.OldStyleQuery(self)
       class LUInstanceFailover(LogicalUnit):
         """Failover an instance.
         """
         HPATH = "instance-failover"
         HTYPE = constants.HTYPE_INSTANCE
         REQ_BGL = False
         def CheckArguments(self):
           """Check the arguments.
           """
           self.iallocator = getattr(self.op, "iallocator", None)
           self.target_node = getattr(self.op, "target_node", None)
         def ExpandNames(self):
           self._ExpandAndLockInstance()
           if self.op.target_node is not None:
             self.op.target_node = _ExpandNodeName(self.cfg, self.op.target_node)
           self.needed_locks[locking.LEVEL_NODE] = []
           self.recalculate_locks[locking.LEVEL_NODE] = constants.LOCKS_REPLACE
           ignore_consistency = self.op.ignore_consistency
           shutdown_timeout = self.op.shutdown_timeout
           self._migrater = TLMigrateInstance(self, self.op.instance_name,
                                              cleanup=False,
                                              failover=True,
                                              ignore_consistency=ignore_consistency,
                                              shutdown_timeout=shutdown_timeout)
           self.tasklets = [self._migrater]
         def DeclareLocks(self, level):
           if level == locking.LEVEL_NODE:
             instance = self.context.cfg.GetInstanceInfo(self.op.instance_name)
             if instance.disk_template in constants.DTS_EXT_MIRROR:
               if self.op.target_node is None:
                 self.needed_locks[locking.LEVEL_NODE] = locking.ALL_SET
               else:
                 self.needed_locks[locking.LEVEL_NODE] = [instance.primary_node,
                                                          self.op.target_node]
               del self.recalculate_locks[locking.LEVEL_NODE]
             else:
               self._LockInstancesNodes()
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on master, primary and secondary nodes of the instance.
           """
           instance = self._migrater.instance
           source_node = instance.primary_node
           target_node = self.op.target_node
           env = {
             "IGNORE_CONSISTENCY": self.op.ignore_consistency,
             "SHUTDOWN_TIMEOUT": self.op.shutdown_timeout,
             "OLD_PRIMARY": source_node,
             "NEW_PRIMARY": target_node,
+            }
           if instance.disk_template in constants.DTS_INT_MIRROR:
             env["OLD_SECONDARY"] = instance.secondary_nodes[0]
             env["NEW_SECONDARY"] = source_node
           else:
             env["OLD_SECONDARY"] = env["NEW_SECONDARY"] = ""
           env.update(_BuildInstanceHookEnvByObject(self, instance))
           return env
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           instance = self._migrater.instance
           nl = [self.cfg.GetMasterNode()] + list(instance.secondary_nodes)
           return (nl, nl + [instance.primary_node])
       class LUInstanceMigrate(LogicalUnit):
         """Migrate an instance.
         This is migration without shutting down, compared to the failover,
         which is done with shutdown.
         """
         HPATH = "instance-migrate"
         HTYPE = constants.HTYPE_INSTANCE
         REQ_BGL = False
         def ExpandNames(self):
           self._ExpandAndLockInstance()
           if self.op.target_node is not None:
             self.op.target_node = _ExpandNodeName(self.cfg, self.op.target_node)
           self.needed_locks[locking.LEVEL_NODE] = []
           self.recalculate_locks[locking.LEVEL_NODE] = constants.LOCKS_REPLACE
           self._migrater = TLMigrateInstance(self, self.op.instance_name,
                                              cleanup=self.op.cleanup,
                                              failover=False,
                                              fallback=self.op.allow_failover)
           self.tasklets = [self._migrater]
         def DeclareLocks(self, level):
           if level == locking.LEVEL_NODE:
             instance = self.context.cfg.GetInstanceInfo(self.op.instance_name)
             if instance.disk_template in constants.DTS_EXT_MIRROR:
               if self.op.target_node is None:
                 self.needed_locks[locking.LEVEL_NODE] = locking.ALL_SET
               else:
                 self.needed_locks[locking.LEVEL_NODE] = [instance.primary_node,
                                                          self.op.target_node]
               del self.recalculate_locks[locking.LEVEL_NODE]
             else:
               self._LockInstancesNodes()
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on master, primary and secondary nodes of the instance.
           """
           instance = self._migrater.instance
           source_node = instance.primary_node
           target_node = self.op.target_node
           env = _BuildInstanceHookEnvByObject(self, instance)
           env.update({
             "MIGRATE_LIVE": self._migrater.live,
             "MIGRATE_CLEANUP": self.op.cleanup,
             "OLD_PRIMARY": source_node,
             "NEW_PRIMARY": target_node,
             })
           if instance.disk_template in constants.DTS_INT_MIRROR:
             env["OLD_SECONDARY"] = target_node
             env["NEW_SECONDARY"] = source_node
           else:
             env["OLD_SECONDARY"] = env["NEW_SECONDARY"] = None
           return env
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           instance = self._migrater.instance
           nl = [self.cfg.GetMasterNode()] + list(instance.secondary_nodes)
           return (nl, nl + [instance.primary_node])
       class LUInstanceMove(LogicalUnit):
         """Move an instance by data-copying.
         """
         HPATH = "instance-move"
         HTYPE = constants.HTYPE_INSTANCE
         REQ_BGL = False
         def ExpandNames(self):
           self._ExpandAndLockInstance()
           target_node = _ExpandNodeName(self.cfg, self.op.target_node)
           self.op.target_node = target_node
           self.needed_locks[locking.LEVEL_NODE] = [target_node]
           self.needed_locks[locking.LEVEL_NODE_RES] = []
           self.recalculate_locks[locking.LEVEL_NODE] = constants.LOCKS_APPEND
         def DeclareLocks(self, level):
           if level == locking.LEVEL_NODE:
             self._LockInstancesNodes(primary_only=True)
           elif level == locking.LEVEL_NODE_RES:
             # Copy node locks
             self.needed_locks[locking.LEVEL_NODE_RES] = \
               self.needed_locks[locking.LEVEL_NODE][:]
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on master, primary and secondary nodes of the instance.
           """
           env = {
             "TARGET_NODE": self.op.target_node,
             "SHUTDOWN_TIMEOUT": self.op.shutdown_timeout,
+            }
           env.update(_BuildInstanceHookEnvByObject(self, self.instance))
           return env
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           nl = [
             self.cfg.GetMasterNode(),
             self.instance.primary_node,
             self.op.target_node,
+            ]
           return (nl, nl)
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the instance is in the cluster.
           """
           self.instance = instance = self.cfg.GetInstanceInfo(self.op.instance_name)
           assert self.instance is not None, \
             "Cannot retrieve locked instance %s" % self.op.instance_name
           node = self.cfg.GetNodeInfo(self.op.target_node)
           assert node is not None, \
             "Cannot retrieve locked node %s" % self.op.target_node
           self.target_node = target_node = node.name
           if target_node == instance.primary_node:
             raise errors.OpPrereqError("Instance %s is already on the node %s" %
                                        (instance.name, target_node),
                                        errors.ECODE_STATE)
           bep = self.cfg.GetClusterInfo().FillBE(instance)
           for idx, dsk in enumerate(instance.disks):
             if dsk.dev_type not in (constants.LD_LV, constants.LD_FILE):
               raise errors.OpPrereqError("Instance disk %d has a complex layout,"
                                          " cannot copy" % idx, errors.ECODE_STATE)
           _CheckNodeOnline(self, target_node)
           _CheckNodeNotDrained(self, target_node)
           _CheckNodeVmCapable(self, target_node)
           if instance.admin_state == constants.ADMINST_UP:
             # check memory requirements on the secondary node
             _CheckNodeFreeMemory(self, target_node, "failing over instance %s" %
                                  instance.name, bep[constants.BE_MAXMEM],
                                  instance.hypervisor)
           else:
             self.LogInfo("Not checking memory on the secondary node as"
                          " instance will not be started")
           # check bridge existance
           _CheckInstanceBridgesExist(self, instance, node=target_node)
         def Exec(self, feedback_fn):
           """Move an instance.
           The move is done by shutting it down on its present node, copying
           the data over (slow) and starting it on the new node.
           """
           instance = self.instance
           source_node = instance.primary_node
           target_node = self.target_node
           self.LogInfo("Shutting down instance %s on source node %s",
                        instance.name, source_node)
           assert (self.owned_locks(locking.LEVEL_NODE) ==
                   self.owned_locks(locking.LEVEL_NODE_RES))
           result = self.rpc.call_instance_shutdown(source_node, instance,
                                                    self.op.shutdown_timeout)
           msg = result.fail_msg
           if msg:
             if self.op.ignore_consistency:
               self.proc.LogWarning("Could not shutdown instance %s on node %s."
                                    " Proceeding anyway. Please make sure node"
                                    " %s is down. Error details: %s",
                                    instance.name, source_node, source_node, msg)
             else:
               raise errors.OpExecError("Could not shutdown instance %s on"
                                        " node %s: %s" %
                                        (instance.name, source_node, msg))
           # create the target disks
           try:
             _CreateDisks(self, instance, target_node=target_node)
           except errors.OpExecError:
             self.LogWarning("Device creation failed, reverting...")
             try:
               _RemoveDisks(self, instance, target_node=target_node)
             finally:
               self.cfg.ReleaseDRBDMinors(instance.name)
               raise
           cluster_name = self.cfg.GetClusterInfo().cluster_name
           errs = []
           # activate, get path, copy the data over
           for idx, disk in enumerate(instance.disks):
             self.LogInfo("Copying data for disk %d", idx)
             result = self.rpc.call_blockdev_assemble(target_node, disk,
                                                      instance.name, True, idx)
             if result.fail_msg:
               self.LogWarning("Can't assemble newly created disk %d: %s",
                               idx, result.fail_msg)
               errs.append(result.fail_msg)
               break
             dev_path = result.payload
             result = self.rpc.call_blockdev_export(source_node, disk,
                                                    target_node, dev_path,
                                                    cluster_name)
             if result.fail_msg:
               self.LogWarning("Can't copy data over for disk %d: %s",
                               idx, result.fail_msg)
               errs.append(result.fail_msg)
               break
           if errs:
             self.LogWarning("Some disks failed to copy, aborting")
             try:
               _RemoveDisks(self, instance, target_node=target_node)
             finally:
               self.cfg.ReleaseDRBDMinors(instance.name)
               raise errors.OpExecError("Errors during disk copy: %s" %
                                        (",".join(errs),))
           instance.primary_node = target_node
           self.cfg.Update(instance, feedback_fn)
           self.LogInfo("Removing the disks on the original node")
           _RemoveDisks(self, instance, target_node=source_node)
           # Only start the instance if it's marked as up
           if instance.admin_state == constants.ADMINST_UP:
             self.LogInfo("Starting instance %s on node %s",
                          instance.name, target_node)
             disks_ok, _ = _AssembleInstanceDisks(self, instance,
                                                  ignore_secondaries=True)
             if not disks_ok:
               _ShutdownInstanceDisks(self, instance)
               raise errors.OpExecError("Can't activate the instance's disks")
             result = self.rpc.call_instance_start(target_node,
                                                   (instance, None, None), False)
             msg = result.fail_msg
             if msg:
               _ShutdownInstanceDisks(self, instance)
               raise errors.OpExecError("Could not start instance %s on node %s: %s" %
                                        (instance.name, target_node, msg))
       class LUNodeMigrate(LogicalUnit):
         """Migrate all instances from a node.
         """
         HPATH = "node-migrate"
         HTYPE = constants.HTYPE_NODE
         REQ_BGL = False
         def CheckArguments(self):
           pass
         def ExpandNames(self):
           self.op.node_name = _ExpandNodeName(self.cfg, self.op.node_name)
           self.share_locks = _ShareAll()
           self.needed_locks = {
             locking.LEVEL_NODE: [self.op.node_name],
+            }
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on the master, the primary and all the secondaries.
           """
           return {
             "NODE_NAME": self.op.node_name,
+            }
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           nl = [self.cfg.GetMasterNode()]
           return (nl, nl)
         def CheckPrereq(self):
           pass
         def Exec(self, feedback_fn):
           # Prepare jobs for migration instances
           jobs = [
             [opcodes.OpInstanceMigrate(instance_name=inst.name,
                                        mode=self.op.mode,
                                        live=self.op.live,
                                        iallocator=self.op.iallocator,
                                        target_node=self.op.target_node)]
             for inst in _GetNodePrimaryInstances(self.cfg, self.op.node_name)
+            ]
           # TODO: Run iallocator in this opcode and pass correct placement options to
           # OpInstanceMigrate. Since other jobs can modify the cluster between
           # running the iallocator and the actual migration, a good consistency model
           # will have to be found.
           assert (frozenset(self.owned_locks(locking.LEVEL_NODE)) ==
                   frozenset([self.op.node_name]))
           return ResultWithJobs(jobs)
       class TLMigrateInstance(Tasklet):
         """Tasklet class for instance migration.
         @type live: boolean
         @ivar live: whether the migration will be done live or non-live;
             this variable is initalized only after CheckPrereq has run
         @type cleanup: boolean
         @ivar cleanup: Wheater we cleanup from a failed migration
         @type iallocator: string
         @ivar iallocator: The iallocator used to determine target_node
         @type target_node: string
         @ivar target_node: If given, the target_node to reallocate the instance to
         @type failover: boolean
         @ivar failover: Whether operation results in failover or migration
         @type fallback: boolean
         @ivar fallback: Whether fallback to failover is allowed if migration not
                         possible
         @type ignore_consistency: boolean
         @ivar ignore_consistency: Wheter we should ignore consistency between source
                                   and target node
         @type shutdown_timeout: int
         @ivar shutdown_timeout: In case of failover timeout of the shutdown
         """
         # Constants
         _MIGRATION_POLL_INTERVAL = 1      # seconds
         _MIGRATION_FEEDBACK_INTERVAL = 10 # seconds
         def __init__(self, lu, instance_name, cleanup=False,
                      failover=False, fallback=False,
                      ignore_consistency=False,
                      shutdown_timeout=constants.DEFAULT_SHUTDOWN_TIMEOUT):
           """Initializes this class.
           """
           Tasklet.__init__(self, lu)
           # Parameters
           self.instance_name = instance_name
           self.cleanup = cleanup
           self.live = False # will be overridden later
           self.failover = failover
           self.fallback = fallback
           self.ignore_consistency = ignore_consistency
           self.shutdown_timeout = shutdown_timeout
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the instance is in the cluster.
           """
           instance_name = _ExpandInstanceName(self.lu.cfg, self.instance_name)
           instance = self.cfg.GetInstanceInfo(instance_name)
           assert instance is not None
           self.instance = instance
           if (not self.cleanup and
               not instance.admin_state == constants.ADMINST_UP and
               not self.failover and self.fallback):
             self.lu.LogInfo("Instance is marked down or offline, fallback allowed,"
                             " switching to failover")
             self.failover = True
           if instance.disk_template not in constants.DTS_MIRRORED:
             if self.failover:
               text = "failovers"
             else:
               text = "migrations"
             raise errors.OpPrereqError("Instance's disk layout '%s' does not allow"
                                        " %s" % (instance.disk_template, text),
                                        errors.ECODE_STATE)
           if instance.disk_template in constants.DTS_EXT_MIRROR:
             _CheckIAllocatorOrNode(self.lu, "iallocator", "target_node")
             if self.lu.op.iallocator:
               self._RunAllocator()
             else:
               # We set set self.target_node as it is required by
               # BuildHooksEnv
               self.target_node = self.lu.op.target_node
             # self.target_node is already populated, either directly or by the
             # iallocator run
             target_node = self.target_node
             if self.target_node == instance.primary_node:
               raise errors.OpPrereqError("Cannot migrate instance %s"
                                          " to its primary (%s)" %
                                          (instance.name, instance.primary_node))
             if len(self.lu.tasklets) == 1:
               # It is safe to release locks only when we're the only tasklet
               # in the LU
               _ReleaseLocks(self.lu, locking.LEVEL_NODE,
                             keep=[instance.primary_node, self.target_node])
           else:
             secondary_nodes = instance.secondary_nodes
             if not secondary_nodes:
               raise errors.ConfigurationError("No secondary node but using"
                                               " %s disk template" %
                                               instance.disk_template)
             target_node = secondary_nodes[0]
             if self.lu.op.iallocator or (self.lu.op.target_node and
                                          self.lu.op.target_node != target_node):
               if self.failover:
                 text = "failed over"
               else:
                 text = "migrated"
               raise errors.OpPrereqError("Instances with disk template %s cannot"
                                          " be %s to arbitrary nodes"
                                          " (neither an iallocator nor a target"
                                          " node can be passed)" %
                                          (instance.disk_template, text),
                                          errors.ECODE_INVAL)
           i_be = self.cfg.GetClusterInfo().FillBE(instance)
           # check memory requirements on the secondary node
           if not self.failover or instance.admin_state == constants.ADMINST_UP:
             _CheckNodeFreeMemory(self.lu, target_node, "migrating instance %s" %
                                  instance.name, i_be[constants.BE_MAXMEM],
                                  instance.hypervisor)
           else:
             self.lu.LogInfo("Not checking memory on the secondary node as"
                             " instance will not be started")
           # check bridge existance
           _CheckInstanceBridgesExist(self.lu, instance, node=target_node)
           if not self.cleanup:
             _CheckNodeNotDrained(self.lu, target_node)
             if not self.failover:
               result = self.rpc.call_instance_migratable(instance.primary_node,
                                                          instance)
               if result.fail_msg and self.fallback:
                 self.lu.LogInfo("Can't migrate, instance offline, fallback to"
                                 " failover")
                 self.failover = True
               else:
                 result.Raise("Can't migrate, please use failover",
                              prereq=True, ecode=errors.ECODE_STATE)
           assert not (self.failover and self.cleanup)
           if not self.failover:
             if self.lu.op.live is not None and self.lu.op.mode is not None:
               raise errors.OpPrereqError("Only one of the 'live' and 'mode'"
                                          " parameters are accepted",
                                          errors.ECODE_INVAL)
             if self.lu.op.live is not None:
               if self.lu.op.live:
                 self.lu.op.mode = constants.HT_MIGRATION_LIVE
               else:
                 self.lu.op.mode = constants.HT_MIGRATION_NONLIVE
               # reset the 'live' parameter to None so that repeated
               # invocations of CheckPrereq do not raise an exception
               self.lu.op.live = None
             elif self.lu.op.mode is None:
               # read the default value from the hypervisor
               i_hv = self.cfg.GetClusterInfo().FillHV(self.instance,
                                                       skip_globals=False)
               self.lu.op.mode = i_hv[constants.HV_MIGRATION_MODE]
             self.live = self.lu.op.mode == constants.HT_MIGRATION_LIVE
           else:
             # Failover is never live
             self.live = False
         def _RunAllocator(self):
           """Run the allocator based on input opcode.
           """
           ial = IAllocator(self.cfg, self.rpc,
                            mode=constants.IALLOCATOR_MODE_RELOC,
                            name=self.instance_name,
                            # TODO See why hail breaks with a single node below
                            relocate_from=[self.instance.primary_node,
                                           self.instance.primary_node],
+                           )
           ial.Run(self.lu.op.iallocator)
           if not ial.success:
             raise errors.OpPrereqError("Can't compute nodes using"
                                        " iallocator '%s': %s" %
                                        (self.lu.op.iallocator, ial.info),
                                        errors.ECODE_NORES)
           if len(ial.result) != ial.required_nodes:
             raise errors.OpPrereqError("iallocator '%s' returned invalid number"
                                        " of nodes (%s), required %s" %
                                        (self.lu.op.iallocator, len(ial.result),
                                         ial.required_nodes), errors.ECODE_FAULT)
           self.target_node = ial.result[0]
           self.lu.LogInfo("Selected nodes for instance %s via iallocator %s: %s",
                        self.instance_name, self.lu.op.iallocator,
                        utils.CommaJoin(ial.result))
         def _WaitUntilSync(self):
           """Poll with custom rpc for disk sync.
           This uses our own step-based rpc call.
           """
           self.feedback_fn("* wait until resync is done")
           all_done = False
           while not all_done:
             all_done = True
             result = self.rpc.call_drbd_wait_sync(self.all_nodes,
                                                   self.nodes_ip,
                                                   self.instance.disks)
             min_percent = 100
             for node, nres in result.items():
               nres.Raise("Cannot resync disks on node %s" % node)
               node_done, node_percent = nres.payload
               all_done = all_done and node_done
               if node_percent is not None:
                 min_percent = min(min_percent, node_percent)
             if not all_done:
               if min_percent < 100:
                 self.feedback_fn("   - progress: %.1f%%" % min_percent)
               time.sleep(2)
         def _EnsureSecondary(self, node):
           """Demote a node to secondary.
           """
           self.feedback_fn("* switching node %s to secondary mode" % node)
           for dev in self.instance.disks:
             self.cfg.SetDiskID(dev, node)
           result = self.rpc.call_blockdev_close(node, self.instance.name,
                                                 self.instance.disks)
           result.Raise("Cannot change disk to secondary on node %s" % node)
         def _GoStandalone(self):
           """Disconnect from the network.
           """
           self.feedback_fn("* changing into standalone mode")
           result = self.rpc.call_drbd_disconnect_net(self.all_nodes, self.nodes_ip,
                                                      self.instance.disks)
           for node, nres in result.items():
             nres.Raise("Cannot disconnect disks node %s" % node)
         def _GoReconnect(self, multimaster):
           """Reconnect to the network.
           """
           if multimaster:
             msg = "dual-master"
           else:
             msg = "single-master"
           self.feedback_fn("* changing disks into %s mode" % msg)
           result = self.rpc.call_drbd_attach_net(self.all_nodes, self.nodes_ip,
                                                  self.instance.disks,
                                                  self.instance.name, multimaster)
           for node, nres in result.items():
             nres.Raise("Cannot change disks config on node %s" % node)
         def _ExecCleanup(self):
           """Try to cleanup after a failed migration.
           The cleanup is done by:
             - check that the instance is running only on one node
               (and update the config if needed)
             - change disks on its secondary node to secondary
             - wait until disks are fully synchronized
             - disconnect from the network
             - change disks into single-master mode
             - wait again until disks are fully synchronized
           """
           instance = self.instance
           target_node = self.target_node
           source_node = self.source_node
           # check running on only one node
           self.feedback_fn("* checking where the instance actually runs"
                            " (if this hangs, the hypervisor might be in"
                            " a bad state)")
           ins_l = self.rpc.call_instance_list(self.all_nodes, [instance.hypervisor])
           for node, result in ins_l.items():
             result.Raise("Can't contact node %s" % node)
           runningon_source = instance.name in ins_l[source_node].payload
           runningon_target = instance.name in ins_l[target_node].payload
           if runningon_source and runningon_target:
             raise errors.OpExecError("Instance seems to be running on two nodes,"
                                      " or the hypervisor is confused; you will have"
                                      " to ensure manually that it runs only on one"
                                      " and restart this operation")
           if not (runningon_source or runningon_target):
             raise errors.OpExecError("Instance does not seem to be running at all;"
                                      " in this case it's safer to repair by"
                                      " running 'gnt-instance stop' to ensure disk"
                                      " shutdown, and then restarting it")
           if runningon_target:
             # the migration has actually succeeded, we need to update the config
             self.feedback_fn("* instance running on secondary node (%s),"
                              " updating config" % target_node)
             instance.primary_node = target_node
             self.cfg.Update(instance, self.feedback_fn)
             demoted_node = source_node
           else:
             self.feedback_fn("* instance confirmed to be running on its"
                              " primary node (%s)" % source_node)
             demoted_node = target_node
           if instance.disk_template in constants.DTS_INT_MIRROR:
             self._EnsureSecondary(demoted_node)
             try:
               self._WaitUntilSync()
             except errors.OpExecError:
               # we ignore here errors, since if the device is standalone, it
               # won't be able to sync
               pass
             self._GoStandalone()
             self._GoReconnect(False)
             self._WaitUntilSync()
           self.feedback_fn("* done")
         def _RevertDiskStatus(self):
           """Try to revert the disk status after a failed migration.
           """
           target_node = self.target_node
           if self.instance.disk_template in constants.DTS_EXT_MIRROR:
             return
           try:
             self._EnsureSecondary(target_node)
             self._GoStandalone()
             self._GoReconnect(False)
             self._WaitUntilSync()
           except errors.OpExecError, err:
             self.lu.LogWarning("Migration failed and I can't reconnect the drives,"
                                " please try to recover the instance manually;"
                                " error '%s'" % str(err))
         def _AbortMigration(self):
           """Call the hypervisor code to abort a started migration.
           """
           instance = self.instance
           target_node = self.target_node
           source_node = self.source_node
           migration_info = self.migration_info
           abort_result = self.rpc.call_instance_finalize_migration_dst(target_node,
                                                                        instance,
                                                                        migration_info,
                                                                        False)
           abort_msg = abort_result.fail_msg
           if abort_msg:
             logging.error("Aborting migration failed on target node %s: %s",
                           target_node, abort_msg)
             # Don't raise an exception here, as we stil have to try to revert the
             # disk status, even if this step failed.
           abort_result = self.rpc.call_instance_finalize_migration_src(source_node,
               instance, False, self.live)
           abort_msg = abort_result.fail_msg
           if abort_msg:
             logging.error("Aborting migration failed on source node %s: %s",
                           source_node, abort_msg)
         def _ExecMigration(self):
           """Migrate an instance.
           The migrate is done by:
             - change the disks into dual-master mode
             - wait until disks are fully synchronized again
             - migrate the instance
             - change disks on the new secondary node (the old primary) to secondary
             - wait until disks are fully synchronized
             - change disks into single-master mode
           """
           instance = self.instance
           target_node = self.target_node
           source_node = self.source_node
           # Check for hypervisor version mismatch and warn the user.
           nodeinfo = self.rpc.call_node_info([source_node, target_node],
                                              None, [self.instance.hypervisor])
           for ninfo in nodeinfo.values():
             ninfo.Raise("Unable to retrieve node information from node '%s'" %
                         ninfo.node)
           (_, _, (src_info, )) = nodeinfo[source_node].payload
           (_, _, (dst_info, )) = nodeinfo[target_node].payload
           if ((constants.HV_NODEINFO_KEY_VERSION in src_info) and
               (constants.HV_NODEINFO_KEY_VERSION in dst_info)):
             src_version = src_info[constants.HV_NODEINFO_KEY_VERSION]
             dst_version = dst_info[constants.HV_NODEINFO_KEY_VERSION]
             if src_version != dst_version:
               self.feedback_fn("* warning: hypervisor version mismatch between"
                                " source (%s) and target (%s) node" %
                                (src_version, dst_version))
           self.feedback_fn("* checking disk consistency between source and target")
           for dev in instance.disks:
             if not _CheckDiskConsistency(self.lu, dev, target_node, False):
               raise errors.OpExecError("Disk %s is degraded or not fully"
                                        " synchronized on target node,"
                                        " aborting migration" % dev.iv_name)
           # First get the migration information from the remote node
           result = self.rpc.call_migration_info(source_node, instance)
           msg = result.fail_msg
           if msg:
             log_err = ("Failed fetching source migration information from %s: %s" %
                        (source_node, msg))
             logging.error(log_err)
             raise errors.OpExecError(log_err)
           self.migration_info = migration_info = result.payload
           if self.instance.disk_template not in constants.DTS_EXT_MIRROR:
             # Then switch the disks to master/master mode
             self._EnsureSecondary(target_node)
             self._GoStandalone()
             self._GoReconnect(True)
             self._WaitUntilSync()
           self.feedback_fn("* preparing %s to accept the instance" % target_node)
           result = self.rpc.call_accept_instance(target_node,
                                                  instance,
                                                  migration_info,
                                                  self.nodes_ip[target_node])
           msg = result.fail_msg
           if msg:
             logging.error("Instance pre-migration failed, trying to revert"
                           " disk status: %s", msg)
             self.feedback_fn("Pre-migration failed, aborting")
             self._AbortMigration()
             self._RevertDiskStatus()
             raise errors.OpExecError("Could not pre-migrate instance %s: %s" %
                                      (instance.name, msg))
           self.feedback_fn("* migrating instance to %s" % target_node)
           result = self.rpc.call_instance_migrate(source_node, instance,
                                                   self.nodes_ip[target_node],
                                                   self.live)
           msg = result.fail_msg
           if msg:
             logging.error("Instance migration failed, trying to revert"
                           " disk status: %s", msg)
             self.feedback_fn("Migration failed, aborting")
             self._AbortMigration()
             self._RevertDiskStatus()
             raise errors.OpExecError("Could not migrate instance %s: %s" %
                                      (instance.name, msg))
           self.feedback_fn("* starting memory transfer")
           last_feedback = time.time()
           while True:
             result = self.rpc.call_instance_get_migration_status(source_node,
                                                                  instance)
             msg = result.fail_msg
             ms = result.payload   # MigrationStatus instance
             if msg or (ms.status in constants.HV_MIGRATION_FAILED_STATUSES):
               logging.error("Instance migration failed, trying to revert"
                             " disk status: %s", msg)
               self.feedback_fn("Migration failed, aborting")
               self._AbortMigration()
               self._RevertDiskStatus()
               raise errors.OpExecError("Could not migrate instance %s: %s" %
                                        (instance.name, msg))
             if result.payload.status != constants.HV_MIGRATION_ACTIVE:
               self.feedback_fn("* memory transfer complete")
               break
             if (utils.TimeoutExpired(last_feedback,
                                      self._MIGRATION_FEEDBACK_INTERVAL) and
                 ms.transferred_ram is not None):
               mem_progress = 100 * float(ms.transferred_ram) / float(ms.total_ram)
               self.feedback_fn("* memory transfer progress: %.2f %%" % mem_progress)
               last_feedback = time.time()
             time.sleep(self._MIGRATION_POLL_INTERVAL)
           result = self.rpc.call_instance_finalize_migration_src(source_node,
                                                                  instance,
                                                                  True,
                                                                  self.live)
           msg = result.fail_msg
           if msg:
             logging.error("Instance migration succeeded, but finalization failed"
                           " on the source node: %s", msg)
             raise errors.OpExecError("Could not finalize instance migration: %s" %
                                      msg)
           instance.primary_node = target_node
           # distribute new instance config to the other nodes
           self.cfg.Update(instance, self.feedback_fn)
           result = self.rpc.call_instance_finalize_migration_dst(target_node,
                                                                  instance,
                                                                  migration_info,
                                                                  True)
           msg = result.fail_msg
           if msg:
             logging.error("Instance migration succeeded, but finalization failed"
                           " on the target node: %s", msg)
             raise errors.OpExecError("Could not finalize instance migration: %s" %
                                      msg)
           if self.instance.disk_template not in constants.DTS_EXT_MIRROR:
             self._EnsureSecondary(source_node)
             self._WaitUntilSync()
             self._GoStandalone()
             self._GoReconnect(False)
             self._WaitUntilSync()
           self.feedback_fn("* done")
         def _ExecFailover(self):
           """Failover an instance.
           The failover is done by shutting it down on its present node and
           starting it on the secondary.
           """
           instance = self.instance
           primary_node = self.cfg.GetNodeInfo(instance.primary_node)
           source_node = instance.primary_node
           target_node = self.target_node
           if instance.admin_state == constants.ADMINST_UP:
             self.feedback_fn("* checking disk consistency between source and target")
             for dev in instance.disks:
               # for drbd, these are drbd over lvm
               if not _CheckDiskConsistency(self.lu, dev, target_node, False):
                 if primary_node.offline:
                   self.feedback_fn("Node %s is offline, ignoring degraded disk %s on"
                                    " target node %s" %
                                    (primary_node.name, dev.iv_name, target_node))
                 elif not self.ignore_consistency:
                   raise errors.OpExecError("Disk %s is degraded on target node,"
                                            " aborting failover" % dev.iv_name)
           else:
             self.feedback_fn("* not checking disk consistency as instance is not"
                              " running")
           self.feedback_fn("* shutting down instance on source node")
           logging.info("Shutting down instance %s on node %s",
                        instance.name, source_node)
           result = self.rpc.call_instance_shutdown(source_node, instance,
                                                    self.shutdown_timeout)
           msg = result.fail_msg
           if msg:
             if self.ignore_consistency or primary_node.offline:
               self.lu.LogWarning("Could not shutdown instance %s on node %s,"
                                  " proceeding anyway; please make sure node"
                                  " %s is down; error details: %s",
                                  instance.name, source_node, source_node, msg)
             else:
               raise errors.OpExecError("Could not shutdown instance %s on"
                                        " node %s: %s" %
                                        (instance.name, source_node, msg))
           self.feedback_fn("* deactivating the instance's disks on source node")
           if not _ShutdownInstanceDisks(self.lu, instance, ignore_primary=True):
             raise errors.OpExecError("Can't shut down the instance's disks")
           instance.primary_node = target_node
           # distribute new instance config to the other nodes
           self.cfg.Update(instance, self.feedback_fn)
           # Only start the instance if it's marked as up
           if instance.admin_state == constants.ADMINST_UP:
             self.feedback_fn("* activating the instance's disks on target node %s" %
                              target_node)
             logging.info("Starting instance %s on node %s",
                          instance.name, target_node)
             disks_ok, _ = _AssembleInstanceDisks(self.lu, instance,
                                                  ignore_secondaries=True)
             if not disks_ok:
               _ShutdownInstanceDisks(self.lu, instance)
               raise errors.OpExecError("Can't activate the instance's disks")
             self.feedback_fn("* starting the instance on the target node %s" %
                              target_node)
             result = self.rpc.call_instance_start(target_node, (instance, None, None),
                                                   False)
             msg = result.fail_msg
             if msg:
               _ShutdownInstanceDisks(self.lu, instance)
               raise errors.OpExecError("Could not start instance %s on node %s: %s" %
                                        (instance.name, target_node, msg))
         def Exec(self, feedback_fn):
           """Perform the migration.
