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

| Branch: | Tag: | Revision:

root / lib / cmdlib.py @ 8b3fd458

History | View | Annotate | Download (184.8 kB)

+      #
+      #
       # Copyright (C) 2006, 2007, 2008 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=W0613,W0201
       import os
       import os.path
       import sha
       import time
       import tempfile
       import re
       import platform
       import logging
       import copy
       from ganeti import ssh
       from ganeti import logger
       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 opcodes
       from ganeti import serializer
       class LogicalUnit(object):
         """Logical Unit base class.
         Subclasses must follow these rules:
           - implement ExpandNames
           - implement CheckPrereq
           - implement Exec
           - implement BuildHooksEnv
           - redefine HPATH and HTYPE
           - optionally redefine their run requirements:
               REQ_MASTER: the LU needs to run on the master node
               REQ_BGL: the LU needs to hold the Big Ganeti Lock exclusively
         Note that all commands require root permissions.
         """
         HPATH = None
         HTYPE = None
         _OP_REQP = []
         REQ_MASTER = True
         REQ_BGL = True
         def __init__(self, processor, op, context, rpc):
           """Constructor for LogicalUnit.
           This needs to be overriden 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(((i, 0) for i in locking.LEVELS))
           self.add_locks = {}
           self.remove_locks = {}
           # Used to force good behavior when calling helper functions
           self.recalculate_locks = {}
           self.__ssh = None
           for attr_name in self._OP_REQP:
             attr_val = getattr(op, attr_name, None)
             if attr_val is None:
               raise errors.OpPrereqError("Required parameter '%s' missing" %
                                          attr_name)
           if not self.cfg.IsCluster():
             raise errors.OpPrereqError("Cluster not initialized yet,"
                                        " use 'gnt-cluster init' first.")
           if self.REQ_MASTER:
             master = self.cfg.GetMasterNode()
             if master != utils.HostInfo().name:
               raise errors.OpPrereqError("Commands must be run on the master"
                                          " node %s" % master)
         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 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.
           Examples:
           # Acquire all nodes and one instance
           self.needed_locks = {
             locking.LEVEL_NODE: locking.ALL_SET,
             locking.LEVEL_INSTANCE: ['instance1.example.tld'],
+          }
           # Acquire just two nodes
           self.needed_locks = {
             locking.LEVEL_NODE: ['node1.example.tld', 'node2.example.tld'],
+          }
           # 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.
           """
           raise NotImplementedError
         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.
           """
           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.
           Args:
             phase: the hooks phase that has just been run
             hooks_results: the results of the multi-node hooks rpc call
             feedback_fn: function to send feedback back to the caller
             lu_result: the previous result this LU had, or None in the PRE phase.
           """
           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"
           expanded_name = self.cfg.ExpandInstanceName(self.op.instance_name)
           if expanded_name is None:
             raise errors.OpPrereqError("Instance '%s' not known" %
                                         self.op.instance_name)
           self.needed_locks[locking.LEVEL_INSTANCE] = expanded_name
           self.op.instance_name = expanded_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):
         """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 _GetWantedNodes(lu, nodes):
         """Returns list of checked and expanded node names.
         Args:
           nodes: List of nodes (strings) or None for all
         """
         if not isinstance(nodes, list):
           raise errors.OpPrereqError("Invalid argument type 'nodes'")
         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 = []
         for name in nodes:
           node = lu.cfg.ExpandNodeName(name)
           if node is None:
             raise errors.OpPrereqError("No such node name '%s'" % name)
           wanted.append(node)
         return utils.NiceSort(wanted)
       def _GetWantedInstances(lu, instances):
         """Returns list of checked and expanded instance names.
         Args:
           instances: List of instances (strings) or None for all
         """
         if not isinstance(instances, list):
           raise errors.OpPrereqError("Invalid argument type 'instances'")
         if instances:
           wanted = []
           for name in instances:
             instance = lu.cfg.ExpandInstanceName(name)
             if instance is None:
               raise errors.OpPrereqError("No such instance name '%s'" % name)
             wanted.append(instance)
         else:
           wanted = lu.cfg.GetInstanceList()
         return utils.NiceSort(wanted)
       def _CheckOutputFields(static, dynamic, selected):
         """Checks whether all selected fields are valid.
         Args:
           static: Static fields
           dynamic: Dynamic fields
         """
         static_fields = frozenset(static)
         dynamic_fields = frozenset(dynamic)
         all_fields = static_fields | dynamic_fields
         if not all_fields.issuperset(selected):
           raise errors.OpPrereqError("Unknown output fields selected: %s"
                                      % ",".join(frozenset(selected).
                                                 difference(all_fields)))
       def _BuildInstanceHookEnv(name, primary_node, secondary_nodes, os_type, status,
                                 memory, vcpus, nics):
         """Builds instance related env variables for hooks from single variables.
         Args:
           secondary_nodes: List of secondary nodes as strings
         """
         env = {
           "OP_TARGET": name,
           "INSTANCE_NAME": name,
           "INSTANCE_PRIMARY": primary_node,
           "INSTANCE_SECONDARIES": " ".join(secondary_nodes),
           "INSTANCE_OS_TYPE": os_type,
           "INSTANCE_STATUS": status,
           "INSTANCE_MEMORY": memory,
           "INSTANCE_VCPUS": vcpus,
+        }
         if nics:
           nic_count = len(nics)
           for idx, (ip, bridge, mac) in enumerate(nics):
             if ip is None:
               ip = ""
             env["INSTANCE_NIC%d_IP" % idx] = ip
             env["INSTANCE_NIC%d_BRIDGE" % idx] = bridge
             env["INSTANCE_NIC%d_HWADDR" % idx] = mac
         else:
           nic_count = 0
         env["INSTANCE_NIC_COUNT"] = nic_count
         return env
       def _BuildInstanceHookEnvByObject(instance, override=None):
         """Builds instance related env variables for hooks from an object.
         Args:
           instance: objects.Instance object of instance
           override: dict of values to override
         """
         args = {
           'name': instance.name,
           'primary_node': instance.primary_node,
           'secondary_nodes': instance.secondary_nodes,
           'os_type': instance.os,
           'status': instance.os,
           'memory': instance.memory,
           'vcpus': instance.vcpus,
           'nics': [(nic.ip, nic.bridge, nic.mac) for nic in instance.nics],
+        }
         if override:
           args.update(override)
         return _BuildInstanceHookEnv(**args)
       def _CheckInstanceBridgesExist(lu, instance):
         """Check that the brigdes needed by an instance exist.
         """
         # check bridges existance
         brlist = [nic.bridge for nic in instance.nics]
         if not lu.rpc.call_bridges_exist(instance.primary_node, brlist):
           raise errors.OpPrereqError("one or more target bridges %s does not"
                                      " exist on destination node '%s'" %
                                      (brlist, instance.primary_node))
       class LUDestroyCluster(NoHooksLU):
         """Logical unit for destroying the cluster.
         """
         _OP_REQP = []
         def CheckPrereq(self):
           """Check prerequisites.
           This checks whether the cluster is empty.
           Any errors are signalled 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))
           instancelist = self.cfg.GetInstanceList()
           if instancelist:
             raise errors.OpPrereqError("There are still %d instance(s) in"
                                        " this cluster." % len(instancelist))
         def Exec(self, feedback_fn):
           """Destroys the cluster.
           """
           master = self.cfg.GetMasterNode()
           if not self.rpc.call_node_stop_master(master, False):
             raise errors.OpExecError("Could not disable the master role")
           priv_key, pub_key, _ = ssh.GetUserFiles(constants.GANETI_RUNAS)
           utils.CreateBackup(priv_key)
           utils.CreateBackup(pub_key)
           return master
       class LUVerifyCluster(LogicalUnit):
         """Verifies the cluster status.
         """
         HPATH = "cluster-verify"
         HTYPE = constants.HTYPE_CLUSTER
         _OP_REQP = ["skip_checks"]
         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(((i, 1) for i in locking.LEVELS))
         def _VerifyNode(self, node, file_list, local_cksum, vglist, node_result,
                         remote_version, feedback_fn):
           """Run multiple tests against a node.
           Test list:
             - compares ganeti version
             - checks vg existance and size > 20G
             - checks config file checksum
             - checks ssh to other nodes
           Args:
             node: name of the node to check
             file_list: required list of files
             local_cksum: dictionary of local files and their checksums
           """
           # compares ganeti version
           local_version = constants.PROTOCOL_VERSION
           if not remote_version:
             feedback_fn("  - ERROR: connection to %s failed" % (node))
             return True
           if local_version != remote_version:
             feedback_fn("  - ERROR: sw version mismatch: master %s, node(%s) %s" %
                             (local_version, node, remote_version))
             return True
           # checks vg existance and size > 20G
           bad = False
           if not vglist:
             feedback_fn("  - ERROR: unable to check volume groups on node %s." %
                             (node,))
             bad = True
           else:
             vgstatus = utils.CheckVolumeGroupSize(vglist, self.cfg.GetVGName(),
                                                   constants.MIN_VG_SIZE)
             if vgstatus:
               feedback_fn("  - ERROR: %s on node %s" % (vgstatus, node))
               bad = True
           if not node_result:
             feedback_fn("  - ERROR: unable to verify node %s." % (node,))
             return True
           # checks config file checksum
           # checks ssh to any
           if 'filelist' not in node_result:
             bad = True
             feedback_fn("  - ERROR: node hasn't returned file checksum data")
           else:
             remote_cksum = node_result['filelist']
             for file_name in file_list:
               if file_name not in remote_cksum:
                 bad = True
                 feedback_fn("  - ERROR: file '%s' missing" % file_name)
               elif remote_cksum[file_name] != local_cksum[file_name]:
                 bad = True
                 feedback_fn("  - ERROR: file '%s' has wrong checksum" % file_name)
           if 'nodelist' not in node_result:
             bad = True
             feedback_fn("  - ERROR: node hasn't returned node ssh connectivity data")
           else:
             if node_result['nodelist']:
               bad = True
               for node in node_result['nodelist']:
                 feedback_fn("  - ERROR: ssh communication with node '%s': %s" %
                                 (node, node_result['nodelist'][node]))
           if 'node-net-test' not in node_result:
             bad = True
             feedback_fn("  - ERROR: node hasn't returned node tcp connectivity data")
           else:
             if node_result['node-net-test']:
               bad = True
               nlist = utils.NiceSort(node_result['node-net-test'].keys())
               for node in nlist:
                 feedback_fn("  - ERROR: tcp communication with node '%s': %s" %
                                 (node, node_result['node-net-test'][node]))
           hyp_result = node_result.get('hypervisor', None)
           if isinstance(hyp_result, dict):
             for hv_name, hv_result in hyp_result.iteritems():
               if hv_result is not None:
                 feedback_fn("  - ERROR: hypervisor %s verify failure: '%s'" %
                             (hv_name, hv_result))
           return bad
         def _VerifyInstance(self, instance, instanceconfig, node_vol_is,
                             node_instance, feedback_fn):
           """Verify an instance.
           This function checks to see if the required block devices are
           available on the instance's node.
