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+      #
+      #
       # Copyright (C) 2006, 2007, 2008 Google Inc.
+      #
       # This program is free software; you can redistribute it and/or modify
       # it under the terms of the GNU General Public License as published by
       # the Free Software Foundation; either version 2 of the License, or
       # (at your option) any later version.
+      #
       # This program is distributed in the hope that it will be useful, but
       # WITHOUT ANY WARRANTY; without even the implied warranty of
       # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
       # General Public License for more details.
+      #
       # You should have received a copy of the GNU General Public License
       # along with this program; if not, write to the Free Software
       # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
       # 02110-1301, USA.
       """Module implementing the master-side code."""
       # pylint: disable-msg=W0613,W0201
       import os
       import os.path
       import sha
       import time
       import tempfile
       import re
       import platform
       from ganeti import rpc
       from ganeti import ssh
       from ganeti import logger
       from ganeti import utils
       from ganeti import errors
       from ganeti import hypervisor
       from ganeti import config
       from ganeti import constants
       from ganeti import objects
       from ganeti import opcodes
       from ganeti import ssconf
       from ganeti import serializer
       class LogicalUnit(object):
         """Logical Unit base class.
         Subclasses must follow these rules:
           - implement CheckPrereq which also fills in the opcode instance
             with all the fields (even if as None)
           - implement Exec
           - implement BuildHooksEnv
           - redefine HPATH and HTYPE
           - optionally redefine their run requirements (REQ_MASTER); note that all
             commands require root permissions
         """
         HPATH = None
         HTYPE = None
         _OP_REQP = []
         REQ_MASTER = True
         def __init__(self, processor, op, cfg, sstore):
           """Constructor for LogicalUnit.
           This needs to be overriden in derived classes in order to check op
           validity.
           """
           self.proc = processor
           self.op = op
           self.cfg = cfg
           self.sstore = sstore
           self.__ssh = None
           for attr_name in self._OP_REQP:
             attr_val = getattr(op, attr_name, None)
             if attr_val is None:
               raise errors.OpPrereqError("Required parameter '%s' missing" %
                                          attr_name)
           if not cfg.IsCluster():
             raise errors.OpPrereqError("Cluster not initialized yet,"
                                        " use 'gnt-cluster init' first.")
           if self.REQ_MASTER:
             master = sstore.GetMasterNode()
             if master != utils.HostInfo().name:
               raise errors.OpPrereqError("Commands must be run on the master"
                                          " node %s" % master)
         def __GetSSH(self):
           """Returns the SshRunner object
           """
           if not self.__ssh:
             self.__ssh = ssh.SshRunner(self.sstore)
           return self.__ssh
         ssh = property(fget=__GetSSH)
         def CheckPrereq(self):
           """Check prerequisites for this LU.
           This method should check that the prerequisites for the execution
           of this LU are fulfilled. It can do internode communication, but
           it should be idempotent - no cluster or system changes are
           allowed.
           The method should raise errors.OpPrereqError in case something is
           not fulfilled. Its return value is ignored.
           This method should also update all the parameters of the opcode to
           their canonical form; e.g. a short node name must be fully
           expanded after this method has successfully completed (so that
           hooks, logging, etc. work correctly).
           """
           raise NotImplementedError
         def Exec(self, feedback_fn):
           """Execute the LU.
           This method should implement the actual work. It should raise
           errors.OpExecError for failures that are somewhat dealt with in
           code, or expected.
           """
           raise NotImplementedError
         def BuildHooksEnv(self):
           """Build hooks environment for this LU.
           This method should return a three-node tuple consisting of: a dict
           containing the environment that will be used for running the
           specific hook for this LU, a list of node names on which the hook
           should run before the execution, and a list of node names on which
           the hook should run after the execution.
           The keys of the dict must not have 'GANETI_' prefixed as this will
           be handled in the hooks runner. Also note additional keys will be
           added by the hooks runner. If the LU doesn't define any
           environment, an empty dict (and not None) should be returned.
           No nodes should be returned as an empty list (and not None).
           Note that if the HPATH for a LU class is None, this function will
           not be called.
           """
           raise NotImplementedError
         def HooksCallBack(self, phase, hook_results, feedback_fn, lu_result):
           """Notify the LU about the results of its hooks.
           This method is called every time a hooks phase is executed, and notifies
           the Logical Unit about the hooks' result. The LU can then use it to alter
           its result based on the hooks.  By default the method does nothing and the
           previous result is passed back unchanged but any LU can define it if it
           wants to use the local cluster hook-scripts somehow.
           Args:
             phase: the hooks phase that has just been run
             hooks_results: the results of the multi-node hooks rpc call
             feedback_fn: function to send feedback back to the caller
             lu_result: the previous result this LU had, or None in the PRE phase.
           """
           return lu_result
       class NoHooksLU(LogicalUnit):
         """Simple LU which runs no hooks.
         This LU is intended as a parent for other LogicalUnits which will
         run no hooks, in order to reduce duplicate code.
         """
         HPATH = None
         HTYPE = None
       def _AddHostToEtcHosts(hostname):
         """Wrapper around utils.SetEtcHostsEntry.
         """
         hi = utils.HostInfo(name=hostname)
         utils.SetEtcHostsEntry(constants.ETC_HOSTS, hi.ip, hi.name, [hi.ShortName()])
       def _RemoveHostFromEtcHosts(hostname):
         """Wrapper around utils.RemoveEtcHostsEntry.
         """
         hi = utils.HostInfo(name=hostname)
         utils.RemoveEtcHostsEntry(constants.ETC_HOSTS, hi.name)
         utils.RemoveEtcHostsEntry(constants.ETC_HOSTS, hi.ShortName())
       def _GetWantedNodes(lu, nodes):
         """Returns list of checked and expanded node names.
         Args:
           nodes: List of nodes (strings) or None for all
         """
         if not isinstance(nodes, list):
           raise errors.OpPrereqError("Invalid argument type 'nodes'")
         if nodes:
           wanted = []
           for name in nodes:
             node = lu.cfg.ExpandNodeName(name)
             if node is None:
               raise errors.OpPrereqError("No such node name '%s'" % name)
             wanted.append(node)
         else:
           wanted = lu.cfg.GetNodeList()
         return utils.NiceSort(wanted)
       def _GetWantedInstances(lu, instances):
         """Returns list of checked and expanded instance names.
         Args:
           instances: List of instances (strings) or None for all
         """
         if not isinstance(instances, list):
           raise errors.OpPrereqError("Invalid argument type 'instances'")
         if instances:
           wanted = []
           for name in instances:
             instance = lu.cfg.ExpandInstanceName(name)
             if instance is None:
               raise errors.OpPrereqError("No such instance name '%s'" % name)
             wanted.append(instance)
         else:
           wanted = lu.cfg.GetInstanceList()
         return utils.NiceSort(wanted)
       def _CheckOutputFields(static, dynamic, selected):
         """Checks whether all selected fields are valid.
         Args:
           static: Static fields
           dynamic: Dynamic fields
         """
         static_fields = frozenset(static)
         dynamic_fields = frozenset(dynamic)
         all_fields = static_fields | dynamic_fields
         if not all_fields.issuperset(selected):
           raise errors.OpPrereqError("Unknown output fields selected: %s"
                                      % ",".join(frozenset(selected).
                                                 difference(all_fields)))
       def _BuildInstanceHookEnv(name, primary_node, secondary_nodes, os_type, status,
                                 memory, vcpus, nics):
         """Builds instance related env variables for hooks from single variables.
         Args:
           secondary_nodes: List of secondary nodes as strings
         """
         env = {
           "OP_TARGET": name,
           "INSTANCE_NAME": name,
           "INSTANCE_PRIMARY": primary_node,
           "INSTANCE_SECONDARIES": " ".join(secondary_nodes),
           "INSTANCE_OS_TYPE": os_type,
           "INSTANCE_STATUS": status,
           "INSTANCE_MEMORY": memory,
           "INSTANCE_VCPUS": vcpus,
+        }
         if nics:
           nic_count = len(nics)
           for idx, (ip, bridge, mac) in enumerate(nics):
             if ip is None:
               ip = ""
             env["INSTANCE_NIC%d_IP" % idx] = ip
             env["INSTANCE_NIC%d_BRIDGE" % idx] = bridge
             env["INSTANCE_NIC%d_HWADDR" % idx] = mac
         else:
           nic_count = 0
         env["INSTANCE_NIC_COUNT"] = nic_count
         return env
       def _BuildInstanceHookEnvByObject(instance, override=None):
         """Builds instance related env variables for hooks from an object.
         Args:
           instance: objects.Instance object of instance
           override: dict of values to override
         """
         args = {
           'name': instance.name,
           'primary_node': instance.primary_node,
           'secondary_nodes': instance.secondary_nodes,
           'os_type': instance.os,
           'status': instance.os,
           'memory': instance.memory,
           'vcpus': instance.vcpus,
           'nics': [(nic.ip, nic.bridge, nic.mac) for nic in instance.nics],
+        }
         if override:
           args.update(override)
         return _BuildInstanceHookEnv(**args)
       def _HasValidVG(vglist, vgname):
         """Checks if the volume group list is valid.
         A non-None return value means there's an error, and the return value
         is the error message.
         """
         vgsize = vglist.get(vgname, None)
         if vgsize is None:
           return "volume group '%s' missing" % vgname
         elif vgsize < 20480:
           return ("volume group '%s' too small (20480MiB required, %dMib found)" %
                   (vgname, vgsize))
         return None
       def _InitSSHSetup(node):
         """Setup the SSH configuration for the cluster.
         This generates a dsa keypair for root, adds the pub key to the
         permitted hosts and adds the hostkey to its own known hosts.
         Args:
           node: the name of this host as a fqdn
         """
         priv_key, pub_key, auth_keys = ssh.GetUserFiles(constants.GANETI_RUNAS)
         for name in priv_key, pub_key:
           if os.path.exists(name):
             utils.CreateBackup(name)
           utils.RemoveFile(name)
         result = utils.RunCmd(["ssh-keygen", "-t", "dsa",
                                "-f", priv_key,
                                "-q", "-N", ""])
         if result.failed:
           raise errors.OpExecError("Could not generate ssh keypair, error %s" %
                                    result.output)
         f = open(pub_key, 'r')
         try:
           utils.AddAuthorizedKey(auth_keys, f.read(8192))
         finally:
           f.close()
       def _InitGanetiServerSetup(ss):
         """Setup the necessary configuration for the initial node daemon.
         This creates the nodepass file containing the shared password for
         the cluster and also generates the SSL certificate.
         """
         # Create pseudo random password
         randpass = sha.new(os.urandom(64)).hexdigest()
         # and write it into sstore
         ss.SetKey(ss.SS_NODED_PASS, randpass)
         result = utils.RunCmd(["openssl", "req", "-new", "-newkey", "rsa:1024",
                                "-days", str(365*5), "-nodes", "-x509",
                                "-keyout", constants.SSL_CERT_FILE,
                                "-out", constants.SSL_CERT_FILE, "-batch"])
         if result.failed:
           raise errors.OpExecError("could not generate server ssl cert, command"
                                    " %s had exitcode %s and error message %s" %
                                    (result.cmd, result.exit_code, result.output))
         os.chmod(constants.SSL_CERT_FILE, 0400)
         result = utils.RunCmd([constants.NODE_INITD_SCRIPT, "restart"])
         if result.failed:
           raise errors.OpExecError("Could not start the node daemon, command %s"
                                    " had exitcode %s and error %s" %
                                    (result.cmd, result.exit_code, result.output))
       def _CheckInstanceBridgesExist(instance):
         """Check that the brigdes needed by an instance exist.
         """
         # check bridges existance
         brlist = [nic.bridge for nic in instance.nics]
         if not rpc.call_bridges_exist(instance.primary_node, brlist):
           raise errors.OpPrereqError("one or more target bridges %s does not"
                                      " exist on destination node '%s'" %
                                      (brlist, instance.primary_node))
       class LUInitCluster(LogicalUnit):
         """Initialise the cluster.
         """
         HPATH = "cluster-init"
         HTYPE = constants.HTYPE_CLUSTER
         _OP_REQP = ["cluster_name", "hypervisor_type", "mac_prefix",
                     "def_bridge", "master_netdev", "file_storage_dir"]
         REQ_CLUSTER = False
         def BuildHooksEnv(self):
           """Build hooks env.
           Notes: Since we don't require a cluster, we must manually add
           ourselves in the post-run node list.
           """
           env = {"OP_TARGET": self.op.cluster_name}
           return env, [], [self.hostname.name]
         def CheckPrereq(self):
           """Verify that the passed name is a valid one.
           """
           if config.ConfigWriter.IsCluster():
             raise errors.OpPrereqError("Cluster is already initialised")
           if self.op.hypervisor_type == constants.HT_XEN_HVM31:
             if not os.path.exists(constants.VNC_PASSWORD_FILE):
               raise errors.OpPrereqError("Please prepare the cluster VNC"
                                          "password file %s" %
                                          constants.VNC_PASSWORD_FILE)
           self.hostname = hostname = utils.HostInfo()
           if hostname.ip.startswith("127."):
             raise errors.OpPrereqError("This host's IP resolves to the private"
                                        " range (%s). Please fix DNS or %s." %
                                        (hostname.ip, constants.ETC_HOSTS))
           if not utils.TcpPing(hostname.ip, constants.DEFAULT_NODED_PORT,
                                source=constants.LOCALHOST_IP_ADDRESS):
             raise errors.OpPrereqError("Inconsistency: this host's name resolves"
                                        " to %s,\nbut this ip address does not"
                                        " belong to this host."
