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

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+      #
+      #
       # Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 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.
       """Logical units dealing with the cluster."""
       import OpenSSL
       import copy
       import itertools
       import logging
       import operator
       import os
       import re
       import time
       from ganeti import compat
       from ganeti import constants
       from ganeti import errors
       from ganeti import hypervisor
       from ganeti import locking
       from ganeti import masterd
       from ganeti import netutils
       from ganeti import objects
       from ganeti import opcodes
       from ganeti import pathutils
       from ganeti import query
       from ganeti import rpc
       from ganeti import runtime
       from ganeti import ssh
       from ganeti import uidpool
       from ganeti import utils
       from ganeti import vcluster
       from ganeti.cmdlib.base import NoHooksLU, QueryBase, LogicalUnit, \
         ResultWithJobs
       from ganeti.cmdlib.common import ShareAll, RunPostHook, \
         ComputeAncillaryFiles, RedistributeAncillaryFiles, UploadHelper, \
         GetWantedInstances, MergeAndVerifyHvState, MergeAndVerifyDiskState, \
         GetUpdatedIPolicy, ComputeNewInstanceViolations, GetUpdatedParams, \
         CheckOSParams, CheckHVParams, AdjustCandidatePool, CheckNodePVs, \
         ComputeIPolicyInstanceViolation, AnnotateDiskParams, SupportsOob
       import ganeti.masterd.instance
       class LUClusterActivateMasterIp(NoHooksLU):
         """Activate the master IP on the master node.
         """
         def Exec(self, feedback_fn):
           """Activate the master IP.
           """
           master_params = self.cfg.GetMasterNetworkParameters()
           ems = self.cfg.GetUseExternalMipScript()
           result = self.rpc.call_node_activate_master_ip(master_params.name,
                                                          master_params, ems)
           result.Raise("Could not activate the master IP")
       class LUClusterDeactivateMasterIp(NoHooksLU):
         """Deactivate the master IP on the master node.
         """
         def Exec(self, feedback_fn):
           """Deactivate the master IP.
           """
           master_params = self.cfg.GetMasterNetworkParameters()
           ems = self.cfg.GetUseExternalMipScript()
           result = self.rpc.call_node_deactivate_master_ip(master_params.name,
                                                            master_params, ems)
           result.Raise("Could not deactivate the master IP")
       class LUClusterConfigQuery(NoHooksLU):
         """Return configuration values.
         """
         REQ_BGL = False
         def CheckArguments(self):
           self.cq = ClusterQuery(None, self.op.output_fields, False)
         def ExpandNames(self):
           self.cq.ExpandNames(self)
         def DeclareLocks(self, level):
           self.cq.DeclareLocks(self, level)
         def Exec(self, feedback_fn):
           result = self.cq.OldStyleQuery(self)
           assert len(result) == 1
           return result[0]
       class LUClusterDestroy(LogicalUnit):
         """Logical unit for destroying the cluster.
         """
         HPATH = "cluster-destroy"
         HTYPE = constants.HTYPE_CLUSTER
         def BuildHooksEnv(self):
           """Build hooks env.
           """
           return {
             "OP_TARGET": self.cfg.GetClusterName(),
+            }
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           return ([], [])
         def CheckPrereq(self):
           """Check prerequisites.
           This checks whether the cluster is empty.
           Any errors are signaled by raising errors.OpPrereqError.
           """
           master = self.cfg.GetMasterNode()
           nodelist = self.cfg.GetNodeList()
           if len(nodelist) != 1 or nodelist[0] != master:
             raise errors.OpPrereqError("There are still %d node(s) in"
                                        " this cluster." % (len(nodelist) - 1),
                                        errors.ECODE_INVAL)
           instancelist = self.cfg.GetInstanceList()
           if instancelist:
             raise errors.OpPrereqError("There are still %d instance(s) in"
                                        " this cluster." % len(instancelist),
                                        errors.ECODE_INVAL)
         def Exec(self, feedback_fn):
           """Destroys the cluster.
           """
           master_params = self.cfg.GetMasterNetworkParameters()
           # Run post hooks on master node before it's removed
           RunPostHook(self, master_params.name)
           ems = self.cfg.GetUseExternalMipScript()
           result = self.rpc.call_node_deactivate_master_ip(master_params.name,
                                                            master_params, ems)
           result.Warn("Error disabling the master IP address", self.LogWarning)
           return master_params.name
       class LUClusterPostInit(LogicalUnit):
         """Logical unit for running hooks after cluster initialization.
         """
         HPATH = "cluster-init"
         HTYPE = constants.HTYPE_CLUSTER
         def BuildHooksEnv(self):
           """Build hooks env.
           """
           return {
             "OP_TARGET": self.cfg.GetClusterName(),
+            }
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           return ([], [self.cfg.GetMasterNode()])
         def Exec(self, feedback_fn):
           """Nothing to do.
           """
           return True
       class ClusterQuery(QueryBase):
         FIELDS = query.CLUSTER_FIELDS
         #: Do not sort (there is only one item)
         SORT_FIELD = None
         def ExpandNames(self, lu):
           lu.needed_locks = {}
           # The following variables interact with _QueryBase._GetNames
           self.wanted = locking.ALL_SET
           self.do_locking = self.use_locking
           if self.do_locking:
             raise errors.OpPrereqError("Can not use locking for cluster queries",
                                        errors.ECODE_INVAL)
         def DeclareLocks(self, lu, level):
           pass
         def _GetQueryData(self, lu):
           """Computes the list of nodes and their attributes.
           """
           # Locking is not used
           assert not (compat.any(lu.glm.is_owned(level)
                                  for level in locking.LEVELS
                                  if level != locking.LEVEL_CLUSTER) or
                       self.do_locking or self.use_locking)
           if query.CQ_CONFIG in self.requested_data:
             cluster = lu.cfg.GetClusterInfo()
           else:
             cluster = NotImplemented
           if query.CQ_QUEUE_DRAINED in self.requested_data:
             drain_flag = os.path.exists(pathutils.JOB_QUEUE_DRAIN_FILE)
           else:
             drain_flag = NotImplemented
           if query.CQ_WATCHER_PAUSE in self.requested_data:
             master_name = lu.cfg.GetMasterNode()
             result = lu.rpc.call_get_watcher_pause(master_name)
             result.Raise("Can't retrieve watcher pause from master node '%s'" %
                          master_name)
             watcher_pause = result.payload
           else:
             watcher_pause = NotImplemented
           return query.ClusterQueryData(cluster, drain_flag, watcher_pause)
       class LUClusterQuery(NoHooksLU):
         """Query cluster configuration.
         """
         REQ_BGL = False
         def ExpandNames(self):
           self.needed_locks = {}
         def Exec(self, feedback_fn):
           """Return cluster config.
           """
           cluster = self.cfg.GetClusterInfo()
           os_hvp = {}
           # Filter just for enabled hypervisors
           for os_name, hv_dict in cluster.os_hvp.items():
             os_hvp[os_name] = {}
             for hv_name, hv_params in hv_dict.items():
               if hv_name in cluster.enabled_hypervisors:
                 os_hvp[os_name][hv_name] = hv_params
           # Convert ip_family to ip_version
           primary_ip_version = constants.IP4_VERSION
           if cluster.primary_ip_family == netutils.IP6Address.family:
             primary_ip_version = constants.IP6_VERSION
           result = {
             "software_version": constants.RELEASE_VERSION,
             "protocol_version": constants.PROTOCOL_VERSION,
             "config_version": constants.CONFIG_VERSION,
             "os_api_version": max(constants.OS_API_VERSIONS),
             "export_version": constants.EXPORT_VERSION,
             "architecture": runtime.GetArchInfo(),
             "name": cluster.cluster_name,
             "master": cluster.master_node,
             "default_hypervisor": cluster.primary_hypervisor,
             "enabled_hypervisors": cluster.enabled_hypervisors,
             "hvparams": dict([(hypervisor_name, cluster.hvparams[hypervisor_name])
                               for hypervisor_name in cluster.enabled_hypervisors]),
             "os_hvp": os_hvp,
             "beparams": cluster.beparams,
             "osparams": cluster.osparams,
             "ipolicy": cluster.ipolicy,
             "nicparams": cluster.nicparams,
             "ndparams": cluster.ndparams,
             "diskparams": cluster.diskparams,
             "candidate_pool_size": cluster.candidate_pool_size,
             "master_netdev": cluster.master_netdev,
             "master_netmask": cluster.master_netmask,
             "use_external_mip_script": cluster.use_external_mip_script,
             "volume_group_name": cluster.volume_group_name,
             "drbd_usermode_helper": cluster.drbd_usermode_helper,
             "file_storage_dir": cluster.file_storage_dir,
             "shared_file_storage_dir": cluster.shared_file_storage_dir,
             "maintain_node_health": cluster.maintain_node_health,
             "ctime": cluster.ctime,
             "mtime": cluster.mtime,
             "uuid": cluster.uuid,
             "tags": list(cluster.GetTags()),
             "uid_pool": cluster.uid_pool,
             "default_iallocator": cluster.default_iallocator,
             "reserved_lvs": cluster.reserved_lvs,
             "primary_ip_version": primary_ip_version,
             "prealloc_wipe_disks": cluster.prealloc_wipe_disks,
             "hidden_os": cluster.hidden_os,
             "blacklisted_os": cluster.blacklisted_os,
+            }
           return result
       class LUClusterRedistConf(NoHooksLU):
         """Force the redistribution of cluster configuration.
         This is a very simple LU.
         """
         REQ_BGL = False
         def ExpandNames(self):
           self.needed_locks = {
             locking.LEVEL_NODE: locking.ALL_SET,
             locking.LEVEL_NODE_ALLOC: locking.ALL_SET,
+          }
           self.share_locks = ShareAll()
         def Exec(self, feedback_fn):
           """Redistribute the configuration.
           """
           self.cfg.Update(self.cfg.GetClusterInfo(), feedback_fn)
           RedistributeAncillaryFiles(self)
       class LUClusterRename(LogicalUnit):
         """Rename the cluster.
         """
         HPATH = "cluster-rename"
         HTYPE = constants.HTYPE_CLUSTER
         def BuildHooksEnv(self):
           """Build hooks env.
           """
           return {
             "OP_TARGET": self.cfg.GetClusterName(),
             "NEW_NAME": self.op.name,
+            }
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           return ([self.cfg.GetMasterNode()], self.cfg.GetNodeList())
         def CheckPrereq(self):
           """Verify that the passed name is a valid one.
           """
           hostname = netutils.GetHostname(name=self.op.name,
                                           family=self.cfg.GetPrimaryIPFamily())
           new_name = hostname.name
           self.ip = new_ip = hostname.ip
           old_name = self.cfg.GetClusterName()
           old_ip = self.cfg.GetMasterIP()
           if new_name == old_name and new_ip == old_ip:
             raise errors.OpPrereqError("Neither the name nor the IP address of the"
                                        " cluster has changed",
                                        errors.ECODE_INVAL)
           if new_ip != old_ip:
             if netutils.TcpPing(new_ip, constants.DEFAULT_NODED_PORT):
               raise errors.OpPrereqError("The given cluster IP address (%s) is"
                                          " reachable on the network" %
                                          new_ip, errors.ECODE_NOTUNIQUE)
           self.op.name = new_name
         def Exec(self, feedback_fn):
           """Rename the cluster.
           """
           clustername = self.op.name
           new_ip = self.ip
           # shutdown the master IP
           master_params = self.cfg.GetMasterNetworkParameters()
           ems = self.cfg.GetUseExternalMipScript()
           result = self.rpc.call_node_deactivate_master_ip(master_params.name,
                                                            master_params, ems)
           result.Raise("Could not disable the master role")
           try:
             cluster = self.cfg.GetClusterInfo()
             cluster.cluster_name = clustername
             cluster.master_ip = new_ip
             self.cfg.Update(cluster, feedback_fn)
             # update the known hosts file
             ssh.WriteKnownHostsFile(self.cfg, pathutils.SSH_KNOWN_HOSTS_FILE)
             node_list = self.cfg.GetOnlineNodeList()
             try:
               node_list.remove(master_params.name)
             except ValueError:
               pass
             UploadHelper(self, node_list, pathutils.SSH_KNOWN_HOSTS_FILE)
           finally:
             master_params.ip = new_ip
             result = self.rpc.call_node_activate_master_ip(master_params.name,
                                                            master_params, ems)
             result.Warn("Could not re-enable the master role on the master,"
                         " please restart manually", self.LogWarning)
           return clustername
       class LUClusterRepairDiskSizes(NoHooksLU):
         """Verifies the cluster disks sizes.
         """
         REQ_BGL = False
         def ExpandNames(self):
           if self.op.instances:
             self.wanted_names = GetWantedInstances(self, self.op.instances)
             # Not getting the node allocation lock as only a specific set of
             # instances (and their nodes) is going to be acquired
             self.needed_locks = {
               locking.LEVEL_NODE_RES: [],
               locking.LEVEL_INSTANCE: self.wanted_names,
+              }
             self.recalculate_locks[locking.LEVEL_NODE_RES] = constants.LOCKS_REPLACE
           else:
             self.wanted_names = None
             self.needed_locks = {
               locking.LEVEL_NODE_RES: locking.ALL_SET,
               locking.LEVEL_INSTANCE: locking.ALL_SET,
               # This opcode is acquires the node locks for all instances
               locking.LEVEL_NODE_ALLOC: locking.ALL_SET,
+              }
           self.share_locks = {
             locking.LEVEL_NODE_RES: 1,
             locking.LEVEL_INSTANCE: 0,
             locking.LEVEL_NODE_ALLOC: 1,
+            }
         def DeclareLocks(self, level):
           if level == locking.LEVEL_NODE_RES and self.wanted_names is not None:
             self._LockInstancesNodes(primary_only=True, level=level)
         def CheckPrereq(self):
           """Check prerequisites.