           """
           bad = False
           node_current = instanceconfig.primary_node
           node_vol_should = {}
           instanceconfig.MapLVsByNode(node_vol_should)
           for node in node_vol_should:
             for volume in node_vol_should[node]:
               if node not in node_vol_is or volume not in node_vol_is[node]:
                 feedback_fn("  - ERROR: volume %s missing on node %s" %
                                 (volume, node))
                 bad = True
           if not instanceconfig.status == 'down':
             if (node_current not in node_instance or
                 not instance in node_instance[node_current]):
               feedback_fn("  - ERROR: instance %s not running on node %s" %
                               (instance, node_current))
               bad = True
           for node in node_instance:
             if (not node == node_current):
               if instance in node_instance[node]:
                 feedback_fn("  - ERROR: instance %s should not run on node %s" %
                                 (instance, node))
                 bad = True
           return bad
         def _VerifyOrphanVolumes(self, node_vol_should, node_vol_is, feedback_fn):
           """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.
           """
           bad = False
           for node in node_vol_is:
             for volume in node_vol_is[node]:
               if node not in node_vol_should or volume not in node_vol_should[node]:
                 feedback_fn("  - ERROR: volume %s on node %s should not exist" %
                             (volume, node))
                 bad = True
           return bad
         def _VerifyOrphanInstances(self, instancelist, node_instance, feedback_fn):
           """Verify the list of running instances.
           This checks what instances are running but unknown to the cluster.
           """
           bad = False
           for node in node_instance:
             for runninginstance in node_instance[node]:
               if runninginstance not in instancelist:
                 feedback_fn("  - ERROR: instance %s on node %s should not exist" %
                                 (runninginstance, node))
                 bad = True
           return bad
         def _VerifyNPlusOneMemory(self, node_info, instance_cfg, feedback_fn):
           """Verify N+1 Memory Resilience.
           Check that if one single node dies we can still start all the instances it
           was primary for.
           """
           bad = False
           for node, nodeinfo in node_info.iteritems():
             # 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 nodeinfo['sinst-by-pnode'].iteritems():
               needed_mem = 0
               for instance in instances:
                 needed_mem += instance_cfg[instance].memory
               if nodeinfo['mfree'] < needed_mem:
                 feedback_fn("  - ERROR: not enough memory on node %s to accomodate"
                             " failovers should node %s fail" % (node, prinode))
                 bad = True
           return bad
         def CheckPrereq(self):
           """Check prerequisites.
           Transform the list of checks we're going to skip into a set and check that
           all its members are valid.
           """
           self.skip_set = frozenset(self.op.skip_checks)
           if not constants.VERIFY_OPTIONAL_CHECKS.issuperset(self.skip_set):
             raise errors.OpPrereqError("Invalid checks to be skipped specified")
         def BuildHooksEnv(self):
           """Build hooks env.
           Cluster-Verify hooks just rone 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()
           # TODO: populate the environment with useful information for verify hooks
           env = {}
           return env, [], all_nodes
         def Exec(self, feedback_fn):
           """Verify integrity of cluster, performing various test on nodes.
           """
           bad = False
           feedback_fn("* Verifying global settings")
           for msg in self.cfg.VerifyConfig():
             feedback_fn("  - ERROR: %s" % msg)
           vg_name = self.cfg.GetVGName()
           hypervisors = self.cfg.GetClusterInfo().enabled_hypervisors
           nodelist = utils.NiceSort(self.cfg.GetNodeList())
           nodeinfo = [self.cfg.GetNodeInfo(nname) for nname in nodelist]
           instancelist = utils.NiceSort(self.cfg.GetInstanceList())
           i_non_redundant = [] # Non redundant instances
           node_volume = {}
           node_instance = {}
           node_info = {}
           instance_cfg = {}
           # FIXME: verify OS list
           # do local checksums
           file_names = []
           file_names.append(constants.SSL_CERT_FILE)
           file_names.append(constants.CLUSTER_CONF_FILE)
           local_checksums = utils.FingerprintFiles(file_names)
           feedback_fn("* Gathering data (%d nodes)" % len(nodelist))
           all_volumeinfo = self.rpc.call_volume_list(nodelist, vg_name)
           all_instanceinfo = self.rpc.call_instance_list(nodelist, hypervisors)
           all_vglist = self.rpc.call_vg_list(nodelist)
           node_verify_param = {
             'filelist': file_names,
             'nodelist': nodelist,
             'hypervisor': hypervisors,
             'node-net-test': [(node.name, node.primary_ip, node.secondary_ip)
                               for node in nodeinfo]
+            }
           all_nvinfo = self.rpc.call_node_verify(nodelist, node_verify_param,
                                                  self.cfg.GetClusterName())
           all_rversion = self.rpc.call_version(nodelist)
           all_ninfo = self.rpc.call_node_info(nodelist, self.cfg.GetVGName(),
                                               self.cfg.GetHypervisorType())
           for node in nodelist:
             feedback_fn("* Verifying node %s" % node)
             result = self._VerifyNode(node, file_names, local_checksums,
                                       all_vglist[node], all_nvinfo[node],
                                       all_rversion[node], feedback_fn)
             bad = bad or result
             # node_volume
             volumeinfo = all_volumeinfo[node]
             if isinstance(volumeinfo, basestring):
               feedback_fn("  - ERROR: LVM problem on node %s: %s" %
                           (node, volumeinfo[-400:].encode('string_escape')))
               bad = True
               node_volume[node] = {}
             elif not isinstance(volumeinfo, dict):
               feedback_fn("  - ERROR: connection to %s failed" % (node,))
               bad = True
               continue
             else:
               node_volume[node] = volumeinfo
             # node_instance
             nodeinstance = all_instanceinfo[node]
             if type(nodeinstance) != list:
               feedback_fn("  - ERROR: connection to %s failed" % (node,))
               bad = True
               continue
             node_instance[node] = nodeinstance
             # node_info
             nodeinfo = all_ninfo[node]
             if not isinstance(nodeinfo, dict):
               feedback_fn("  - ERROR: connection to %s failed" % (node,))
               bad = True
               continue
             try:
               node_info[node] = {
                 "mfree": int(nodeinfo['memory_free']),
                 "dfree": int(nodeinfo['vg_free']),
                 "pinst": [],
                 "sinst": [],
                 # dictionary holding all instances this node is secondary for,
                 # grouped by their primary node. Each key is a cluster node, and each
                 # value is a list of instances which have the key as primary and the
                 # current node as secondary.  this is handy to calculate N+1 memory
                 # availability if you can only failover from a primary to its
                 # secondary.
                 "sinst-by-pnode": {},
+              }
             except ValueError:
               feedback_fn("  - ERROR: invalid value returned from node %s" % (node,))
               bad = True
               continue
           node_vol_should = {}
           for instance in instancelist:
             feedback_fn("* Verifying instance %s" % instance)
             inst_config = self.cfg.GetInstanceInfo(instance)
             result =  self._VerifyInstance(instance, inst_config, node_volume,
                                            node_instance, feedback_fn)
             bad = bad or result
             inst_config.MapLVsByNode(node_vol_should)
             instance_cfg[instance] = inst_config
             pnode = inst_config.primary_node
             if pnode in node_info:
               node_info[pnode]['pinst'].append(instance)
             else:
               feedback_fn("  - ERROR: instance %s, connection to primary node"
                           " %s failed" % (instance, pnode))
               bad = True
             # 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 len(inst_config.secondary_nodes) == 0:
               i_non_redundant.append(instance)
             elif len(inst_config.secondary_nodes) > 1:
               feedback_fn("  - WARNING: multiple secondaries for instance %s"
                           % instance)
             for snode in inst_config.secondary_nodes:
               if snode in node_info:
                 node_info[snode]['sinst'].append(instance)
                 if pnode not in node_info[snode]['sinst-by-pnode']:
                   node_info[snode]['sinst-by-pnode'][pnode] = []
                 node_info[snode]['sinst-by-pnode'][pnode].append(instance)
               else:
                 feedback_fn("  - ERROR: instance %s, connection to secondary node"
                             " %s failed" % (instance, snode))
           feedback_fn("* Verifying orphan volumes")
           result = self._VerifyOrphanVolumes(node_vol_should, node_volume,
                                              feedback_fn)
           bad = bad or result
           feedback_fn("* Verifying remaining instances")
           result = self._VerifyOrphanInstances(instancelist, node_instance,
                                                feedback_fn)
           bad = bad or result
           if constants.VERIFY_NPLUSONE_MEM not in self.skip_set:
             feedback_fn("* Verifying N+1 Memory redundancy")
             result = self._VerifyNPlusOneMemory(node_info, instance_cfg, feedback_fn)
             bad = bad or result
           feedback_fn("* Other Notes")
           if i_non_redundant:
             feedback_fn("  - NOTICE: %d non-redundant instance(s) found."
                         % len(i_non_redundant))
           return not bad
         def HooksCallBack(self, phase, hooks_results, feedback_fn, lu_result):
           """Analize the post-hooks' result, handle it, and send some
           nicely-formatted feedback back to the user.
           Args:
             phase: the hooks phase that has just been run
             hooks_results: the results of the multi-node hooks rpc call
             feedback_fn: function to send feedback back to the caller
             lu_result: previous Exec result
           """
           # 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")
             if not hooks_results:
               feedback_fn("  - ERROR: general communication failure")
               lu_result = 1
             else:
               for node_name in hooks_results:
                 show_node_header = True
                 res = hooks_results[node_name]
                 if res is False or not isinstance(res, list):
                   feedback_fn("    Communication failure")
                   lu_result = 1
                   continue
                 for script, hkr, output in res:
                   if hkr == constants.HKR_FAIL:
                     # The node header is only shown once, if there are
                     # failing hooks on that node
                     if show_node_header:
                       feedback_fn("  Node %s:" % node_name)
                       show_node_header = False
                     feedback_fn("    ERROR: Script %s failed, output:" % script)
                     output = indent_re.sub('      ', output)
                     feedback_fn("%s" % output)
                     lu_result = 1
             return lu_result
       class LUVerifyDisks(NoHooksLU):
         """Verifies the cluster disks status.
         """
         _OP_REQP = []
         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(((i, 1) for i in locking.LEVELS))
         def CheckPrereq(self):
           """Check prerequisites.
           This has no prerequisites.
           """
           pass
         def Exec(self, feedback_fn):
           """Verify integrity of cluster disks.
           """
           result = res_nodes, res_nlvm, 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 (inst.status != "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_volume_list(nodes, vg_name)
           to_act = set()
           for node in nodes:
             # node_volume
             lvs = node_lvs[node]
             if isinstance(lvs, basestring):
               logger.Info("error enumerating LVs on node %s: %s" % (node, lvs))
               res_nlvm[node] = lvs
             elif not isinstance(lvs, dict):
               logger.Info("connection to node %s failed or invalid data returned" %
                           (node,))
               res_nodes.append(node)
               continue
             for lv_name, (_, lv_inactive, lv_online) in lvs.iteritems():
               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 LURenameCluster(LogicalUnit):
         """Rename the cluster.
