/lib/cmdlib.py - snf-ganeti - Greek Research and Technology Network's projects

| Branch: | Tag: | Revision:

root / lib / cmdlib.py @ c950e9f2

History | View | Annotate | Download (366.5 kB)

+      #
+      #
       # Copyright (C) 2006, 2007, 2008, 2009, 2010 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-msg=W0201,C0302
       # W0201 since most LU attributes are defined in CheckPrereq or similar
       # functions
       # C0302: since we have waaaay to 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
       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
       import ganeti.masterd.instance # pylint: disable-msg=W0611
       # Modifiable default values; need to define these here before the
       # actual LUs
       def _EmptyList():
         """Returns an empty list.
         """
         return []
       def _EmptyDict():
         """Returns an empty dict.
         """
         return {}
       #: The without-default default value
       _NoDefault = object()
       #: The no-type (value to complex to check it in the type system)
       _NoType = object()
       # Some basic types
       def _TNotNone(val):
         """Checks if the given value is not None.
         """
         return val is not None
       def _TNone(val):
         """Checks if the given value is None.
         """
         return val is None
       def _TBool(val):
         """Checks if the given value is a boolean.
         """
         return isinstance(val, bool)
       def _TInt(val):
         """Checks if the given value is an integer.
         """
         return isinstance(val, int)
       def _TFloat(val):
         """Checks if the given value is a float.
         """
         return isinstance(val, float)
       def _TString(val):
         """Checks if the given value is a string.
         """
         return isinstance(val, basestring)
       def _TTrue(val):
         """Checks if a given value evaluates to a boolean True value.
         """
         return bool(val)
       def _TElemOf(target_list):
         """Builds a function that checks if a given value is a member of a list.
         """
         return lambda val: val in target_list
       # Container types
       def _TList(val):
         """Checks if the given value is a list.
         """
         return isinstance(val, list)
       def _TDict(val):
         """Checks if the given value is a dictionary.
         """
         return isinstance(val, dict)
       # Combinator types
       def _TAnd(*args):
         """Combine multiple functions using an AND operation.
         """
         def fn(val):
           return compat.all(t(val) for t in args)
         return fn
       def _TOr(*args):
         """Combine multiple functions using an AND operation.
         """
         def fn(val):
           return compat.any(t(val) for t in args)
         return fn
       # Type aliases
       #: a non-empty string
       _TNonEmptyString = _TAnd(_TString, _TTrue)
       #: a maybe non-empty string
       _TMaybeString = _TOr(_TNonEmptyString, _TNone)
       #: a maybe boolean (bool or none)
       _TMaybeBool = _TOr(_TBool, _TNone)
       #: a positive integer
       _TPositiveInt = _TAnd(_TInt, lambda v: v >= 0)
       #: a strictly positive integer
       _TStrictPositiveInt = _TAnd(_TInt, lambda v: v > 0)
       def _TListOf(my_type):
         """Checks if a given value is a list with all elements of the same type.
         """
         return _TAnd(_TList,
                      lambda lst: compat.all(my_type(v) for v in lst))
       def _TDictOf(key_type, val_type):
         """Checks a dict type for the type of its key/values.
         """
         return _TAnd(_TDict,
                      lambda my_dict: (compat.all(key_type(v) for v in my_dict.keys())
                                       and compat.all(val_type(v)
                                                      for v in my_dict.values())))
       # Common opcode attributes
       #: output fields for a query operation
       _POutputFields = ("output_fields", _NoDefault, _TListOf(_TNonEmptyString))
       #: the shutdown timeout
       _PShutdownTimeout = ("shutdown_timeout", constants.DEFAULT_SHUTDOWN_TIMEOUT,
                            _TPositiveInt)
       #: the force parameter
       _PForce = ("force", False, _TBool)
       #: a required instance name (for single-instance LUs)
       _PInstanceName = ("instance_name", _NoDefault, _TNonEmptyString)
       #: a required node name (for single-node LUs)
       _PNodeName = ("node_name", _NoDefault, _TNonEmptyString)
       #: the migration type (live/non-live)
       _PMigrationMode = ("mode", None, _TOr(_TNone,
                                             _TElemOf(constants.HT_MIGRATION_MODES)))
       #: the obsolete 'live' mode (boolean)
       _PMigrationLive = ("live", None, _TMaybeBool)
       # End types
       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
           - 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)
         @cvar _OP_PARAMS: a list of opcode attributes, their defaults values
             they should get if not already defined, and types they must match
         """
         HPATH = None
         HTYPE = None
         _OP_PARAMS = []
         REQ_BGL = True
         def __init__(self, processor, op, context, rpc):
           """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.context = context
           self.rpc = rpc
           # Dicts used to declare locking needs to mcpu
           self.needed_locks = None
           self.acquired_locks = {}
           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 = {}
           self.__ssh = None
           # logging
           self.Log = processor.Log # pylint: disable-msg=C0103
           self.LogWarning = processor.LogWarning # pylint: disable-msg=C0103
           self.LogInfo = processor.LogInfo # pylint: disable-msg=C0103
           self.LogStep = processor.LogStep # pylint: disable-msg=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
           # The new kind-of-type-system
           op_id = self.op.OP_ID
           for attr_name, aval, test in self._OP_PARAMS:
             if not hasattr(op, attr_name):
               if aval == _NoDefault:
                 raise errors.OpPrereqError("Required parameter '%s.%s' missing" %
                                            (op_id, attr_name), errors.ECODE_INVAL)
               else:
                 if callable(aval):
                   dval = aval()
                 else:
                   dval = aval
                 setattr(self.op, attr_name, dval)
             attr_val = getattr(op, attr_name)
             if test == _NoType:
               # no tests here
               continue
             if not callable(test):
               raise errors.ProgrammerError("Validation for parameter '%s.%s' failed,"
                                            " given type is not a proper type (%s)" %
                                            (op_id, attr_name, test))
             if not test(attr_val):
               logging.error("OpCode %s, parameter %s, has invalid type %s/value %s",
                             self.op.OP_ID, attr_name, type(attr_val), attr_val)
               raise errors.OpPrereqError("Parameter '%s.%s' fails validation" %
                                          (op_id, attr_name), errors.ECODE_INVAL)
           self.CheckArguments()
         def __GetSSH(self):
           """Returns the SshRunner object
           """
           if not self.__ssh:
             self.__ssh = ssh.SshRunner(self.cfg.GetClusterName())
           return self.__ssh
         ssh = property(fget=__GetSSH)
         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, ecc. 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.
           This method should return a three-node tuple consisting of: a dict
           containing the environment that will be used for running the
           specific hook for this LU, 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.
           The keys of the dict must not have 'GANETI_' prefixed as this will
           be handled in the hooks runner. Also note additional keys will be
           added by the hooks runner. If the LU doesn't define any
           environment, an empty dict (and not None) should be returned.
           No nodes should be returned as an empty list (and not None).
           Note that if the HPATH for a LU class is 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-msg=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):
           """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
           """
           assert locking.LEVEL_NODE 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 = []
           for instance_name in self.acquired_locks[locking.LEVEL_INSTANCE]:
             instance = self.context.cfg.GetInstanceInfo(instance_name)
             wanted_nodes.append(instance.primary_node)
             if not primary_only:
               wanted_nodes.extend(instance.secondary_nodes)
           if self.recalculate_locks[locking.LEVEL_NODE] == constants.LOCKS_REPLACE:
             self.needed_locks[locking.LEVEL_NODE] = wanted_nodes
           elif self.recalculate_locks[locking.LEVEL_NODE] == constants.LOCKS_APPEND:
             self.needed_locks[locking.LEVEL_NODE].extend(wanted_nodes)
           del self.recalculate_locks[locking.LEVEL_NODE]
       class NoHooksLU(LogicalUnit): # pylint: disable-msg=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.
           """
           assert False, "BuildHooksEnv called for NoHooksLUs"
       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
       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 not nodes:
           raise errors.ProgrammerError("_GetWantedNodes should only be called with a"
             " non-empty list of nodes whose name is to be expanded.")
         wanted = [_ExpandNodeName(lu.cfg, name) for name in nodes]
         return utils.NiceSort(wanted)
       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 _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):
         """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
         @raise errors.OpPrereqError: if the node is offline
         """
         if lu.cfg.GetNodeInfo(node).offline:
           raise errors.OpPrereqError("Can't use offline node %s" % node,
                                      errors.ECODE_INVAL)
       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_INVAL)
       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 _RequireFileStorage():
         """Checks that file storage is enabled.
         @raise errors.OpPrereqError: when file storage is disabled
         """
         if not constants.ENABLE_FILE_STORAGE:
           raise errors.OpPrereqError("File storage disabled at configure time",
                                      errors.ECODE_INVAL)
       def _CheckDiskTemplate(template):
         """Ensure a given disk template is valid.
         """
         if template not in constants.DISK_TEMPLATES:
           msg = ("Invalid disk template name '%s', valid templates are: %s" %
                  (template, utils.CommaJoin(constants.DISK_TEMPLATES)))
           raise errors.OpPrereqError(msg, errors.ECODE_INVAL)
         if template == constants.DT_FILE:
           _RequireFileStorage()
         return True
       def _CheckStorageType(storage_type):
         """Ensure a given storage type is valid.
         """
         if storage_type not in constants.VALID_STORAGE_TYPES:
           raise errors.OpPrereqError("Unknown storage type: %s" % storage_type,
                                      errors.ECODE_INVAL)
         if storage_type == constants.ST_FILE:
           _RequireFileStorage()
         return True
       def _GetClusterDomainSecret():
         """Reads the cluster domain secret.
         """
         return utils.ReadOneLineFile(constants.CLUSTER_DOMAIN_SECRET_FILE,
                                      strict=True)
       def _CheckInstanceDown(lu, instance, reason):
         """Ensure that an instance is not running."""
         if instance.admin_up:
           raise errors.OpPrereqError("Instance %s is marked to be up, %s" %
                                      (instance.name, reason), errors.ECODE_STATE)
         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, reason), 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,
                                 memory, vcpus, nics, disk_template, disks,
                                 bep, hvp, hypervisor_name):
         """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: boolean
         @param status: the should_run status of the instance
         @type memory: string
         @param memory: the 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
         @rtype: dict
         @return: the hook environment for this instance
         """
         if status:
           str_status = "up"
         else:
           str_status = "down"
         env = {
           "OP_TARGET": name,
           "INSTANCE_NAME": name,
           "INSTANCE_PRIMARY": primary_node,
           "INSTANCE_SECONDARIES": " ".join(secondary_nodes),
           "INSTANCE_OS_TYPE": os_type,
           "INSTANCE_STATUS": str_status,
           "INSTANCE_MEMORY": memory,
           "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
         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 LUQueryInstanceData.
         @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_up,
           'memory': bep[constants.BE_MEMORY],
           '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,
+        }
         if override:
           args.update(override)
         return _BuildInstanceHookEnv(**args) # pylint: disable-msg=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
         """
         if not os_obj.supported_variants:
           return
         variant = objects.OS.GetVariant(name)
         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()]]
         return []
       def _FindFaultyInstanceDisks(cfg, rpc, instance, node_name, prereq):
         faulty = []
         for dev in instance.disks:
           cfg.SetDiskID(dev, node_name)
         result = rpc.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.")
       class LUPostInitCluster(LogicalUnit):
         """Logical unit for running hooks after cluster initialization.
         """
         HPATH = "cluster-init"
         HTYPE = constants.HTYPE_CLUSTER
         def BuildHooksEnv(self):
           """Build hooks env.
           """
           env = {"OP_TARGET": self.cfg.GetClusterName()}
           mn = self.cfg.GetMasterNode()
           return env, [], [mn]
         def Exec(self, feedback_fn):
           """Nothing to do.
           """
           return True
       class LUDestroyCluster(LogicalUnit):
         """Logical unit for destroying the cluster.
         """
         HPATH = "cluster-destroy"
         HTYPE = constants.HTYPE_CLUSTER
         def BuildHooksEnv(self):
           """Build hooks env.
           """
           env = {"OP_TARGET": self.cfg.GetClusterName()}
           return env, [], []
         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 = self.cfg.GetMasterNode()
           modify_ssh_setup = self.cfg.GetClusterInfo().modify_ssh_setup
           # Run post hooks on master node before it's removed
           hm = self.proc.hmclass(self.rpc.call_hooks_runner, self)
           try:
             hm.RunPhase(constants.HOOKS_PHASE_POST, [master])
           except:
             # pylint: disable-msg=W0702
             self.LogWarning("Errors occurred running hooks on %s" % master)
           result = self.rpc.call_node_stop_master(master, False)
           result.Raise("Could not disable the master role")
           if modify_ssh_setup:
             priv_key, pub_key, _ = ssh.GetUserFiles(constants.GANETI_RUNAS)
             utils.CreateBackup(priv_key)
             utils.CreateBackup(pub_key)
           return master
       def _VerifyCertificate(filename):
         """Verifies a certificate for LUVerifyCluster.
         @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-msg=W0703
           return (LUVerifyCluster.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 (LUVerifyCluster.ETYPE_WARNING, fnamemsg)
         elif errcode == utils.CERT_ERROR:
           return (LUVerifyCluster.ETYPE_ERROR, fnamemsg)
         raise errors.ProgrammerError("Unhandled certificate error code %r" % errcode)
       class LUVerifyCluster(LogicalUnit):
         """Verifies the cluster status.
         """
         HPATH = "cluster-verify"
         HTYPE = constants.HTYPE_CLUSTER
         _OP_PARAMS = [
           ("skip_checks", _EmptyList,
            _TListOf(_TElemOf(constants.VERIFY_OPTIONAL_CHECKS))),
           ("verbose", False, _TBool),
           ("error_codes", False, _TBool),
           ("debug_simulate_errors", False, _TBool),
+          ]
         REQ_BGL = False
         TCLUSTER = "cluster"
         TNODE = "node"
         TINSTANCE = "instance"
         ECLUSTERCFG = (TCLUSTER, "ECLUSTERCFG")
         ECLUSTERCERT = (TCLUSTER, "ECLUSTERCERT")
         EINSTANCEBADNODE = (TINSTANCE, "EINSTANCEBADNODE")
         EINSTANCEDOWN = (TINSTANCE, "EINSTANCEDOWN")
         EINSTANCELAYOUT = (TINSTANCE, "EINSTANCELAYOUT")
         EINSTANCEMISSINGDISK = (TINSTANCE, "EINSTANCEMISSINGDISK")
         EINSTANCEMISSINGDISK = (TINSTANCE, "EINSTANCEMISSINGDISK")
         EINSTANCEWRONGNODE = (TINSTANCE, "EINSTANCEWRONGNODE")
         ENODEDRBD = (TNODE, "ENODEDRBD")
         ENODEDRBDHELPER = (TNODE, "ENODEDRBDHELPER")
         ENODEFILECHECK = (TNODE, "ENODEFILECHECK")
         ENODEHOOKS = (TNODE, "ENODEHOOKS")
         ENODEHV = (TNODE, "ENODEHV")
         ENODELVM = (TNODE, "ENODELVM")
         ENODEN1 = (TNODE, "ENODEN1")
         ENODENET = (TNODE, "ENODENET")
         ENODEOS = (TNODE, "ENODEOS")
         ENODEORPHANINSTANCE = (TNODE, "ENODEORPHANINSTANCE")
         ENODEORPHANLV = (TNODE, "ENODEORPHANLV")
         ENODERPC = (TNODE, "ENODERPC")
         ENODESSH = (TNODE, "ENODESSH")
         ENODEVERSION = (TNODE, "ENODEVERSION")
         ENODESETUP = (TNODE, "ENODESETUP")
         ENODETIME = (TNODE, "ENODETIME")
         ETYPE_FIELD = "code"
         ETYPE_ERROR = "ERROR"
         ETYPE_WARNING = "WARNING"
         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: diction of {secondary-node: list of instances} of all peers
               of this node (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
           """
           def __init__(self, offline=False, name=None):
             self.name = name
             self.volumes = {}
             self.instances = []
             self.pinst = []
             self.sinst = []
             self.sbp = {}
             self.mfree = 0
             self.dfree = 0
             self.offline = offline
             self.rpc_fail = False
             self.lvm_fail = False
             self.hyp_fail = False
             self.ghost = False
             self.os_fail = False
             self.oslist = {}
         def ExpandNames(self):
           self.needed_locks = {
             locking.LEVEL_NODE: locking.ALL_SET,
             locking.LEVEL_INSTANCE: locking.ALL_SET,
+          }
           self.share_locks = dict.fromkeys(locking.LEVELS, 1)
         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:
             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)
         def _ErrorIf(self, cond, *args, **kwargs):
           """Log an error message if the passed condition is True.