           This only checks the optional instance list against the existing names.
           """
           if self.wanted_names is None:
             self.wanted_names = self.owned_locks(locking.LEVEL_INSTANCE)
           self.wanted_instances = \
               map(compat.snd, self.cfg.GetMultiInstanceInfo(self.wanted_names))
         def _EnsureChildSizes(self, disk):
           """Ensure children of the disk have the needed disk size.
           This is valid mainly for DRBD8 and fixes an issue where the
           children have smaller disk size.
           @param disk: an L{ganeti.objects.Disk} object
           """
           if disk.dev_type == constants.LD_DRBD8:
             assert disk.children, "Empty children for DRBD8?"
             fchild = disk.children[0]
             mismatch = fchild.size < disk.size
             if mismatch:
               self.LogInfo("Child disk has size %d, parent %d, fixing",
                            fchild.size, disk.size)
               fchild.size = disk.size
             # and we recurse on this child only, not on the metadev
             return self._EnsureChildSizes(fchild) or mismatch
           else:
             return False
         def Exec(self, feedback_fn):
           """Verify the size of cluster disks.
           """
           # TODO: check child disks too
           # TODO: check differences in size between primary/secondary nodes
           per_node_disks = {}
           for instance in self.wanted_instances:
             pnode = instance.primary_node
             if pnode not in per_node_disks:
               per_node_disks[pnode] = []
             for idx, disk in enumerate(instance.disks):
               per_node_disks[pnode].append((instance, idx, disk))
           assert not (frozenset(per_node_disks.keys()) -
                       self.owned_locks(locking.LEVEL_NODE_RES)), \
             "Not owning correct locks"
           assert not self.owned_locks(locking.LEVEL_NODE)
           es_flags = rpc.GetExclusiveStorageForNodeNames(self.cfg,
                                                          per_node_disks.keys())
           changed = []
           for node, dskl in per_node_disks.items():
             newl = [v[2].Copy() for v in dskl]
             for dsk in newl:
               self.cfg.SetDiskID(dsk, node)
             result = self.rpc.call_blockdev_getdimensions(node, newl)
             if result.fail_msg:
               self.LogWarning("Failure in blockdev_getdimensions call to node"
                               " %s, ignoring", node)
               continue
             if len(result.payload) != len(dskl):
               logging.warning("Invalid result from node %s: len(dksl)=%d,"
                               " result.payload=%s", node, len(dskl), result.payload)
               self.LogWarning("Invalid result from node %s, ignoring node results",
                               node)
               continue
             for ((instance, idx, disk), dimensions) in zip(dskl, result.payload):
               if dimensions is None:
                 self.LogWarning("Disk %d of instance %s did not return size"
                                 " information, ignoring", idx, instance.name)
                 continue
               if not isinstance(dimensions, (tuple, list)):
                 self.LogWarning("Disk %d of instance %s did not return valid"
                                 " dimension information, ignoring", idx,
                                 instance.name)
                 continue
               (size, spindles) = dimensions
               if not isinstance(size, (int, long)):
                 self.LogWarning("Disk %d of instance %s did not return valid"
                                 " size information, ignoring", idx, instance.name)
                 continue
               size = size >> 20
               if size != disk.size:
                 self.LogInfo("Disk %d of instance %s has mismatched size,"
                              " correcting: recorded %d, actual %d", idx,
                              instance.name, disk.size, size)
                 disk.size = size
                 self.cfg.Update(instance, feedback_fn)
                 changed.append((instance.name, idx, "size", size))
               if es_flags[node]:
                 if spindles is None:
                   self.LogWarning("Disk %d of instance %s did not return valid"
                                   " spindles information, ignoring", idx,
                                   instance.name)
                 elif disk.spindles is None or disk.spindles != spindles:
                   self.LogInfo("Disk %d of instance %s has mismatched spindles,"
                                " correcting: recorded %s, actual %s",
                                idx, instance.name, disk.spindles, spindles)
                   disk.spindles = spindles
                   self.cfg.Update(instance, feedback_fn)
                   changed.append((instance.name, idx, "spindles", disk.spindles))
               if self._EnsureChildSizes(disk):
                 self.cfg.Update(instance, feedback_fn)
                 changed.append((instance.name, idx, "size", disk.size))
           return changed
       def _ValidateNetmask(cfg, netmask):
         """Checks if a netmask is valid.
         @type cfg: L{config.ConfigWriter}
         @param cfg: The cluster configuration
         @type netmask: int
         @param netmask: the netmask to be verified
         @raise errors.OpPrereqError: if the validation fails
         """
         ip_family = cfg.GetPrimaryIPFamily()
         try:
           ipcls = netutils.IPAddress.GetClassFromIpFamily(ip_family)
         except errors.ProgrammerError:
           raise errors.OpPrereqError("Invalid primary ip family: %s." %
                                      ip_family, errors.ECODE_INVAL)
         if not ipcls.ValidateNetmask(netmask):
           raise errors.OpPrereqError("CIDR netmask (%s) not valid" %
                                      (netmask), errors.ECODE_INVAL)
       class LUClusterSetParams(LogicalUnit):
         """Change the parameters of the cluster.
         """
         HPATH = "cluster-modify"
         HTYPE = constants.HTYPE_CLUSTER
         REQ_BGL = False
         def CheckArguments(self):
           """Check parameters
           """
           if self.op.uid_pool:
             uidpool.CheckUidPool(self.op.uid_pool)
           if self.op.add_uids:
             uidpool.CheckUidPool(self.op.add_uids)
           if self.op.remove_uids:
             uidpool.CheckUidPool(self.op.remove_uids)
           if self.op.master_netmask is not None:
             _ValidateNetmask(self.cfg, self.op.master_netmask)
           if self.op.diskparams:
             for dt_params in self.op.diskparams.values():
               utils.ForceDictType(dt_params, constants.DISK_DT_TYPES)
             try:
               utils.VerifyDictOptions(self.op.diskparams, constants.DISK_DT_DEFAULTS)
             except errors.OpPrereqError, err:
               raise errors.OpPrereqError("While verify diskparams options: %s" % err,
                                          errors.ECODE_INVAL)
         def ExpandNames(self):
           # FIXME: in the future maybe other cluster params won't require checking on
           # all nodes to be modified.
           # FIXME: This opcode changes cluster-wide settings. Is acquiring all
           # resource locks the right thing, shouldn't it be the BGL instead?
           self.needed_locks = {
             locking.LEVEL_NODE: locking.ALL_SET,
             locking.LEVEL_INSTANCE: locking.ALL_SET,
             locking.LEVEL_NODEGROUP: locking.ALL_SET,
             locking.LEVEL_NODE_ALLOC: locking.ALL_SET,
+          }
           self.share_locks = ShareAll()
         def BuildHooksEnv(self):
           """Build hooks env.
           """
           return {
             "OP_TARGET": self.cfg.GetClusterName(),
             "NEW_VG_NAME": self.op.vg_name,
+            }
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           mn = self.cfg.GetMasterNode()
           return ([mn], [mn])
         def _CheckVgName(self, node_list, enabled_disk_templates,
                          new_enabled_disk_templates):
           """Check the consistency of the vg name on all nodes and in case it gets
              unset whether there are instances still using it.
           """
           if self.op.vg_name is not None and not self.op.vg_name:
             if self.cfg.HasAnyDiskOfType(constants.LD_LV):
               raise errors.OpPrereqError("Cannot disable lvm storage while lvm-based"
                                          " instances exist", errors.ECODE_INVAL)
           if (self.op.vg_name is not None and
               utils.IsLvmEnabled(enabled_disk_templates)) or \
                  (self.cfg.GetVGName() is not None and
                   utils.LvmGetsEnabled(enabled_disk_templates,
                                        new_enabled_disk_templates)):
             self._CheckVgNameOnNodes(node_list)
         def _CheckVgNameOnNodes(self, node_list):
           """Check the status of the volume group on each node.
           """
           vglist = self.rpc.call_vg_list(node_list)
           for node in node_list:
             msg = vglist[node].fail_msg
             if msg:
               # ignoring down node
               self.LogWarning("Error while gathering data on node %s"
                               " (ignoring node): %s", node, msg)
               continue
             vgstatus = utils.CheckVolumeGroupSize(vglist[node].payload,
                                                   self.op.vg_name,
                                                   constants.MIN_VG_SIZE)
             if vgstatus:
               raise errors.OpPrereqError("Error on node '%s': %s" %
                                          (node, vgstatus), errors.ECODE_ENVIRON)
         def _GetEnabledDiskTemplates(self, cluster):
           """Determines the enabled disk templates and the subset of disk templates
              that are newly enabled by this operation.
           """
           enabled_disk_templates = None
           new_enabled_disk_templates = []
           if self.op.enabled_disk_templates:
             enabled_disk_templates = self.op.enabled_disk_templates
             new_enabled_disk_templates = \
               list(set(enabled_disk_templates)
                    - set(cluster.enabled_disk_templates))
           else:
             enabled_disk_templates = cluster.enabled_disk_templates
           return (enabled_disk_templates, new_enabled_disk_templates)
         def CheckPrereq(self):
           """Check prerequisites.
           This checks whether the given params don't conflict and
           if the given volume group is valid.
           """
           if self.op.drbd_helper is not None and not self.op.drbd_helper:
             if self.cfg.HasAnyDiskOfType(constants.LD_DRBD8):
               raise errors.OpPrereqError("Cannot disable drbd helper while"
                                          " drbd-based instances exist",
                                          errors.ECODE_INVAL)
           node_list = self.owned_locks(locking.LEVEL_NODE)
           self.cluster = cluster = self.cfg.GetClusterInfo()
           vm_capable_nodes = [node.name
                               for node in self.cfg.GetAllNodesInfo().values()
                               if node.name in node_list and node.vm_capable]
           (enabled_disk_templates, new_enabled_disk_templates) = \
             self._GetEnabledDiskTemplates(cluster)
           self._CheckVgName(vm_capable_nodes, enabled_disk_templates,
                             new_enabled_disk_templates)
           if self.op.drbd_helper:
             # checks given drbd helper on all nodes
             helpers = self.rpc.call_drbd_helper(node_list)
             for (node, ninfo) in self.cfg.GetMultiNodeInfo(node_list):
               if ninfo.offline:
                 self.LogInfo("Not checking drbd helper on offline node %s", node)
                 continue
               msg = helpers[node].fail_msg
               if msg:
                 raise errors.OpPrereqError("Error checking drbd helper on node"
                                            " '%s': %s" % (node, msg),
                                            errors.ECODE_ENVIRON)
               node_helper = helpers[node].payload
               if node_helper != self.op.drbd_helper:
                 raise errors.OpPrereqError("Error on node '%s': drbd helper is %s" %
                                            (node, node_helper), errors.ECODE_ENVIRON)
           # validate params changes
           if self.op.beparams:
             objects.UpgradeBeParams(self.op.beparams)
             utils.ForceDictType(self.op.beparams, constants.BES_PARAMETER_TYPES)
             self.new_beparams = cluster.SimpleFillBE(self.op.beparams)
           if self.op.ndparams:
             utils.ForceDictType(self.op.ndparams, constants.NDS_PARAMETER_TYPES)
             self.new_ndparams = cluster.SimpleFillND(self.op.ndparams)
             # TODO: we need a more general way to handle resetting
             # cluster-level parameters to default values
             if self.new_ndparams["oob_program"] == "":
               self.new_ndparams["oob_program"] = \
                   constants.NDC_DEFAULTS[constants.ND_OOB_PROGRAM]
           if self.op.hv_state:
             new_hv_state = MergeAndVerifyHvState(self.op.hv_state,
                                                  self.cluster.hv_state_static)
             self.new_hv_state = dict((hv, cluster.SimpleFillHvState(values))
                                      for hv, values in new_hv_state.items())
           if self.op.disk_state:
             new_disk_state = MergeAndVerifyDiskState(self.op.disk_state,
                                                      self.cluster.disk_state_static)
             self.new_disk_state = \
               dict((storage, dict((name, cluster.SimpleFillDiskState(values))
                                   for name, values in svalues.items()))
                    for storage, svalues in new_disk_state.items())
           if self.op.ipolicy:
             self.new_ipolicy = GetUpdatedIPolicy(cluster.ipolicy, self.op.ipolicy,
                                                  group_policy=False)
             all_instances = self.cfg.GetAllInstancesInfo().values()
             violations = set()
             for group in self.cfg.GetAllNodeGroupsInfo().values():
               instances = frozenset([inst for inst in all_instances
                                      if compat.any(node in group.members
                                                    for node in inst.all_nodes)])
               new_ipolicy = objects.FillIPolicy(self.new_ipolicy, group.ipolicy)
               ipol = masterd.instance.CalculateGroupIPolicy(cluster, group)
               new = ComputeNewInstanceViolations(ipol,
                                                  new_ipolicy, instances, self.cfg)
               if new:
                 violations.update(new)
             if violations:
               self.LogWarning("After the ipolicy change the following instances"
                               " violate them: %s",
                               utils.CommaJoin(utils.NiceSort(violations)))
           if self.op.nicparams:
             utils.ForceDictType(self.op.nicparams, constants.NICS_PARAMETER_TYPES)
             self.new_nicparams = cluster.SimpleFillNIC(self.op.nicparams)
             objects.NIC.CheckParameterSyntax(self.new_nicparams)
             nic_errors = []
             # check all instances for consistency
             for instance in self.cfg.GetAllInstancesInfo().values():
               for nic_idx, nic in enumerate(instance.nics):
                 params_copy = copy.deepcopy(nic.nicparams)
                 params_filled = objects.FillDict(self.new_nicparams, params_copy)
                 # check parameter syntax
                 try:
                   objects.NIC.CheckParameterSyntax(params_filled)
                 except errors.ConfigurationError, err:
                   nic_errors.append("Instance %s, nic/%d: %s" %
                                     (instance.name, nic_idx, err))
                 # if we're moving instances to routed, check that they have an ip
                 target_mode = params_filled[constants.NIC_MODE]
                 if target_mode == constants.NIC_MODE_ROUTED and not nic.ip:
                   nic_errors.append("Instance %s, nic/%d: routed NIC with no ip"
                                     " address" % (instance.name, nic_idx))
             if nic_errors:
               raise errors.OpPrereqError("Cannot apply the change, errors:\n%s" %
                                          "\n".join(nic_errors), errors.ECODE_INVAL)
           # hypervisor list/parameters
           self.new_hvparams = new_hvp = objects.FillDict(cluster.hvparams, {})
           if self.op.hvparams:
             for hv_name, hv_dict in self.op.hvparams.items():
               if hv_name not in self.new_hvparams:
                 self.new_hvparams[hv_name] = hv_dict
               else:
                 self.new_hvparams[hv_name].update(hv_dict)
           # disk template parameters
           self.new_diskparams = objects.FillDict(cluster.diskparams, {})
           if self.op.diskparams:
             for dt_name, dt_params in self.op.diskparams.items():
               if dt_name not in self.op.diskparams:
                 self.new_diskparams[dt_name] = dt_params
               else:
                 self.new_diskparams[dt_name].update(dt_params)
           # os hypervisor parameters
           self.new_os_hvp = objects.FillDict(cluster.os_hvp, {})
           if self.op.os_hvp:
             for os_name, hvs in self.op.os_hvp.items():
               if os_name not in self.new_os_hvp:
                 self.new_os_hvp[os_name] = hvs
               else:
                 for hv_name, hv_dict in hvs.items():
                   if hv_dict is None:
                     # Delete if it exists
                     self.new_os_hvp[os_name].pop(hv_name, None)
                   elif hv_name not in self.new_os_hvp[os_name]:
                     self.new_os_hvp[os_name][hv_name] = hv_dict
                   else:
                     self.new_os_hvp[os_name][hv_name].update(hv_dict)
           # os parameters
           self.new_osp = objects.FillDict(cluster.osparams, {})
           if self.op.osparams:
             for os_name, osp in self.op.osparams.items():
               if os_name not in self.new_osp:
                 self.new_osp[os_name] = {}
               self.new_osp[os_name] = GetUpdatedParams(self.new_osp[os_name], osp,
                                                        use_none=True)
               if not self.new_osp[os_name]:
                 # we removed all parameters
                 del self.new_osp[os_name]
               else:
                 # check the parameter validity (remote check)
                 CheckOSParams(self, False, [self.cfg.GetMasterNode()],
                               os_name, self.new_osp[os_name])
           # changes to the hypervisor list
           if self.op.enabled_hypervisors is not None:
             self.hv_list = self.op.enabled_hypervisors
             for hv in self.hv_list:
               # if the hypervisor doesn't already exist in the cluster
               # hvparams, we initialize it to empty, and then (in both
               # cases) we make sure to fill the defaults, as we might not
               # have a complete defaults list if the hypervisor wasn't
               # enabled before
               if hv not in new_hvp:
                 new_hvp[hv] = {}
               new_hvp[hv] = objects.FillDict(constants.HVC_DEFAULTS[hv], new_hvp[hv])
               utils.ForceDictType(new_hvp[hv], constants.HVS_PARAMETER_TYPES)
           else:
             self.hv_list = cluster.enabled_hypervisors
           if self.op.hvparams or self.op.enabled_hypervisors is not None:
             # either the enabled list has changed, or the parameters have, validate
             for hv_name, hv_params in self.new_hvparams.items():
               if ((self.op.hvparams and hv_name in self.op.hvparams) or
                   (self.op.enabled_hypervisors and
                    hv_name in self.op.enabled_hypervisors)):
                 # either this is a new hypervisor, or its parameters have changed
                 hv_class = hypervisor.GetHypervisorClass(hv_name)
                 utils.ForceDictType(hv_params, constants.HVS_PARAMETER_TYPES)
                 hv_class.CheckParameterSyntax(hv_params)
                 CheckHVParams(self, node_list, hv_name, hv_params)
           self._CheckDiskTemplateConsistency()
           if self.op.os_hvp:
             # no need to check any newly-enabled hypervisors, since the
             # defaults have already been checked in the above code-block
             for os_name, os_hvp in self.new_os_hvp.items():
               for hv_name, hv_params in os_hvp.items():
                 utils.ForceDictType(hv_params, constants.HVS_PARAMETER_TYPES)
                 # we need to fill in the new os_hvp on top of the actual hv_p
                 cluster_defaults = self.new_hvparams.get(hv_name, {})
                 new_osp = objects.FillDict(cluster_defaults, hv_params)
                 hv_class = hypervisor.GetHypervisorClass(hv_name)
                 hv_class.CheckParameterSyntax(new_osp)
                 CheckHVParams(self, node_list, hv_name, new_osp)
           if self.op.default_iallocator:
             alloc_script = utils.FindFile(self.op.default_iallocator,
                                           constants.IALLOCATOR_SEARCH_PATH,
                                           os.path.isfile)
             if alloc_script is None:
               raise errors.OpPrereqError("Invalid default iallocator script '%s'"
                                          " specified" % self.op.default_iallocator,
                                          errors.ECODE_INVAL)
         def _CheckDiskTemplateConsistency(self):
           """Check whether the disk templates that are going to be disabled
              are still in use by some instances.
           """
           if self.op.enabled_disk_templates:
             cluster = self.cfg.GetClusterInfo()
             instances = self.cfg.GetAllInstancesInfo()
             disk_templates_to_remove = set(cluster.enabled_disk_templates) \
               - set(self.op.enabled_disk_templates)
             for instance in instances.itervalues():
               if instance.disk_template in disk_templates_to_remove:
                 raise errors.OpPrereqError("Cannot disable disk template '%s',"
                                            " because instance '%s' is using it." %
                                            (instance.disk_template, instance.name))
         def _SetVgName(self, feedback_fn):
           """Determines and sets the new volume group name.
           """
           if self.op.vg_name is not None:
             if self.op.vg_name and not \
                  utils.IsLvmEnabled(self.cluster.enabled_disk_templates):
               feedback_fn("Note that you specified a volume group, but did not"
                           " enable any lvm disk template.")
             new_volume = self.op.vg_name
             if not new_volume:
               if utils.IsLvmEnabled(self.cluster.enabled_disk_templates):
                 raise errors.OpPrereqError("Cannot unset volume group if lvm-based"
                                            " disk templates are enabled.")
               new_volume = None
             if new_volume != self.cfg.GetVGName():
               self.cfg.SetVGName(new_volume)
             else:
               feedback_fn("Cluster LVM configuration already in desired"
                           " state, not changing")
           else:
             if utils.IsLvmEnabled(self.cluster.enabled_disk_templates) and \
                 not self.cfg.GetVGName():
               raise errors.OpPrereqError("Please specify a volume group when"
                                          " enabling lvm-based disk-templates.")
         def Exec(self, feedback_fn):
           """Change the parameters of the cluster.
           """
           if self.op.enabled_disk_templates:
             self.cluster.enabled_disk_templates = \
               list(set(self.op.enabled_disk_templates))
           self._SetVgName(feedback_fn)
           if self.op.drbd_helper is not None:
             if not constants.DT_DRBD8 in self.cluster.enabled_disk_templates:
               feedback_fn("Note that you specified a drbd user helper, but did"
                           " enabled the drbd disk template.")
             new_helper = self.op.drbd_helper
             if not new_helper:
               new_helper = None
             if new_helper != self.cfg.GetDRBDHelper():
               self.cfg.SetDRBDHelper(new_helper)
             else:
               feedback_fn("Cluster DRBD helper already in desired state,"
                           " not changing")
           if self.op.hvparams:
             self.cluster.hvparams = self.new_hvparams
           if self.op.os_hvp:
             self.cluster.os_hvp = self.new_os_hvp
           if self.op.enabled_hypervisors is not None:
             self.cluster.hvparams = self.new_hvparams
             self.cluster.enabled_hypervisors = self.op.enabled_hypervisors
           if self.op.beparams:
             self.cluster.beparams[constants.PP_DEFAULT] = self.new_beparams
           if self.op.nicparams:
             self.cluster.nicparams[constants.PP_DEFAULT] = self.new_nicparams
           if self.op.ipolicy:
             self.cluster.ipolicy = self.new_ipolicy
           if self.op.osparams:
             self.cluster.osparams = self.new_osp
           if self.op.ndparams:
             self.cluster.ndparams = self.new_ndparams
           if self.op.diskparams:
             self.cluster.diskparams = self.new_diskparams
           if self.op.hv_state:
             self.cluster.hv_state_static = self.new_hv_state
           if self.op.disk_state:
             self.cluster.disk_state_static = self.new_disk_state
           if self.op.candidate_pool_size is not None:
             self.cluster.candidate_pool_size = self.op.candidate_pool_size
             # we need to update the pool size here, otherwise the save will fail
             AdjustCandidatePool(self, [])
           if self.op.maintain_node_health is not None:
             if self.op.maintain_node_health and not constants.ENABLE_CONFD:
               feedback_fn("Note: CONFD was disabled at build time, node health"
                           " maintenance is not useful (still enabling it)")
             self.cluster.maintain_node_health = self.op.maintain_node_health
           if self.op.prealloc_wipe_disks is not None:
             self.cluster.prealloc_wipe_disks = self.op.prealloc_wipe_disks
           if self.op.add_uids is not None:
             uidpool.AddToUidPool(self.cluster.uid_pool, self.op.add_uids)
           if self.op.remove_uids is not None:
             uidpool.RemoveFromUidPool(self.cluster.uid_pool, self.op.remove_uids)
           if self.op.uid_pool is not None:
             self.cluster.uid_pool = self.op.uid_pool
           if self.op.default_iallocator is not None:
             self.cluster.default_iallocator = self.op.default_iallocator
           if self.op.reserved_lvs is not None:
             self.cluster.reserved_lvs = self.op.reserved_lvs
           if self.op.use_external_mip_script is not None:
             self.cluster.use_external_mip_script = self.op.use_external_mip_script
           def helper_os(aname, mods, desc):
             desc += " OS list"
             lst = getattr(self.cluster, aname)
             for key, val in mods:
               if key == constants.DDM_ADD:
                 if val in lst:
                   feedback_fn("OS %s already in %s, ignoring" % (val, desc))
                 else:
                   lst.append(val)
               elif key == constants.DDM_REMOVE:
                 if val in lst:
                   lst.remove(val)
                 else:
                   feedback_fn("OS %s not found in %s, ignoring" % (val, desc))
               else:
                 raise errors.ProgrammerError("Invalid modification '%s'" % key)
           if self.op.hidden_os:
             helper_os("hidden_os", self.op.hidden_os, "hidden")
           if self.op.blacklisted_os:
             helper_os("blacklisted_os", self.op.blacklisted_os, "blacklisted")
           if self.op.master_netdev:
             master_params = self.cfg.GetMasterNetworkParameters()
             ems = self.cfg.GetUseExternalMipScript()
             feedback_fn("Shutting down master ip on the current netdev (%s)" %
                         self.cluster.master_netdev)
             result = self.rpc.call_node_deactivate_master_ip(master_params.name,
                                                              master_params, ems)
             result.Raise("Could not disable the master ip")
             feedback_fn("Changing master_netdev from %s to %s" %
                         (master_params.netdev, self.op.master_netdev))
             self.cluster.master_netdev = self.op.master_netdev
           if self.op.master_netmask:
             master_params = self.cfg.GetMasterNetworkParameters()
             feedback_fn("Changing master IP netmask to %s" % self.op.master_netmask)
             result = self.rpc.call_node_change_master_netmask(master_params.name,
                                                               master_params.netmask,
                                                               self.op.master_netmask,
                                                               master_params.ip,
                                                               master_params.netdev)
             result.Warn("Could not change the master IP netmask", feedback_fn)
             self.cluster.master_netmask = self.op.master_netmask
           self.cfg.Update(self.cluster, feedback_fn)
           if self.op.master_netdev:
             master_params = self.cfg.GetMasterNetworkParameters()
             feedback_fn("Starting the master ip on the new master netdev (%s)" %
                         self.op.master_netdev)
             ems = self.cfg.GetUseExternalMipScript()
             result = self.rpc.call_node_activate_master_ip(master_params.name,
                                                            master_params, ems)
             result.Warn("Could not re-enable the master ip on the master,"
                         " please restart manually", self.LogWarning)
       class LUClusterVerify(NoHooksLU):
         """Submits all jobs necessary to verify the cluster.
         """
         REQ_BGL = False
         def ExpandNames(self):
           self.needed_locks = {}
         def Exec(self, feedback_fn):
           jobs = []
           if self.op.group_name:
             groups = [self.op.group_name]
             depends_fn = lambda: None
           else:
             groups = self.cfg.GetNodeGroupList()
             # Verify global configuration
             jobs.append([
               opcodes.OpClusterVerifyConfig(ignore_errors=self.op.ignore_errors),
               ])
             # Always depend on global verification
             depends_fn = lambda: [(-len(jobs), [])]
           jobs.extend(
             [opcodes.OpClusterVerifyGroup(group_name=group,
                                           ignore_errors=self.op.ignore_errors,
                                           depends=depends_fn())]
             for group in groups)
           # Fix up all parameters
           for op in itertools.chain(*jobs): # pylint: disable=W0142
             op.debug_simulate_errors = self.op.debug_simulate_errors
             op.verbose = self.op.verbose
             op.error_codes = self.op.error_codes
             try:
               op.skip_checks = self.op.skip_checks
             except AttributeError:
               assert not isinstance(op, opcodes.OpClusterVerifyGroup)
           return ResultWithJobs(jobs)
       class _VerifyErrors(object):
         """Mix-in for cluster/group verify LUs.