         """
         HPATH = "cluster-rename"
         HTYPE = constants.HTYPE_CLUSTER
         _OP_REQP = ["name"]
         def BuildHooksEnv(self):
           """Build hooks env.
           """
           env = {
             "OP_TARGET": self.cfg.GetClusterName(),
             "NEW_NAME": self.op.name,
+            }
           mn = self.cfg.GetMasterNode()
           return env, [mn], [mn]
         def CheckPrereq(self):
           """Verify that the passed name is a valid one.
           """
           hostname = utils.HostInfo(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")
           if new_ip != old_ip:
             if utils.TcpPing(new_ip, constants.DEFAULT_NODED_PORT):
               raise errors.OpPrereqError("The given cluster IP address (%s) is"
                                          " reachable on the network. Aborting." %
                                          new_ip)
           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()
           if not self.rpc.call_node_stop_master(master, False):
             raise errors.OpExecError("Could not disable the master role")
           try:
             # modify the sstore
             # TODO: sstore
             ss.SetKey(ss.SS_MASTER_IP, ip)
             ss.SetKey(ss.SS_CLUSTER_NAME, clustername)
             # Distribute updated ss config to all nodes
             myself = self.cfg.GetNodeInfo(master)
             dist_nodes = self.cfg.GetNodeList()
             if myself.name in dist_nodes:
               dist_nodes.remove(myself.name)
             logger.Debug("Copying updated ssconf data to all nodes")
             for keyname in [ss.SS_CLUSTER_NAME, ss.SS_MASTER_IP]:
               fname = ss.KeyToFilename(keyname)
               result = self.rpc.call_upload_file(dist_nodes, fname)
               for to_node in dist_nodes:
                 if not result[to_node]:
                   logger.Error("copy of file %s to node %s failed" %
                                (fname, to_node))
           finally:
             if not self.rpc.call_node_start_master(master, False):
               logger.Error("Could not re-enable the master role on the master,"
                            " please restart manually.")
       def _RecursiveCheckIfLVMBased(disk):
         """Check if the given disk or its children are lvm-based.
         Args:
           disk: ganeti.objects.Disk object
         Returns:
           boolean indicating whether a LD_LV dev_type was found or not
         """
         if disk.children:
           for chdisk in disk.children:
             if _RecursiveCheckIfLVMBased(chdisk):
               return True
         return disk.dev_type == constants.LD_LV
       class LUSetClusterParams(LogicalUnit):
         """Change the parameters of the cluster.
         """
         HPATH = "cluster-modify"
         HTYPE = constants.HTYPE_CLUSTER
         _OP_REQP = []
         REQ_BGL = False
         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.
           """
           # FIXME: This only works because there is only one parameter that can be
           # changed or removed.
           if not self.op.vg_name:
             instances = self.cfg.GetAllInstancesInfo().values()
             for inst in instances:
               for disk in inst.disks:
                 if _RecursiveCheckIfLVMBased(disk):
                   raise errors.OpPrereqError("Cannot disable lvm storage while"
                                              " lvm-based instances exist")
           # if vg_name not None, checks given volume group on all nodes
           if self.op.vg_name:
             node_list = self.acquired_locks[locking.LEVEL_NODE]
             vglist = self.rpc.call_vg_list(node_list)
             for node in node_list:
               vgstatus = utils.CheckVolumeGroupSize(vglist[node], self.op.vg_name,
                                                     constants.MIN_VG_SIZE)
               if vgstatus:
                 raise errors.OpPrereqError("Error on node '%s': %s" %
                                            (node, vgstatus))
         def Exec(self, feedback_fn):
           """Change the parameters of the cluster.
           """
           if self.op.vg_name != self.cfg.GetVGName():
             self.cfg.SetVGName(self.op.vg_name)
           else:
             feedback_fn("Cluster LVM configuration already in desired"
                         " state, not changing")
       def _WaitForSync(lu, instance, oneshot=False, unlock=False):
         """Sleep and poll for an instance's disk to sync.
         """
         if not instance.disks:
           return True
         if not oneshot:
           lu.proc.LogInfo("Waiting for instance %s to sync disks." % instance.name)
         node = instance.primary_node
         for dev in instance.disks:
           lu.cfg.SetDiskID(dev, node)
         retries = 0
         while True:
           max_time = 0
           done = True
           cumul_degraded = False
           rstats = lu.rpc.call_blockdev_getmirrorstatus(node, instance.disks)
           if not rstats:
             lu.proc.LogWarning("Can't get any data from node %s" % node)
             retries += 1
             if retries >= 10:
               raise errors.RemoteError("Can't contact node %s for mirror data,"
                                        " aborting." % node)
             time.sleep(6)
             continue
           retries = 0
           for i in range(len(rstats)):
             mstat = rstats[i]
             if mstat is None:
               lu.proc.LogWarning("Can't compute data for node %s/%s" %
                                  (node, instance.disks[i].iv_name))
               continue
             # we ignore the ldisk parameter
             perc_done, est_time, is_degraded, _ = mstat
             cumul_degraded = cumul_degraded or (is_degraded and perc_done is None)
             if perc_done is not None:
               done = False
               if est_time is not None:
                 rem_time = "%d estimated seconds remaining" % est_time
                 max_time = est_time
               else:
                 rem_time = "no time estimate"
               lu.proc.LogInfo("- device %s: %5.2f%% done, %s" %
                               (instance.disks[i].iv_name, perc_done, rem_time))
           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)
         if ldisk:
           idx = 6
         else:
           idx = 5
         result = True
         if on_primary or dev.AssembleOnSecondary():
           rstats = lu.rpc.call_blockdev_find(node, dev)
           if not rstats:
             logger.ToStderr("Node %s: Disk degraded, not found or node down" % node)
             result = False
           else:
             result = result and (not rstats[idx])
         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_REQP = ["output_fields", "names"]
         REQ_BGL = False
         def ExpandNames(self):
           if self.op.names:
             raise errors.OpPrereqError("Selective OS query not supported")
           self.dynamic_fields = frozenset(["name", "valid", "node_status"])
           _CheckOutputFields(static=[],
                              dynamic=self.dynamic_fields,
                              selected=self.op.output_fields)
           # Lock all nodes, in shared mode
           self.needed_locks = {}
           self.share_locks[locking.LEVEL_NODE] = 1
           self.needed_locks[locking.LEVEL_NODE] = locking.ALL_SET
         def CheckPrereq(self):
           """Check prerequisites.
           """
         @staticmethod
         def _DiagnoseByOS(node_list, rlist):
           """Remaps a per-node return list into an a per-os per-node dictionary
             Args:
               node_list: a list with the names of all nodes
               rlist: a map with node names as keys and OS objects as values
             Returns:
               map: a map with osnames as keys and as value another map, with
                    nodes as
                    keys and list of OS objects as values
                    e.g. {"debian-etch": {"node1": [<object>,...],
                                          "node2": [<object>,]}
+                        }
           """
           all_os = {}
           for node_name, nr in rlist.iteritems():
             if not nr:
               continue
             for os_obj in nr:
               if os_obj.name not in all_os:
                 # build a list of nodes for this os containing empty lists
                 # for each node in node_list
                 all_os[os_obj.name] = {}
                 for nname in node_list:
                   all_os[os_obj.name][nname] = []
               all_os[os_obj.name][node_name].append(os_obj)
           return all_os
         def Exec(self, feedback_fn):
           """Compute the list of OSes.
           """
           node_list = self.acquired_locks[locking.LEVEL_NODE]
           node_data = self.rpc.call_os_diagnose(node_list)
           if node_data == False:
             raise errors.OpExecError("Can't gather the list of OSes")
           pol = self._DiagnoseByOS(node_list, node_data)
           output = []
           for os_name, os_data in pol.iteritems():
             row = []
             for field in self.op.output_fields:
               if field == "name":
                 val = os_name
               elif field == "valid":
                 val = utils.all([osl and osl[0] for osl in os_data.values()])
               elif field == "node_status":
                 val = {}
                 for node_name, nos_list in os_data.iteritems():
                   val[node_name] = [(v.status, v.path) for v in nos_list]
               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_REQP = ["node_name"]
         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()
           all_nodes.remove(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 signalled by raising errors.OpPrereqError.
           """
           node = self.cfg.GetNodeInfo(self.cfg.ExpandNodeName(self.op.node_name))
           if node is None:
             raise errors.OpPrereqError, ("Node '%s' is unknown." % self.op.node_name)
           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.")
           for instance_name in instance_list:
             instance = self.cfg.GetInstanceInfo(instance_name)
             if node.name == instance.primary_node:
               raise errors.OpPrereqError("Instance %s still running on the node,"
                                          " please remove first." % instance_name)
             if node.name in instance.secondary_nodes:
               raise errors.OpPrereqError("Instance %s has node as a secondary,"
                                          " please remove first." % instance_name)
           self.op.node_name = node.name
           self.node = node
         def Exec(self, feedback_fn):
           """Removes the node from the cluster.
           """
           node = self.node
           logger.Info("stopping the node daemon and removing configs from node %s" %
                       node.name)
           self.context.RemoveNode(node.name)
           self.rpc.call_node_leave_cluster(node.name)
       class LUQueryNodes(NoHooksLU):
         """Logical unit for querying nodes.
         """
         _OP_REQP = ["output_fields", "names"]
         REQ_BGL = False
         def ExpandNames(self):
           self.dynamic_fields = frozenset([
             "dtotal", "dfree",
             "mtotal", "mnode", "mfree",
             "bootid",
             "ctotal",
             ])
           self.static_fields = frozenset([
             "name", "pinst_cnt", "sinst_cnt",
             "pinst_list", "sinst_list",
             "pip", "sip", "tags",
             "serial_no",
             ])
           _CheckOutputFields(static=self.static_fields,
                              dynamic=self.dynamic_fields,
                              selected=self.op.output_fields)
           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_locking = not self.static_fields.issuperset(self.op.output_fields)
           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 CheckPrereq(self):
           """Check prerequisites.
           """
           # The validation of the node list is done in the _GetWantedNodes,
           # if non empty, and if empty, there's no validation to do
           pass
         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()
           nodelist = [all_info[name] for name in nodenames]
           # begin data gathering
           if self.dynamic_fields.intersection(self.op.output_fields):
             live_data = {}
             node_data = self.rpc.call_node_info(nodenames, self.cfg.GetVGName(),
                                                 self.cfg.GetHypervisorType())
             for name in nodenames:
               nodeinfo = node_data.get(name, None)
               if nodeinfo:
                 live_data[name] = {
                   "mtotal": utils.TryConvert(int, nodeinfo['memory_total']),
                   "mnode": utils.TryConvert(int, nodeinfo['memory_dom0']),
                   "mfree": utils.TryConvert(int, nodeinfo['memory_free']),
                   "dtotal": utils.TryConvert(int, nodeinfo['vg_size']),
                   "dfree": utils.TryConvert(int, nodeinfo['vg_free']),
                   "ctotal": utils.TryConvert(int, nodeinfo['cpu_total']),
                   "bootid": nodeinfo['bootid'],
+                  }
               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):
             instancelist = self.cfg.GetInstanceList()
             for instance_name in instancelist:
               inst = self.cfg.GetInstanceInfo(instance_name)
               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)
           # end data gathering
           output = []
           for node in nodelist:
             node_output = []
             for field in self.op.output_fields:
               if field == "name":
                 val = node.name
               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 == "serial_no":
                 val = node.serial_no
               elif field in self.dynamic_fields:
                 val = live_data[node.name].get(field, None)
               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_REQP = ["nodes", "output_fields"]
         REQ_BGL = False
         def ExpandNames(self):
           _CheckOutputFields(static=["node"],
                              dynamic=["phys", "vg", "name", "size", "instance"],
                              selected=self.op.output_fields)
           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 CheckPrereq(self):
           """Check prerequisites.