                                        " Aborting." % hostname.ip)
           self.clustername = clustername = utils.HostInfo(self.op.cluster_name)
           if utils.TcpPing(clustername.ip, constants.DEFAULT_NODED_PORT,
                            timeout=5):
             raise errors.OpPrereqError("Cluster IP already active. Aborting.")
           secondary_ip = getattr(self.op, "secondary_ip", None)
           if secondary_ip and not utils.IsValidIP(secondary_ip):
             raise errors.OpPrereqError("Invalid secondary ip given")
           if (secondary_ip and
               secondary_ip != hostname.ip and
               (not utils.TcpPing(secondary_ip, constants.DEFAULT_NODED_PORT,
                                  source=constants.LOCALHOST_IP_ADDRESS))):
             raise errors.OpPrereqError("You gave %s as secondary IP,"
                                        " but it does not belong to this host." %
                                        secondary_ip)
           self.secondary_ip = secondary_ip
           if not hasattr(self.op, "vg_name"):
             self.op.vg_name = None
           # if vg_name not None, checks if volume group is valid
           if self.op.vg_name:
             vgstatus = _HasValidVG(utils.ListVolumeGroups(), self.op.vg_name)
             if vgstatus:
               raise errors.OpPrereqError("Error: %s\nspecify --no-lvm-storage if"
                                          " you are not using lvm" % vgstatus)
           self.op.file_storage_dir = os.path.normpath(self.op.file_storage_dir)
           if not os.path.isabs(self.op.file_storage_dir):
             raise errors.OpPrereqError("The file storage directory you have is"
                                        " not an absolute path.")
           if not os.path.exists(self.op.file_storage_dir):
             try:
               os.makedirs(self.op.file_storage_dir, 0750)
             except OSError, err:
               raise errors.OpPrereqError("Cannot create file storage directory"
                                          " '%s': %s" %
                                          (self.op.file_storage_dir, err))
           if not os.path.isdir(self.op.file_storage_dir):
             raise errors.OpPrereqError("The file storage directory '%s' is not"
                                        " a directory." % self.op.file_storage_dir)
           if not re.match("^[0-9a-z]{2}:[0-9a-z]{2}:[0-9a-z]{2}$",
                           self.op.mac_prefix):
             raise errors.OpPrereqError("Invalid mac prefix given '%s'" %
                                        self.op.mac_prefix)
           if self.op.hypervisor_type not in constants.HYPER_TYPES:
             raise errors.OpPrereqError("Invalid hypervisor type given '%s'" %
                                        self.op.hypervisor_type)
           result = utils.RunCmd(["ip", "link", "show", "dev", self.op.master_netdev])
           if result.failed:
             raise errors.OpPrereqError("Invalid master netdev given (%s): '%s'" %
                                        (self.op.master_netdev,
                                         result.output.strip()))
           if not (os.path.isfile(constants.NODE_INITD_SCRIPT) and
                   os.access(constants.NODE_INITD_SCRIPT, os.X_OK)):
             raise errors.OpPrereqError("Init.d script '%s' missing or not"
                                        " executable." % constants.NODE_INITD_SCRIPT)
         def Exec(self, feedback_fn):
           """Initialize the cluster.
           """
           clustername = self.clustername
           hostname = self.hostname
           # set up the simple store
           self.sstore = ss = ssconf.SimpleStore()
           ss.SetKey(ss.SS_HYPERVISOR, self.op.hypervisor_type)
           ss.SetKey(ss.SS_MASTER_NODE, hostname.name)
           ss.SetKey(ss.SS_MASTER_IP, clustername.ip)
           ss.SetKey(ss.SS_MASTER_NETDEV, self.op.master_netdev)
           ss.SetKey(ss.SS_CLUSTER_NAME, clustername.name)
           ss.SetKey(ss.SS_FILE_STORAGE_DIR, self.op.file_storage_dir)
           ss.SetKey(ss.SS_CONFIG_VERSION, constants.CONFIG_VERSION)
           # set up the inter-node password and certificate
           _InitGanetiServerSetup(ss)
           # start the master ip
           rpc.call_node_start_master(hostname.name)
           # set up ssh config and /etc/hosts
           f = open(constants.SSH_HOST_RSA_PUB, 'r')
           try:
             sshline = f.read()
           finally:
             f.close()
           sshkey = sshline.split(" ")[1]
           _AddHostToEtcHosts(hostname.name)
           _InitSSHSetup(hostname.name)
           # init of cluster config file
           self.cfg = cfgw = config.ConfigWriter()
           cfgw.InitConfig(hostname.name, hostname.ip, self.secondary_ip,
                           sshkey, self.op.mac_prefix,
                           self.op.vg_name, self.op.def_bridge)
           ssh.WriteKnownHostsFile(cfgw, ss, constants.SSH_KNOWN_HOSTS_FILE)
       class LUDestroyCluster(NoHooksLU):
         """Logical unit for destroying the cluster.
         """
         _OP_REQP = []
         def CheckPrereq(self):
           """Check prerequisites.
           This checks whether the cluster is empty.
           Any errors are signalled by raising errors.OpPrereqError.
           """
           master = self.sstore.GetMasterNode()
           nodelist = self.cfg.GetNodeList()
           if len(nodelist) != 1 or nodelist[0] != master:
             raise errors.OpPrereqError("There are still %d node(s) in"
                                        " this cluster." % (len(nodelist) - 1))
           instancelist = self.cfg.GetInstanceList()
           if instancelist:
             raise errors.OpPrereqError("There are still %d instance(s) in"
                                        " this cluster." % len(instancelist))
         def Exec(self, feedback_fn):
           """Destroys the cluster.
           """
           master = self.sstore.GetMasterNode()
           if not rpc.call_node_stop_master(master):
             raise errors.OpExecError("Could not disable the master role")
           priv_key, pub_key, _ = ssh.GetUserFiles(constants.GANETI_RUNAS)
           utils.CreateBackup(priv_key)
           utils.CreateBackup(pub_key)
           rpc.call_node_leave_cluster(master)
       class LUVerifyCluster(LogicalUnit):
         """Verifies the cluster status.
         """
         HPATH = "cluster-verify"
         HTYPE = constants.HTYPE_CLUSTER
         _OP_REQP = ["skip_checks"]
         def _VerifyNode(self, node, file_list, local_cksum, vglist, node_result,
                         remote_version, feedback_fn):
           """Run multiple tests against a node.
           Test list:
             - compares ganeti version
             - checks vg existance and size > 20G
             - checks config file checksum
             - checks ssh to other nodes
           Args:
             node: name of the node to check
             file_list: required list of files
             local_cksum: dictionary of local files and their checksums
           """
           # compares ganeti version
           local_version = constants.PROTOCOL_VERSION
           if not remote_version:
             feedback_fn("  - ERROR: connection to %s failed" % (node))
             return True
           if local_version != remote_version:
             feedback_fn("  - ERROR: sw version mismatch: master %s, node(%s) %s" %
                             (local_version, node, remote_version))
             return True
           # checks vg existance and size > 20G
           bad = False
           if not vglist:
             feedback_fn("  - ERROR: unable to check volume groups on node %s." %
                             (node,))
             bad = True
           else:
             vgstatus = _HasValidVG(vglist, self.cfg.GetVGName())
             if vgstatus:
               feedback_fn("  - ERROR: %s on node %s" % (vgstatus, node))
               bad = True
           # checks config file checksum
           # checks ssh to any
           if 'filelist' not in node_result:
             bad = True
             feedback_fn("  - ERROR: node hasn't returned file checksum data")
           else:
             remote_cksum = node_result['filelist']
             for file_name in file_list:
               if file_name not in remote_cksum:
                 bad = True
                 feedback_fn("  - ERROR: file '%s' missing" % file_name)
               elif remote_cksum[file_name] != local_cksum[file_name]:
                 bad = True
                 feedback_fn("  - ERROR: file '%s' has wrong checksum" % file_name)
           if 'nodelist' not in node_result:
             bad = True
             feedback_fn("  - ERROR: node hasn't returned node ssh connectivity data")
           else:
             if node_result['nodelist']:
               bad = True
               for node in node_result['nodelist']:
                 feedback_fn("  - ERROR: ssh communication with node '%s': %s" %
                                 (node, node_result['nodelist'][node]))
           if 'node-net-test' not in node_result:
             bad = True
             feedback_fn("  - ERROR: node hasn't returned node tcp connectivity data")
           else:
             if node_result['node-net-test']:
               bad = True
               nlist = utils.NiceSort(node_result['node-net-test'].keys())
               for node in nlist:
                 feedback_fn("  - ERROR: tcp communication with node '%s': %s" %
                                 (node, node_result['node-net-test'][node]))
           hyp_result = node_result.get('hypervisor', None)
           if hyp_result is not None:
             feedback_fn("  - ERROR: hypervisor verify failure: '%s'" % hyp_result)
           return bad
         def _VerifyInstance(self, instance, instanceconfig, node_vol_is,
                             node_instance, feedback_fn):
           """Verify an instance.
           This function checks to see if the required block devices are
           available on the instance's node.
           """
           bad = False
           node_current = instanceconfig.primary_node
           node_vol_should = {}
           instanceconfig.MapLVsByNode(node_vol_should)
           for node in node_vol_should:
             for volume in node_vol_should[node]:
               if node not in node_vol_is or volume not in node_vol_is[node]:
                 feedback_fn("  - ERROR: volume %s missing on node %s" %
                                 (volume, node))
                 bad = True
           if not instanceconfig.status == 'down':
             if (node_current not in node_instance or
                 not instance in node_instance[node_current]):
               feedback_fn("  - ERROR: instance %s not running on node %s" %
                               (instance, node_current))
               bad = True
           for node in node_instance:
             if (not node == node_current):
               if instance in node_instance[node]:
                 feedback_fn("  - ERROR: instance %s should not run on node %s" %
                                 (instance, node))
                 bad = True
           return bad
         def _VerifyOrphanVolumes(self, node_vol_should, node_vol_is, feedback_fn):
           """Verify if there are any unknown volumes in the cluster.
           The .os, .swap and backup volumes are ignored. All other volumes are
           reported as unknown.
           """
           bad = False
           for node in node_vol_is:
             for volume in node_vol_is[node]:
               if node not in node_vol_should or volume not in node_vol_should[node]:
                 feedback_fn("  - ERROR: volume %s on node %s should not exist" %
                             (volume, node))
                 bad = True
           return bad
         def _VerifyOrphanInstances(self, instancelist, node_instance, feedback_fn):
           """Verify the list of running instances.
           This checks what instances are running but unknown to the cluster.
           """
           bad = False
           for node in node_instance:
             for runninginstance in node_instance[node]:
               if runninginstance not in instancelist:
                 feedback_fn("  - ERROR: instance %s on node %s should not exist" %
                                 (runninginstance, node))
                 bad = True
           return bad
         def _VerifyNPlusOneMemory(self, node_info, instance_cfg, feedback_fn):
           """Verify N+1 Memory Resilience.
           Check that if one single node dies we can still start all the instances it
           was primary for.
           """
           bad = False
           for node, nodeinfo in node_info.iteritems():
             # This code checks that every node which is now listed as secondary has
             # enough memory to host all instances it is supposed to should a single
             # other node in the cluster fail.
             # FIXME: not ready for failover to an arbitrary node
             # FIXME: does not support file-backed instances
             # WARNING: we currently take into account down instances as well as up
             # ones, considering that even if they're down someone might want to start
             # them even in the event of a node failure.
             for prinode, instances in nodeinfo['sinst-by-pnode'].iteritems():
               needed_mem = 0
               for instance in instances:
                 needed_mem += instance_cfg[instance].memory
               if nodeinfo['mfree'] < needed_mem:
                 feedback_fn("  - ERROR: not enough memory on node %s to accomodate"
                             " failovers should node %s fail" % (node, prinode))
                 bad = True
           return bad
         def CheckPrereq(self):
           """Check prerequisites.
           Transform the list of checks we're going to skip into a set and check that
           all its members are valid.
           """
           self.skip_set = frozenset(self.op.skip_checks)
           if not constants.VERIFY_OPTIONAL_CHECKS.issuperset(self.skip_set):
             raise errors.OpPrereqError("Invalid checks to be skipped specified")
         def BuildHooksEnv(self):
           """Build hooks env.
           Cluster-Verify hooks just rone in the post phase and their failure makes
           the output be logged in the verify output and the verification to fail.
           """
           all_nodes = self.cfg.GetNodeList()
           # TODO: populate the environment with useful information for verify hooks
           env = {}
           return env, [], all_nodes
         def Exec(self, feedback_fn):
           """Verify integrity of cluster, performing various test on nodes.