           """
           self.feedback_fn = feedback_fn
           self.source_node = self.instance.primary_node
           # FIXME: if we implement migrate-to-any in DRBD, this needs fixing
           if self.instance.disk_template in constants.DTS_INT_MIRROR:
             self.target_node = self.instance.secondary_nodes[0]
             # Otherwise self.target_node has been populated either
             # directly, or through an iallocator.
           self.all_nodes = [self.source_node, self.target_node]
           self.nodes_ip = dict((name, node.secondary_ip) for (name, node)
                                in self.cfg.GetMultiNodeInfo(self.all_nodes))
           if self.failover:
             feedback_fn("Failover instance %s" % self.instance.name)
             self._ExecFailover()
           else:
             feedback_fn("Migrating instance %s" % self.instance.name)
             if self.cleanup:
               return self._ExecCleanup()
             else:
               return self._ExecMigration()
       def _CreateBlockDev(lu, node, instance, device, force_create,
                           info, force_open):
         """Create a tree of block devices on a given node.
         If this device type has to be created on secondaries, create it and
         all its children.
         If not, just recurse to children keeping the same 'force' value.
         @param lu: the lu on whose behalf we execute
         @param node: the node on which to create the device
         @type instance: L{objects.Instance}
         @param instance: the instance which owns the device
         @type device: L{objects.Disk}
         @param device: the device to create
         @type force_create: boolean
         @param force_create: whether to force creation of this device; this
             will be change to True whenever we find a device which has
             CreateOnSecondary() attribute
         @param info: the extra 'metadata' we should attach to the device
             (this will be represented as a LVM tag)
         @type force_open: boolean
         @param force_open: this parameter will be passes to the
             L{backend.BlockdevCreate} function where it specifies
             whether we run on primary or not, and it affects both
             the child assembly and the device own Open() execution
         """
         if device.CreateOnSecondary():
           force_create = True
         if device.children:
           for child in device.children:
             _CreateBlockDev(lu, node, instance, child, force_create,
                             info, force_open)
         if not force_create:
           return
         _CreateSingleBlockDev(lu, node, instance, device, info, force_open)
       def _CreateSingleBlockDev(lu, node, instance, device, info, force_open):
         """Create a single block device on a given node.
         This will not recurse over children of the device, so they must be
         created in advance.
         @param lu: the lu on whose behalf we execute
         @param node: the node on which to create the device
         @type instance: L{objects.Instance}
         @param instance: the instance which owns the device
         @type device: L{objects.Disk}
         @param device: the device to create
         @param info: the extra 'metadata' we should attach to the device
             (this will be represented as a LVM tag)
         @type force_open: boolean
         @param force_open: this parameter will be passes to the
             L{backend.BlockdevCreate} function where it specifies
             whether we run on primary or not, and it affects both
             the child assembly and the device own Open() execution
         """
         lu.cfg.SetDiskID(device, node)
         result = lu.rpc.call_blockdev_create(node, device, device.size,
                                              instance.name, force_open, info)
         result.Raise("Can't create block device %s on"
                      " node %s for instance %s" % (device, node, instance.name))
         if device.physical_id is None:
           device.physical_id = result.payload
       def _GenerateUniqueNames(lu, exts):
         """Generate a suitable LV name.
         This will generate a logical volume name for the given instance.
         """
         results = []
         for val in exts:
           new_id = lu.cfg.GenerateUniqueID(lu.proc.GetECId())
           results.append("%s%s" % (new_id, val))
         return results
       def _ComputeLDParams(disk_template, disk_params):
         """Computes Logical Disk parameters from Disk Template parameters.
         @type disk_template: string
         @param disk_template: disk template, one of L{constants.DISK_TEMPLATES}
         @type disk_params: dict
         @param disk_params: disk template parameters; dict(template_name -> parameters
         @rtype: list(dict)
         @return: a list of dicts, one for each node of the disk hierarchy. Each dict
           contains the LD parameters of the node. The tree is flattened in-order.
         """
         if disk_template not in constants.DISK_TEMPLATES:
           raise errors.ProgrammerError("Unknown disk template %s" % disk_template)
         result = list()
         dt_params = disk_params[disk_template]
         if disk_template == constants.DT_DRBD8:
           drbd_params = {
             constants.RESYNC_RATE: dt_params[constants.DRBD_RESYNC_RATE],
             constants.BARRIERS: dt_params[constants.DRBD_DISK_BARRIERS],
             constants.NO_META_FLUSH: dt_params[constants.DRBD_META_BARRIERS],
+            }
           drbd_params = \
             objects.FillDict(constants.DISK_LD_DEFAULTS[constants.LD_DRBD8],
                              drbd_params)
           result.append(drbd_params)
           # data LV
           data_params = {
             constants.STRIPES: dt_params[constants.DRBD_DATA_STRIPES],
+            }
           data_params = \
             objects.FillDict(constants.DISK_LD_DEFAULTS[constants.LD_LV],
                              data_params)
           result.append(data_params)
           # metadata LV
           meta_params = {
             constants.STRIPES: dt_params[constants.DRBD_META_STRIPES],
+            }
           meta_params = \
             objects.FillDict(constants.DISK_LD_DEFAULTS[constants.LD_LV],
                              meta_params)
           result.append(meta_params)
         elif (disk_template == constants.DT_FILE or
               disk_template == constants.DT_SHARED_FILE):
           result.append(constants.DISK_LD_DEFAULTS[constants.LD_FILE])
         elif disk_template == constants.DT_PLAIN:
           params = {
             constants.STRIPES: dt_params[constants.LV_STRIPES],
+            }
           params = \
             objects.FillDict(constants.DISK_LD_DEFAULTS[constants.LD_LV],
                              params)
           result.append(params)
         elif disk_template == constants.DT_BLOCK:
           result.append(constants.DISK_LD_DEFAULTS[constants.LD_BLOCKDEV])
         return result
       def _GenerateDRBD8Branch(lu, primary, secondary, size, vgnames, names,
                                iv_name, p_minor, s_minor, drbd_params, data_params,
                                meta_params):
         """Generate a drbd8 device complete with its children.
         """
         assert len(vgnames) == len(names) == 2
         port = lu.cfg.AllocatePort()
         shared_secret = lu.cfg.GenerateDRBDSecret(lu.proc.GetECId())
         dev_data = objects.Disk(dev_type=constants.LD_LV, size=size,
                                 logical_id=(vgnames[0], names[0]),
                                 params=data_params)
         dev_meta = objects.Disk(dev_type=constants.LD_LV, size=DRBD_META_SIZE,
                                 logical_id=(vgnames[1], names[1]),
                                 params=meta_params)
         drbd_dev = objects.Disk(dev_type=constants.LD_DRBD8, size=size,
                                 logical_id=(primary, secondary, port,
                                             p_minor, s_minor,
                                             shared_secret),
                                 children=[dev_data, dev_meta],
                                 iv_name=iv_name, params=drbd_params)
         return drbd_dev
       def _GenerateDiskTemplate(lu, template_name,
                                 instance_name, primary_node,
                                 secondary_nodes, disk_info,
                                 file_storage_dir, file_driver,
                                 base_index, feedback_fn, disk_params):
         """Generate the entire disk layout for a given template type.
         """
         #TODO: compute space requirements
         vgname = lu.cfg.GetVGName()
         disk_count = len(disk_info)
         disks = []
         ld_params = _ComputeLDParams(template_name, disk_params)
         if template_name == constants.DT_DISKLESS:
           pass
         elif template_name == constants.DT_PLAIN:
           if len(secondary_nodes) != 0:
             raise errors.ProgrammerError("Wrong template configuration")
           names = _GenerateUniqueNames(lu, [".disk%d" % (base_index + i)
                                             for i in range(disk_count)])
           for idx, disk in enumerate(disk_info):
             disk_index = idx + base_index
             vg = disk.get(constants.IDISK_VG, vgname)
             feedback_fn("* disk %i, vg %s, name %s" % (idx, vg, names[idx]))
             disk_dev = objects.Disk(dev_type=constants.LD_LV,
                                     size=disk[constants.IDISK_SIZE],
                                     logical_id=(vg, names[idx]),
                                     iv_name="disk/%d" % disk_index,
                                     mode=disk[constants.IDISK_MODE],
                                     params=ld_params[0])
             disks.append(disk_dev)
         elif template_name == constants.DT_DRBD8:
           drbd_params, data_params, meta_params = ld_params
           if len(secondary_nodes) != 1:
             raise errors.ProgrammerError("Wrong template configuration")
           remote_node = secondary_nodes[0]
           minors = lu.cfg.AllocateDRBDMinor(
             [primary_node, remote_node] * len(disk_info), instance_name)
           names = []
           for lv_prefix in _GenerateUniqueNames(lu, [".disk%d" % (base_index + i)
                                                      for i in range(disk_count)]):
             names.append(lv_prefix + "_data")
             names.append(lv_prefix + "_meta")
           for idx, disk in enumerate(disk_info):
             disk_index = idx + base_index
             data_vg = disk.get(constants.IDISK_VG, vgname)
             meta_vg = disk.get(constants.IDISK_METAVG, data_vg)
             disk_dev = _GenerateDRBD8Branch(lu, primary_node, remote_node,
                                             disk[constants.IDISK_SIZE],
                                             [data_vg, meta_vg],
                                             names[idx * 2:idx * 2 + 2],
                                             "disk/%d" % disk_index,
                                             minors[idx * 2], minors[idx * 2 + 1],
                                             drbd_params, data_params, meta_params)
             disk_dev.mode = disk[constants.IDISK_MODE]
             disks.append(disk_dev)
         elif template_name == constants.DT_FILE:
           if len(secondary_nodes) != 0:
             raise errors.ProgrammerError("Wrong template configuration")
           opcodes.RequireFileStorage()
           for idx, disk in enumerate(disk_info):
             disk_index = idx + base_index
             disk_dev = objects.Disk(dev_type=constants.LD_FILE,
                                     size=disk[constants.IDISK_SIZE],
                                     iv_name="disk/%d" % disk_index,
                                     logical_id=(file_driver,
                                                 "%s/disk%d" % (file_storage_dir,
                                                                disk_index)),
                                     mode=disk[constants.IDISK_MODE],
                                     params=ld_params[0])
             disks.append(disk_dev)
         elif template_name == constants.DT_SHARED_FILE:
           if len(secondary_nodes) != 0:
             raise errors.ProgrammerError("Wrong template configuration")
           opcodes.RequireSharedFileStorage()
           for idx, disk in enumerate(disk_info):
             disk_index = idx + base_index
             disk_dev = objects.Disk(dev_type=constants.LD_FILE,
                                     size=disk[constants.IDISK_SIZE],
                                     iv_name="disk/%d" % disk_index,
                                     logical_id=(file_driver,
                                                 "%s/disk%d" % (file_storage_dir,
                                                                disk_index)),
                                     mode=disk[constants.IDISK_MODE],
                                     params=ld_params[0])
             disks.append(disk_dev)
         elif template_name == constants.DT_BLOCK:
           if len(secondary_nodes) != 0:
             raise errors.ProgrammerError("Wrong template configuration")
           for idx, disk in enumerate(disk_info):
             disk_index = idx + base_index
             disk_dev = objects.Disk(dev_type=constants.LD_BLOCKDEV,
                                     size=disk[constants.IDISK_SIZE],
                                     logical_id=(constants.BLOCKDEV_DRIVER_MANUAL,
                                                 disk[constants.IDISK_ADOPT]),
                                     iv_name="disk/%d" % disk_index,
                                     mode=disk[constants.IDISK_MODE],
                                     params=ld_params[0])
             disks.append(disk_dev)
         else:
           raise errors.ProgrammerError("Invalid disk template '%s'" % template_name)
         return disks
       def _GetInstanceInfoText(instance):
         """Compute that text that should be added to the disk's metadata.
         """
         return "originstname+%s" % instance.name
       def _CalcEta(time_taken, written, total_size):
         """Calculates the ETA based on size written and total size.
         @param time_taken: The time taken so far
         @param written: amount written so far
         @param total_size: The total size of data to be written
         @return: The remaining time in seconds
         """
         avg_time = time_taken / float(written)
         return (total_size - written) * avg_time
       def _WipeDisks(lu, instance):
         """Wipes instance disks.
         @type lu: L{LogicalUnit}
         @param lu: the logical unit on whose behalf we execute
         @type instance: L{objects.Instance}
         @param instance: the instance whose disks we should create
         @return: the success of the wipe
         """
         node = instance.primary_node
         for device in instance.disks:
           lu.cfg.SetDiskID(device, node)
         logging.info("Pause sync of instance %s disks", instance.name)
         result = lu.rpc.call_blockdev_pause_resume_sync(node, instance.disks, True)
         for idx, success in enumerate(result.payload):
           if not success:
             logging.warn("pause-sync of instance %s for disks %d failed",
                          instance.name, idx)
         try:
           for idx, device in enumerate(instance.disks):
             # The wipe size is MIN_WIPE_CHUNK_PERCENT % of the instance disk but
             # MAX_WIPE_CHUNK at max
             wipe_chunk_size = min(constants.MAX_WIPE_CHUNK, device.size / 100.0 *
                                   constants.MIN_WIPE_CHUNK_PERCENT)
             # we _must_ make this an int, otherwise rounding errors will
             # occur
             wipe_chunk_size = int(wipe_chunk_size)
             lu.LogInfo("* Wiping disk %d", idx)
             logging.info("Wiping disk %d for instance %s, node %s using"
                          " chunk size %s", idx, instance.name, node, wipe_chunk_size)
             offset = 0
             size = device.size
             last_output = 0
             start_time = time.time()
             while offset < size:
               wipe_size = min(wipe_chunk_size, size - offset)
               logging.debug("Wiping disk %d, offset %s, chunk %s",
                             idx, offset, wipe_size)
               result = lu.rpc.call_blockdev_wipe(node, device, offset, wipe_size)
               result.Raise("Could not wipe disk %d at offset %d for size %d" %
                            (idx, offset, wipe_size))
               now = time.time()
               offset += wipe_size
               if now - last_output >= 60:
                 eta = _CalcEta(now - start_time, offset, size)
                 lu.LogInfo(" - done: %.1f%% ETA: %s" %
                            (offset / float(size) * 100, utils.FormatSeconds(eta)))
                 last_output = now
         finally:
           logging.info("Resume sync of instance %s disks", instance.name)
           result = lu.rpc.call_blockdev_pause_resume_sync(node, instance.disks, False)
           for idx, success in enumerate(result.payload):
             if not success:
               lu.LogWarning("Resume sync of disk %d failed, please have a"
                             " look at the status and troubleshoot the issue", idx)
               logging.warn("resume-sync of instance %s for disks %d failed",
                            instance.name, idx)
       def _CreateDisks(lu, instance, to_skip=None, target_node=None):
         """Create all disks for an instance.
         This abstracts away some work from AddInstance.
         @type lu: L{LogicalUnit}
         @param lu: the logical unit on whose behalf we execute
         @type instance: L{objects.Instance}
         @param instance: the instance whose disks we should create
         @type to_skip: list
         @param to_skip: list of indices to skip
         @type target_node: string
         @param target_node: if passed, overrides the target node for creation
         @rtype: boolean
         @return: the success of the creation
         """
         info = _GetInstanceInfoText(instance)
         if target_node is None:
           pnode = instance.primary_node
           all_nodes = instance.all_nodes
         else:
           pnode = target_node
           all_nodes = [pnode]
         if instance.disk_template in constants.DTS_FILEBASED:
           file_storage_dir = os.path.dirname(instance.disks[0].logical_id[1])
           result = lu.rpc.call_file_storage_dir_create(pnode, file_storage_dir)
           result.Raise("Failed to create directory '%s' on"
                        " node %s" % (file_storage_dir, pnode))
         # Note: this needs to be kept in sync with adding of disks in
         # LUInstanceSetParams
         for idx, device in enumerate(instance.disks):
           if to_skip and idx in to_skip:
             continue
           logging.info("Creating volume %s for instance %s",
                        device.iv_name, instance.name)
           #HARDCODE
           for node in all_nodes:
             f_create = node == pnode
             _CreateBlockDev(lu, node, instance, device, f_create, info, f_create)
       def _RemoveDisks(lu, instance, target_node=None):
         """Remove all disks for an instance.
         This abstracts away some work from `AddInstance()` and
         `RemoveInstance()`. Note that in case some of the devices couldn't
         be removed, the removal will continue with the other ones (compare
         with `_CreateDisks()`).
         @type lu: L{LogicalUnit}
         @param lu: the logical unit on whose behalf we execute
         @type instance: L{objects.Instance}
         @param instance: the instance whose disks we should remove
         @type target_node: string
         @param target_node: used to override the node on which to remove the disks
         @rtype: boolean
         @return: the success of the removal
         """
         logging.info("Removing block devices for instance %s", instance.name)
         all_result = True
         for device in instance.disks:
           if target_node:
             edata = [(target_node, device)]
           else:
             edata = device.ComputeNodeTree(instance.primary_node)
           for node, disk in edata:
             lu.cfg.SetDiskID(disk, node)
             msg = lu.rpc.call_blockdev_remove(node, disk).fail_msg
             if msg:
               lu.LogWarning("Could not remove block device %s on node %s,"
                             " continuing anyway: %s", device.iv_name, node, msg)
               all_result = False
           # if this is a DRBD disk, return its port to the pool
           if device.dev_type in constants.LDS_DRBD:
             tcp_port = device.logical_id[2]
             lu.cfg.AddTcpUdpPort(tcp_port)
         if instance.disk_template == constants.DT_FILE:
           file_storage_dir = os.path.dirname(instance.disks[0].logical_id[1])
           if target_node:
             tgt = target_node
           else:
             tgt = instance.primary_node
           result = lu.rpc.call_file_storage_dir_remove(tgt, file_storage_dir)
           if result.fail_msg:
             lu.LogWarning("Could not remove directory '%s' on node %s: %s",
                           file_storage_dir, instance.primary_node, result.fail_msg)
             all_result = False
         return all_result
       def _ComputeDiskSizePerVG(disk_template, disks):
         """Compute disk size requirements in the volume group
         """
         def _compute(disks, payload):
           """Universal algorithm.
           """
           vgs = {}
           for disk in disks:
             vgs[disk[constants.IDISK_VG]] = \
               vgs.get(constants.IDISK_VG, 0) + disk[constants.IDISK_SIZE] + payload
           return vgs
         # Required free disk space as a function of disk and swap space
         req_size_dict = {
           constants.DT_DISKLESS: {},
           constants.DT_PLAIN: _compute(disks, 0),
           # 128 MB are added for drbd metadata for each disk
           constants.DT_DRBD8: _compute(disks, DRBD_META_SIZE),
           constants.DT_FILE: {},
           constants.DT_SHARED_FILE: {},
+        }
         if disk_template not in req_size_dict:
           raise errors.ProgrammerError("Disk template '%s' size requirement"
                                        " is unknown" % disk_template)
         return req_size_dict[disk_template]
       def _ComputeDiskSize(disk_template, disks):
         """Compute disk size requirements in the volume group
         """
         # Required free disk space as a function of disk and swap space
         req_size_dict = {
           constants.DT_DISKLESS: None,
           constants.DT_PLAIN: sum(d[constants.IDISK_SIZE] for d in disks),
           # 128 MB are added for drbd metadata for each disk
           constants.DT_DRBD8:
             sum(d[constants.IDISK_SIZE] + DRBD_META_SIZE for d in disks),
           constants.DT_FILE: None,
           constants.DT_SHARED_FILE: 0,
           constants.DT_BLOCK: 0,
+        }
         if disk_template not in req_size_dict:
           raise errors.ProgrammerError("Disk template '%s' size requirement"
                                        " is unknown" % disk_template)
         return req_size_dict[disk_template]
       def _FilterVmNodes(lu, nodenames):
         """Filters out non-vm_capable nodes from a list.
         @type lu: L{LogicalUnit}
         @param lu: the logical unit for which we check
         @type nodenames: list
         @param nodenames: the list of nodes on which we should check
         @rtype: list
         @return: the list of vm-capable nodes
         """
         vm_nodes = frozenset(lu.cfg.GetNonVmCapableNodeList())
         return [name for name in nodenames if name not in vm_nodes]
       def _CheckHVParams(lu, nodenames, hvname, hvparams):
         """Hypervisor parameter validation.
         This function abstract the hypervisor parameter validation to be
         used in both instance create and instance modify.
         @type lu: L{LogicalUnit}
         @param lu: the logical unit for which we check
         @type nodenames: list
         @param nodenames: the list of nodes on which we should check
         @type hvname: string
         @param hvname: the name of the hypervisor we should use
         @type hvparams: dict
         @param hvparams: the parameters which we need to check
         @raise errors.OpPrereqError: if the parameters are not valid
         """
         nodenames = _FilterVmNodes(lu, nodenames)
         cluster = lu.cfg.GetClusterInfo()
         hvfull = objects.FillDict(cluster.hvparams.get(hvname, {}), hvparams)
         hvinfo = lu.rpc.call_hypervisor_validate_params(nodenames, hvname, hvfull)
         for node in nodenames:
           info = hvinfo[node]
           if info.offline:
             continue
           info.Raise("Hypervisor parameter validation failed on node %s" % node)
       def _CheckOSParams(lu, required, nodenames, osname, osparams):
         """OS parameters validation.
         @type lu: L{LogicalUnit}
         @param lu: the logical unit for which we check
         @type required: boolean
         @param required: whether the validation should fail if the OS is not
             found
         @type nodenames: list
         @param nodenames: the list of nodes on which we should check
         @type osname: string
         @param osname: the name of the hypervisor we should use
         @type osparams: dict
         @param osparams: the parameters which we need to check
         @raise errors.OpPrereqError: if the parameters are not valid
         """
         nodenames = _FilterVmNodes(lu, nodenames)
         result = lu.rpc.call_os_validate(nodenames, required, osname,
                                          [constants.OS_VALIDATE_PARAMETERS],
                                          osparams)
         for node, nres in result.items():
           # we don't check for offline cases since this should be run only
           # against the master node and/or an instance's nodes
           nres.Raise("OS Parameters validation failed on node %s" % node)
           if not nres.payload:
             lu.LogInfo("OS %s not found on node %s, validation skipped",
                        osname, node)
       class LUInstanceCreate(LogicalUnit):
         """Create an instance.
         """
         HPATH = "instance-add"
         HTYPE = constants.HTYPE_INSTANCE
         REQ_BGL = False
         def CheckArguments(self):
           """Check arguments.
           """
           # do not require name_check to ease forward/backward compatibility
           # for tools
           if self.op.no_install and self.op.start:
             self.LogInfo("No-installation mode selected, disabling startup")
             self.op.start = False
           # validate/normalize the instance name
           self.op.instance_name = \
             netutils.Hostname.GetNormalizedName(self.op.instance_name)
           if self.op.ip_check and not self.op.name_check:
             # TODO: make the ip check more flexible and not depend on the name check
             raise errors.OpPrereqError("Cannot do IP address check without a name"
                                        " check", errors.ECODE_INVAL)
           # check nics' parameter names
           for nic in self.op.nics:
             utils.ForceDictType(nic, constants.INIC_PARAMS_TYPES)
           # check disks. parameter names and consistent adopt/no-adopt strategy
           has_adopt = has_no_adopt = False
           for disk in self.op.disks:
             utils.ForceDictType(disk, constants.IDISK_PARAMS_TYPES)
             if constants.IDISK_ADOPT in disk:
               has_adopt = True
             else:
               has_no_adopt = True
           if has_adopt and has_no_adopt:
             raise errors.OpPrereqError("Either all disks are adopted or none is",
                                        errors.ECODE_INVAL)
           if has_adopt:
             if self.op.disk_template not in constants.DTS_MAY_ADOPT:
               raise errors.OpPrereqError("Disk adoption is not supported for the"
                                          " '%s' disk template" %
                                          self.op.disk_template,
                                          errors.ECODE_INVAL)
             if self.op.iallocator is not None:
               raise errors.OpPrereqError("Disk adoption not allowed with an"
                                          " iallocator script", errors.ECODE_INVAL)
             if self.op.mode == constants.INSTANCE_IMPORT:
               raise errors.OpPrereqError("Disk adoption not allowed for"
                                          " instance import", errors.ECODE_INVAL)
           else:
             if self.op.disk_template in constants.DTS_MUST_ADOPT:
               raise errors.OpPrereqError("Disk template %s requires disk adoption,"
                                          " but no 'adopt' parameter given" %
                                          self.op.disk_template,
                                          errors.ECODE_INVAL)
           self.adopt_disks = has_adopt
           # instance name verification
           if self.op.name_check:
             self.hostname1 = netutils.GetHostname(name=self.op.instance_name)
             self.op.instance_name = self.hostname1.name
             # used in CheckPrereq for ip ping check
             self.check_ip = self.hostname1.ip
           else:
             self.check_ip = None
           # file storage checks
           if (self.op.file_driver and
               not self.op.file_driver in constants.FILE_DRIVER):
             raise errors.OpPrereqError("Invalid file driver name '%s'" %
                                        self.op.file_driver, errors.ECODE_INVAL)
           if self.op.disk_template == constants.DT_FILE:
             opcodes.RequireFileStorage()
           elif self.op.disk_template == constants.DT_SHARED_FILE:
             opcodes.RequireSharedFileStorage()
           ### Node/iallocator related checks
           _CheckIAllocatorOrNode(self, "iallocator", "pnode")
           if self.op.pnode is not None:
             if self.op.disk_template in constants.DTS_INT_MIRROR:
               if self.op.snode is None:
                 raise errors.OpPrereqError("The networked disk templates need"
                                            " a mirror node", errors.ECODE_INVAL)
             elif self.op.snode:
               self.LogWarning("Secondary node will be ignored on non-mirrored disk"
                               " template")
               self.op.snode = None
           self._cds = _GetClusterDomainSecret()
           if self.op.mode == constants.INSTANCE_IMPORT:
             # On import force_variant must be True, because if we forced it at
             # initial install, our only chance when importing it back is that it
             # works again!
             self.op.force_variant = True
             if self.op.no_install:
               self.LogInfo("No-installation mode has no effect during import")
           elif self.op.mode == constants.INSTANCE_CREATE:
             if self.op.os_type is None:
               raise errors.OpPrereqError("No guest OS specified",
                                          errors.ECODE_INVAL)
             if self.op.os_type in self.cfg.GetClusterInfo().blacklisted_os:
               raise errors.OpPrereqError("Guest OS '%s' is not allowed for"
                                          " installation" % self.op.os_type,
                                          errors.ECODE_STATE)
             if self.op.disk_template is None:
               raise errors.OpPrereqError("No disk template specified",
                                          errors.ECODE_INVAL)
           elif self.op.mode == constants.INSTANCE_REMOTE_IMPORT:
             # Check handshake to ensure both clusters have the same domain secret
             src_handshake = self.op.source_handshake
             if not src_handshake:
               raise errors.OpPrereqError("Missing source handshake",
                                          errors.ECODE_INVAL)
             errmsg = masterd.instance.CheckRemoteExportHandshake(self._cds,
                                                                  src_handshake)
             if errmsg:
               raise errors.OpPrereqError("Invalid handshake: %s" % errmsg,
                                          errors.ECODE_INVAL)
             # Load and check source CA
             self.source_x509_ca_pem = self.op.source_x509_ca
             if not self.source_x509_ca_pem:
               raise errors.OpPrereqError("Missing source X509 CA",
                                          errors.ECODE_INVAL)
             try:
               (cert, _) = utils.LoadSignedX509Certificate(self.source_x509_ca_pem,
                                                           self._cds)
             except OpenSSL.crypto.Error, err:
               raise errors.OpPrereqError("Unable to load source X509 CA (%s)" %
                                          (err, ), errors.ECODE_INVAL)
             (errcode, msg) = utils.VerifyX509Certificate(cert, None, None)
             if errcode is not None:
               raise errors.OpPrereqError("Invalid source X509 CA (%s)" % (msg, ),
                                          errors.ECODE_INVAL)
             self.source_x509_ca = cert
             src_instance_name = self.op.source_instance_name
             if not src_instance_name:
               raise errors.OpPrereqError("Missing source instance name",
                                          errors.ECODE_INVAL)
             self.source_instance_name = \
                 netutils.GetHostname(name=src_instance_name).name
           else:
             raise errors.OpPrereqError("Invalid instance creation mode %r" %
                                        self.op.mode, errors.ECODE_INVAL)
         def ExpandNames(self):
           """ExpandNames for CreateInstance.
           Figure out the right locks for instance creation.
           """
           self.needed_locks = {}
           instance_name = self.op.instance_name
           # this is just a preventive check, but someone might still add this
           # instance in the meantime, and creation will fail at lock-add time
           if instance_name in self.cfg.GetInstanceList():
             raise errors.OpPrereqError("Instance '%s' is already in the cluster" %
                                        instance_name, errors.ECODE_EXISTS)
           self.add_locks[locking.LEVEL_INSTANCE] = instance_name
           if self.op.iallocator:
             # TODO: Find a solution to not lock all nodes in the cluster, e.g. by
             # specifying a group on instance creation and then selecting nodes from
             # that group
             self.needed_locks[locking.LEVEL_NODE] = locking.ALL_SET
             self.needed_locks[locking.LEVEL_NODE_RES] = locking.ALL_SET
           else:
             self.op.pnode = _ExpandNodeName(self.cfg, self.op.pnode)
             nodelist = [self.op.pnode]
             if self.op.snode is not None:
               self.op.snode = _ExpandNodeName(self.cfg, self.op.snode)
               nodelist.append(self.op.snode)
             self.needed_locks[locking.LEVEL_NODE] = nodelist
             # Lock resources of instance's primary and secondary nodes (copy to
             # prevent accidential modification)
             self.needed_locks[locking.LEVEL_NODE_RES] = list(nodelist)
           # in case of import lock the source node too
           if self.op.mode == constants.INSTANCE_IMPORT:
             src_node = self.op.src_node
             src_path = self.op.src_path
             if src_path is None:
               self.op.src_path = src_path = self.op.instance_name
             if src_node is None:
               self.needed_locks[locking.LEVEL_NODE] = locking.ALL_SET
               self.op.src_node = None
               if os.path.isabs(src_path):
                 raise errors.OpPrereqError("Importing an instance from a path"
                                            " requires a source node option",
                                            errors.ECODE_INVAL)
             else:
               self.op.src_node = src_node = _ExpandNodeName(self.cfg, src_node)
               if self.needed_locks[locking.LEVEL_NODE] is not locking.ALL_SET:
                 self.needed_locks[locking.LEVEL_NODE].append(src_node)
               if not os.path.isabs(src_path):
                 self.op.src_path = src_path = \
                   utils.PathJoin(constants.EXPORT_DIR, src_path)
         def _RunAllocator(self):
           """Run the allocator based on input opcode.