           This checks that the fields required are valid output fields.
           """
           self.nodes = self.acquired_locks[locking.LEVEL_NODE]
         def Exec(self, feedback_fn):
           """Computes the list of nodes and their attributes.
           """
           nodenames = self.nodes
           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:
             if node not in volumes or not volumes[node]:
               continue
             node_vols = volumes[node][:]
             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 LUAddNode(LogicalUnit):
         """Logical unit for adding node to the cluster.
         """
         HPATH = "node-add"
         HTYPE = constants.HTYPE_NODE
         _OP_REQP = ["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 signalled by raising errors.OpPrereqError.
           """
           node_name = self.op.node_name
           cfg = self.cfg
           dns_data = utils.HostInfo(node_name)
           node = dns_data.name
           primary_ip = self.op.primary_ip = dns_data.ip
           secondary_ip = getattr(self.op, "secondary_ip", None)
           if secondary_ip is None:
             secondary_ip = primary_ip
           if not utils.IsValidIP(secondary_ip):
             raise errors.OpPrereqError("Invalid secondary IP given")
           self.op.secondary_ip = 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)
           elif self.op.readd and node not in node_list:
             raise errors.OpPrereqError("Node %s is not in the configuration" % node)
           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.primary_ip != primary_ip or
                   existing_node.secondary_ip != secondary_ip):
                 raise errors.OpPrereqError("Readded node doesn't have the same IP"
                                            " address configuration as before")
               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)
           # 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")
             else:
               raise errors.OpPrereqError("The master has a private ip but the"
                                          " new node doesn't have one")
           # checks reachablity
           if not utils.TcpPing(primary_ip, constants.DEFAULT_NODED_PORT):
             raise errors.OpPrereqError("Node not reachable by ping")
           if not newbie_singlehomed:
             # check reachability from my secondary ip to newbie's secondary ip
             if not utils.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")
           self.new_node = objects.Node(name=node,
                                        primary_ip=primary_ip,
                                        secondary_ip=secondary_ip)
         def Exec(self, feedback_fn):
           """Adds the new node to the cluster.
           """
           new_node = self.new_node
           node = new_node.name
           # check connectivity
           result = self.rpc.call_version([node])[node]
           if result:
             if constants.PROTOCOL_VERSION == result:
               logger.Info("communication to node %s fine, sw version %s match" %
                           (node, result))
             else:
               raise errors.OpExecError("Version mismatch master version %s,"
                                        " node version %s" %
                                        (constants.PROTOCOL_VERSION, result))
           else:
             raise errors.OpExecError("Cannot get version from the new node")
           # setup ssh on node
           logger.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:
             f = open(i, 'r')
             try:
               keyarray.append(f.read())
             finally:
               f.close()
           result = self.rpc.call_node_add(node, keyarray[0], keyarray[1],
                                           keyarray[2],
                                           keyarray[3], keyarray[4], keyarray[5])
           if not result:
             raise errors.OpExecError("Cannot transfer ssh keys to the new node")
           # Add node to our /etc/hosts, and add key to known_hosts
           utils.AddHostToEtcHosts(new_node.name)
           if new_node.secondary_ip != new_node.primary_ip:
             if not self.rpc.call_node_has_ip_address(new_node.name,
                                                      new_node.secondary_ip):
               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 = {
             '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:
             if not result[verifier]:
               raise errors.OpExecError("Cannot communicate with %s's node daemon"
                                        " for remote verification" % verifier)
             if result[verifier]['nodelist']:
               for failed in result[verifier]['nodelist']:
                 feedback_fn("ssh/hostname verification failed %s -> %s" %
                             (verifier, result[verifier]['nodelist'][failed]))
               raise errors.OpExecError("ssh/hostname verification failed.")
           # Distribute updated /etc/hosts and known_hosts to all nodes,
           # including the node just added
           myself = self.cfg.GetNodeInfo(self.cfg.GetMasterNode())
           dist_nodes = self.cfg.GetNodeList()
           if not self.op.readd:
             dist_nodes.append(node)
           if myself.name in dist_nodes:
             dist_nodes.remove(myself.name)
           logger.Debug("Copying hosts and known_hosts to all nodes")
           for fname in (constants.ETC_HOSTS, constants.SSH_KNOWN_HOSTS_FILE):
             result = self.rpc.call_upload_file(dist_nodes, fname)
             for to_node in dist_nodes:
               if not result[to_node]:
                 logger.Error("copy of file %s to node %s failed" %
                              (fname, to_node))
           to_copy = []
           if constants.HT_XEN_HVM in self.cfg.GetClusterInfo().enabled_hypervisors:
             to_copy.append(constants.VNC_PASSWORD_FILE)
           for fname in to_copy:
             result = self.rpc.call_upload_file([node], fname)
             if not result[node]:
               logger.Error("could not copy file %s to node %s" % (fname, node))
           if self.op.readd:
             self.context.ReaddNode(new_node)
           else:
             self.context.AddNode(new_node)
       class LUQueryClusterInfo(NoHooksLU):
         """Query cluster configuration.
         """
         _OP_REQP = []
         REQ_MASTER = False
         REQ_BGL = False
         def ExpandNames(self):
           self.needed_locks = {}
         def CheckPrereq(self):
           """No prerequsites needed for this LU.
           """
           pass
         def Exec(self, feedback_fn):
           """Return cluster config.
           """
           result = {
             "name": self.cfg.GetClusterName(),
             "software_version": constants.RELEASE_VERSION,
             "protocol_version": constants.PROTOCOL_VERSION,
             "config_version": constants.CONFIG_VERSION,
             "os_api_version": constants.OS_API_VERSION,
             "export_version": constants.EXPORT_VERSION,
             "master": self.cfg.GetMasterNode(),
             "architecture": (platform.architecture()[0], platform.machine()),
             "hypervisor_type": self.cfg.GetHypervisorType(),
             "enabled_hypervisors": self.cfg.GetClusterInfo().enabled_hypervisors,
+            }
           return result
       class LUQueryConfigValues(NoHooksLU):
         """Return configuration values.
         """
         _OP_REQP = []
         REQ_BGL = False
         def ExpandNames(self):
           self.needed_locks = {}
           static_fields = ["cluster_name", "master_node"]
           _CheckOutputFields(static=static_fields,
                              dynamic=[],
                              selected=self.op.output_fields)
         def CheckPrereq(self):
           """No prerequisites.
           """
           pass
         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":
               values.append(self.cfg.GetClusterName())
             elif field == "master_node":
               values.append(self.cfg.GetMasterNode())
             else:
               raise errors.ParameterError(field)
           return values
       class LUActivateInstanceDisks(NoHooksLU):
         """Bring up an instance's disks.
         """
         _OP_REQP = ["instance_name"]
         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):
           """Activate the disks.
           """
           disks_ok, disks_info = _AssembleInstanceDisks(self, self.instance)
           if not disks_ok:
             raise errors.OpExecError("Cannot activate block devices")
           return disks_info
       def _AssembleInstanceDisks(lu, instance, ignore_secondaries=False):
         """Prepare the block devices for an instance.
         This sets up the block devices on all nodes.
         Args:
           instance: a ganeti.objects.Instance object
           ignore_secondaries: if true, errors on secondary nodes won't result
                               in an error return from the function
         Returns:
           false if the operation failed
           list of (host, instance_visible_name, node_visible_name) if the operation
                suceeded with the mapping from node devices to instance devices
         """
         device_info = []
         disks_ok = True
         iname = instance.name
         # 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 instance.disks:
           for node, node_disk in inst_disk.ComputeNodeTree(instance.primary_node):
             lu.cfg.SetDiskID(node_disk, node)
             result = lu.rpc.call_blockdev_assemble(node, node_disk, iname, False)
             if not result:
               logger.Error("could not prepare block device %s on node %s"
                            " (is_primary=False, pass=1)" % (inst_disk.iv_name, node))
               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 instance.disks:
           for node, node_disk in inst_disk.ComputeNodeTree(instance.primary_node):
             if node != instance.primary_node:
               continue
             lu.cfg.SetDiskID(node_disk, node)
             result = lu.rpc.call_blockdev_assemble(node, node_disk, iname, True)
             if not result:
               logger.Error("could not prepare block device %s on node %s"
                            " (is_primary=True, pass=2)" % (inst_disk.iv_name, node))
               disks_ok = False
           device_info.append((instance.primary_node, inst_disk.iv_name, result))
         # 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 instance.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, dummy = _AssembleInstanceDisks(lu, instance,
                                                  ignore_secondaries=force)
         if not disks_ok:
           _ShutdownInstanceDisks(lu, instance)
           if force is not None and not force:
             logger.Error("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_REQP = ["instance_name"]
         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):
         """Shutdown block devices of an instance.
         This function checks if an instance is running, before calling
         _ShutdownInstanceDisks.
         """
         ins_l = lu.rpc.call_instance_list([instance.primary_node],
                                             [instance.hypervisor])
         ins_l = ins_l[instance.primary_node]
         if not type(ins_l) is list:
           raise errors.OpExecError("Can't contact node '%s'" %
                                    instance.primary_node)
         if instance.name in ins_l:
           raise errors.OpExecError("Instance is running, can't shutdown"
                                    " block devices.")
         _ShutdownInstanceDisks(lu, instance)
       def _ShutdownInstanceDisks(lu, instance, 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.
         """
         result = True
         for disk in instance.disks:
           for node, top_disk in disk.ComputeNodeTree(instance.primary_node):
             lu.cfg.SetDiskID(top_disk, node)
             if not lu.rpc.call_blockdev_shutdown(node, top_disk):
               logger.Error("could not shutdown block device %s on node %s" %
                            (disk.iv_name, node))
               if not ignore_primary or node != instance.primary_node:
                 result = False
         return result
       def _CheckNodeFreeMemory(lu, node, reason, requested, hypervisor):
         """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: C{str}
         @param hypervisor: 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)
         if not nodeinfo or not isinstance(nodeinfo, dict):
           raise errors.OpPrereqError("Could not contact node %s for resource"
                                    " information" % (node,))
         free_mem = nodeinfo[node].get('memory_free')
         if not isinstance(free_mem, int):
           raise errors.OpPrereqError("Can't compute free memory on node %s, result"
                                    " was '%s'" % (node, free_mem))
         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))
       class LUStartupInstance(LogicalUnit):
         """Starts an instance.