         It provides _Error and _ErrorIf, and updates the self.bad boolean. (Expects
         self.op and self._feedback_fn to be available.)
         """
         ETYPE_FIELD = "code"
         ETYPE_ERROR = "ERROR"
         ETYPE_WARNING = "WARNING"
         def _Error(self, ecode, item, msg, *args, **kwargs):
           """Format an error message.
           Based on the opcode's error_codes parameter, either format a
           parseable error code, or a simpler error string.
           This must be called only from Exec and functions called from Exec.
           """
           ltype = kwargs.get(self.ETYPE_FIELD, self.ETYPE_ERROR)
           itype, etxt, _ = ecode
           # If the error code is in the list of ignored errors, demote the error to a
           # warning
           if etxt in self.op.ignore_errors:     # pylint: disable=E1101
             ltype = self.ETYPE_WARNING
           # first complete the msg
           if args:
             msg = msg % args
           # then format the whole message
           if self.op.error_codes: # This is a mix-in. pylint: disable=E1101
             msg = "%s:%s:%s:%s:%s" % (ltype, etxt, itype, item, msg)
           else:
             if item:
               item = " " + item
             else:
               item = ""
             msg = "%s: %s%s: %s" % (ltype, itype, item, msg)
           # and finally report it via the feedback_fn
           self._feedback_fn("  - %s" % msg) # Mix-in. pylint: disable=E1101
           # do not mark the operation as failed for WARN cases only
           if ltype == self.ETYPE_ERROR:
             self.bad = True
         def _ErrorIf(self, cond, *args, **kwargs):
           """Log an error message if the passed condition is True.
           """
           if (bool(cond)
               or self.op.debug_simulate_errors): # pylint: disable=E1101
             self._Error(*args, **kwargs)
       def _VerifyCertificate(filename):
         """Verifies a certificate for L{LUClusterVerifyConfig}.
         @type filename: string
         @param filename: Path to PEM file
         """
         try:
           cert = OpenSSL.crypto.load_certificate(OpenSSL.crypto.FILETYPE_PEM,
                                                  utils.ReadFile(filename))
         except Exception, err: # pylint: disable=W0703
           return (LUClusterVerifyConfig.ETYPE_ERROR,
                   "Failed to load X509 certificate %s: %s" % (filename, err))
         (errcode, msg) = \
           utils.VerifyX509Certificate(cert, constants.SSL_CERT_EXPIRATION_WARN,
                                       constants.SSL_CERT_EXPIRATION_ERROR)
         if msg:
           fnamemsg = "While verifying %s: %s" % (filename, msg)
         else:
           fnamemsg = None
         if errcode is None:
           return (None, fnamemsg)
         elif errcode == utils.CERT_WARNING:
           return (LUClusterVerifyConfig.ETYPE_WARNING, fnamemsg)
         elif errcode == utils.CERT_ERROR:
           return (LUClusterVerifyConfig.ETYPE_ERROR, fnamemsg)
         raise errors.ProgrammerError("Unhandled certificate error code %r" % errcode)
       def _GetAllHypervisorParameters(cluster, instances):
         """Compute the set of all hypervisor parameters.
         @type cluster: L{objects.Cluster}
         @param cluster: the cluster object
         @param instances: list of L{objects.Instance}
         @param instances: additional instances from which to obtain parameters
         @rtype: list of (origin, hypervisor, parameters)
         @return: a list with all parameters found, indicating the hypervisor they
              apply to, and the origin (can be "cluster", "os X", or "instance Y")
         """
         hvp_data = []
         for hv_name in cluster.enabled_hypervisors:
           hvp_data.append(("cluster", hv_name, cluster.GetHVDefaults(hv_name)))
         for os_name, os_hvp in cluster.os_hvp.items():
           for hv_name, hv_params in os_hvp.items():
             if hv_params:
               full_params = cluster.GetHVDefaults(hv_name, os_name=os_name)
               hvp_data.append(("os %s" % os_name, hv_name, full_params))
         # TODO: collapse identical parameter values in a single one
         for instance in instances:
           if instance.hvparams:
             hvp_data.append(("instance %s" % instance.name, instance.hypervisor,
                              cluster.FillHV(instance)))
         return hvp_data
       class LUClusterVerifyConfig(NoHooksLU, _VerifyErrors):
         """Verifies the cluster config.
         """
         REQ_BGL = False
         def _VerifyHVP(self, hvp_data):
           """Verifies locally the syntax of the hypervisor parameters.
           """
           for item, hv_name, hv_params in hvp_data:
             msg = ("hypervisor %s parameters syntax check (source %s): %%s" %
                    (item, hv_name))
             try:
               hv_class = hypervisor.GetHypervisorClass(hv_name)
               utils.ForceDictType(hv_params, constants.HVS_PARAMETER_TYPES)
               hv_class.CheckParameterSyntax(hv_params)
             except errors.GenericError, err:
               self._ErrorIf(True, constants.CV_ECLUSTERCFG, None, msg % str(err))
         def ExpandNames(self):
           self.needed_locks = dict.fromkeys(locking.LEVELS, locking.ALL_SET)
           self.share_locks = ShareAll()
         def CheckPrereq(self):
           """Check prerequisites.
           """
           # Retrieve all information
           self.all_group_info = self.cfg.GetAllNodeGroupsInfo()
           self.all_node_info = self.cfg.GetAllNodesInfo()
           self.all_inst_info = self.cfg.GetAllInstancesInfo()
         def Exec(self, feedback_fn):
           """Verify integrity of cluster, performing various test on nodes.
           """
           self.bad = False
           self._feedback_fn = feedback_fn
           feedback_fn("* Verifying cluster config")
           for msg in self.cfg.VerifyConfig():
             self._ErrorIf(True, constants.CV_ECLUSTERCFG, None, msg)
           feedback_fn("* Verifying cluster certificate files")
           for cert_filename in pathutils.ALL_CERT_FILES:
             (errcode, msg) = _VerifyCertificate(cert_filename)
             self._ErrorIf(errcode, constants.CV_ECLUSTERCERT, None, msg, code=errcode)
           feedback_fn("* Verifying hypervisor parameters")
           self._VerifyHVP(_GetAllHypervisorParameters(self.cfg.GetClusterInfo(),
                                                       self.all_inst_info.values()))
           feedback_fn("* Verifying all nodes belong to an existing group")
           # We do this verification here because, should this bogus circumstance
           # occur, it would never be caught by VerifyGroup, which only acts on
           # nodes/instances reachable from existing node groups.
           dangling_nodes = set(node.name for node in self.all_node_info.values()
                                if node.group not in self.all_group_info)
           dangling_instances = {}
           no_node_instances = []
           for inst in self.all_inst_info.values():
             if inst.primary_node in dangling_nodes:
               dangling_instances.setdefault(inst.primary_node, []).append(inst.name)
             elif inst.primary_node not in self.all_node_info:
               no_node_instances.append(inst.name)
           pretty_dangling = [
               "%s (%s)" %
               (node.name,
                utils.CommaJoin(dangling_instances.get(node.name,
                                                       ["no instances"])))
               for node in dangling_nodes]
           self._ErrorIf(bool(dangling_nodes), constants.CV_ECLUSTERDANGLINGNODES,
                         None,
                         "the following nodes (and their instances) belong to a non"
                         " existing group: %s", utils.CommaJoin(pretty_dangling))
           self._ErrorIf(bool(no_node_instances), constants.CV_ECLUSTERDANGLINGINST,
                         None,
                         "the following instances have a non-existing primary-node:"
                         " %s", utils.CommaJoin(no_node_instances))
           return not self.bad
       class LUClusterVerifyGroup(LogicalUnit, _VerifyErrors):
         """Verifies the status of a node group.
         """
         HPATH = "cluster-verify"
         HTYPE = constants.HTYPE_CLUSTER
         REQ_BGL = False
         _HOOKS_INDENT_RE = re.compile("^", re.M)
         class NodeImage(object):
           """A class representing the logical and physical status of a node.
           @type name: string
           @ivar name: the node name to which this object refers
           @ivar volumes: a structure as returned from
               L{ganeti.backend.GetVolumeList} (runtime)
           @ivar instances: a list of running instances (runtime)
           @ivar pinst: list of configured primary instances (config)
           @ivar sinst: list of configured secondary instances (config)
           @ivar sbp: dictionary of {primary-node: list of instances} for all
               instances for which this node is secondary (config)
           @ivar mfree: free memory, as reported by hypervisor (runtime)
           @ivar dfree: free disk, as reported by the node (runtime)
           @ivar offline: the offline status (config)
           @type rpc_fail: boolean
           @ivar rpc_fail: whether the RPC verify call was successfull (overall,
               not whether the individual keys were correct) (runtime)
           @type lvm_fail: boolean
           @ivar lvm_fail: whether the RPC call didn't return valid LVM data
           @type hyp_fail: boolean
           @ivar hyp_fail: whether the RPC call didn't return the instance list
           @type ghost: boolean
           @ivar ghost: whether this is a known node or not (config)
           @type os_fail: boolean
           @ivar os_fail: whether the RPC call didn't return valid OS data
           @type oslist: list
           @ivar oslist: list of OSes as diagnosed by DiagnoseOS
           @type vm_capable: boolean
           @ivar vm_capable: whether the node can host instances
           @type pv_min: float
           @ivar pv_min: size in MiB of the smallest PVs
           @type pv_max: float
           @ivar pv_max: size in MiB of the biggest PVs
           """
           def __init__(self, offline=False, name=None, vm_capable=True):
             self.name = name
             self.volumes = {}
             self.instances = []
             self.pinst = []
             self.sinst = []
             self.sbp = {}
             self.mfree = 0
             self.dfree = 0
             self.offline = offline
             self.vm_capable = vm_capable
             self.rpc_fail = False
             self.lvm_fail = False
             self.hyp_fail = False
             self.ghost = False
             self.os_fail = False
             self.oslist = {}
             self.pv_min = None
             self.pv_max = None
         def ExpandNames(self):
           # This raises errors.OpPrereqError on its own:
           self.group_uuid = self.cfg.LookupNodeGroup(self.op.group_name)
           # Get instances in node group; this is unsafe and needs verification later
           inst_names = \
             self.cfg.GetNodeGroupInstances(self.group_uuid, primary_only=True)
           self.needed_locks = {
             locking.LEVEL_INSTANCE: inst_names,
             locking.LEVEL_NODEGROUP: [self.group_uuid],
             locking.LEVEL_NODE: [],
             # This opcode is run by watcher every five minutes and acquires all nodes
             # for a group. It doesn't run for a long time, so it's better to acquire
             # the node allocation lock as well.
             locking.LEVEL_NODE_ALLOC: locking.ALL_SET,
+            }
           self.share_locks = ShareAll()
         def DeclareLocks(self, level):
           if level == locking.LEVEL_NODE:
             # Get members of node group; this is unsafe and needs verification later
             nodes = set(self.cfg.GetNodeGroup(self.group_uuid).members)
             all_inst_info = self.cfg.GetAllInstancesInfo()
             # In Exec(), we warn about mirrored instances that have primary and
             # secondary living in separate node groups. To fully verify that
             # volumes for these instances are healthy, we will need to do an
             # extra call to their secondaries. We ensure here those nodes will
             # be locked.
             for inst in self.owned_locks(locking.LEVEL_INSTANCE):
               # Important: access only the instances whose lock is owned
               if all_inst_info[inst].disk_template in constants.DTS_INT_MIRROR:
                 nodes.update(all_inst_info[inst].secondary_nodes)
             self.needed_locks[locking.LEVEL_NODE] = nodes
         def CheckPrereq(self):
           assert self.group_uuid in self.owned_locks(locking.LEVEL_NODEGROUP)
           self.group_info = self.cfg.GetNodeGroup(self.group_uuid)
           group_nodes = set(self.group_info.members)
           group_instances = \
             self.cfg.GetNodeGroupInstances(self.group_uuid, primary_only=True)
           unlocked_nodes = \
               group_nodes.difference(self.owned_locks(locking.LEVEL_NODE))
           unlocked_instances = \
               group_instances.difference(self.owned_locks(locking.LEVEL_INSTANCE))
           if unlocked_nodes:
             raise errors.OpPrereqError("Missing lock for nodes: %s" %
                                        utils.CommaJoin(unlocked_nodes),
                                        errors.ECODE_STATE)
           if unlocked_instances:
             raise errors.OpPrereqError("Missing lock for instances: %s" %
                                        utils.CommaJoin(unlocked_instances),
                                        errors.ECODE_STATE)
           self.all_node_info = self.cfg.GetAllNodesInfo()
           self.all_inst_info = self.cfg.GetAllInstancesInfo()
           self.my_node_names = utils.NiceSort(group_nodes)
           self.my_inst_names = utils.NiceSort(group_instances)
           self.my_node_info = dict((name, self.all_node_info[name])
                                    for name in self.my_node_names)
           self.my_inst_info = dict((name, self.all_inst_info[name])
                                    for name in self.my_inst_names)
           # We detect here the nodes that will need the extra RPC calls for verifying
           # split LV volumes; they should be locked.
           extra_lv_nodes = set()
           for inst in self.my_inst_info.values():
             if inst.disk_template in constants.DTS_INT_MIRROR:
               for nname in inst.all_nodes:
                 if self.all_node_info[nname].group != self.group_uuid:
                   extra_lv_nodes.add(nname)
           unlocked_lv_nodes = \
               extra_lv_nodes.difference(self.owned_locks(locking.LEVEL_NODE))
           if unlocked_lv_nodes:
             raise errors.OpPrereqError("Missing node locks for LV check: %s" %
                                        utils.CommaJoin(unlocked_lv_nodes),
                                        errors.ECODE_STATE)
           self.extra_lv_nodes = list(extra_lv_nodes)
         def _VerifyNode(self, ninfo, nresult):
           """Perform some basic validation on data returned from a node.