           """
           nics = [n.ToDict() for n in self.nics]
           ial = IAllocator(self.cfg, self.rpc,
                            mode=constants.IALLOCATOR_MODE_ALLOC,
                            name=self.op.instance_name,
                            disk_template=self.op.disk_template,
                            tags=self.op.tags,
                            os=self.op.os_type,
                            vcpus=self.be_full[constants.BE_VCPUS],
                            memory=self.be_full[constants.BE_MAXMEM],
                            disks=self.disks,
                            nics=nics,
                            hypervisor=self.op.hypervisor,
+                           )
           ial.Run(self.op.iallocator)
           if not ial.success:
             raise errors.OpPrereqError("Can't compute nodes using"
                                        " iallocator '%s': %s" %
                                        (self.op.iallocator, ial.info),
                                        errors.ECODE_NORES)
           if len(ial.result) != ial.required_nodes:
             raise errors.OpPrereqError("iallocator '%s' returned invalid number"
                                        " of nodes (%s), required %s" %
                                        (self.op.iallocator, len(ial.result),
                                         ial.required_nodes), errors.ECODE_FAULT)
           self.op.pnode = ial.result[0]
           self.LogInfo("Selected nodes for instance %s via iallocator %s: %s",
                        self.op.instance_name, self.op.iallocator,
                        utils.CommaJoin(ial.result))
           if ial.required_nodes == 2:
             self.op.snode = ial.result[1]
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on master, primary and secondary nodes of the instance.
           """
           env = {
             "ADD_MODE": self.op.mode,
+            }
           if self.op.mode == constants.INSTANCE_IMPORT:
             env["SRC_NODE"] = self.op.src_node
             env["SRC_PATH"] = self.op.src_path
             env["SRC_IMAGES"] = self.src_images
           env.update(_BuildInstanceHookEnv(
             name=self.op.instance_name,
             primary_node=self.op.pnode,
             secondary_nodes=self.secondaries,
             status=self.op.start,
             os_type=self.op.os_type,
             minmem=self.be_full[constants.BE_MINMEM],
             maxmem=self.be_full[constants.BE_MAXMEM],
             vcpus=self.be_full[constants.BE_VCPUS],
             nics=_NICListToTuple(self, self.nics),
             disk_template=self.op.disk_template,
             disks=[(d[constants.IDISK_SIZE], d[constants.IDISK_MODE])
                    for d in self.disks],
             bep=self.be_full,
             hvp=self.hv_full,
             hypervisor_name=self.op.hypervisor,
             tags=self.op.tags,
           ))
           return env
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           nl = [self.cfg.GetMasterNode(), self.op.pnode] + self.secondaries
           return nl, nl
         def _ReadExportInfo(self):
           """Reads the export information from disk.
           It will override the opcode source node and path with the actual
           information, if these two were not specified before.
           @return: the export information
           """
           assert self.op.mode == constants.INSTANCE_IMPORT
           src_node = self.op.src_node
           src_path = self.op.src_path
           if src_node is None:
             locked_nodes = self.owned_locks(locking.LEVEL_NODE)
             exp_list = self.rpc.call_export_list(locked_nodes)
             found = False
             for node in exp_list:
               if exp_list[node].fail_msg:
                 continue
               if src_path in exp_list[node].payload:
                 found = True
                 self.op.src_node = src_node = node
                 self.op.src_path = src_path = utils.PathJoin(constants.EXPORT_DIR,
                                                              src_path)
                 break
             if not found:
               raise errors.OpPrereqError("No export found for relative path %s" %
                                           src_path, errors.ECODE_INVAL)
           _CheckNodeOnline(self, src_node)
           result = self.rpc.call_export_info(src_node, src_path)
           result.Raise("No export or invalid export found in dir %s" % src_path)
           export_info = objects.SerializableConfigParser.Loads(str(result.payload))
           if not export_info.has_section(constants.INISECT_EXP):
             raise errors.ProgrammerError("Corrupted export config",
                                          errors.ECODE_ENVIRON)
           ei_version = export_info.get(constants.INISECT_EXP, "version")
           if (int(ei_version) != constants.EXPORT_VERSION):
             raise errors.OpPrereqError("Wrong export version %s (wanted %d)" %
                                        (ei_version, constants.EXPORT_VERSION),
                                        errors.ECODE_ENVIRON)
           return export_info
         def _ReadExportParams(self, einfo):
           """Use export parameters as defaults.
           In case the opcode doesn't specify (as in override) some instance
           parameters, then try to use them from the export information, if
           that declares them.
           """
           self.op.os_type = einfo.get(constants.INISECT_EXP, "os")
           if self.op.disk_template is None:
             if einfo.has_option(constants.INISECT_INS, "disk_template"):
               self.op.disk_template = einfo.get(constants.INISECT_INS,
                                                 "disk_template")
               if self.op.disk_template not in constants.DISK_TEMPLATES:
                 raise errors.OpPrereqError("Disk template specified in configuration"
                                            " file is not one of the allowed values:"
                                            " %s" % " ".join(constants.DISK_TEMPLATES))
             else:
               raise errors.OpPrereqError("No disk template specified and the export"
                                          " is missing the disk_template information",
                                          errors.ECODE_INVAL)
           if not self.op.disks:
             disks = []
             # TODO: import the disk iv_name too
             for idx in range(constants.MAX_DISKS):
               if einfo.has_option(constants.INISECT_INS, "disk%d_size" % idx):
                 disk_sz = einfo.getint(constants.INISECT_INS, "disk%d_size" % idx)
                 disks.append({constants.IDISK_SIZE: disk_sz})
             self.op.disks = disks
             if not disks and self.op.disk_template != constants.DT_DISKLESS:
               raise errors.OpPrereqError("No disk info specified and the export"
                                          " is missing the disk information",
                                          errors.ECODE_INVAL)
           if not self.op.nics:
             nics = []
             for idx in range(constants.MAX_NICS):
               if einfo.has_option(constants.INISECT_INS, "nic%d_mac" % idx):
                 ndict = {}
                 for name in list(constants.NICS_PARAMETERS) + ["ip", "mac"]:
                   v = einfo.get(constants.INISECT_INS, "nic%d_%s" % (idx, name))
                   ndict[name] = v
                 nics.append(ndict)
               else:
                 break
             self.op.nics = nics
           if not self.op.tags and einfo.has_option(constants.INISECT_INS, "tags"):
             self.op.tags = einfo.get(constants.INISECT_INS, "tags").split()
           if (self.op.hypervisor is None and
               einfo.has_option(constants.INISECT_INS, "hypervisor")):
             self.op.hypervisor = einfo.get(constants.INISECT_INS, "hypervisor")
           if einfo.has_section(constants.INISECT_HYP):
             # use the export parameters but do not override the ones
             # specified by the user
             for name, value in einfo.items(constants.INISECT_HYP):
               if name not in self.op.hvparams:
                 self.op.hvparams[name] = value
           if einfo.has_section(constants.INISECT_BEP):
             # use the parameters, without overriding
             for name, value in einfo.items(constants.INISECT_BEP):
               if name not in self.op.beparams:
                 self.op.beparams[name] = value
               # Compatibility for the old "memory" be param
               if name == constants.BE_MEMORY:
                 if constants.BE_MAXMEM not in self.op.beparams:
                   self.op.beparams[constants.BE_MAXMEM] = value
                 if constants.BE_MINMEM not in self.op.beparams:
                   self.op.beparams[constants.BE_MINMEM] = value
           else:
             # try to read the parameters old style, from the main section
             for name in constants.BES_PARAMETERS:
               if (name not in self.op.beparams and
                   einfo.has_option(constants.INISECT_INS, name)):
                 self.op.beparams[name] = einfo.get(constants.INISECT_INS, name)
           if einfo.has_section(constants.INISECT_OSP):
             # use the parameters, without overriding
             for name, value in einfo.items(constants.INISECT_OSP):
               if name not in self.op.osparams:
                 self.op.osparams[name] = value
         def _RevertToDefaults(self, cluster):
           """Revert the instance parameters to the default values.
           """
           # hvparams
           hv_defs = cluster.SimpleFillHV(self.op.hypervisor, self.op.os_type, {})
           for name in self.op.hvparams.keys():
             if name in hv_defs and hv_defs[name] == self.op.hvparams[name]:
               del self.op.hvparams[name]
           # beparams
           be_defs = cluster.SimpleFillBE({})
           for name in self.op.beparams.keys():
             if name in be_defs and be_defs[name] == self.op.beparams[name]:
               del self.op.beparams[name]
           # nic params
           nic_defs = cluster.SimpleFillNIC({})
           for nic in self.op.nics:
             for name in constants.NICS_PARAMETERS:
               if name in nic and name in nic_defs and nic[name] == nic_defs[name]:
                 del nic[name]
           # osparams
           os_defs = cluster.SimpleFillOS(self.op.os_type, {})
           for name in self.op.osparams.keys():
             if name in os_defs and os_defs[name] == self.op.osparams[name]:
               del self.op.osparams[name]
         def _CalculateFileStorageDir(self):
           """Calculate final instance file storage dir.
           """
           # file storage dir calculation/check
           self.instance_file_storage_dir = None
           if self.op.disk_template in constants.DTS_FILEBASED:
             # build the full file storage dir path
             joinargs = []
             if self.op.disk_template == constants.DT_SHARED_FILE:
               get_fsd_fn = self.cfg.GetSharedFileStorageDir
             else:
               get_fsd_fn = self.cfg.GetFileStorageDir
             cfg_storagedir = get_fsd_fn()
             if not cfg_storagedir:
               raise errors.OpPrereqError("Cluster file storage dir not defined")
             joinargs.append(cfg_storagedir)
             if self.op.file_storage_dir is not None:
               joinargs.append(self.op.file_storage_dir)
             joinargs.append(self.op.instance_name)
             # pylint: disable=W0142
             self.instance_file_storage_dir = utils.PathJoin(*joinargs)
         def CheckPrereq(self):
           """Check prerequisites.
           """
           self._CalculateFileStorageDir()
           if self.op.mode == constants.INSTANCE_IMPORT:
             export_info = self._ReadExportInfo()
             self._ReadExportParams(export_info)
           if (not self.cfg.GetVGName() and
               self.op.disk_template not in constants.DTS_NOT_LVM):
             raise errors.OpPrereqError("Cluster does not support lvm-based"
                                        " instances", errors.ECODE_STATE)
           if (self.op.hypervisor is None or
               self.op.hypervisor == constants.VALUE_AUTO):
             self.op.hypervisor = self.cfg.GetHypervisorType()
           cluster = self.cfg.GetClusterInfo()
           enabled_hvs = cluster.enabled_hypervisors
           if self.op.hypervisor not in enabled_hvs:
             raise errors.OpPrereqError("Selected hypervisor (%s) not enabled in the"
                                        " cluster (%s)" % (self.op.hypervisor,
                                         ",".join(enabled_hvs)),
                                        errors.ECODE_STATE)
           # Check tag validity
           for tag in self.op.tags:
             objects.TaggableObject.ValidateTag(tag)
           # check hypervisor parameter syntax (locally)
           utils.ForceDictType(self.op.hvparams, constants.HVS_PARAMETER_TYPES)
           filled_hvp = cluster.SimpleFillHV(self.op.hypervisor, self.op.os_type,
                                             self.op.hvparams)
           hv_type = hypervisor.GetHypervisor(self.op.hypervisor)
           hv_type.CheckParameterSyntax(filled_hvp)
           self.hv_full = filled_hvp
           # check that we don't specify global parameters on an instance
           _CheckGlobalHvParams(self.op.hvparams)
           # fill and remember the beparams dict
           default_beparams = cluster.beparams[constants.PP_DEFAULT]
           for param, value in self.op.beparams.iteritems():
             if value == constants.VALUE_AUTO:
               self.op.beparams[param] = default_beparams[param]
           objects.UpgradeBeParams(self.op.beparams)
           utils.ForceDictType(self.op.beparams, constants.BES_PARAMETER_TYPES)
           self.be_full = cluster.SimpleFillBE(self.op.beparams)
           # build os parameters
           self.os_full = cluster.SimpleFillOS(self.op.os_type, self.op.osparams)
           # now that hvp/bep are in final format, let's reset to defaults,
           # if told to do so
           if self.op.identify_defaults:
             self._RevertToDefaults(cluster)
           # NIC buildup
           self.nics = []
           for idx, nic in enumerate(self.op.nics):
             nic_mode_req = nic.get(constants.INIC_MODE, None)
             nic_mode = nic_mode_req
             if nic_mode is None or nic_mode == constants.VALUE_AUTO:
               nic_mode = cluster.nicparams[constants.PP_DEFAULT][constants.NIC_MODE]
             # in routed mode, for the first nic, the default ip is 'auto'
             if nic_mode == constants.NIC_MODE_ROUTED and idx == 0:
               default_ip_mode = constants.VALUE_AUTO
             else:
               default_ip_mode = constants.VALUE_NONE
             # ip validity checks
             ip = nic.get(constants.INIC_IP, default_ip_mode)
             if ip is None or ip.lower() == constants.VALUE_NONE:
               nic_ip = None
             elif ip.lower() == constants.VALUE_AUTO:
               if not self.op.name_check:
                 raise errors.OpPrereqError("IP address set to auto but name checks"
                                            " have been skipped",
                                            errors.ECODE_INVAL)
               nic_ip = self.hostname1.ip
             else:
               if not netutils.IPAddress.IsValid(ip):
                 raise errors.OpPrereqError("Invalid IP address '%s'" % ip,
                                            errors.ECODE_INVAL)
               nic_ip = ip
             # TODO: check the ip address for uniqueness
             if nic_mode == constants.NIC_MODE_ROUTED and not nic_ip:
               raise errors.OpPrereqError("Routed nic mode requires an ip address",
                                          errors.ECODE_INVAL)
             # MAC address verification
             mac = nic.get(constants.INIC_MAC, constants.VALUE_AUTO)
             if mac not in (constants.VALUE_AUTO, constants.VALUE_GENERATE):
               mac = utils.NormalizeAndValidateMac(mac)
               try:
                 self.cfg.ReserveMAC(mac, self.proc.GetECId())
               except errors.ReservationError:
                 raise errors.OpPrereqError("MAC address %s already in use"
                                            " in cluster" % mac,
                                            errors.ECODE_NOTUNIQUE)
             #  Build nic parameters
             link = nic.get(constants.INIC_LINK, None)
             if link == constants.VALUE_AUTO:
               link = cluster.nicparams[constants.PP_DEFAULT][constants.NIC_LINK]
             nicparams = {}
             if nic_mode_req:
               nicparams[constants.NIC_MODE] = nic_mode
             if link:
               nicparams[constants.NIC_LINK] = link
             check_params = cluster.SimpleFillNIC(nicparams)
             objects.NIC.CheckParameterSyntax(check_params)
             self.nics.append(objects.NIC(mac=mac, ip=nic_ip, nicparams=nicparams))
           # disk checks/pre-build
           default_vg = self.cfg.GetVGName()
           self.disks = []
           for disk in self.op.disks:
             mode = disk.get(constants.IDISK_MODE, constants.DISK_RDWR)
             if mode not in constants.DISK_ACCESS_SET:
               raise errors.OpPrereqError("Invalid disk access mode '%s'" %
                                          mode, errors.ECODE_INVAL)
             size = disk.get(constants.IDISK_SIZE, None)
             if size is None:
               raise errors.OpPrereqError("Missing disk size", errors.ECODE_INVAL)
             try:
               size = int(size)
             except (TypeError, ValueError):
               raise errors.OpPrereqError("Invalid disk size '%s'" % size,
                                          errors.ECODE_INVAL)
             data_vg = disk.get(constants.IDISK_VG, default_vg)
             new_disk = {
               constants.IDISK_SIZE: size,
               constants.IDISK_MODE: mode,
               constants.IDISK_VG: data_vg,
               constants.IDISK_METAVG: disk.get(constants.IDISK_METAVG, data_vg),
+              }
             if constants.IDISK_ADOPT in disk:
               new_disk[constants.IDISK_ADOPT] = disk[constants.IDISK_ADOPT]
             self.disks.append(new_disk)
           if self.op.mode == constants.INSTANCE_IMPORT:
             disk_images = []
             for idx in range(len(self.disks)):
               option = "disk%d_dump" % idx
               if export_info.has_option(constants.INISECT_INS, option):
                 # FIXME: are the old os-es, disk sizes, etc. useful?
                 export_name = export_info.get(constants.INISECT_INS, option)
                 image = utils.PathJoin(self.op.src_path, export_name)
                 disk_images.append(image)
               else:
                 disk_images.append(False)
             self.src_images = disk_images
             old_name = export_info.get(constants.INISECT_INS, "name")
             if self.op.instance_name == old_name:
               for idx, nic in enumerate(self.nics):
                 if nic.mac == constants.VALUE_AUTO:
                   nic_mac_ini = "nic%d_mac" % idx
                   nic.mac = export_info.get(constants.INISECT_INS, nic_mac_ini)
           # ENDIF: self.op.mode == constants.INSTANCE_IMPORT
           # ip ping checks (we use the same ip that was resolved in ExpandNames)
           if self.op.ip_check:
             if netutils.TcpPing(self.check_ip, constants.DEFAULT_NODED_PORT):
               raise errors.OpPrereqError("IP %s of instance %s already in use" %
                                          (self.check_ip, self.op.instance_name),
                                          errors.ECODE_NOTUNIQUE)
           #### mac address generation
           # By generating here the mac address both the allocator and the hooks get
           # the real final mac address rather than the 'auto' or 'generate' value.
           # There is a race condition between the generation and the instance object
           # creation, which means that we know the mac is valid now, but we're not
           # sure it will be when we actually add the instance. If things go bad
           # adding the instance will abort because of a duplicate mac, and the
           # creation job will fail.
           for nic in self.nics:
             if nic.mac in (constants.VALUE_AUTO, constants.VALUE_GENERATE):
               nic.mac = self.cfg.GenerateMAC(self.proc.GetECId())
           #### allocator run
           if self.op.iallocator is not None:
             self._RunAllocator()
           # Release all unneeded node locks
           _ReleaseLocks(self, locking.LEVEL_NODE,
                         keep=filter(None, [self.op.pnode, self.op.snode,
                                            self.op.src_node]))
           #### node related checks
           # check primary node
           self.pnode = pnode = self.cfg.GetNodeInfo(self.op.pnode)
           assert self.pnode is not None, \
             "Cannot retrieve locked node %s" % self.op.pnode
           if pnode.offline:
             raise errors.OpPrereqError("Cannot use offline primary node '%s'" %
                                        pnode.name, errors.ECODE_STATE)
           if pnode.drained:
             raise errors.OpPrereqError("Cannot use drained primary node '%s'" %
                                        pnode.name, errors.ECODE_STATE)
           if not pnode.vm_capable:
             raise errors.OpPrereqError("Cannot use non-vm_capable primary node"
                                        " '%s'" % pnode.name, errors.ECODE_STATE)
           self.secondaries = []
           # mirror node verification
           if self.op.disk_template in constants.DTS_INT_MIRROR:
             if self.op.snode == pnode.name:
               raise errors.OpPrereqError("The secondary node cannot be the"
                                          " primary node", errors.ECODE_INVAL)
             _CheckNodeOnline(self, self.op.snode)
             _CheckNodeNotDrained(self, self.op.snode)
             _CheckNodeVmCapable(self, self.op.snode)
             self.secondaries.append(self.op.snode)
             snode = self.cfg.GetNodeInfo(self.op.snode)
             if pnode.group != snode.group:
               self.LogWarning("The primary and secondary nodes are in two"
                               " different node groups; the disk parameters"
                               " from the first disk's node group will be"
                               " used")
           nodenames = [pnode.name] + self.secondaries
           # disk parameters (not customizable at instance or node level)
           # just use the primary node parameters, ignoring the secondary.
           self.diskparams = self.cfg.GetNodeGroup(pnode.group).diskparams
           if not self.adopt_disks:
             # Check lv size requirements, if not adopting
             req_sizes = _ComputeDiskSizePerVG(self.op.disk_template, self.disks)
             _CheckNodesFreeDiskPerVG(self, nodenames, req_sizes)
           elif self.op.disk_template == constants.DT_PLAIN: # Check the adoption data
             all_lvs = set(["%s/%s" % (disk[constants.IDISK_VG],
                                       disk[constants.IDISK_ADOPT])
                            for disk in self.disks])
             if len(all_lvs) != len(self.disks):
               raise errors.OpPrereqError("Duplicate volume names given for adoption",
                                          errors.ECODE_INVAL)
             for lv_name in all_lvs:
               try:
                 # FIXME: lv_name here is "vg/lv" need to ensure that other calls
                 # to ReserveLV uses the same syntax
                 self.cfg.ReserveLV(lv_name, self.proc.GetECId())
               except errors.ReservationError:
                 raise errors.OpPrereqError("LV named %s used by another instance" %
                                            lv_name, errors.ECODE_NOTUNIQUE)
             vg_names = self.rpc.call_vg_list([pnode.name])[pnode.name]
             vg_names.Raise("Cannot get VG information from node %s" % pnode.name)
             node_lvs = self.rpc.call_lv_list([pnode.name],
                                              vg_names.payload.keys())[pnode.name]
             node_lvs.Raise("Cannot get LV information from node %s" % pnode.name)
             node_lvs = node_lvs.payload
             delta = all_lvs.difference(node_lvs.keys())
             if delta:
               raise errors.OpPrereqError("Missing logical volume(s): %s" %
                                          utils.CommaJoin(delta),
                                          errors.ECODE_INVAL)
             online_lvs = [lv for lv in all_lvs if node_lvs[lv][2]]
             if online_lvs:
               raise errors.OpPrereqError("Online logical volumes found, cannot"
                                          " adopt: %s" % utils.CommaJoin(online_lvs),
                                          errors.ECODE_STATE)
             # update the size of disk based on what is found
             for dsk in self.disks:
               dsk[constants.IDISK_SIZE] = \
                 int(float(node_lvs["%s/%s" % (dsk[constants.IDISK_VG],
                                               dsk[constants.IDISK_ADOPT])][0]))
           elif self.op.disk_template == constants.DT_BLOCK:
             # Normalize and de-duplicate device paths
             all_disks = set([os.path.abspath(disk[constants.IDISK_ADOPT])
                              for disk in self.disks])
             if len(all_disks) != len(self.disks):
               raise errors.OpPrereqError("Duplicate disk names given for adoption",
                                          errors.ECODE_INVAL)
             baddisks = [d for d in all_disks
                         if not d.startswith(constants.ADOPTABLE_BLOCKDEV_ROOT)]
             if baddisks:
               raise errors.OpPrereqError("Device node(s) %s lie outside %s and"
                                          " cannot be adopted" %
                                          (", ".join(baddisks),
                                           constants.ADOPTABLE_BLOCKDEV_ROOT),
                                          errors.ECODE_INVAL)
             node_disks = self.rpc.call_bdev_sizes([pnode.name],
                                                   list(all_disks))[pnode.name]
             node_disks.Raise("Cannot get block device information from node %s" %
                              pnode.name)
             node_disks = node_disks.payload
             delta = all_disks.difference(node_disks.keys())
             if delta:
               raise errors.OpPrereqError("Missing block device(s): %s" %
                                          utils.CommaJoin(delta),
                                          errors.ECODE_INVAL)
             for dsk in self.disks:
               dsk[constants.IDISK_SIZE] = \
                 int(float(node_disks[dsk[constants.IDISK_ADOPT]]))
           _CheckHVParams(self, nodenames, self.op.hypervisor, self.op.hvparams)
           _CheckNodeHasOS(self, pnode.name, self.op.os_type, self.op.force_variant)
           # check OS parameters (remotely)
           _CheckOSParams(self, True, nodenames, self.op.os_type, self.os_full)
           _CheckNicsBridgesExist(self, self.nics, self.pnode.name)
           # memory check on primary node
           #TODO(dynmem): use MINMEM for checking
           if self.op.start:
             _CheckNodeFreeMemory(self, self.pnode.name,
                                  "creating instance %s" % self.op.instance_name,
                                  self.be_full[constants.BE_MAXMEM],
                                  self.op.hypervisor)
           self.dry_run_result = list(nodenames)
         def Exec(self, feedback_fn):
           """Create and add the instance to the cluster.
           """
           instance = self.op.instance_name
           pnode_name = self.pnode.name
           assert not (self.owned_locks(locking.LEVEL_NODE_RES) -
                       self.owned_locks(locking.LEVEL_NODE)), \
             "Node locks differ from node resource locks"
           ht_kind = self.op.hypervisor
           if ht_kind in constants.HTS_REQ_PORT:
             network_port = self.cfg.AllocatePort()
           else:
             network_port = None
           disks = _GenerateDiskTemplate(self,
                                         self.op.disk_template,
                                         instance, pnode_name,
                                         self.secondaries,
                                         self.disks,
                                         self.instance_file_storage_dir,
                                         self.op.file_driver,
 ,
                                         feedback_fn,
                                         self.diskparams)
           iobj = objects.Instance(name=instance, os=self.op.os_type,
                                   primary_node=pnode_name,
                                   nics=self.nics, disks=disks,
                                   disk_template=self.op.disk_template,
                                   admin_state=constants.ADMINST_DOWN,
                                   network_port=network_port,
                                   beparams=self.op.beparams,
                                   hvparams=self.op.hvparams,
                                   hypervisor=self.op.hypervisor,
                                   osparams=self.op.osparams,
+                                  )
           if self.op.tags:
             for tag in self.op.tags:
               iobj.AddTag(tag)
           if self.adopt_disks:
             if self.op.disk_template == constants.DT_PLAIN:
               # rename LVs to the newly-generated names; we need to construct
               # 'fake' LV disks with the old data, plus the new unique_id
               tmp_disks = [objects.Disk.FromDict(v.ToDict()) for v in disks]
               rename_to = []
               for t_dsk, a_dsk in zip(tmp_disks, self.disks):
                 rename_to.append(t_dsk.logical_id)
                 t_dsk.logical_id = (t_dsk.logical_id[0], a_dsk[constants.IDISK_ADOPT])
                 self.cfg.SetDiskID(t_dsk, pnode_name)
               result = self.rpc.call_blockdev_rename(pnode_name,
                                                      zip(tmp_disks, rename_to))
               result.Raise("Failed to rename adoped LVs")
           else:
             feedback_fn("* creating instance disks...")
             try:
               _CreateDisks(self, iobj)
             except errors.OpExecError:
               self.LogWarning("Device creation failed, reverting...")
               try:
                 _RemoveDisks(self, iobj)
               finally:
                 self.cfg.ReleaseDRBDMinors(instance)
                 raise
           feedback_fn("adding instance %s to cluster config" % instance)
           self.cfg.AddInstance(iobj, self.proc.GetECId())
           # Declare that we don't want to remove the instance lock anymore, as we've
           # added the instance to the config
           del self.remove_locks[locking.LEVEL_INSTANCE]
           if self.op.mode == constants.INSTANCE_IMPORT:
             # Release unused nodes
             _ReleaseLocks(self, locking.LEVEL_NODE, keep=[self.op.src_node])
           else:
             # Release all nodes
             _ReleaseLocks(self, locking.LEVEL_NODE)
           disk_abort = False
           if not self.adopt_disks and self.cfg.GetClusterInfo().prealloc_wipe_disks:
             feedback_fn("* wiping instance disks...")
             try:
               _WipeDisks(self, iobj)
             except errors.OpExecError, err:
               logging.exception("Wiping disks failed")
               self.LogWarning("Wiping instance disks failed (%s)", err)
               disk_abort = True
           if disk_abort:
             # Something is already wrong with the disks, don't do anything else
             pass
           elif self.op.wait_for_sync:
             disk_abort = not _WaitForSync(self, iobj)
           elif iobj.disk_template in constants.DTS_INT_MIRROR:
             # make sure the disks are not degraded (still sync-ing is ok)
             feedback_fn("* checking mirrors status")
             disk_abort = not _WaitForSync(self, iobj, oneshot=True)
           else:
             disk_abort = False
           if disk_abort:
             _RemoveDisks(self, iobj)
             self.cfg.RemoveInstance(iobj.name)
             # Make sure the instance lock gets removed
             self.remove_locks[locking.LEVEL_INSTANCE] = iobj.name
             raise errors.OpExecError("There are some degraded disks for"
                                      " this instance")
           # Release all node resource locks
           _ReleaseLocks(self, locking.LEVEL_NODE_RES)
           if iobj.disk_template != constants.DT_DISKLESS and not self.adopt_disks:
             if self.op.mode == constants.INSTANCE_CREATE:
               if not self.op.no_install:
                 pause_sync = (iobj.disk_template in constants.DTS_INT_MIRROR and
                               not self.op.wait_for_sync)
                 if pause_sync:
                   feedback_fn("* pausing disk sync to install instance OS")
                   result = self.rpc.call_blockdev_pause_resume_sync(pnode_name,
                                                                     iobj.disks, True)
                   for idx, success in enumerate(result.payload):
                     if not success:
                       logging.warn("pause-sync of instance %s for disk %d failed",
                                    instance, idx)
                 feedback_fn("* running the instance OS create scripts...")
                 # FIXME: pass debug option from opcode to backend
                 os_add_result = \
                   self.rpc.call_instance_os_add(pnode_name, (iobj, None), False,
                                                 self.op.debug_level)
                 if pause_sync:
                   feedback_fn("* resuming disk sync")
                   result = self.rpc.call_blockdev_pause_resume_sync(pnode_name,
                                                                     iobj.disks, False)
                   for idx, success in enumerate(result.payload):
                     if not success:
                       logging.warn("resume-sync of instance %s for disk %d failed",
                                    instance, idx)
                 os_add_result.Raise("Could not add os for instance %s"
                                     " on node %s" % (instance, pnode_name))
             elif self.op.mode == constants.INSTANCE_IMPORT:
               feedback_fn("* running the instance OS import scripts...")
               transfers = []
               for idx, image in enumerate(self.src_images):
                 if not image:
                   continue
                 # FIXME: pass debug option from opcode to backend
                 dt = masterd.instance.DiskTransfer("disk/%s" % idx,
                                                    constants.IEIO_FILE, (image, ),
                                                    constants.IEIO_SCRIPT,
                                                    (iobj.disks[idx], idx),
                                                    None)
                 transfers.append(dt)
               import_result = \
                 masterd.instance.TransferInstanceData(self, feedback_fn,
                                                       self.op.src_node, pnode_name,
                                                       self.pnode.secondary_ip,
                                                       iobj, transfers)
               if not compat.all(import_result):
                 self.LogWarning("Some disks for instance %s on node %s were not"
                                 " imported successfully" % (instance, pnode_name))
             elif self.op.mode == constants.INSTANCE_REMOTE_IMPORT:
               feedback_fn("* preparing remote import...")
               # The source cluster will stop the instance before attempting to make a
               # connection. In some cases stopping an instance can take a long time,
               # hence the shutdown timeout is added to the connection timeout.
               connect_timeout = (constants.RIE_CONNECT_TIMEOUT +
                                  self.op.source_shutdown_timeout)
               timeouts = masterd.instance.ImportExportTimeouts(connect_timeout)
               assert iobj.primary_node == self.pnode.name
               disk_results = \
                 masterd.instance.RemoteImport(self, feedback_fn, iobj, self.pnode,
                                               self.source_x509_ca,
                                               self._cds, timeouts)
               if not compat.all(disk_results):
                 # TODO: Should the instance still be started, even if some disks
                 # failed to import (valid for local imports, too)?
                 self.LogWarning("Some disks for instance %s on node %s were not"
                                 " imported successfully" % (instance, pnode_name))
               # Run rename script on newly imported instance
               assert iobj.name == instance
               feedback_fn("Running rename script for %s" % instance)
               result = self.rpc.call_instance_run_rename(pnode_name, iobj,
                                                          self.source_instance_name,
                                                          self.op.debug_level)
               if result.fail_msg:
                 self.LogWarning("Failed to run rename script for %s on node"
                                 " %s: %s" % (instance, pnode_name, result.fail_msg))
             else:
               # also checked in the prereq part
               raise errors.ProgrammerError("Unknown OS initialization mode '%s'"
                                            % self.op.mode)
           assert not self.owned_locks(locking.LEVEL_NODE_RES)
           if self.op.start:
             iobj.admin_state = constants.ADMINST_UP
             self.cfg.Update(iobj, feedback_fn)
             logging.info("Starting instance %s on node %s", instance, pnode_name)
             feedback_fn("* starting instance...")
             result = self.rpc.call_instance_start(pnode_name, (iobj, None, None),
                                                   False)
             result.Raise("Could not start instance")
           return list(iobj.all_nodes)
       class LUInstanceConsole(NoHooksLU):
         """Connect to an instance's console.