           """
           cond = bool(cond) or self.op.debug_simulate_errors
           if cond:
             self._Error(*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
         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-msg=C0103
           # main result, nresult should be a non-empty dict
           test = not nresult or not isinstance(nresult, dict)
           _ErrorIf(test, self.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, self.ENODERPC, node,
                    "connection to node returned invalid data")
           if test:
             return False
           test = local_version != remote_version[0]
           _ErrorIf(test, self.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],
                         self.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 isinstance(hyp_result, dict):
             for hv_name, hv_result in hyp_result.iteritems():
               test = hv_result is not None
               _ErrorIf(test, self.ENODEHV, node,
                        "hypervisor %s verify failure: '%s'", hv_name, hv_result)
           test = nresult.get(constants.NV_NODESETUP,
                                  ["Missing NODESETUP results"])
           _ErrorIf(test, self.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-msg=C0103
           ntime = nresult.get(constants.NV_TIME, None)
           try:
             ntime_merged = utils.MergeTime(ntime)
           except (ValueError, TypeError):
             _ErrorIf(True, self.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, self.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 time.
           @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-msg=C0103
           # checks vg existence and size > 20G
           vglist = nresult.get(constants.NV_VGLIST, None)
           test = not vglist
           _ErrorIf(test, self.ENODELVM, node, "unable to check volume groups")
           if not test:
             vgstatus = utils.CheckVolumeGroupSize(vglist, vg_name,
                                                   constants.MIN_VG_SIZE)
             _ErrorIf(vgstatus, self.ENODELVM, node, vgstatus)
           # check pv names
           pvlist = nresult.get(constants.NV_PVLIST, None)
           test = pvlist is None
           _ErrorIf(test, self.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, self.ENODELVM, node, "Invalid character ':' in PV"
                        " '%s' of VG '%s'", pvname, owner_vg)
         def _VerifyNodeNetwork(self, ninfo, nresult):
           """Check the node time.
           @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-msg=C0103
           test = constants.NV_NODELIST not in nresult
           _ErrorIf(test, self.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, self.ENODESSH, node,
                          "ssh communication with node '%s': %s", a_node, a_msg)
           test = constants.NV_NODENETTEST not in nresult
           _ErrorIf(test, self.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, self.ENODENET, node,
                          "tcp communication with node '%s': %s",
                          anode, nresult[constants.NV_NODENETTEST][anode])
           test = constants.NV_MASTERIP not in nresult
           _ErrorIf(test, self.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, self.ENODENET, node, msg)
         def _VerifyInstance(self, instance, instanceconfig, node_image):
           """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-msg=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, self.EINSTANCEMISSINGDISK, instance,
                        "volume %s missing on node %s", volume, node)
           if instanceconfig.admin_up:
             pri_img = node_image[node_current]
             test = instance not in pri_img.instances and not pri_img.offline
             _ErrorIf(test, self.EINSTANCEDOWN, instance,
                      "instance not running on its primary node %s",
                      node_current)
           for node, n_img in node_image.items():
             if (not node == node_current):
               test = instance in n_img.instances
               _ErrorIf(test, self.EINSTANCEWRONGNODE, instance,
                        "instance should not run on node %s", node)
         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, self.ENODEORPHANLV, node,
                             "volume %s is unknown", volume)
         def _VerifyOrphanInstances(self, instancelist, node_image):
           """Verify the list of running instances.
           This checks what instances are running but unknown to the cluster.
           """
           for node, n_img in node_image.items():
             for o_inst in n_img.instances:
               test = o_inst not in instancelist
               self._ErrorIf(test, self.ENODEORPHANINSTANCE, node,
                             "instance %s on node %s should not exist", o_inst, node)
         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.
           """
           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.
             for prinode, instances in n_img.sbp.items():
               needed_mem = 0
               for instance in instances:
                 bep = self.cfg.GetClusterInfo().FillBE(instance_cfg[instance])
                 if bep[constants.BE_AUTO_BALANCE]:
                   needed_mem += bep[constants.BE_MEMORY]
               test = n_img.mfree < needed_mem
               self._ErrorIf(test, self.ENODEN1, node,
                             "not enough memory on to accommodate"
                             " failovers should peer node %s fail", prinode)
         def _VerifyNodeFiles(self, ninfo, nresult, file_list, local_cksum,
                              master_files):
           """Verifies and computes the node required file checksums.
           @type ninfo: L{objects.Node}
           @param ninfo: the node to check
           @param nresult: the remote results for the node
           @param file_list: required list of files
           @param local_cksum: dictionary of local files and their checksums
           @param master_files: list of files that only masters should have
           """
           node = ninfo.name
           _ErrorIf = self._ErrorIf # pylint: disable-msg=C0103
           remote_cksum = nresult.get(constants.NV_FILELIST, None)
           test = not isinstance(remote_cksum, dict)
           _ErrorIf(test, self.ENODEFILECHECK, node,
                    "node hasn't returned file checksum data")
           if test:
             return
           for file_name in file_list:
             node_is_mc = ninfo.master_candidate
             must_have = (file_name not in master_files) or node_is_mc
             # missing
             test1 = file_name not in remote_cksum
             # invalid checksum
             test2 = not test1 and remote_cksum[file_name] != local_cksum[file_name]
             # existing and good
             test3 = not test1 and remote_cksum[file_name] == local_cksum[file_name]
             _ErrorIf(test1 and must_have, self.ENODEFILECHECK, node,
                      "file '%s' missing", file_name)
             _ErrorIf(test2 and must_have, self.ENODEFILECHECK, node,
                      "file '%s' has wrong checksum", file_name)
             # not candidate and this is not a must-have file
             _ErrorIf(test2 and not must_have, self.ENODEFILECHECK, node,
                      "file '%s' should not exist on non master"
                      " candidates (and the file is outdated)", file_name)
             # all good, except non-master/non-must have combination
             _ErrorIf(test3 and not must_have, self.ENODEFILECHECK, node,
                      "file '%s' should not exist"
                      " on non master candidates", file_name)
         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-msg=C0103
           if drbd_helper:
             helper_result = nresult.get(constants.NV_DRBDHELPER, None)
             test = (helper_result == None)
             _ErrorIf(test, self.ENODEDRBDHELPER, node,
                      "no drbd usermode helper returned")
             if helper_result:
               status, payload = helper_result
               test = not status
               _ErrorIf(test, self.ENODEDRBDHELPER, node,
                        "drbd usermode helper check unsuccessful: %s", payload)
               test = status and (payload != drbd_helper)
               _ErrorIf(test, self.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, self.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_up)
           # and now check them
           used_minors = nresult.get(constants.NV_DRBDLIST, [])
           test = not isinstance(used_minors, (tuple, list))
           _ErrorIf(test, self.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, self.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, self.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-msg=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, self.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-msg=C0103
           assert not nimg.os_fail, "Entered _VerifyNodeOS with failed OS rpc?"
           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, self.ENODEOS, node,
                      "Invalid OS %s (located at %s): %s", os_name, f_path, f_diag)
             _ErrorIf(len(os_data) > 1, self.ENODEOS, node,
                      "OS '%s' has multiple entries (first one shadows the rest): %s",
                      os_name, utils.CommaJoin([v[0] for v in os_data]))
             # this will catched in backend too
             _ErrorIf(compat.any(v >= constants.OS_API_V15 for v in f_api)
                      and not f_var, self.ENODEOS, node,
                      "OS %s with API at least %d does not declare any variant",
                      os_name, constants.OS_API_V15)
             # comparisons with the 'base' image
             test = os_name not in base.oslist
             _ErrorIf(test, self.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", f_param, b_param)]:
               _ErrorIf(a != b, self.ENODEOS, node,
                        "OS %s %s differs from reference node %s: %s vs. %s",
                        kind, os_name, base.name,
                        utils.CommaJoin(a), utils.CommaJoin(b))
           # check any missing OSes
           missing = set(base.oslist.keys()).difference(nimg.oslist.keys())
           _ErrorIf(missing, self.ENODEOS, node,
                    "OSes present on reference node %s but missing on this node: %s",
                    base.name, utils.CommaJoin(missing))
         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-msg=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, self.ENODELVM, node, "LVM problem on node: %s",
                      utils.SafeEncode(lvdata))
           elif not isinstance(lvdata, dict):
             _ErrorIf(True, self.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, self.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-msg=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, self.ENODEHV, node, "rpc call to node failed (hvinfo)")
           if not test:
             try:
               nimg.mfree = int(hv_info["memory_free"])
             except (ValueError, TypeError):
               _ErrorIf(True, self.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, self.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, self.ENODERPC, node,
                          "node returned invalid LVM info, check LVM status")
         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.
           """
           all_nodes = self.cfg.GetNodeList()
           env = {
             "CLUSTER_TAGS": " ".join(self.cfg.GetClusterInfo().GetTags())
+            }
           for node in self.cfg.GetAllNodesInfo().values():
             env["NODE_TAGS_%s" % node.name] = " ".join(node.GetTags())
           return env, [], all_nodes
         def Exec(self, feedback_fn):
           """Verify integrity of cluster, performing various test on nodes.
           """
           self.bad = False
           _ErrorIf = self._ErrorIf # pylint: disable-msg=C0103
           verbose = self.op.verbose
           self._feedback_fn = feedback_fn
           feedback_fn("* Verifying global settings")
           for msg in self.cfg.VerifyConfig():
             _ErrorIf(True, self.ECLUSTERCFG, None, msg)
           # Check the cluster certificates
           for cert_filename in constants.ALL_CERT_FILES:
             (errcode, msg) = _VerifyCertificate(cert_filename)
             _ErrorIf(errcode, self.ECLUSTERCERT, None, msg, code=errcode)
           vg_name = self.cfg.GetVGName()
           drbd_helper = self.cfg.GetDRBDHelper()
           hypervisors = self.cfg.GetClusterInfo().enabled_hypervisors
           cluster = self.cfg.GetClusterInfo()
           nodelist = utils.NiceSort(self.cfg.GetNodeList())
           nodeinfo = [self.cfg.GetNodeInfo(nname) for nname in nodelist]
           instancelist = utils.NiceSort(self.cfg.GetInstanceList())
           instanceinfo = dict((iname, self.cfg.GetInstanceInfo(iname))
                               for iname in instancelist)
           i_non_redundant = [] # Non redundant instances
           i_non_a_balanced = [] # Non auto-balanced instances
           n_offline = 0 # Count of offline nodes
           n_drained = 0 # Count of nodes being drained
           node_vol_should = {}
           # FIXME: verify OS list
           # do local checksums
           master_files = [constants.CLUSTER_CONF_FILE]
           master_node = self.master_node = self.cfg.GetMasterNode()
           master_ip = self.cfg.GetMasterIP()
           file_names = ssconf.SimpleStore().GetFileList()
           file_names.extend(constants.ALL_CERT_FILES)
           file_names.extend(master_files)
           if cluster.modify_etc_hosts:
             file_names.append(constants.ETC_HOSTS)
           local_checksums = utils.FingerprintFiles(file_names)
           feedback_fn("* Gathering data (%d nodes)" % len(nodelist))
           node_verify_param = {
             constants.NV_FILELIST: file_names,
             constants.NV_NODELIST: [node.name for node in nodeinfo
                                     if not node.offline],
             constants.NV_HYPERVISOR: hypervisors,
             constants.NV_NODENETTEST: [(node.name, node.primary_ip,
                                         node.secondary_ip) for node in nodeinfo
                                        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,
+            }
           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
           # Build our expected cluster state
           node_image = dict((node.name, self.NodeImage(offline=node.offline,
                                                        name=node.name))
                             for node in nodeinfo)
           for instance in instancelist:
             inst_config = instanceinfo[instance]
             for nname in inst_config.all_nodes:
               if nname not in node_image:
                 # ghost node
                 gnode = self.NodeImage(name=nname)
                 gnode.ghost = True
                 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(nodelist, node_verify_param,
                                                  self.cfg.GetClusterName())
           nvinfo_endtime = time.time()
           all_drbd_map = self.cfg.ComputeDRBDMap()
           feedback_fn("* Verifying node status")
           refos_img = None
           for node_i in nodeinfo:
             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, self.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._VerifyNodeNetwork(node_i, nresult)
             self._VerifyNodeLVM(node_i, nresult, vg_name)
             self._VerifyNodeFiles(node_i, nresult, file_names, local_checksums,
                                   master_files)
             self._VerifyNodeDrbd(node_i, nresult, instanceinfo, drbd_helper,
                                  all_drbd_map)
             self._VerifyNodeTime(node_i, nresult, nvinfo_starttime, nvinfo_endtime)
             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)
           feedback_fn("* Verifying instance status")
           for instance in instancelist:
             if verbose:
               feedback_fn("* Verifying instance %s" % instance)
             inst_config = instanceinfo[instance]
             self._VerifyInstance(instance, inst_config, node_image)
             inst_nodes_offline = []
             pnode = inst_config.primary_node
             pnode_img = node_image[pnode]
             _ErrorIf(pnode_img.rpc_fail and not pnode_img.offline,
                      self.ENODERPC, pnode, "instance %s, connection to"
                      " primary node failed", instance)
             if pnode_img.offline:
               inst_nodes_offline.append(pnode)
             # 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, self.EINSTANCELAYOUT,
                      instance, "instance has multiple secondary nodes: %s",
                      utils.CommaJoin(inst_config.secondary_nodes),
                      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, self.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, self.EINSTANCEBADNODE, instance,
                      "instance lives on offline node(s) %s",
                      utils.CommaJoin(inst_nodes_offline))
             # ... or ghost nodes
             for node in inst_config.all_nodes:
               _ErrorIf(node_image[node].ghost, self.EINSTANCEBADNODE, instance,
                        "instance lives on ghost node %s", node)
           feedback_fn("* Verifying orphan volumes")
           reserved = utils.FieldSet(*cluster.reserved_lvs)
           self._VerifyOrphanVolumes(node_vol_should, node_image, reserved)
           feedback_fn("* Verifying orphan instances")
           self._VerifyOrphanInstances(instancelist, node_image)
           if constants.VERIFY_NPLUSONE_MEM not in self.op.skip_checks:
             feedback_fn("* Verifying N+1 Memory redundancy")
             self._VerifyNPlusOneMemory(node_image, instanceinfo)
           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 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, and are only interested in
           # their results
           if phase == constants.HOOKS_PHASE_POST:
             # Used to change hooks' output to proper indentation
             indent_re = re.compile('^', re.M)
             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, self.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.
                 # override manually lu_result here as _ErrorIf only
                 # overrides self.bad
                 lu_result = 1
                 continue
               for script, hkr, output in res.payload:
                 test = hkr == constants.HKR_FAIL
                 self._ErrorIf(test, self.ENODEHOOKS, node_name,
                               "Script %s failed, output:", script)
                 if test:
                   output = indent_re.sub('      ', output)
                   feedback_fn("%s" % output)
                   lu_result = 0
             return lu_result
       class LUVerifyDisks(NoHooksLU):
         """Verifies the cluster disks status.