           """
           bad = False
           feedback_fn("* Verifying global settings")
           for msg in self.cfg.VerifyConfig():
             feedback_fn("  - ERROR: %s" % msg)
           vg_name = self.cfg.GetVGName()
           nodelist = utils.NiceSort(self.cfg.GetNodeList())
           nodeinfo = [self.cfg.GetNodeInfo(nname) for nname in nodelist]
           instancelist = utils.NiceSort(self.cfg.GetInstanceList())
           i_non_redundant = [] # Non redundant instances
           node_volume = {}
           node_instance = {}
           node_info = {}
           instance_cfg = {}
           # FIXME: verify OS list
           # do local checksums
           file_names = list(self.sstore.GetFileList())
           file_names.append(constants.SSL_CERT_FILE)
           file_names.append(constants.CLUSTER_CONF_FILE)
           local_checksums = utils.FingerprintFiles(file_names)
           feedback_fn("* Gathering data (%d nodes)" % len(nodelist))
           all_volumeinfo = rpc.call_volume_list(nodelist, vg_name)
           all_instanceinfo = rpc.call_instance_list(nodelist)
           all_vglist = rpc.call_vg_list(nodelist)
           node_verify_param = {
             'filelist': file_names,
             'nodelist': nodelist,
             'hypervisor': None,
             'node-net-test': [(node.name, node.primary_ip, node.secondary_ip)
                               for node in nodeinfo]
+            }
           all_nvinfo = rpc.call_node_verify(nodelist, node_verify_param)
           all_rversion = rpc.call_version(nodelist)
           all_ninfo = rpc.call_node_info(nodelist, self.cfg.GetVGName())
           for node in nodelist:
             feedback_fn("* Verifying node %s" % node)
             result = self._VerifyNode(node, file_names, local_checksums,
                                       all_vglist[node], all_nvinfo[node],
                                       all_rversion[node], feedback_fn)
             bad = bad or result
             # node_volume
             volumeinfo = all_volumeinfo[node]
             if isinstance(volumeinfo, basestring):
               feedback_fn("  - ERROR: LVM problem on node %s: %s" %
                           (node, volumeinfo[-400:].encode('string_escape')))
               bad = True
               node_volume[node] = {}
             elif not isinstance(volumeinfo, dict):
               feedback_fn("  - ERROR: connection to %s failed" % (node,))
               bad = True
               continue
             else:
               node_volume[node] = volumeinfo
             # node_instance
             nodeinstance = all_instanceinfo[node]
             if type(nodeinstance) != list:
               feedback_fn("  - ERROR: connection to %s failed" % (node,))
               bad = True
               continue
             node_instance[node] = nodeinstance
             # node_info
             nodeinfo = all_ninfo[node]
             if not isinstance(nodeinfo, dict):
               feedback_fn("  - ERROR: connection to %s failed" % (node,))
               bad = True
               continue
             try:
               node_info[node] = {
                 "mfree": int(nodeinfo['memory_free']),
                 "dfree": int(nodeinfo['vg_free']),
                 "pinst": [],
                 "sinst": [],
                 # dictionary holding all instances this node is secondary for,
                 # grouped by their primary node. Each key is a cluster node, and each
                 # value is a list of instances which have the key as primary and the
                 # current node as secondary.  this is handy to calculate N+1 memory
                 # availability if you can only failover from a primary to its
                 # secondary.
                 "sinst-by-pnode": {},
+              }
             except ValueError:
               feedback_fn("  - ERROR: invalid value returned from node %s" % (node,))
               bad = True
               continue
           node_vol_should = {}
           for instance in instancelist:
             feedback_fn("* Verifying instance %s" % instance)
             inst_config = self.cfg.GetInstanceInfo(instance)
             result =  self._VerifyInstance(instance, inst_config, node_volume,
                                            node_instance, feedback_fn)
             bad = bad or result
             inst_config.MapLVsByNode(node_vol_should)
             instance_cfg[instance] = inst_config
             pnode = inst_config.primary_node
             if pnode in node_info:
               node_info[pnode]['pinst'].append(instance)
             else:
               feedback_fn("  - ERROR: instance %s, connection to primary node"
                           " %s failed" % (instance, pnode))
               bad = True
             # If the instance is non-redundant we cannot survive losing its primary
             # node, so we are not N+1 compliant. On the other hand we have no disk
             # templates with more than one secondary so that situation is not well
             # supported either.
             # FIXME: does not support file-backed instances
             if len(inst_config.secondary_nodes) == 0:
               i_non_redundant.append(instance)
             elif len(inst_config.secondary_nodes) > 1:
               feedback_fn("  - WARNING: multiple secondaries for instance %s"
                           % instance)
             for snode in inst_config.secondary_nodes:
               if snode in node_info:
                 node_info[snode]['sinst'].append(instance)
                 if pnode not in node_info[snode]['sinst-by-pnode']:
                   node_info[snode]['sinst-by-pnode'][pnode] = []
                 node_info[snode]['sinst-by-pnode'][pnode].append(instance)
               else:
                 feedback_fn("  - ERROR: instance %s, connection to secondary node"
                             " %s failed" % (instance, snode))
           feedback_fn("* Verifying orphan volumes")
           result = self._VerifyOrphanVolumes(node_vol_should, node_volume,
                                              feedback_fn)
           bad = bad or result
           feedback_fn("* Verifying remaining instances")
           result = self._VerifyOrphanInstances(instancelist, node_instance,
                                                feedback_fn)
           bad = bad or result
           if constants.VERIFY_NPLUSONE_MEM not in self.skip_set:
             feedback_fn("* Verifying N+1 Memory redundancy")
             result = self._VerifyNPlusOneMemory(node_info, instance_cfg, feedback_fn)
             bad = bad or result
           feedback_fn("* Other Notes")
           if i_non_redundant:
             feedback_fn("  - NOTICE: %d non-redundant instance(s) found."
                         % len(i_non_redundant))
           return int(bad)
         def HooksCallBack(self, phase, hooks_results, feedback_fn, lu_result):
           """Analize the post-hooks' result, handle it, and send some
           nicely-formatted feedback back to the user.
           Args:
             phase: the hooks phase that has just been run
             hooks_results: the results of the multi-node hooks rpc call
             feedback_fn: function to send feedback back to the caller
             lu_result: previous Exec result
           """
           # We only really run POST phase hooks, and are only interested in their results
           if phase == constants.HOOKS_PHASE_POST:
             # Used to change hooks' output to proper indentation
             indent_re = re.compile('^', re.M)
             feedback_fn("* Hooks Results")
             if not hooks_results:
               feedback_fn("  - ERROR: general communication failure")
               lu_result = 1
             else:
               for node_name in hooks_results:
                 show_node_header = True
                 res = hooks_results[node_name]
                 if res is False or not isinstance(res, list):
                   feedback_fn("    Communication failure")
                   lu_result = 1
                   continue
                 for script, hkr, output in res:
                   if hkr == constants.HKR_FAIL:
                     # The node header is only shown once, if there are
                     # failing hooks on that node
                     if show_node_header:
                       feedback_fn("  Node %s:" % node_name)
                       show_node_header = False
                     feedback_fn("    ERROR: Script %s failed, output:" % script)
                     output = indent_re.sub('      ', output)
                     feedback_fn("%s" % output)
                     lu_result = 1
             return lu_result
       class LUVerifyDisks(NoHooksLU):
         """Verifies the cluster disks status.
         """
         _OP_REQP = []
         def CheckPrereq(self):
           """Check prerequisites.
           This has no prerequisites.
           """
           pass
         def Exec(self, feedback_fn):
           """Verify integrity of cluster disks.
           """
           result = res_nodes, res_nlvm, res_instances, res_missing = [], {}, [], {}
           vg_name = self.cfg.GetVGName()
           nodes = utils.NiceSort(self.cfg.GetNodeList())
           instances = [self.cfg.GetInstanceInfo(name)
                        for name in self.cfg.GetInstanceList()]
           nv_dict = {}
           for inst in instances:
             inst_lvs = {}
             if (inst.status != "up" or
                 inst.disk_template not in constants.DTS_NET_MIRROR):
               continue
             inst.MapLVsByNode(inst_lvs)
             # transform { iname: {node: [vol,],},} to {(node, vol): iname}
             for node, vol_list in inst_lvs.iteritems():
               for vol in vol_list:
                 nv_dict[(node, vol)] = inst
           if not nv_dict:
             return result
           node_lvs = rpc.call_volume_list(nodes, vg_name)
           to_act = set()
           for node in nodes:
             # node_volume
             lvs = node_lvs[node]
             if isinstance(lvs, basestring):
               logger.Info("error enumerating LVs on node %s: %s" % (node, lvs))
               res_nlvm[node] = lvs
             elif not isinstance(lvs, dict):
               logger.Info("connection to node %s failed or invalid data returned" %
                           (node,))
               res_nodes.append(node)
               continue
             for lv_name, (_, lv_inactive, lv_online) in lvs.iteritems():
               inst = nv_dict.pop((node, lv_name), None)
               if (not lv_online and inst is not None
                   and inst.name not in res_instances):
                 res_instances.append(inst.name)
           # any leftover items in nv_dict are missing LVs, let's arrange the
           # data better
           for key, inst in nv_dict.iteritems():
             if inst.name not in res_missing:
               res_missing[inst.name] = []
             res_missing[inst.name].append(key)
           return result
       class LURenameCluster(LogicalUnit):
         """Rename the cluster.
         """
         HPATH = "cluster-rename"
         HTYPE = constants.HTYPE_CLUSTER
         _OP_REQP = ["name"]
         def BuildHooksEnv(self):
           """Build hooks env.
           """
           env = {
             "OP_TARGET": self.sstore.GetClusterName(),
             "NEW_NAME": self.op.name,
+            }
           mn = self.sstore.GetMasterNode()
           return env, [mn], [mn]
         def CheckPrereq(self):
           """Verify that the passed name is a valid one.
           """
           hostname = utils.HostInfo(self.op.name)
           new_name = hostname.name
           self.ip = new_ip = hostname.ip
           old_name = self.sstore.GetClusterName()
           old_ip = self.sstore.GetMasterIP()
           if new_name == old_name and new_ip == old_ip:
             raise errors.OpPrereqError("Neither the name nor the IP address of the"
                                        " cluster has changed")
           if new_ip != old_ip:
             result = utils.RunCmd(["fping", "-q", new_ip])
             if not result.failed:
               raise errors.OpPrereqError("The given cluster IP address (%s) is"
                                          " reachable on the network. Aborting." %
                                          new_ip)
           self.op.name = new_name
         def Exec(self, feedback_fn):
           """Rename the cluster.
           """
           clustername = self.op.name
           ip = self.ip
           ss = self.sstore
           # shutdown the master IP
           master = ss.GetMasterNode()
           if not rpc.call_node_stop_master(master):
             raise errors.OpExecError("Could not disable the master role")
           try:
             # modify the sstore
             ss.SetKey(ss.SS_MASTER_IP, ip)
             ss.SetKey(ss.SS_CLUSTER_NAME, clustername)
             # Distribute updated ss config to all nodes
             myself = self.cfg.GetNodeInfo(master)
             dist_nodes = self.cfg.GetNodeList()
             if myself.name in dist_nodes:
               dist_nodes.remove(myself.name)
             logger.Debug("Copying updated ssconf data to all nodes")
             for keyname in [ss.SS_CLUSTER_NAME, ss.SS_MASTER_IP]:
               fname = ss.KeyToFilename(keyname)
               result = rpc.call_upload_file(dist_nodes, fname)
               for to_node in dist_nodes:
                 if not result[to_node]:
                   logger.Error("copy of file %s to node %s failed" %
                                (fname, to_node))
           finally:
             if not rpc.call_node_start_master(master):
               logger.Error("Could not re-enable the master role on the master,"
                            " please restart manually.")
       def _RecursiveCheckIfLVMBased(disk):
         """Check if the given disk or its children are lvm-based.
         Args:
           disk: ganeti.objects.Disk object
         Returns:
           boolean indicating whether a LD_LV dev_type was found or not
         """
         if disk.children:
           for chdisk in disk.children:
             if _RecursiveCheckIfLVMBased(chdisk):
               return True
         return disk.dev_type == constants.LD_LV
       class LUSetClusterParams(LogicalUnit):
         """Change the parameters of the cluster.
         """
         HPATH = "cluster-modify"
         HTYPE = constants.HTYPE_CLUSTER
         _OP_REQP = []
         def BuildHooksEnv(self):
           """Build hooks env.
           """
           env = {
             "OP_TARGET": self.sstore.GetClusterName(),
             "NEW_VG_NAME": self.op.vg_name,
+            }
           mn = self.sstore.GetMasterNode()
           return env, [mn], [mn]
         def CheckPrereq(self):
           """Check prerequisites.
           This checks whether the given params don't conflict and
           if the given volume group is valid.
           """
           if not self.op.vg_name:
             instances = [self.cfg.GetInstanceInfo(name)
                          for name in self.cfg.GetInstanceList()]
             for inst in instances:
               for disk in inst.disks:
                 if _RecursiveCheckIfLVMBased(disk):
                   raise errors.OpPrereqError("Cannot disable lvm storage while"
                                              " lvm-based instances exist")
           # if vg_name not None, checks given volume group on all nodes
           if self.op.vg_name:
             node_list = self.cfg.GetNodeList()
             vglist = rpc.call_vg_list(node_list)
             for node in node_list:
               vgstatus = _HasValidVG(vglist[node], self.op.vg_name)
               if vgstatus:
                 raise errors.OpPrereqError("Error on node '%s': %s" %
                                            (node, vgstatus))
         def Exec(self, feedback_fn):
           """Change the parameters of the cluster.
           """
           if self.op.vg_name != self.cfg.GetVGName():
             self.cfg.SetVGName(self.op.vg_name)
           else:
             feedback_fn("Cluster LVM configuration already in desired"
                         " state, not changing")
       def _WaitForSync(cfgw, instance, proc, oneshot=False, unlock=False):
         """Sleep and poll for an instance's disk to sync.