         This is somewhat special in that it returns the command line that
         you need to run on the master node in order to connect to the
         console.
         """
         REQ_BGL = False
         def ExpandNames(self):
           self.share_locks = _ShareAll()
           self._ExpandAndLockInstance()
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the instance is in the cluster.
           """
           self.instance = self.cfg.GetInstanceInfo(self.op.instance_name)
           assert self.instance is not None, \
             "Cannot retrieve locked instance %s" % self.op.instance_name
           _CheckNodeOnline(self, self.instance.primary_node)
         def Exec(self, feedback_fn):
           """Connect to the console of an instance
           """
           instance = self.instance
           node = instance.primary_node
           node_insts = self.rpc.call_instance_list([node],
                                                    [instance.hypervisor])[node]
           node_insts.Raise("Can't get node information from %s" % node)
           if instance.name not in node_insts.payload:
             if instance.admin_state == constants.ADMINST_UP:
               state = constants.INSTST_ERRORDOWN
             elif instance.admin_state == constants.ADMINST_DOWN:
               state = constants.INSTST_ADMINDOWN
             else:
               state = constants.INSTST_ADMINOFFLINE
             raise errors.OpExecError("Instance %s is not running (state %s)" %
                                      (instance.name, state))
           logging.debug("Connecting to console of %s on %s", instance.name, node)
           return _GetInstanceConsole(self.cfg.GetClusterInfo(), instance)
       def _GetInstanceConsole(cluster, instance):
         """Returns console information for an instance.
         @type cluster: L{objects.Cluster}
         @type instance: L{objects.Instance}
         @rtype: dict
         """
         hyper = hypervisor.GetHypervisor(instance.hypervisor)
         # beparams and hvparams are passed separately, to avoid editing the
         # instance and then saving the defaults in the instance itself.
         hvparams = cluster.FillHV(instance)
         beparams = cluster.FillBE(instance)
         console = hyper.GetInstanceConsole(instance, hvparams, beparams)
         assert console.instance == instance.name
         assert console.Validate()
         return console.ToDict()
       class LUInstanceReplaceDisks(LogicalUnit):
         """Replace the disks of an instance.
         """
         HPATH = "mirrors-replace"
         HTYPE = constants.HTYPE_INSTANCE
         REQ_BGL = False
         def CheckArguments(self):
           TLReplaceDisks.CheckArguments(self.op.mode, self.op.remote_node,
                                         self.op.iallocator)
         def ExpandNames(self):
           self._ExpandAndLockInstance()
           assert locking.LEVEL_NODE not in self.needed_locks
           assert locking.LEVEL_NODE_RES not in self.needed_locks
           assert locking.LEVEL_NODEGROUP not in self.needed_locks
           assert self.op.iallocator is None or self.op.remote_node is None, \
             "Conflicting options"
           if self.op.remote_node is not None:
             self.op.remote_node = _ExpandNodeName(self.cfg, self.op.remote_node)
             # Warning: do not remove the locking of the new secondary here
             # unless DRBD8.AddChildren is changed to work in parallel;
             # currently it doesn't since parallel invocations of
             # FindUnusedMinor will conflict
             self.needed_locks[locking.LEVEL_NODE] = [self.op.remote_node]
             self.recalculate_locks[locking.LEVEL_NODE] = constants.LOCKS_APPEND
           else:
             self.needed_locks[locking.LEVEL_NODE] = []
             self.recalculate_locks[locking.LEVEL_NODE] = constants.LOCKS_REPLACE
             if self.op.iallocator is not None:
               # iallocator will select a new node in the same group
               self.needed_locks[locking.LEVEL_NODEGROUP] = []
           self.needed_locks[locking.LEVEL_NODE_RES] = []
           self.replacer = TLReplaceDisks(self, self.op.instance_name, self.op.mode,
                                          self.op.iallocator, self.op.remote_node,
                                          self.op.disks, False, self.op.early_release)
           self.tasklets = [self.replacer]
         def DeclareLocks(self, level):
           if level == locking.LEVEL_NODEGROUP:
             assert self.op.remote_node is None
             assert self.op.iallocator is not None
             assert not self.needed_locks[locking.LEVEL_NODEGROUP]
             self.share_locks[locking.LEVEL_NODEGROUP] = 1
             # Lock all groups used by instance optimistically; this requires going
             # via the node before it's locked, requiring verification later on
             self.needed_locks[locking.LEVEL_NODEGROUP] = \
               self.cfg.GetInstanceNodeGroups(self.op.instance_name)
           elif level == locking.LEVEL_NODE:
             if self.op.iallocator is not None:
               assert self.op.remote_node is None
               assert not self.needed_locks[locking.LEVEL_NODE]
               # Lock member nodes of all locked groups
               self.needed_locks[locking.LEVEL_NODE] = [node_name
                 for group_uuid in self.owned_locks(locking.LEVEL_NODEGROUP)
                 for node_name in self.cfg.GetNodeGroup(group_uuid).members]
             else:
               self._LockInstancesNodes()
           elif level == locking.LEVEL_NODE_RES:
             # Reuse node locks
             self.needed_locks[locking.LEVEL_NODE_RES] = \
               self.needed_locks[locking.LEVEL_NODE]
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on the master, the primary and all the secondaries.
           """
           instance = self.replacer.instance
           env = {
             "MODE": self.op.mode,
             "NEW_SECONDARY": self.op.remote_node,
             "OLD_SECONDARY": instance.secondary_nodes[0],
+            }
           env.update(_BuildInstanceHookEnvByObject(self, instance))
           return env
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           instance = self.replacer.instance
           nl = [
             self.cfg.GetMasterNode(),
             instance.primary_node,
+            ]
           if self.op.remote_node is not None:
             nl.append(self.op.remote_node)
           return nl, nl
         def CheckPrereq(self):
           """Check prerequisites.
           """
           assert (self.glm.is_owned(locking.LEVEL_NODEGROUP) or
                   self.op.iallocator is None)
           # Verify if node group locks are still correct
           owned_groups = self.owned_locks(locking.LEVEL_NODEGROUP)
           if owned_groups:
             _CheckInstanceNodeGroups(self.cfg, self.op.instance_name, owned_groups)
           return LogicalUnit.CheckPrereq(self)
       class TLReplaceDisks(Tasklet):
         """Replaces disks for an instance.
         Note: Locking is not within the scope of this class.
         """
         def __init__(self, lu, instance_name, mode, iallocator_name, remote_node,
                      disks, delay_iallocator, early_release):
           """Initializes this class.
           """
           Tasklet.__init__(self, lu)
           # Parameters
           self.instance_name = instance_name
           self.mode = mode
           self.iallocator_name = iallocator_name
           self.remote_node = remote_node
           self.disks = disks
           self.delay_iallocator = delay_iallocator
           self.early_release = early_release
           # Runtime data
           self.instance = None
           self.new_node = None
           self.target_node = None
           self.other_node = None
           self.remote_node_info = None
           self.node_secondary_ip = None
         @staticmethod
         def CheckArguments(mode, remote_node, iallocator):
           """Helper function for users of this class.
           """
           # check for valid parameter combination
           if mode == constants.REPLACE_DISK_CHG:
             if remote_node is None and iallocator is None:
               raise errors.OpPrereqError("When changing the secondary either an"
                                          " iallocator script must be used or the"
                                          " new node given", errors.ECODE_INVAL)
             if remote_node is not None and iallocator is not None:
               raise errors.OpPrereqError("Give either the iallocator or the new"
                                          " secondary, not both", errors.ECODE_INVAL)
           elif remote_node is not None or iallocator is not None:
             # Not replacing the secondary
             raise errors.OpPrereqError("The iallocator and new node options can"
                                        " only be used when changing the"
                                        " secondary node", errors.ECODE_INVAL)
         @staticmethod
         def _RunAllocator(lu, iallocator_name, instance_name, relocate_from):
           """Compute a new secondary node using an IAllocator.
           """
           ial = IAllocator(lu.cfg, lu.rpc,
                            mode=constants.IALLOCATOR_MODE_RELOC,
                            name=instance_name,
                            relocate_from=list(relocate_from))
           ial.Run(iallocator_name)
           if not ial.success:
             raise errors.OpPrereqError("Can't compute nodes using iallocator '%s':"
                                        " %s" % (iallocator_name, ial.info),
                                        errors.ECODE_NORES)
           if len(ial.result) != ial.required_nodes:
             raise errors.OpPrereqError("iallocator '%s' returned invalid number"
                                        " of nodes (%s), required %s" %
                                        (iallocator_name,
                                         len(ial.result), ial.required_nodes),
                                        errors.ECODE_FAULT)
           remote_node_name = ial.result[0]
           lu.LogInfo("Selected new secondary for instance '%s': %s",
                      instance_name, remote_node_name)
           return remote_node_name
         def _FindFaultyDisks(self, node_name):
           """Wrapper for L{_FindFaultyInstanceDisks}.
           """
           return _FindFaultyInstanceDisks(self.cfg, self.rpc, self.instance,
                                           node_name, True)
         def _CheckDisksActivated(self, instance):
           """Checks if the instance disks are activated.
           @param instance: The instance to check disks
           @return: True if they are activated, False otherwise
           """
           nodes = instance.all_nodes
           for idx, dev in enumerate(instance.disks):
             for node in nodes:
               self.lu.LogInfo("Checking disk/%d on %s", idx, node)
               self.cfg.SetDiskID(dev, node)
               result = self.rpc.call_blockdev_find(node, dev)
               if result.offline:
                 continue
               elif result.fail_msg or not result.payload:
                 return False
           return True
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the instance is in the cluster.
           """
           self.instance = instance = self.cfg.GetInstanceInfo(self.instance_name)
           assert instance is not None, \
             "Cannot retrieve locked instance %s" % self.instance_name
           if instance.disk_template != constants.DT_DRBD8:
             raise errors.OpPrereqError("Can only run replace disks for DRBD8-based"
                                        " instances", errors.ECODE_INVAL)
           if len(instance.secondary_nodes) != 1:
             raise errors.OpPrereqError("The instance has a strange layout,"
                                        " expected one secondary but found %d" %
                                        len(instance.secondary_nodes),
                                        errors.ECODE_FAULT)
           if not self.delay_iallocator:
             self._CheckPrereq2()
         def _CheckPrereq2(self):
           """Check prerequisites, second part.
           This function should always be part of CheckPrereq. It was separated and is
           now called from Exec because during node evacuation iallocator was only
           called with an unmodified cluster model, not taking planned changes into
           account.
           """
           instance = self.instance
           secondary_node = instance.secondary_nodes[0]
           if self.iallocator_name is None:
             remote_node = self.remote_node
           else:
             remote_node = self._RunAllocator(self.lu, self.iallocator_name,
                                              instance.name, instance.secondary_nodes)
           if remote_node is None:
             self.remote_node_info = None
           else:
             assert remote_node in self.lu.owned_locks(locking.LEVEL_NODE), \
                    "Remote node '%s' is not locked" % remote_node
             self.remote_node_info = self.cfg.GetNodeInfo(remote_node)
             assert self.remote_node_info is not None, \
               "Cannot retrieve locked node %s" % remote_node
           if remote_node == self.instance.primary_node:
             raise errors.OpPrereqError("The specified node is the primary node of"
                                        " the instance", errors.ECODE_INVAL)
           if remote_node == secondary_node:
             raise errors.OpPrereqError("The specified node is already the"
                                        " secondary node of the instance",
                                        errors.ECODE_INVAL)
           if self.disks and self.mode in (constants.REPLACE_DISK_AUTO,
                                           constants.REPLACE_DISK_CHG):
             raise errors.OpPrereqError("Cannot specify disks to be replaced",
                                        errors.ECODE_INVAL)
           if self.mode == constants.REPLACE_DISK_AUTO:
             if not self._CheckDisksActivated(instance):
               raise errors.OpPrereqError("Please run activate-disks on instance %s"
                                          " first" % self.instance_name,
                                          errors.ECODE_STATE)
             faulty_primary = self._FindFaultyDisks(instance.primary_node)
             faulty_secondary = self._FindFaultyDisks(secondary_node)
             if faulty_primary and faulty_secondary:
               raise errors.OpPrereqError("Instance %s has faulty disks on more than"
                                          " one node and can not be repaired"
                                          " automatically" % self.instance_name,
                                          errors.ECODE_STATE)
             if faulty_primary:
               self.disks = faulty_primary
               self.target_node = instance.primary_node
               self.other_node = secondary_node
               check_nodes = [self.target_node, self.other_node]
             elif faulty_secondary:
               self.disks = faulty_secondary
               self.target_node = secondary_node
               self.other_node = instance.primary_node
               check_nodes = [self.target_node, self.other_node]
             else:
               self.disks = []
               check_nodes = []
           else:
             # Non-automatic modes
             if self.mode == constants.REPLACE_DISK_PRI:
               self.target_node = instance.primary_node
               self.other_node = secondary_node
               check_nodes = [self.target_node, self.other_node]
             elif self.mode == constants.REPLACE_DISK_SEC:
               self.target_node = secondary_node
               self.other_node = instance.primary_node
               check_nodes = [self.target_node, self.other_node]
             elif self.mode == constants.REPLACE_DISK_CHG:
               self.new_node = remote_node
               self.other_node = instance.primary_node
               self.target_node = secondary_node
               check_nodes = [self.new_node, self.other_node]
               _CheckNodeNotDrained(self.lu, remote_node)
               _CheckNodeVmCapable(self.lu, remote_node)
               old_node_info = self.cfg.GetNodeInfo(secondary_node)
               assert old_node_info is not None
               if old_node_info.offline and not self.early_release:
                 # doesn't make sense to delay the release
                 self.early_release = True
                 self.lu.LogInfo("Old secondary %s is offline, automatically enabling"
                                 " early-release mode", secondary_node)
             else:
               raise errors.ProgrammerError("Unhandled disk replace mode (%s)" %
                                            self.mode)
             # If not specified all disks should be replaced
             if not self.disks:
               self.disks = range(len(self.instance.disks))
           # TODO: compute disk parameters
           primary_node_info = self.cfg.GetNodeInfo(instance.primary_node)
           secondary_node_info = self.cfg.GetNodeInfo(secondary_node)
           if primary_node_info.group != secondary_node_info.group:
             self.lu.LogInfo("The instance primary and secondary nodes are in two"
                             " different node groups; the disk parameters of the"
                             " primary node's group will be applied.")
           self.diskparams = self.cfg.GetNodeGroup(primary_node_info.group).diskparams
           for node in check_nodes:
             _CheckNodeOnline(self.lu, node)
           touched_nodes = frozenset(node_name for node_name in [self.new_node,
                                                                 self.other_node,
                                                                 self.target_node]
                                     if node_name is not None)
           # Release unneeded node and node resource locks
           _ReleaseLocks(self.lu, locking.LEVEL_NODE, keep=touched_nodes)
           _ReleaseLocks(self.lu, locking.LEVEL_NODE_RES, keep=touched_nodes)
           # Release any owned node group
           if self.lu.glm.is_owned(locking.LEVEL_NODEGROUP):
             _ReleaseLocks(self.lu, locking.LEVEL_NODEGROUP)
           # Check whether disks are valid
           for disk_idx in self.disks:
             instance.FindDisk(disk_idx)
           # Get secondary node IP addresses
           self.node_secondary_ip = dict((name, node.secondary_ip) for (name, node)
                                         in self.cfg.GetMultiNodeInfo(touched_nodes))
         def Exec(self, feedback_fn):
           """Execute disk replacement.
           This dispatches the disk replacement to the appropriate handler.
           """
           if self.delay_iallocator:
             self._CheckPrereq2()
           if __debug__:
             # Verify owned locks before starting operation
             owned_nodes = self.lu.owned_locks(locking.LEVEL_NODE)
             assert set(owned_nodes) == set(self.node_secondary_ip), \
                 ("Incorrect node locks, owning %s, expected %s" %
                  (owned_nodes, self.node_secondary_ip.keys()))
             assert (self.lu.owned_locks(locking.LEVEL_NODE) ==
                     self.lu.owned_locks(locking.LEVEL_NODE_RES))
             owned_instances = self.lu.owned_locks(locking.LEVEL_INSTANCE)
             assert list(owned_instances) == [self.instance_name], \
                 "Instance '%s' not locked" % self.instance_name
             assert not self.lu.glm.is_owned(locking.LEVEL_NODEGROUP), \
                 "Should not own any node group lock at this point"
           if not self.disks:
             feedback_fn("No disks need replacement")
             return
           feedback_fn("Replacing disk(s) %s for %s" %
                       (utils.CommaJoin(self.disks), self.instance.name))
           activate_disks = (self.instance.admin_state != constants.ADMINST_UP)
           # Activate the instance disks if we're replacing them on a down instance
           if activate_disks:
             _StartInstanceDisks(self.lu, self.instance, True)
           try:
             # Should we replace the secondary node?
             if self.new_node is not None:
               fn = self._ExecDrbd8Secondary
             else:
               fn = self._ExecDrbd8DiskOnly
             result = fn(feedback_fn)
           finally:
             # Deactivate the instance disks if we're replacing them on a
             # down instance
             if activate_disks:
               _SafeShutdownInstanceDisks(self.lu, self.instance)
           assert not self.lu.owned_locks(locking.LEVEL_NODE)
           if __debug__:
             # Verify owned locks
             owned_nodes = self.lu.owned_locks(locking.LEVEL_NODE_RES)
             nodes = frozenset(self.node_secondary_ip)
             assert ((self.early_release and not owned_nodes) or
                     (not self.early_release and not (set(owned_nodes) - nodes))), \
               ("Not owning the correct locks, early_release=%s, owned=%r,"
                " nodes=%r" % (self.early_release, owned_nodes, nodes))
           return result
         def _CheckVolumeGroup(self, nodes):
           self.lu.LogInfo("Checking volume groups")
           vgname = self.cfg.GetVGName()
           # Make sure volume group exists on all involved nodes
           results = self.rpc.call_vg_list(nodes)
           if not results:
             raise errors.OpExecError("Can't list volume groups on the nodes")
           for node in nodes:
             res = results[node]
             res.Raise("Error checking node %s" % node)
             if vgname not in res.payload:
               raise errors.OpExecError("Volume group '%s' not found on node %s" %
                                        (vgname, node))
         def _CheckDisksExistence(self, nodes):
           # Check disk existence
           for idx, dev in enumerate(self.instance.disks):
             if idx not in self.disks:
               continue
             for node in nodes:
               self.lu.LogInfo("Checking disk/%d on %s" % (idx, node))
               self.cfg.SetDiskID(dev, node)
               result = self.rpc.call_blockdev_find(node, dev)
               msg = result.fail_msg
               if msg or not result.payload:
                 if not msg:
                   msg = "disk not found"
                 raise errors.OpExecError("Can't find disk/%d on node %s: %s" %
                                          (idx, node, msg))
         def _CheckDisksConsistency(self, node_name, on_primary, ldisk):
           for idx, dev in enumerate(self.instance.disks):
             if idx not in self.disks:
               continue
             self.lu.LogInfo("Checking disk/%d consistency on node %s" %
                             (idx, node_name))
             if not _CheckDiskConsistency(self.lu, dev, node_name, on_primary,
                                          ldisk=ldisk):
               raise errors.OpExecError("Node %s has degraded storage, unsafe to"
                                        " replace disks for instance %s" %
                                        (node_name, self.instance.name))
         def _CreateNewStorage(self, node_name):
           """Create new storage on the primary or secondary node.
           This is only used for same-node replaces, not for changing the
           secondary node, hence we don't want to modify the existing disk.
           """
           iv_names = {}
           for idx, dev in enumerate(self.instance.disks):
             if idx not in self.disks:
               continue
             self.lu.LogInfo("Adding storage on %s for disk/%d" % (node_name, idx))
             self.cfg.SetDiskID(dev, node_name)
             lv_names = [".disk%d_%s" % (idx, suffix) for suffix in ["data", "meta"]]
             names = _GenerateUniqueNames(self.lu, lv_names)
             _, data_p, meta_p = _ComputeLDParams(constants.DT_DRBD8, self.diskparams)
             vg_data = dev.children[0].logical_id[0]
             lv_data = objects.Disk(dev_type=constants.LD_LV, size=dev.size,
                                    logical_id=(vg_data, names[0]), params=data_p)
             vg_meta = dev.children[1].logical_id[0]
             lv_meta = objects.Disk(dev_type=constants.LD_LV, size=DRBD_META_SIZE,
                                    logical_id=(vg_meta, names[1]), params=meta_p)
             new_lvs = [lv_data, lv_meta]
             old_lvs = [child.Copy() for child in dev.children]
             iv_names[dev.iv_name] = (dev, old_lvs, new_lvs)
             # we pass force_create=True to force the LVM creation
             for new_lv in new_lvs:
               _CreateBlockDev(self.lu, node_name, self.instance, new_lv, True,
                               _GetInstanceInfoText(self.instance), False)
           return iv_names
         def _CheckDevices(self, node_name, iv_names):
           for name, (dev, _, _) in iv_names.iteritems():
             self.cfg.SetDiskID(dev, node_name)
             result = self.rpc.call_blockdev_find(node_name, dev)
             msg = result.fail_msg
             if msg or not result.payload:
               if not msg:
                 msg = "disk not found"
               raise errors.OpExecError("Can't find DRBD device %s: %s" %
                                        (name, msg))
             if result.payload.is_degraded:
               raise errors.OpExecError("DRBD device %s is degraded!" % name)
         def _RemoveOldStorage(self, node_name, iv_names):
           for name, (_, old_lvs, _) in iv_names.iteritems():
             self.lu.LogInfo("Remove logical volumes for %s" % name)
             for lv in old_lvs:
               self.cfg.SetDiskID(lv, node_name)
               msg = self.rpc.call_blockdev_remove(node_name, lv).fail_msg
               if msg:
                 self.lu.LogWarning("Can't remove old LV: %s" % msg,
                                    hint="remove unused LVs manually")
         def _ExecDrbd8DiskOnly(self, feedback_fn): # pylint: disable=W0613
           """Replace a disk on the primary or secondary for DRBD 8.
           The algorithm for replace is quite complicated:
 . for each disk to be replaced:
 . create new LVs on the target node with unique names
 . detach old LVs from the drbd device
 . rename old LVs to name_replaced.<time_t>
 . rename new LVs to old LVs
 . attach the new LVs (with the old names now) to the drbd device
 . wait for sync across all devices
 . for each modified disk:
 . remove old LVs (which have the name name_replaces.<time_t>)
           Failures are not very well handled.
           """
           steps_total = 6
           # Step: check device activation
           self.lu.LogStep(1, steps_total, "Check device existence")
           self._CheckDisksExistence([self.other_node, self.target_node])
           self._CheckVolumeGroup([self.target_node, self.other_node])
           # Step: check other node consistency
           self.lu.LogStep(2, steps_total, "Check peer consistency")
           self._CheckDisksConsistency(self.other_node,
                                       self.other_node == self.instance.primary_node,
                                       False)
           # Step: create new storage
           self.lu.LogStep(3, steps_total, "Allocate new storage")
           iv_names = self._CreateNewStorage(self.target_node)
           # Step: for each lv, detach+rename*2+attach
           self.lu.LogStep(4, steps_total, "Changing drbd configuration")
           for dev, old_lvs, new_lvs in iv_names.itervalues():
             self.lu.LogInfo("Detaching %s drbd from local storage" % dev.iv_name)
             result = self.rpc.call_blockdev_removechildren(self.target_node, dev,
                                                            old_lvs)
             result.Raise("Can't detach drbd from local storage on node"
                          " %s for device %s" % (self.target_node, dev.iv_name))
             #dev.children = []
             #cfg.Update(instance)
             # ok, we created the new LVs, so now we know we have the needed
             # storage; as such, we proceed on the target node to rename
             # old_lv to _old, and new_lv to old_lv; note that we rename LVs
             # using the assumption that logical_id == physical_id (which in
             # turn is the unique_id on that node)
             # FIXME(iustin): use a better name for the replaced LVs
             temp_suffix = int(time.time())
             ren_fn = lambda d, suff: (d.physical_id[0],
                                       d.physical_id[1] + "_replaced-%s" % suff)
             # Build the rename list based on what LVs exist on the node
             rename_old_to_new = []
             for to_ren in old_lvs:
               result = self.rpc.call_blockdev_find(self.target_node, to_ren)
               if not result.fail_msg and result.payload:
                 # device exists
                 rename_old_to_new.append((to_ren, ren_fn(to_ren, temp_suffix)))
             self.lu.LogInfo("Renaming the old LVs on the target node")
             result = self.rpc.call_blockdev_rename(self.target_node,
                                                    rename_old_to_new)
             result.Raise("Can't rename old LVs on node %s" % self.target_node)
             # Now we rename the new LVs to the old LVs
             self.lu.LogInfo("Renaming the new LVs on the target node")
             rename_new_to_old = [(new, old.physical_id)
                                  for old, new in zip(old_lvs, new_lvs)]
             result = self.rpc.call_blockdev_rename(self.target_node,
                                                    rename_new_to_old)
             result.Raise("Can't rename new LVs on node %s" % self.target_node)
             # Intermediate steps of in memory modifications
             for old, new in zip(old_lvs, new_lvs):
               new.logical_id = old.logical_id
               self.cfg.SetDiskID(new, self.target_node)
             # We need to modify old_lvs so that removal later removes the
             # right LVs, not the newly added ones; note that old_lvs is a
             # copy here
             for disk in old_lvs:
               disk.logical_id = ren_fn(disk, temp_suffix)
               self.cfg.SetDiskID(disk, self.target_node)
             # Now that the new lvs have the old name, we can add them to the device
             self.lu.LogInfo("Adding new mirror component on %s" % self.target_node)
             result = self.rpc.call_blockdev_addchildren(self.target_node, dev,
                                                         new_lvs)
             msg = result.fail_msg
             if msg:
               for new_lv in new_lvs:
                 msg2 = self.rpc.call_blockdev_remove(self.target_node,
                                                      new_lv).fail_msg
                 if msg2:
                   self.lu.LogWarning("Can't rollback device %s: %s", dev, msg2,
                                      hint=("cleanup manually the unused logical"
                                            "volumes"))
               raise errors.OpExecError("Can't add local storage to drbd: %s" % msg)
           cstep = itertools.count(5)
           if self.early_release:
             self.lu.LogStep(cstep.next(), steps_total, "Removing old storage")
             self._RemoveOldStorage(self.target_node, iv_names)
             # TODO: Check if releasing locks early still makes sense
             _ReleaseLocks(self.lu, locking.LEVEL_NODE_RES)
           else:
             # Release all resource locks except those used by the instance
             _ReleaseLocks(self.lu, locking.LEVEL_NODE_RES,
                           keep=self.node_secondary_ip.keys())
           # Release all node locks while waiting for sync
           _ReleaseLocks(self.lu, locking.LEVEL_NODE)
           # TODO: Can the instance lock be downgraded here? Take the optional disk
           # shutdown in the caller into consideration.
           # Wait for sync
           # This can fail as the old devices are degraded and _WaitForSync
           # does a combined result over all disks, so we don't check its return value
           self.lu.LogStep(cstep.next(), steps_total, "Sync devices")
           _WaitForSync(self.lu, self.instance)
           # Check all devices manually
           self._CheckDevices(self.instance.primary_node, iv_names)
           # Step: remove old storage
           if not self.early_release:
             self.lu.LogStep(cstep.next(), steps_total, "Removing old storage")
             self._RemoveOldStorage(self.target_node, iv_names)
         def _ExecDrbd8Secondary(self, feedback_fn):
           """Replace the secondary node for DRBD 8.
           The algorithm for replace is quite complicated:
             - for all disks of the instance:
               - create new LVs on the new node with same names
               - shutdown the drbd device on the old secondary
               - disconnect the drbd network on the primary
               - create the drbd device on the new secondary
               - network attach the drbd on the primary, using an artifice:
                 the drbd code for Attach() will connect to the network if it
                 finds a device which is connected to the good local disks but
                 not network enabled
             - wait for sync across all devices
             - remove all disks from the old secondary
           Failures are not very well handled.
           """
           steps_total = 6
           pnode = self.instance.primary_node
           # Step: check device activation
           self.lu.LogStep(1, steps_total, "Check device existence")
           self._CheckDisksExistence([self.instance.primary_node])
           self._CheckVolumeGroup([self.instance.primary_node])
           # Step: check other node consistency
           self.lu.LogStep(2, steps_total, "Check peer consistency")
           self._CheckDisksConsistency(self.instance.primary_node, True, True)
           # Step: create new storage
           self.lu.LogStep(3, steps_total, "Allocate new storage")
           for idx, dev in enumerate(self.instance.disks):
             self.lu.LogInfo("Adding new local storage on %s for disk/%d" %
                             (self.new_node, idx))
             # we pass force_create=True to force LVM creation
             for new_lv in dev.children:
               _CreateBlockDev(self.lu, self.new_node, self.instance, new_lv, True,
                               _GetInstanceInfoText(self.instance), False)
           # Step 4: dbrd minors and drbd setups changes
           # after this, we must manually remove the drbd minors on both the
           # error and the success paths
           self.lu.LogStep(4, steps_total, "Changing drbd configuration")
           minors = self.cfg.AllocateDRBDMinor([self.new_node
                                                for dev in self.instance.disks],
                                               self.instance.name)
           logging.debug("Allocated minors %r", minors)
           iv_names = {}
           for idx, (dev, new_minor) in enumerate(zip(self.instance.disks, minors)):
             self.lu.LogInfo("activating a new drbd on %s for disk/%d" %
                             (self.new_node, idx))
             # create new devices on new_node; note that we create two IDs:
             # one without port, so the drbd will be activated without
             # networking information on the new node at this stage, and one
             # with network, for the latter activation in step 4
             (o_node1, o_node2, o_port, o_minor1, o_minor2, o_secret) = dev.logical_id
             if self.instance.primary_node == o_node1:
               p_minor = o_minor1
             else:
               assert self.instance.primary_node == o_node2, "Three-node instance?"
               p_minor = o_minor2
             new_alone_id = (self.instance.primary_node, self.new_node, None,
                             p_minor, new_minor, o_secret)
             new_net_id = (self.instance.primary_node, self.new_node, o_port,
                           p_minor, new_minor, o_secret)
             iv_names[idx] = (dev, dev.children, new_net_id)
             logging.debug("Allocated new_minor: %s, new_logical_id: %s", new_minor,
                           new_net_id)
             drbd_params, _, _ = _ComputeLDParams(constants.DT_DRBD8, self.diskparams)
             new_drbd = objects.Disk(dev_type=constants.LD_DRBD8,
                                     logical_id=new_alone_id,
                                     children=dev.children,
                                     size=dev.size,
                                     params=drbd_params)
             try:
               _CreateSingleBlockDev(self.lu, self.new_node, self.instance, new_drbd,
                                     _GetInstanceInfoText(self.instance), False)
             except errors.GenericError:
               self.cfg.ReleaseDRBDMinors(self.instance.name)
               raise
           # We have new devices, shutdown the drbd on the old secondary
           for idx, dev in enumerate(self.instance.disks):
             self.lu.LogInfo("Shutting down drbd for disk/%d on old node" % idx)
             self.cfg.SetDiskID(dev, self.target_node)
             msg = self.rpc.call_blockdev_shutdown(self.target_node, dev).fail_msg
             if msg:
               self.lu.LogWarning("Failed to shutdown drbd for disk/%d on old"
                                  "node: %s" % (idx, msg),
                                  hint=("Please cleanup this device manually as"
                                        " soon as possible"))
           self.lu.LogInfo("Detaching primary drbds from the network (=> standalone)")
           result = self.rpc.call_drbd_disconnect_net([pnode], self.node_secondary_ip,
                                                      self.instance.disks)[pnode]
           msg = result.fail_msg
           if msg:
             # detaches didn't succeed (unlikely)
             self.cfg.ReleaseDRBDMinors(self.instance.name)
             raise errors.OpExecError("Can't detach the disks from the network on"
                                      " old node: %s" % (msg,))
           # if we managed to detach at least one, we update all the disks of
           # the instance to point to the new secondary
           self.lu.LogInfo("Updating instance configuration")
           for dev, _, new_logical_id in iv_names.itervalues():
             dev.logical_id = new_logical_id
             self.cfg.SetDiskID(dev, self.instance.primary_node)
           self.cfg.Update(self.instance, feedback_fn)
           # Release all node locks (the configuration has been updated)
           _ReleaseLocks(self.lu, locking.LEVEL_NODE)
           # and now perform the drbd attach
           self.lu.LogInfo("Attaching primary drbds to new secondary"
                           " (standalone => connected)")
           result = self.rpc.call_drbd_attach_net([self.instance.primary_node,
                                                   self.new_node],
                                                  self.node_secondary_ip,
                                                  self.instance.disks,
                                                  self.instance.name,
                                                  False)
           for to_node, to_result in result.items():
             msg = to_result.fail_msg
             if msg:
               self.lu.LogWarning("Can't attach drbd disks on node %s: %s",
                                  to_node, msg,
                                  hint=("please do a gnt-instance info to see the"
                                        " status of disks"))
           cstep = itertools.count(5)
           if self.early_release:
             self.lu.LogStep(cstep.next(), steps_total, "Removing old storage")
             self._RemoveOldStorage(self.target_node, iv_names)
             # TODO: Check if releasing locks early still makes sense
             _ReleaseLocks(self.lu, locking.LEVEL_NODE_RES)
           else:
             # Release all resource locks except those used by the instance
             _ReleaseLocks(self.lu, locking.LEVEL_NODE_RES,
                           keep=self.node_secondary_ip.keys())
           # TODO: Can the instance lock be downgraded here? Take the optional disk
           # shutdown in the caller into consideration.
           # Wait for sync
           # This can fail as the old devices are degraded and _WaitForSync
           # does a combined result over all disks, so we don't check its return value
           self.lu.LogStep(cstep.next(), steps_total, "Sync devices")
           _WaitForSync(self.lu, self.instance)
           # Check all devices manually
           self._CheckDevices(self.instance.primary_node, iv_names)
           # Step: remove old storage
           if not self.early_release:
             self.lu.LogStep(cstep.next(), steps_total, "Removing old storage")
             self._RemoveOldStorage(self.target_node, iv_names)
       class LURepairNodeStorage(NoHooksLU):
         """Repairs the volume group on a node.