             - check the result data structure is well formed and has all the
               mandatory fields
             - check ganeti version
           @type ninfo: L{objects.Node}
           @param ninfo: the node to check
           @param nresult: the results from the node
           @rtype: boolean
           @return: whether overall this call was successful (and we can expect
                reasonable values in the respose)
           """
           node = ninfo.name
           _ErrorIf = self._ErrorIf # pylint: disable=C0103
           # main result, nresult should be a non-empty dict
           test = not nresult or not isinstance(nresult, dict)
           _ErrorIf(test, constants.CV_ENODERPC, node,
                         "unable to verify node: no data returned")
           if test:
             return False
           # compares ganeti version
           local_version = constants.PROTOCOL_VERSION
           remote_version = nresult.get("version", None)
           test = not (remote_version and
                       isinstance(remote_version, (list, tuple)) and
                       len(remote_version) == 2)
           _ErrorIf(test, constants.CV_ENODERPC, node,
                    "connection to node returned invalid data")
           if test:
             return False
           test = local_version != remote_version[0]
           _ErrorIf(test, constants.CV_ENODEVERSION, node,
                    "incompatible protocol versions: master %s,"
                    " node %s", local_version, remote_version[0])
           if test:
             return False
           # node seems compatible, we can actually try to look into its results
           # full package version
           self._ErrorIf(constants.RELEASE_VERSION != remote_version[1],
                         constants.CV_ENODEVERSION, node,
                         "software version mismatch: master %s, node %s",
                         constants.RELEASE_VERSION, remote_version[1],
                         code=self.ETYPE_WARNING)
           hyp_result = nresult.get(constants.NV_HYPERVISOR, None)
           if ninfo.vm_capable and isinstance(hyp_result, dict):
             for hv_name, hv_result in hyp_result.iteritems():
               test = hv_result is not None
               _ErrorIf(test, constants.CV_ENODEHV, node,
                        "hypervisor %s verify failure: '%s'", hv_name, hv_result)
           hvp_result = nresult.get(constants.NV_HVPARAMS, None)
           if ninfo.vm_capable and isinstance(hvp_result, list):
             for item, hv_name, hv_result in hvp_result:
               _ErrorIf(True, constants.CV_ENODEHV, node,
                        "hypervisor %s parameter verify failure (source %s): %s",
                        hv_name, item, hv_result)
           test = nresult.get(constants.NV_NODESETUP,
                              ["Missing NODESETUP results"])
           _ErrorIf(test, constants.CV_ENODESETUP, node, "node setup error: %s",
                    "; ".join(test))
           return True
         def _VerifyNodeTime(self, ninfo, nresult,
                             nvinfo_starttime, nvinfo_endtime):
           """Check the node time.
           @type ninfo: L{objects.Node}
           @param ninfo: the node to check
           @param nresult: the remote results for the node
           @param nvinfo_starttime: the start time of the RPC call
           @param nvinfo_endtime: the end time of the RPC call
           """
           node = ninfo.name
           _ErrorIf = self._ErrorIf # pylint: disable=C0103
           ntime = nresult.get(constants.NV_TIME, None)
           try:
             ntime_merged = utils.MergeTime(ntime)
           except (ValueError, TypeError):
             _ErrorIf(True, constants.CV_ENODETIME, node, "Node returned invalid time")
             return
           if ntime_merged < (nvinfo_starttime - constants.NODE_MAX_CLOCK_SKEW):
             ntime_diff = "%.01fs" % abs(nvinfo_starttime - ntime_merged)
           elif ntime_merged > (nvinfo_endtime + constants.NODE_MAX_CLOCK_SKEW):
             ntime_diff = "%.01fs" % abs(ntime_merged - nvinfo_endtime)
           else:
             ntime_diff = None
           _ErrorIf(ntime_diff is not None, constants.CV_ENODETIME, node,
                    "Node time diverges by at least %s from master node time",
                    ntime_diff)
         def _UpdateVerifyNodeLVM(self, ninfo, nresult, vg_name, nimg):
           """Check the node LVM results and update info for cross-node checks.
           @type ninfo: L{objects.Node}
           @param ninfo: the node to check
           @param nresult: the remote results for the node
           @param vg_name: the configured VG name
           @type nimg: L{NodeImage}
           @param nimg: node image
           """
           if vg_name is None:
             return
           node = ninfo.name
           _ErrorIf = self._ErrorIf # pylint: disable=C0103
           # checks vg existence and size > 20G
           vglist = nresult.get(constants.NV_VGLIST, None)
           test = not vglist
           _ErrorIf(test, constants.CV_ENODELVM, node, "unable to check volume groups")
           if not test:
             vgstatus = utils.CheckVolumeGroupSize(vglist, vg_name,
                                                   constants.MIN_VG_SIZE)
             _ErrorIf(vgstatus, constants.CV_ENODELVM, node, vgstatus)
           # Check PVs
           (errmsgs, pvminmax) = CheckNodePVs(nresult, self._exclusive_storage)
           for em in errmsgs:
             self._Error(constants.CV_ENODELVM, node, em)
           if pvminmax is not None:
             (nimg.pv_min, nimg.pv_max) = pvminmax
         def _VerifyGroupDRBDVersion(self, node_verify_infos):
           """Check cross-node DRBD version consistency.
           @type node_verify_infos: dict
           @param node_verify_infos: infos about nodes as returned from the
             node_verify call.
           """
           node_versions = {}
           for node, ndata in node_verify_infos.items():
             nresult = ndata.payload
             version = nresult.get(constants.NV_DRBDVERSION, "Missing DRBD version")
             node_versions[node] = version
           if len(set(node_versions.values())) > 1:
             for node, version in sorted(node_versions.items()):
               msg = "DRBD version mismatch: %s" % version
               self._Error(constants.CV_ENODEDRBDHELPER, node, msg,
                           code=self.ETYPE_WARNING)
         def _VerifyGroupLVM(self, node_image, vg_name):
           """Check cross-node consistency in LVM.
           @type node_image: dict
           @param node_image: info about nodes, mapping from node to names to
             L{NodeImage} objects
           @param vg_name: the configured VG name
           """
           if vg_name is None:
             return
           # Only exlcusive storage needs this kind of checks
           if not self._exclusive_storage:
             return
           # exclusive_storage wants all PVs to have the same size (approximately),
           # if the smallest and the biggest ones are okay, everything is fine.
           # pv_min is None iff pv_max is None
           vals = filter((lambda ni: ni.pv_min is not None), node_image.values())
           if not vals:
             return
           (pvmin, minnode) = min((ni.pv_min, ni.name) for ni in vals)
           (pvmax, maxnode) = max((ni.pv_max, ni.name) for ni in vals)
           bad = utils.LvmExclusiveTestBadPvSizes(pvmin, pvmax)
           self._ErrorIf(bad, constants.CV_EGROUPDIFFERENTPVSIZE, self.group_info.name,
                         "PV sizes differ too much in the group; smallest (%s MB) is"
                         " on %s, biggest (%s MB) is on %s",
                         pvmin, minnode, pvmax, maxnode)
         def _VerifyNodeBridges(self, ninfo, nresult, bridges):
           """Check the node bridges.
           @type ninfo: L{objects.Node}
           @param ninfo: the node to check
           @param nresult: the remote results for the node
           @param bridges: the expected list of bridges
           """
           if not bridges:
             return
           node = ninfo.name
           _ErrorIf = self._ErrorIf # pylint: disable=C0103
           missing = nresult.get(constants.NV_BRIDGES, None)
           test = not isinstance(missing, list)
           _ErrorIf(test, constants.CV_ENODENET, node,
                    "did not return valid bridge information")
           if not test:
             _ErrorIf(bool(missing), constants.CV_ENODENET, node,
                      "missing bridges: %s" % utils.CommaJoin(sorted(missing)))
         def _VerifyNodeUserScripts(self, ninfo, nresult):
           """Check the results of user scripts presence and executability on the node
           @type ninfo: L{objects.Node}
           @param ninfo: the node to check
           @param nresult: the remote results for the node
           """
           node = ninfo.name
           test = not constants.NV_USERSCRIPTS in nresult
           self._ErrorIf(test, constants.CV_ENODEUSERSCRIPTS, node,
                         "did not return user scripts information")
           broken_scripts = nresult.get(constants.NV_USERSCRIPTS, None)
           if not test:
             self._ErrorIf(broken_scripts, constants.CV_ENODEUSERSCRIPTS, node,
                           "user scripts not present or not executable: %s" %
                           utils.CommaJoin(sorted(broken_scripts)))
         def _VerifyNodeNetwork(self, ninfo, nresult):
           """Check the node network connectivity results.
           @type ninfo: L{objects.Node}
           @param ninfo: the node to check
           @param nresult: the remote results for the node
           """
           node = ninfo.name
           _ErrorIf = self._ErrorIf # pylint: disable=C0103
           test = constants.NV_NODELIST not in nresult
           _ErrorIf(test, constants.CV_ENODESSH, node,
                    "node hasn't returned node ssh connectivity data")
           if not test:
             if nresult[constants.NV_NODELIST]:
               for a_node, a_msg in nresult[constants.NV_NODELIST].items():
                 _ErrorIf(True, constants.CV_ENODESSH, node,
                          "ssh communication with node '%s': %s", a_node, a_msg)
           test = constants.NV_NODENETTEST not in nresult
           _ErrorIf(test, constants.CV_ENODENET, node,
                    "node hasn't returned node tcp connectivity data")
           if not test:
             if nresult[constants.NV_NODENETTEST]:
               nlist = utils.NiceSort(nresult[constants.NV_NODENETTEST].keys())
               for anode in nlist:
                 _ErrorIf(True, constants.CV_ENODENET, node,
                          "tcp communication with node '%s': %s",
                          anode, nresult[constants.NV_NODENETTEST][anode])
           test = constants.NV_MASTERIP not in nresult
           _ErrorIf(test, constants.CV_ENODENET, node,
                    "node hasn't returned node master IP reachability data")
           if not test:
             if not nresult[constants.NV_MASTERIP]:
               if node == self.master_node:
                 msg = "the master node cannot reach the master IP (not configured?)"
               else:
                 msg = "cannot reach the master IP"
               _ErrorIf(True, constants.CV_ENODENET, node, msg)
         def _VerifyInstance(self, instance, inst_config, node_image,
                             diskstatus):
           """Verify an instance.
           This function checks to see if the required block devices are
           available on the instance's node, and that the nodes are in the correct
           state.
           """
           _ErrorIf = self._ErrorIf # pylint: disable=C0103
           pnode = inst_config.primary_node
           pnode_img = node_image[pnode]
           groupinfo = self.cfg.GetAllNodeGroupsInfo()
           node_vol_should = {}
           inst_config.MapLVsByNode(node_vol_should)
           cluster = self.cfg.GetClusterInfo()
           ipolicy = ganeti.masterd.instance.CalculateGroupIPolicy(cluster,
                                                                   self.group_info)
           err = ComputeIPolicyInstanceViolation(ipolicy, inst_config, self.cfg)
           _ErrorIf(err, constants.CV_EINSTANCEPOLICY, instance, utils.CommaJoin(err),
                    code=self.ETYPE_WARNING)
           for node in node_vol_should:
             n_img = node_image[node]
             if n_img.offline or n_img.rpc_fail or n_img.lvm_fail:
               # ignore missing volumes on offline or broken nodes
               continue
             for volume in node_vol_should[node]:
               test = volume not in n_img.volumes
               _ErrorIf(test, constants.CV_EINSTANCEMISSINGDISK, instance,
                        "volume %s missing on node %s", volume, node)
           if inst_config.admin_state == constants.ADMINST_UP:
             test = instance not in pnode_img.instances and not pnode_img.offline
             _ErrorIf(test, constants.CV_EINSTANCEDOWN, instance,
                      "instance not running on its primary node %s",
                      pnode)
             _ErrorIf(pnode_img.offline, constants.CV_EINSTANCEBADNODE, instance,
                      "instance is marked as running and lives on offline node %s",
                      pnode)
           diskdata = [(nname, success, status, idx)
                       for (nname, disks) in diskstatus.items()
                       for idx, (success, status) in enumerate(disks)]
           for nname, success, bdev_status, idx in diskdata:
             # the 'ghost node' construction in Exec() ensures that we have a
             # node here
             snode = node_image[nname]
             bad_snode = snode.ghost or snode.offline
             _ErrorIf(inst_config.disks_active and
                      not success and not bad_snode,
                      constants.CV_EINSTANCEFAULTYDISK, instance,
                      "couldn't retrieve status for disk/%s on %s: %s",
                      idx, nname, bdev_status)
             _ErrorIf((inst_config.disks_active and
                       success and bdev_status.ldisk_status == constants.LDS_FAULTY),
                      constants.CV_EINSTANCEFAULTYDISK, instance,
                      "disk/%s on %s is faulty", idx, nname)
           _ErrorIf(pnode_img.rpc_fail and not pnode_img.offline,
                    constants.CV_ENODERPC, pnode, "instance %s, connection to"
                    " primary node failed", instance)
           _ErrorIf(len(inst_config.secondary_nodes) > 1,
                    constants.CV_EINSTANCELAYOUT,
                    instance, "instance has multiple secondary nodes: %s",
                    utils.CommaJoin(inst_config.secondary_nodes),
                    code=self.ETYPE_WARNING)
           es_flags = rpc.GetExclusiveStorageForNodeNames(self.cfg,
                                                          inst_config.all_nodes)
           if any(es_flags.values()):
             if inst_config.disk_template not in constants.DTS_EXCL_STORAGE:
               # Disk template not compatible with exclusive_storage: no instance
               # node should have the flag set
               es_nodes = [n
                           for (n, es) in es_flags.items()
                           if es]
               self._Error(constants.CV_EINSTANCEUNSUITABLENODE, instance,
                           "instance has template %s, which is not supported on nodes"
                           " that have exclusive storage set: %s",
                           inst_config.disk_template, utils.CommaJoin(es_nodes))
             for (idx, disk) in enumerate(inst_config.disks):
               _ErrorIf(disk.spindles is None,
                        constants.CV_EINSTANCEMISSINGCFGPARAMETER, instance,
                        "number of spindles not configured for disk %s while"
                        " exclusive storage is enabled, try running"
                        " gnt-cluster repair-disk-sizes",
                        idx)
           if inst_config.disk_template in constants.DTS_INT_MIRROR:
             instance_nodes = utils.NiceSort(inst_config.all_nodes)
             instance_groups = {}
             for node in instance_nodes:
               instance_groups.setdefault(self.all_node_info[node].group,
                                          []).append(node)
             pretty_list = [
               "%s (group %s)" % (utils.CommaJoin(nodes), groupinfo[group].name)