         """
         if not instance.disks:
           return True
         if not oneshot:
           proc.LogInfo("Waiting for instance %s to sync disks." % instance.name)
         node = instance.primary_node
         for dev in instance.disks:
           cfgw.SetDiskID(dev, node)
         retries = 0
         while True:
           max_time = 0
           done = True
           cumul_degraded = False
           rstats = rpc.call_blockdev_getmirrorstatus(node, instance.disks)
           if not rstats:
             proc.LogWarning("Can't get any data from node %s" % node)
             retries += 1
             if retries >= 10:
               raise errors.RemoteError("Can't contact node %s for mirror data,"
                                        " aborting." % node)
             time.sleep(6)
             continue
           retries = 0
           for i in range(len(rstats)):
             mstat = rstats[i]
             if mstat is None:
               proc.LogWarning("Can't compute data for node %s/%s" %
                               (node, instance.disks[i].iv_name))
               continue
             # we ignore the ldisk parameter
             perc_done, est_time, is_degraded, _ = mstat
             cumul_degraded = cumul_degraded or (is_degraded and perc_done is None)
             if perc_done is not None:
               done = False
               if est_time is not None:
                 rem_time = "%d estimated seconds remaining" % est_time
                 max_time = est_time
               else:
                 rem_time = "no time estimate"
               proc.LogInfo("- device %s: %5.2f%% done, %s" %
                            (instance.disks[i].iv_name, perc_done, rem_time))
           if done or oneshot:
             break
           if unlock:
             #utils.Unlock('cmd')
             pass
           try:
             time.sleep(min(60, max_time))
           finally:
             if unlock:
               #utils.Lock('cmd')
               pass
         if done:
           proc.LogInfo("Instance %s's disks are in sync." % instance.name)
         return not cumul_degraded
       def _CheckDiskConsistency(cfgw, dev, node, on_primary, ldisk=False):
         """Check that mirrors are not degraded.
         The ldisk parameter, if True, will change the test from the
         is_degraded attribute (which represents overall non-ok status for
         the device(s)) to the ldisk (representing the local storage status).
         """
         cfgw.SetDiskID(dev, node)
         if ldisk:
           idx = 6
         else:
           idx = 5
         result = True
         if on_primary or dev.AssembleOnSecondary():
           rstats = rpc.call_blockdev_find(node, dev)
           if not rstats:
             logger.ToStderr("Node %s: Disk degraded, not found or node down" % node)
             result = False
           else:
             result = result and (not rstats[idx])
         if dev.children:
           for child in dev.children:
             result = result and _CheckDiskConsistency(cfgw, child, node, on_primary)
         return result
       class LUDiagnoseOS(NoHooksLU):
         """Logical unit for OS diagnose/query.
         """
         _OP_REQP = ["output_fields", "names"]
         def CheckPrereq(self):
           """Check prerequisites.
           This always succeeds, since this is a pure query LU.
           """
           if self.op.names:
             raise errors.OpPrereqError("Selective OS query not supported")
           self.dynamic_fields = frozenset(["name", "valid", "node_status"])
           _CheckOutputFields(static=[],
                              dynamic=self.dynamic_fields,
                              selected=self.op.output_fields)
         @staticmethod
         def _DiagnoseByOS(node_list, rlist):
           """Remaps a per-node return list into an a per-os per-node dictionary
             Args:
               node_list: a list with the names of all nodes
               rlist: a map with node names as keys and OS objects as values
             Returns:
               map: a map with osnames as keys and as value another map, with
                    nodes as
                    keys and list of OS objects as values
                    e.g. {"debian-etch": {"node1": [<object>,...],
                                          "node2": [<object>,]}
+                        }
           """
           all_os = {}
           for node_name, nr in rlist.iteritems():
             if not nr:
               continue
             for os_obj in nr:
               if os_obj.name not in all_os:
                 # build a list of nodes for this os containing empty lists
                 # for each node in node_list
                 all_os[os_obj.name] = {}
                 for nname in node_list:
                   all_os[os_obj.name][nname] = []
               all_os[os_obj.name][node_name].append(os_obj)
           return all_os
         def Exec(self, feedback_fn):
           """Compute the list of OSes.
           """
           node_list = self.cfg.GetNodeList()
           node_data = rpc.call_os_diagnose(node_list)
           if node_data == False:
             raise errors.OpExecError("Can't gather the list of OSes")
           pol = self._DiagnoseByOS(node_list, node_data)
           output = []
           for os_name, os_data in pol.iteritems():
             row = []
             for field in self.op.output_fields:
               if field == "name":
                 val = os_name
               elif field == "valid":
                 val = utils.all([osl and osl[0] for osl in os_data.values()])
               elif field == "node_status":
                 val = {}
                 for node_name, nos_list in os_data.iteritems():
                   val[node_name] = [(v.status, v.path) for v in nos_list]
               else:
                 raise errors.ParameterError(field)
               row.append(val)
             output.append(row)
           return output
       class LURemoveNode(LogicalUnit):
         """Logical unit for removing a node.
         """
         HPATH = "node-remove"
         HTYPE = constants.HTYPE_NODE
         _OP_REQP = ["node_name"]
         def BuildHooksEnv(self):
           """Build hooks env.
           This doesn't run on the target node in the pre phase as a failed
           node would not allows itself to run.
           """
           env = {
             "OP_TARGET": self.op.node_name,
             "NODE_NAME": self.op.node_name,
+            }
           all_nodes = self.cfg.GetNodeList()
           all_nodes.remove(self.op.node_name)
           return env, all_nodes, all_nodes
         def CheckPrereq(self):
           """Check prerequisites.
           This checks:
            - the node exists in the configuration
            - it does not have primary or secondary instances
            - it's not the master
           Any errors are signalled by raising errors.OpPrereqError.
           """
           node = self.cfg.GetNodeInfo(self.cfg.ExpandNodeName(self.op.node_name))
           if node is None:
             raise errors.OpPrereqError, ("Node '%s' is unknown." % self.op.node_name)
           instance_list = self.cfg.GetInstanceList()
           masternode = self.sstore.GetMasterNode()
           if node.name == masternode:
             raise errors.OpPrereqError("Node is the master node,"
                                        " you need to failover first.")
           for instance_name in instance_list:
             instance = self.cfg.GetInstanceInfo(instance_name)
             if node.name == instance.primary_node:
               raise errors.OpPrereqError("Instance %s still running on the node,"
                                          " please remove first." % instance_name)
             if node.name in instance.secondary_nodes:
               raise errors.OpPrereqError("Instance %s has node as a secondary,"
                                          " please remove first." % instance_name)
           self.op.node_name = node.name
           self.node = node
         def Exec(self, feedback_fn):
           """Removes the node from the cluster.
           """
           node = self.node
           logger.Info("stopping the node daemon and removing configs from node %s" %
                       node.name)
           rpc.call_node_leave_cluster(node.name)
           self.ssh.Run(node.name, 'root', "%s stop" % constants.NODE_INITD_SCRIPT)
           logger.Info("Removing node %s from config" % node.name)
           self.cfg.RemoveNode(node.name)
           _RemoveHostFromEtcHosts(node.name)
       class LUQueryNodes(NoHooksLU):
         """Logical unit for querying nodes.
         """
         _OP_REQP = ["output_fields", "names"]
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the fields required are valid output fields.
           """
           self.dynamic_fields = frozenset([
             "dtotal", "dfree",
             "mtotal", "mnode", "mfree",
             "bootid",
             "ctotal",
             ])
           _CheckOutputFields(static=["name", "pinst_cnt", "sinst_cnt",
                                      "pinst_list", "sinst_list",
                                      "pip", "sip"],
                              dynamic=self.dynamic_fields,
                              selected=self.op.output_fields)
           self.wanted = _GetWantedNodes(self, self.op.names)
         def Exec(self, feedback_fn):
           """Computes the list of nodes and their attributes.
           """
           nodenames = self.wanted
           nodelist = [self.cfg.GetNodeInfo(name) for name in nodenames]
           # begin data gathering
           if self.dynamic_fields.intersection(self.op.output_fields):
             live_data = {}
             node_data = rpc.call_node_info(nodenames, self.cfg.GetVGName())
             for name in nodenames:
               nodeinfo = node_data.get(name, None)
               if nodeinfo:
                 live_data[name] = {
                   "mtotal": utils.TryConvert(int, nodeinfo['memory_total']),
                   "mnode": utils.TryConvert(int, nodeinfo['memory_dom0']),
                   "mfree": utils.TryConvert(int, nodeinfo['memory_free']),
                   "dtotal": utils.TryConvert(int, nodeinfo['vg_size']),
                   "dfree": utils.TryConvert(int, nodeinfo['vg_free']),
                   "ctotal": utils.TryConvert(int, nodeinfo['cpu_total']),
                   "bootid": nodeinfo['bootid'],
+                  }
               else:
                 live_data[name] = {}
           else:
             live_data = dict.fromkeys(nodenames, {})
           node_to_primary = dict([(name, set()) for name in nodenames])
           node_to_secondary = dict([(name, set()) for name in nodenames])
           inst_fields = frozenset(("pinst_cnt", "pinst_list",
                                    "sinst_cnt", "sinst_list"))
           if inst_fields & frozenset(self.op.output_fields):
             instancelist = self.cfg.GetInstanceList()
             for instance_name in instancelist:
               inst = self.cfg.GetInstanceInfo(instance_name)
               if inst.primary_node in node_to_primary:
                 node_to_primary[inst.primary_node].add(inst.name)
               for secnode in inst.secondary_nodes:
                 if secnode in node_to_secondary:
                   node_to_secondary[secnode].add(inst.name)
           # end data gathering
           output = []
           for node in nodelist:
             node_output = []
             for field in self.op.output_fields:
               if field == "name":
                 val = node.name
               elif field == "pinst_list":
                 val = list(node_to_primary[node.name])
               elif field == "sinst_list":
                 val = list(node_to_secondary[node.name])
               elif field == "pinst_cnt":
                 val = len(node_to_primary[node.name])
               elif field == "sinst_cnt":
                 val = len(node_to_secondary[node.name])
               elif field == "pip":
                 val = node.primary_ip
               elif field == "sip":
                 val = node.secondary_ip
               elif field in self.dynamic_fields:
                 val = live_data[node.name].get(field, None)
               else:
                 raise errors.ParameterError(field)
               node_output.append(val)
             output.append(node_output)
           return output
       class LUQueryNodeVolumes(NoHooksLU):
         """Logical unit for getting volumes on node(s).
         """
         _OP_REQP = ["nodes", "output_fields"]
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the fields required are valid output fields.
           """
           self.nodes = _GetWantedNodes(self, self.op.nodes)
           _CheckOutputFields(static=["node"],
                              dynamic=["phys", "vg", "name", "size", "instance"],
                              selected=self.op.output_fields)
         def Exec(self, feedback_fn):
           """Computes the list of nodes and their attributes.
           """
           nodenames = self.nodes
           volumes = rpc.call_node_volumes(nodenames)
           ilist = [self.cfg.GetInstanceInfo(iname) for iname
                    in self.cfg.GetInstanceList()]
           lv_by_node = dict([(inst, inst.MapLVsByNode()) for inst in ilist])
           output = []
           for node in nodenames:
             if node not in volumes or not volumes[node]:
               continue
             node_vols = volumes[node][:]
             node_vols.sort(key=lambda vol: vol['dev'])
             for vol in node_vols:
               node_output = []
               for field in self.op.output_fields:
                 if field == "node":
                   val = node
                 elif field == "phys":
                   val = vol['dev']
                 elif field == "vg":
                   val = vol['vg']
                 elif field == "name":
                   val = vol['name']
                 elif field == "size":
                   val = int(float(vol['size']))
                 elif field == "instance":
                   for inst in ilist:
                     if node not in lv_by_node[inst]:
                       continue
                     if vol['name'] in lv_by_node[inst][node]:
                       val = inst.name
                       break
                   else:
                     val = '-'
                 else:
                   raise errors.ParameterError(field)
                 node_output.append(str(val))
               output.append(node_output)
           return output
       class LUAddNode(LogicalUnit):
         """Logical unit for adding node to the cluster.
         """
         HPATH = "node-add"
         HTYPE = constants.HTYPE_NODE
         _OP_REQP = ["node_name"]
         def BuildHooksEnv(self):
           """Build hooks env.
           This will run on all nodes before, and on all nodes + the new node after.
           """
           env = {
             "OP_TARGET": self.op.node_name,
             "NODE_NAME": self.op.node_name,
             "NODE_PIP": self.op.primary_ip,
             "NODE_SIP": self.op.secondary_ip,
+            }
           nodes_0 = self.cfg.GetNodeList()
           nodes_1 = nodes_0 + [self.op.node_name, ]
           return env, nodes_0, nodes_1
         def CheckPrereq(self):
           """Check prerequisites.
           This checks:
            - the new node is not already in the config
            - it is resolvable
            - its parameters (single/dual homed) matches the cluster
           Any errors are signalled by raising errors.OpPrereqError.