         """
         HPATH = "instance-start"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_REQP = ["instance_name", "force"]
         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 = {
             "FORCE": self.op.force,
+            }
           env.update(_BuildInstanceHookEnvByObject(self.instance))
           nl = ([self.cfg.GetMasterNode(), self.instance.primary_node] +
                 list(self.instance.secondary_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
           # check bridges existance
           _CheckInstanceBridgesExist(self, instance)
           _CheckNodeFreeMemory(self, instance.primary_node,
                                "starting instance %s" % instance.name,
                                instance.memory, instance.hypervisor)
         def Exec(self, feedback_fn):
           """Start the instance.
           """
           instance = self.instance
           force = self.op.force
           extra_args = getattr(self.op, "extra_args", "")
           self.cfg.MarkInstanceUp(instance.name)
           node_current = instance.primary_node
           _StartInstanceDisks(self, instance, force)
           if not self.rpc.call_instance_start(node_current, instance, extra_args):
             _ShutdownInstanceDisks(self, instance)
             raise errors.OpExecError("Could not start instance")
       class LURebootInstance(LogicalUnit):
         """Reboot an instance.
         """
         HPATH = "instance-reboot"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_REQP = ["instance_name", "ignore_secondaries", "reboot_type"]
         REQ_BGL = False
         def ExpandNames(self):
           if self.op.reboot_type not in [constants.INSTANCE_REBOOT_SOFT,
                                          constants.INSTANCE_REBOOT_HARD,
                                          constants.INSTANCE_REBOOT_FULL]:
             raise errors.ParameterError("reboot type not in [%s, %s, %s]" %
                                         (constants.INSTANCE_REBOOT_SOFT,
                                          constants.INSTANCE_REBOOT_HARD,
                                          constants.INSTANCE_REBOOT_FULL))
           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:
             primary_only = not constants.INSTANCE_REBOOT_FULL
             self._LockInstancesNodes(primary_only=primary_only)
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on master, primary and secondary nodes of the instance.
           """
           env = {
             "IGNORE_SECONDARIES": self.op.ignore_secondaries,
+            }
           env.update(_BuildInstanceHookEnvByObject(self.instance))
           nl = ([self.cfg.GetMasterNode(), self.instance.primary_node] +
                 list(self.instance.secondary_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
           # check bridges existance
           _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
           extra_args = getattr(self.op, "extra_args", "")
           node_current = instance.primary_node
           if reboot_type in [constants.INSTANCE_REBOOT_SOFT,
                              constants.INSTANCE_REBOOT_HARD]:
             if not self.rpc.call_instance_reboot(node_current, instance,
                                                  reboot_type, extra_args):
               raise errors.OpExecError("Could not reboot instance")
           else:
             if not self.rpc.call_instance_shutdown(node_current, instance):
               raise errors.OpExecError("could not shutdown instance for full reboot")
             _ShutdownInstanceDisks(self, instance)
             _StartInstanceDisks(self, instance, ignore_secondaries)
             if not self.rpc.call_instance_start(node_current, instance, extra_args):
               _ShutdownInstanceDisks(self, instance)
               raise errors.OpExecError("Could not start instance for full reboot")
           self.cfg.MarkInstanceUp(instance.name)
       class LUShutdownInstance(LogicalUnit):
         """Shutdown an instance.
         """
         HPATH = "instance-stop"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_REQP = ["instance_name"]
         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.instance)
           nl = ([self.cfg.GetMasterNode(), self.instance.primary_node] +
                 list(self.instance.secondary_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
         def Exec(self, feedback_fn):
           """Shutdown the instance.
           """
           instance = self.instance
           node_current = instance.primary_node
           self.cfg.MarkInstanceDown(instance.name)
           if not self.rpc.call_instance_shutdown(node_current, instance):
             logger.Error("could not shutdown instance")
           _ShutdownInstanceDisks(self, instance)
       class LUReinstallInstance(LogicalUnit):
         """Reinstall an instance.
         """
         HPATH = "instance-reinstall"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_REQP = ["instance_name"]
         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.instance)
           nl = ([self.cfg.GetMasterNode(), self.instance.primary_node] +
                 list(self.instance.secondary_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
           if instance.disk_template == constants.DT_DISKLESS:
             raise errors.OpPrereqError("Instance '%s' has no disks" %
                                        self.op.instance_name)
           if instance.status != "down":
             raise errors.OpPrereqError("Instance '%s' is marked to be up" %
                                        self.op.instance_name)
           remote_info = self.rpc.call_instance_info(instance.primary_node,
                                                     instance.name,
                                                     instance.hypervisor)
           if remote_info:
             raise errors.OpPrereqError("Instance '%s' is running on the node %s" %
                                        (self.op.instance_name,
                                         instance.primary_node))
           self.op.os_type = getattr(self.op, "os_type", None)
           if self.op.os_type is not None:
             # OS verification
             pnode = self.cfg.GetNodeInfo(
               self.cfg.ExpandNodeName(instance.primary_node))
             if pnode is None:
               raise errors.OpPrereqError("Primary node '%s' is unknown" %
                                          self.op.pnode)
             os_obj = self.rpc.call_os_get(pnode.name, self.op.os_type)
             if not os_obj:
               raise errors.OpPrereqError("OS '%s' not in supported OS list for"
                                          " primary node"  % self.op.os_type)
           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)
           _StartInstanceDisks(self, inst, None)
           try:
             feedback_fn("Running the instance OS create scripts...")
             if not self.rpc.call_instance_os_add(inst.primary_node, inst,
                                                  "sda", "sdb"):
               raise errors.OpExecError("Could not install OS for instance %s"
                                        " on node %s" %
                                        (inst.name, inst.primary_node))
           finally:
             _ShutdownInstanceDisks(self, inst)
       class LURenameInstance(LogicalUnit):
         """Rename an instance.
         """
         HPATH = "instance-rename"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_REQP = ["instance_name", "new_name"]
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on master, primary and secondary nodes of the instance.
           """
           env = _BuildInstanceHookEnvByObject(self.instance)
           env["INSTANCE_NEW_NAME"] = self.op.new_name
           nl = ([self.cfg.GetMasterNode(), self.instance.primary_node] +
                 list(self.instance.secondary_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.cfg.ExpandInstanceName(self.op.instance_name))
           if instance is None:
             raise errors.OpPrereqError("Instance '%s' not known" %
                                        self.op.instance_name)
           if instance.status != "down":
             raise errors.OpPrereqError("Instance '%s' is marked to be up" %
                                        self.op.instance_name)
           remote_info = self.rpc.call_instance_info(instance.primary_node,
                                                     instance.name,
                                                     instance.hypervisor)
           if remote_info:
             raise errors.OpPrereqError("Instance '%s' is running on the node %s" %
                                        (self.op.instance_name,
                                         instance.primary_node))
           self.instance = instance
           # new name verification
           name_info = utils.HostInfo(self.op.new_name)
           self.op.new_name = new_name = name_info.name
           instance_list = self.cfg.GetInstanceList()
           if new_name in instance_list:
             raise errors.OpPrereqError("Instance '%s' is already in the cluster" %
                                        new_name)
           if not getattr(self.op, "ignore_ip", False):
             if utils.TcpPing(name_info.ip, constants.DEFAULT_NODED_PORT):
               raise errors.OpPrereqError("IP %s of instance %s already in use" %
                                          (name_info.ip, new_name))
         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, inst.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)
             if not result:
               raise errors.OpExecError("Could not connect to node '%s' to rename"
                                        " directory '%s' to '%s' (but the instance"
                                        " has been renamed in Ganeti)" % (
                                        inst.primary_node, old_file_storage_dir,
                                        new_file_storage_dir))
             if not result[0]:
               raise errors.OpExecError("Could not rename directory '%s' to '%s'"
                                        " (but the instance has been renamed in"
                                        " Ganeti)" % (old_file_storage_dir,
                                                      new_file_storage_dir))
           _StartInstanceDisks(self, inst, None)
           try:
             if not self.rpc.call_instance_run_rename(inst.primary_node, inst,
                                                      old_name,
                                                      "sda", "sdb"):
               msg = ("Could not run OS rename script for instance %s on node %s"
                      " (but the instance has been renamed in Ganeti)" %
                      (inst.name, inst.primary_node))
               logger.Error(msg)
           finally:
             _ShutdownInstanceDisks(self, inst)
       class LURemoveInstance(LogicalUnit):
         """Remove an instance.
         """
         HPATH = "instance-remove"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_REQP = ["instance_name", "ignore_failures"]
         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.instance)
           nl = [self.cfg.GetMasterNode()]
           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
         def Exec(self, feedback_fn):
           """Remove the instance.
           """
           instance = self.instance
           logger.Info("shutting down instance %s on node %s" %
                       (instance.name, instance.primary_node))
           if not self.rpc.call_instance_shutdown(instance.primary_node, instance):
             if self.op.ignore_failures:
               feedback_fn("Warning: can't shutdown instance")
             else:
               raise errors.OpExecError("Could not shutdown instance %s on node %s" %
                                        (instance.name, instance.primary_node))
           logger.Info("removing block devices for instance %s" % instance.name)
           if not _RemoveDisks(self, instance):
             if self.op.ignore_failures:
               feedback_fn("Warning: can't remove instance's disks")
             else:
               raise errors.OpExecError("Can't remove instance's disks")
           logger.Info("removing instance %s out of cluster config" % instance.name)
           self.cfg.RemoveInstance(instance.name)
           self.remove_locks[locking.LEVEL_INSTANCE] = instance.name
       class LUQueryInstances(NoHooksLU):
         """Logical unit for querying instances.
         """
         _OP_REQP = ["output_fields", "names"]
         REQ_BGL = False
         def ExpandNames(self):
           self.dynamic_fields = frozenset(["oper_state", "oper_ram", "status"])
           self.static_fields = frozenset([
             "name", "os", "pnode", "snodes",
             "admin_state", "admin_ram",
             "disk_template", "ip", "mac", "bridge",
             "sda_size", "sdb_size", "vcpus", "tags",
             "network_port",
             "serial_no", "hypervisor", "hvparams",
             ] + ["hv/%s" % name for name in constants.HVS_PARAMETERS])
           _CheckOutputFields(static=self.static_fields,
                              dynamic=self.dynamic_fields,
                              selected=self.op.output_fields)
           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_locking = not self.static_fields.issuperset(self.op.output_fields)
           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 CheckPrereq(self):
           """Check prerequisites.
           """
           pass
         def Exec(self, feedback_fn):
           """Computes the list of nodes and their attributes.