         """
         REQ_BGL = False
         def ExpandNames(self):
           self.needed_locks = {
             locking.LEVEL_NODE: locking.ALL_SET,
             locking.LEVEL_INSTANCE: locking.ALL_SET,
+          }
           self.share_locks = dict.fromkeys(locking.LEVELS, 1)
         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
           """
           result = res_nodes, res_instances, res_missing = {}, [], {}
           vg_name = self.cfg.GetVGName()
           nodes = utils.NiceSort(self.cfg.GetNodeList())
           instances = [self.cfg.GetInstanceInfo(name)
                        for name in self.cfg.GetInstanceList()]
           nv_dict = {}
           for inst in instances:
             inst_lvs = {}
             if (not inst.admin_up or
                 inst.disk_template not in constants.DTS_NET_MIRROR):
               continue
             inst.MapLVsByNode(inst_lvs)
             # transform { iname: {node: [vol,],},} to {(node, vol): iname}
             for node, vol_list in inst_lvs.iteritems():
               for vol in vol_list:
                 nv_dict[(node, vol)] = inst
           if not nv_dict:
             return result
           node_lvs = self.rpc.call_lv_list(nodes, vg_name)
           for node in nodes:
             # node_volume
             node_res = node_lvs[node]
             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
             lvs = node_res.payload
             for lv_name, (_, _, lv_online) in lvs.items():
               inst = nv_dict.pop((node, lv_name), None)
               if (not lv_online and inst is not None
                   and inst.name not in res_instances):
                 res_instances.append(inst.name)
           # any leftover items in nv_dict are missing LVs, let's arrange the
           # data better
           for key, inst in nv_dict.iteritems():
             if inst.name not in res_missing:
               res_missing[inst.name] = []
             res_missing[inst.name].append(key)
           return result
       class LURepairDiskSizes(NoHooksLU):
         """Verifies the cluster disks sizes.
         """
         _OP_PARAMS = [("instances", _EmptyList, _TListOf(_TNonEmptyString))]
         REQ_BGL = False
         def ExpandNames(self):
           if self.op.instances:
             self.wanted_names = []
             for name in self.op.instances:
               full_name = _ExpandInstanceName(self.cfg, name)
               self.wanted_names.append(full_name)
             self.needed_locks = {
               locking.LEVEL_NODE: [],
               locking.LEVEL_INSTANCE: self.wanted_names,
+              }
             self.recalculate_locks[locking.LEVEL_NODE] = constants.LOCKS_REPLACE
           else:
             self.wanted_names = None
             self.needed_locks = {
               locking.LEVEL_NODE: locking.ALL_SET,
               locking.LEVEL_INSTANCE: locking.ALL_SET,
+              }
           self.share_locks = dict(((i, 1) for i in locking.LEVELS))
         def DeclareLocks(self, level):
           if level == locking.LEVEL_NODE and self.wanted_names is not None:
             self._LockInstancesNodes(primary_only=True)
         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.acquired_locks[locking.LEVEL_INSTANCE]
           self.wanted_instances = [self.cfg.GetInstanceInfo(name) for name
                                    in 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))
           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_getsizes(node, newl)
             if result.fail_msg:
               self.LogWarning("Failure in blockdev_getsizes call to node"
                               " %s, ignoring", node)
               continue
             if len(result.data) != len(dskl):
               self.LogWarning("Invalid result from node %s, ignoring node results",
                               node)
               continue
             for ((instance, idx, disk), size) in zip(dskl, result.data):
               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 LURenameCluster(LogicalUnit):
         """Rename the cluster.
         """
         HPATH = "cluster-rename"
         HTYPE = constants.HTYPE_CLUSTER
         _OP_PARAMS = [("name", _NoDefault, _TNonEmptyString)]
         def BuildHooksEnv(self):
           """Build hooks env.
           """
           env = {
             "OP_TARGET": self.cfg.GetClusterName(),
             "NEW_NAME": self.op.name,
+            }
           mn = self.cfg.GetMasterNode()
           all_nodes = self.cfg.GetNodeList()
           return env, [mn], all_nodes
         def CheckPrereq(self):
           """Verify that the passed name is a valid one.
           """
           hostname = netutils.GetHostInfo(self.op.name)
           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. Aborting." %
                                          new_ip, errors.ECODE_NOTUNIQUE)
           self.op.name = new_name
         def Exec(self, feedback_fn):
           """Rename the cluster.
           """
           clustername = self.op.name
           ip = self.ip
           # shutdown the master IP
           master = self.cfg.GetMasterNode()
           result = self.rpc.call_node_stop_master(master, False)
           result.Raise("Could not disable the master role")
           try:
             cluster = self.cfg.GetClusterInfo()
             cluster.cluster_name = clustername
             cluster.master_ip = 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.GetNodeList()
             try:
               node_list.remove(master)
             except ValueError:
               pass
             result = self.rpc.call_upload_file(node_list,
                                                constants.SSH_KNOWN_HOSTS_FILE)
             for to_node, to_result in result.iteritems():
               msg = to_result.fail_msg
               if msg:
                 msg = ("Copy of file %s to node %s failed: %s" %
                        (constants.SSH_KNOWN_HOSTS_FILE, to_node, msg))
                 self.proc.LogWarning(msg)
           finally:
             result = self.rpc.call_node_start_master(master, False, False)
             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
       class LUSetClusterParams(LogicalUnit):
         """Change the parameters of the cluster.
         """
         HPATH = "cluster-modify"
         HTYPE = constants.HTYPE_CLUSTER
         _OP_PARAMS = [
           ("vg_name", None, _TMaybeString),
           ("enabled_hypervisors", None,
            _TOr(_TAnd(_TListOf(_TElemOf(constants.HYPER_TYPES)), _TTrue), _TNone)),
           ("hvparams", None, _TOr(_TDictOf(_TNonEmptyString, _TDict), _TNone)),
           ("beparams", None, _TOr(_TDictOf(_TNonEmptyString, _TDict), _TNone)),
           ("os_hvp", None, _TOr(_TDictOf(_TNonEmptyString, _TDict), _TNone)),
           ("osparams", None, _TOr(_TDictOf(_TNonEmptyString, _TDict), _TNone)),
           ("candidate_pool_size", None, _TOr(_TStrictPositiveInt, _TNone)),
           ("uid_pool", None, _NoType),
           ("add_uids", None, _NoType),
           ("remove_uids", None, _NoType),
           ("maintain_node_health", None, _TMaybeBool),
           ("nicparams", None, _TOr(_TDict, _TNone)),
           ("drbd_helper", None, _TOr(_TString, _TNone)),
           ("default_iallocator", None, _TMaybeString),
           ("reserved_lvs", None, _TOr(_TListOf(_TNonEmptyString), _TNone)),
+          ]
         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)
         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.
           """
           env = {
             "OP_TARGET": self.cfg.GetClusterName(),
             "NEW_VG_NAME": self.op.vg_name,
+            }
           mn = self.cfg.GetMasterNode()
           return env, [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.acquired_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 in node_list:
               ninfo = self.cfg.GetNodeInfo(node)
               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:
             utils.ForceDictType(self.op.beparams, constants.BES_PARAMETER_TYPES)
             self.new_beparams = cluster.SimpleFillBE(self.op.beparams)
           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 nick with no ip" %
                                     (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)
           # 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.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:
             self.cluster.maintain_node_health = self.op.maintain_node_health
           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
           self.cfg.Update(self.cluster, feedback_fn)
       def _RedistributeAncillaryFiles(lu, additional_nodes=None):
         """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
         """
         # 1. Gather target nodes
         myself = lu.cfg.GetNodeInfo(lu.cfg.GetMasterNode())
         dist_nodes = lu.cfg.GetOnlineNodeList()
         if additional_nodes is not None:
           dist_nodes.extend(additional_nodes)
         if myself.name in dist_nodes:
           dist_nodes.remove(myself.name)
         # 2. Gather files to distribute
         dist_files = set([constants.ETC_HOSTS,
                           constants.SSH_KNOWN_HOSTS_FILE,
                           constants.RAPI_CERT_FILE,
                           constants.RAPI_USERS_FILE,
                           constants.CONFD_HMAC_KEY,
                           constants.CLUSTER_DOMAIN_SECRET_FILE,
                          ])
         enabled_hypervisors = lu.cfg.GetClusterInfo().enabled_hypervisors
         for hv_name in enabled_hypervisors:
           hv_class = hypervisor.GetHypervisor(hv_name)
           dist_files.update(hv_class.GetAncillaryFiles())
         # 3. Perform the files upload
         for fname in dist_files:
           if os.path.exists(fname):
             result = lu.rpc.call_upload_file(dist_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)
       class LURedistributeConfig(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)
       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 LUDiagnoseOS(NoHooksLU):
         """Logical unit for OS diagnose/query.
         """
         _OP_PARAMS = [
           _POutputFields,
           ("names", _EmptyList, _TListOf(_TNonEmptyString)),
+          ]
         REQ_BGL = False
         _HID = "hidden"
         _BLK = "blacklisted"
         _FIELDS_STATIC = utils.FieldSet()
         _FIELDS_DYNAMIC = utils.FieldSet("name", "valid", "node_status", "variants",
                                          "parameters", "api_versions", _HID, _BLK)
         def CheckArguments(self):
           if self.op.names:
             raise errors.OpPrereqError("Selective OS query not supported",
                                        errors.ECODE_INVAL)
           _CheckOutputFields(static=self._FIELDS_STATIC,
                              dynamic=self._FIELDS_DYNAMIC,
                              selected=self.op.output_fields)
         def ExpandNames(self):
           # Lock all nodes, in shared mode
           # Temporary removal of locks, should be reverted later
           # TODO: reintroduce locks when they are lighter-weight
           self.needed_locks = {}
           #self.share_locks[locking.LEVEL_NODE] = 1
           #self.needed_locks[locking.LEVEL_NODE] = locking.ALL_SET
         @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 Exec(self, feedback_fn):
           """Compute the list of OSes.
           """
           valid_nodes = [node for node in self.cfg.GetOnlineNodeList()]
           node_data = self.rpc.call_os_diagnose(valid_nodes)
           pol = self._DiagnoseByOS(node_data)
           output = []
           cluster = self.cfg.GetClusterInfo()
           for os_name, os_data in pol.items():
             row = []
             valid = True
             (variants, params, api_versions) = null_state = (set(), set(), set())
             for idx, osl in enumerate(os_data.values()):
               valid = bool(valid and osl and osl[0][1])
               if not valid:
                 (variants, params, api_versions) = null_state
                 break
               node_variants, node_params, node_api = osl[0][3:6]
               if idx == 0: # first entry
                 variants = set(node_variants)
                 params = set(node_params)
                 api_versions = set(node_api)
               else: # keep consistency
                 variants.intersection_update(node_variants)
                 params.intersection_update(node_params)
                 api_versions.intersection_update(node_api)
             is_hid = os_name in cluster.hidden_oss
             is_blk = os_name in cluster.blacklisted_oss
             if ((self._HID not in self.op.output_fields and is_hid) or
                 (self._BLK not in self.op.output_fields and is_blk)):
               continue
             for field in self.op.output_fields:
               if field == "name":
                 val = os_name
               elif field == "valid":
                 val = valid
               elif field == "node_status":
                 # this is just a copy of the dict
                 val = {}
                 for node_name, nos_list in os_data.items():
                   val[node_name] = nos_list
               elif field == "variants":
                 val = list(variants)
               elif field == "parameters":
                 val = list(params)
               elif field == "api_versions":
                 val = list(api_versions)
               elif field == self._HID:
                 val = is_hid
               elif field == self._BLK:
                 val = is_blk
               else:
                 raise errors.ParameterError(field)
               row.append(val)
             output.append(row)
           return output
       class LURemoveNode(LogicalUnit):
         """Logical unit for removing a node.
         """
         HPATH = "node-remove"
         HTYPE = constants.HTYPE_NODE
         _OP_PARAMS = [
           _PNodeName,
+          ]
         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.
           """
           env = {
             "OP_TARGET": self.op.node_name,
             "NODE_NAME": self.op.node_name,
+            }
           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 not found"
                             " in the all nodes list", self.op.node_name)
           return env, 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
           instance_list = self.cfg.GetInstanceList()
           masternode = self.cfg.GetMasterNode()
           if node.name == masternode:
             raise errors.OpPrereqError("Node is the master node,"
                                        " you need to failover first.",
                                        errors.ECODE_INVAL)
           for instance_name in instance_list:
             instance = self.cfg.GetInstanceInfo(instance_name)
             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
           # 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
           hm = self.proc.hmclass(self.rpc.call_hooks_runner, self)
           try:
             hm.RunPhase(constants.HOOKS_PHASE_POST, [node.name])
           except:
             # pylint: disable-msg=W0702
             self.LogWarning("Errors occurred running hooks on %s" % 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:
             # FIXME: this should be done via an rpc call to node daemon
             utils.RemoveHostFromEtcHosts(node.name)
             _RedistributeAncillaryFiles(self)
       class LUQueryNodes(NoHooksLU):
         """Logical unit for querying nodes.
         """
         # pylint: disable-msg=W0142
         _OP_PARAMS = [
           _POutputFields,
           ("names", _EmptyList, _TListOf(_TNonEmptyString)),
           ("use_locking", False, _TBool),
+          ]
         REQ_BGL = False
         _SIMPLE_FIELDS = ["name", "serial_no", "ctime", "mtime", "uuid",
                           "master_candidate", "offline", "drained"]
         _FIELDS_DYNAMIC = utils.FieldSet(
           "dtotal", "dfree",
           "mtotal", "mnode", "mfree",
           "bootid",
           "ctotal", "cnodes", "csockets",
+          )
         _FIELDS_STATIC = utils.FieldSet(*[
           "pinst_cnt", "sinst_cnt",
           "pinst_list", "sinst_list",
           "pip", "sip", "tags",
           "master",
           "role"] + _SIMPLE_FIELDS
+          )
         def CheckArguments(self):
           _CheckOutputFields(static=self._FIELDS_STATIC,
                              dynamic=self._FIELDS_DYNAMIC,
                              selected=self.op.output_fields)
         def ExpandNames(self):
           self.needed_locks = {}
           self.share_locks[locking.LEVEL_NODE] = 1
           if self.op.names:
             self.wanted = _GetWantedNodes(self, self.op.names)
           else:
             self.wanted = locking.ALL_SET
           self.do_node_query = self._FIELDS_STATIC.NonMatching(self.op.output_fields)
           self.do_locking = self.do_node_query and self.op.use_locking
           if self.do_locking:
             # if we don't request only static fields, we need to lock the nodes
             self.needed_locks[locking.LEVEL_NODE] = self.wanted
         def Exec(self, feedback_fn):
           """Computes the list of nodes and their attributes.
           """
           all_info = self.cfg.GetAllNodesInfo()
           if self.do_locking:
             nodenames = self.acquired_locks[locking.LEVEL_NODE]
           elif self.wanted != locking.ALL_SET:
             nodenames = self.wanted
             missing = set(nodenames).difference(all_info.keys())
             if missing:
               raise errors.OpExecError(
                 "Some nodes were removed before retrieving their data: %s" % missing)
           else:
             nodenames = all_info.keys()
           nodenames = utils.NiceSort(nodenames)
           nodelist = [all_info[name] for name in nodenames]
           # begin data gathering
           if self.do_node_query:
             live_data = {}
             node_data = self.rpc.call_node_info(nodenames, self.cfg.GetVGName(),
                                                 self.cfg.GetHypervisorType())
             for name in nodenames:
               nodeinfo = node_data[name]
               if not nodeinfo.fail_msg and nodeinfo.payload:
                 nodeinfo = nodeinfo.payload
                 fn = utils.TryConvert
                 live_data[name] = {
                   "mtotal": fn(int, nodeinfo.get('memory_total', None)),
                   "mnode": fn(int, nodeinfo.get('memory_dom0', None)),
                   "mfree": fn(int, nodeinfo.get('memory_free', None)),
                   "dtotal": fn(int, nodeinfo.get('vg_size', None)),
                   "dfree": fn(int, nodeinfo.get('vg_free', None)),
                   "ctotal": fn(int, nodeinfo.get('cpu_total', None)),
                   "bootid": nodeinfo.get('bootid', None),
                   "cnodes": fn(int, nodeinfo.get('cpu_nodes', None)),
                   "csockets": fn(int, nodeinfo.get('cpu_sockets', None)),
+                  }
               else:
                 live_data[name] = {}
           else:
             live_data = dict.fromkeys(nodenames, {})
           node_to_primary = dict([(name, set()) for name in nodenames])
           node_to_secondary = dict([(name, set()) for name in nodenames])
           inst_fields = frozenset(("pinst_cnt", "pinst_list",
                                    "sinst_cnt", "sinst_list"))
           if inst_fields & frozenset(self.op.output_fields):
             inst_data = self.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)
           master_node = self.cfg.GetMasterNode()
           # end data gathering
           output = []
           for node in nodelist:
             node_output = []
             for field in self.op.output_fields:
               if field in self._SIMPLE_FIELDS:
                 val = getattr(node, field)
               elif field == "pinst_list":
                 val = list(node_to_primary[node.name])
               elif field == "sinst_list":
                 val = list(node_to_secondary[node.name])
               elif field == "pinst_cnt":
                 val = len(node_to_primary[node.name])
               elif field == "sinst_cnt":
                 val = len(node_to_secondary[node.name])
               elif field == "pip":
                 val = node.primary_ip
               elif field == "sip":
                 val = node.secondary_ip
               elif field == "tags":
                 val = list(node.GetTags())
               elif field == "master":
                 val = node.name == master_node
               elif self._FIELDS_DYNAMIC.Matches(field):
                 val = live_data[node.name].get(field, None)
               elif field == "role":
                 if node.name == master_node:
                   val = "M"
                 elif node.master_candidate:
                   val = "C"
                 elif node.drained:
                   val = "D"
                 elif node.offline:
                   val = "O"
                 else:
                   val = "R"
               else:
                 raise errors.ParameterError(field)
               node_output.append(val)
             output.append(node_output)
           return output
       class LUQueryNodeVolumes(NoHooksLU):
         """Logical unit for getting volumes on node(s).