         """
         REQ_BGL = False
         def CheckArguments(self):
           self.op.node_name = _ExpandNodeName(self.cfg, self.op.node_name)
           storage_type = self.op.storage_type
           if (constants.SO_FIX_CONSISTENCY not in
               constants.VALID_STORAGE_OPERATIONS.get(storage_type, [])):
             raise errors.OpPrereqError("Storage units of type '%s' can not be"
                                        " repaired" % storage_type,
                                        errors.ECODE_INVAL)
         def ExpandNames(self):
           self.needed_locks = {
             locking.LEVEL_NODE: [self.op.node_name],
+            }
         def _CheckFaultyDisks(self, instance, node_name):
           """Ensure faulty disks abort the opcode or at least warn."""
           try:
             if _FindFaultyInstanceDisks(self.cfg, self.rpc, instance,
                                         node_name, True):
               raise errors.OpPrereqError("Instance '%s' has faulty disks on"
                                          " node '%s'" % (instance.name, node_name),
                                          errors.ECODE_STATE)
           except errors.OpPrereqError, err:
             if self.op.ignore_consistency:
               self.proc.LogWarning(str(err.args[0]))
             else:
               raise
         def CheckPrereq(self):
           """Check prerequisites.
           """
           # Check whether any instance on this node has faulty disks
           for inst in _GetNodeInstances(self.cfg, self.op.node_name):
             if inst.admin_state != constants.ADMINST_UP:
               continue
             check_nodes = set(inst.all_nodes)
             check_nodes.discard(self.op.node_name)
             for inst_node_name in check_nodes:
               self._CheckFaultyDisks(inst, inst_node_name)
         def Exec(self, feedback_fn):
           feedback_fn("Repairing storage unit '%s' on %s ..." %
                       (self.op.name, self.op.node_name))
           st_args = _GetStorageTypeArgs(self.cfg, self.op.storage_type)
           result = self.rpc.call_storage_execute(self.op.node_name,
                                                  self.op.storage_type, st_args,
                                                  self.op.name,
                                                  constants.SO_FIX_CONSISTENCY)
           result.Raise("Failed to repair storage unit '%s' on %s" %
                        (self.op.name, self.op.node_name))
       class LUNodeEvacuate(NoHooksLU):
         """Evacuates instances off a list of nodes.
         """
         REQ_BGL = False
         _MODE2IALLOCATOR = {
           constants.NODE_EVAC_PRI: constants.IALLOCATOR_NEVAC_PRI,
           constants.NODE_EVAC_SEC: constants.IALLOCATOR_NEVAC_SEC,
           constants.NODE_EVAC_ALL: constants.IALLOCATOR_NEVAC_ALL,
+          }
         assert frozenset(_MODE2IALLOCATOR.keys()) == constants.NODE_EVAC_MODES
         assert (frozenset(_MODE2IALLOCATOR.values()) ==
                 constants.IALLOCATOR_NEVAC_MODES)
         def CheckArguments(self):
           _CheckIAllocatorOrNode(self, "iallocator", "remote_node")
         def ExpandNames(self):
           self.op.node_name = _ExpandNodeName(self.cfg, self.op.node_name)
           if self.op.remote_node is not None:
             self.op.remote_node = _ExpandNodeName(self.cfg, self.op.remote_node)
             assert self.op.remote_node
             if self.op.remote_node == self.op.node_name:
               raise errors.OpPrereqError("Can not use evacuated node as a new"
                                          " secondary node", errors.ECODE_INVAL)
             if self.op.mode != constants.NODE_EVAC_SEC:
               raise errors.OpPrereqError("Without the use of an iallocator only"
                                          " secondary instances can be evacuated",
                                          errors.ECODE_INVAL)
           # Declare locks
           self.share_locks = _ShareAll()
           self.needed_locks = {
             locking.LEVEL_INSTANCE: [],
             locking.LEVEL_NODEGROUP: [],
             locking.LEVEL_NODE: [],
+            }
           # Determine nodes (via group) optimistically, needs verification once locks
           # have been acquired
           self.lock_nodes = self._DetermineNodes()
         def _DetermineNodes(self):
           """Gets the list of nodes to operate on.
           """
           if self.op.remote_node is None:
             # Iallocator will choose any node(s) in the same group
             group_nodes = self.cfg.GetNodeGroupMembersByNodes([self.op.node_name])
           else:
             group_nodes = frozenset([self.op.remote_node])
           # Determine nodes to be locked
           return set([self.op.node_name]) | group_nodes
         def _DetermineInstances(self):
           """Builds list of instances to operate on.
           """
           assert self.op.mode in constants.NODE_EVAC_MODES
           if self.op.mode == constants.NODE_EVAC_PRI:
             # Primary instances only
             inst_fn = _GetNodePrimaryInstances
             assert self.op.remote_node is None, \
               "Evacuating primary instances requires iallocator"
           elif self.op.mode == constants.NODE_EVAC_SEC:
             # Secondary instances only
             inst_fn = _GetNodeSecondaryInstances
           else:
             # All instances
             assert self.op.mode == constants.NODE_EVAC_ALL
             inst_fn = _GetNodeInstances
             # TODO: In 2.6, change the iallocator interface to take an evacuation mode
             # per instance
             raise errors.OpPrereqError("Due to an issue with the iallocator"
                                        " interface it is not possible to evacuate"
                                        " all instances at once; specify explicitly"
                                        " whether to evacuate primary or secondary"
                                        " instances",
                                        errors.ECODE_INVAL)
           return inst_fn(self.cfg, self.op.node_name)
         def DeclareLocks(self, level):
           if level == locking.LEVEL_INSTANCE:
             # Lock instances optimistically, needs verification once node and group
             # locks have been acquired
             self.needed_locks[locking.LEVEL_INSTANCE] = \
               set(i.name for i in self._DetermineInstances())
           elif level == locking.LEVEL_NODEGROUP:
             # Lock node groups for all potential target nodes optimistically, needs
             # verification once nodes have been acquired
             self.needed_locks[locking.LEVEL_NODEGROUP] = \
               self.cfg.GetNodeGroupsFromNodes(self.lock_nodes)
           elif level == locking.LEVEL_NODE:
             self.needed_locks[locking.LEVEL_NODE] = self.lock_nodes
         def CheckPrereq(self):
           # Verify locks
           owned_instances = self.owned_locks(locking.LEVEL_INSTANCE)
           owned_nodes = self.owned_locks(locking.LEVEL_NODE)
           owned_groups = self.owned_locks(locking.LEVEL_NODEGROUP)
           need_nodes = self._DetermineNodes()
           if not owned_nodes.issuperset(need_nodes):
             raise errors.OpPrereqError("Nodes in same group as '%s' changed since"
                                        " locks were acquired, current nodes are"
                                        " are '%s', used to be '%s'; retry the"
                                        " operation" %
                                        (self.op.node_name,
                                         utils.CommaJoin(need_nodes),
                                         utils.CommaJoin(owned_nodes)),
                                        errors.ECODE_STATE)
           wanted_groups = self.cfg.GetNodeGroupsFromNodes(owned_nodes)
           if owned_groups != wanted_groups:
             raise errors.OpExecError("Node groups changed since locks were acquired,"
                                      " current groups are '%s', used to be '%s';"
                                      " retry the operation" %
                                      (utils.CommaJoin(wanted_groups),
                                       utils.CommaJoin(owned_groups)))
           # Determine affected instances
           self.instances = self._DetermineInstances()
           self.instance_names = [i.name for i in self.instances]
           if set(self.instance_names) != owned_instances:
             raise errors.OpExecError("Instances on node '%s' changed since locks"
                                      " were acquired, current instances are '%s',"
                                      " used to be '%s'; retry the operation" %
                                      (self.op.node_name,
                                       utils.CommaJoin(self.instance_names),
                                       utils.CommaJoin(owned_instances)))
           if self.instance_names:
             self.LogInfo("Evacuating instances from node '%s': %s",
                          self.op.node_name,
                          utils.CommaJoin(utils.NiceSort(self.instance_names)))
           else:
             self.LogInfo("No instances to evacuate from node '%s'",
                          self.op.node_name)
           if self.op.remote_node is not None:
             for i in self.instances:
               if i.primary_node == self.op.remote_node:
                 raise errors.OpPrereqError("Node %s is the primary node of"
                                            " instance %s, cannot use it as"
                                            " secondary" %
                                            (self.op.remote_node, i.name),
                                            errors.ECODE_INVAL)
         def Exec(self, feedback_fn):
           assert (self.op.iallocator is not None) ^ (self.op.remote_node is not None)
           if not self.instance_names:
             # No instances to evacuate
             jobs = []
           elif self.op.iallocator is not None:
             # TODO: Implement relocation to other group
             ial = IAllocator(self.cfg, self.rpc, constants.IALLOCATOR_MODE_NODE_EVAC,
                              evac_mode=self._MODE2IALLOCATOR[self.op.mode],
                              instances=list(self.instance_names))
             ial.Run(self.op.iallocator)
             if not ial.success:
               raise errors.OpPrereqError("Can't compute node evacuation using"
                                          " iallocator '%s': %s" %
                                          (self.op.iallocator, ial.info),
                                          errors.ECODE_NORES)
             jobs = _LoadNodeEvacResult(self, ial.result, self.op.early_release, True)
           elif self.op.remote_node is not None:
             assert self.op.mode == constants.NODE_EVAC_SEC
             jobs = [
               [opcodes.OpInstanceReplaceDisks(instance_name=instance_name,
                                               remote_node=self.op.remote_node,
                                               disks=[],
                                               mode=constants.REPLACE_DISK_CHG,
                                               early_release=self.op.early_release)]
               for instance_name in self.instance_names
+              ]
           else:
             raise errors.ProgrammerError("No iallocator or remote node")
           return ResultWithJobs(jobs)
       def _SetOpEarlyRelease(early_release, op):
         """Sets C{early_release} flag on opcodes if available.
         """
         try:
           op.early_release = early_release
         except AttributeError:
           assert not isinstance(op, opcodes.OpInstanceReplaceDisks)
         return op
       def _NodeEvacDest(use_nodes, group, nodes):
         """Returns group or nodes depending on caller's choice.
         """
         if use_nodes:
           return utils.CommaJoin(nodes)
         else:
           return group
       def _LoadNodeEvacResult(lu, alloc_result, early_release, use_nodes):
         """Unpacks the result of change-group and node-evacuate iallocator requests.
         Iallocator modes L{constants.IALLOCATOR_MODE_NODE_EVAC} and
         L{constants.IALLOCATOR_MODE_CHG_GROUP}.
         @type lu: L{LogicalUnit}
         @param lu: Logical unit instance
         @type alloc_result: tuple/list
         @param alloc_result: Result from iallocator
         @type early_release: bool
         @param early_release: Whether to release locks early if possible
         @type use_nodes: bool
         @param use_nodes: Whether to display node names instead of groups
         """
         (moved, failed, jobs) = alloc_result
         if failed:
           failreason = utils.CommaJoin("%s (%s)" % (name, reason)
                                        for (name, reason) in failed)
           lu.LogWarning("Unable to evacuate instances %s", failreason)
           raise errors.OpExecError("Unable to evacuate instances %s" % failreason)
         if moved:
           lu.LogInfo("Instances to be moved: %s",
                      utils.CommaJoin("%s (to %s)" %
                                      (name, _NodeEvacDest(use_nodes, group, nodes))
                                      for (name, group, nodes) in moved))
         return [map(compat.partial(_SetOpEarlyRelease, early_release),
                     map(opcodes.OpCode.LoadOpCode, ops))
                 for ops in jobs]
       class LUInstanceGrowDisk(LogicalUnit):
         """Grow a disk of an instance.
         """
         HPATH = "disk-grow"
         HTYPE = constants.HTYPE_INSTANCE
         REQ_BGL = False
         def ExpandNames(self):
           self._ExpandAndLockInstance()
           self.needed_locks[locking.LEVEL_NODE] = []
           self.needed_locks[locking.LEVEL_NODE_RES] = []
           self.recalculate_locks[locking.LEVEL_NODE_RES] = constants.LOCKS_REPLACE
         def DeclareLocks(self, level):
           if level == locking.LEVEL_NODE:
             self._LockInstancesNodes()
           elif level == locking.LEVEL_NODE_RES:
             # Copy node locks
             self.needed_locks[locking.LEVEL_NODE_RES] = \
               self.needed_locks[locking.LEVEL_NODE][:]
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on the master, the primary and all the secondaries.
           """
           env = {
             "DISK": self.op.disk,
             "AMOUNT": self.op.amount,
+            }
           env.update(_BuildInstanceHookEnvByObject(self, self.instance))
           return env
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           nl = [self.cfg.GetMasterNode()] + list(self.instance.all_nodes)
           return (nl, nl)
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the instance is in the cluster.
           """
           instance = self.cfg.GetInstanceInfo(self.op.instance_name)
           assert instance is not None, \
             "Cannot retrieve locked instance %s" % self.op.instance_name
           nodenames = list(instance.all_nodes)
           for node in nodenames:
             _CheckNodeOnline(self, node)
           self.instance = instance
           if instance.disk_template not in constants.DTS_GROWABLE:
             raise errors.OpPrereqError("Instance's disk layout does not support"
                                        " growing", errors.ECODE_INVAL)
           self.disk = instance.FindDisk(self.op.disk)
           if instance.disk_template not in (constants.DT_FILE,
                                             constants.DT_SHARED_FILE):
             # TODO: check the free disk space for file, when that feature will be
             # supported
             _CheckNodesFreeDiskPerVG(self, nodenames,
                                      self.disk.ComputeGrowth(self.op.amount))
         def Exec(self, feedback_fn):
           """Execute disk grow.
           """
           instance = self.instance
           disk = self.disk
           assert set([instance.name]) == self.owned_locks(locking.LEVEL_INSTANCE)
           assert (self.owned_locks(locking.LEVEL_NODE) ==
                   self.owned_locks(locking.LEVEL_NODE_RES))
           disks_ok, _ = _AssembleInstanceDisks(self, self.instance, disks=[disk])
           if not disks_ok:
             raise errors.OpExecError("Cannot activate block device to grow")
           feedback_fn("Growing disk %s of instance '%s' by %s" %
                       (self.op.disk, instance.name,
                        utils.FormatUnit(self.op.amount, "h")))
           # First run all grow ops in dry-run mode
           for node in instance.all_nodes:
             self.cfg.SetDiskID(disk, node)
             result = self.rpc.call_blockdev_grow(node, disk, self.op.amount, True)
             result.Raise("Grow request failed to node %s" % node)
           # We know that (as far as we can test) operations across different
           # nodes will succeed, time to run it for real
           for node in instance.all_nodes:
             self.cfg.SetDiskID(disk, node)
             result = self.rpc.call_blockdev_grow(node, disk, self.op.amount, False)
             result.Raise("Grow request failed to node %s" % node)
             # TODO: Rewrite code to work properly
             # DRBD goes into sync mode for a short amount of time after executing the
             # "resize" command. DRBD 8.x below version 8.0.13 contains a bug whereby
             # calling "resize" in sync mode fails. Sleeping for a short amount of
             # time is a work-around.
             time.sleep(5)
           disk.RecordGrow(self.op.amount)
           self.cfg.Update(instance, feedback_fn)
           # Changes have been recorded, release node lock
           _ReleaseLocks(self, locking.LEVEL_NODE)
           # Downgrade lock while waiting for sync
           self.glm.downgrade(locking.LEVEL_INSTANCE)
           if self.op.wait_for_sync:
             disk_abort = not _WaitForSync(self, instance, disks=[disk])
             if disk_abort:
               self.proc.LogWarning("Disk sync-ing has not returned a good"
                                    " status; please check the instance")
             if instance.admin_state != constants.ADMINST_UP:
               _SafeShutdownInstanceDisks(self, instance, disks=[disk])
           elif instance.admin_state != constants.ADMINST_UP:
             self.proc.LogWarning("Not shutting down the disk even if the instance is"
                                  " not supposed to be running because no wait for"
                                  " sync mode was requested")
           assert self.owned_locks(locking.LEVEL_NODE_RES)
           assert set([instance.name]) == self.owned_locks(locking.LEVEL_INSTANCE)
       class LUInstanceQueryData(NoHooksLU):
         """Query runtime instance data.
         """
         REQ_BGL = False
         def ExpandNames(self):
           self.needed_locks = {}
           # Use locking if requested or when non-static information is wanted
           if not (self.op.static or self.op.use_locking):
             self.LogWarning("Non-static data requested, locks need to be acquired")
             self.op.use_locking = True
           if self.op.instances or not self.op.use_locking:
             # Expand instance names right here
             self.wanted_names = _GetWantedInstances(self, self.op.instances)
           else:
             # Will use acquired locks
             self.wanted_names = None
           if self.op.use_locking:
             self.share_locks = _ShareAll()
             if self.wanted_names is None:
               self.needed_locks[locking.LEVEL_INSTANCE] = locking.ALL_SET
             else:
               self.needed_locks[locking.LEVEL_INSTANCE] = self.wanted_names
             self.needed_locks[locking.LEVEL_NODE] = []
             self.recalculate_locks[locking.LEVEL_NODE] = constants.LOCKS_REPLACE
         def DeclareLocks(self, level):
           if self.op.use_locking and level == locking.LEVEL_NODE:
             self._LockInstancesNodes()
         def CheckPrereq(self):
           """Check prerequisites.
           This only checks the optional instance list against the existing names.
           """
           if self.wanted_names is None:
             assert self.op.use_locking, "Locking was not used"
             self.wanted_names = self.owned_locks(locking.LEVEL_INSTANCE)
           self.wanted_instances = \
               map(compat.snd, self.cfg.GetMultiInstanceInfo(self.wanted_names))
         def _ComputeBlockdevStatus(self, node, instance_name, dev):
           """Returns the status of a block device
           """
           if self.op.static or not node:
             return None
           self.cfg.SetDiskID(dev, node)
           result = self.rpc.call_blockdev_find(node, dev)
           if result.offline:
             return None
           result.Raise("Can't compute disk status for %s" % instance_name)
           status = result.payload
           if status is None:
             return None
           return (status.dev_path, status.major, status.minor,
                   status.sync_percent, status.estimated_time,
                   status.is_degraded, status.ldisk_status)
         def _ComputeDiskStatus(self, instance, snode, dev):
           """Compute block device status.
           """
           if dev.dev_type in constants.LDS_DRBD:
             # we change the snode then (otherwise we use the one passed in)
             if dev.logical_id[0] == instance.primary_node:
               snode = dev.logical_id[1]
             else:
               snode = dev.logical_id[0]
           dev_pstatus = self._ComputeBlockdevStatus(instance.primary_node,
                                                     instance.name, dev)
           dev_sstatus = self._ComputeBlockdevStatus(snode, instance.name, dev)
           if dev.children:
             dev_children = map(compat.partial(self._ComputeDiskStatus,
                                               instance, snode),
                                dev.children)
           else:
             dev_children = []
           return {
             "iv_name": dev.iv_name,
             "dev_type": dev.dev_type,
             "logical_id": dev.logical_id,
             "physical_id": dev.physical_id,
             "pstatus": dev_pstatus,
             "sstatus": dev_sstatus,
             "children": dev_children,
             "mode": dev.mode,
             "size": dev.size,
+            }
         def Exec(self, feedback_fn):
           """Gather and return data"""
           result = {}
           cluster = self.cfg.GetClusterInfo()
           pri_nodes = self.cfg.GetMultiNodeInfo(i.primary_node
                                                 for i in self.wanted_instances)
           for instance, (_, pnode) in zip(self.wanted_instances, pri_nodes):
             if self.op.static or pnode.offline:
               remote_state = None
               if pnode.offline:
                 self.LogWarning("Primary node %s is marked offline, returning static"
                                 " information only for instance %s" %
                                 (pnode.name, instance.name))
             else:
               remote_info = self.rpc.call_instance_info(instance.primary_node,
                                                         instance.name,
                                                         instance.hypervisor)
               remote_info.Raise("Error checking node %s" % instance.primary_node)
               remote_info = remote_info.payload
               if remote_info and "state" in remote_info:
                 remote_state = "up"
               else:
                 if instance.admin_state == constants.ADMINST_UP:
                   remote_state = "down"
                 else:
                   remote_state = instance.admin_state
             disks = map(compat.partial(self._ComputeDiskStatus, instance, None),
                         instance.disks)
             result[instance.name] = {
               "name": instance.name,
               "config_state": instance.admin_state,
               "run_state": remote_state,
               "pnode": instance.primary_node,
               "snodes": instance.secondary_nodes,
               "os": instance.os,
               # this happens to be the same format used for hooks
               "nics": _NICListToTuple(self, instance.nics),
               "disk_template": instance.disk_template,
               "disks": disks,
               "hypervisor": instance.hypervisor,
               "network_port": instance.network_port,
               "hv_instance": instance.hvparams,
               "hv_actual": cluster.FillHV(instance, skip_globals=True),
               "be_instance": instance.beparams,
               "be_actual": cluster.FillBE(instance),
               "os_instance": instance.osparams,
               "os_actual": cluster.SimpleFillOS(instance.os, instance.osparams),
               "serial_no": instance.serial_no,
               "mtime": instance.mtime,
               "ctime": instance.ctime,
               "uuid": instance.uuid,
+              }
           return result
       class LUInstanceSetParams(LogicalUnit):
         """Modifies an instances's parameters.
         """
         HPATH = "instance-modify"
         HTYPE = constants.HTYPE_INSTANCE
         REQ_BGL = False
         def CheckArguments(self):
           if not (self.op.nics or self.op.disks or self.op.disk_template or
                   self.op.hvparams or self.op.beparams or self.op.os_name or
                   self.op.online_inst or self.op.offline_inst):
             raise errors.OpPrereqError("No changes submitted", errors.ECODE_INVAL)
           if self.op.hvparams:
             _CheckGlobalHvParams(self.op.hvparams)
           # Disk validation
           disk_addremove = 0
           for disk_op, disk_dict in self.op.disks:
             utils.ForceDictType(disk_dict, constants.IDISK_PARAMS_TYPES)
             if disk_op == constants.DDM_REMOVE:
               disk_addremove += 1
               continue
             elif disk_op == constants.DDM_ADD:
               disk_addremove += 1
             else:
               if not isinstance(disk_op, int):
                 raise errors.OpPrereqError("Invalid disk index", errors.ECODE_INVAL)
               if not isinstance(disk_dict, dict):
                 msg = "Invalid disk value: expected dict, got '%s'" % disk_dict
                 raise errors.OpPrereqError(msg, errors.ECODE_INVAL)
             if disk_op == constants.DDM_ADD:
               mode = disk_dict.setdefault(constants.IDISK_MODE, constants.DISK_RDWR)
               if mode not in constants.DISK_ACCESS_SET:
                 raise errors.OpPrereqError("Invalid disk access mode '%s'" % mode,
                                            errors.ECODE_INVAL)
               size = disk_dict.get(constants.IDISK_SIZE, None)
               if size is None:
                 raise errors.OpPrereqError("Required disk parameter size missing",
                                            errors.ECODE_INVAL)
               try:
                 size = int(size)
               except (TypeError, ValueError), err:
                 raise errors.OpPrereqError("Invalid disk size parameter: %s" %
                                            str(err), errors.ECODE_INVAL)
               disk_dict[constants.IDISK_SIZE] = size
             else:
               # modification of disk
               if constants.IDISK_SIZE in disk_dict:
                 raise errors.OpPrereqError("Disk size change not possible, use"
                                            " grow-disk", errors.ECODE_INVAL)
           if disk_addremove > 1:
             raise errors.OpPrereqError("Only one disk add or remove operation"
                                        " supported at a time", errors.ECODE_INVAL)
           if self.op.disks and self.op.disk_template is not None:
             raise errors.OpPrereqError("Disk template conversion and other disk"
                                        " changes not supported at the same time",
                                        errors.ECODE_INVAL)
           if (self.op.disk_template and
               self.op.disk_template in constants.DTS_INT_MIRROR and
               self.op.remote_node is None):
             raise errors.OpPrereqError("Changing the disk template to a mirrored"
                                        " one requires specifying a secondary node",
                                        errors.ECODE_INVAL)
           # NIC validation
           nic_addremove = 0
           for nic_op, nic_dict in self.op.nics:
             utils.ForceDictType(nic_dict, constants.INIC_PARAMS_TYPES)
             if nic_op == constants.DDM_REMOVE:
               nic_addremove += 1
               continue
             elif nic_op == constants.DDM_ADD:
               nic_addremove += 1
             else:
               if not isinstance(nic_op, int):
                 raise errors.OpPrereqError("Invalid nic index", errors.ECODE_INVAL)
               if not isinstance(nic_dict, dict):
                 msg = "Invalid nic value: expected dict, got '%s'" % nic_dict
                 raise errors.OpPrereqError(msg, errors.ECODE_INVAL)
             # nic_dict should be a dict
             nic_ip = nic_dict.get(constants.INIC_IP, None)
             if nic_ip is not None:
               if nic_ip.lower() == constants.VALUE_NONE:
                 nic_dict[constants.INIC_IP] = None
               else:
                 if not netutils.IPAddress.IsValid(nic_ip):
                   raise errors.OpPrereqError("Invalid IP address '%s'" % nic_ip,
                                              errors.ECODE_INVAL)
             nic_bridge = nic_dict.get("bridge", None)
             nic_link = nic_dict.get(constants.INIC_LINK, None)
             if nic_bridge and nic_link:
               raise errors.OpPrereqError("Cannot pass 'bridge' and 'link'"
                                          " at the same time", errors.ECODE_INVAL)
             elif nic_bridge and nic_bridge.lower() == constants.VALUE_NONE:
               nic_dict["bridge"] = None
             elif nic_link and nic_link.lower() == constants.VALUE_NONE:
               nic_dict[constants.INIC_LINK] = None
             if nic_op == constants.DDM_ADD:
               nic_mac = nic_dict.get(constants.INIC_MAC, None)
               if nic_mac is None:
                 nic_dict[constants.INIC_MAC] = constants.VALUE_AUTO
             if constants.INIC_MAC in nic_dict:
               nic_mac = nic_dict[constants.INIC_MAC]
               if nic_mac not in (constants.VALUE_AUTO, constants.VALUE_GENERATE):
                 nic_mac = utils.NormalizeAndValidateMac(nic_mac)
               if nic_op != constants.DDM_ADD and nic_mac == constants.VALUE_AUTO:
                 raise errors.OpPrereqError("'auto' is not a valid MAC address when"
                                            " modifying an existing nic",
                                            errors.ECODE_INVAL)
           if nic_addremove > 1:
             raise errors.OpPrereqError("Only one NIC add or remove operation"
                                        " supported at a time", errors.ECODE_INVAL)
         def ExpandNames(self):
           self._ExpandAndLockInstance()
           # Can't even acquire node locks in shared mode as upcoming changes in
           # Ganeti 2.6 will start to modify the node object on disk conversion
           self.needed_locks[locking.LEVEL_NODE] = []
           self.needed_locks[locking.LEVEL_NODE_RES] = []
           self.recalculate_locks[locking.LEVEL_NODE] = constants.LOCKS_REPLACE
         def DeclareLocks(self, level):
           if level == locking.LEVEL_NODE:
             self._LockInstancesNodes()
             if self.op.disk_template and self.op.remote_node:
               self.op.remote_node = _ExpandNodeName(self.cfg, self.op.remote_node)
               self.needed_locks[locking.LEVEL_NODE].append(self.op.remote_node)
           elif level == locking.LEVEL_NODE_RES and self.op.disk_template:
             # Copy node locks
             self.needed_locks[locking.LEVEL_NODE_RES] = \
               self.needed_locks[locking.LEVEL_NODE][:]
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on the master, primary and secondaries.
           """
           args = dict()
           if constants.BE_MINMEM in self.be_new:
             args["minmem"] = self.be_new[constants.BE_MINMEM]
           if constants.BE_MAXMEM in self.be_new:
             args["maxmem"] = self.be_new[constants.BE_MAXMEM]
           if constants.BE_VCPUS in self.be_new:
             args["vcpus"] = self.be_new[constants.BE_VCPUS]
           # TODO: export disk changes. Note: _BuildInstanceHookEnv* don't export disk
           # information at all.
           if self.op.nics:
             args["nics"] = []
             nic_override = dict(self.op.nics)
             for idx, nic in enumerate(self.instance.nics):
               if idx in nic_override:
                 this_nic_override = nic_override[idx]
               else:
                 this_nic_override = {}
               if constants.INIC_IP in this_nic_override:
                 ip = this_nic_override[constants.INIC_IP]
               else:
                 ip = nic.ip
               if constants.INIC_MAC in this_nic_override:
                 mac = this_nic_override[constants.INIC_MAC]
               else:
                 mac = nic.mac
               if idx in self.nic_pnew:
                 nicparams = self.nic_pnew[idx]
               else:
                 nicparams = self.cluster.SimpleFillNIC(nic.nicparams)
               mode = nicparams[constants.NIC_MODE]
               link = nicparams[constants.NIC_LINK]
               args["nics"].append((ip, mac, mode, link))
             if constants.DDM_ADD in nic_override:
               ip = nic_override[constants.DDM_ADD].get(constants.INIC_IP, None)
               mac = nic_override[constants.DDM_ADD][constants.INIC_MAC]
               nicparams = self.nic_pnew[constants.DDM_ADD]
               mode = nicparams[constants.NIC_MODE]
               link = nicparams[constants.NIC_LINK]
               args["nics"].append((ip, mac, mode, link))
             elif constants.DDM_REMOVE in nic_override:
               del args["nics"][-1]
           env = _BuildInstanceHookEnvByObject(self, self.instance, override=args)
           if self.op.disk_template:
             env["NEW_DISK_TEMPLATE"] = self.op.disk_template
           return env
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           nl = [self.cfg.GetMasterNode()] + list(self.instance.all_nodes)
           return (nl, nl)
         def CheckPrereq(self):
           """Check prerequisites.
           This only checks the instance list against the existing names.