               # Sort so that we always list the primary node first.
               for group, nodes in sorted(instance_groups.items(),
                                          key=lambda (_, nodes): pnode in nodes,
                                          reverse=True)]
             self._ErrorIf(len(instance_groups) > 1,
                           constants.CV_EINSTANCESPLITGROUPS,
                           instance, "instance has primary and secondary nodes in"
                           " different groups: %s", utils.CommaJoin(pretty_list),
                           code=self.ETYPE_WARNING)
           inst_nodes_offline = []
           for snode in inst_config.secondary_nodes:
             s_img = node_image[snode]
             _ErrorIf(s_img.rpc_fail and not s_img.offline, constants.CV_ENODERPC,
                      snode, "instance %s, connection to secondary node failed",
                      instance)
             if s_img.offline:
               inst_nodes_offline.append(snode)
           # warn that the instance lives on offline nodes
           _ErrorIf(inst_nodes_offline, constants.CV_EINSTANCEBADNODE, instance,
                    "instance has offline secondary node(s) %s",
                    utils.CommaJoin(inst_nodes_offline))
           # ... or ghost/non-vm_capable nodes
           for node in inst_config.all_nodes:
             _ErrorIf(node_image[node].ghost, constants.CV_EINSTANCEBADNODE,
                      instance, "instance lives on ghost node %s", node)
             _ErrorIf(not node_image[node].vm_capable, constants.CV_EINSTANCEBADNODE,
                      instance, "instance lives on non-vm_capable node %s", node)
         def _VerifyOrphanVolumes(self, node_vol_should, node_image, reserved):
           """Verify if there are any unknown volumes in the cluster.
           The .os, .swap and backup volumes are ignored. All other volumes are
           reported as unknown.
           @type reserved: L{ganeti.utils.FieldSet}
           @param reserved: a FieldSet of reserved volume names
           """
           for node, n_img in node_image.items():
             if (n_img.offline or n_img.rpc_fail or n_img.lvm_fail or
                 self.all_node_info[node].group != self.group_uuid):
               # skip non-healthy nodes
               continue
             for volume in n_img.volumes:
               test = ((node not in node_vol_should or
                       volume not in node_vol_should[node]) and
                       not reserved.Matches(volume))
               self._ErrorIf(test, constants.CV_ENODEORPHANLV, node,
                             "volume %s is unknown", volume)
         def _VerifyNPlusOneMemory(self, node_image, instance_cfg):
           """Verify N+1 Memory Resilience.
           Check that if one single node dies we can still start all the
           instances it was primary for.
           """
           cluster_info = self.cfg.GetClusterInfo()
           for node, n_img in node_image.items():
             # This code checks that every node which is now listed as
             # secondary has enough memory to host all instances it is
             # supposed to should a single other node in the cluster fail.
             # FIXME: not ready for failover to an arbitrary node
             # FIXME: does not support file-backed instances
             # WARNING: we currently take into account down instances as well
             # as up ones, considering that even if they're down someone
             # might want to start them even in the event of a node failure.
             if n_img.offline or self.all_node_info[node].group != self.group_uuid:
               # we're skipping nodes marked offline and nodes in other groups from
               # the N+1 warning, since most likely we don't have good memory
               # infromation from them; we already list instances living on such
               # nodes, and that's enough warning
               continue
             #TODO(dynmem): also consider ballooning out other instances
             for prinode, instances in n_img.sbp.items():
               needed_mem = 0
               for instance in instances:
                 bep = cluster_info.FillBE(instance_cfg[instance])
                 if bep[constants.BE_AUTO_BALANCE]:
                   needed_mem += bep[constants.BE_MINMEM]
               test = n_img.mfree < needed_mem
               self._ErrorIf(test, constants.CV_ENODEN1, node,
                             "not enough memory to accomodate instance failovers"
                             " should node %s fail (%dMiB needed, %dMiB available)",
                             prinode, needed_mem, n_img.mfree)
         @classmethod
         def _VerifyFiles(cls, errorif, nodeinfo, master_node, all_nvinfo,
                          (files_all, files_opt, files_mc, files_vm)):
           """Verifies file checksums collected from all nodes.
           @param errorif: Callback for reporting errors
           @param nodeinfo: List of L{objects.Node} objects
           @param master_node: Name of master node
           @param all_nvinfo: RPC results
           """
           # Define functions determining which nodes to consider for a file
           files2nodefn = [
             (files_all, None),
             (files_mc, lambda node: (node.master_candidate or
                                      node.name == master_node)),
             (files_vm, lambda node: node.vm_capable),
+            ]
           # Build mapping from filename to list of nodes which should have the file
           nodefiles = {}
           for (files, fn) in files2nodefn:
             if fn is None:
               filenodes = nodeinfo
             else:
               filenodes = filter(fn, nodeinfo)
             nodefiles.update((filename,
                               frozenset(map(operator.attrgetter("name"), filenodes)))
                              for filename in files)
           assert set(nodefiles) == (files_all | files_mc | files_vm)
           fileinfo = dict((filename, {}) for filename in nodefiles)
           ignore_nodes = set()
           for node in nodeinfo:
             if node.offline:
               ignore_nodes.add(node.name)
               continue
             nresult = all_nvinfo[node.name]
             if nresult.fail_msg or not nresult.payload:
               node_files = None
             else:
               fingerprints = nresult.payload.get(constants.NV_FILELIST, None)
               node_files = dict((vcluster.LocalizeVirtualPath(key), value)
                                 for (key, value) in fingerprints.items())
               del fingerprints
             test = not (node_files and isinstance(node_files, dict))
             errorif(test, constants.CV_ENODEFILECHECK, node.name,
                     "Node did not return file checksum data")
             if test:
               ignore_nodes.add(node.name)
               continue
             # Build per-checksum mapping from filename to nodes having it
             for (filename, checksum) in node_files.items():
               assert filename in nodefiles
               fileinfo[filename].setdefault(checksum, set()).add(node.name)
           for (filename, checksums) in fileinfo.items():
             assert compat.all(len(i) > 10 for i in checksums), "Invalid checksum"
             # Nodes having the file
             with_file = frozenset(node_name
                                   for nodes in fileinfo[filename].values()
                                   for node_name in nodes) - ignore_nodes
             expected_nodes = nodefiles[filename] - ignore_nodes
             # Nodes missing file
             missing_file = expected_nodes - with_file
             if filename in files_opt:
               # All or no nodes
               errorif(missing_file and missing_file != expected_nodes,
                       constants.CV_ECLUSTERFILECHECK, None,
                       "File %s is optional, but it must exist on all or no"
                       " nodes (not found on %s)",
                       filename, utils.CommaJoin(utils.NiceSort(missing_file)))
             else:
               errorif(missing_file, constants.CV_ECLUSTERFILECHECK, None,
                       "File %s is missing from node(s) %s", filename,
                       utils.CommaJoin(utils.NiceSort(missing_file)))
               # Warn if a node has a file it shouldn't
               unexpected = with_file - expected_nodes
               errorif(unexpected,
                       constants.CV_ECLUSTERFILECHECK, None,
                       "File %s should not exist on node(s) %s",
                       filename, utils.CommaJoin(utils.NiceSort(unexpected)))
             # See if there are multiple versions of the file
             test = len(checksums) > 1
             if test:
               variants = ["variant %s on %s" %
                           (idx + 1, utils.CommaJoin(utils.NiceSort(nodes)))
                           for (idx, (checksum, nodes)) in
                             enumerate(sorted(checksums.items()))]
             else:
               variants = []
             errorif(test, constants.CV_ECLUSTERFILECHECK, None,
                     "File %s found with %s different checksums (%s)",
                     filename, len(checksums), "; ".join(variants))
         def _VerifyNodeDrbd(self, ninfo, nresult, instanceinfo, drbd_helper,
                             drbd_map):
           """Verifies and the node DRBD status.
           @type ninfo: L{objects.Node}
           @param ninfo: the node to check
           @param nresult: the remote results for the node
           @param instanceinfo: the dict of instances
           @param drbd_helper: the configured DRBD usermode helper
           @param drbd_map: the DRBD map as returned by
               L{ganeti.config.ConfigWriter.ComputeDRBDMap}
           """
           node = ninfo.name
           _ErrorIf = self._ErrorIf # pylint: disable=C0103
           if drbd_helper:
             helper_result = nresult.get(constants.NV_DRBDHELPER, None)
             test = (helper_result is None)
             _ErrorIf(test, constants.CV_ENODEDRBDHELPER, node,
                      "no drbd usermode helper returned")
             if helper_result:
               status, payload = helper_result
               test = not status
               _ErrorIf(test, constants.CV_ENODEDRBDHELPER, node,
                        "drbd usermode helper check unsuccessful: %s", payload)
               test = status and (payload != drbd_helper)
               _ErrorIf(test, constants.CV_ENODEDRBDHELPER, node,
                        "wrong drbd usermode helper: %s", payload)
           # compute the DRBD minors
           node_drbd = {}
           for minor, instance in drbd_map[node].items():
             test = instance not in instanceinfo
             _ErrorIf(test, constants.CV_ECLUSTERCFG, None,
                      "ghost instance '%s' in temporary DRBD map", instance)
               # ghost instance should not be running, but otherwise we
               # don't give double warnings (both ghost instance and
               # unallocated minor in use)
             if test:
               node_drbd[minor] = (instance, False)
             else:
               instance = instanceinfo[instance]
               node_drbd[minor] = (instance.name, instance.disks_active)
           # and now check them
           used_minors = nresult.get(constants.NV_DRBDLIST, [])
           test = not isinstance(used_minors, (tuple, list))
           _ErrorIf(test, constants.CV_ENODEDRBD, node,
                    "cannot parse drbd status file: %s", str(used_minors))
           if test:
             # we cannot check drbd status
             return
           for minor, (iname, must_exist) in node_drbd.items():
             test = minor not in used_minors and must_exist
             _ErrorIf(test, constants.CV_ENODEDRBD, node,
                      "drbd minor %d of instance %s is not active", minor, iname)
           for minor in used_minors:
             test = minor not in node_drbd
             _ErrorIf(test, constants.CV_ENODEDRBD, node,
                      "unallocated drbd minor %d is in use", minor)
         def _UpdateNodeOS(self, ninfo, nresult, nimg):
           """Builds the node OS structures.
           @type ninfo: L{objects.Node}
           @param ninfo: the node to check
           @param nresult: the remote results for the node
           @param nimg: the node image object
           """
           node = ninfo.name
           _ErrorIf = self._ErrorIf # pylint: disable=C0103
           remote_os = nresult.get(constants.NV_OSLIST, None)
           test = (not isinstance(remote_os, list) or
                   not compat.all(isinstance(v, list) and len(v) == 7
                                  for v in remote_os))
           _ErrorIf(test, constants.CV_ENODEOS, node,
                    "node hasn't returned valid OS data")
           nimg.os_fail = test
           if test:
             return
           os_dict = {}
           for (name, os_path, status, diagnose,
                variants, parameters, api_ver) in nresult[constants.NV_OSLIST]:
             if name not in os_dict:
               os_dict[name] = []
             # parameters is a list of lists instead of list of tuples due to
             # JSON lacking a real tuple type, fix it:
             parameters = [tuple(v) for v in parameters]
             os_dict[name].append((os_path, status, diagnose,
                                   set(variants), set(parameters), set(api_ver)))
           nimg.oslist = os_dict
         def _VerifyNodeOS(self, ninfo, nimg, base):
           """Verifies the node OS list.
           @type ninfo: L{objects.Node}
           @param ninfo: the node to check
           @param nimg: the node image object
           @param base: the 'template' node we match against (e.g. from the master)
           """
           node = ninfo.name
           _ErrorIf = self._ErrorIf # pylint: disable=C0103
           assert not nimg.os_fail, "Entered _VerifyNodeOS with failed OS rpc?"
           beautify_params = lambda l: ["%s: %s" % (k, v) for (k, v) in l]
           for os_name, os_data in nimg.oslist.items():
             assert os_data, "Empty OS status for OS %s?!" % os_name
             f_path, f_status, f_diag, f_var, f_param, f_api = os_data[0]
             _ErrorIf(not f_status, constants.CV_ENODEOS, node,
                      "Invalid OS %s (located at %s): %s", os_name, f_path, f_diag)
             _ErrorIf(len(os_data) > 1, constants.CV_ENODEOS, node,
                      "OS '%s' has multiple entries (first one shadows the rest): %s",
                      os_name, utils.CommaJoin([v[0] for v in os_data]))
             # comparisons with the 'base' image
             test = os_name not in base.oslist
             _ErrorIf(test, constants.CV_ENODEOS, node,
                      "Extra OS %s not present on reference node (%s)",
                      os_name, base.name)
             if test:
               continue
             assert base.oslist[os_name], "Base node has empty OS status?"