           """
           all_info = self.cfg.GetAllInstancesInfo()
           if self.do_locking:
             instance_names = self.acquired_locks[locking.LEVEL_INSTANCE]
           elif self.wanted != locking.ALL_SET:
             instance_names = self.wanted
             missing = set(instance_names).difference(all_info.keys())
             if missing:
               raise errors.OpExecError(
                 "Some instances were removed before retrieving their data: %s"
                 % missing)
           else:
             instance_names = all_info.keys()
           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 = []
           if self.dynamic_fields.intersection(self.op.output_fields):
             live_data = {}
             node_data = self.rpc.call_all_instances_info(nodes, hv_list)
             for name in nodes:
               result = node_data[name]
               if result:
                 live_data.update(result)
               elif result == False:
                 bad_nodes.append(name)
               # else no instance is alive
           else:
             live_data = dict([(name, {}) for name in instance_names])
           # end data gathering
           HVPREFIX = "hv/"
           output = []
           for instance in instance_list:
             iout = []
             i_hv = self.cfg.GetClusterInfo().FillHV(instance)
             for field in self.op.output_fields:
               if field == "name":
                 val = instance.name
               elif field == "os":
                 val = instance.os
               elif field == "pnode":
                 val = instance.primary_node
               elif field == "snodes":
                 val = list(instance.secondary_nodes)
               elif field == "admin_state":
                 val = (instance.status != "down")
               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 bad_nodes:
                   val = "ERROR_nodedown"
                 else:
                   running = bool(live_data.get(instance.name))
                   if running:
                     if instance.status != "down":
                       val = "running"
                     else:
                       val = "ERROR_up"
                   else:
                     if instance.status != "down":
                       val = "ERROR_down"
                     else:
                       val = "ADMIN_down"
               elif field == "admin_ram":
                 val = instance.memory
               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 == "disk_template":
                 val = instance.disk_template
               elif field == "ip":
                 val = instance.nics[0].ip
               elif field == "bridge":
                 val = instance.nics[0].bridge
               elif field == "mac":
                 val = instance.nics[0].mac
               elif field == "sda_size" or field == "sdb_size":
                 disk = instance.FindDisk(field[:3])
                 if disk is None:
                   val = None
                 else:
                   val = disk.size
               elif field == "vcpus":
                 val = instance.vcpus
               elif field == "tags":
                 val = list(instance.GetTags())
               elif field == "serial_no":
                 val = instance.serial_no
               elif field == "network_port":
                 val = instance.network_port
               elif (field.startswith(HVPREFIX) and
                     field[len(HVPREFIX):] in constants.HVS_PARAMETERS):
                 val = i_hv.get(field[len(HVPREFIX):], None)
               elif field == "hvparams":
                 val = i_hv
               elif field == "hypervisor":
                 val = instance.hypervisor
               else:
                 raise errors.ParameterError(field)
               iout.append(val)
             output.append(iout)
           return output
       class LUFailoverInstance(LogicalUnit):
         """Failover an instance.
         """
         HPATH = "instance-failover"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_REQP = ["instance_name", "ignore_consistency"]
         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 = {
             "IGNORE_CONSISTENCY": self.op.ignore_consistency,
+            }
           env.update(_BuildInstanceHookEnvByObject(self.instance))
           nl = [self.cfg.GetMasterNode()] + list(self.instance.secondary_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
           if instance.disk_template not in constants.DTS_NET_MIRROR:
             raise errors.OpPrereqError("Instance's disk layout is not"
                                        " network mirrored, cannot failover.")
           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]
           # check memory requirements on the secondary node
           _CheckNodeFreeMemory(self, target_node, "failing over instance %s" %
                                instance.name, instance.memory,
                                instance.hypervisor)
           # check bridge existance
           brlist = [nic.bridge for nic in instance.nics]
           if not self.rpc.call_bridges_exist(target_node, brlist):
             raise errors.OpPrereqError("One or more target bridges %s does not"
                                        " exist on destination node '%s'" %
                                        (brlist, 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]
           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 instance.status == "up" and not self.op.ignore_consistency:
                 raise errors.OpExecError("Disk %s is degraded on target node,"
                                          " aborting failover." % dev.iv_name)
           feedback_fn("* shutting down instance on source node")
           logger.Info("Shutting down instance %s on node %s" %
                       (instance.name, source_node))
           if not self.rpc.call_instance_shutdown(source_node, instance):
             if self.op.ignore_consistency:
               logger.Error("Could not shutdown instance %s on node %s. Proceeding"
                            " anyway. Please make sure node %s is down"  %
                            (instance.name, source_node, source_node))
             else:
               raise errors.OpExecError("Could not shutdown instance %s on node %s" %
                                        (instance.name, source_node))
           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)
           # Only start the instance if it's marked as up
           if instance.status == "up":
             feedback_fn("* activating the instance's disks on target node")
             logger.Info("Starting instance %s on node %s" %
                         (instance.name, target_node))
             disks_ok, dummy = _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")
             if not self.rpc.call_instance_start(target_node, instance, None):
               _ShutdownInstanceDisks(self, instance)
               raise errors.OpExecError("Could not start instance %s on node %s." %
                                        (instance.name, target_node))
       def _CreateBlockDevOnPrimary(lu, node, instance, device, info):
         """Create a tree of block devices on the primary node.
         This always creates all devices.
         """
         if device.children:
           for child in device.children:
             if not _CreateBlockDevOnPrimary(lu, node, instance, child, info):
               return False
         lu.cfg.SetDiskID(device, node)
         new_id = lu.rpc.call_blockdev_create(node, device, device.size,
                                              instance.name, True, info)
         if not new_id:
           return False
         if device.physical_id is None:
           device.physical_id = new_id
         return True
       def _CreateBlockDevOnSecondary(lu, node, instance, device, force, info):
         """Create a tree of block devices on a secondary 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.
         """
         if device.CreateOnSecondary():
           force = True
         if device.children:
           for child in device.children:
             if not _CreateBlockDevOnSecondary(lu, node, instance,
                                               child, force, info):
               return False
         if not force:
           return True
         lu.cfg.SetDiskID(device, node)
         new_id = lu.rpc.call_blockdev_create(node, device, device.size,
                                              instance.name, False, info)
         if not new_id:
           return False
         if device.physical_id is None:
           device.physical_id = new_id
         return True
       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()
           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()
         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_sz, swap_sz,
                                 file_storage_dir, file_driver):
         """Generate the entire disk layout for a given template type.
         """
         #TODO: compute space requirements
         vgname = lu.cfg.GetVGName()
         if template_name == constants.DT_DISKLESS:
           disks = []
         elif template_name == constants.DT_PLAIN:
           if len(secondary_nodes) != 0:
             raise errors.ProgrammerError("Wrong template configuration")
           names = _GenerateUniqueNames(lu, [".sda", ".sdb"])
           sda_dev = objects.Disk(dev_type=constants.LD_LV, size=disk_sz,
                                  logical_id=(vgname, names[0]),
                                  iv_name = "sda")
           sdb_dev = objects.Disk(dev_type=constants.LD_LV, size=swap_sz,
                                  logical_id=(vgname, names[1]),
                                  iv_name = "sdb")
           disks = [sda_dev, sdb_dev]
         elif template_name == constants.DT_DRBD8:
           if len(secondary_nodes) != 1:
             raise errors.ProgrammerError("Wrong template configuration")
           remote_node = secondary_nodes[0]
           (minor_pa, minor_pb,
            minor_sa, minor_sb) = lu.cfg.AllocateDRBDMinor(
             [primary_node, primary_node, remote_node, remote_node], instance_name)
           names = _GenerateUniqueNames(lu, [".sda_data", ".sda_meta",
                                             ".sdb_data", ".sdb_meta"])
           drbd_sda_dev = _GenerateDRBD8Branch(lu, primary_node, remote_node,
                                               disk_sz, names[0:2], "sda",
                                               minor_pa, minor_sa)
           drbd_sdb_dev = _GenerateDRBD8Branch(lu, primary_node, remote_node,
                                               swap_sz, names[2:4], "sdb",
                                               minor_pb, minor_sb)
           disks = [drbd_sda_dev, drbd_sdb_dev]
         elif template_name == constants.DT_FILE:
           if len(secondary_nodes) != 0:
             raise errors.ProgrammerError("Wrong template configuration")
           file_sda_dev = objects.Disk(dev_type=constants.LD_FILE, size=disk_sz,
                                       iv_name="sda", logical_id=(file_driver,
                                       "%s/sda" % file_storage_dir))
           file_sdb_dev = objects.Disk(dev_type=constants.LD_FILE, size=swap_sz,
                                       iv_name="sdb", logical_id=(file_driver,
                                       "%s/sdb" % file_storage_dir))
           disks = [file_sda_dev, file_sdb_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):
         """Create all disks for an instance.
         This abstracts away some work from AddInstance.
         Args:
           instance: the instance object
         Returns:
           True or False showing the success of the creation process
         """
         info = _GetInstanceInfoText(instance)
         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(instance.primary_node,
                                                        file_storage_dir)
           if not result:
             logger.Error("Could not connect to node '%s'" % instance.primary_node)
             return False
           if not result[0]:
             logger.Error("failed to create directory '%s'" % file_storage_dir)
             return False
         for device in instance.disks:
           logger.Info("creating volume %s for instance %s" %
                       (device.iv_name, instance.name))
           #HARDCODE
           for secondary_node in instance.secondary_nodes:
             if not _CreateBlockDevOnSecondary(lu, secondary_node, instance,
                                               device, False, info):
               logger.Error("failed to create volume %s (%s) on secondary node %s!" %
                            (device.iv_name, device, secondary_node))
               return False
           #HARDCODE
           if not _CreateBlockDevOnPrimary(lu, instance.primary_node,
                                           instance, device, info):
             logger.Error("failed to create volume %s on primary!" %
                          device.iv_name)
             return False
         return True
       def _RemoveDisks(lu, instance):
         """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()`).
         Args:
           instance: the instance object
         Returns:
           True or False showing the success of the removal proces
         """
         logger.Info("removing block devices for instance %s" % instance.name)
         result = True
         for device in instance.disks:
           for node, disk in device.ComputeNodeTree(instance.primary_node):
             lu.cfg.SetDiskID(disk, node)
             if not lu.rpc.call_blockdev_remove(node, disk):
               logger.Error("could not remove block device %s on node %s,"
                            " continuing anyway" %
                            (device.iv_name, node))
               result = False
         if instance.disk_template == constants.DT_FILE:
           file_storage_dir = os.path.dirname(instance.disks[0].logical_id[1])
           if not lu.rpc.call_file_storage_dir_remove(instance.primary_node,
                                                      file_storage_dir):
             logger.Error("could not remove directory '%s'" % file_storage_dir)
             result = False
         return result
       def _ComputeDiskSize(disk_template, disk_size, swap_size):
         """Compute disk size requirements in the volume group
         This is currently hard-coded for the two-drive layout.
         """
         # Required free disk space as a function of disk and swap space
         req_size_dict = {
           constants.DT_DISKLESS: None,
           constants.DT_PLAIN: disk_size + swap_size,
           # 256 MB are added for drbd metadata, 128MB for each drbd device
           constants.DT_DRBD8: disk_size + swap_size + 256,
           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.get(node, None)
           if not info or not isinstance(info, (tuple, list)):
             raise errors.OpPrereqError("Cannot get current information"
                                        " from node '%s' (%s)" % (node, info))
           if not info[0]:
             raise errors.OpPrereqError("Hypervisor parameter validation failed:"
                                        " %s" % info[1])
       class LUCreateInstance(LogicalUnit):
         """Create an instance.