         """
         _OP_PARAMS = [
           ("nodes", _EmptyList, _TListOf(_TNonEmptyString)),
           ("output_fields", _NoDefault, _TListOf(_TNonEmptyString)),
+          ]
         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.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):
           """Computes the list of nodes and their attributes.
           """
           nodenames = self.acquired_locks[locking.LEVEL_NODE]
           volumes = self.rpc.call_node_volumes(nodenames)
           ilist = [self.cfg.GetInstanceInfo(iname) for iname
                    in self.cfg.GetInstanceList()]
           lv_by_node = dict([(inst, inst.MapLVsByNode()) for inst in ilist])
           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 = nresult.payload[:]
             node_vols.sort(key=lambda vol: vol['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":
                   for inst in ilist:
                     if node not in lv_by_node[inst]:
                       continue
                     if vol['name'] in lv_by_node[inst][node]:
                       val = inst.name
                       break
                   else:
                     val = '-'
                 else:
                   raise errors.ParameterError(field)
                 node_output.append(str(val))
               output.append(node_output)
           return output
       class LUQueryNodeStorage(NoHooksLU):
         """Logical unit for getting information on storage units on node(s).
         """
         _FIELDS_STATIC = utils.FieldSet(constants.SF_NODE)
         _OP_PARAMS = [
           ("nodes", _EmptyList, _TListOf(_TNonEmptyString)),
           ("storage_type", _NoDefault, _CheckStorageType),
           ("output_fields", _NoDefault, _TListOf(_TNonEmptyString)),
           ("name", None, _TMaybeString),
+          ]
         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.needed_locks = {}
           self.share_locks[locking.LEVEL_NODE] = 1
           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.acquired_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 LUModifyNodeStorage(NoHooksLU):
         """Logical unit for modifying a storage volume on a node.
         """
         _OP_PARAMS = [
           _PNodeName,
           ("storage_type", _NoDefault, _CheckStorageType),
           ("name", _NoDefault, _TNonEmptyString),
           ("changes", _NoDefault, _TDict),
+          ]
         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 LUAddNode(LogicalUnit):
         """Logical unit for adding node to the cluster.
         """
         HPATH = "node-add"
         HTYPE = constants.HTYPE_NODE
         _OP_PARAMS = [
           _PNodeName,
           ("primary_ip", None, _NoType),
           ("secondary_ip", None, _TMaybeString),
           ("readd", False, _TBool),
+          ]
         def CheckArguments(self):
           # validate/normalize the node name
           self.op.node_name = netutils.HostInfo.NormalizeName(self.op.node_name)
         def BuildHooksEnv(self):
           """Build hooks env.
           This will run on all nodes before, and on all nodes + the new node after.
           """
           env = {
             "OP_TARGET": self.op.node_name,
             "NODE_NAME": self.op.node_name,
             "NODE_PIP": self.op.primary_ip,
             "NODE_SIP": self.op.secondary_ip,
+            }
           nodes_0 = self.cfg.GetNodeList()
           nodes_1 = nodes_0 + [self.op.node_name, ]
           return env, nodes_0, nodes_1
         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.
           """
           node_name = self.op.node_name
           cfg = self.cfg
           dns_data = netutils.GetHostInfo(node_name)
           node = dns_data.name
           primary_ip = self.op.primary_ip = dns_data.ip
           if self.op.secondary_ip is None:
             self.op.secondary_ip = primary_ip
           if not netutils.IsValidIP4(self.op.secondary_ip):
             raise errors.OpPrereqError("Invalid secondary IP given",
                                        errors.ECODE_INVAL)
           secondary_ip = self.op.secondary_ip
           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 in node_list:
             existing_node = cfg.GetNodeInfo(existing_node_name)
             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)
           # 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 private ip but the"
                                          " new node has one",
                                          errors.ECODE_INVAL)
             else:
               raise errors.OpPrereqError("The master has a private 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 noded port",
                                          errors.ECODE_ENVIRON)
           if self.op.readd:
             exceptions = [node]
           else:
             exceptions = []
           self.master_candidate = _DecideSelfPromotion(self, exceptions=exceptions)
           if self.op.readd:
             self.new_node = self.cfg.GetNodeInfo(node)
             assert self.new_node is not None, "Can't retrieve locked node %s" % node
           else:
             self.new_node = objects.Node(name=node,
                                          primary_ip=primary_ip,
                                          secondary_ip=secondary_ip,
                                          master_candidate=self.master_candidate,
                                          offline=False, drained=False)
         def Exec(self, feedback_fn):
           """Adds the new node to the cluster.
           """
           new_node = self.new_node
           node = new_node.name
           # 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-msg=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
           # notify the user about any possible mc promotion
           if new_node.master_candidate:
             self.LogInfo("Node will be a master candidate")
           # 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))
           # setup ssh on node
           if self.cfg.GetClusterInfo().modify_ssh_setup:
             logging.info("Copy ssh key to node %s", node)
             priv_key, pub_key, _ = ssh.GetUserFiles(constants.GANETI_RUNAS)
             keyarray = []
             keyfiles = [constants.SSH_HOST_DSA_PRIV, constants.SSH_HOST_DSA_PUB,
                         constants.SSH_HOST_RSA_PRIV, constants.SSH_HOST_RSA_PUB,
                         priv_key, pub_key]
             for i in keyfiles:
               keyarray.append(utils.ReadFile(i))
             result = self.rpc.call_node_add(node, keyarray[0], keyarray[1],
                                             keyarray[2], keyarray[3], keyarray[4],
                                             keyarray[5])
             result.Raise("Cannot transfer ssh keys to the new node")
           # Add node to our /etc/hosts, and add key to known_hosts
           if self.cfg.GetClusterInfo().modify_etc_hosts:
             # FIXME: this should be done via an rpc call to node daemon
             utils.AddHostToEtcHosts(new_node.name)
           if new_node.secondary_ip != new_node.primary_ip:
             result = self.rpc.call_node_has_ip_address(new_node.name,
                                                        new_node.secondary_ip)
             result.Raise("Failure checking secondary ip on node %s" % new_node.name,
                          prereq=True, ecode=errors.ECODE_ENVIRON)
             if not result.payload:
               raise errors.OpExecError("Node claims it doesn't have the secondary ip"
                                        " you gave (%s). Please fix and re-run this"
                                        " command." % new_node.secondary_ip)
           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])
             self.context.AddNode(new_node, self.proc.GetECId())
       class LUSetNodeParams(LogicalUnit):
         """Modifies the parameters of a node.
         """
         HPATH = "node-modify"
         HTYPE = constants.HTYPE_NODE
         _OP_PARAMS = [
           _PNodeName,
           ("master_candidate", None, _TMaybeBool),
           ("offline", None, _TMaybeBool),
           ("drained", None, _TMaybeBool),
           ("auto_promote", False, _TBool),
           _PForce,
+          ]
         REQ_BGL = False
         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]
           if all_mods.count(None) == 3:
             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're offlining or draining the node
           self.offline_or_drain = (self.op.offline == True or
                                    self.op.drained == True)
           self.deoffline_or_drain = (self.op.offline == False or
                                      self.op.drained == False)
           self.might_demote = (self.op.master_candidate == False or
                                self.offline_or_drain)
           self.lock_all = self.op.auto_promote and self.might_demote
         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}
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on the master node.
           """
           env = {
             "OP_TARGET": self.op.node_name,
             "MASTER_CANDIDATE": str(self.op.master_candidate),
             "OFFLINE": str(self.op.offline),
             "DRAINED": str(self.op.drained),
+            }
           nl = [self.cfg.GetMasterNode(),
                 self.op.node_name]
           return env, 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.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 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 to allow promotion",
                                          errors.ECODE_INVAL)
           if (self.op.master_candidate == True and
               ((node.offline and not self.op.offline == False) or
                (node.drained and not self.op.drained == False))):
             raise errors.OpPrereqError("Node '%s' is offline or drained, can't set"
                                        " to master_candidate" % node.name,
                                        errors.ECODE_INVAL)
           # If we're being deofflined/drained, we'll MC ourself if needed
           if (self.deoffline_or_drain and not self.offline_or_drain and not
               self.op.master_candidate == True and not node.master_candidate):
             self.op.master_candidate = _DecideSelfPromotion(self)
             if self.op.master_candidate:
               self.LogInfo("Autopromoting node to master candidate")
           return
         def Exec(self, feedback_fn):
           """Modifies a node.
           """
           node = self.node
           result = []
           changed_mc = False
           if self.op.offline is not None:
             node.offline = self.op.offline
             result.append(("offline", str(self.op.offline)))
             if self.op.offline == True:
               if node.master_candidate:
                 node.master_candidate = False
                 changed_mc = True
                 result.append(("master_candidate", "auto-demotion due to offline"))
               if node.drained:
                 node.drained = False
                 result.append(("drained", "clear drained status due to offline"))
           if self.op.master_candidate is not None:
             node.master_candidate = self.op.master_candidate
             changed_mc = True
             result.append(("master_candidate", str(self.op.master_candidate)))
             if self.op.master_candidate == False:
               rrc = self.rpc.call_node_demote_from_mc(node.name)
               msg = rrc.fail_msg
               if msg:
                 self.LogWarning("Node failed to demote itself: %s" % msg)
           if self.op.drained is not None:
             node.drained = self.op.drained
             result.append(("drained", str(self.op.drained)))
             if self.op.drained == True:
               if node.master_candidate:
                 node.master_candidate = False
                 changed_mc = True
                 result.append(("master_candidate", "auto-demotion due to drain"))
                 rrc = self.rpc.call_node_demote_from_mc(node.name)
                 msg = rrc.fail_msg
                 if msg:
                   self.LogWarning("Node failed to demote itself: %s" % msg)
               if node.offline:
                 node.offline = False
                 result.append(("offline", "clear offline status due to drain"))
           # we locked all nodes, we adjust the CP before updating this node
           if self.lock_all:
             _AdjustCandidatePool(self, [node.name])
           # this will trigger configuration file update, if needed
           self.cfg.Update(node, feedback_fn)
           # this will trigger job queue propagation or cleanup
           if changed_mc:
             self.context.ReaddNode(node)
           return result
       class LUPowercycleNode(NoHooksLU):
         """Powercycles a node.
         """
         _OP_PARAMS = [
           _PNodeName,
           _PForce,
+          ]
         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 LUQueryClusterInfo(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
           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.enabled_hypervisors[0],
             "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,
             "candidate_pool_size": cluster.candidate_pool_size,
             "master_netdev": cluster.master_netdev,
             "volume_group_name": cluster.volume_group_name,
             "drbd_usermode_helper": cluster.drbd_usermode_helper,
             "file_storage_dir": cluster.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,
+            }
           return result
       class LUQueryConfigValues(NoHooksLU):
         """Return configuration values.
         """
         _OP_PARAMS = [_POutputFields]
         REQ_BGL = False
         _FIELDS_DYNAMIC = utils.FieldSet()
         _FIELDS_STATIC = utils.FieldSet("cluster_name", "master_node", "drain_flag",
                                         "watcher_pause")
         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)
             else:
               raise errors.ParameterError(field)
             values.append(entry)
           return values
       class LUActivateInstanceDisks(NoHooksLU):
         """Bring up an instance's disks.
         """
         _OP_PARAMS = [
           _PInstanceName,
           ("ignore_size", False, _TBool),
+          ]
         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 inst_disk in 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)
             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 inst_disk in 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)
             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 LUDeactivateInstanceDisks(NoHooksLU):
         """Shutdown an instance's disks.
         """
         _OP_PARAMS = [
           _PInstanceName,
+          ]
         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
           _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.
         """
         _CheckInstanceDown(lu, instance, "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 not ignore_primary or node != instance.primary_node:
                 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], lu.cfg.GetVGName(), hypervisor_name)
         nodeinfo[node].Raise("Can't get data from node %s" % node,
                              prereq=True, ecode=errors.ECODE_ENVIRON)
         free_mem = nodeinfo[node].payload.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 _CheckNodesFreeDisk(lu, nodenames, requested):
         """Checks if nodes have enough free disk space in the default 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 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, lu.cfg.GetVGName(),
                                          lu.cfg.GetHypervisorType())
         for node in nodenames:
           info = nodeinfo[node]
           info.Raise("Cannot get current information from node %s" % node,
                      prereq=True, ecode=errors.ECODE_ENVIRON)
           vg_free = info.payload.get("vg_free", None)
           if not isinstance(vg_free, int):
             raise errors.OpPrereqError("Can't compute free disk space on node %s,"
                                        " result was '%s'" % (node, vg_free),
                                        errors.ECODE_ENVIRON)
           if requested > vg_free:
             raise errors.OpPrereqError("Not enough disk space on target node %s:"
                                        " required %d MiB, available %d MiB" %
                                        (node, requested, vg_free),
                                        errors.ECODE_NORES)
       class LUStartupInstance(LogicalUnit):
         """Starts an instance.
         """
         HPATH = "instance-start"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_PARAMS = [
           _PInstanceName,
           _PForce,
           ("hvparams", _EmptyDict, _TDict),
           ("beparams", _EmptyDict, _TDict),
+          ]
         REQ_BGL = False
         def CheckArguments(self):
           # extra beparams
           if self.op.beparams:
             # fill the beparams dict
             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))
           nl = [self.cfg.GetMasterNode()] + list(self.instance.all_nodes)
           return env, 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)
           _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_MEMORY], instance.hypervisor)
         def Exec(self, feedback_fn):
           """Start the instance.
           """
           instance = self.instance
           force = self.op.force
           self.cfg.MarkInstanceUp(instance.name)
           node_current = instance.primary_node
           _StartInstanceDisks(self, instance, force)
           result = self.rpc.call_instance_start(node_current, instance,
                                                 self.op.hvparams, self.op.beparams)
           msg = result.fail_msg
           if msg:
             _ShutdownInstanceDisks(self, instance)
             raise errors.OpExecError("Could not start instance: %s" % msg)
       class LURebootInstance(LogicalUnit):
         """Reboot an instance.
         """
         HPATH = "instance-reboot"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_PARAMS = [
           _PInstanceName,
           ("ignore_secondaries", False, _TBool),
           ("reboot_type", _NoDefault, _TElemOf(constants.REBOOT_TYPES)),
           _PShutdownTimeout,
+          ]
         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))
           nl = [self.cfg.GetMasterNode()] + list(self.instance.all_nodes)
           return env, 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
           _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
           node_current = instance.primary_node
           if 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:
             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)
             _StartInstanceDisks(self, instance, ignore_secondaries)
             result = self.rpc.call_instance_start(node_current, instance, None, None)
             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 LUShutdownInstance(LogicalUnit):
         """Shutdown an instance.