           """
           node_name = self.op.node_name
           cfg = self.cfg
           dns_data = utils.HostInfo(node_name)
           node = dns_data.name
           primary_ip = self.op.primary_ip = dns_data.ip
           secondary_ip = getattr(self.op, "secondary_ip", None)
           if secondary_ip is None:
             secondary_ip = primary_ip
           if not utils.IsValidIP(secondary_ip):
             raise errors.OpPrereqError("Invalid secondary IP given")
           self.op.secondary_ip = secondary_ip
           node_list = cfg.GetNodeList()
           if not self.op.readd and node in node_list:
             raise errors.OpPrereqError("Node %s is already in the configuration" %
                                        node)
           elif self.op.readd and node not in node_list:
             raise errors.OpPrereqError("Node %s is not in the configuration" % node)
           for existing_node_name in node_list:
             existing_node = cfg.GetNodeInfo(existing_node_name)
             if self.op.readd and node == existing_node_name:
               if (existing_node.primary_ip != primary_ip or
                   existing_node.secondary_ip != secondary_ip):
                 raise errors.OpPrereqError("Readded node doesn't have the same IP"
                                            " address configuration as before")
               continue
             if (existing_node.primary_ip == primary_ip or
                 existing_node.secondary_ip == primary_ip or
                 existing_node.primary_ip == secondary_ip or
                 existing_node.secondary_ip == secondary_ip):
               raise errors.OpPrereqError("New node ip address(es) conflict with"
                                          " existing node %s" % existing_node.name)
           # check that the type of the node (single versus dual homed) is the
           # same as for the master
           myself = cfg.GetNodeInfo(self.sstore.GetMasterNode())
           master_singlehomed = myself.secondary_ip == myself.primary_ip
           newbie_singlehomed = secondary_ip == primary_ip
           if master_singlehomed != newbie_singlehomed:
             if master_singlehomed:
               raise errors.OpPrereqError("The master has no private ip but the"
                                          " new node has one")
             else:
               raise errors.OpPrereqError("The master has a private ip but the"
                                          " new node doesn't have one")
           # checks reachablity
           if not utils.TcpPing(primary_ip, constants.DEFAULT_NODED_PORT):
             raise errors.OpPrereqError("Node not reachable by ping")
           if not newbie_singlehomed:
             # check reachability from my secondary ip to newbie's secondary ip
             if not utils.TcpPing(secondary_ip, constants.DEFAULT_NODED_PORT,
                                  source=myself.secondary_ip):
               raise errors.OpPrereqError("Node secondary ip not reachable by TCP"
                                          " based ping to noded port")
           self.new_node = objects.Node(name=node,
                                        primary_ip=primary_ip,
                                        secondary_ip=secondary_ip)
           if self.sstore.GetHypervisorType() == constants.HT_XEN_HVM31:
             if not os.path.exists(constants.VNC_PASSWORD_FILE):
               raise errors.OpPrereqError("Cluster VNC password file %s missing" %
                                          constants.VNC_PASSWORD_FILE)
         def Exec(self, feedback_fn):
           """Adds the new node to the cluster.
           """
           new_node = self.new_node
           node = new_node.name
           # set up inter-node password and certificate and restarts the node daemon
           gntpass = self.sstore.GetNodeDaemonPassword()
           if not re.match('^[a-zA-Z0-9.]{1,64}$', gntpass):
             raise errors.OpExecError("ganeti password corruption detected")
           f = open(constants.SSL_CERT_FILE)
           try:
             gntpem = f.read(8192)
           finally:
             f.close()
           # in the base64 pem encoding, neither '!' nor '.' are valid chars,
           # so we use this to detect an invalid certificate; as long as the
           # cert doesn't contain this, the here-document will be correctly
           # parsed by the shell sequence below
           if re.search('^!EOF\.', gntpem, re.MULTILINE):
             raise errors.OpExecError("invalid PEM encoding in the SSL certificate")
           if not gntpem.endswith("\n"):
             raise errors.OpExecError("PEM must end with newline")
           logger.Info("copy cluster pass to %s and starting the node daemon" % node)
           # and then connect with ssh to set password and start ganeti-noded
           # note that all the below variables are sanitized at this point,
           # either by being constants or by the checks above
           ss = self.sstore
           mycommand = ("umask 077 && "
                        "echo '%s' > '%s' && "
                        "cat > '%s' << '!EOF.' && \n"
                        "%s!EOF.\n%s restart" %
                        (gntpass, ss.KeyToFilename(ss.SS_NODED_PASS),
                         constants.SSL_CERT_FILE, gntpem,
                         constants.NODE_INITD_SCRIPT))
           result = self.ssh.Run(node, 'root', mycommand, batch=False, ask_key=True)
           if result.failed:
             raise errors.OpExecError("Remote command on node %s, error: %s,"
                                      " output: %s" %
                                      (node, result.fail_reason, result.output))
           # check connectivity
           time.sleep(4)
           result = rpc.call_version([node])[node]
           if result:
             if constants.PROTOCOL_VERSION == result:
               logger.Info("communication to node %s fine, sw version %s match" %
                           (node, result))
             else:
               raise errors.OpExecError("Version mismatch master version %s,"
                                        " node version %s" %
                                        (constants.PROTOCOL_VERSION, result))
           else:
             raise errors.OpExecError("Cannot get version from the new node")
           # setup ssh on node
           logger.Info("copy ssh key to node %s" % node)
           priv_key, pub_key, _ = ssh.GetUserFiles(constants.GANETI_RUNAS)
           keyarray = []
           keyfiles = [constants.SSH_HOST_DSA_PRIV, constants.SSH_HOST_DSA_PUB,
                       constants.SSH_HOST_RSA_PRIV, constants.SSH_HOST_RSA_PUB,
                       priv_key, pub_key]
           for i in keyfiles:
             f = open(i, 'r')
             try:
               keyarray.append(f.read())
             finally:
               f.close()
           result = rpc.call_node_add(node, keyarray[0], keyarray[1], keyarray[2],
                                      keyarray[3], keyarray[4], keyarray[5])
           if not result:
             raise errors.OpExecError("Cannot transfer ssh keys to the new node")
           # Add node to our /etc/hosts, and add key to known_hosts
           _AddHostToEtcHosts(new_node.name)
           if new_node.secondary_ip != new_node.primary_ip:
             if not rpc.call_node_tcp_ping(new_node.name,
                                           constants.LOCALHOST_IP_ADDRESS,
                                           new_node.secondary_ip,
                                           constants.DEFAULT_NODED_PORT,
 , False):
               raise errors.OpExecError("Node claims it doesn't have the secondary ip"
                                        " you gave (%s). Please fix and re-run this"
                                        " command." % new_node.secondary_ip)
           success, msg = self.ssh.VerifyNodeHostname(node)
           if not success:
             raise errors.OpExecError("Node '%s' claims it has a different hostname"
                                      " than the one the resolver gives: %s."
                                      " Please fix and re-run this command." %
                                      (node, msg))
           # Distribute updated /etc/hosts and known_hosts to all nodes,
           # including the node just added
           myself = self.cfg.GetNodeInfo(self.sstore.GetMasterNode())
           dist_nodes = self.cfg.GetNodeList()
           if not self.op.readd:
             dist_nodes.append(node)
           if myself.name in dist_nodes:
             dist_nodes.remove(myself.name)
           logger.Debug("Copying hosts and known_hosts to all nodes")
           for fname in (constants.ETC_HOSTS, constants.SSH_KNOWN_HOSTS_FILE):
             result = rpc.call_upload_file(dist_nodes, fname)
             for to_node in dist_nodes:
               if not result[to_node]:
                 logger.Error("copy of file %s to node %s failed" %
                              (fname, to_node))
           to_copy = ss.GetFileList()
           if self.sstore.GetHypervisorType() == constants.HT_XEN_HVM31:
             to_copy.append(constants.VNC_PASSWORD_FILE)
           for fname in to_copy:
             if not self.ssh.CopyFileToNode(node, fname):
               logger.Error("could not copy file %s to node %s" % (fname, node))
           if not self.op.readd:
             logger.Info("adding node %s to cluster.conf" % node)
             self.cfg.AddNode(new_node)
       class LUMasterFailover(LogicalUnit):
         """Failover the master node to the current node.
         This is a special LU in that it must run on a non-master node.
         """
         HPATH = "master-failover"
         HTYPE = constants.HTYPE_CLUSTER
         REQ_MASTER = False
         _OP_REQP = []
         def BuildHooksEnv(self):
           """Build hooks env.
           This will run on the new master only in the pre phase, and on all
           the nodes in the post phase.
           """
           env = {
             "OP_TARGET": self.new_master,
             "NEW_MASTER": self.new_master,
             "OLD_MASTER": self.old_master,
+            }
           return env, [self.new_master], self.cfg.GetNodeList()
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that we are not already the master.
           """
           self.new_master = utils.HostInfo().name
           self.old_master = self.sstore.GetMasterNode()
           if self.old_master == self.new_master:
             raise errors.OpPrereqError("This commands must be run on the node"
                                        " where you want the new master to be."
                                        " %s is already the master" %
                                        self.old_master)
         def Exec(self, feedback_fn):
           """Failover the master node.
           This command, when run on a non-master node, will cause the current
           master to cease being master, and the non-master to become new
           master.
           """
           #TODO: do not rely on gethostname returning the FQDN
           logger.Info("setting master to %s, old master: %s" %
                       (self.new_master, self.old_master))
           if not rpc.call_node_stop_master(self.old_master):
             logger.Error("could disable the master role on the old master"
                          " %s, please disable manually" % self.old_master)
           ss = self.sstore
           ss.SetKey(ss.SS_MASTER_NODE, self.new_master)
           if not rpc.call_upload_file(self.cfg.GetNodeList(),
                                       ss.KeyToFilename(ss.SS_MASTER_NODE)):
             logger.Error("could not distribute the new simple store master file"
                          " to the other nodes, please check.")
           if not rpc.call_node_start_master(self.new_master):
             logger.Error("could not start the master role on the new master"
                          " %s, please check" % self.new_master)
             feedback_fn("Error in activating the master IP on the new master,"
                         " please fix manually.")
       class LUQueryClusterInfo(NoHooksLU):
         """Query cluster configuration.
         """
         _OP_REQP = []
         REQ_MASTER = False
         def CheckPrereq(self):
           """No prerequsites needed for this LU.
           """
           pass
         def Exec(self, feedback_fn):
           """Return cluster config.
           """
           result = {
             "name": self.sstore.GetClusterName(),
             "software_version": constants.RELEASE_VERSION,
             "protocol_version": constants.PROTOCOL_VERSION,
             "config_version": constants.CONFIG_VERSION,
             "os_api_version": constants.OS_API_VERSION,
             "export_version": constants.EXPORT_VERSION,
             "master": self.sstore.GetMasterNode(),
             "architecture": (platform.architecture()[0], platform.machine()),
             "hypervisor_type": self.sstore.GetHypervisorType(),
+            }
           return result
       class LUClusterCopyFile(NoHooksLU):
         """Copy file to cluster.
         """
         _OP_REQP = ["nodes", "filename"]
         def CheckPrereq(self):
           """Check prerequisites.
           It should check that the named file exists and that the given list
           of nodes is valid.
           """
           if not os.path.exists(self.op.filename):
             raise errors.OpPrereqError("No such filename '%s'" % self.op.filename)
           self.nodes = _GetWantedNodes(self, self.op.nodes)
         def Exec(self, feedback_fn):
           """Copy a file from master to some nodes.
           Args:
             opts - class with options as members
             args - list containing a single element, the file name
           Opts used:
             nodes - list containing the name of target nodes; if empty, all nodes
           """
           filename = self.op.filename
           myname = utils.HostInfo().name
           for node in self.nodes:
             if node == myname:
               continue
             if not self.ssh.CopyFileToNode(node, filename):
               logger.Error("Copy of file %s to node %s failed" % (filename, node))
       class LUDumpClusterConfig(NoHooksLU):
         """Return a text-representation of the cluster-config.
         """
         _OP_REQP = []
         def CheckPrereq(self):
           """No prerequisites.
           """
           pass
         def Exec(self, feedback_fn):
           """Dump a representation of the cluster config to the standard output.
           """
           return self.cfg.DumpConfig()
       class LURunClusterCommand(NoHooksLU):
         """Run a command on some nodes.
         """
         _OP_REQP = ["command", "nodes"]
         def CheckPrereq(self):
           """Check prerequisites.
           It checks that the given list of nodes is valid.
           """
           self.nodes = _GetWantedNodes(self, self.op.nodes)
         def Exec(self, feedback_fn):
           """Run a command on some nodes.
           """
           # put the master at the end of the nodes list
           master_node = self.sstore.GetMasterNode()
           if master_node in self.nodes:
             self.nodes.remove(master_node)
             self.nodes.append(master_node)
           data = []
           for node in self.nodes:
             result = self.ssh.Run(node, "root", self.op.command)
             data.append((node, result.output, result.exit_code))
           return data
       class LUActivateInstanceDisks(NoHooksLU):
         """Bring up an instance's disks.
         """
         _OP_REQP = ["instance_name"]
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the instance is in the cluster.
           """
           instance = self.cfg.GetInstanceInfo(
             self.cfg.ExpandInstanceName(self.op.instance_name))
           if instance is None:
             raise errors.OpPrereqError("Instance '%s' not known" %
                                        self.op.instance_name)
           self.instance = instance
         def Exec(self, feedback_fn):
           """Activate the disks.
           """
           disks_ok, disks_info = _AssembleInstanceDisks(self.instance, self.cfg)
           if not disks_ok:
             raise errors.OpExecError("Cannot activate block devices")
           return disks_info
       def _AssembleInstanceDisks(instance, cfg, ignore_secondaries=False):
         """Prepare the block devices for an instance.
         This sets up the block devices on all nodes.