           """
           # checking the new params on the primary/secondary nodes
           instance = self.instance = self.cfg.GetInstanceInfo(self.op.instance_name)
           cluster = self.cluster = self.cfg.GetClusterInfo()
           assert self.instance is not None, \
             "Cannot retrieve locked instance %s" % self.op.instance_name
           pnode = instance.primary_node
           nodelist = list(instance.all_nodes)
           pnode_info = self.cfg.GetNodeInfo(pnode)
           self.diskparams = self.cfg.GetNodeGroup(pnode_info.group).diskparams
           # OS change
           if self.op.os_name and not self.op.force:
             _CheckNodeHasOS(self, instance.primary_node, self.op.os_name,
                             self.op.force_variant)
             instance_os = self.op.os_name
           else:
             instance_os = instance.os
           if self.op.disk_template:
             if instance.disk_template == self.op.disk_template:
               raise errors.OpPrereqError("Instance already has disk template %s" %
                                          instance.disk_template, errors.ECODE_INVAL)
             if (instance.disk_template,
                 self.op.disk_template) not in self._DISK_CONVERSIONS:
               raise errors.OpPrereqError("Unsupported disk template conversion from"
                                          " %s to %s" % (instance.disk_template,
                                                         self.op.disk_template),
                                          errors.ECODE_INVAL)
             _CheckInstanceState(self, instance, INSTANCE_DOWN,
                                 msg="cannot change disk template")
             if self.op.disk_template in constants.DTS_INT_MIRROR:
               if self.op.remote_node == pnode:
                 raise errors.OpPrereqError("Given new secondary node %s is the same"
                                            " as the primary node of the instance" %
                                            self.op.remote_node, errors.ECODE_STATE)
               _CheckNodeOnline(self, self.op.remote_node)
               _CheckNodeNotDrained(self, self.op.remote_node)
               # FIXME: here we assume that the old instance type is DT_PLAIN
               assert instance.disk_template == constants.DT_PLAIN
               disks = [{constants.IDISK_SIZE: d.size,
                         constants.IDISK_VG: d.logical_id[0]}
                        for d in instance.disks]
               required = _ComputeDiskSizePerVG(self.op.disk_template, disks)
               _CheckNodesFreeDiskPerVG(self, [self.op.remote_node], required)
               snode_info = self.cfg.GetNodeInfo(self.op.remote_node)
               if pnode_info.group != snode_info.group:
                 self.LogWarning("The primary and secondary nodes are in two"
                                 " different node groups; the disk parameters"
                                 " from the first disk's node group will be"
                                 " used")
           # hvparams processing
           if self.op.hvparams:
             hv_type = instance.hypervisor
             i_hvdict = _GetUpdatedParams(instance.hvparams, self.op.hvparams)
             utils.ForceDictType(i_hvdict, constants.HVS_PARAMETER_TYPES)
             hv_new = cluster.SimpleFillHV(hv_type, instance.os, i_hvdict)
             # local check
             hypervisor.GetHypervisor(hv_type).CheckParameterSyntax(hv_new)
             _CheckHVParams(self, nodelist, instance.hypervisor, hv_new)
             self.hv_proposed = self.hv_new = hv_new # the new actual values
             self.hv_inst = i_hvdict # the new dict (without defaults)
           else:
             self.hv_proposed = cluster.SimpleFillHV(instance.hypervisor, instance.os,
                                                     instance.hvparams)
             self.hv_new = self.hv_inst = {}
           # beparams processing
           if self.op.beparams:
             i_bedict = _GetUpdatedParams(instance.beparams, self.op.beparams,
                                          use_none=True)
             objects.UpgradeBeParams(i_bedict)
             utils.ForceDictType(i_bedict, constants.BES_PARAMETER_TYPES)
             be_new = cluster.SimpleFillBE(i_bedict)
             self.be_proposed = self.be_new = be_new # the new actual values
             self.be_inst = i_bedict # the new dict (without defaults)
           else:
             self.be_new = self.be_inst = {}
             self.be_proposed = cluster.SimpleFillBE(instance.beparams)
           be_old = cluster.FillBE(instance)
           # CPU param validation -- checking every time a paramtere is
           # changed to cover all cases where either CPU mask or vcpus have
           # changed
           if (constants.BE_VCPUS in self.be_proposed and
               constants.HV_CPU_MASK in self.hv_proposed):
             cpu_list = \
               utils.ParseMultiCpuMask(self.hv_proposed[constants.HV_CPU_MASK])
             # Verify mask is consistent with number of vCPUs. Can skip this
             # test if only 1 entry in the CPU mask, which means same mask
             # is applied to all vCPUs.
             if (len(cpu_list) > 1 and
                 len(cpu_list) != self.be_proposed[constants.BE_VCPUS]):
               raise errors.OpPrereqError("Number of vCPUs [%d] does not match the"
                                          " CPU mask [%s]" %
                                          (self.be_proposed[constants.BE_VCPUS],
                                           self.hv_proposed[constants.HV_CPU_MASK]),
                                          errors.ECODE_INVAL)
             # Only perform this test if a new CPU mask is given
             if constants.HV_CPU_MASK in self.hv_new:
               # Calculate the largest CPU number requested
               max_requested_cpu = max(map(max, cpu_list))
               # Check that all of the instance's nodes have enough physical CPUs to
               # satisfy the requested CPU mask
               _CheckNodesPhysicalCPUs(self, instance.all_nodes,
                                       max_requested_cpu + 1, instance.hypervisor)
           # osparams processing
           if self.op.osparams:
             i_osdict = _GetUpdatedParams(instance.osparams, self.op.osparams)
             _CheckOSParams(self, True, nodelist, instance_os, i_osdict)
             self.os_inst = i_osdict # the new dict (without defaults)
           else:
             self.os_inst = {}
           self.warn = []
           #TODO(dynmem): do the appropriate check involving MINMEM
           if (constants.BE_MAXMEM in self.op.beparams and not self.op.force and
               be_new[constants.BE_MAXMEM] > be_old[constants.BE_MAXMEM]):
             mem_check_list = [pnode]
             if be_new[constants.BE_AUTO_BALANCE]:
               # either we changed auto_balance to yes or it was from before
               mem_check_list.extend(instance.secondary_nodes)
             instance_info = self.rpc.call_instance_info(pnode, instance.name,
                                                         instance.hypervisor)
             nodeinfo = self.rpc.call_node_info(mem_check_list, None,
                                                [instance.hypervisor])
             pninfo = nodeinfo[pnode]
             msg = pninfo.fail_msg
             if msg:
               # Assume the primary node is unreachable and go ahead
               self.warn.append("Can't get info from primary node %s: %s" %
                                (pnode, msg))
             else:
               (_, _, (pnhvinfo, )) = pninfo.payload
               if not isinstance(pnhvinfo.get("memory_free", None), int):
                 self.warn.append("Node data from primary node %s doesn't contain"
                                  " free memory information" % pnode)
               elif instance_info.fail_msg:
                 self.warn.append("Can't get instance runtime information: %s" %
                                 instance_info.fail_msg)
               else:
                 if instance_info.payload:
                   current_mem = int(instance_info.payload["memory"])
                 else:
                   # Assume instance not running
                   # (there is a slight race condition here, but it's not very
                   # probable, and we have no other way to check)
                   # TODO: Describe race condition
                   current_mem = 0
                 #TODO(dynmem): do the appropriate check involving MINMEM
                 miss_mem = (be_new[constants.BE_MAXMEM] - current_mem -
                             pnhvinfo["memory_free"])
                 if miss_mem > 0:
                   raise errors.OpPrereqError("This change will prevent the instance"
                                              " from starting, due to %d MB of memory"
                                              " missing on its primary node" %
                                              miss_mem,
                                              errors.ECODE_NORES)
             if be_new[constants.BE_AUTO_BALANCE]:
               for node, nres in nodeinfo.items():
                 if node not in instance.secondary_nodes:
                   continue
                 nres.Raise("Can't get info from secondary node %s" % node,
                            prereq=True, ecode=errors.ECODE_STATE)
                 (_, _, (nhvinfo, )) = nres.payload
                 if not isinstance(nhvinfo.get("memory_free", None), int):
                   raise errors.OpPrereqError("Secondary node %s didn't return free"
                                              " memory information" % node,
                                              errors.ECODE_STATE)
                 #TODO(dynmem): do the appropriate check involving MINMEM
                 elif be_new[constants.BE_MAXMEM] > nhvinfo["memory_free"]:
                   raise errors.OpPrereqError("This change will prevent the instance"
                                              " from failover to its secondary node"
                                              " %s, due to not enough memory" % node,
                                              errors.ECODE_STATE)
           # NIC processing
           self.nic_pnew = {}
           self.nic_pinst = {}
           for nic_op, nic_dict in self.op.nics:
             if nic_op == constants.DDM_REMOVE:
               if not instance.nics:
                 raise errors.OpPrereqError("Instance has no NICs, cannot remove",
                                            errors.ECODE_INVAL)
               continue
             if nic_op != constants.DDM_ADD:
               # an existing nic
               if not instance.nics:
                 raise errors.OpPrereqError("Invalid NIC index %s, instance has"
                                            " no NICs" % nic_op,
                                            errors.ECODE_INVAL)
               if nic_op < 0 or nic_op >= len(instance.nics):
                 raise errors.OpPrereqError("Invalid NIC index %s, valid values"
                                            " are 0 to %d" %
                                            (nic_op, len(instance.nics) - 1),
                                            errors.ECODE_INVAL)
               old_nic_params = instance.nics[nic_op].nicparams
               old_nic_ip = instance.nics[nic_op].ip
             else:
               old_nic_params = {}
               old_nic_ip = None
             update_params_dict = dict([(key, nic_dict[key])
                                        for key in constants.NICS_PARAMETERS
                                        if key in nic_dict])
             if "bridge" in nic_dict:
               update_params_dict[constants.NIC_LINK] = nic_dict["bridge"]
             new_nic_params = _GetUpdatedParams(old_nic_params,
                                                update_params_dict)
             utils.ForceDictType(new_nic_params, constants.NICS_PARAMETER_TYPES)
             new_filled_nic_params = cluster.SimpleFillNIC(new_nic_params)
             objects.NIC.CheckParameterSyntax(new_filled_nic_params)
             self.nic_pinst[nic_op] = new_nic_params
             self.nic_pnew[nic_op] = new_filled_nic_params
             new_nic_mode = new_filled_nic_params[constants.NIC_MODE]
             if new_nic_mode == constants.NIC_MODE_BRIDGED:
               nic_bridge = new_filled_nic_params[constants.NIC_LINK]
               msg = self.rpc.call_bridges_exist(pnode, [nic_bridge]).fail_msg
               if msg:
                 msg = "Error checking bridges on node %s: %s" % (pnode, msg)
                 if self.op.force:
                   self.warn.append(msg)
                 else:
                   raise errors.OpPrereqError(msg, errors.ECODE_ENVIRON)
             if new_nic_mode == constants.NIC_MODE_ROUTED:
               if constants.INIC_IP in nic_dict:
                 nic_ip = nic_dict[constants.INIC_IP]
               else:
                 nic_ip = old_nic_ip
               if nic_ip is None:
                 raise errors.OpPrereqError("Cannot set the nic ip to None"
                                            " on a routed nic", errors.ECODE_INVAL)
             if constants.INIC_MAC in nic_dict:
               nic_mac = nic_dict[constants.INIC_MAC]
               if nic_mac is None:
                 raise errors.OpPrereqError("Cannot set the nic mac to None",
                                            errors.ECODE_INVAL)
               elif nic_mac in (constants.VALUE_AUTO, constants.VALUE_GENERATE):
                 # otherwise generate the mac
                 nic_dict[constants.INIC_MAC] = \
                   self.cfg.GenerateMAC(self.proc.GetECId())
               else:
                 # or validate/reserve the current one
                 try:
                   self.cfg.ReserveMAC(nic_mac, self.proc.GetECId())
                 except errors.ReservationError:
                   raise errors.OpPrereqError("MAC address %s already in use"
                                              " in cluster" % nic_mac,
                                              errors.ECODE_NOTUNIQUE)
           # DISK processing
           if self.op.disks and instance.disk_template == constants.DT_DISKLESS:
             raise errors.OpPrereqError("Disk operations not supported for"
                                        " diskless instances",
                                        errors.ECODE_INVAL)
           for disk_op, _ in self.op.disks:
             if disk_op == constants.DDM_REMOVE:
               if len(instance.disks) == 1:
                 raise errors.OpPrereqError("Cannot remove the last disk of"
                                            " an instance", errors.ECODE_INVAL)
               _CheckInstanceState(self, instance, INSTANCE_DOWN,
                                   msg="cannot remove disks")
             if (disk_op == constants.DDM_ADD and
                 len(instance.disks) >= constants.MAX_DISKS):
               raise errors.OpPrereqError("Instance has too many disks (%d), cannot"
                                          " add more" % constants.MAX_DISKS,
                                          errors.ECODE_STATE)
             if disk_op not in (constants.DDM_ADD, constants.DDM_REMOVE):
               # an existing disk
               if disk_op < 0 or disk_op >= len(instance.disks):
                 raise errors.OpPrereqError("Invalid disk index %s, valid values"
                                            " are 0 to %d" %
                                            (disk_op, len(instance.disks)),
                                            errors.ECODE_INVAL)
           # disabling the instance
           if self.op.offline_inst:
             _CheckInstanceState(self, instance, INSTANCE_DOWN,
                                 msg="cannot change instance state to offline")
           # enabling the instance
           if self.op.online_inst:
             _CheckInstanceState(self, instance, INSTANCE_OFFLINE,
                                 msg="cannot make instance go online")
         def _ConvertPlainToDrbd(self, feedback_fn):
           """Converts an instance from plain to drbd.
           """
           feedback_fn("Converting template to drbd")
           instance = self.instance
           pnode = instance.primary_node
           snode = self.op.remote_node
           assert instance.disk_template == constants.DT_PLAIN
           # create a fake disk info for _GenerateDiskTemplate
           disk_info = [{constants.IDISK_SIZE: d.size, constants.IDISK_MODE: d.mode,
                         constants.IDISK_VG: d.logical_id[0]}
                        for d in instance.disks]
           new_disks = _GenerateDiskTemplate(self, self.op.disk_template,
                                             instance.name, pnode, [snode],
                                             disk_info, None, None, 0, feedback_fn,
                                             self.diskparams)
           info = _GetInstanceInfoText(instance)
           feedback_fn("Creating aditional volumes...")
           # first, create the missing data and meta devices
           for disk in new_disks:
             # unfortunately this is... not too nice
             _CreateSingleBlockDev(self, pnode, instance, disk.children[1],
                                   info, True)
             for child in disk.children:
               _CreateSingleBlockDev(self, snode, instance, child, info, True)
           # at this stage, all new LVs have been created, we can rename the
           # old ones
           feedback_fn("Renaming original volumes...")
           rename_list = [(o, n.children[0].logical_id)
                          for (o, n) in zip(instance.disks, new_disks)]
           result = self.rpc.call_blockdev_rename(pnode, rename_list)
           result.Raise("Failed to rename original LVs")
           feedback_fn("Initializing DRBD devices...")
           # all child devices are in place, we can now create the DRBD devices
           for disk in new_disks:
             for node in [pnode, snode]:
               f_create = node == pnode
               _CreateSingleBlockDev(self, node, instance, disk, info, f_create)
           # at this point, the instance has been modified
           instance.disk_template = constants.DT_DRBD8
           instance.disks = new_disks
           self.cfg.Update(instance, feedback_fn)
           # Release node locks while waiting for sync
           _ReleaseLocks(self, locking.LEVEL_NODE)
           # disks are created, waiting for sync
           disk_abort = not _WaitForSync(self, instance,
                                         oneshot=not self.op.wait_for_sync)
           if disk_abort:
             raise errors.OpExecError("There are some degraded disks for"
                                      " this instance, please cleanup manually")
           # Node resource locks will be released by caller
         def _ConvertDrbdToPlain(self, feedback_fn):
           """Converts an instance from drbd to plain.
           """
           instance = self.instance
           assert len(instance.secondary_nodes) == 1
           assert instance.disk_template == constants.DT_DRBD8
           pnode = instance.primary_node
           snode = instance.secondary_nodes[0]
           feedback_fn("Converting template to plain")
           old_disks = instance.disks
           new_disks = [d.children[0] for d in old_disks]
           # copy over size and mode
           for parent, child in zip(old_disks, new_disks):
             child.size = parent.size
             child.mode = parent.mode
           # update instance structure
           instance.disks = new_disks
           instance.disk_template = constants.DT_PLAIN
           self.cfg.Update(instance, feedback_fn)
           # Release locks in case removing disks takes a while
           _ReleaseLocks(self, locking.LEVEL_NODE)
           feedback_fn("Removing volumes on the secondary node...")
           for disk in old_disks:
             self.cfg.SetDiskID(disk, snode)
             msg = self.rpc.call_blockdev_remove(snode, disk).fail_msg
             if msg:
               self.LogWarning("Could not remove block device %s on node %s,"
                               " continuing anyway: %s", disk.iv_name, snode, msg)
           feedback_fn("Removing unneeded volumes on the primary node...")
           for idx, disk in enumerate(old_disks):
             meta = disk.children[1]
             self.cfg.SetDiskID(meta, pnode)
             msg = self.rpc.call_blockdev_remove(pnode, meta).fail_msg
             if msg:
               self.LogWarning("Could not remove metadata for disk %d on node %s,"
                               " continuing anyway: %s", idx, pnode, msg)
           # this is a DRBD disk, return its port to the pool
           for disk in old_disks:
             tcp_port = disk.logical_id[2]
             self.cfg.AddTcpUdpPort(tcp_port)
           # Node resource locks will be released by caller
         def Exec(self, feedback_fn):
           """Modifies an instance.
           All parameters take effect only at the next restart of the instance.
           """
           # Process here the warnings from CheckPrereq, as we don't have a
           # feedback_fn there.
           for warn in self.warn:
             feedback_fn("WARNING: %s" % warn)
           assert ((self.op.disk_template is None) ^
                   bool(self.owned_locks(locking.LEVEL_NODE_RES))), \
             "Not owning any node resource locks"
           result = []
           instance = self.instance
           # disk changes
           for disk_op, disk_dict in self.op.disks:
             if disk_op == constants.DDM_REMOVE:
               # remove the last disk
               device = instance.disks.pop()
               device_idx = len(instance.disks)
               for node, disk in device.ComputeNodeTree(instance.primary_node):
                 self.cfg.SetDiskID(disk, node)
                 msg = self.rpc.call_blockdev_remove(node, disk).fail_msg
                 if msg:
                   self.LogWarning("Could not remove disk/%d on node %s: %s,"
                                   " continuing anyway", device_idx, node, msg)
               result.append(("disk/%d" % device_idx, "remove"))
               # if this is a DRBD disk, return its port to the pool
               if device.dev_type in constants.LDS_DRBD:
                 tcp_port = device.logical_id[2]
                 self.cfg.AddTcpUdpPort(tcp_port)
             elif disk_op == constants.DDM_ADD:
               # add a new disk
               if instance.disk_template in (constants.DT_FILE,
                                               constants.DT_SHARED_FILE):
                 file_driver, file_path = instance.disks[0].logical_id
                 file_path = os.path.dirname(file_path)
               else:
                 file_driver = file_path = None
               disk_idx_base = len(instance.disks)
               new_disk = _GenerateDiskTemplate(self,
                                                instance.disk_template,
                                                instance.name, instance.primary_node,
                                                instance.secondary_nodes,
                                                [disk_dict],
                                                file_path,
                                                file_driver,
                                                disk_idx_base,
                                                feedback_fn,
                                                self.diskparams)[0]
               instance.disks.append(new_disk)
               info = _GetInstanceInfoText(instance)
               logging.info("Creating volume %s for instance %s",
                            new_disk.iv_name, instance.name)
               # Note: this needs to be kept in sync with _CreateDisks
               #HARDCODE
               for node in instance.all_nodes:
                 f_create = node == instance.primary_node
                 try:
                   _CreateBlockDev(self, node, instance, new_disk,
                                   f_create, info, f_create)
                 except errors.OpExecError, err:
                   self.LogWarning("Failed to create volume %s (%s) on"
                                   " node %s: %s",
                                   new_disk.iv_name, new_disk, node, err)
               result.append(("disk/%d" % disk_idx_base, "add:size=%s,mode=%s" %
                              (new_disk.size, new_disk.mode)))
             else:
               # change a given disk
               instance.disks[disk_op].mode = disk_dict[constants.IDISK_MODE]
               result.append(("disk.mode/%d" % disk_op,
                              disk_dict[constants.IDISK_MODE]))
           if self.op.disk_template:
             if __debug__:
               check_nodes = set(instance.all_nodes)
               if self.op.remote_node:
                 check_nodes.add(self.op.remote_node)
               for level in [locking.LEVEL_NODE, locking.LEVEL_NODE_RES]:
                 owned = self.owned_locks(level)
                 assert not (check_nodes - owned), \
                   ("Not owning the correct locks, owning %r, expected at least %r" %
                    (owned, check_nodes))
             r_shut = _ShutdownInstanceDisks(self, instance)
             if not r_shut:
               raise errors.OpExecError("Cannot shutdown instance disks, unable to"
                                        " proceed with disk template conversion")
             mode = (instance.disk_template, self.op.disk_template)
             try:
               self._DISK_CONVERSIONS[mode](self, feedback_fn)
             except:
               self.cfg.ReleaseDRBDMinors(instance.name)
               raise
             result.append(("disk_template", self.op.disk_template))
             assert instance.disk_template == self.op.disk_template, \
               ("Expected disk template '%s', found '%s'" %
                (self.op.disk_template, instance.disk_template))
           # Release node and resource locks if there are any (they might already have
           # been released during disk conversion)
           _ReleaseLocks(self, locking.LEVEL_NODE)
           _ReleaseLocks(self, locking.LEVEL_NODE_RES)
           # NIC changes
           for nic_op, nic_dict in self.op.nics:
             if nic_op == constants.DDM_REMOVE:
               # remove the last nic
               del instance.nics[-1]
               result.append(("nic.%d" % len(instance.nics), "remove"))
             elif nic_op == constants.DDM_ADD:
               # mac and bridge should be set, by now
               mac = nic_dict[constants.INIC_MAC]
               ip = nic_dict.get(constants.INIC_IP, None)
               nicparams = self.nic_pinst[constants.DDM_ADD]
               new_nic = objects.NIC(mac=mac, ip=ip, nicparams=nicparams)
               instance.nics.append(new_nic)
               result.append(("nic.%d" % (len(instance.nics) - 1),
                              "add:mac=%s,ip=%s,mode=%s,link=%s" %
                              (new_nic.mac, new_nic.ip,
                               self.nic_pnew[constants.DDM_ADD][constants.NIC_MODE],
                               self.nic_pnew[constants.DDM_ADD][constants.NIC_LINK]
                              )))
             else:
               for key in (constants.INIC_MAC, constants.INIC_IP):
                 if key in nic_dict:
                   setattr(instance.nics[nic_op], key, nic_dict[key])
               if nic_op in self.nic_pinst:
                 instance.nics[nic_op].nicparams = self.nic_pinst[nic_op]
               for key, val in nic_dict.iteritems():
                 result.append(("nic.%s/%d" % (key, nic_op), val))
           # hvparams changes
           if self.op.hvparams:
             instance.hvparams = self.hv_inst
             for key, val in self.op.hvparams.iteritems():
               result.append(("hv/%s" % key, val))
           # beparams changes
           if self.op.beparams:
             instance.beparams = self.be_inst
             for key, val in self.op.beparams.iteritems():
               result.append(("be/%s" % key, val))
           # OS change
           if self.op.os_name:
             instance.os = self.op.os_name
           # osparams changes
           if self.op.osparams:
             instance.osparams = self.os_inst
             for key, val in self.op.osparams.iteritems():
               result.append(("os/%s" % key, val))
           # online/offline instance
           if self.op.online_inst:
             self.cfg.MarkInstanceDown(instance.name)
             result.append(("admin_state", constants.ADMINST_DOWN))
           if self.op.offline_inst:
             self.cfg.MarkInstanceOffline(instance.name)
             result.append(("admin_state", constants.ADMINST_OFFLINE))
           self.cfg.Update(instance, feedback_fn)
           assert not (self.owned_locks(locking.LEVEL_NODE_RES) or
                       self.owned_locks(locking.LEVEL_NODE)), \
             "All node locks should have been released by now"
           return result
         _DISK_CONVERSIONS = {
           (constants.DT_PLAIN, constants.DT_DRBD8): _ConvertPlainToDrbd,
           (constants.DT_DRBD8, constants.DT_PLAIN): _ConvertDrbdToPlain,
+          }
       class LUInstanceChangeGroup(LogicalUnit):
         HPATH = "instance-change-group"
         HTYPE = constants.HTYPE_INSTANCE
         REQ_BGL = False
         def ExpandNames(self):
           self.share_locks = _ShareAll()
           self.needed_locks = {
             locking.LEVEL_NODEGROUP: [],
             locking.LEVEL_NODE: [],
+            }
           self._ExpandAndLockInstance()
           if self.op.target_groups:
             self.req_target_uuids = map(self.cfg.LookupNodeGroup,
                                         self.op.target_groups)
           else:
             self.req_target_uuids = None
           self.op.iallocator = _GetDefaultIAllocator(self.cfg, self.op.iallocator)
         def DeclareLocks(self, level):
           if level == locking.LEVEL_NODEGROUP:
             assert not self.needed_locks[locking.LEVEL_NODEGROUP]
             if self.req_target_uuids:
               lock_groups = set(self.req_target_uuids)
               # Lock all groups used by instance optimistically; this requires going
               # via the node before it's locked, requiring verification later on
               instance_groups = self.cfg.GetInstanceNodeGroups(self.op.instance_name)
               lock_groups.update(instance_groups)
             else:
               # No target groups, need to lock all of them
               lock_groups = locking.ALL_SET
             self.needed_locks[locking.LEVEL_NODEGROUP] = lock_groups
           elif level == locking.LEVEL_NODE:
             if self.req_target_uuids:
               # Lock all nodes used by instances
               self.recalculate_locks[locking.LEVEL_NODE] = constants.LOCKS_APPEND
               self._LockInstancesNodes()
               # Lock all nodes in all potential target groups
               lock_groups = (frozenset(self.owned_locks(locking.LEVEL_NODEGROUP)) -
                              self.cfg.GetInstanceNodeGroups(self.op.instance_name))
               member_nodes = [node_name
                               for group in lock_groups
                               for node_name in self.cfg.GetNodeGroup(group).members]
               self.needed_locks[locking.LEVEL_NODE].extend(member_nodes)
             else:
               # Lock all nodes as all groups are potential targets
               self.needed_locks[locking.LEVEL_NODE] = locking.ALL_SET
         def CheckPrereq(self):
           owned_instances = frozenset(self.owned_locks(locking.LEVEL_INSTANCE))
           owned_groups = frozenset(self.owned_locks(locking.LEVEL_NODEGROUP))
           owned_nodes = frozenset(self.owned_locks(locking.LEVEL_NODE))
           assert (self.req_target_uuids is None or
                   owned_groups.issuperset(self.req_target_uuids))
           assert owned_instances == set([self.op.instance_name])
           # Get instance information
           self.instance = self.cfg.GetInstanceInfo(self.op.instance_name)
           # Check if node groups for locked instance are still correct
           assert owned_nodes.issuperset(self.instance.all_nodes), \
             ("Instance %s's nodes changed while we kept the lock" %
              self.op.instance_name)
           inst_groups = _CheckInstanceNodeGroups(self.cfg, self.op.instance_name,
                                                  owned_groups)
           if self.req_target_uuids:
             # User requested specific target groups
             self.target_uuids = self.req_target_uuids
           else:
             # All groups except those used by the instance are potential targets
             self.target_uuids = owned_groups - inst_groups
           conflicting_groups = self.target_uuids & inst_groups
           if conflicting_groups:
             raise errors.OpPrereqError("Can't use group(s) '%s' as targets, they are"
                                        " used by the instance '%s'" %
                                        (utils.CommaJoin(conflicting_groups),
                                         self.op.instance_name),
                                        errors.ECODE_INVAL)
           if not self.target_uuids:
             raise errors.OpPrereqError("There are no possible target groups",
                                        errors.ECODE_INVAL)
         def BuildHooksEnv(self):
           """Build hooks env.
           """
           assert self.target_uuids
           env = {
             "TARGET_GROUPS": " ".join(self.target_uuids),
+            }
           env.update(_BuildInstanceHookEnvByObject(self, self.instance))
           return env
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           mn = self.cfg.GetMasterNode()
           return ([mn], [mn])
         def Exec(self, feedback_fn):
           instances = list(self.owned_locks(locking.LEVEL_INSTANCE))
           assert instances == [self.op.instance_name], "Instance not locked"
           ial = IAllocator(self.cfg, self.rpc, constants.IALLOCATOR_MODE_CHG_GROUP,
                            instances=instances, target_groups=list(self.target_uuids))
           ial.Run(self.op.iallocator)
           if not ial.success:
             raise errors.OpPrereqError("Can't compute solution for changing group of"
                                        " instance '%s' using iallocator '%s': %s" %
                                        (self.op.instance_name, self.op.iallocator,
                                         ial.info),
                                        errors.ECODE_NORES)
           jobs = _LoadNodeEvacResult(self, ial.result, self.op.early_release, False)
           self.LogInfo("Iallocator returned %s job(s) for changing group of"
                        " instance '%s'", len(jobs), self.op.instance_name)
           return ResultWithJobs(jobs)
       class LUBackupQuery(NoHooksLU):
         """Query the exports list
         """
         REQ_BGL = False
         def ExpandNames(self):
           self.needed_locks = {}
           self.share_locks[locking.LEVEL_NODE] = 1
           if not self.op.nodes:
             self.needed_locks[locking.LEVEL_NODE] = locking.ALL_SET
           else:
             self.needed_locks[locking.LEVEL_NODE] = \
               _GetWantedNodes(self, self.op.nodes)
         def Exec(self, feedback_fn):
           """Compute the list of all the exported system images.
           @rtype: dict
           @return: a dictionary with the structure node->(export-list)
               where export-list is a list of the instances exported on
               that node.
           """
           self.nodes = self.owned_locks(locking.LEVEL_NODE)
           rpcresult = self.rpc.call_export_list(self.nodes)
           result = {}
           for node in rpcresult:
             if rpcresult[node].fail_msg:
               result[node] = False
             else:
               result[node] = rpcresult[node].payload
           return result
       class LUBackupPrepare(NoHooksLU):
         """Prepares an instance for an export and returns useful information.
         """
         REQ_BGL = False
         def ExpandNames(self):
           self._ExpandAndLockInstance()
         def CheckPrereq(self):
           """Check prerequisites.
           """
           instance_name = self.op.instance_name
           self.instance = self.cfg.GetInstanceInfo(instance_name)
           assert self.instance is not None, \
                 "Cannot retrieve locked instance %s" % self.op.instance_name
           _CheckNodeOnline(self, self.instance.primary_node)
           self._cds = _GetClusterDomainSecret()
         def Exec(self, feedback_fn):
           """Prepares an instance for an export.
           """
           instance = self.instance
           if self.op.mode == constants.EXPORT_MODE_REMOTE:
             salt = utils.GenerateSecret(8)
             feedback_fn("Generating X509 certificate on %s" % instance.primary_node)
             result = self.rpc.call_x509_cert_create(instance.primary_node,
                                                     constants.RIE_CERT_VALIDITY)
             result.Raise("Can't create X509 key and certificate on %s" % result.node)
             (name, cert_pem) = result.payload
             cert = OpenSSL.crypto.load_certificate(OpenSSL.crypto.FILETYPE_PEM,
                                                    cert_pem)
             return {
               "handshake": masterd.instance.ComputeRemoteExportHandshake(self._cds),
               "x509_key_name": (name, utils.Sha1Hmac(self._cds, name, salt=salt),
                                 salt),
               "x509_ca": utils.SignX509Certificate(cert, self._cds, salt),
+              }
           return None
       class LUBackupExport(LogicalUnit):
         """Export an instance to an image in the cluster.
         """
         HPATH = "instance-export"
         HTYPE = constants.HTYPE_INSTANCE
         REQ_BGL = False
         def CheckArguments(self):
           """Check the arguments.
           """
           self.x509_key_name = self.op.x509_key_name
           self.dest_x509_ca_pem = self.op.destination_x509_ca
           if self.op.mode == constants.EXPORT_MODE_REMOTE:
             if not self.x509_key_name:
               raise errors.OpPrereqError("Missing X509 key name for encryption",
                                          errors.ECODE_INVAL)
             if not self.dest_x509_ca_pem:
               raise errors.OpPrereqError("Missing destination X509 CA",
                                          errors.ECODE_INVAL)
         def ExpandNames(self):
           self._ExpandAndLockInstance()
           # Lock all nodes for local exports
           if self.op.mode == constants.EXPORT_MODE_LOCAL:
             # FIXME: lock only instance primary and destination node
+            #
             # Sad but true, for now we have do lock all nodes, as we don't know where
             # the previous export might be, and in this LU we search for it and
             # remove it from its current node. In the future we could fix this by:
             #  - making a tasklet to search (share-lock all), then create the
             #    new one, then one to remove, after
             #  - removing the removal operation altogether
             self.needed_locks[locking.LEVEL_NODE] = locking.ALL_SET
         def DeclareLocks(self, level):
           """Last minute lock declaration."""