         """
         HPATH = "instance-stop"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_PARAMS = [
           _PInstanceName,
           ("timeout", constants.DEFAULT_SHUTDOWN_TIMEOUT, _TPositiveInt),
+          ]
         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
           nl = [self.cfg.GetMasterNode()] + list(self.instance.all_nodes)
           return env, 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
           _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
           self.cfg.MarkInstanceDown(instance.name)
           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 LUReinstallInstance(LogicalUnit):
         """Reinstall an instance.
         """
         HPATH = "instance-reinstall"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_PARAMS = [
           _PInstanceName,
           ("os_type", None, _TMaybeString),
           ("force_variant", False, _TBool),
+          ]
         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)
           nl = [self.cfg.GetMasterNode()] + list(self.instance.all_nodes)
           return env, 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)
           if instance.disk_template == constants.DT_DISKLESS:
             raise errors.OpPrereqError("Instance '%s' has no disks" %
                                        self.op.instance_name,
                                        errors.ECODE_INVAL)
           _CheckInstanceDown(self, instance, "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)
           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
             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, 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 LURecreateInstanceDisks(LogicalUnit):
         """Recreate an instance's missing disks.
         """
         HPATH = "instance-recreate-disks"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_PARAMS = [
           _PInstanceName,
           ("disks", _EmptyList, _TListOf(_TPositiveInt)),
+          ]
         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)
           nl = [self.cfg.GetMasterNode()] + list(self.instance.all_nodes)
           return env, 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)
           if instance.disk_template == constants.DT_DISKLESS:
             raise errors.OpPrereqError("Instance '%s' has no disks" %
                                        self.op.instance_name, errors.ECODE_INVAL)
           _CheckInstanceDown(self, instance, "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 passed '%s'" % idx,
                                            errors.ECODE_INVAL)
           self.instance = instance
         def Exec(self, feedback_fn):
           """Recreate the disks.
           """
           to_skip = []
           for idx, _ in enumerate(self.instance.disks):
             if idx not in self.op.disks: # disk idx has not been passed in
               to_skip.append(idx)
               continue
           _CreateDisks(self, self.instance, to_skip=to_skip)
       class LURenameInstance(LogicalUnit):
         """Rename an instance.
         """
         HPATH = "instance-rename"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_PARAMS = [
           _PInstanceName,
           ("new_name", _NoDefault, _TNonEmptyString),
           ("ip_check", False, _TBool),
           ("name_check", True, _TBool),
+          ]
         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("Cannot do ip check without 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
           nl = [self.cfg.GetMasterNode()] + list(self.instance.all_nodes)
           return env, 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)
           _CheckInstanceDown(self, instance, "cannot rename")
           self.instance = instance
           new_name = self.op.new_name
           if self.op.name_check:
             hostinfo = netutils.HostInfo(netutils.HostInfo.NormalizeName(new_name))
             new_name = hostinfo.name
             if (self.op.ip_check and
                 netutils.TcpPing(hostinfo.ip, constants.DEFAULT_NODED_PORT)):
               raise errors.OpPrereqError("IP %s of instance %s already in use" %
                                          (hostinfo.ip, new_name),
                                          errors.ECODE_NOTUNIQUE)
           instance_list = self.cfg.GetInstanceList()
           if new_name in instance_list:
             raise errors.OpPrereqError("Instance '%s' is already in the cluster" %
                                        new_name, errors.ECODE_EXISTS)
         def Exec(self, feedback_fn):
           """Reinstall the instance.
           """
           inst = self.instance
           old_name = inst.name
           if inst.disk_template == constants.DT_FILE:
             old_file_storage_dir = os.path.dirname(inst.disks[0].logical_id[1])
           self.cfg.RenameInstance(inst.name, self.op.new_name)
           # Change the instance lock. This is definitely safe while we hold the BGL
           self.context.glm.remove(locking.LEVEL_INSTANCE, old_name)
           self.context.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 inst.disk_template == constants.DT_FILE:
             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 LURemoveInstance(LogicalUnit):
         """Remove an instance.
         """
         HPATH = "instance-remove"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_PARAMS = [
           _PInstanceName,
           ("ignore_failures", False, _TBool),
           _PShutdownTimeout,
+          ]
         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 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
           nl = [self.cfg.GetMasterNode()]
           nl_post = list(self.instance.all_nodes) + nl
           return env, 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))
           _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 LUQueryInstances(NoHooksLU):
         """Logical unit for querying instances.
         """
         # pylint: disable-msg=W0142
         _OP_PARAMS = [
           ("output_fields", _NoDefault, _TListOf(_TNonEmptyString)),
           ("names", _EmptyList, _TListOf(_TNonEmptyString)),
           ("use_locking", False, _TBool),
+          ]
         REQ_BGL = False
         _SIMPLE_FIELDS = ["name", "os", "network_port", "hypervisor",
                           "serial_no", "ctime", "mtime", "uuid"]
         _FIELDS_STATIC = utils.FieldSet(*["name", "os", "pnode", "snodes",
                                           "admin_state",
                                           "disk_template", "ip", "mac", "bridge",
                                           "nic_mode", "nic_link",
                                           "sda_size", "sdb_size", "vcpus", "tags",
                                           "network_port", "beparams",
                                           r"(disk)\.(size)/([0-9]+)",
                                           r"(disk)\.(sizes)", "disk_usage",
                                           r"(nic)\.(mac|ip|mode|link)/([0-9]+)",
                                           r"(nic)\.(bridge)/([0-9]+)",
                                           r"(nic)\.(macs|ips|modes|links|bridges)",
                                           r"(disk|nic)\.(count)",
                                           "hvparams",
                                           ] + _SIMPLE_FIELDS +
                                         ["hv/%s" % name
                                          for name in constants.HVS_PARAMETERS
                                          if name not in constants.HVC_GLOBALS] +
                                         ["be/%s" % name
                                          for name in constants.BES_PARAMETERS])
         _FIELDS_DYNAMIC = utils.FieldSet("oper_state",
                                          "oper_ram",
                                          "oper_vcpus",
                                          "status")
         def CheckArguments(self):
           _CheckOutputFields(static=self._FIELDS_STATIC,
                              dynamic=self._FIELDS_DYNAMIC,
                              selected=self.op.output_fields)
         def ExpandNames(self):
           self.needed_locks = {}
           self.share_locks[locking.LEVEL_INSTANCE] = 1
           self.share_locks[locking.LEVEL_NODE] = 1
           if self.op.names:
             self.wanted = _GetWantedInstances(self, self.op.names)
           else:
             self.wanted = locking.ALL_SET
           self.do_node_query = self._FIELDS_STATIC.NonMatching(self.op.output_fields)
           self.do_locking = self.do_node_query and self.op.use_locking
           if self.do_locking:
             self.needed_locks[locking.LEVEL_INSTANCE] = self.wanted
             self.needed_locks[locking.LEVEL_NODE] = []
             self.recalculate_locks[locking.LEVEL_NODE] = constants.LOCKS_REPLACE
         def DeclareLocks(self, level):
           if level == locking.LEVEL_NODE and self.do_locking:
             self._LockInstancesNodes()
         def Exec(self, feedback_fn):
           """Computes the list of nodes and their attributes.
           """
           # pylint: disable-msg=R0912
           # way too many branches here
           all_info = self.cfg.GetAllInstancesInfo()
           if self.wanted == locking.ALL_SET:
             # caller didn't specify instance names, so ordering is not important
             if self.do_locking:
               instance_names = self.acquired_locks[locking.LEVEL_INSTANCE]
             else:
               instance_names = all_info.keys()
             instance_names = utils.NiceSort(instance_names)
           else:
             # caller did specify names, so we must keep the ordering
             if self.do_locking:
               tgt_set = self.acquired_locks[locking.LEVEL_INSTANCE]
             else:
               tgt_set = all_info.keys()
             missing = set(self.wanted).difference(tgt_set)
             if missing:
               raise errors.OpExecError("Some instances were removed before"
                                        " retrieving their data: %s" % missing)
             instance_names = self.wanted
           instance_list = [all_info[iname] for iname in instance_names]
           # begin data gathering
           nodes = frozenset([inst.primary_node for inst in instance_list])
           hv_list = list(set([inst.hypervisor for inst in instance_list]))
           bad_nodes = []
           off_nodes = []
           if self.do_node_query:
             live_data = {}
             node_data = self.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
                 off_nodes.append(name)
               if result.fail_msg:
                 bad_nodes.append(name)
               else:
                 if result.payload:
                   live_data.update(result.payload)
                 # else no instance is alive
           else:
             live_data = dict([(name, {}) for name in instance_names])
           # end data gathering
           HVPREFIX = "hv/"
           BEPREFIX = "be/"
           output = []
           cluster = self.cfg.GetClusterInfo()
           for instance in instance_list:
             iout = []
             i_hv = cluster.FillHV(instance, skip_globals=True)
             i_be = cluster.FillBE(instance)
             i_nicp = [cluster.SimpleFillNIC(nic.nicparams) for nic in instance.nics]
             for field in self.op.output_fields:
               st_match = self._FIELDS_STATIC.Matches(field)
               if field in self._SIMPLE_FIELDS:
                 val = getattr(instance, field)
               elif field == "pnode":
                 val = instance.primary_node
               elif field == "snodes":
                 val = list(instance.secondary_nodes)
               elif field == "admin_state":
                 val = instance.admin_up
               elif field == "oper_state":
                 if instance.primary_node in bad_nodes:
                   val = None
                 else:
                   val = bool(live_data.get(instance.name))
               elif field == "status":
                 if instance.primary_node in off_nodes:
                   val = "ERROR_nodeoffline"
                 elif instance.primary_node in bad_nodes:
                   val = "ERROR_nodedown"
                 else:
                   running = bool(live_data.get(instance.name))
                   if running:
                     if instance.admin_up:
                       val = "running"
                     else:
                       val = "ERROR_up"
                   else:
                     if instance.admin_up:
                       val = "ERROR_down"
                     else:
                       val = "ADMIN_down"
               elif field == "oper_ram":
                 if instance.primary_node in bad_nodes:
                   val = None
                 elif instance.name in live_data:
                   val = live_data[instance.name].get("memory", "?")
                 else:
                   val = "-"
               elif field == "oper_vcpus":
                 if instance.primary_node in bad_nodes:
                   val = None
                 elif instance.name in live_data:
                   val = live_data[instance.name].get("vcpus", "?")
                 else:
                   val = "-"
               elif field == "vcpus":
                 val = i_be[constants.BE_VCPUS]
               elif field == "disk_template":
                 val = instance.disk_template
               elif field == "ip":
                 if instance.nics:
                   val = instance.nics[0].ip
                 else:
                   val = None
               elif field == "nic_mode":
                 if instance.nics:
                   val = i_nicp[0][constants.NIC_MODE]
                 else:
                   val = None
               elif field == "nic_link":
                 if instance.nics:
                   val = i_nicp[0][constants.NIC_LINK]
                 else:
                   val = None
               elif field == "bridge":
                 if (instance.nics and
                     i_nicp[0][constants.NIC_MODE] == constants.NIC_MODE_BRIDGED):
                   val = i_nicp[0][constants.NIC_LINK]
                 else:
                   val = None
               elif field == "mac":
                 if instance.nics:
                   val = instance.nics[0].mac
                 else:
                   val = None
               elif field == "sda_size" or field == "sdb_size":
                 idx = ord(field[2]) - ord('a')
                 try:
                   val = instance.FindDisk(idx).size
                 except errors.OpPrereqError:
                   val = None
               elif field == "disk_usage": # total disk usage per node
                 disk_sizes = [{'size': disk.size} for disk in instance.disks]
                 val = _ComputeDiskSize(instance.disk_template, disk_sizes)
               elif field == "tags":
                 val = list(instance.GetTags())
               elif field == "hvparams":
                 val = i_hv
               elif (field.startswith(HVPREFIX) and
                     field[len(HVPREFIX):] in constants.HVS_PARAMETERS and
                     field[len(HVPREFIX):] not in constants.HVC_GLOBALS):
                 val = i_hv.get(field[len(HVPREFIX):], None)
               elif field == "beparams":
                 val = i_be
               elif (field.startswith(BEPREFIX) and
                     field[len(BEPREFIX):] in constants.BES_PARAMETERS):
                 val = i_be.get(field[len(BEPREFIX):], None)
               elif st_match and st_match.groups():
                 # matches a variable list
                 st_groups = st_match.groups()
                 if st_groups and st_groups[0] == "disk":
                   if st_groups[1] == "count":
                     val = len(instance.disks)
                   elif st_groups[1] == "sizes":
                     val = [disk.size for disk in instance.disks]
                   elif st_groups[1] == "size":
                     try:
                       val = instance.FindDisk(st_groups[2]).size
                     except errors.OpPrereqError:
                       val = None
                   else:
                     assert False, "Unhandled disk parameter"
                 elif st_groups[0] == "nic":
                   if st_groups[1] == "count":
                     val = len(instance.nics)
                   elif st_groups[1] == "macs":
                     val = [nic.mac for nic in instance.nics]
                   elif st_groups[1] == "ips":
                     val = [nic.ip for nic in instance.nics]
                   elif st_groups[1] == "modes":
                     val = [nicp[constants.NIC_MODE] for nicp in i_nicp]
                   elif st_groups[1] == "links":
                     val = [nicp[constants.NIC_LINK] for nicp in i_nicp]
                   elif st_groups[1] == "bridges":
                     val = []
                     for nicp in i_nicp:
                       if nicp[constants.NIC_MODE] == constants.NIC_MODE_BRIDGED:
                         val.append(nicp[constants.NIC_LINK])
                       else:
                         val.append(None)
                   else:
                     # index-based item
                     nic_idx = int(st_groups[2])
                     if nic_idx >= len(instance.nics):
                       val = None
                     else:
                       if st_groups[1] == "mac":
                         val = instance.nics[nic_idx].mac
                       elif st_groups[1] == "ip":
                         val = instance.nics[nic_idx].ip
                       elif st_groups[1] == "mode":
                         val = i_nicp[nic_idx][constants.NIC_MODE]
                       elif st_groups[1] == "link":
                         val = i_nicp[nic_idx][constants.NIC_LINK]
                       elif st_groups[1] == "bridge":
                         nic_mode = i_nicp[nic_idx][constants.NIC_MODE]
                         if nic_mode == constants.NIC_MODE_BRIDGED:
                           val = i_nicp[nic_idx][constants.NIC_LINK]
                         else:
                           val = None
                       else:
                         assert False, "Unhandled NIC parameter"
                 else:
                   assert False, ("Declared but unhandled variable parameter '%s'" %
                                  field)
               else:
                 assert False, "Declared but unhandled parameter '%s'" % field
               iout.append(val)
             output.append(iout)
           return output
       class LUFailoverInstance(LogicalUnit):
         """Failover an instance.
         """
         HPATH = "instance-failover"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_PARAMS = [
           _PInstanceName,
           ("ignore_consistency", False, _TBool),
           _PShutdownTimeout,
+          ]
         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 BuildHooksEnv(self):
           """Build hooks env.
           This runs on master, primary and secondary nodes of the instance.