         Args:
           instance: a ganeti.objects.Instance object
           ignore_secondaries: if true, errors on secondary nodes won't result
                               in an error return from the function
         Returns:
           false if the operation failed
           list of (host, instance_visible_name, node_visible_name) if the operation
                suceeded with the mapping from node devices to instance devices
         """
         device_info = []
         disks_ok = True
         iname = instance.name
         # With the two passes mechanism we try to reduce the window of
         # opportunity for the race condition of switching DRBD to primary
         # before handshaking occured, but we do not eliminate it
         # The proper fix would be to wait (with some limits) until the
         # connection has been made and drbd transitions from WFConnection
         # into any other network-connected state (Connected, SyncTarget,
         # SyncSource, etc.)
         # 1st pass, assemble on all nodes in secondary mode
         for inst_disk in instance.disks:
           for node, node_disk in inst_disk.ComputeNodeTree(instance.primary_node):
             cfg.SetDiskID(node_disk, node)
             result = rpc.call_blockdev_assemble(node, node_disk, iname, False)
             if not result:
               logger.Error("could not prepare block device %s on node %s"
                            " (is_primary=False, pass=1)" % (inst_disk.iv_name, node))
               if not ignore_secondaries:
                 disks_ok = False
         # FIXME: race condition on drbd migration to primary
         # 2nd pass, do only the primary node
         for inst_disk in instance.disks:
           for node, node_disk in inst_disk.ComputeNodeTree(instance.primary_node):
             if node != instance.primary_node:
               continue
             cfg.SetDiskID(node_disk, node)
             result = rpc.call_blockdev_assemble(node, node_disk, iname, True)
             if not result:
               logger.Error("could not prepare block device %s on node %s"
                            " (is_primary=True, pass=2)" % (inst_disk.iv_name, node))
               disks_ok = False
           device_info.append((instance.primary_node, inst_disk.iv_name, result))
         # leave the disks configured for the primary node
         # this is a workaround that would be fixed better by
         # improving the logical/physical id handling
         for disk in instance.disks:
           cfg.SetDiskID(disk, instance.primary_node)
         return disks_ok, device_info
       def _StartInstanceDisks(cfg, instance, force):
         """Start the disks of an instance.
         """
         disks_ok, dummy = _AssembleInstanceDisks(instance, cfg,
                                                  ignore_secondaries=force)
         if not disks_ok:
           _ShutdownInstanceDisks(instance, cfg)
           if force is not None and not force:
             logger.Error("If the message above refers to a secondary node,"
                          " you can retry the operation using '--force'.")
           raise errors.OpExecError("Disk consistency error")
       class LUDeactivateInstanceDisks(NoHooksLU):
         """Shutdown an instance's disks.
         """
         _OP_REQP = ["instance_name"]
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the instance is in the cluster.
           """
           instance = self.cfg.GetInstanceInfo(
             self.cfg.ExpandInstanceName(self.op.instance_name))
           if instance is None:
             raise errors.OpPrereqError("Instance '%s' not known" %
                                        self.op.instance_name)
           self.instance = instance
         def Exec(self, feedback_fn):
           """Deactivate the disks
           """
           instance = self.instance
           ins_l = rpc.call_instance_list([instance.primary_node])
           ins_l = ins_l[instance.primary_node]
           if not type(ins_l) is list:
             raise errors.OpExecError("Can't contact node '%s'" %
                                      instance.primary_node)
           if self.instance.name in ins_l:
             raise errors.OpExecError("Instance is running, can't shutdown"
                                      " block devices.")
           _ShutdownInstanceDisks(instance, self.cfg)
       def _ShutdownInstanceDisks(instance, cfg, ignore_primary=False):
         """Shutdown block devices of an instance.
         This does the shutdown on all nodes of the instance.
         If the ignore_primary is false, errors on the primary node are
         ignored.
         """
         result = True
         for disk in instance.disks:
           for node, top_disk in disk.ComputeNodeTree(instance.primary_node):
             cfg.SetDiskID(top_disk, node)
             if not rpc.call_blockdev_shutdown(node, top_disk):
               logger.Error("could not shutdown block device %s on node %s" %
                            (disk.iv_name, node))
               if not ignore_primary or node != instance.primary_node:
                 result = False
         return result
       def _CheckNodeFreeMemory(cfg, node, reason, requested):
         """Checks if a node has enough free memory.
         This function check if a given node has the needed amount of free
         memory. In case the node has less memory or we cannot get the
         information from the node, this function raise an OpPrereqError
         exception.
         Args:
           - cfg: a ConfigWriter instance
           - node: the node name
           - reason: string to use in the error message
           - requested: the amount of memory in MiB
         """
         nodeinfo = rpc.call_node_info([node], cfg.GetVGName())
         if not nodeinfo or not isinstance(nodeinfo, dict):
           raise errors.OpPrereqError("Could not contact node %s for resource"
                                    " information" % (node,))
         free_mem = nodeinfo[node].get('memory_free')
         if not isinstance(free_mem, int):
           raise errors.OpPrereqError("Can't compute free memory on node %s, result"
                                    " was '%s'" % (node, free_mem))
         if requested > free_mem:
           raise errors.OpPrereqError("Not enough memory on node %s for %s:"
                                    " needed %s MiB, available %s MiB" %
                                    (node, reason, requested, free_mem))
       class LUStartupInstance(LogicalUnit):
         """Starts an instance.
         """
         HPATH = "instance-start"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_REQP = ["instance_name", "force"]
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on master, primary and secondary nodes of the instance.
           """
           env = {
             "FORCE": self.op.force,
+            }
           env.update(_BuildInstanceHookEnvByObject(self.instance))
           nl = ([self.sstore.GetMasterNode(), self.instance.primary_node] +
                 list(self.instance.secondary_nodes))
           return env, nl, nl
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the instance is in the cluster.
           """
           instance = self.cfg.GetInstanceInfo(
             self.cfg.ExpandInstanceName(self.op.instance_name))
           if instance is None:
             raise errors.OpPrereqError("Instance '%s' not known" %
                                        self.op.instance_name)
           # check bridges existance
           _CheckInstanceBridgesExist(instance)
           _CheckNodeFreeMemory(self.cfg, instance.primary_node,
                                "starting instance %s" % instance.name,
                                instance.memory)
           self.instance = instance
           self.op.instance_name = instance.name
         def Exec(self, feedback_fn):
           """Start the instance.
           """
           instance = self.instance
           force = self.op.force
           extra_args = getattr(self.op, "extra_args", "")
           self.cfg.MarkInstanceUp(instance.name)
           node_current = instance.primary_node
           _StartInstanceDisks(self.cfg, instance, force)
           if not rpc.call_instance_start(node_current, instance, extra_args):
             _ShutdownInstanceDisks(instance, self.cfg)
             raise errors.OpExecError("Could not start instance")
       class LURebootInstance(LogicalUnit):
         """Reboot an instance.
         """
         HPATH = "instance-reboot"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_REQP = ["instance_name", "ignore_secondaries", "reboot_type"]
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on master, primary and secondary nodes of the instance.
           """
           env = {
             "IGNORE_SECONDARIES": self.op.ignore_secondaries,
+            }
           env.update(_BuildInstanceHookEnvByObject(self.instance))
           nl = ([self.sstore.GetMasterNode(), self.instance.primary_node] +
                 list(self.instance.secondary_nodes))
           return env, nl, nl
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the instance is in the cluster.
           """
           instance = self.cfg.GetInstanceInfo(
             self.cfg.ExpandInstanceName(self.op.instance_name))
           if instance is None:
             raise errors.OpPrereqError("Instance '%s' not known" %
                                        self.op.instance_name)
           # check bridges existance
           _CheckInstanceBridgesExist(instance)
           self.instance = instance
           self.op.instance_name = instance.name
         def Exec(self, feedback_fn):
           """Reboot the instance.
           """
           instance = self.instance
           ignore_secondaries = self.op.ignore_secondaries
           reboot_type = self.op.reboot_type
           extra_args = getattr(self.op, "extra_args", "")
           node_current = instance.primary_node
           if reboot_type not in [constants.INSTANCE_REBOOT_SOFT,
                                  constants.INSTANCE_REBOOT_HARD,
                                  constants.INSTANCE_REBOOT_FULL]:
             raise errors.ParameterError("reboot type not in [%s, %s, %s]" %
                                         (constants.INSTANCE_REBOOT_SOFT,
                                          constants.INSTANCE_REBOOT_HARD,
                                          constants.INSTANCE_REBOOT_FULL))
           if reboot_type in [constants.INSTANCE_REBOOT_SOFT,
                              constants.INSTANCE_REBOOT_HARD]:
             if not rpc.call_instance_reboot(node_current, instance,
                                             reboot_type, extra_args):
               raise errors.OpExecError("Could not reboot instance")
           else:
             if not rpc.call_instance_shutdown(node_current, instance):
               raise errors.OpExecError("could not shutdown instance for full reboot")
             _ShutdownInstanceDisks(instance, self.cfg)
             _StartInstanceDisks(self.cfg, instance, ignore_secondaries)
             if not rpc.call_instance_start(node_current, instance, extra_args):
               _ShutdownInstanceDisks(instance, self.cfg)
               raise errors.OpExecError("Could not start instance for full reboot")
           self.cfg.MarkInstanceUp(instance.name)
       class LUShutdownInstance(LogicalUnit):
         """Shutdown an instance.
         """
         HPATH = "instance-stop"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_REQP = ["instance_name"]
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on master, primary and secondary nodes of the instance.
           """
           env = _BuildInstanceHookEnvByObject(self.instance)
           nl = ([self.sstore.GetMasterNode(), self.instance.primary_node] +
                 list(self.instance.secondary_nodes))
           return env, nl, nl
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the instance is in the cluster.
           """
           instance = self.cfg.GetInstanceInfo(
             self.cfg.ExpandInstanceName(self.op.instance_name))
           if instance is None:
             raise errors.OpPrereqError("Instance '%s' not known" %
                                        self.op.instance_name)
           self.instance = instance
         def Exec(self, feedback_fn):
           """Shutdown the instance.
           """
           instance = self.instance
           node_current = instance.primary_node
           self.cfg.MarkInstanceDown(instance.name)
           if not rpc.call_instance_shutdown(node_current, instance):
             logger.Error("could not shutdown instance")
           _ShutdownInstanceDisks(instance, self.cfg)
       class LUReinstallInstance(LogicalUnit):
         """Reinstall an instance.
         """
         HPATH = "instance-reinstall"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_REQP = ["instance_name"]
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on master, primary and secondary nodes of the instance.
           """
           env = _BuildInstanceHookEnvByObject(self.instance)
           nl = ([self.sstore.GetMasterNode(), self.instance.primary_node] +
                 list(self.instance.secondary_nodes))
           return env, nl, nl
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the instance is in the cluster and is not running.
           """
           instance = self.cfg.GetInstanceInfo(
             self.cfg.ExpandInstanceName(self.op.instance_name))
           if instance is None:
             raise errors.OpPrereqError("Instance '%s' not known" %
                                        self.op.instance_name)
           if instance.disk_template == constants.DT_DISKLESS:
             raise errors.OpPrereqError("Instance '%s' has no disks" %
                                        self.op.instance_name)
           if instance.status != "down":
             raise errors.OpPrereqError("Instance '%s' is marked to be up" %
                                        self.op.instance_name)
           remote_info = rpc.call_instance_info(instance.primary_node, instance.name)
           if remote_info:
             raise errors.OpPrereqError("Instance '%s' is running on the node %s" %
                                        (self.op.instance_name,
                                         instance.primary_node))
           self.op.os_type = getattr(self.op, "os_type", None)
           if self.op.os_type is not None:
             # OS verification
             pnode = self.cfg.GetNodeInfo(
               self.cfg.ExpandNodeName(instance.primary_node))
             if pnode is None:
               raise errors.OpPrereqError("Primary node '%s' is unknown" %
                                          self.op.pnode)
             os_obj = rpc.call_os_get(pnode.name, self.op.os_type)
             if not os_obj:
               raise errors.OpPrereqError("OS '%s' not in supported OS list for"
                                          " primary node"  % self.op.os_type)
           self.instance = instance
         def Exec(self, feedback_fn):
           """Reinstall the instance.
           """
           inst = self.instance
           if self.op.os_type is not None:
             feedback_fn("Changing OS to '%s'..." % self.op.os_type)
             inst.os = self.op.os_type
             self.cfg.AddInstance(inst)
           _StartInstanceDisks(self.cfg, inst, None)
           try:
             feedback_fn("Running the instance OS create scripts...")
             if not rpc.call_instance_os_add(inst.primary_node, inst, "sda", "sdb"):
               raise errors.OpExecError("Could not install OS for instance %s"
                                        " on node %s" %
                                        (inst.name, inst.primary_node))
           finally:
             _ShutdownInstanceDisks(inst, self.cfg)
       class LURenameInstance(LogicalUnit):
         """Rename an instance.
         """
         HPATH = "instance-rename"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_REQP = ["instance_name", "new_name"]
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on master, primary and secondary nodes of the instance.
           """
           env = _BuildInstanceHookEnvByObject(self.instance)
           env["INSTANCE_NEW_NAME"] = self.op.new_name
           nl = ([self.sstore.GetMasterNode(), self.instance.primary_node] +
                 list(self.instance.secondary_nodes))
           return env, nl, nl
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the instance is in the cluster and is not running.