         """
         HPATH = "instance-add"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_REQP = ["instance_name", "mem_size", "disk_size",
                     "disk_template", "swap_size", "mode", "start", "vcpus",
                     "wait_for_sync", "ip_check", "mac", "hvparams"]
         REQ_BGL = False
         def _ExpandNode(self, node):
           """Expands and checks one node name.
           """
           node_full = self.cfg.ExpandNodeName(node)
           if node_full is None:
             raise errors.OpPrereqError("Unknown node %s" % node)
           return node_full
         def ExpandNames(self):
           """ExpandNames for CreateInstance.
           Figure out the right locks for instance creation.
           """
           self.needed_locks = {}
           # set optional parameters to none if they don't exist
           for attr in ["pnode", "snode", "iallocator", "hypervisor"]:
             if not hasattr(self.op, attr):
               setattr(self.op, attr, None)
           # cheap checks, mostly valid constants given
           # verify creation mode
           if self.op.mode not in (constants.INSTANCE_CREATE,
                                   constants.INSTANCE_IMPORT):
             raise errors.OpPrereqError("Invalid instance creation mode '%s'" %
                                        self.op.mode)
           # disk template and mirror node verification
           if self.op.disk_template not in constants.DISK_TEMPLATES:
             raise errors.OpPrereqError("Invalid disk template name")
           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)))
           # check hypervisor parameter syntax (locally)
           filled_hvp = cluster.FillDict(cluster.hvparams[self.op.hypervisor],
                                         self.op.hvparams)
           hv_type = hypervisor.GetHypervisor(self.op.hypervisor)
           hv_type.CheckParameterSyntax(filled_hvp)
           #### instance parameters check
           # instance name verification
           hostname1 = utils.HostInfo(self.op.instance_name)
           self.op.instance_name = instance_name = hostname1.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)
           self.add_locks[locking.LEVEL_INSTANCE] = instance_name
           # ip validity checks
           ip = getattr(self.op, "ip", None)
           if ip is None or ip.lower() == "none":
             inst_ip = None
           elif ip.lower() == "auto":
             inst_ip = hostname1.ip
           else:
             if not utils.IsValidIP(ip):
               raise errors.OpPrereqError("given IP address '%s' doesn't look"
                                          " like a valid IP" % ip)
             inst_ip = ip
           self.inst_ip = self.op.ip = inst_ip
           # used in CheckPrereq for ip ping check
           self.check_ip = hostname1.ip
           # MAC address verification
           if self.op.mac != "auto":
             if not utils.IsValidMac(self.op.mac.lower()):
               raise errors.OpPrereqError("invalid MAC address specified: %s" %
                                          self.op.mac)
           # 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)
           if self.op.file_storage_dir and os.path.isabs(self.op.file_storage_dir):
             raise errors.OpPrereqError("File storage directory path not absolute")
           ### Node/iallocator related checks
           if [self.op.iallocator, self.op.pnode].count(None) != 1:
             raise errors.OpPrereqError("One and only one of iallocator and primary"
                                        " node must be given")
           if self.op.iallocator:
             self.needed_locks[locking.LEVEL_NODE] = locking.ALL_SET
           else:
             self.op.pnode = self._ExpandNode(self.op.pnode)
             nodelist = [self.op.pnode]
             if self.op.snode is not None:
               self.op.snode = self._ExpandNode(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 = getattr(self.op, "src_node", None)
             src_path = getattr(self.op, "src_path", None)
             if src_node is None or src_path is None:
               raise errors.OpPrereqError("Importing an instance requires source"
                                          " node and path options")
             if not os.path.isabs(src_path):
               raise errors.OpPrereqError("The source path must be absolute")
             self.op.src_node = src_node = self._ExpandNode(src_node)
             if self.needed_locks[locking.LEVEL_NODE] is not locking.ALL_SET:
               self.needed_locks[locking.LEVEL_NODE].append(src_node)
           else: # INSTANCE_CREATE
             if getattr(self.op, "os_type", None) is None:
               raise errors.OpPrereqError("No guest OS specified")
         def _RunAllocator(self):
           """Run the allocator based on input opcode.
           """
           disks = [{"size": self.op.disk_size, "mode": "w"},
                    {"size": self.op.swap_size, "mode": "w"}]
           nics = [{"mac": self.op.mac, "ip": getattr(self.op, "ip", None),
                    "bridge": self.op.bridge}]
           ial = IAllocator(self,
                            mode=constants.IALLOCATOR_MODE_ALLOC,
                            name=self.op.instance_name,
                            disk_template=self.op.disk_template,
                            tags=[],
                            os=self.op.os_type,
                            vcpus=self.op.vcpus,
                            mem_size=self.op.mem_size,
                            disks=disks,
                            nics=nics,
+                           )
           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))
           if len(ial.nodes) != ial.required_nodes:
             raise errors.OpPrereqError("iallocator '%s' returned invalid number"
                                        " of nodes (%s), required %s" %
                                        (self.op.iallocator, len(ial.nodes),
                                         ial.required_nodes))
           self.op.pnode = ial.nodes[0]
           logger.ToStdout("Selected nodes for the instance: %s" %
                           (", ".join(ial.nodes),))
           logger.Info("Selected nodes for instance %s via iallocator %s: %s" %
                       (self.op.instance_name, self.op.iallocator, ial.nodes))
           if ial.required_nodes == 2:
             self.op.snode = ial.nodes[1]
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on master, primary and secondary nodes of the instance.
           """
           env = {
             "INSTANCE_DISK_TEMPLATE": self.op.disk_template,
             "INSTANCE_DISK_SIZE": self.op.disk_size,
             "INSTANCE_SWAP_SIZE": self.op.swap_size,
             "INSTANCE_ADD_MODE": self.op.mode,
+            }
           if self.op.mode == constants.INSTANCE_IMPORT:
             env["INSTANCE_SRC_NODE"] = self.op.src_node
             env["INSTANCE_SRC_PATH"] = self.op.src_path
             env["INSTANCE_SRC_IMAGE"] = self.src_image
           env.update(_BuildInstanceHookEnv(name=self.op.instance_name,
             primary_node=self.op.pnode,
             secondary_nodes=self.secondaries,
             status=self.instance_status,
             os_type=self.op.os_type,
             memory=self.op.mem_size,
             vcpus=self.op.vcpus,
             nics=[(self.inst_ip, self.op.bridge, self.op.mac)],
           ))
           nl = ([self.cfg.GetMasterNode(), self.op.pnode] +
                 self.secondaries)
           return env, nl, nl
         def CheckPrereq(self):
           """Check prerequisites.
           """
           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")
           if self.op.mode == constants.INSTANCE_IMPORT:
             src_node = self.op.src_node
             src_path = self.op.src_path
             export_info = self.rpc.call_export_info(src_node, src_path)
             if not export_info:
               raise errors.OpPrereqError("No export found in dir %s" % src_path)
             if not export_info.has_section(constants.INISECT_EXP):
               raise errors.ProgrammerError("Corrupted export config")
             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))
             if int(export_info.get(constants.INISECT_INS, 'disk_count')) > 1:
               raise errors.OpPrereqError("Can't import instance with more than"
                                          " one data disk")
             # FIXME: are the old os-es, disk sizes, etc. useful?
             self.op.os_type = export_info.get(constants.INISECT_EXP, 'os')
             diskimage = os.path.join(src_path, export_info.get(constants.INISECT_INS,
                                                                'disk0_dump'))
             self.src_image = diskimage
           # ip ping checks (we use the same ip that was resolved in ExpandNames)
           if self.op.start and not self.op.ip_check:
             raise errors.OpPrereqError("Cannot ignore IP address conflicts when"
                                        " adding an instance in start mode")
           if self.op.ip_check:
             if utils.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))
           # bridge verification
           bridge = getattr(self.op, "bridge", None)
           if bridge is None:
             self.op.bridge = self.cfg.GetDefBridge()
           else:
             self.op.bridge = bridge
           #### 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
           self.secondaries = []
           # mirror node verification
           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")
             if self.op.snode == pnode.name:
               raise errors.OpPrereqError("The secondary node cannot be"
                                          " the primary node.")
             self.secondaries.append(self.op.snode)
           nodenames = [pnode.name] + self.secondaries
           req_size = _ComputeDiskSize(self.op.disk_template,
                                       self.op.disk_size, self.op.swap_size)
           # Check lv size requirements
           if req_size is not None:
             nodeinfo = self.rpc.call_node_info(nodenames, self.cfg.GetVGName(),
                                                self.op.hypervisor)
             for node in nodenames:
               info = nodeinfo.get(node, None)
               if not info:
                 raise errors.OpPrereqError("Cannot get current information"
                                            " from node '%s'" % node)
               vg_free = info.get('vg_free', None)
               if not isinstance(vg_free, int):
                 raise errors.OpPrereqError("Can't compute free disk space on"
                                            " node %s" % node)
               if req_size > info['vg_free']:
                 raise errors.OpPrereqError("Not enough disk space on target node %s."
                                            " %d MB available, %d MB required" %
                                            (node, info['vg_free'], req_size))
           _CheckHVParams(self, nodenames, self.op.hypervisor, self.op.hvparams)
           # os verification
           os_obj = self.rpc.call_os_get(pnode.name, self.op.os_type)
           if not os_obj:
             raise errors.OpPrereqError("OS '%s' not in supported os list for"
                                        " primary node"  % self.op.os_type)
           # bridge check on primary node
           if not self.rpc.call_bridges_exist(self.pnode.name, [self.op.bridge]):
             raise errors.OpPrereqError("target bridge '%s' does not exist on"
                                        " destination node '%s'" %
                                        (self.op.bridge, pnode.name))
           # memory check on primary node
           if self.op.start:
             _CheckNodeFreeMemory(self, self.pnode.name,
                                  "creating instance %s" % self.op.instance_name,
                                  self.op.mem_size, self.op.hypervisor)
           if self.op.start:
             self.instance_status = 'up'
           else:
             self.instance_status = 'down'
         def Exec(self, feedback_fn):
           """Create and add the instance to the cluster.