           """
           instance = self.instance
           source_node = instance.primary_node
           target_node = instance.secondary_nodes[0]
           env = {
             "IGNORE_CONSISTENCY": self.op.ignore_consistency,
             "SHUTDOWN_TIMEOUT": self.op.shutdown_timeout,
             "OLD_PRIMARY": source_node,
             "OLD_SECONDARY": target_node,
             "NEW_PRIMARY": target_node,
             "NEW_SECONDARY": source_node,
+            }
           env.update(_BuildInstanceHookEnvByObject(self, instance))
           nl = [self.cfg.GetMasterNode()] + list(instance.secondary_nodes)
           nl_post = list(nl)
           nl_post.append(source_node)
           return env, nl, nl_post
         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
           bep = self.cfg.GetClusterInfo().FillBE(instance)
           if instance.disk_template not in constants.DTS_NET_MIRROR:
             raise errors.OpPrereqError("Instance's disk layout is not"
                                        " network mirrored, cannot failover.",
                                        errors.ECODE_STATE)
           secondary_nodes = instance.secondary_nodes
           if not secondary_nodes:
             raise errors.ProgrammerError("no secondary node but using "
                                          "a mirrored disk template")
           target_node = secondary_nodes[0]
           _CheckNodeOnline(self, target_node)
           _CheckNodeNotDrained(self, target_node)
           if instance.admin_up:
             # check memory requirements on the secondary node
             _CheckNodeFreeMemory(self, target_node, "failing over instance %s" %
                                  instance.name, bep[constants.BE_MEMORY],
                                  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):
           """Failover an instance.
           The failover is done by shutting it down on its present node and
           starting it on the secondary.
           """
           instance = self.instance
           source_node = instance.primary_node
           target_node = instance.secondary_nodes[0]
           if instance.admin_up:
             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, dev, target_node, False):
                 if not self.op.ignore_consistency:
                   raise errors.OpExecError("Disk %s is degraded on target node,"
                                            " aborting failover." % dev.iv_name)
           else:
             feedback_fn("* not checking disk consistency as instance is not running")
           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.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))
           feedback_fn("* deactivating the instance's disks on source node")
           if not _ShutdownInstanceDisks(self, 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, feedback_fn)
           # Only start the instance if it's marked as up
           if instance.admin_up:
             feedback_fn("* activating the instance's disks on target node")
             logging.info("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")
             feedback_fn("* starting the instance on the target node")
             result = self.rpc.call_instance_start(target_node, instance, None, None)
             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 LUMigrateInstance(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
         _OP_PARAMS = [
           _PInstanceName,
           _PMigrationMode,
           _PMigrationLive,
           ("cleanup", False, _TBool),
+          ]
         REQ_BGL = False
         def ExpandNames(self):
           self._ExpandAndLockInstance()
           self.needed_locks[locking.LEVEL_NODE] = []
           self.recalculate_locks[locking.LEVEL_NODE] = constants.LOCKS_REPLACE
           self._migrater = TLMigrateInstance(self, self.op.instance_name,
                                              self.op.cleanup)
           self.tasklets = [self._migrater]
         def DeclareLocks(self, level):
           if level == locking.LEVEL_NODE:
             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 = instance.secondary_nodes[0]
           env = _BuildInstanceHookEnvByObject(self, instance)
           env["MIGRATE_LIVE"] = self._migrater.live
           env["MIGRATE_CLEANUP"] = self.op.cleanup
           env.update({
               "OLD_PRIMARY": source_node,
               "OLD_SECONDARY": target_node,
               "NEW_PRIMARY": target_node,
               "NEW_SECONDARY": source_node,
               })
           nl = [self.cfg.GetMasterNode()] + list(instance.secondary_nodes)
           nl_post = list(nl)
           nl_post.append(source_node)
           return env, nl, nl_post
       class LUMoveInstance(LogicalUnit):
         """Move an instance by data-copying.
         """
         HPATH = "instance-move"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_PARAMS = [
           _PInstanceName,
           ("target_node", _NoDefault, _TNonEmptyString),
           _PShutdownTimeout,
+          ]
         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.recalculate_locks[locking.LEVEL_NODE] = constants.LOCKS_APPEND
         def DeclareLocks(self, level):
           if level == locking.LEVEL_NODE:
             self._LockInstancesNodes(primary_only=True)
         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))
           nl = [self.cfg.GetMasterNode()] + [self.instance.primary_node,
                                              self.op.target_node]
           return env, 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)
           if instance.admin_up:
             # check memory requirements on the secondary node
             _CheckNodeFreeMemory(self, target_node, "failing over instance %s" %
                                  instance.name, bep[constants.BE_MEMORY],
                                  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)
           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)
             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_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)
             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 LUMigrateNode(LogicalUnit):
         """Migrate all instances from a node.
         """
         HPATH = "node-migrate"
         HTYPE = constants.HTYPE_NODE
         _OP_PARAMS = [
           _PNodeName,
           _PMigrationMode,
           _PMigrationLive,
+          ]
         REQ_BGL = False
         def ExpandNames(self):
           self.op.node_name = _ExpandNodeName(self.cfg, self.op.node_name)
           self.needed_locks = {
             locking.LEVEL_NODE: [self.op.node_name],
+            }
           self.recalculate_locks[locking.LEVEL_NODE] = constants.LOCKS_APPEND
           # Create tasklets for migrating instances for all instances on this node
           names = []
           tasklets = []
           for inst in _GetNodePrimaryInstances(self.cfg, self.op.node_name):
             logging.debug("Migrating instance %s", inst.name)
             names.append(inst.name)
             tasklets.append(TLMigrateInstance(self, inst.name, False))
           self.tasklets = tasklets
           # Declare instance locks
           self.needed_locks[locking.LEVEL_INSTANCE] = names
         def DeclareLocks(self, level):
           if level == locking.LEVEL_NODE:
             self._LockInstancesNodes()
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on the master, the primary and all the secondaries.
           """
           env = {
             "NODE_NAME": self.op.node_name,
+            }
           nl = [self.cfg.GetMasterNode()]
           return (env, nl, nl)
       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
         """
         def __init__(self, lu, instance_name, cleanup):
           """Initializes this class.
           """
           Tasklet.__init__(self, lu)
           # Parameters
           self.instance_name = instance_name
           self.cleanup = cleanup
           self.live = False # will be overridden later
         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
           if instance.disk_template != constants.DT_DRBD8:
             raise errors.OpPrereqError("Instance's disk layout is not"
                                        " drbd8, cannot migrate.", errors.ECODE_STATE)
           secondary_nodes = instance.secondary_nodes
           if not secondary_nodes:
             raise errors.ConfigurationError("No secondary node but using"
                                             " drbd8 disk template")
           i_be = self.cfg.GetClusterInfo().FillBE(instance)
           target_node = secondary_nodes[0]
           # check memory requirements on the secondary node
           _CheckNodeFreeMemory(self.lu, target_node, "migrating instance %s" %
                                instance.name, i_be[constants.BE_MEMORY],
                                instance.hypervisor)
           # check bridge existance
           _CheckInstanceBridgesExist(self.lu, instance, node=target_node)
           if not self.cleanup:
             _CheckNodeNotDrained(self.lu, target_node)
             result = self.rpc.call_instance_migratable(instance.primary_node,
                                                        instance)
             result.Raise("Can't migrate, please use failover",
                          prereq=True, ecode=errors.ECODE_STATE)
           self.instance = instance
           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(instance, skip_globals=False)
             self.lu.op.mode = i_hv[constants.HV_MIGRATION_MODE]
           self.live = self.lu.op.mode == constants.HT_MIGRATION_LIVE
         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
           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
           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: error '%s'\n"
                                "Please look and recover the instance status" %
                                str(err))
         def _AbortMigration(self):
           """Call the hypervisor code to abort a started migration.
           """
           instance = self.instance
           target_node = self.target_node
           migration_info = self.migration_info
           abort_result = self.rpc.call_finalize_migration(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.
         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
           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 migrate." % 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
           # 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)
           time.sleep(10)
           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))
           time.sleep(10)
           instance.primary_node = target_node
           # distribute new instance config to the other nodes
           self.cfg.Update(instance, self.feedback_fn)
           result = self.rpc.call_finalize_migration(target_node,
                                                     instance,
                                                     migration_info,
                                                     True)
           msg = result.fail_msg
           if msg:
             logging.error("Instance migration succeeded, but finalization failed:"
                           " %s", msg)
             raise errors.OpExecError("Could not finalize instance migration: %s" %
                                      msg)
           self._EnsureSecondary(source_node)
           self._WaitUntilSync()
           self._GoStandalone()
           self._GoReconnect(False)
           self._WaitUntilSync()
           self.feedback_fn("* done")
         def Exec(self, feedback_fn):
           """Perform the migration.
           """
           feedback_fn("Migrating instance %s" % self.instance.name)
           self.feedback_fn = feedback_fn
           self.source_node = self.instance.primary_node
           self.target_node = self.instance.secondary_nodes[0]
           self.all_nodes = [self.source_node, self.target_node]
           self.nodes_ip = {
             self.source_node: self.cfg.GetNodeInfo(self.source_node).secondary_ip,
             self.target_node: self.cfg.GetNodeInfo(self.target_node).secondary_ip,
+            }
           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 _GenerateDRBD8Branch(lu, primary, secondary, size, names, iv_name,
                                p_minor, s_minor):
         """Generate a drbd8 device complete with its children.
         """
         port = lu.cfg.AllocatePort()
         vgname = lu.cfg.GetVGName()
         shared_secret = lu.cfg.GenerateDRBDSecret(lu.proc.GetECId())
         dev_data = objects.Disk(dev_type=constants.LD_LV, size=size,
                                 logical_id=(vgname, names[0]))
         dev_meta = objects.Disk(dev_type=constants.LD_LV, size=128,
                                 logical_id=(vgname, names[1]))
         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)
         return drbd_dev
       def _GenerateDiskTemplate(lu, template_name,
                                 instance_name, primary_node,
                                 secondary_nodes, disk_info,
                                 file_storage_dir, file_driver,
                                 base_index):
         """Generate the entire disk layout for a given template type.
         """
         #TODO: compute space requirements
         vgname = lu.cfg.GetVGName()
         disk_count = len(disk_info)
         disks = []
         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
             disk_dev = objects.Disk(dev_type=constants.LD_LV, size=disk["size"],
                                     logical_id=(vgname, names[idx]),
                                     iv_name="disk/%d" % disk_index,
                                     mode=disk["mode"])
             disks.append(disk_dev)
         elif template_name == constants.DT_DRBD8:
           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
             disk_dev = _GenerateDRBD8Branch(lu, primary_node, remote_node,
                                             disk["size"], names[idx*2:idx*2+2],
                                             "disk/%d" % disk_index,
                                             minors[idx*2], minors[idx*2+1])
             disk_dev.mode = disk["mode"]
             disks.append(disk_dev)
         elif template_name == constants.DT_FILE:
           if len(secondary_nodes) != 0:
             raise errors.ProgrammerError("Wrong template configuration")
           _RequireFileStorage()
           for idx, disk in enumerate(disk_info):
             disk_index = idx + base_index
             disk_dev = objects.Disk(dev_type=constants.LD_FILE, size=disk["size"],
                                     iv_name="disk/%d" % disk_index,
                                     logical_id=(file_driver,
                                                 "%s/disk%d" % (file_storage_dir,
                                                                disk_index)),
                                     mode=disk["mode"])
             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 _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 == constants.DT_FILE:
           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
         # LUSetInstanceParams
         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 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 _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["size"] for d in disks),
           # 128 MB are added for drbd metadata for each disk
           constants.DT_DRBD8: sum(d["size"] + 128 for d in disks),
           constants.DT_FILE: None,
+        }
         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 _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
         """
         hvinfo = lu.rpc.call_hypervisor_validate_params(nodenames,
                                                         hvname,
                                                         hvparams)
         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
         """
         result = lu.rpc.call_os_validate(required, nodenames, 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 LUCreateInstance(LogicalUnit):
         """Create an instance.
         """
         HPATH = "instance-add"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_PARAMS = [
           _PInstanceName,
           ("mode", _NoDefault, _TElemOf(constants.INSTANCE_CREATE_MODES)),
           ("start", True, _TBool),
           ("wait_for_sync", True, _TBool),
           ("ip_check", True, _TBool),
           ("name_check", True, _TBool),
           ("disks", _NoDefault, _TListOf(_TDict)),
           ("nics", _NoDefault, _TListOf(_TDict)),
           ("hvparams", _EmptyDict, _TDict),
           ("beparams", _EmptyDict, _TDict),
           ("osparams", _EmptyDict, _TDict),
           ("no_install", None, _TMaybeBool),
           ("os_type", None, _TMaybeString),
           ("force_variant", False, _TBool),
           ("source_handshake", None, _TOr(_TList, _TNone)),
           ("source_x509_ca", None, _TMaybeString),
           ("source_instance_name", None, _TMaybeString),
           ("src_node", None, _TMaybeString),
           ("src_path", None, _TMaybeString),
           ("pnode", None, _TMaybeString),
           ("snode", None, _TMaybeString),
           ("iallocator", None, _TMaybeString),
           ("hypervisor", None, _TMaybeString),
           ("disk_template", _NoDefault, _CheckDiskTemplate),
           ("identify_defaults", False, _TBool),
           ("file_driver", None, _TOr(_TNone, _TElemOf(constants.FILE_DRIVER))),
           ("file_storage_dir", None, _TMaybeString),
+          ]
         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.HostInfo.NormalizeName(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 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 "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)
           self.adopt_disks = has_adopt
           # instance name verification
           if self.op.name_check:
             self.hostname1 = netutils.GetHostInfo(self.op.instance_name)
             self.op.instance_name = self.hostname1.name
             # used in CheckPrereq for ip ping check
             self.check_ip = self.hostname1.ip
           elif self.op.mode == constants.INSTANCE_REMOTE_IMPORT:
             raise errors.OpPrereqError("Remote imports require names to be checked" %
                                        errors.ECODE_INVAL)
           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.file_storage_dir and os.path.isabs(self.op.file_storage_dir):
             raise errors.OpPrereqError("File storage directory path not absolute",
                                        errors.ECODE_INVAL)
           ### Node/iallocator related checks
           _CheckIAllocatorOrNode(self, "iallocator", "pnode")
           if self.op.pnode is not None:
             if self.op.disk_template in constants.DTS_NET_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_oss:
               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)
             norm_name = netutils.HostInfo.NormalizeName(src_instance_name)
             self.source_instance_name = netutils.GetHostInfo(norm_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:
             self.needed_locks[locking.LEVEL_NODE] = 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
           # 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 an absolute"
                                            " 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=[],
                            os=self.op.os_type,
                            vcpus=self.be_full[constants.BE_VCPUS],
                            mem_size=self.be_full[constants.BE_MEMORY],
                            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,
             memory=self.be_full[constants.BE_MEMORY],
             vcpus=self.be_full[constants.BE_VCPUS],
             nics=_NICListToTuple(self, self.nics),
             disk_template=self.op.disk_template,
             disks=[(d["size"], d["mode"]) for d in self.disks],
             bep=self.be_full,
             hvp=self.hv_full,
             hypervisor_name=self.op.hypervisor,
           ))
           nl = ([self.cfg.GetMasterNode(), self.op.pnode] +
                 self.secondaries)
           return env, 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.acquired_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")
             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:
             if einfo.has_option(constants.INISECT_INS, "disk_count"):
               disks = []
               # TODO: import the disk iv_name too
               for idx in range(einfo.getint(constants.INISECT_INS, "disk_count")):
                 disk_sz = einfo.getint(constants.INISECT_INS, "disk%d_size" % idx)
                 disks.append({"size": disk_sz})
               self.op.disks = disks
             else:
               raise errors.OpPrereqError("No disk info specified and the export"
                                          " is missing the disk information",
                                          errors.ECODE_INVAL)
           if (not self.op.nics and
               einfo.has_option(constants.INISECT_INS, "nic_count")):
             nics = []
             for idx in range(einfo.getint(constants.INISECT_INS, "nic_count")):
               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)
             self.op.nics = nics
           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
           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 CheckPrereq(self):
           """Check prerequisites.