           """
           instance = self.cfg.GetInstanceInfo(
             self.cfg.ExpandInstanceName(self.op.instance_name))
           if instance is None:
             raise errors.OpPrereqError("Instance '%s' not known" %
                                        self.op.instance_name)
           if instance.status != "down":
             raise errors.OpPrereqError("Instance '%s' is marked to be up" %
                                        self.op.instance_name)
           remote_info = rpc.call_instance_info(instance.primary_node, instance.name)
           if remote_info:
             raise errors.OpPrereqError("Instance '%s' is running on the node %s" %
                                        (self.op.instance_name,
                                         instance.primary_node))
           self.instance = instance
           # new name verification
           name_info = utils.HostInfo(self.op.new_name)
           self.op.new_name = new_name = name_info.name
           instance_list = self.cfg.GetInstanceList()
           if new_name in instance_list:
             raise errors.OpPrereqError("Instance '%s' is already in the cluster" %
                                        new_name)
           if not getattr(self.op, "ignore_ip", False):
             command = ["fping", "-q", name_info.ip]
             result = utils.RunCmd(command)
             if not result.failed:
               raise errors.OpPrereqError("IP %s of instance %s already in use" %
                                          (name_info.ip, new_name))
         def Exec(self, feedback_fn):
           """Reinstall the instance.
           """
           inst = self.instance
           old_name = inst.name
           if inst.disk_template == constants.DT_FILE:
             old_file_storage_dir = os.path.dirname(inst.disks[0].logical_id[1])
           self.cfg.RenameInstance(inst.name, self.op.new_name)
           # re-read the instance from the configuration after rename
           inst = self.cfg.GetInstanceInfo(self.op.new_name)
           if inst.disk_template == constants.DT_FILE:
             new_file_storage_dir = os.path.dirname(inst.disks[0].logical_id[1])
             result = rpc.call_file_storage_dir_rename(inst.primary_node,
                                                       old_file_storage_dir,
                                                       new_file_storage_dir)
             if not result:
               raise errors.OpExecError("Could not connect to node '%s' to rename"
                                        " directory '%s' to '%s' (but the instance"
                                        " has been renamed in Ganeti)" % (
                                        inst.primary_node, old_file_storage_dir,
                                        new_file_storage_dir))
             if not result[0]:
               raise errors.OpExecError("Could not rename directory '%s' to '%s'"
                                        " (but the instance has been renamed in"
                                        " Ganeti)" % (old_file_storage_dir,
                                                      new_file_storage_dir))
           _StartInstanceDisks(self.cfg, inst, None)
           try:
             if not rpc.call_instance_run_rename(inst.primary_node, inst, old_name,
                                                 "sda", "sdb"):
               msg = ("Could run OS rename script for instance %s on node %s (but the"
                      " instance has been renamed in Ganeti)" %
                      (inst.name, inst.primary_node))
               logger.Error(msg)
           finally:
             _ShutdownInstanceDisks(inst, self.cfg)
       class LURemoveInstance(LogicalUnit):
         """Remove an instance.
         """
         HPATH = "instance-remove"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_REQP = ["instance_name", "ignore_failures"]
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on master, primary and secondary nodes of the instance.
           """
           env = _BuildInstanceHookEnvByObject(self.instance)
           nl = [self.sstore.GetMasterNode()]
           return env, nl, nl
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the instance is in the cluster.
           """
           instance = self.cfg.GetInstanceInfo(
             self.cfg.ExpandInstanceName(self.op.instance_name))
           if instance is None:
             raise errors.OpPrereqError("Instance '%s' not known" %
                                        self.op.instance_name)
           self.instance = instance
         def Exec(self, feedback_fn):
           """Remove the instance.
           """
           instance = self.instance
           logger.Info("shutting down instance %s on node %s" %
                       (instance.name, instance.primary_node))
           if not rpc.call_instance_shutdown(instance.primary_node, instance):
             if self.op.ignore_failures:
               feedback_fn("Warning: can't shutdown instance")
             else:
               raise errors.OpExecError("Could not shutdown instance %s on node %s" %
                                        (instance.name, instance.primary_node))
           logger.Info("removing block devices for instance %s" % instance.name)
           if not _RemoveDisks(instance, self.cfg):
             if self.op.ignore_failures:
               feedback_fn("Warning: can't remove instance's disks")
             else:
               raise errors.OpExecError("Can't remove instance's disks")
           logger.Info("removing instance %s out of cluster config" % instance.name)
           self.cfg.RemoveInstance(instance.name)
       class LUQueryInstances(NoHooksLU):
         """Logical unit for querying instances.
         """
         _OP_REQP = ["output_fields", "names"]
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the fields required are valid output fields.
           """
           self.dynamic_fields = frozenset(["oper_state", "oper_ram", "status"])
           _CheckOutputFields(static=["name", "os", "pnode", "snodes",
                                      "admin_state", "admin_ram",
                                      "disk_template", "ip", "mac", "bridge",
                                      "sda_size", "sdb_size", "vcpus"],
                              dynamic=self.dynamic_fields,
                              selected=self.op.output_fields)
           self.wanted = _GetWantedInstances(self, self.op.names)
         def Exec(self, feedback_fn):
           """Computes the list of nodes and their attributes.
           """
           instance_names = self.wanted
           instance_list = [self.cfg.GetInstanceInfo(iname) for iname
                            in instance_names]
           # begin data gathering
           nodes = frozenset([inst.primary_node for inst in instance_list])
           bad_nodes = []
           if self.dynamic_fields.intersection(self.op.output_fields):
             live_data = {}
             node_data = rpc.call_all_instances_info(nodes)
             for name in nodes:
               result = node_data[name]
               if result:
                 live_data.update(result)
               elif result == False:
                 bad_nodes.append(name)
               # else no instance is alive
           else:
             live_data = dict([(name, {}) for name in instance_names])
           # end data gathering
           output = []
           for instance in instance_list:
             iout = []
             for field in self.op.output_fields:
               if field == "name":
                 val = instance.name
               elif field == "os":
                 val = instance.os
               elif field == "pnode":
                 val = instance.primary_node
               elif field == "snodes":
                 val = list(instance.secondary_nodes)
               elif field == "admin_state":
                 val = (instance.status != "down")
               elif field == "oper_state":
                 if instance.primary_node in bad_nodes:
                   val = None
                 else:
                   val = bool(live_data.get(instance.name))
               elif field == "status":
                 if instance.primary_node in bad_nodes:
                   val = "ERROR_nodedown"
                 else:
                   running = bool(live_data.get(instance.name))
                   if running:
                     if instance.status != "down":
                       val = "running"
                     else:
                       val = "ERROR_up"
                   else:
                     if instance.status != "down":
                       val = "ERROR_down"
                     else:
                       val = "ADMIN_down"
               elif field == "admin_ram":
                 val = instance.memory
               elif field == "oper_ram":
                 if instance.primary_node in bad_nodes:
                   val = None
                 elif instance.name in live_data:
                   val = live_data[instance.name].get("memory", "?")
                 else:
                   val = "-"
               elif field == "disk_template":
                 val = instance.disk_template
               elif field == "ip":
                 val = instance.nics[0].ip
               elif field == "bridge":
                 val = instance.nics[0].bridge
               elif field == "mac":
                 val = instance.nics[0].mac
               elif field == "sda_size" or field == "sdb_size":
                 disk = instance.FindDisk(field[:3])
                 if disk is None:
                   val = None
                 else:
                   val = disk.size
               elif field == "vcpus":
                 val = instance.vcpus
               else:
                 raise errors.ParameterError(field)
               iout.append(val)
             output.append(iout)
           return output
       class LUFailoverInstance(LogicalUnit):
         """Failover an instance.
         """
         HPATH = "instance-failover"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_REQP = ["instance_name", "ignore_consistency"]
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on master, primary and secondary nodes of the instance.
           """
           env = {
             "IGNORE_CONSISTENCY": self.op.ignore_consistency,
+            }
           env.update(_BuildInstanceHookEnvByObject(self.instance))
           nl = [self.sstore.GetMasterNode()] + list(self.instance.secondary_nodes)
           return env, nl, nl
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the instance is in the cluster.
           """
           instance = self.cfg.GetInstanceInfo(
             self.cfg.ExpandInstanceName(self.op.instance_name))
           if instance is None:
             raise errors.OpPrereqError("Instance '%s' not known" %
                                        self.op.instance_name)
           if instance.disk_template not in constants.DTS_NET_MIRROR:
             raise errors.OpPrereqError("Instance's disk layout is not"
                                        " network mirrored, cannot failover.")
           secondary_nodes = instance.secondary_nodes
           if not secondary_nodes:
             raise errors.ProgrammerError("no secondary node but using "
                                          "a mirrored disk template")
           target_node = secondary_nodes[0]
           # check memory requirements on the secondary node
           _CheckNodeFreeMemory(self.cfg, target_node, "failing over instance %s" %
                                instance.name, instance.memory)
           # check bridge existance
           brlist = [nic.bridge for nic in instance.nics]
           if not rpc.call_bridges_exist(target_node, brlist):
             raise errors.OpPrereqError("One or more target bridges %s does not"
                                        " exist on destination node '%s'" %
                                        (brlist, target_node))
           self.instance = instance
         def Exec(self, feedback_fn):
           """Failover an instance.
           The failover is done by shutting it down on its present node and
           starting it on the secondary.
           """
           instance = self.instance
           source_node = instance.primary_node
           target_node = instance.secondary_nodes[0]
           feedback_fn("* checking disk consistency between source and target")
           for dev in instance.disks:
             # for drbd, these are drbd over lvm
             if not _CheckDiskConsistency(self.cfg, dev, target_node, False):
               if instance.status == "up" and not self.op.ignore_consistency:
                 raise errors.OpExecError("Disk %s is degraded on target node,"
                                          " aborting failover." % dev.iv_name)
           feedback_fn("* shutting down instance on source node")
           logger.Info("Shutting down instance %s on node %s" %
                       (instance.name, source_node))
           if not rpc.call_instance_shutdown(source_node, instance):
             if self.op.ignore_consistency:
               logger.Error("Could not shutdown instance %s on node %s. Proceeding"
                            " anyway. Please make sure node %s is down"  %
                            (instance.name, source_node, source_node))
             else:
               raise errors.OpExecError("Could not shutdown instance %s on node %s" %
                                        (instance.name, source_node))
           feedback_fn("* deactivating the instance's disks on source node")
           if not _ShutdownInstanceDisks(instance, self.cfg, ignore_primary=True):
             raise errors.OpExecError("Can't shut down the instance's disks.")
           instance.primary_node = target_node
           # distribute new instance config to the other nodes
           self.cfg.AddInstance(instance)
           # Only start the instance if it's marked as up
           if instance.status == "up":
             feedback_fn("* activating the instance's disks on target node")
             logger.Info("Starting instance %s on node %s" %
                         (instance.name, target_node))
             disks_ok, dummy = _AssembleInstanceDisks(instance, self.cfg,
                                                      ignore_secondaries=True)
             if not disks_ok:
               _ShutdownInstanceDisks(instance, self.cfg)
               raise errors.OpExecError("Can't activate the instance's disks")
             feedback_fn("* starting the instance on the target node")
             if not rpc.call_instance_start(target_node, instance, None):
               _ShutdownInstanceDisks(instance, self.cfg)
               raise errors.OpExecError("Could not start instance %s on node %s." %
                                        (instance.name, target_node))
       def _CreateBlockDevOnPrimary(cfg, node, instance, device, info):
         """Create a tree of block devices on the primary node.
         This always creates all devices.
         """
         if device.children:
           for child in device.children:
             if not _CreateBlockDevOnPrimary(cfg, node, instance, child, info):
               return False
         cfg.SetDiskID(device, node)
         new_id = rpc.call_blockdev_create(node, device, device.size,
                                           instance.name, True, info)
         if not new_id:
           return False
         if device.physical_id is None:
           device.physical_id = new_id
         return True
       def _CreateBlockDevOnSecondary(cfg, node, instance, device, force, info):
         """Create a tree of block devices on a secondary node.
         If this device type has to be created on secondaries, create it and
         all its children.
         If not, just recurse to children keeping the same 'force' value.
         """
         if device.CreateOnSecondary():
           force = True
         if device.children:
           for child in device.children:
             if not _CreateBlockDevOnSecondary(cfg, node, instance,
                                               child, force, info):
               return False
         if not force:
           return True
         cfg.SetDiskID(device, node)
         new_id = rpc.call_blockdev_create(node, device, device.size,
                                           instance.name, False, info)
         if not new_id:
           return False
         if device.physical_id is None:
           device.physical_id = new_id
         return True
       def _GenerateUniqueNames(cfg, exts):
         """Generate a suitable LV name.
         This will generate a logical volume name for the given instance.
         """
         results = []
         for val in exts:
           new_id = cfg.GenerateUniqueID()
           results.append("%s%s" % (new_id, val))
         return results
       def _GenerateMDDRBDBranch(cfg, primary, secondary, size, names):
         """Generate a drbd device complete with its children.
         """
         port = cfg.AllocatePort()
         vgname = cfg.GetVGName()
         dev_data = objects.Disk(dev_type=constants.LD_LV, size=size,
                                 logical_id=(vgname, names[0]))
         dev_meta = objects.Disk(dev_type=constants.LD_LV, size=128,
                                 logical_id=(vgname, names[1]))
         drbd_dev = objects.Disk(dev_type=constants.LD_DRBD7, size=size,
                                 logical_id = (primary, secondary, port),
                                 children = [dev_data, dev_meta])
         return drbd_dev
       def _GenerateDRBD8Branch(cfg, primary, secondary, size, names, iv_name):
         """Generate a drbd8 device complete with its children.