           # All nodes are locked anyway, so nothing to do here.
         def BuildHooksEnv(self):
           """Build hooks env.
           This will run on the master, primary node and target node.
           """
           env = {
             "EXPORT_MODE": self.op.mode,
             "EXPORT_NODE": self.op.target_node,
             "EXPORT_DO_SHUTDOWN": self.op.shutdown,
             "SHUTDOWN_TIMEOUT": self.op.shutdown_timeout,
             # TODO: Generic function for boolean env variables
             "REMOVE_INSTANCE": str(bool(self.op.remove_instance)),
+            }
           env.update(_BuildInstanceHookEnvByObject(self, self.instance))
           return env
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           nl = [self.cfg.GetMasterNode(), self.instance.primary_node]
           if self.op.mode == constants.EXPORT_MODE_LOCAL:
             nl.append(self.op.target_node)
           return (nl, nl)
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the instance and node names are valid.
           """
           instance_name = self.op.instance_name
           self.instance = self.cfg.GetInstanceInfo(instance_name)
           assert self.instance is not None, \
                 "Cannot retrieve locked instance %s" % self.op.instance_name
           _CheckNodeOnline(self, self.instance.primary_node)
           if (self.op.remove_instance and
               self.instance.admin_state == constants.ADMINST_UP and
               not self.op.shutdown):
             raise errors.OpPrereqError("Can not remove instance without shutting it"
                                        " down before")
           if self.op.mode == constants.EXPORT_MODE_LOCAL:
             self.op.target_node = _ExpandNodeName(self.cfg, self.op.target_node)
             self.dst_node = self.cfg.GetNodeInfo(self.op.target_node)
             assert self.dst_node is not None
             _CheckNodeOnline(self, self.dst_node.name)
             _CheckNodeNotDrained(self, self.dst_node.name)
             self._cds = None
             self.dest_disk_info = None
             self.dest_x509_ca = None
           elif self.op.mode == constants.EXPORT_MODE_REMOTE:
             self.dst_node = None
             if len(self.op.target_node) != len(self.instance.disks):
               raise errors.OpPrereqError(("Received destination information for %s"
                                           " disks, but instance %s has %s disks") %
                                          (len(self.op.target_node), instance_name,
                                           len(self.instance.disks)),
                                          errors.ECODE_INVAL)
             cds = _GetClusterDomainSecret()
             # Check X509 key name
             try:
               (key_name, hmac_digest, hmac_salt) = self.x509_key_name
             except (TypeError, ValueError), err:
               raise errors.OpPrereqError("Invalid data for X509 key name: %s" % err)
             if not utils.VerifySha1Hmac(cds, key_name, hmac_digest, salt=hmac_salt):
               raise errors.OpPrereqError("HMAC for X509 key name is wrong",
                                          errors.ECODE_INVAL)
             # Load and verify CA
             try:
               (cert, _) = utils.LoadSignedX509Certificate(self.dest_x509_ca_pem, cds)
             except OpenSSL.crypto.Error, err:
               raise errors.OpPrereqError("Unable to load destination X509 CA (%s)" %
                                          (err, ), errors.ECODE_INVAL)
             (errcode, msg) = utils.VerifyX509Certificate(cert, None, None)
             if errcode is not None:
               raise errors.OpPrereqError("Invalid destination X509 CA (%s)" %
                                          (msg, ), errors.ECODE_INVAL)
             self.dest_x509_ca = cert
             # Verify target information
             disk_info = []
             for idx, disk_data in enumerate(self.op.target_node):
               try:
                 (host, port, magic) = \
                   masterd.instance.CheckRemoteExportDiskInfo(cds, idx, disk_data)
               except errors.GenericError, err:
                 raise errors.OpPrereqError("Target info for disk %s: %s" %
                                            (idx, err), errors.ECODE_INVAL)
               disk_info.append((host, port, magic))
             assert len(disk_info) == len(self.op.target_node)
             self.dest_disk_info = disk_info
           else:
             raise errors.ProgrammerError("Unhandled export mode %r" %
                                          self.op.mode)
           # instance disk type verification
           # TODO: Implement export support for file-based disks
           for disk in self.instance.disks:
             if disk.dev_type == constants.LD_FILE:
               raise errors.OpPrereqError("Export not supported for instances with"
                                          " file-based disks", errors.ECODE_INVAL)
         def _CleanupExports(self, feedback_fn):
           """Removes exports of current instance from all other nodes.
           If an instance in a cluster with nodes A..D was exported to node C, its
           exports will be removed from the nodes A, B and D.
           """
           assert self.op.mode != constants.EXPORT_MODE_REMOTE
           nodelist = self.cfg.GetNodeList()
           nodelist.remove(self.dst_node.name)
           # on one-node clusters nodelist will be empty after the removal
           # if we proceed the backup would be removed because OpBackupQuery
           # substitutes an empty list with the full cluster node list.
           iname = self.instance.name
           if nodelist:
             feedback_fn("Removing old exports for instance %s" % iname)
             exportlist = self.rpc.call_export_list(nodelist)
             for node in exportlist:
               if exportlist[node].fail_msg:
                 continue
               if iname in exportlist[node].payload:
                 msg = self.rpc.call_export_remove(node, iname).fail_msg
                 if msg:
                   self.LogWarning("Could not remove older export for instance %s"
                                   " on node %s: %s", iname, node, msg)
         def Exec(self, feedback_fn):
           """Export an instance to an image in the cluster.
           """
           assert self.op.mode in constants.EXPORT_MODES
           instance = self.instance
           src_node = instance.primary_node
           if self.op.shutdown:
             # shutdown the instance, but not the disks
             feedback_fn("Shutting down instance %s" % instance.name)
             result = self.rpc.call_instance_shutdown(src_node, instance,
                                                      self.op.shutdown_timeout)
             # TODO: Maybe ignore failures if ignore_remove_failures is set
             result.Raise("Could not shutdown instance %s on"
                          " node %s" % (instance.name, src_node))
           # set the disks ID correctly since call_instance_start needs the
           # correct drbd minor to create the symlinks
           for disk in instance.disks:
             self.cfg.SetDiskID(disk, src_node)
           activate_disks = (instance.admin_state != constants.ADMINST_UP)
           if activate_disks:
             # Activate the instance disks if we'exporting a stopped instance
             feedback_fn("Activating disks for %s" % instance.name)
             _StartInstanceDisks(self, instance, None)
           try:
             helper = masterd.instance.ExportInstanceHelper(self, feedback_fn,
                                                            instance)
             helper.CreateSnapshots()
             try:
               if (self.op.shutdown and
                   instance.admin_state == constants.ADMINST_UP and
                   not self.op.remove_instance):
                 assert not activate_disks
                 feedback_fn("Starting instance %s" % instance.name)
                 result = self.rpc.call_instance_start(src_node,
                                                       (instance, None, None), False)
                 msg = result.fail_msg
                 if msg:
                   feedback_fn("Failed to start instance: %s" % msg)
                   _ShutdownInstanceDisks(self, instance)
                   raise errors.OpExecError("Could not start instance: %s" % msg)
               if self.op.mode == constants.EXPORT_MODE_LOCAL:
                 (fin_resu, dresults) = helper.LocalExport(self.dst_node)
               elif self.op.mode == constants.EXPORT_MODE_REMOTE:
                 connect_timeout = constants.RIE_CONNECT_TIMEOUT
                 timeouts = masterd.instance.ImportExportTimeouts(connect_timeout)
                 (key_name, _, _) = self.x509_key_name
                 dest_ca_pem = \
                   OpenSSL.crypto.dump_certificate(OpenSSL.crypto.FILETYPE_PEM,
                                                   self.dest_x509_ca)
                 (fin_resu, dresults) = helper.RemoteExport(self.dest_disk_info,
                                                            key_name, dest_ca_pem,
                                                            timeouts)
             finally:
               helper.Cleanup()
             # Check for backwards compatibility
             assert len(dresults) == len(instance.disks)
             assert compat.all(isinstance(i, bool) for i in dresults), \
                    "Not all results are boolean: %r" % dresults
           finally:
             if activate_disks:
               feedback_fn("Deactivating disks for %s" % instance.name)
               _ShutdownInstanceDisks(self, instance)
           if not (compat.all(dresults) and fin_resu):
             failures = []
             if not fin_resu:
               failures.append("export finalization")
             if not compat.all(dresults):
               fdsk = utils.CommaJoin(idx for (idx, dsk) in enumerate(dresults)
                                      if not dsk)
               failures.append("disk export: disk(s) %s" % fdsk)
             raise errors.OpExecError("Export failed, errors in %s" %
                                      utils.CommaJoin(failures))
           # At this point, the export was successful, we can cleanup/finish
           # Remove instance if requested
           if self.op.remove_instance:
             feedback_fn("Removing instance %s" % instance.name)
             _RemoveInstance(self, feedback_fn, instance,
                             self.op.ignore_remove_failures)
           if self.op.mode == constants.EXPORT_MODE_LOCAL:
             self._CleanupExports(feedback_fn)
           return fin_resu, dresults
       class LUBackupRemove(NoHooksLU):
         """Remove exports related to the named instance.
         """
         REQ_BGL = False
         def ExpandNames(self):
           self.needed_locks = {}
           # We need all nodes to be locked in order for RemoveExport to work, but we
           # don't need to lock the instance itself, as nothing will happen to it (and
           # we can remove exports also for a removed instance)
           self.needed_locks[locking.LEVEL_NODE] = locking.ALL_SET
         def Exec(self, feedback_fn):
           """Remove any export.
           """
           instance_name = self.cfg.ExpandInstanceName(self.op.instance_name)
           # If the instance was not found we'll try with the name that was passed in.
           # This will only work if it was an FQDN, though.
           fqdn_warn = False
           if not instance_name:
             fqdn_warn = True
             instance_name = self.op.instance_name
           locked_nodes = self.owned_locks(locking.LEVEL_NODE)
           exportlist = self.rpc.call_export_list(locked_nodes)
           found = False
           for node in exportlist:
             msg = exportlist[node].fail_msg
             if msg:
               self.LogWarning("Failed to query node %s (continuing): %s", node, msg)
               continue
             if instance_name in exportlist[node].payload:
               found = True
               result = self.rpc.call_export_remove(node, instance_name)
               msg = result.fail_msg
               if msg:
                 logging.error("Could not remove export for instance %s"
                               " on node %s: %s", instance_name, node, msg)
           if fqdn_warn and not found:
             feedback_fn("Export not found. If trying to remove an export belonging"
                         " to a deleted instance please use its Fully Qualified"
                         " Domain Name.")
       class LUGroupAdd(LogicalUnit):
         """Logical unit for creating node groups.
         """
         HPATH = "group-add"
         HTYPE = constants.HTYPE_GROUP
         REQ_BGL = False
         def ExpandNames(self):
           # We need the new group's UUID here so that we can create and acquire the
           # corresponding lock. Later, in Exec(), we'll indicate to cfg.AddNodeGroup
           # that it should not check whether the UUID exists in the configuration.
           self.group_uuid = self.cfg.GenerateUniqueID(self.proc.GetECId())
           self.needed_locks = {}
           self.add_locks[locking.LEVEL_NODEGROUP] = self.group_uuid
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the given group name is not an existing node group
           already.
           """
           try:
             existing_uuid = self.cfg.LookupNodeGroup(self.op.group_name)
           except errors.OpPrereqError:
             pass
           else:
             raise errors.OpPrereqError("Desired group name '%s' already exists as a"
                                        " node group (UUID: %s)" %
                                        (self.op.group_name, existing_uuid),
                                        errors.ECODE_EXISTS)
           if self.op.ndparams:
             utils.ForceDictType(self.op.ndparams, constants.NDS_PARAMETER_TYPES)
           if self.op.diskparams:
             for templ in constants.DISK_TEMPLATES:
               if templ not in self.op.diskparams:
                 self.op.diskparams[templ] = {}
               utils.ForceDictType(self.op.diskparams[templ], constants.DISK_DT_TYPES)
           else:
             self.op.diskparams = self.cfg.GetClusterInfo().diskparams
         def BuildHooksEnv(self):
           """Build hooks env.
           """
           return {
             "GROUP_NAME": self.op.group_name,
+            }
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           mn = self.cfg.GetMasterNode()
           return ([mn], [mn])
         def Exec(self, feedback_fn):
           """Add the node group to the cluster.
           """
           group_obj = objects.NodeGroup(name=self.op.group_name, members=[],
                                         uuid=self.group_uuid,
                                         alloc_policy=self.op.alloc_policy,
                                         ndparams=self.op.ndparams,
                                         diskparams=self.op.diskparams)
           self.cfg.AddNodeGroup(group_obj, self.proc.GetECId(), check_uuid=False)
           del self.remove_locks[locking.LEVEL_NODEGROUP]
       class LUGroupAssignNodes(NoHooksLU):
         """Logical unit for assigning nodes to groups.
         """
         REQ_BGL = False
         def ExpandNames(self):
           # These raise errors.OpPrereqError on their own:
           self.group_uuid = self.cfg.LookupNodeGroup(self.op.group_name)
           self.op.nodes = _GetWantedNodes(self, self.op.nodes)
           # We want to lock all the affected nodes and groups. We have readily
           # available the list of nodes, and the *destination* group. To gather the
           # list of "source" groups, we need to fetch node information later on.
           self.needed_locks = {
             locking.LEVEL_NODEGROUP: set([self.group_uuid]),
             locking.LEVEL_NODE: self.op.nodes,
+            }
         def DeclareLocks(self, level):
           if level == locking.LEVEL_NODEGROUP:
             assert len(self.needed_locks[locking.LEVEL_NODEGROUP]) == 1
             # Try to get all affected nodes' groups without having the group or node
             # lock yet. Needs verification later in the code flow.
             groups = self.cfg.GetNodeGroupsFromNodes(self.op.nodes)
             self.needed_locks[locking.LEVEL_NODEGROUP].update(groups)
         def CheckPrereq(self):
           """Check prerequisites.
           """
           assert self.needed_locks[locking.LEVEL_NODEGROUP]
           assert (frozenset(self.owned_locks(locking.LEVEL_NODE)) ==
                   frozenset(self.op.nodes))
           expected_locks = (set([self.group_uuid]) |
                             self.cfg.GetNodeGroupsFromNodes(self.op.nodes))
           actual_locks = self.owned_locks(locking.LEVEL_NODEGROUP)
           if actual_locks != expected_locks:
             raise errors.OpExecError("Nodes changed groups since locks were acquired,"
                                      " current groups are '%s', used to be '%s'" %
                                      (utils.CommaJoin(expected_locks),
                                       utils.CommaJoin(actual_locks)))
           self.node_data = self.cfg.GetAllNodesInfo()
           self.group = self.cfg.GetNodeGroup(self.group_uuid)
           instance_data = self.cfg.GetAllInstancesInfo()
           if self.group is None:
             raise errors.OpExecError("Could not retrieve group '%s' (UUID: %s)" %
                                      (self.op.group_name, self.group_uuid))
           (new_splits, previous_splits) = \
             self.CheckAssignmentForSplitInstances([(node, self.group_uuid)
                                                    for node in self.op.nodes],
                                                   self.node_data, instance_data)
           if new_splits:
             fmt_new_splits = utils.CommaJoin(utils.NiceSort(new_splits))
             if not self.op.force:
               raise errors.OpExecError("The following instances get split by this"
                                        " change and --force was not given: %s" %
                                        fmt_new_splits)
             else:
               self.LogWarning("This operation will split the following instances: %s",
                               fmt_new_splits)
               if previous_splits:
                 self.LogWarning("In addition, these already-split instances continue"
                                 " to be split across groups: %s",
                                 utils.CommaJoin(utils.NiceSort(previous_splits)))
         def Exec(self, feedback_fn):
           """Assign nodes to a new group.
           """
           mods = [(node_name, self.group_uuid) for node_name in self.op.nodes]
           self.cfg.AssignGroupNodes(mods)
         @staticmethod
         def CheckAssignmentForSplitInstances(changes, node_data, instance_data):
           """Check for split instances after a node assignment.
           This method considers a series of node assignments as an atomic operation,
           and returns information about split instances after applying the set of
           changes.
           In particular, it returns information about newly split instances, and
           instances that were already split, and remain so after the change.
           Only instances whose disk template is listed in constants.DTS_INT_MIRROR are
           considered.
           @type changes: list of (node_name, new_group_uuid) pairs.
           @param changes: list of node assignments to consider.
           @param node_data: a dict with data for all nodes
           @param instance_data: a dict with all instances to consider
           @rtype: a two-tuple
           @return: a list of instances that were previously okay and result split as a
             consequence of this change, and a list of instances that were previously
             split and this change does not fix.
           """
           changed_nodes = dict((node, group) for node, group in changes
                                if node_data[node].group != group)
           all_split_instances = set()
           previously_split_instances = set()
           def InstanceNodes(instance):
             return [instance.primary_node] + list(instance.secondary_nodes)
           for inst in instance_data.values():
             if inst.disk_template not in constants.DTS_INT_MIRROR:
               continue
             instance_nodes = InstanceNodes(inst)
             if len(set(node_data[node].group for node in instance_nodes)) > 1:
               previously_split_instances.add(inst.name)
             if len(set(changed_nodes.get(node, node_data[node].group)
                        for node in instance_nodes)) > 1:
               all_split_instances.add(inst.name)
           return (list(all_split_instances - previously_split_instances),
                   list(previously_split_instances & all_split_instances))
       class _GroupQuery(_QueryBase):
         FIELDS = query.GROUP_FIELDS
         def ExpandNames(self, lu):
           lu.needed_locks = {}
           self._all_groups = lu.cfg.GetAllNodeGroupsInfo()
           name_to_uuid = dict((g.name, g.uuid) for g in self._all_groups.values())
           if not self.names:
             self.wanted = [name_to_uuid[name]
                            for name in utils.NiceSort(name_to_uuid.keys())]
           else:
             # Accept names to be either names or UUIDs.
             missing = []
             self.wanted = []
             all_uuid = frozenset(self._all_groups.keys())
             for name in self.names:
               if name in all_uuid:
                 self.wanted.append(name)
               elif name in name_to_uuid:
                 self.wanted.append(name_to_uuid[name])
               else:
                 missing.append(name)
             if missing:
               raise errors.OpPrereqError("Some groups do not exist: %s" %
                                          utils.CommaJoin(missing),
                                          errors.ECODE_NOENT)
         def DeclareLocks(self, lu, level):
           pass
         def _GetQueryData(self, lu):
           """Computes the list of node groups and their attributes.
           """
           do_nodes = query.GQ_NODE in self.requested_data
           do_instances = query.GQ_INST in self.requested_data
           group_to_nodes = None
           group_to_instances = None
           # For GQ_NODE, we need to map group->[nodes], and group->[instances] for
           # GQ_INST. The former is attainable with just GetAllNodesInfo(), but for the
           # latter GetAllInstancesInfo() is not enough, for we have to go through
           # instance->node. Hence, we will need to process nodes even if we only need
           # instance information.
           if do_nodes or do_instances:
             all_nodes = lu.cfg.GetAllNodesInfo()
             group_to_nodes = dict((uuid, []) for uuid in self.wanted)
             node_to_group = {}
             for node in all_nodes.values():
               if node.group in group_to_nodes:
                 group_to_nodes[node.group].append(node.name)
                 node_to_group[node.name] = node.group
             if do_instances:
               all_instances = lu.cfg.GetAllInstancesInfo()
               group_to_instances = dict((uuid, []) for uuid in self.wanted)
               for instance in all_instances.values():
                 node = instance.primary_node
                 if node in node_to_group:
                   group_to_instances[node_to_group[node]].append(instance.name)
               if not do_nodes:
                 # Do not pass on node information if it was not requested.
                 group_to_nodes = None
           return query.GroupQueryData([self._all_groups[uuid]
                                        for uuid in self.wanted],
                                       group_to_nodes, group_to_instances)
       class LUGroupQuery(NoHooksLU):
         """Logical unit for querying node groups.
         """
         REQ_BGL = False
         def CheckArguments(self):
           self.gq = _GroupQuery(qlang.MakeSimpleFilter("name", self.op.names),
                                 self.op.output_fields, False)
         def ExpandNames(self):
           self.gq.ExpandNames(self)
         def DeclareLocks(self, level):
           self.gq.DeclareLocks(self, level)
         def Exec(self, feedback_fn):
           return self.gq.OldStyleQuery(self)
       class LUGroupSetParams(LogicalUnit):
         """Modifies the parameters of a node group.
         """
         HPATH = "group-modify"
         HTYPE = constants.HTYPE_GROUP
         REQ_BGL = False
         def CheckArguments(self):
           all_changes = [
             self.op.ndparams,
             self.op.diskparams,
             self.op.alloc_policy,
+            ]
           if all_changes.count(None) == len(all_changes):
             raise errors.OpPrereqError("Please pass at least one modification",
                                        errors.ECODE_INVAL)
         def ExpandNames(self):
           # This raises errors.OpPrereqError on its own:
           self.group_uuid = self.cfg.LookupNodeGroup(self.op.group_name)
           self.needed_locks = {
             locking.LEVEL_NODEGROUP: [self.group_uuid],
+            }
         def CheckPrereq(self):
           """Check prerequisites.
           """
           self.group = self.cfg.GetNodeGroup(self.group_uuid)
           if self.group is None:
             raise errors.OpExecError("Could not retrieve group '%s' (UUID: %s)" %
                                      (self.op.group_name, self.group_uuid))
           if self.op.ndparams:
             new_ndparams = _GetUpdatedParams(self.group.ndparams, self.op.ndparams)
             utils.ForceDictType(self.op.ndparams, constants.NDS_PARAMETER_TYPES)
             self.new_ndparams = new_ndparams
           if self.op.diskparams:
             self.new_diskparams = dict()
             for templ in constants.DISK_TEMPLATES:
               if templ not in self.op.diskparams:
                 self.op.diskparams[templ] = {}
               new_templ_params = _GetUpdatedParams(self.group.diskparams[templ],
                                                    self.op.diskparams[templ])
               utils.ForceDictType(new_templ_params, constants.DISK_DT_TYPES)
               self.new_diskparams[templ] = new_templ_params
         def BuildHooksEnv(self):
           """Build hooks env.
           """
           return {
             "GROUP_NAME": self.op.group_name,
             "NEW_ALLOC_POLICY": self.op.alloc_policy,
+            }
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           mn = self.cfg.GetMasterNode()
           return ([mn], [mn])
         def Exec(self, feedback_fn):
           """Modifies the node group.
           """
           result = []
           if self.op.ndparams:
             self.group.ndparams = self.new_ndparams
             result.append(("ndparams", str(self.group.ndparams)))
           if self.op.diskparams:
             self.group.diskparams = self.new_diskparams
             result.append(("diskparams", str(self.group.diskparams)))
           if self.op.alloc_policy:
             self.group.alloc_policy = self.op.alloc_policy
           self.cfg.Update(self.group, feedback_fn)
           return result
       class LUGroupRemove(LogicalUnit):
         HPATH = "group-remove"
         HTYPE = constants.HTYPE_GROUP
         REQ_BGL = False
         def ExpandNames(self):
           # This will raises errors.OpPrereqError on its own:
           self.group_uuid = self.cfg.LookupNodeGroup(self.op.group_name)
           self.needed_locks = {
             locking.LEVEL_NODEGROUP: [self.group_uuid],
+            }
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the given group name exists as a node group, that is
           empty (i.e., contains no nodes), and that is not the last group of the
           cluster.
           """
           # Verify that the group is empty.
           group_nodes = [node.name
                          for node in self.cfg.GetAllNodesInfo().values()
                          if node.group == self.group_uuid]
           if group_nodes:
             raise errors.OpPrereqError("Group '%s' not empty, has the following"
                                        " nodes: %s" %
                                        (self.op.group_name,
                                         utils.CommaJoin(utils.NiceSort(group_nodes))),
                                        errors.ECODE_STATE)
           # Verify the cluster would not be left group-less.
           if len(self.cfg.GetNodeGroupList()) == 1:
             raise errors.OpPrereqError("Group '%s' is the only group,"
                                        " cannot be removed" %
                                        self.op.group_name,
                                        errors.ECODE_STATE)
         def BuildHooksEnv(self):
           """Build hooks env.
           """
           return {
             "GROUP_NAME": self.op.group_name,
+            }
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           mn = self.cfg.GetMasterNode()
           return ([mn], [mn])
         def Exec(self, feedback_fn):
           """Remove the node group.
           """
           try:
             self.cfg.RemoveNodeGroup(self.group_uuid)
           except errors.ConfigurationError:
             raise errors.OpExecError("Group '%s' with UUID %s disappeared" %
                                      (self.op.group_name, self.group_uuid))
           self.remove_locks[locking.LEVEL_NODEGROUP] = self.group_uuid
       class LUGroupRename(LogicalUnit):
         HPATH = "group-rename"
         HTYPE = constants.HTYPE_GROUP
         REQ_BGL = False
         def ExpandNames(self):
           # This raises errors.OpPrereqError on its own:
           self.group_uuid = self.cfg.LookupNodeGroup(self.op.group_name)
           self.needed_locks = {
             locking.LEVEL_NODEGROUP: [self.group_uuid],
+            }
         def CheckPrereq(self):
           """Check prerequisites.
           Ensures requested new name is not yet used.
           """
           try:
             new_name_uuid = self.cfg.LookupNodeGroup(self.op.new_name)
           except errors.OpPrereqError:
             pass
           else:
             raise errors.OpPrereqError("Desired new name '%s' clashes with existing"
                                        " node group (UUID: %s)" %
                                        (self.op.new_name, new_name_uuid),
                                        errors.ECODE_EXISTS)
         def BuildHooksEnv(self):
           """Build hooks env.
           """
           return {
             "OLD_NAME": self.op.group_name,
             "NEW_NAME": self.op.new_name,
+            }
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           mn = self.cfg.GetMasterNode()
           all_nodes = self.cfg.GetAllNodesInfo()
           all_nodes.pop(mn, None)
           run_nodes = [mn]
           run_nodes.extend(node.name for node in all_nodes.values()
                            if node.group == self.group_uuid)
           return (run_nodes, run_nodes)
         def Exec(self, feedback_fn):
           """Rename the node group.
           """
           group = self.cfg.GetNodeGroup(self.group_uuid)
           if group is None:
             raise errors.OpExecError("Could not retrieve group '%s' (UUID: %s)" %
                                      (self.op.group_name, self.group_uuid))
           group.name = self.op.new_name
           self.cfg.Update(group, feedback_fn)
           return self.op.new_name
       class LUGroupEvacuate(LogicalUnit):
         HPATH = "group-evacuate"
         HTYPE = constants.HTYPE_GROUP
         REQ_BGL = False
         def ExpandNames(self):
           # This raises errors.OpPrereqError on its own:
           self.group_uuid = self.cfg.LookupNodeGroup(self.op.group_name)
           if self.op.target_groups:
             self.req_target_uuids = map(self.cfg.LookupNodeGroup,
                                         self.op.target_groups)
           else:
             self.req_target_uuids = []
           if self.group_uuid in self.req_target_uuids:
             raise errors.OpPrereqError("Group to be evacuated (%s) can not be used"
                                        " as a target group (targets are %s)" %
                                        (self.group_uuid,
                                         utils.CommaJoin(self.req_target_uuids)),
                                        errors.ECODE_INVAL)
           self.op.iallocator = _GetDefaultIAllocator(self.cfg, self.op.iallocator)
           self.share_locks = _ShareAll()
           self.needed_locks = {
             locking.LEVEL_INSTANCE: [],
             locking.LEVEL_NODEGROUP: [],
             locking.LEVEL_NODE: [],
+            }
         def DeclareLocks(self, level):
           if level == locking.LEVEL_INSTANCE:
             assert not self.needed_locks[locking.LEVEL_INSTANCE]
             # Lock instances optimistically, needs verification once node and group
             # locks have been acquired
             self.needed_locks[locking.LEVEL_INSTANCE] = \
               self.cfg.GetNodeGroupInstances(self.group_uuid)
           elif level == locking.LEVEL_NODEGROUP:
             assert not self.needed_locks[locking.LEVEL_NODEGROUP]
             if self.req_target_uuids:
               lock_groups = set([self.group_uuid] + self.req_target_uuids)
               # Lock all groups used by instances optimistically; this requires going
               # via the node before it's locked, requiring verification later on
               lock_groups.update(group_uuid
                                  for instance_name in
                                    self.owned_locks(locking.LEVEL_INSTANCE)
                                  for group_uuid in
                                    self.cfg.GetInstanceNodeGroups(instance_name))
             else:
               # No target groups, need to lock all of them
               lock_groups = locking.ALL_SET
             self.needed_locks[locking.LEVEL_NODEGROUP] = lock_groups
           elif level == locking.LEVEL_NODE:
             # This will only lock the nodes in the group to be evacuated which
             # contain actual instances
             self.recalculate_locks[locking.LEVEL_NODE] = constants.LOCKS_APPEND
             self._LockInstancesNodes()
             # Lock all nodes in group to be evacuated and target groups
             owned_groups = frozenset(self.owned_locks(locking.LEVEL_NODEGROUP))
             assert self.group_uuid in owned_groups
             member_nodes = [node_name
                             for group in owned_groups
                             for node_name in self.cfg.GetNodeGroup(group).members]
             self.needed_locks[locking.LEVEL_NODE].extend(member_nodes)
         def CheckPrereq(self):
           owned_instances = frozenset(self.owned_locks(locking.LEVEL_INSTANCE))
           owned_groups = frozenset(self.owned_locks(locking.LEVEL_NODEGROUP))
           owned_nodes = frozenset(self.owned_locks(locking.LEVEL_NODE))
           assert owned_groups.issuperset(self.req_target_uuids)
           assert self.group_uuid in owned_groups
           # Check if locked instances are still correct
           _CheckNodeGroupInstances(self.cfg, self.group_uuid, owned_instances)
           # Get instance information
           self.instances = dict(self.cfg.GetMultiInstanceInfo(owned_instances))
           # Check if node groups for locked instances are still correct
           for instance_name in owned_instances:
             inst = self.instances[instance_name]
             assert owned_nodes.issuperset(inst.all_nodes), \
               "Instance %s's nodes changed while we kept the lock" % instance_name
             inst_groups = _CheckInstanceNodeGroups(self.cfg, instance_name,
                                                    owned_groups)
             assert self.group_uuid in inst_groups, \
               "Instance %s has no node in group %s" % (instance_name, self.group_uuid)
           if self.req_target_uuids:
             # User requested specific target groups
             self.target_uuids = self.req_target_uuids
           else:
             # All groups except the one to be evacuated are potential targets
             self.target_uuids = [group_uuid for group_uuid in owned_groups
                                  if group_uuid != self.group_uuid]
             if not self.target_uuids:
               raise errors.OpPrereqError("There are no possible target groups",
                                          errors.ECODE_INVAL)
         def BuildHooksEnv(self):
           """Build hooks env.
           """
           return {
             "GROUP_NAME": self.op.group_name,
             "TARGET_GROUPS": " ".join(self.target_uuids),
+            }
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           mn = self.cfg.GetMasterNode()
           assert self.group_uuid in self.owned_locks(locking.LEVEL_NODEGROUP)
           run_nodes = [mn] + self.cfg.GetNodeGroup(self.group_uuid).members
           return (run_nodes, run_nodes)
         def Exec(self, feedback_fn):
           instances = list(self.owned_locks(locking.LEVEL_INSTANCE))
           assert self.group_uuid not in self.target_uuids
           ial = IAllocator(self.cfg, self.rpc, constants.IALLOCATOR_MODE_CHG_GROUP,
                            instances=instances, target_groups=self.target_uuids)
           ial.Run(self.op.iallocator)
           if not ial.success:
             raise errors.OpPrereqError("Can't compute group evacuation using"
                                        " iallocator '%s': %s" %
                                        (self.op.iallocator, ial.info),
                                        errors.ECODE_NORES)
           jobs = _LoadNodeEvacResult(self, ial.result, self.op.early_release, False)
           self.LogInfo("Iallocator returned %s job(s) for evacuating node group %s",
                        len(jobs), self.op.group_name)
           return ResultWithJobs(jobs)
       class TagsLU(NoHooksLU): # pylint: disable=W0223
         """Generic tags LU.