             _, b_status, _, b_var, b_param, b_api = base.oslist[os_name][0]
             if not b_status:
               # base OS is invalid, skipping
               continue
             for kind, a, b in [("API version", f_api, b_api),
                                ("variants list", f_var, b_var),
                                ("parameters", beautify_params(f_param),
                                 beautify_params(b_param))]:
               _ErrorIf(a != b, constants.CV_ENODEOS, node,
                        "OS %s for %s differs from reference node %s: [%s] vs. [%s]",
                        kind, os_name, base.name,
                        utils.CommaJoin(sorted(a)), utils.CommaJoin(sorted(b)))
           # check any missing OSes
           missing = set(base.oslist.keys()).difference(nimg.oslist.keys())
           _ErrorIf(missing, constants.CV_ENODEOS, node,
                    "OSes present on reference node %s but missing on this node: %s",
                    base.name, utils.CommaJoin(missing))
         def _VerifyFileStoragePaths(self, ninfo, nresult, is_master):
           """Verifies paths in L{pathutils.FILE_STORAGE_PATHS_FILE}.
           @type ninfo: L{objects.Node}
           @param ninfo: the node to check
           @param nresult: the remote results for the node
           @type is_master: bool
           @param is_master: Whether node is the master node
           """
           node = ninfo.name
           if (is_master and
               (constants.ENABLE_FILE_STORAGE or
                constants.ENABLE_SHARED_FILE_STORAGE)):
             try:
               fspaths = nresult[constants.NV_FILE_STORAGE_PATHS]
             except KeyError:
               # This should never happen
               self._ErrorIf(True, constants.CV_ENODEFILESTORAGEPATHS, node,
                             "Node did not return forbidden file storage paths")
             else:
               self._ErrorIf(fspaths, constants.CV_ENODEFILESTORAGEPATHS, node,
                             "Found forbidden file storage paths: %s",
                             utils.CommaJoin(fspaths))
           else:
             self._ErrorIf(constants.NV_FILE_STORAGE_PATHS in nresult,
                           constants.CV_ENODEFILESTORAGEPATHS, node,
                           "Node should not have returned forbidden file storage"
                           " paths")
         def _VerifyOob(self, ninfo, nresult):
           """Verifies out of band functionality of a node.
           @type ninfo: L{objects.Node}
           @param ninfo: the node to check
           @param nresult: the remote results for the node
           """
           node = ninfo.name
           # We just have to verify the paths on master and/or master candidates
           # as the oob helper is invoked on the master
           if ((ninfo.master_candidate or ninfo.master_capable) and
               constants.NV_OOB_PATHS in nresult):
             for path_result in nresult[constants.NV_OOB_PATHS]:
               self._ErrorIf(path_result, constants.CV_ENODEOOBPATH, node, path_result)
         def _UpdateNodeVolumes(self, ninfo, nresult, nimg, vg_name):
           """Verifies and updates the node volume data.
           This function will update a L{NodeImage}'s internal structures
           with data from the remote call.
           @type ninfo: L{objects.Node}
           @param ninfo: the node to check
           @param nresult: the remote results for the node
           @param nimg: the node image object
           @param vg_name: the configured VG name
           """
           node = ninfo.name
           _ErrorIf = self._ErrorIf # pylint: disable=C0103
           nimg.lvm_fail = True
           lvdata = nresult.get(constants.NV_LVLIST, "Missing LV data")
           if vg_name is None:
             pass
           elif isinstance(lvdata, basestring):
             _ErrorIf(True, constants.CV_ENODELVM, node, "LVM problem on node: %s",
                      utils.SafeEncode(lvdata))
           elif not isinstance(lvdata, dict):
             _ErrorIf(True, constants.CV_ENODELVM, node,
                      "rpc call to node failed (lvlist)")
           else:
             nimg.volumes = lvdata
             nimg.lvm_fail = False
         def _UpdateNodeInstances(self, ninfo, nresult, nimg):
           """Verifies and updates the node instance list.
           If the listing was successful, then updates this node's instance
           list. Otherwise, it marks the RPC call as failed for the instance
           list key.
           @type ninfo: L{objects.Node}
           @param ninfo: the node to check
           @param nresult: the remote results for the node
           @param nimg: the node image object
           """
           idata = nresult.get(constants.NV_INSTANCELIST, None)
           test = not isinstance(idata, list)
           self._ErrorIf(test, constants.CV_ENODEHV, ninfo.name,
                         "rpc call to node failed (instancelist): %s",
                         utils.SafeEncode(str(idata)))
           if test:
             nimg.hyp_fail = True
           else:
             nimg.instances = idata
         def _UpdateNodeInfo(self, ninfo, nresult, nimg, vg_name):
           """Verifies and computes a node information map
           @type ninfo: L{objects.Node}
           @param ninfo: the node to check
           @param nresult: the remote results for the node
           @param nimg: the node image object
           @param vg_name: the configured VG name
           """
           node = ninfo.name
           _ErrorIf = self._ErrorIf # pylint: disable=C0103
           # try to read free memory (from the hypervisor)
           hv_info = nresult.get(constants.NV_HVINFO, None)
           test = not isinstance(hv_info, dict) or "memory_free" not in hv_info
           _ErrorIf(test, constants.CV_ENODEHV, node,
                    "rpc call to node failed (hvinfo)")
           if not test:
             try:
               nimg.mfree = int(hv_info["memory_free"])
             except (ValueError, TypeError):
               _ErrorIf(True, constants.CV_ENODERPC, node,
                        "node returned invalid nodeinfo, check hypervisor")
           # FIXME: devise a free space model for file based instances as well
           if vg_name is not None:
             test = (constants.NV_VGLIST not in nresult or
                     vg_name not in nresult[constants.NV_VGLIST])
             _ErrorIf(test, constants.CV_ENODELVM, node,
                      "node didn't return data for the volume group '%s'"
                      " - it is either missing or broken", vg_name)
             if not test:
               try:
                 nimg.dfree = int(nresult[constants.NV_VGLIST][vg_name])
               except (ValueError, TypeError):
                 _ErrorIf(True, constants.CV_ENODERPC, node,
                          "node returned invalid LVM info, check LVM status")
         def _CollectDiskInfo(self, nodelist, node_image, instanceinfo):
           """Gets per-disk status information for all instances.
           @type nodelist: list of strings
           @param nodelist: Node names
           @type node_image: dict of (name, L{objects.Node})
           @param node_image: Node objects
           @type instanceinfo: dict of (name, L{objects.Instance})
           @param instanceinfo: Instance objects
           @rtype: {instance: {node: [(succes, payload)]}}
           @return: a dictionary of per-instance dictionaries with nodes as
               keys and disk information as values; the disk information is a
               list of tuples (success, payload)
           """
           _ErrorIf = self._ErrorIf # pylint: disable=C0103
           node_disks = {}
           node_disks_devonly = {}
           diskless_instances = set()
           diskless = constants.DT_DISKLESS
           for nname in nodelist:
             node_instances = list(itertools.chain(node_image[nname].pinst,
                                                   node_image[nname].sinst))
             diskless_instances.update(inst for inst in node_instances
                                       if instanceinfo[inst].disk_template == diskless)
             disks = [(inst, disk)
                      for inst in node_instances
                      for disk in instanceinfo[inst].disks]
             if not disks:
               # No need to collect data
               continue
             node_disks[nname] = disks
             # _AnnotateDiskParams makes already copies of the disks
             devonly = []
             for (inst, dev) in disks:
               (anno_disk,) = AnnotateDiskParams(instanceinfo[inst], [dev], self.cfg)
               self.cfg.SetDiskID(anno_disk, nname)
               devonly.append(anno_disk)
             node_disks_devonly[nname] = devonly
           assert len(node_disks) == len(node_disks_devonly)
           # Collect data from all nodes with disks
           result = self.rpc.call_blockdev_getmirrorstatus_multi(node_disks.keys(),
                                                                 node_disks_devonly)
           assert len(result) == len(node_disks)
           instdisk = {}
           for (nname, nres) in result.items():
             disks = node_disks[nname]
             if nres.offline:
               # No data from this node
               data = len(disks) * [(False, "node offline")]
             else:
               msg = nres.fail_msg
               _ErrorIf(msg, constants.CV_ENODERPC, nname,
                        "while getting disk information: %s", msg)
               if msg:
                 # No data from this node
                 data = len(disks) * [(False, msg)]
               else:
                 data = []
                 for idx, i in enumerate(nres.payload):
                   if isinstance(i, (tuple, list)) and len(i) == 2:
                     data.append(i)
                   else:
                     logging.warning("Invalid result from node %s, entry %d: %s",
                                     nname, idx, i)
                     data.append((False, "Invalid result from the remote node"))
             for ((inst, _), status) in zip(disks, data):
               instdisk.setdefault(inst, {}).setdefault(nname, []).append(status)
           # Add empty entries for diskless instances.
           for inst in diskless_instances:
             assert inst not in instdisk
             instdisk[inst] = {}
           assert compat.all(len(statuses) == len(instanceinfo[inst].disks) and
                             len(nnames) <= len(instanceinfo[inst].all_nodes) and
                             compat.all(isinstance(s, (tuple, list)) and
                                        len(s) == 2 for s in statuses)
                             for inst, nnames in instdisk.items()
                             for nname, statuses in nnames.items())
           if __debug__:
             instdisk_keys = set(instdisk)
             instanceinfo_keys = set(instanceinfo)
             assert instdisk_keys == instanceinfo_keys, \
               ("instdisk keys (%s) do not match instanceinfo keys (%s)" %
                (instdisk_keys, instanceinfo_keys))
           return instdisk
         @staticmethod
         def _SshNodeSelector(group_uuid, all_nodes):
           """Create endless iterators for all potential SSH check hosts.
           """
           nodes = [node for node in all_nodes
                    if (node.group != group_uuid and
                        not node.offline)]
           keyfunc = operator.attrgetter("group")
           return map(itertools.cycle,
                      [sorted(map(operator.attrgetter("name"), names))
                       for _, names in itertools.groupby(sorted(nodes, key=keyfunc),
                                                         keyfunc)])
         @classmethod
         def _SelectSshCheckNodes(cls, group_nodes, group_uuid, all_nodes):
           """Choose which nodes should talk to which other nodes.
           We will make nodes contact all nodes in their group, and one node from
           every other group.
           @warning: This algorithm has a known issue if one node group is much
             smaller than others (e.g. just one node). In such a case all other
             nodes will talk to the single node.
           """
           online_nodes = sorted(node.name for node in group_nodes if not node.offline)
           sel = cls._SshNodeSelector(group_uuid, all_nodes)
           return (online_nodes,
                   dict((name, sorted([i.next() for i in sel]))
                        for name in online_nodes))
         def BuildHooksEnv(self):
           """Build hooks env.
           Cluster-Verify hooks just ran in the post phase and their failure makes
           the output be logged in the verify output and the verification to fail.
           """
           env = {
             "CLUSTER_TAGS": " ".join(self.cfg.GetClusterInfo().GetTags()),
+            }
           env.update(("NODE_TAGS_%s" % node.name, " ".join(node.GetTags()))
                      for node in self.my_node_info.values())
           return env
         def BuildHooksNodes(self):
           """Build hooks nodes.
           """
           return ([], self.my_node_names)
         def Exec(self, feedback_fn):
           """Verify integrity of the node group, performing various test on nodes.