           """
           if self.op.mode == constants.INSTANCE_IMPORT:
             export_info = self._ReadExportInfo()
             self._ReadExportParams(export_info)
           _CheckDiskTemplate(self.op.disk_template)
           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:
             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 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
           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("mode", None)
             nic_mode = nic_mode_req
             if nic_mode is None:
               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("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. Aborting.",
                                            errors.ECODE_INVAL)
               nic_ip = self.hostname1.ip
             else:
               if not netutils.IsValidIP4(ip):
                 raise errors.OpPrereqError("Given IP address '%s' doesn't look"
                                            " like a valid IP" % 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("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)
             # bridge verification
             bridge = nic.get("bridge", None)
             link = nic.get("link", None)
             if bridge and link:
               raise errors.OpPrereqError("Cannot pass 'bridge' and 'link'"
                                          " at the same time", errors.ECODE_INVAL)
             elif bridge and nic_mode == constants.NIC_MODE_ROUTED:
               raise errors.OpPrereqError("Cannot pass 'bridge' on a routed nic",
                                          errors.ECODE_INVAL)
             elif bridge:
               link = bridge
             nicparams = {}
             if nic_mode_req:
               nicparams[constants.NIC_MODE] = nic_mode_req
             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
           self.disks = []
           for disk in self.op.disks:
             mode = disk.get("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("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)
             new_disk = {"size": size, "mode": mode}
             if "adopt" in disk:
               new_disk["adopt"] = disk["adopt"]
             self.disks.append(new_disk)
           if self.op.mode == constants.INSTANCE_IMPORT:
             # Check that the new instance doesn't have less disks than the export
             instance_disks = len(self.disks)
             export_disks = export_info.getint(constants.INISECT_INS, 'disk_count')
             if instance_disks < export_disks:
               raise errors.OpPrereqError("Not enough disks to import."
                                          " (instance: %d, export: %d)" %
                                          (instance_disks, export_disks),
                                          errors.ECODE_INVAL)
             disk_images = []
             for idx in range(export_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')
             try:
               exp_nic_count = export_info.getint(constants.INISECT_INS, 'nic_count')
             except (TypeError, ValueError), err:
               raise errors.OpPrereqError("Invalid export file, nic_count is not"
                                          " an integer: %s" % str(err),
                                          errors.ECODE_STATE)
             if self.op.instance_name == old_name:
               for idx, nic in enumerate(self.nics):
                 if nic.mac == constants.VALUE_AUTO and exp_nic_count >= idx:
                   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()
           #### 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)
           self.secondaries = []
           # mirror node verification
           if self.op.disk_template in constants.DTS_NET_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)
             self.secondaries.append(self.op.snode)
           nodenames = [pnode.name] + self.secondaries
           req_size = _ComputeDiskSize(self.op.disk_template,
                                       self.disks)
           # Check lv size requirements, if not adopting
           if req_size is not None and not self.adopt_disks:
             _CheckNodesFreeDisk(self, nodenames, req_size)
           if self.adopt_disks: # instead, we must check the adoption data
             all_lvs = set([i["adopt"] for i 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:
                 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)
             node_lvs = self.rpc.call_lv_list([pnode.name],
                                              self.cfg.GetVGName())[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["size"] = int(float(node_lvs[dsk["adopt"]][0]))
           _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
           if self.op.start:
             _CheckNodeFreeMemory(self, self.pnode.name,
                                  "creating instance %s" % self.op.instance_name,
                                  self.be_full[constants.BE_MEMORY],
                                  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
           ht_kind = self.op.hypervisor
           if ht_kind in constants.HTS_REQ_PORT:
             network_port = self.cfg.AllocatePort()
           else:
             network_port = None
           if constants.ENABLE_FILE_STORAGE:
             # this is needed because os.path.join does not accept None arguments
             if self.op.file_storage_dir is None:
               string_file_storage_dir = ""
             else:
               string_file_storage_dir = self.op.file_storage_dir
             # build the full file storage dir path
             file_storage_dir = utils.PathJoin(self.cfg.GetFileStorageDir(),
                                               string_file_storage_dir, instance)
           else:
             file_storage_dir = ""
           disks = _GenerateDiskTemplate(self,
                                         self.op.disk_template,
                                         instance, pnode_name,
                                         self.secondaries,
                                         self.disks,
                                         file_storage_dir,
                                         self.op.file_driver,
 )
           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_up=False,
                                   network_port=network_port,
                                   beparams=self.op.beparams,
                                   hvparams=self.op.hvparams,
                                   hypervisor=self.op.hypervisor,
                                   osparams=self.op.osparams,
+                                  )
           if self.adopt_disks:
             # 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["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]
           # Unlock all the nodes
           if self.op.mode == constants.INSTANCE_IMPORT:
             nodes_keep = [self.op.src_node]
             nodes_release = [node for node in self.acquired_locks[locking.LEVEL_NODE]
                              if node != self.op.src_node]
             self.context.glm.release(locking.LEVEL_NODE, nodes_release)
             self.acquired_locks[locking.LEVEL_NODE] = nodes_keep
           else:
             self.context.glm.release(locking.LEVEL_NODE)
             del self.acquired_locks[locking.LEVEL_NODE]
           if self.op.wait_for_sync:
             disk_abort = not _WaitForSync(self, iobj)
           elif iobj.disk_template in constants.DTS_NET_MIRROR:
             # make sure the disks are not degraded (still sync-ing is ok)
             time.sleep(15)
             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")
           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:
                 feedback_fn("* running the instance OS create scripts...")
                 # FIXME: pass debug option from opcode to backend
                 result = self.rpc.call_instance_os_add(pnode_name, iobj, False,
                                                        self.op.debug_level)
                 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...")
               connect_timeout = constants.RIE_CONNECT_TIMEOUT
               timeouts = masterd.instance.ImportExportTimeouts(connect_timeout)
               disk_results = masterd.instance.RemoteImport(self, feedback_fn, iobj,
                                                            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)
           if self.op.start:
             iobj.admin_up = True
             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)
             result.Raise("Could not start instance")
           return list(iobj.all_nodes)
       class LUConnectConsole(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.
         """
         _OP_PARAMS = [
           _PInstanceName
+          ]
         REQ_BGL = False
         def ExpandNames(self):
           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:
             raise errors.OpExecError("Instance %s is not running." % instance.name)
           logging.debug("Connecting to console of %s on %s", instance.name, node)
           hyper = hypervisor.GetHypervisor(instance.hypervisor)
           cluster = self.cfg.GetClusterInfo()
           # 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_cmd = hyper.GetShellCommandForConsole(instance, hvparams, beparams)
           # build ssh cmdline
           return self.ssh.BuildCmd(node, "root", console_cmd, batch=True, tty=True)
       class LUReplaceDisks(LogicalUnit):
         """Replace the disks of an instance.
         """
         HPATH = "mirrors-replace"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_PARAMS = [
           _PInstanceName,
           ("mode", _NoDefault, _TElemOf(constants.REPLACE_MODES)),
           ("disks", _EmptyList, _TListOf(_TPositiveInt)),
           ("remote_node", None, _TMaybeString),
           ("iallocator", None, _TMaybeString),
           ("early_release", False, _TBool),
+          ]
         REQ_BGL = False
         def CheckArguments(self):
           TLReplaceDisks.CheckArguments(self.op.mode, self.op.remote_node,
                                         self.op.iallocator)
         def ExpandNames(self):
           self._ExpandAndLockInstance()
           if self.op.iallocator is not None:
             self.needed_locks[locking.LEVEL_NODE] = locking.ALL_SET
           elif self.op.remote_node is not None:
             remote_node = _ExpandNodeName(self.cfg, self.op.remote_node)
             self.op.remote_node = 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] = [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
           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 we're not already locking all nodes in the set we have to declare the
           # instance's primary/secondary nodes.
           if (level == locking.LEVEL_NODE and
               self.needed_locks[locking.LEVEL_NODE] is not locking.ALL_SET):
             self._LockInstancesNodes()
         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))
           nl = [
             self.cfg.GetMasterNode(),
             instance.primary_node,
+            ]
           if self.op.remote_node is not None:
             nl.append(self.op.remote_node)
           return env, nl, nl
       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=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):
           return _FindFaultyInstanceDisks(self.cfg, self.rpc, self.instance,
                                           node_name, 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 not None:
             self.remote_node_info = self.cfg.GetNodeInfo(remote_node)
             assert self.remote_node_info is not None, \
               "Cannot retrieve locked node %s" % remote_node
           else:
             self.remote_node_info = None
           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:
             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)
               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))
           for node in check_nodes:
             _CheckNodeOnline(self.lu, node)
           # Check whether disks are valid
           for disk_idx in self.disks:
             instance.FindDisk(disk_idx)
           # Get secondary node IP addresses
           node_2nd_ip = {}
           for node_name in [self.target_node, self.other_node, self.new_node]:
             if node_name is not None:
               node_2nd_ip[node_name] = self.cfg.GetNodeInfo(node_name).secondary_ip
           self.node_secondary_ip = node_2nd_ip
         def Exec(self, feedback_fn):
           """Execute disk replacement.
           This dispatches the disk replacement to the appropriate handler.
           """
           if self.delay_iallocator:
             self._CheckPrereq2()
           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 = (not self.instance.admin_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
             return 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)
         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):
           vgname = self.cfg.GetVGName()
           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)
             lv_data = objects.Disk(dev_type=constants.LD_LV, size=dev.size,
                                    logical_id=(vgname, names[0]))
             lv_meta = objects.Disk(dev_type=constants.LD_LV, size=128,
                                    logical_id=(vgname, names[1]))
             new_lvs = [lv_data, lv_meta]
             old_lvs = 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 _ReleaseNodeLock(self, node_name):
           """Releases the lock for a given node."""
           self.lu.context.glm.release(locking.LEVEL_NODE, node_name)
         def _ExecDrbd8DiskOnly(self, feedback_fn):
           """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)
             for old, new in zip(old_lvs, new_lvs):
               new.logical_id = old.logical_id
               self.cfg.SetDiskID(new, self.target_node)
             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)
             dev.children = new_lvs
             self.cfg.Update(self.instance, feedback_fn)
           cstep = 5
           if self.early_release:
             self.lu.LogStep(cstep, steps_total, "Removing old storage")
             cstep += 1
             self._RemoveOldStorage(self.target_node, iv_names)
             # WARNING: we release both node locks here, do not do other RPCs
             # than WaitForSync to the primary node
             self._ReleaseNodeLock([self.target_node, self.other_node])
           # 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, steps_total, "Sync devices")
           cstep += 1
           _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, steps_total, "Removing old storage")
             cstep += 1
             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
           # 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)
             new_drbd = objects.Disk(dev_type=constants.LD_DRBD8,
                                     logical_id=new_alone_id,
                                     children=dev.children,
                                     size=dev.size)
             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([self.instance.primary_node],
                                                      self.node_secondary_ip,
                                                      self.instance.disks)\
                                                     [self.instance.primary_node]
           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)
           # 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 = 5
           if self.early_release:
             self.lu.LogStep(cstep, steps_total, "Removing old storage")
             cstep += 1
             self._RemoveOldStorage(self.target_node, iv_names)
             # WARNING: we release all node locks here, do not do other RPCs
             # than WaitForSync to the primary node
             self._ReleaseNodeLock([self.instance.primary_node,
                                    self.target_node,
                                    self.new_node])
           # 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, steps_total, "Sync devices")
           cstep += 1
           _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, steps_total, "Removing old storage")
             self._RemoveOldStorage(self.target_node, iv_names)
       class LURepairNodeStorage(NoHooksLU):
         """Repairs the volume group on a node.
         """
         _OP_PARAMS = [
           _PNodeName,
           ("storage_type", _NoDefault, _CheckStorageType),
           ("name", _NoDefault, _TNonEmptyString),
           ("ignore_consistency", False, _TBool),
+          ]
         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 not inst.admin_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 LUNodeEvacuationStrategy(NoHooksLU):
         """Computes the node evacuation strategy.
         """
         _OP_PARAMS = [
           ("nodes", _NoDefault, _TListOf(_TNonEmptyString)),
           ("remote_node", None, _TMaybeString),
           ("iallocator", None, _TMaybeString),
+          ]
         REQ_BGL = False
         def CheckArguments(self):
           _CheckIAllocatorOrNode(self, "iallocator", "remote_node")
         def ExpandNames(self):
           self.op.nodes = _GetWantedNodes(self, self.op.nodes)
           self.needed_locks = locks = {}
           if self.op.remote_node is None:
             locks[locking.LEVEL_NODE] = locking.ALL_SET
           else:
             self.op.remote_node = _ExpandNodeName(self.cfg, self.op.remote_node)
             locks[locking.LEVEL_NODE] = self.op.nodes + [self.op.remote_node]
         def Exec(self, feedback_fn):
           if self.op.remote_node is not None:
             instances = []
             for node in self.op.nodes:
               instances.extend(_GetNodeSecondaryInstances(self.cfg, node))
             result = []
             for i in 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)
               result.append([i.name, self.op.remote_node])
           else:
             ial = IAllocator(self.cfg, self.rpc,
                              mode=constants.IALLOCATOR_MODE_MEVAC,
                              evac_nodes=self.op.nodes)
             ial.Run(self.op.iallocator, validate=True)
             if not ial.success:
               raise errors.OpExecError("No valid evacuation solution: %s" % ial.info,
                                        errors.ECODE_NORES)
             result = ial.result
           return result
       class LUGrowDisk(LogicalUnit):
         """Grow a disk of an instance.
         """
         HPATH = "disk-grow"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_PARAMS = [
           _PInstanceName,
           ("disk", _NoDefault, _TInt),
           ("amount", _NoDefault, _TInt),
           ("wait_for_sync", True, _TBool),
+          ]
         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 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))
           nl = [self.cfg.GetMasterNode()] + list(self.instance.all_nodes)
           return env, 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 != constants.DT_FILE:
             # TODO: check the free disk space for file, when that feature will be
             # supported
             _CheckNodesFreeDisk(self, nodenames, self.op.amount)
         def Exec(self, feedback_fn):
           """Execute disk grow.
           """
           instance = self.instance
           disk = self.disk
           disks_ok, _ = _AssembleInstanceDisks(self, self.instance, disks=[disk])
           if not disks_ok:
             raise errors.OpExecError("Cannot activate block device to grow")
           for node in instance.all_nodes:
             self.cfg.SetDiskID(disk, node)
             result = self.rpc.call_blockdev_grow(node, disk, self.op.amount)
             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)
           if self.op.wait_for_sync:
             disk_abort = not _WaitForSync(self, instance, disks=[disk])
             if disk_abort:
               self.proc.LogWarning("Warning: disk sync-ing has not returned a good"
                                    " status.\nPlease check the instance.")
             if not instance.admin_up:
               _SafeShutdownInstanceDisks(self, instance, disks=[disk])
           elif not instance.admin_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.")
       class LUQueryInstanceData(NoHooksLU):
         """Query runtime instance data.
         """
         _OP_PARAMS = [
           ("instances", _EmptyList, _TListOf(_TNonEmptyString)),
           ("static", False, _TBool),
+          ]
         REQ_BGL = False
         def ExpandNames(self):
           self.needed_locks = {}
           self.share_locks = dict.fromkeys(locking.LEVELS, 1)
           if self.op.instances:
             self.wanted_names = []
             for name in self.op.instances:
               full_name = _ExpandInstanceName(self.cfg, name)
               self.wanted_names.append(full_name)
             self.needed_locks[locking.LEVEL_INSTANCE] = self.wanted_names
           else:
             self.wanted_names = None
             self.needed_locks[locking.LEVEL_INSTANCE] = locking.ALL_SET
           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 only checks the optional instance list against the existing names.
           """
           if self.wanted_names is None:
             self.wanted_names = self.acquired_locks[locking.LEVEL_INSTANCE]
           self.wanted_instances = [self.cfg.GetInstanceInfo(name) for name
                                    in 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 = [self._ComputeDiskStatus(instance, snode, child)
                             for child in dev.children]
           else:
             dev_children = []
           data = {
             "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,
+            }
           return data
         def Exec(self, feedback_fn):
           """Gather and return data"""
           result = {}
           cluster = self.cfg.GetClusterInfo()
           for instance in self.wanted_instances:
             if not self.op.static:
               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:
                 remote_state = "down"
             else:
               remote_state = None
             if instance.admin_up:
               config_state = "up"
             else:
               config_state = "down"
             disks = [self._ComputeDiskStatus(instance, None, device)
                      for device in instance.disks]
             idict = {
               "name": instance.name,
               "config_state": config_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,
+              }
             result[instance.name] = idict
           return result
       class LUSetInstanceParams(LogicalUnit):
         """Modifies an instances's parameters.