         This is an abstract class which is the parent of all the other tags LUs.
         """
         def ExpandNames(self):
           self.group_uuid = None
           self.needed_locks = {}
           if self.op.kind == constants.TAG_NODE:
             self.op.name = _ExpandNodeName(self.cfg, self.op.name)
             self.needed_locks[locking.LEVEL_NODE] = self.op.name
           elif self.op.kind == constants.TAG_INSTANCE:
             self.op.name = _ExpandInstanceName(self.cfg, self.op.name)
             self.needed_locks[locking.LEVEL_INSTANCE] = self.op.name
           elif self.op.kind == constants.TAG_NODEGROUP:
             self.group_uuid = self.cfg.LookupNodeGroup(self.op.name)
           # FIXME: Acquire BGL for cluster tag operations (as of this writing it's
           # not possible to acquire the BGL based on opcode parameters)
         def CheckPrereq(self):
           """Check prerequisites.
           """
           if self.op.kind == constants.TAG_CLUSTER:
             self.target = self.cfg.GetClusterInfo()
           elif self.op.kind == constants.TAG_NODE:
             self.target = self.cfg.GetNodeInfo(self.op.name)
           elif self.op.kind == constants.TAG_INSTANCE:
             self.target = self.cfg.GetInstanceInfo(self.op.name)
           elif self.op.kind == constants.TAG_NODEGROUP:
             self.target = self.cfg.GetNodeGroup(self.group_uuid)
           else:
             raise errors.OpPrereqError("Wrong tag type requested (%s)" %
                                        str(self.op.kind), errors.ECODE_INVAL)
       class LUTagsGet(TagsLU):
         """Returns the tags of a given object.
         """
         REQ_BGL = False
         def ExpandNames(self):
           TagsLU.ExpandNames(self)
           # Share locks as this is only a read operation
           self.share_locks = _ShareAll()
         def Exec(self, feedback_fn):
           """Returns the tag list.
           """
           return list(self.target.GetTags())
       class LUTagsSearch(NoHooksLU):
         """Searches the tags for a given pattern.
         """
         REQ_BGL = False
         def ExpandNames(self):
           self.needed_locks = {}
         def CheckPrereq(self):
           """Check prerequisites.
           This checks the pattern passed for validity by compiling it.
           """
           try:
             self.re = re.compile(self.op.pattern)
           except re.error, err:
             raise errors.OpPrereqError("Invalid search pattern '%s': %s" %
                                        (self.op.pattern, err), errors.ECODE_INVAL)
         def Exec(self, feedback_fn):
           """Returns the tag list.
           """
           cfg = self.cfg
           tgts = [("/cluster", cfg.GetClusterInfo())]
           ilist = cfg.GetAllInstancesInfo().values()
           tgts.extend([("/instances/%s" % i.name, i) for i in ilist])
           nlist = cfg.GetAllNodesInfo().values()
           tgts.extend([("/nodes/%s" % n.name, n) for n in nlist])
           tgts.extend(("/nodegroup/%s" % n.name, n)
                       for n in cfg.GetAllNodeGroupsInfo().values())
           results = []
           for path, target in tgts:
             for tag in target.GetTags():
               if self.re.search(tag):
                 results.append((path, tag))
           return results
       class LUTagsSet(TagsLU):
         """Sets a tag on a given object.
         """
         REQ_BGL = False
         def CheckPrereq(self):
           """Check prerequisites.
           This checks the type and length of the tag name and value.
           """
           TagsLU.CheckPrereq(self)
           for tag in self.op.tags:
             objects.TaggableObject.ValidateTag(tag)
         def Exec(self, feedback_fn):
           """Sets the tag.
           """
           try:
             for tag in self.op.tags:
               self.target.AddTag(tag)
           except errors.TagError, err:
             raise errors.OpExecError("Error while setting tag: %s" % str(err))
           self.cfg.Update(self.target, feedback_fn)
       class LUTagsDel(TagsLU):
         """Delete a list of tags from a given object.
         """
         REQ_BGL = False
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that we have the given tag.
           """
           TagsLU.CheckPrereq(self)
           for tag in self.op.tags:
             objects.TaggableObject.ValidateTag(tag)
           del_tags = frozenset(self.op.tags)
           cur_tags = self.target.GetTags()
           diff_tags = del_tags - cur_tags
           if diff_tags:
             diff_names = ("'%s'" % i for i in sorted(diff_tags))
             raise errors.OpPrereqError("Tag(s) %s not found" %
                                        (utils.CommaJoin(diff_names), ),
                                        errors.ECODE_NOENT)
         def Exec(self, feedback_fn):
           """Remove the tag from the object.
           """
           for tag in self.op.tags:
             self.target.RemoveTag(tag)
           self.cfg.Update(self.target, feedback_fn)
       class LUTestDelay(NoHooksLU):
         """Sleep for a specified amount of time.
         This LU sleeps on the master and/or nodes for a specified amount of
         time.
         """
         REQ_BGL = False
         def ExpandNames(self):
           """Expand names and set required locks.
           This expands the node list, if any.
           """
           self.needed_locks = {}
           if self.op.on_nodes:
             # _GetWantedNodes can be used here, but is not always appropriate to use
             # this way in ExpandNames. Check LogicalUnit.ExpandNames docstring for
             # more information.
             self.op.on_nodes = _GetWantedNodes(self, self.op.on_nodes)
             self.needed_locks[locking.LEVEL_NODE] = self.op.on_nodes
         def _TestDelay(self):
           """Do the actual sleep.
           """
           if self.op.on_master:
             if not utils.TestDelay(self.op.duration):
               raise errors.OpExecError("Error during master delay test")
           if self.op.on_nodes:
             result = self.rpc.call_test_delay(self.op.on_nodes, self.op.duration)
             for node, node_result in result.items():
               node_result.Raise("Failure during rpc call to node %s" % node)
         def Exec(self, feedback_fn):
           """Execute the test delay opcode, with the wanted repetitions.
           """
           if self.op.repeat == 0:
             self._TestDelay()
           else:
             top_value = self.op.repeat - 1
             for i in range(self.op.repeat):
               self.LogInfo("Test delay iteration %d/%d" % (i, top_value))
               self._TestDelay()
       class LUTestJqueue(NoHooksLU):
         """Utility LU to test some aspects of the job queue.
         """
         REQ_BGL = False
         # Must be lower than default timeout for WaitForJobChange to see whether it
         # notices changed jobs
         _CLIENT_CONNECT_TIMEOUT = 20.0
         _CLIENT_CONFIRM_TIMEOUT = 60.0
         @classmethod
         def _NotifyUsingSocket(cls, cb, errcls):
           """Opens a Unix socket and waits for another program to connect.
           @type cb: callable
           @param cb: Callback to send socket name to client
           @type errcls: class
           @param errcls: Exception class to use for errors
           """
           # Using a temporary directory as there's no easy way to create temporary
           # sockets without writing a custom loop around tempfile.mktemp and
           # socket.bind
           tmpdir = tempfile.mkdtemp()
           try:
             tmpsock = utils.PathJoin(tmpdir, "sock")
             logging.debug("Creating temporary socket at %s", tmpsock)
             sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
             try:
               sock.bind(tmpsock)
               sock.listen(1)
               # Send details to client
               cb(tmpsock)
               # Wait for client to connect before continuing
               sock.settimeout(cls._CLIENT_CONNECT_TIMEOUT)
               try:
                 (conn, _) = sock.accept()
               except socket.error, err:
                 raise errcls("Client didn't connect in time (%s)" % err)
             finally:
               sock.close()
           finally:
             # Remove as soon as client is connected
             shutil.rmtree(tmpdir)
           # Wait for client to close
           try:
             try:
               # pylint: disable=E1101
               # Instance of '_socketobject' has no ... member
               conn.settimeout(cls._CLIENT_CONFIRM_TIMEOUT)
               conn.recv(1)
             except socket.error, err:
               raise errcls("Client failed to confirm notification (%s)" % err)
           finally:
             conn.close()
         def _SendNotification(self, test, arg, sockname):
           """Sends a notification to the client.
           @type test: string
           @param test: Test name
           @param arg: Test argument (depends on test)
           @type sockname: string
           @param sockname: Socket path
           """
           self.Log(constants.ELOG_JQUEUE_TEST, (sockname, test, arg))
         def _Notify(self, prereq, test, arg):
           """Notifies the client of a test.
           @type prereq: bool
           @param prereq: Whether this is a prereq-phase test
           @type test: string
           @param test: Test name
           @param arg: Test argument (depends on test)
           """
           if prereq:
             errcls = errors.OpPrereqError
           else:
             errcls = errors.OpExecError
           return self._NotifyUsingSocket(compat.partial(self._SendNotification,
                                                         test, arg),
                                          errcls)
         def CheckArguments(self):
           self.checkargs_calls = getattr(self, "checkargs_calls", 0) + 1
           self.expandnames_calls = 0
         def ExpandNames(self):
           checkargs_calls = getattr(self, "checkargs_calls", 0)
           if checkargs_calls < 1:
             raise errors.ProgrammerError("CheckArguments was not called")
           self.expandnames_calls += 1
           if self.op.notify_waitlock:
             self._Notify(True, constants.JQT_EXPANDNAMES, None)
           self.LogInfo("Expanding names")
           # Get lock on master node (just to get a lock, not for a particular reason)
           self.needed_locks = {
             locking.LEVEL_NODE: self.cfg.GetMasterNode(),
+            }
         def Exec(self, feedback_fn):
           if self.expandnames_calls < 1:
             raise errors.ProgrammerError("ExpandNames was not called")
           if self.op.notify_exec:
             self._Notify(False, constants.JQT_EXEC, None)
           self.LogInfo("Executing")
           if self.op.log_messages:
             self._Notify(False, constants.JQT_STARTMSG, len(self.op.log_messages))
             for idx, msg in enumerate(self.op.log_messages):
               self.LogInfo("Sending log message %s", idx + 1)
               feedback_fn(constants.JQT_MSGPREFIX + msg)
               # Report how many test messages have been sent
               self._Notify(False, constants.JQT_LOGMSG, idx + 1)
           if self.op.fail:
             raise errors.OpExecError("Opcode failure was requested")
           return True
       class IAllocator(object):
         """IAllocator framework.
         An IAllocator instance has three sets of attributes:
           - cfg that is needed to query the cluster
           - input data (all members of the _KEYS class attribute are required)
           - four buffer attributes (in|out_data|text), that represent the
             input (to the external script) in text and data structure format,
             and the output from it, again in two formats
           - the result variables from the script (success, info, nodes) for
             easy usage
         """
         # pylint: disable=R0902
         # lots of instance attributes
         def __init__(self, cfg, rpc_runner, mode, **kwargs):
           self.cfg = cfg
           self.rpc = rpc_runner
           # init buffer variables
           self.in_text = self.out_text = self.in_data = self.out_data = None
           # init all input fields so that pylint is happy
           self.mode = mode
           self.memory = self.disks = self.disk_template = None
           self.os = self.tags = self.nics = self.vcpus = None
           self.hypervisor = None
           self.relocate_from = None
           self.name = None
           self.instances = None
           self.evac_mode = None
           self.target_groups = []
           # computed fields
           self.required_nodes = None
           # init result fields
           self.success = self.info = self.result = None
           try:
             (fn, keydata, self._result_check) = self._MODE_DATA[self.mode]
           except KeyError:
             raise errors.ProgrammerError("Unknown mode '%s' passed to the"
                                          " IAllocator" % self.mode)
           keyset = [n for (n, _) in keydata]
           for key in kwargs:
             if key not in keyset:
               raise errors.ProgrammerError("Invalid input parameter '%s' to"
                                            " IAllocator" % key)
             setattr(self, key, kwargs[key])
           for key in keyset:
             if key not in kwargs:
               raise errors.ProgrammerError("Missing input parameter '%s' to"
                                            " IAllocator" % key)
           self._BuildInputData(compat.partial(fn, self), keydata)
         def _ComputeClusterData(self):
           """Compute the generic allocator input data.
           This is the data that is independent of the actual operation.
           """
           cfg = self.cfg
           cluster_info = cfg.GetClusterInfo()
           # cluster data
           data = {
             "version": constants.IALLOCATOR_VERSION,
             "cluster_name": cfg.GetClusterName(),
             "cluster_tags": list(cluster_info.GetTags()),
             "enabled_hypervisors": list(cluster_info.enabled_hypervisors),
             # we don't have job IDs
+            }
           ninfo = cfg.GetAllNodesInfo()
           iinfo = cfg.GetAllInstancesInfo().values()
           i_list = [(inst, cluster_info.FillBE(inst)) for inst in iinfo]
           # node data
           node_list = [n.name for n in ninfo.values() if n.vm_capable]
           if self.mode == constants.IALLOCATOR_MODE_ALLOC:
             hypervisor_name = self.hypervisor
           elif self.mode == constants.IALLOCATOR_MODE_RELOC:
             hypervisor_name = cfg.GetInstanceInfo(self.name).hypervisor
           else:
             hypervisor_name = cluster_info.primary_hypervisor
           node_data = self.rpc.call_node_info(node_list, [cfg.GetVGName()],
                                               [hypervisor_name])
           node_iinfo = \
             self.rpc.call_all_instances_info(node_list,
                                              cluster_info.enabled_hypervisors)
           data["nodegroups"] = self._ComputeNodeGroupData(cfg)
           config_ndata = self._ComputeBasicNodeData(ninfo)
           data["nodes"] = self._ComputeDynamicNodeData(ninfo, node_data, node_iinfo,
                                                        i_list, config_ndata)
           assert len(data["nodes"]) == len(ninfo), \
               "Incomplete node data computed"
           data["instances"] = self._ComputeInstanceData(cluster_info, i_list)
           self.in_data = data
         @staticmethod
         def _ComputeNodeGroupData(cfg):
           """Compute node groups data.
           """
           ng = dict((guuid, {
             "name": gdata.name,
             "alloc_policy": gdata.alloc_policy,
             })
             for guuid, gdata in cfg.GetAllNodeGroupsInfo().items())
           return ng
         @staticmethod
         def _ComputeBasicNodeData(node_cfg):
           """Compute global node data.
           @rtype: dict
           @returns: a dict of name: (node dict, node config)
           """
           # fill in static (config-based) values
           node_results = dict((ninfo.name, {
             "tags": list(ninfo.GetTags()),
             "primary_ip": ninfo.primary_ip,
             "secondary_ip": ninfo.secondary_ip,
             "offline": ninfo.offline,
             "drained": ninfo.drained,
             "master_candidate": ninfo.master_candidate,
             "group": ninfo.group,
             "master_capable": ninfo.master_capable,
             "vm_capable": ninfo.vm_capable,
             })
             for ninfo in node_cfg.values())
           return node_results
         @staticmethod
         def _ComputeDynamicNodeData(node_cfg, node_data, node_iinfo, i_list,
                                     node_results):
           """Compute global node data.
           @param node_results: the basic node structures as filled from the config
           """
           #TODO(dynmem): compute the right data on MAX and MIN memory
           # make a copy of the current dict
           node_results = dict(node_results)
           for nname, nresult in node_data.items():
             assert nname in node_results, "Missing basic data for node %s" % nname
             ninfo = node_cfg[nname]
             if not (ninfo.offline or ninfo.drained):
               nresult.Raise("Can't get data for node %s" % nname)
               node_iinfo[nname].Raise("Can't get node instance info from node %s" %
                                       nname)
               remote_info = _MakeLegacyNodeInfo(nresult.payload)
               for attr in ["memory_total", "memory_free", "memory_dom0",
                            "vg_size", "vg_free", "cpu_total"]:
                 if attr not in remote_info:
                   raise errors.OpExecError("Node '%s' didn't return attribute"
                                            " '%s'" % (nname, attr))
                 if not isinstance(remote_info[attr], int):
                   raise errors.OpExecError("Node '%s' returned invalid value"
                                            " for '%s': %s" %
                                            (nname, attr, remote_info[attr]))
               # compute memory used by primary instances
               i_p_mem = i_p_up_mem = 0
               for iinfo, beinfo in i_list:
                 if iinfo.primary_node == nname:
                   i_p_mem += beinfo[constants.BE_MAXMEM]
                   if iinfo.name not in node_iinfo[nname].payload:
                     i_used_mem = 0
                   else:
                     i_used_mem = int(node_iinfo[nname].payload[iinfo.name]["memory"])
                   i_mem_diff = beinfo[constants.BE_MAXMEM] - i_used_mem
                   remote_info["memory_free"] -= max(0, i_mem_diff)
                   if iinfo.admin_state == constants.ADMINST_UP:
                     i_p_up_mem += beinfo[constants.BE_MAXMEM]
               # compute memory used by instances
               pnr_dyn = {
                 "total_memory": remote_info["memory_total"],
                 "reserved_memory": remote_info["memory_dom0"],
                 "free_memory": remote_info["memory_free"],
                 "total_disk": remote_info["vg_size"],
                 "free_disk": remote_info["vg_free"],
                 "total_cpus": remote_info["cpu_total"],
                 "i_pri_memory": i_p_mem,
                 "i_pri_up_memory": i_p_up_mem,
+                }
               pnr_dyn.update(node_results[nname])
               node_results[nname] = pnr_dyn
           return node_results
         @staticmethod
         def _ComputeInstanceData(cluster_info, i_list):
           """Compute global instance data.
           """
           instance_data = {}
           for iinfo, beinfo in i_list:
             nic_data = []
             for nic in iinfo.nics:
               filled_params = cluster_info.SimpleFillNIC(nic.nicparams)
               nic_dict = {
                 "mac": nic.mac,
                 "ip": nic.ip,
                 "mode": filled_params[constants.NIC_MODE],
                 "link": filled_params[constants.NIC_LINK],
+                }
               if filled_params[constants.NIC_MODE] == constants.NIC_MODE_BRIDGED:
                 nic_dict["bridge"] = filled_params[constants.NIC_LINK]
               nic_data.append(nic_dict)
             pir = {
               "tags": list(iinfo.GetTags()),
               "admin_state": iinfo.admin_state,
               "vcpus": beinfo[constants.BE_VCPUS],
               "memory": beinfo[constants.BE_MAXMEM],
               "os": iinfo.os,
               "nodes": [iinfo.primary_node] + list(iinfo.secondary_nodes),
               "nics": nic_data,
               "disks": [{constants.IDISK_SIZE: dsk.size,
                          constants.IDISK_MODE: dsk.mode}
                         for dsk in iinfo.disks],
               "disk_template": iinfo.disk_template,
               "hypervisor": iinfo.hypervisor,
+              }
             pir["disk_space_total"] = _ComputeDiskSize(iinfo.disk_template,
                                                        pir["disks"])
             instance_data[iinfo.name] = pir
           return instance_data
         def _AddNewInstance(self):
           """Add new instance data to allocator structure.
           This in combination with _AllocatorGetClusterData will create the
           correct structure needed as input for the allocator.
           The checks for the completeness of the opcode must have already been
           done.
           """
           disk_space = _ComputeDiskSize(self.disk_template, self.disks)
           if self.disk_template in constants.DTS_INT_MIRROR:
             self.required_nodes = 2
           else:
             self.required_nodes = 1
           request = {
             "name": self.name,
             "disk_template": self.disk_template,
             "tags": self.tags,
             "os": self.os,
             "vcpus": self.vcpus,
             "memory": self.memory,
             "disks": self.disks,
             "disk_space_total": disk_space,
             "nics": self.nics,
             "required_nodes": self.required_nodes,
             "hypervisor": self.hypervisor,
+            }
           return request
         def _AddRelocateInstance(self):
           """Add relocate instance data to allocator structure.
           This in combination with _IAllocatorGetClusterData will create the
           correct structure needed as input for the allocator.
           The checks for the completeness of the opcode must have already been
           done.
           """
           instance = self.cfg.GetInstanceInfo(self.name)
           if instance is None:
             raise errors.ProgrammerError("Unknown instance '%s' passed to"
                                          " IAllocator" % self.name)
           if instance.disk_template not in constants.DTS_MIRRORED:
             raise errors.OpPrereqError("Can't relocate non-mirrored instances",
                                        errors.ECODE_INVAL)
           if instance.disk_template in constants.DTS_INT_MIRROR and \
               len(instance.secondary_nodes) != 1:
             raise errors.OpPrereqError("Instance has not exactly one secondary node",
                                        errors.ECODE_STATE)
           self.required_nodes = 1
           disk_sizes = [{constants.IDISK_SIZE: disk.size} for disk in instance.disks]
           disk_space = _ComputeDiskSize(instance.disk_template, disk_sizes)
           request = {
             "name": self.name,
             "disk_space_total": disk_space,
             "required_nodes": self.required_nodes,
             "relocate_from": self.relocate_from,
+            }
           return request
         def _AddNodeEvacuate(self):
           """Get data for node-evacuate requests.
           """
           return {
             "instances": self.instances,
             "evac_mode": self.evac_mode,
+            }
         def _AddChangeGroup(self):
           """Get data for node-evacuate requests.
           """
           return {
             "instances": self.instances,
             "target_groups": self.target_groups,
+            }
         def _BuildInputData(self, fn, keydata):
           """Build input data structures.
           """
           self._ComputeClusterData()
           request = fn()
           request["type"] = self.mode
           for keyname, keytype in keydata:
             if keyname not in request:
               raise errors.ProgrammerError("Request parameter %s is missing" %
                                            keyname)
             val = request[keyname]
             if not keytype(val):
               raise errors.ProgrammerError("Request parameter %s doesn't pass"
                                            " validation, value %s, expected"
                                            " type %s" % (keyname, val, keytype))
           self.in_data["request"] = request
           self.in_text = serializer.Dump(self.in_data)
         _STRING_LIST = ht.TListOf(ht.TString)
         _JOB_LIST = ht.TListOf(ht.TListOf(ht.TStrictDict(True, False, {
            # pylint: disable=E1101
            # Class '...' has no 'OP_ID' member
            "OP_ID": ht.TElemOf([opcodes.OpInstanceFailover.OP_ID,
                                 opcodes.OpInstanceMigrate.OP_ID,
                                 opcodes.OpInstanceReplaceDisks.OP_ID])
            })))
         _NEVAC_MOVED = \
           ht.TListOf(ht.TAnd(ht.TIsLength(3),
                              ht.TItems([ht.TNonEmptyString,
                                         ht.TNonEmptyString,
                                         ht.TListOf(ht.TNonEmptyString),
                                        ])))
         _NEVAC_FAILED = \
           ht.TListOf(ht.TAnd(ht.TIsLength(2),
                              ht.TItems([ht.TNonEmptyString,
                                         ht.TMaybeString,
                                        ])))
         _NEVAC_RESULT = ht.TAnd(ht.TIsLength(3),
                                 ht.TItems([_NEVAC_MOVED, _NEVAC_FAILED, _JOB_LIST]))
         _MODE_DATA = {
           constants.IALLOCATOR_MODE_ALLOC:
             (_AddNewInstance,
+             [
               ("name", ht.TString),
               ("memory", ht.TInt),
               ("disks", ht.TListOf(ht.TDict)),
               ("disk_template", ht.TString),
               ("os", ht.TString),
               ("tags", _STRING_LIST),
               ("nics", ht.TListOf(ht.TDict)),
               ("vcpus", ht.TInt),
               ("hypervisor", ht.TString),
               ], ht.TList),
           constants.IALLOCATOR_MODE_RELOC:
             (_AddRelocateInstance,
              [("name", ht.TString), ("relocate_from", _STRING_LIST)],
              ht.TList),
            constants.IALLOCATOR_MODE_NODE_EVAC:
             (_AddNodeEvacuate, [
               ("instances", _STRING_LIST),
               ("evac_mode", ht.TElemOf(constants.IALLOCATOR_NEVAC_MODES)),
               ], _NEVAC_RESULT),
            constants.IALLOCATOR_MODE_CHG_GROUP:
             (_AddChangeGroup, [
               ("instances", _STRING_LIST),
               ("target_groups", _STRING_LIST),
               ], _NEVAC_RESULT),
+          }
         def Run(self, name, validate=True, call_fn=None):
           """Run an instance allocator and return the results.
           """
           if call_fn is None:
             call_fn = self.rpc.call_iallocator_runner
           result = call_fn(self.cfg.GetMasterNode(), name, self.in_text)
           result.Raise("Failure while running the iallocator script")
           self.out_text = result.payload
           if validate:
             self._ValidateResult()
         def _ValidateResult(self):
           """Process the allocator results.
           This will process and if successful save the result in
           self.out_data and the other parameters.
           """
           try:
             rdict = serializer.Load(self.out_text)
           except Exception, err:
             raise errors.OpExecError("Can't parse iallocator results: %s" % str(err))
           if not isinstance(rdict, dict):
             raise errors.OpExecError("Can't parse iallocator results: not a dict")
           # TODO: remove backwards compatiblity in later versions
           if "nodes" in rdict and "result" not in rdict:
             rdict["result"] = rdict["nodes"]
             del rdict["nodes"]
           for key in "success", "info", "result":
             if key not in rdict:
               raise errors.OpExecError("Can't parse iallocator results:"
                                        " missing key '%s'" % key)
             setattr(self, key, rdict[key])
           if not self._result_check(self.result):
             raise errors.OpExecError("Iallocator returned invalid result,"
                                      " expected %s, got %s" %
                                      (self._result_check, self.result),
                                      errors.ECODE_INVAL)
           if self.mode == constants.IALLOCATOR_MODE_RELOC:
             assert self.relocate_from is not None
             assert self.required_nodes == 1
             node2group = dict((name, ndata["group"])
                               for (name, ndata) in self.in_data["nodes"].items())
             fn = compat.partial(self._NodesToGroups, node2group,
                                 self.in_data["nodegroups"])
             instance = self.cfg.GetInstanceInfo(self.name)
             request_groups = fn(self.relocate_from + [instance.primary_node])
             result_groups = fn(rdict["result"] + [instance.primary_node])
             if self.success and not set(result_groups).issubset(request_groups):
               raise errors.OpExecError("Groups of nodes returned by iallocator (%s)"
                                        " differ from original groups (%s)" %
                                        (utils.CommaJoin(result_groups),
                                         utils.CommaJoin(request_groups)))
           elif self.mode == constants.IALLOCATOR_MODE_NODE_EVAC:
             assert self.evac_mode in constants.IALLOCATOR_NEVAC_MODES
           self.out_data = rdict
         @staticmethod
         def _NodesToGroups(node2group, groups, nodes):
           """Returns a list of unique group names for a list of nodes.
           @type node2group: dict
           @param node2group: Map from node name to group UUID
           @type groups: dict
           @param groups: Group information
           @type nodes: list
           @param nodes: Node names
           """
           result = set()
           for node in nodes:
             try:
               group_uuid = node2group[node]
             except KeyError:
               # Ignore unknown node
               pass
             else:
               try:
                 group = groups[group_uuid]
               except KeyError:
                 # Can't find group, let's use UUID
                 group_name = group_uuid
               else:
                 group_name = group["name"]
               result.add(group_name)
           return sorted(result)
       class LUTestAllocator(NoHooksLU):
         """Run allocator tests.
         This LU runs the allocator tests
         """
         def CheckPrereq(self):
           """Check prerequisites.
           This checks the opcode parameters depending on the director and mode test.
           """
           if self.op.mode == constants.IALLOCATOR_MODE_ALLOC:
             for attr in ["memory", "disks", "disk_template",
                          "os", "tags", "nics", "vcpus"]:
               if not hasattr(self.op, attr):
                 raise errors.OpPrereqError("Missing attribute '%s' on opcode input" %
                                            attr, errors.ECODE_INVAL)
             iname = self.cfg.ExpandInstanceName(self.op.name)
             if iname is not None:
               raise errors.OpPrereqError("Instance '%s' already in the cluster" %
                                          iname, errors.ECODE_EXISTS)
             if not isinstance(self.op.nics, list):
               raise errors.OpPrereqError("Invalid parameter 'nics'",
                                          errors.ECODE_INVAL)
             if not isinstance(self.op.disks, list):
               raise errors.OpPrereqError("Invalid parameter 'disks'",
                                          errors.ECODE_INVAL)
             for row in self.op.disks:
               if (not isinstance(row, dict) or
                   constants.IDISK_SIZE not in row or
                   not isinstance(row[constants.IDISK_SIZE], int) or
                   constants.IDISK_MODE not in row or
                   row[constants.IDISK_MODE] not in constants.DISK_ACCESS_SET):
                 raise errors.OpPrereqError("Invalid contents of the 'disks'"
                                            " parameter", errors.ECODE_INVAL)
             if self.op.hypervisor is None:
               self.op.hypervisor = self.cfg.GetHypervisorType()
           elif self.op.mode == constants.IALLOCATOR_MODE_RELOC:
             fname = _ExpandInstanceName(self.cfg, self.op.name)
             self.op.name = fname
             self.relocate_from = \
                 list(self.cfg.GetInstanceInfo(fname).secondary_nodes)
           elif self.op.mode in (constants.IALLOCATOR_MODE_CHG_GROUP,
                                 constants.IALLOCATOR_MODE_NODE_EVAC):
             if not self.op.instances:
               raise errors.OpPrereqError("Missing instances", errors.ECODE_INVAL)
             self.op.instances = _GetWantedInstances(self, self.op.instances)
           else:
             raise errors.OpPrereqError("Invalid test allocator mode '%s'" %
                                        self.op.mode, errors.ECODE_INVAL)
           if self.op.direction == constants.IALLOCATOR_DIR_OUT:
             if self.op.allocator is None:
               raise errors.OpPrereqError("Missing allocator name",
                                          errors.ECODE_INVAL)
           elif self.op.direction != constants.IALLOCATOR_DIR_IN:
             raise errors.OpPrereqError("Wrong allocator test '%s'" %
                                        self.op.direction, errors.ECODE_INVAL)
         def Exec(self, feedback_fn):
           """Run the allocator test.
           """
           if self.op.mode == constants.IALLOCATOR_MODE_ALLOC:
             ial = IAllocator(self.cfg, self.rpc,
                              mode=self.op.mode,
                              name=self.op.name,
                              memory=self.op.memory,
                              disks=self.op.disks,
                              disk_template=self.op.disk_template,
                              os=self.op.os,
                              tags=self.op.tags,
                              nics=self.op.nics,
                              vcpus=self.op.vcpus,
                              hypervisor=self.op.hypervisor,
+                             )
           elif self.op.mode == constants.IALLOCATOR_MODE_RELOC:
             ial = IAllocator(self.cfg, self.rpc,
                              mode=self.op.mode,
                              name=self.op.name,
                              relocate_from=list(self.relocate_from),
+                             )
           elif self.op.mode == constants.IALLOCATOR_MODE_CHG_GROUP:
             ial = IAllocator(self.cfg, self.rpc,
                              mode=self.op.mode,
                              instances=self.op.instances,
                              target_groups=self.op.target_groups)
           elif self.op.mode == constants.IALLOCATOR_MODE_NODE_EVAC:
             ial = IAllocator(self.cfg, self.rpc,
                              mode=self.op.mode,
                              instances=self.op.instances,
                              evac_mode=self.op.evac_mode)
           else:
             raise errors.ProgrammerError("Uncatched mode %s in"
                                          " LUTestAllocator.Exec", self.op.mode)
           if self.op.direction == constants.IALLOCATOR_DIR_IN:
             result = ial.in_text
           else:
             ial.Run(self.op.allocator, validate=False)
             result = ial.out_text
           return result
       #: Query type implementations
       _QUERY_IMPL = {
         constants.QR_INSTANCE: _InstanceQuery,
         constants.QR_NODE: _NodeQuery,
         constants.QR_GROUP: _GroupQuery,
         constants.QR_OS: _OsQuery,
+        }
       assert set(_QUERY_IMPL.keys()) == constants.QR_VIA_OP
       def _GetQueryImplementation(name):
         """Returns the implemtnation for a query type.
         @param name: Query type, must be one of L{constants.QR_VIA_OP}
         """
         try:
           return _QUERY_IMPL[name]
         except KeyError:
           raise errors.OpPrereqError("Unknown query resource '%s'" % name,
                                      errors.ECODE_INVAL)

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