           """
           # This method has too many local variables. pylint: disable=R0914
           feedback_fn("* Verifying group '%s'" % self.group_info.name)
           if not self.my_node_names:
             # empty node group
             feedback_fn("* Empty node group, skipping verification")
             return True
           self.bad = False
           _ErrorIf = self._ErrorIf # pylint: disable=C0103
           verbose = self.op.verbose
           self._feedback_fn = feedback_fn
           vg_name = self.cfg.GetVGName()
           drbd_helper = self.cfg.GetDRBDHelper()
           cluster = self.cfg.GetClusterInfo()
           hypervisors = cluster.enabled_hypervisors
           node_data_list = [self.my_node_info[name] for name in self.my_node_names]
           i_non_redundant = [] # Non redundant instances
           i_non_a_balanced = [] # Non auto-balanced instances
           i_offline = 0 # Count of offline instances
           n_offline = 0 # Count of offline nodes
           n_drained = 0 # Count of nodes being drained
           node_vol_should = {}
           # FIXME: verify OS list
           # File verification
           filemap = ComputeAncillaryFiles(cluster, False)
           # do local checksums
           master_node = self.master_node = self.cfg.GetMasterNode()
           master_ip = self.cfg.GetMasterIP()
           feedback_fn("* Gathering data (%d nodes)" % len(self.my_node_names))
           user_scripts = []
           if self.cfg.GetUseExternalMipScript():
             user_scripts.append(pathutils.EXTERNAL_MASTER_SETUP_SCRIPT)
           node_verify_param = {
             constants.NV_FILELIST:
               map(vcluster.MakeVirtualPath,
                   utils.UniqueSequence(filename
                                        for files in filemap
                                        for filename in files)),
             constants.NV_NODELIST:
               self._SelectSshCheckNodes(node_data_list, self.group_uuid,
                                         self.all_node_info.values()),
             constants.NV_HYPERVISOR: hypervisors,
             constants.NV_HVPARAMS:
               _GetAllHypervisorParameters(cluster, self.all_inst_info.values()),
             constants.NV_NODENETTEST: [(node.name, node.primary_ip, node.secondary_ip)
                                        for node in node_data_list
                                        if not node.offline],
             constants.NV_INSTANCELIST: hypervisors,
             constants.NV_VERSION: None,
             constants.NV_HVINFO: self.cfg.GetHypervisorType(),
             constants.NV_NODESETUP: None,
             constants.NV_TIME: None,
             constants.NV_MASTERIP: (master_node, master_ip),
             constants.NV_OSLIST: None,
             constants.NV_VMNODES: self.cfg.GetNonVmCapableNodeList(),
             constants.NV_USERSCRIPTS: user_scripts,
+            }
           if vg_name is not None:
             node_verify_param[constants.NV_VGLIST] = None
             node_verify_param[constants.NV_LVLIST] = vg_name
             node_verify_param[constants.NV_PVLIST] = [vg_name]
           if drbd_helper:
             node_verify_param[constants.NV_DRBDVERSION] = None
             node_verify_param[constants.NV_DRBDLIST] = None
             node_verify_param[constants.NV_DRBDHELPER] = drbd_helper
           if constants.ENABLE_FILE_STORAGE or constants.ENABLE_SHARED_FILE_STORAGE:
             # Load file storage paths only from master node
             node_verify_param[constants.NV_FILE_STORAGE_PATHS] = master_node
           # bridge checks
           # FIXME: this needs to be changed per node-group, not cluster-wide
           bridges = set()
           default_nicpp = cluster.nicparams[constants.PP_DEFAULT]
           if default_nicpp[constants.NIC_MODE] == constants.NIC_MODE_BRIDGED:
             bridges.add(default_nicpp[constants.NIC_LINK])
           for instance in self.my_inst_info.values():
             for nic in instance.nics:
               full_nic = cluster.SimpleFillNIC(nic.nicparams)
               if full_nic[constants.NIC_MODE] == constants.NIC_MODE_BRIDGED:
                 bridges.add(full_nic[constants.NIC_LINK])
           if bridges:
             node_verify_param[constants.NV_BRIDGES] = list(bridges)
           # Build our expected cluster state
           node_image = dict((node.name, self.NodeImage(offline=node.offline,
                                                        name=node.name,
                                                        vm_capable=node.vm_capable))
                             for node in node_data_list)
           # Gather OOB paths
           oob_paths = []
           for node in self.all_node_info.values():
             path = SupportsOob(self.cfg, node)
             if path and path not in oob_paths:
               oob_paths.append(path)
           if oob_paths:
             node_verify_param[constants.NV_OOB_PATHS] = oob_paths
           for instance in self.my_inst_names:
             inst_config = self.my_inst_info[instance]
             if inst_config.admin_state == constants.ADMINST_OFFLINE:
               i_offline += 1
             for nname in inst_config.all_nodes:
               if nname not in node_image:
                 gnode = self.NodeImage(name=nname)
                 gnode.ghost = (nname not in self.all_node_info)
                 node_image[nname] = gnode
             inst_config.MapLVsByNode(node_vol_should)
             pnode = inst_config.primary_node
             node_image[pnode].pinst.append(instance)
             for snode in inst_config.secondary_nodes:
               nimg = node_image[snode]
               nimg.sinst.append(instance)
               if pnode not in nimg.sbp:
                 nimg.sbp[pnode] = []
               nimg.sbp[pnode].append(instance)
           es_flags = rpc.GetExclusiveStorageForNodeNames(self.cfg, self.my_node_names)
           # The value of exclusive_storage should be the same across the group, so if
           # it's True for at least a node, we act as if it were set for all the nodes
           self._exclusive_storage = compat.any(es_flags.values())
           if self._exclusive_storage:
             node_verify_param[constants.NV_EXCLUSIVEPVS] = True
           # At this point, we have the in-memory data structures complete,
           # except for the runtime information, which we'll gather next
           # Due to the way our RPC system works, exact response times cannot be
           # guaranteed (e.g. a broken node could run into a timeout). By keeping the
           # time before and after executing the request, we can at least have a time
           # window.
           nvinfo_starttime = time.time()
           all_nvinfo = self.rpc.call_node_verify(self.my_node_names,
                                                  node_verify_param,
                                                  self.cfg.GetClusterName())
           nvinfo_endtime = time.time()
           if self.extra_lv_nodes and vg_name is not None:
             extra_lv_nvinfo = \
                 self.rpc.call_node_verify(self.extra_lv_nodes,
                                           {constants.NV_LVLIST: vg_name},
                                           self.cfg.GetClusterName())
           else:
             extra_lv_nvinfo = {}
           all_drbd_map = self.cfg.ComputeDRBDMap()
           feedback_fn("* Gathering disk information (%s nodes)" %
                       len(self.my_node_names))
           instdisk = self._CollectDiskInfo(self.my_node_names, node_image,
                                            self.my_inst_info)
           feedback_fn("* Verifying configuration file consistency")
           # If not all nodes are being checked, we need to make sure the master node
           # and a non-checked vm_capable node are in the list.
           absent_nodes = set(self.all_node_info).difference(self.my_node_info)
           if absent_nodes:
             vf_nvinfo = all_nvinfo.copy()
             vf_node_info = list(self.my_node_info.values())
             additional_nodes = []
             if master_node not in self.my_node_info:
               additional_nodes.append(master_node)
               vf_node_info.append(self.all_node_info[master_node])
             # Add the first vm_capable node we find which is not included,
             # excluding the master node (which we already have)
             for node in absent_nodes:
               nodeinfo = self.all_node_info[node]
               if (nodeinfo.vm_capable and not nodeinfo.offline and
                   node != master_node):
                 additional_nodes.append(node)
                 vf_node_info.append(self.all_node_info[node])
                 break
             key = constants.NV_FILELIST
             vf_nvinfo.update(self.rpc.call_node_verify(additional_nodes,
                                                        {key: node_verify_param[key]},
                                                        self.cfg.GetClusterName()))
           else:
             vf_nvinfo = all_nvinfo
             vf_node_info = self.my_node_info.values()
           self._VerifyFiles(_ErrorIf, vf_node_info, master_node, vf_nvinfo, filemap)
           feedback_fn("* Verifying node status")
           refos_img = None
           for node_i in node_data_list:
             node = node_i.name
             nimg = node_image[node]
             if node_i.offline:
               if verbose:
                 feedback_fn("* Skipping offline node %s" % (node,))
               n_offline += 1
               continue
             if node == master_node:
               ntype = "master"
             elif node_i.master_candidate:
               ntype = "master candidate"
             elif node_i.drained:
               ntype = "drained"
               n_drained += 1
             else:
               ntype = "regular"
             if verbose:
               feedback_fn("* Verifying node %s (%s)" % (node, ntype))
             msg = all_nvinfo[node].fail_msg
             _ErrorIf(msg, constants.CV_ENODERPC, node, "while contacting node: %s",
                      msg)
             if msg:
               nimg.rpc_fail = True
               continue
             nresult = all_nvinfo[node].payload
             nimg.call_ok = self._VerifyNode(node_i, nresult)
             self._VerifyNodeTime(node_i, nresult, nvinfo_starttime, nvinfo_endtime)
             self._VerifyNodeNetwork(node_i, nresult)
             self._VerifyNodeUserScripts(node_i, nresult)
             self._VerifyOob(node_i, nresult)
             self._VerifyFileStoragePaths(node_i, nresult,
                                          node == master_node)
             if nimg.vm_capable:
               self._UpdateVerifyNodeLVM(node_i, nresult, vg_name, nimg)
               self._VerifyNodeDrbd(node_i, nresult, self.all_inst_info, drbd_helper,
                                    all_drbd_map)
               self._UpdateNodeVolumes(node_i, nresult, nimg, vg_name)
               self._UpdateNodeInstances(node_i, nresult, nimg)
               self._UpdateNodeInfo(node_i, nresult, nimg, vg_name)
               self._UpdateNodeOS(node_i, nresult, nimg)
               if not nimg.os_fail:
                 if refos_img is None:
                   refos_img = nimg
                 self._VerifyNodeOS(node_i, nimg, refos_img)
               self._VerifyNodeBridges(node_i, nresult, bridges)
               # Check whether all running instancies are primary for the node. (This
               # can no longer be done from _VerifyInstance below, since some of the
               # wrong instances could be from other node groups.)
               non_primary_inst = set(nimg.instances).difference(nimg.pinst)
               for inst in non_primary_inst:
                 test = inst in self.all_inst_info
                 _ErrorIf(test, constants.CV_EINSTANCEWRONGNODE, inst,
                          "instance should not run on node %s", node_i.name)
                 _ErrorIf(not test, constants.CV_ENODEORPHANINSTANCE, node_i.name,
                          "node is running unknown instance %s", inst)
           self._VerifyGroupDRBDVersion(all_nvinfo)
           self._VerifyGroupLVM(node_image, vg_name)
           for node, result in extra_lv_nvinfo.items():
             self._UpdateNodeVolumes(self.all_node_info[node], result.payload,
                                     node_image[node], vg_name)
           feedback_fn("* Verifying instance status")
           for instance in self.my_inst_names:
             if verbose:
               feedback_fn("* Verifying instance %s" % instance)
             inst_config = self.my_inst_info[instance]
             self._VerifyInstance(instance, inst_config, node_image,
                                  instdisk[instance])
             # If the instance is non-redundant we cannot survive losing its primary
             # node, so we are not N+1 compliant.
             if inst_config.disk_template not in constants.DTS_MIRRORED:
               i_non_redundant.append(instance)
             if not cluster.FillBE(inst_config)[constants.BE_AUTO_BALANCE]:
               i_non_a_balanced.append(instance)
           feedback_fn("* Verifying orphan volumes")
           reserved = utils.FieldSet(*cluster.reserved_lvs)
           # We will get spurious "unknown volume" warnings if any node of this group
           # is secondary for an instance whose primary is in another group. To avoid
           # them, we find these instances and add their volumes to node_vol_should.
           for inst in self.all_inst_info.values():
             for secondary in inst.secondary_nodes:
               if (secondary in self.my_node_info
                   and inst.name not in self.my_inst_info):
                 inst.MapLVsByNode(node_vol_should)
                 break
           self._VerifyOrphanVolumes(node_vol_should, node_image, reserved)
           if constants.VERIFY_NPLUSONE_MEM not in self.op.skip_checks:
             feedback_fn("* Verifying N+1 Memory redundancy")
             self._VerifyNPlusOneMemory(node_image, self.my_inst_info)
           feedback_fn("* Other Notes")
           if i_non_redundant:
             feedback_fn("  - NOTICE: %d non-redundant instance(s) found."
                         % len(i_non_redundant))
           if i_non_a_balanced:
             feedback_fn("  - NOTICE: %d non-auto-balanced instance(s) found."
                         % len(i_non_a_balanced))
           if i_offline:
             feedback_fn("  - NOTICE: %d offline instance(s) found." % i_offline)
           if n_offline:
             feedback_fn("  - NOTICE: %d offline node(s) found." % n_offline)
           if n_drained:
             feedback_fn("  - NOTICE: %d drained node(s) found." % n_drained)
           return not self.bad
         def HooksCallBack(self, phase, hooks_results, feedback_fn, lu_result):
           """Analyze the post-hooks' result
           This method analyses the hook result, handles it, and sends some
           nicely-formatted feedback back to the user.
           @param phase: one of L{constants.HOOKS_PHASE_POST} or
               L{constants.HOOKS_PHASE_PRE}; it denotes the hooks phase
           @param hooks_results: the results of the multi-node hooks rpc call
           @param feedback_fn: function used send feedback back to the caller
           @param lu_result: previous Exec result
           @return: the new Exec result, based on the previous result
               and hook results
           """
           # We only really run POST phase hooks, only for non-empty groups,
           # and are only interested in their results
           if not self.my_node_names:
             # empty node group
             pass
           elif phase == constants.HOOKS_PHASE_POST:
             # Used to change hooks' output to proper indentation
             feedback_fn("* Hooks Results")
             assert hooks_results, "invalid result from hooks"
             for node_name in hooks_results:
               res = hooks_results[node_name]
               msg = res.fail_msg
               test = msg and not res.offline
               self._ErrorIf(test, constants.CV_ENODEHOOKS, node_name,
                             "Communication failure in hooks execution: %s", msg)
               if res.offline or msg:
                 # No need to investigate payload if node is offline or gave
                 # an error.
                 continue
               for script, hkr, output in res.payload:
                 test = hkr == constants.HKR_FAIL
                 self._ErrorIf(test, constants.CV_ENODEHOOKS, node_name,
                               "Script %s failed, output:", script)
                 if test:
                   output = self._HOOKS_INDENT_RE.sub("      ", output)
                   feedback_fn("%s" % output)
                   lu_result = False
           return lu_result
       class LUClusterVerifyDisks(NoHooksLU):
         """Verifies the cluster disks status.
         """
         REQ_BGL = False
         def ExpandNames(self):
           self.share_locks = ShareAll()
           self.needed_locks = {
             locking.LEVEL_NODEGROUP: locking.ALL_SET,
+            }
         def Exec(self, feedback_fn):
           group_names = self.owned_locks(locking.LEVEL_NODEGROUP)
           # Submit one instance of L{opcodes.OpGroupVerifyDisks} per node group
           return ResultWithJobs([[opcodes.OpGroupVerifyDisks(group_name=group)]
                                  for group in group_names])

Synnefo » snf-ganeti

root / lib / cmdlib / cluster.py @ c7dd65be