           """
           instance = self.op.instance_name
           pnode_name = self.pnode.name
           if self.op.mac == "auto":
             mac_address = self.cfg.GenerateMAC()
           else:
             mac_address = self.op.mac
           nic = objects.NIC(bridge=self.op.bridge, mac=mac_address)
           if self.inst_ip is not None:
             nic.ip = self.inst_ip
           ht_kind = self.op.hypervisor
           if ht_kind in constants.HTS_REQ_PORT:
             network_port = self.cfg.AllocatePort()
           else:
             network_port = None
           ##if self.op.vnc_bind_address is None:
           ##  self.op.vnc_bind_address = constants.VNC_DEFAULT_BIND_ADDRESS
           # 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 = os.path.normpath(os.path.join(
                                               self.cfg.GetFileStorageDir(),
                                               string_file_storage_dir, instance))
           disks = _GenerateDiskTemplate(self,
                                         self.op.disk_template,
                                         instance, pnode_name,
                                         self.secondaries, self.op.disk_size,
                                         self.op.swap_size,
                                         file_storage_dir,
                                         self.op.file_driver)
           iobj = objects.Instance(name=instance, os=self.op.os_type,
                                   primary_node=pnode_name,
                                   memory=self.op.mem_size,
                                   vcpus=self.op.vcpus,
                                   nics=[nic], disks=disks,
                                   disk_template=self.op.disk_template,
                                   status=self.instance_status,
                                   network_port=network_port,
                                   hvparams=self.op.hvparams,
                                   hypervisor=self.op.hypervisor,
+                                  )
           feedback_fn("* creating instance disks...")
           if not _CreateDisks(self, iobj):
             _RemoveDisks(self, iobj)
             self.cfg.ReleaseDRBDMinors(instance)
             raise errors.OpExecError("Device creation failed, reverting...")
           feedback_fn("adding instance %s to cluster config" % instance)
           self.cfg.AddInstance(iobj)
           # 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]
           # Remove the temp. assignements for the instance's drbds
           self.cfg.ReleaseDRBDMinors(instance)
           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")
           feedback_fn("creating os for instance %s on node %s" %
                       (instance, pnode_name))
           if iobj.disk_template != constants.DT_DISKLESS:
             if self.op.mode == constants.INSTANCE_CREATE:
               feedback_fn("* running the instance OS create scripts...")
               if not self.rpc.call_instance_os_add(pnode_name, iobj, "sda", "sdb"):
                 raise errors.OpExecError("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...")
               src_node = self.op.src_node
               src_image = self.src_image
               cluster_name = self.cfg.GetClusterName()
               if not self.rpc.call_instance_os_import(pnode_name, iobj, "sda", "sdb",
                                                       src_node, src_image,
                                                       cluster_name):
                 raise errors.OpExecError("Could not import os for instance"
                                          " %s on node %s" %
                                          (instance, pnode_name))
             else:
               # also checked in the prereq part
               raise errors.ProgrammerError("Unknown OS initialization mode '%s'"
                                            % self.op.mode)
           if self.op.start:
             logger.Info("starting instance %s on node %s" % (instance, pnode_name))
             feedback_fn("* starting instance...")
             if not self.rpc.call_instance_start(pnode_name, iobj, None):
               raise errors.OpExecError("Could not start instance")
       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_REQP = ["instance_name"]
         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
         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]
           if node_insts is False:
             raise errors.OpExecError("Can't connect to node %s." % node)
           if instance.name not in node_insts:
             raise errors.OpExecError("Instance %s is not running." % instance.name)
           logger.Debug("connecting to console of %s on %s" % (instance.name, node))
           hyper = hypervisor.GetHypervisor(instance.hypervisor)
           console_cmd = hyper.GetShellCommandForConsole(instance)
           # 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_REQP = ["instance_name", "mode", "disks"]
         REQ_BGL = False
         def ExpandNames(self):
           self._ExpandAndLockInstance()
           if not hasattr(self.op, "remote_node"):
             self.op.remote_node = None
           ia_name = getattr(self.op, "iallocator", None)
           if ia_name is not None:
             if self.op.remote_node is not None:
               raise errors.OpPrereqError("Give either the iallocator or the new"
                                          " secondary, not both")
             self.needed_locks[locking.LEVEL_NODE] = locking.ALL_SET
           elif self.op.remote_node is not None:
             remote_node = self.cfg.ExpandNodeName(self.op.remote_node)
             if remote_node is None:
               raise errors.OpPrereqError("Node '%s' not known" %
                                          self.op.remote_node)
             self.op.remote_node = remote_node
             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
         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 _RunAllocator(self):
           """Compute a new secondary node using an IAllocator.
           """
           ial = IAllocator(self,
                            mode=constants.IALLOCATOR_MODE_RELOC,
                            name=self.op.instance_name,
                            relocate_from=[self.sec_node])
           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))
           if len(ial.nodes) != ial.required_nodes:
             raise errors.OpPrereqError("iallocator '%s' returned invalid number"
                                        " of nodes (%s), required %s" %
                                        (len(ial.nodes), ial.required_nodes))
           self.op.remote_node = ial.nodes[0]
           logger.ToStdout("Selected new secondary for the instance: %s" %
                           self.op.remote_node)
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on the master, the primary and all the secondaries.
           """
           env = {
             "MODE": self.op.mode,
             "NEW_SECONDARY": self.op.remote_node,
             "OLD_SECONDARY": self.instance.secondary_nodes[0],
+            }
           env.update(_BuildInstanceHookEnvByObject(self.instance))
           nl = [
             self.cfg.GetMasterNode(),
             self.instance.primary_node,
+            ]
           if self.op.remote_node is not None:
             nl.append(self.op.remote_node)
           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
           self.instance = instance
           if instance.disk_template not in constants.DTS_NET_MIRROR:
             raise errors.OpPrereqError("Instance's disk layout is not"
                                        " network mirrored.")
           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))
           self.sec_node = instance.secondary_nodes[0]
           ia_name = getattr(self.op, "iallocator", None)
           if ia_name is not None:
             self._RunAllocator()
           remote_node = self.op.remote_node
           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 == instance.primary_node:
             raise errors.OpPrereqError("The specified node is the primary node of"
                                        " the instance.")
           elif remote_node == self.sec_node:
             if self.op.mode == constants.REPLACE_DISK_SEC:
               # this is for DRBD8, where we can't execute the same mode of
               # replacement as for drbd7 (no different port allocated)
               raise errors.OpPrereqError("Same secondary given, cannot execute"
                                          " replacement")
           if instance.disk_template == constants.DT_DRBD8:
             if (self.op.mode == constants.REPLACE_DISK_ALL and
                 remote_node is not None):
               # switch to replace secondary mode
               self.op.mode = constants.REPLACE_DISK_SEC
             if self.op.mode == constants.REPLACE_DISK_ALL:
               raise errors.OpPrereqError("Template 'drbd' only allows primary or"
                                          " secondary disk replacement, not"
                                          " both at once")
             elif self.op.mode == constants.REPLACE_DISK_PRI:
               if remote_node is not None:
                 raise errors.OpPrereqError("Template 'drbd' does not allow changing"
                                            " the secondary while doing a primary"
                                            " node disk replacement")
               self.tgt_node = instance.primary_node
               self.oth_node = instance.secondary_nodes[0]
             elif self.op.mode == constants.REPLACE_DISK_SEC:
               self.new_node = remote_node # this can be None, in which case
                                           # we don't change the secondary
               self.tgt_node = instance.secondary_nodes[0]
               self.oth_node = instance.primary_node
             else:
               raise errors.ProgrammerError("Unhandled disk replace mode")
           for name in self.op.disks:
             if instance.FindDisk(name) is None:
               raise errors.OpPrereqError("Disk '%s' not found for instance '%s'" %
                                          (name, instance.name))
         def _ExecD8DiskOnly(self, feedback_fn):
           """Replace a disk on the primary or secondary for dbrd8.
           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
           warning, info = (self.proc.LogWarning, self.proc.LogInfo)
           instance = self.instance
           iv_names = {}
           vgname = self.cfg.GetVGName()
           # start of work
           cfg = self.cfg
           tgt_node = self.tgt_node
           oth_node = self.oth_node
           # Step: check device activation
           self.proc.LogStep(1, steps_total, "check device existence")
           info("checking volume groups")
           my_vg = cfg.GetVGName()
           results = self.rpc.call_vg_list([oth_node, tgt_node])
           if not results:
             raise errors.OpExecError("Can't list volume groups on the nodes")
           for node in oth_node, tgt_node:
             res = results.get(node, False)
             if not res or my_vg not in res:
               raise errors.OpExecError("Volume group '%s' not found on %s" %
                                        (my_vg, node))
           for dev in instance.disks:
             if not dev.iv_name in self.op.disks:
               continue
             for node in tgt_node, oth_node:
               info("checking %s on %s" % (dev.iv_name, node))
               cfg.SetDiskID(dev, node)
               if not self.rpc.call_blockdev_find(node, dev):
                 raise errors.OpExecError("Can't find device %s on node %s" %
                                          (dev.iv_name, node))
           # Step: check other node consistency
           self.proc.LogStep(2, steps_total, "check peer consistency")
           for dev in instance.disks:
             if not dev.iv_name in self.op.disks:
               continue
             info("checking %s consistency on %s" % (dev.iv_name, oth_node))
             if not _CheckDiskConsistency(self, dev, oth_node,
                                          oth_node==instance.primary_node):
               raise errors.OpExecError("Peer node (%s) has degraded storage, unsafe"
                                        " to replace disks on this node (%s)" %
                                        (oth_node, tgt_node))
           # Step: create new storage
           self.proc.LogStep(3, steps_total, "allocate new storage")
           for dev in instance.disks:
             if not dev.iv_name in self.op.disks:
               continue
             size = dev.size
             cfg.SetDiskID(dev, tgt_node)
             lv_names = [".%s_%s" % (dev.iv_name, suf) for suf in ["data", "meta"]]
             names = _GenerateUniqueNames(self, lv_names)
             lv_data = objects.Disk(dev_type=constants.LD_LV, size=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)
             info("creating new local storage on %s for %s" %
                  (tgt_node, dev.iv_name))
             # since we *always* want to create this LV, we use the
             # _Create...OnPrimary (which forces the creation), even if we
             # are talking about the secondary node
             for new_lv in new_lvs:
               if not _CreateBlockDevOnPrimary(self, tgt_node, instance, new_lv,
                                               _GetInstanceInfoText(instance)):
                 raise errors.OpExecError("Failed to create new LV named '%s' on"
                                          " node '%s'" %
                                          (new_lv.logical_id[1], tgt_node))
           # Step: for each lv, detach+rename*2+attach
           self.proc.LogStep(4, steps_total, "change drbd configuration")
           for dev, old_lvs, new_lvs in iv_names.itervalues():
             info("detaching %s drbd from local storage" % dev.iv_name)
             if not self.rpc.call_blockdev_removechildren(tgt_node, dev, old_lvs):
               raise errors.OpExecError("Can't detach drbd from local storage on node"
                                        " %s for device %s" % (tgt_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
             rlist = []
             for to_ren in old_lvs:
               find_res = self.rpc.call_blockdev_find(tgt_node, to_ren)
               if find_res is not None: # device exists
                 rlist.append((to_ren, ren_fn(to_ren, temp_suffix)))
             info("renaming the old LVs on the target node")
             if not self.rpc.call_blockdev_rename(tgt_node, rlist):
               raise errors.OpExecError("Can't rename old LVs on node %s" % tgt_node)
             # now we rename the new LVs to the old LVs
             info("renaming the new LVs on the target node")
             rlist = [(new, old.physical_id) for old, new in zip(old_lvs, new_lvs)]
             if not self.rpc.call_blockdev_rename(tgt_node, rlist):
               raise errors.OpExecError("Can't rename new LVs on node %s" % tgt_node)
             for old, new in zip(old_lvs, new_lvs):
               new.logical_id = old.logical_id
               cfg.SetDiskID(new, tgt_node)
             for disk in old_lvs:
               disk.logical_id = ren_fn(disk, temp_suffix)
               cfg.SetDiskID(disk, tgt_node)
             # now that the new lvs have the old name, we can add them to the device
             info(

Synnefo » snf-ganeti

root / lib / cmdlib.py @ 8b3fd458