         """
         HPATH = "instance-modify"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_PARAMS = [
           _PInstanceName,
           ("nics", _EmptyList, _TList),
           ("disks", _EmptyList, _TList),
           ("beparams", _EmptyDict, _TDict),
           ("hvparams", _EmptyDict, _TDict),
           ("disk_template", None, _TMaybeString),
           ("remote_node", None, _TMaybeString),
           ("os_name", None, _TMaybeString),
           ("force_variant", False, _TBool),
           ("osparams", None, _TOr(_TDict, _TNone)),
           _PForce,
+          ]
         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):
             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('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('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['size'] = size
             else:
               # modification of disk
               if '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:
             _CheckDiskTemplate(self.op.disk_template)
             if (self.op.disk_template in constants.DTS_NET_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('ip', None)
             if nic_ip is not None:
               if nic_ip.lower() == constants.VALUE_NONE:
                 nic_dict['ip'] = None
               else:
                 if not netutils.IsValidIP4(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('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['link'] = None
             if nic_op == constants.DDM_ADD:
               nic_mac = nic_dict.get('mac', None)
               if nic_mac is None:
                 nic_dict['mac'] = constants.VALUE_AUTO
             if 'mac' in nic_dict:
               nic_mac = nic_dict['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()
           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()
             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)
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on the master, primary and secondaries.
           """
           args = dict()
           if constants.BE_MEMORY in self.be_new:
             args['memory'] = self.be_new[constants.BE_MEMORY]
           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 'ip' in this_nic_override:
                 ip = this_nic_override['ip']
               else:
                 ip = nic.ip
               if 'mac' in this_nic_override:
                 mac = this_nic_override['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('ip', None)
               mac = nic_override[constants.DDM_ADD]['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
           nl = [self.cfg.GetMasterNode()] + list(self.instance.all_nodes)
           return env, 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)
           # 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)
             _CheckInstanceDown(self, instance, "cannot change disk template")
             if self.op.disk_template in constants.DTS_NET_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)
               disks = [{"size": d.size} for d in instance.disks]
               required = _ComputeDiskSize(self.op.disk_template, disks)
               _CheckNodesFreeDisk(self, [self.op.remote_node], required)
           # 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_new = hv_new # the new actual values
             self.hv_inst = i_hvdict # the new dict (without defaults)
           else:
             self.hv_new = self.hv_inst = {}
           # beparams processing
           if self.op.beparams:
             i_bedict = _GetUpdatedParams(instance.beparams, self.op.beparams,
                                          use_none=True)
             utils.ForceDictType(i_bedict, constants.BES_PARAMETER_TYPES)
             be_new = cluster.SimpleFillBE(i_bedict)
             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 = {}
           # osparams processing
           if self.op.osparams:
             i_osdict = _GetUpdatedParams(instance.osparams, self.op.osparams)
             _CheckOSParams(self, True, nodelist, instance_os, i_osdict)
             self.os_new = cluster.SimpleFillOS(instance_os, i_osdict)
             self.os_inst = i_osdict # the new dict (without defaults)
           else:
             self.os_new = self.os_inst = {}
           self.warn = []
           if constants.BE_MEMORY in self.op.beparams and not self.op.force:
             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, self.cfg.GetVGName(),
                                                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))
             elif not isinstance(pninfo.payload.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)
                 current_mem = 0
               miss_mem = (be_new[constants.BE_MEMORY] - current_mem -
                           pninfo.payload['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
                 msg = nres.fail_msg
                 if msg:
                   self.warn.append("Can't get info from secondary node %s: %s" %
                                    (node, msg))
                 elif not isinstance(nres.payload.get('memory_free', None), int):
                   self.warn.append("Secondary node %s didn't return free"
                                    " memory information" % node)
                 elif be_new[constants.BE_MEMORY] > nres.payload['memory_free']:
                   self.warn.append("Not enough memory to failover instance to"
                                    " secondary node %s" % node)
           # 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 'ip' in nic_dict:
                 nic_ip = nic_dict['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 'mac' in nic_dict:
               nic_mac = nic_dict['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['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)
               _CheckInstanceDown(self, instance, "cannot remove disks")
             if (disk_op == constants.DDM_ADD and
                 len(instance.nics) >= 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)
           return
         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
           # create a fake disk info for _GenerateDiskTemplate
           disk_info = [{"size": d.size, "mode": d.mode} for d in instance.disks]
           new_disks = _GenerateDiskTemplate(self, self.op.disk_template,
                                             instance.name, pnode, [snode],
                                             disk_info, None, None, 0)
           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)
           # disks are created, waiting for sync
           disk_abort = not _WaitForSync(self, instance)
           if disk_abort:
             raise errors.OpExecError("There are some degraded disks for"
                                      " this instance, please cleanup manually")
         def _ConvertDrbdToPlain(self, feedback_fn):
           """Converts an instance from drbd to plain.
           """
           instance = self.instance
           assert len(instance.secondary_nodes) == 1
           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)
           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)
         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)
           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"))
             elif disk_op == constants.DDM_ADD:
               # add a new disk
               if instance.disk_template == constants.DT_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)[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['mode']
               result.append(("disk.mode/%d" % disk_op, disk_dict['mode']))
           if self.op.disk_template:
             r_shut = _ShutdownInstanceDisks(self, instance)
             if not r_shut:
               raise errors.OpExecError("Cannot shutdow 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))
           # 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['mac']
               ip = nic_dict.get('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 'mac', '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))
           self.cfg.Update(instance, feedback_fn)
           return result
         _DISK_CONVERSIONS = {
           (constants.DT_PLAIN, constants.DT_DRBD8): _ConvertPlainToDrbd,
           (constants.DT_DRBD8, constants.DT_PLAIN): _ConvertDrbdToPlain,
+          }
       class LUQueryExports(NoHooksLU):
         """Query the exports list
         """
         _OP_PARAMS = [
           ("nodes", _EmptyList, _TListOf(_TNonEmptyString)),
           ("use_locking", False, _TBool),
+          ]
         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.acquired_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 LUPrepareExport(NoHooksLU):
         """Prepares an instance for an export and returns useful information.
         """
         _OP_PARAMS = [
           _PInstanceName,
           ("mode", _NoDefault, _TElemOf(constants.EXPORT_MODES)),
+          ]
         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 LUExportInstance(LogicalUnit):
         """Export an instance to an image in the cluster.
         """
         HPATH = "instance-export"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_PARAMS = [
           _PInstanceName,
           ("target_node", _NoDefault, _TOr(_TNonEmptyString, _TList)),
           ("shutdown", True, _TBool),
           _PShutdownTimeout,
           ("remove_instance", False, _TBool),
           ("ignore_remove_failures", False, _TBool),
           ("mode", constants.EXPORT_MODE_LOCAL, _TElemOf(constants.EXPORT_MODES)),
           ("x509_key_name", None, _TOr(_TList, _TNone)),
           ("destination_x509_ca", None, _TMaybeString),
+          ]
         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.remove_instance and not self.op.shutdown:
             raise errors.OpPrereqError("Can not remove instance without shutting it"
                                        " down before")
           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))
           nl = [self.cfg.GetMasterNode(), self.instance.primary_node]
           if self.op.mode == constants.EXPORT_MODE_LOCAL:
             nl.append(self.op.target_node)
           return env, 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.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 OpQueryExports
           # 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 = (not instance.admin_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_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)
                 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 LURemoveExport(NoHooksLU):
         """Remove exports related to the named instance.
         """
         _OP_PARAMS = [
           _PInstanceName,
+          ]
         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.acquired_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 TagsLU(NoHooksLU): # pylint: disable-msg=W0223
         """Generic tags LU.
         This is an abstract class which is the parent of all the other tags LUs.
         """
         def ExpandNames(self):
           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
         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)
           else:
             raise errors.OpPrereqError("Wrong tag type requested (%s)" %
                                        str(self.op.kind), errors.ECODE_INVAL)
       class LUGetTags(TagsLU):
         """Returns the tags of a given object.
         """
         _OP_PARAMS = [
           ("kind", _NoDefault, _TElemOf(constants.VALID_TAG_TYPES)),
           # Name is only meaningful for nodes and instances
           ("name", _NoDefault, _TMaybeString),
+          ]
         REQ_BGL = False
         def Exec(self, feedback_fn):
           """Returns the tag list.
           """
           return list(self.target.GetTags())
       class LUSearchTags(NoHooksLU):
         """Searches the tags for a given pattern.
         """
         _OP_PARAMS = [
           ("pattern", _NoDefault, _TNonEmptyString),
+          ]
         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])
           results = []
           for path, target in tgts:
             for tag in target.GetTags():
               if self.re.search(tag):
                 results.append((path, tag))
           return results
       class LUAddTags(TagsLU):
         """Sets a tag on a given object.
         """
         _OP_PARAMS = [
           ("kind", _NoDefault, _TElemOf(constants.VALID_TAG_TYPES)),
           # Name is only meaningful for nodes and instances
           ("name", _NoDefault, _TMaybeString),
           ("tags", _NoDefault, _TListOf(_TNonEmptyString)),
+          ]
         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 LUDelTags(TagsLU):
         """Delete a list of tags from a given object.
         """
         _OP_PARAMS = [
           ("kind", _NoDefault, _TElemOf(constants.VALID_TAG_TYPES)),
           # Name is only meaningful for nodes and instances
           ("name", _NoDefault, _TMaybeString),
           ("tags", _NoDefault, _TListOf(_TNonEmptyString)),
+          ]
         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()
           if not del_tags <= cur_tags:
             diff_tags = del_tags - cur_tags
             diff_names = ["'%s'" % tag for tag in diff_tags]
             diff_names.sort()
             raise errors.OpPrereqError("Tag(s) %s not found" %
                                        (",".join(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.
         """
         _OP_PARAMS = [
           ("duration", _NoDefault, _TFloat),
           ("on_master", True, _TBool),
           ("on_nodes", _EmptyList, _TListOf(_TNonEmptyString)),
           ("repeat", 0, _TPositiveInt)
+          ]
         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 LUTestJobqueue(NoHooksLU):
         """Utility LU to test some aspects of the job queue.
         """
         _OP_PARAMS = [
           ("notify_waitlock", False, _TBool),
           ("notify_exec", False, _TBool),
           ("log_messages", _EmptyList, _TListOf(_TString)),
           ("fail", False, _TBool),
+          ]
         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-msg=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-msg=R0902
         # lots of instance attributes
         _ALLO_KEYS = [
           "name", "mem_size", "disks", "disk_template",
           "os", "tags", "nics", "vcpus", "hypervisor",
+          ]
         _RELO_KEYS = [
           "name", "relocate_from",
+          ]
         _EVAC_KEYS = [
           "evac_nodes",
+          ]
         def __init__(self, cfg, rpc, mode, **kwargs):
           self.cfg = cfg
           self.rpc = rpc
           # 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.mem_size = 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.evac_nodes = None
           # computed fields
           self.required_nodes = None
           # init result fields
           self.success = self.info = self.result = None
           if self.mode == constants.IALLOCATOR_MODE_ALLOC:
             keyset = self._ALLO_KEYS
             fn = self._AddNewInstance
           elif self.mode == constants.IALLOCATOR_MODE_RELOC:
             keyset = self._RELO_KEYS
             fn = self._AddRelocateInstance
           elif self.mode == constants.IALLOCATOR_MODE_MEVAC:
             keyset = self._EVAC_KEYS
             fn = self._AddEvacuateNodes
           else:
             raise errors.ProgrammerError("Unknown mode '%s' passed to the"
                                          " IAllocator" % self.mode)
           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(fn)
         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
+            }
           iinfo = cfg.GetAllInstancesInfo().values()
           i_list = [(inst, cluster_info.FillBE(inst)) for inst in iinfo]
           # node data
           node_results = {}
           node_list = cfg.GetNodeList()
           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
           elif self.mode == constants.IALLOCATOR_MODE_MEVAC:
             hypervisor_name = cluster_info.enabled_hypervisors[0]
           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)
           for nname, nresult in node_data.items():
             # first fill in static (config-based) values
             ninfo = cfg.GetNodeInfo(nname)
             pnr = {
               "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,
+              }
             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 = 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_MEMORY]
                   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_MEMORY] - i_used_mem
                   remote_info['memory_free'] -= max(0, i_mem_diff)
                   if iinfo.admin_up:
                     i_p_up_mem += beinfo[constants.BE_MEMORY]
               # 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.update(pnr_dyn)
             node_results[nname] = pnr
           data["nodes"] = node_results
           # 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_up": iinfo.admin_up,
               "vcpus": beinfo[constants.BE_VCPUS],
               "memory": beinfo[constants.BE_MEMORY],
               "os": iinfo.os,
               "nodes": [iinfo.primary_node] + list(iinfo.secondary_nodes),
               "nics": nic_data,
               "disks": [{"size": dsk.size, "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
           data["instances"] = instance_data
           self.in_data = 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_NET_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.mem_size,
             "disks": self.disks,
             "disk_space_total": disk_space,
             "nics": self.nics,
             "required_nodes": self.required_nodes,
+            }
           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_NET_MIRROR:
             raise errors.OpPrereqError("Can't relocate non-mirrored instances",
                                        errors.ECODE_INVAL)
           if len(instance.secondary_nodes) != 1:
             raise errors.OpPrereqError("Instance has not exactly one secondary node",
                                        errors.ECODE_STATE)
           self.required_nodes = 1
           disk_sizes = [{'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 _AddEvacuateNodes(self):
           """Add evacuate nodes data to allocator structure.
           """
           request = {
             "evac_nodes": self.evac_nodes
+            }
           return request
         def _BuildInputData(self, fn):
           """Build input data structures.
           """
           self._ComputeClusterData()
           request = fn()
           request["type"] = self.mode
           self.in_data["request"] = request
           self.in_text = serializer.Dump(self.in_data)
         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 isinstance(rdict["result"], list):
             raise errors.OpExecError("Can't parse iallocator results: 'result' key"
                                      " is not a list")
           self.out_data = rdict
       class LUTestAllocator(NoHooksLU):
         """Run allocator tests.
         This LU runs the allocator tests
         """
         _OP_PARAMS = [
           ("direction", _NoDefault, _TElemOf(constants.VALID_IALLOCATOR_DIRECTIONS)),
           ("mode", _NoDefault, _TElemOf(constants.VALID_IALLOCATOR_MODES)),
           ("name", _NoDefault, _TNonEmptyString),
           ("nics", _NoDefault, _TOr(_TNone, _TListOf(
             _TDictOf(_TElemOf(["mac", "ip", "bridge"]),
                      _TOr(_TNone, _TNonEmptyString))))),
           ("disks", _NoDefault, _TOr(_TNone, _TList)),
           ("hypervisor", None, _TMaybeString),
           ("allocator", None, _TMaybeString),
           ("tags", _EmptyList, _TListOf(_TNonEmptyString)),
           ("mem_size", None, _TOr(_TNone, _TPositiveInt)),
           ("vcpus", None, _TOr(_TNone, _TPositiveInt)),
           ("os", None, _TMaybeString),
           ("disk_template", None, _TMaybeString),
           ("evac_nodes", None, _TOr(_TNone, _TListOf(_TNonEmptyString))),
+          ]
         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 ["mem_size", "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
                   "size" not in row or
                   not isinstance(row["size"], int) or
                   "mode" not in row or
                   row["mode"] not in ['r', 'w']):
                 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 = self.cfg.GetInstanceInfo(fname).secondary_nodes
           elif self.op.mode == constants.IALLOCATOR_MODE_MEVAC:
             if not hasattr(self.op, "evac_nodes"):
               raise errors.OpPrereqError("Missing attribute 'evac_nodes' on"
                                          " opcode input", errors.ECODE_INVAL)
           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,
                              mem_size=self.op.mem_size,
                              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_MEVAC:
             ial = IAllocator(self.cfg, self.rpc,
                              mode=self.op.mode,
                              evac_nodes=self.op.evac_nodes)
           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

Synnefo » snf-ganeti

root / lib / cmdlib.py @ c950e9f2