         """
         port = cfg.AllocatePort()
         vgname = cfg.GetVGName()
         dev_data = objects.Disk(dev_type=constants.LD_LV, size=size,
                                 logical_id=(vgname, names[0]))
         dev_meta = objects.Disk(dev_type=constants.LD_LV, size=128,
                                 logical_id=(vgname, names[1]))
         drbd_dev = objects.Disk(dev_type=constants.LD_DRBD8, size=size,
                                 logical_id = (primary, secondary, port),
                                 children = [dev_data, dev_meta],
                                 iv_name=iv_name)
         return drbd_dev
       def _GenerateDiskTemplate(cfg, template_name,
                                 instance_name, primary_node,
                                 secondary_nodes, disk_sz, swap_sz,
                                 file_storage_dir, file_driver):
         """Generate the entire disk layout for a given template type.
         """
         #TODO: compute space requirements
         vgname = cfg.GetVGName()
         if template_name == constants.DT_DISKLESS:
           disks = []
         elif template_name == constants.DT_PLAIN:
           if len(secondary_nodes) != 0:
             raise errors.ProgrammerError("Wrong template configuration")
           names = _GenerateUniqueNames(cfg, [".sda", ".sdb"])
           sda_dev = objects.Disk(dev_type=constants.LD_LV, size=disk_sz,
                                  logical_id=(vgname, names[0]),
                                  iv_name = "sda")
           sdb_dev = objects.Disk(dev_type=constants.LD_LV, size=swap_sz,
                                  logical_id=(vgname, names[1]),
                                  iv_name = "sdb")
           disks = [sda_dev, sdb_dev]
         elif template_name == constants.DT_DRBD8:
           if len(secondary_nodes) != 1:
             raise errors.ProgrammerError("Wrong template configuration")
           remote_node = secondary_nodes[0]
           names = _GenerateUniqueNames(cfg, [".sda_data", ".sda_meta",
                                              ".sdb_data", ".sdb_meta"])
           drbd_sda_dev = _GenerateDRBD8Branch(cfg, primary_node, remote_node,
                                                disk_sz, names[0:2], "sda")
           drbd_sdb_dev = _GenerateDRBD8Branch(cfg, primary_node, remote_node,
                                                swap_sz, names[2:4], "sdb")
           disks = [drbd_sda_dev, drbd_sdb_dev]
         elif template_name == constants.DT_FILE:
           if len(secondary_nodes) != 0:
             raise errors.ProgrammerError("Wrong template configuration")
           file_sda_dev = objects.Disk(dev_type=constants.LD_FILE, size=disk_sz,
                                       iv_name="sda", logical_id=(file_driver,
                                       "%s/sda" % file_storage_dir))
           file_sdb_dev = objects.Disk(dev_type=constants.LD_FILE, size=swap_sz,
                                       iv_name="sdb", logical_id=(file_driver,
                                       "%s/sdb" % file_storage_dir))
           disks = [file_sda_dev, file_sdb_dev]
         else:
           raise errors.ProgrammerError("Invalid disk template '%s'" % template_name)
         return disks
       def _GetInstanceInfoText(instance):
         """Compute that text that should be added to the disk's metadata.
         """
         return "originstname+%s" % instance.name
       def _CreateDisks(cfg, instance):
         """Create all disks for an instance.
         This abstracts away some work from AddInstance.
         Args:
           instance: the instance object
         Returns:
           True or False showing the success of the creation process
         """
         info = _GetInstanceInfoText(instance)
         if instance.disk_template == constants.DT_FILE:
           file_storage_dir = os.path.dirname(instance.disks[0].logical_id[1])
           result = rpc.call_file_storage_dir_create(instance.primary_node,
                                                     file_storage_dir)
           if not result:
             logger.Error("Could not connect to node '%s'" % instance.primary_node)
             return False
           if not result[0]:
             logger.Error("failed to create directory '%s'" % file_storage_dir)
             return False
         for device in instance.disks:
           logger.Info("creating volume %s for instance %s" %
                       (device.iv_name, instance.name))
           #HARDCODE
           for secondary_node in instance.secondary_nodes:
             if not _CreateBlockDevOnSecondary(cfg, secondary_node, instance,
                                               device, False, info):
               logger.Error("failed to create volume %s (%s) on secondary node %s!" %
                            (device.iv_name, device, secondary_node))
               return False
           #HARDCODE
           if not _CreateBlockDevOnPrimary(cfg, instance.primary_node,
                                           instance, device, info):
             logger.Error("failed to create volume %s on primary!" %
                          device.iv_name)
             return False
         return True
       def _RemoveDisks(instance, cfg):
         """Remove all disks for an instance.
         This abstracts away some work from `AddInstance()` and
         `RemoveInstance()`. Note that in case some of the devices couldn't
         be removed, the removal will continue with the other ones (compare
         with `_CreateDisks()`).
         Args:
           instance: the instance object
         Returns:
           True or False showing the success of the removal proces
         """
         logger.Info("removing block devices for instance %s" % instance.name)
         result = True
         for device in instance.disks:
           for node, disk in device.ComputeNodeTree(instance.primary_node):
             cfg.SetDiskID(disk, node)
             if not rpc.call_blockdev_remove(node, disk):
               logger.Error("could not remove block device %s on node %s,"
                            " continuing anyway" %
                            (device.iv_name, node))
               result = False
         if instance.disk_template == constants.DT_FILE:
           file_storage_dir = os.path.dirname(instance.disks[0].logical_id[1])
           if not rpc.call_file_storage_dir_remove(instance.primary_node,
                                                   file_storage_dir):
             logger.Error("could not remove directory '%s'" % file_storage_dir)
             result = False
         return result
       def _ComputeDiskSize(disk_template, disk_size, swap_size):
         """Compute disk size requirements in the volume group
         This is currently hard-coded for the two-drive layout.
         """
         # Required free disk space as a function of disk and swap space
         req_size_dict = {
           constants.DT_DISKLESS: None,
           constants.DT_PLAIN: disk_size + swap_size,
           # 256 MB are added for drbd metadata, 128MB for each drbd device
           constants.DT_DRBD8: disk_size + swap_size + 256,
           constants.DT_FILE: None,
+        }
         if disk_template not in req_size_dict:
           raise errors.ProgrammerError("Disk template '%s' size requirement"
                                        " is unknown" %  disk_template)
         return req_size_dict[disk_template]
       class LUCreateInstance(LogicalUnit):
         """Create an instance.
         """
         HPATH = "instance-add"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_REQP = ["instance_name", "mem_size", "disk_size",
                     "disk_template", "swap_size", "mode", "start", "vcpus",
                     "wait_for_sync", "ip_check", "mac"]
         def _RunAllocator(self):
           """Run the allocator based on input opcode.
           """
           disks = [{"size": self.op.disk_size, "mode": "w"},
                    {"size": self.op.swap_size, "mode": "w"}]
           nics = [{"mac": self.op.mac, "ip": getattr(self.op, "ip", None),
                    "bridge": self.op.bridge}]
           ial = IAllocator(self.cfg, self.sstore,
                            mode=constants.IALLOCATOR_MODE_ALLOC,
                            name=self.op.instance_name,
                            disk_template=self.op.disk_template,
                            tags=[],
                            os=self.op.os_type,
                            vcpus=self.op.vcpus,
                            mem_size=self.op.mem_size,
                            disks=disks,
                            nics=nics,
+                           )
           ial.Run(self.op.iallocator)
           if not ial.success:
             raise errors.OpPrereqError("Can't compute nodes using"
                                        " iallocator '%s': %s" % (self.op.iallocator,
                                                                  ial.info))
           if len(ial.nodes) != ial.required_nodes:
             raise errors.OpPrereqError("iallocator '%s' returned invalid number"
                                        " of nodes (%s), required %s" %
                                        (len(ial.nodes), ial.required_nodes))
           self.op.pnode = ial.nodes[0]
           logger.ToStdout("Selected nodes for the instance: %s" %
                           (", ".join(ial.nodes),))
           logger.Info("Selected nodes for instance %s via iallocator %s: %s" %
                       (self.op.instance_name, self.op.iallocator, ial.nodes))
           if ial.required_nodes == 2:
             self.op.snode = ial.nodes[1]
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on master, primary and secondary nodes of the instance.
           """
           env = {
             "INSTANCE_DISK_TEMPLATE": self.op.disk_template,
             "INSTANCE_DISK_SIZE": self.op.disk_size,
             "INSTANCE_SWAP_SIZE": self.op.swap_size,
             "INSTANCE_ADD_MODE": self.op.mode,
+            }
           if self.op.mode == constants.INSTANCE_IMPORT:
             env["INSTANCE_SRC_NODE"] = self.op.src_node
             env["INSTANCE_SRC_PATH"] = self.op.src_path
             env["INSTANCE_SRC_IMAGE"] = self.src_image
           env.update(_BuildInstanceHookEnv(name=self.op.instance_name,
             primary_node=self.op.pnode,
             secondary_nodes=self.secondaries,
             status=self.instance_status,
             os_type=self.op.os_type,
             memory=self.op.mem_size,
             vcpus=self.op.vcpus,
             nics=[(self.inst_ip, self.op.bridge, self.op.mac)],
           ))
           nl = ([self.sstore.GetMasterNode(), self.op.pnode] +
                 self.secondaries)
           return env, nl, nl
         def CheckPrereq(self):
           """Check prerequisites.
           """
           # set optional parameters to none if they don't exist
           for attr in ["kernel_path", "initrd_path", "hvm_boot_order", "pnode",
                        "iallocator", "hvm_acpi", "hvm_pae", "hvm_cdrom_image_path",
                        "vnc_bind_address"]:
             if not hasattr(self.op, attr):
               setattr(self.op, attr, None)
           if self.op.mode not in (constants.INSTANCE_CREATE,
                                   constants.INSTANCE_IMPORT):
             raise errors.OpPrereqError("Invalid instance creation mode '%s'" %
                                        self.op.mode)
           if (not self.cfg.GetVGName() and
               self.op.disk_template not in constants.DTS_NOT_LVM):
             raise errors.OpPrereqError("Cluster does not support lvm-based"
                                        " instances")
           if self.op.mode == constants.INSTANCE_IMPORT:
             src_node = getattr(self.op, "src_node", None)
             src_path = getattr(self.op, "src_path", None)
             if src_node is None or src_path is None:
               raise errors.OpPrereqError("Importing an instance requires source"
                                          " node and path options")
             src_node_full = self.cfg.ExpandNodeName(src_node)
             if src_node_full is None:
               raise errors.OpPrereqError("Unknown source node '%s'" % src_node)
             self.op.src_node = src_node = src_node_full
             if not os.path.isabs(src_path):
               raise errors.OpPrereqError("The source path must be absolute")
             export_info = rpc.call_export_info(src_node, src_path)
             if not export_info:
               raise errors.OpPrereqError("No export found in dir %s" % src_path)
             if not export_info.has_section(constants.INISECT_EXP):
               raise errors.ProgrammerError("Corrupted export config")
             ei_version = export_info.get(constants.INISECT_EXP, 'version')
             if (int(ei_version) != constants.EXPORT_VERSION):
               raise errors.OpPrereqError("Wrong export version %s (wanted %d)" %
                                          (ei_version, constants.EXPORT_VERSION))
             if int(export_info.get(constants.INISECT_INS, 'disk_count')) > 1:
               raise errors.OpPrereqError("Can't import instance with more than"
                                          " one data disk")
             # FIXME: are the old os-es, disk sizes, etc. useful?
             self.op.os_type = export_info.get(constants.INISECT_EXP, 'os')
             diskimage = os.path.join(src_path, export_info.get(constants.INISECT_INS,
                                                                'disk0_dump'))
             self.src_image = diskimage
           else: # INSTANCE_CREATE
             if getattr(self.op, "os_type", None) is None:
               raise errors.OpPrereqError("No guest OS specified")
           #### instance parameters check
           # disk template and mirror node verification
           if self.op.disk_template not in constants.DISK_TEMPLATES:
             raise errors.OpPrereqError("Invalid disk template name")
           # instance name verification
           hostname1 = utils.HostInfo(self.op.instance_name)
           self.op.instance_name = instance_name = hostname1.name
           instance_list = self.cfg.GetInstanceList()
           if instance_name in instance_list:
             raise errors.OpPrereqError("Instance '%s' is already in the cluster" %
                                        instance_name)
           # ip validity checks
           ip = getattr(self.op, "ip", None)
           if ip is None or ip.lower() == "none":
             inst_ip = None
           elif ip.lower() == "auto":
             inst_ip = hostname1.ip
           else:
             if not utils.IsValidIP(ip):
               raise errors.OpPrereqError("given IP address '%s' doesn't look"
                                          " like a valid IP" % ip)
             inst_ip = ip
           self.inst_ip = self.op.ip = inst_ip
           if self.op.start and not self.op.ip_check:
             raise errors.OpPrereqError("Cannot ignore IP address conflicts when"
                                        " adding an instance in start mode")
           if self.op.ip_check:
             if utils.TcpPing(hostname1.ip, constants.DEFAULT_NODED_PORT):
               raise errors.OpPrereqError("IP %s of instance %s already in use" %
                                          (hostname1.ip, instance_name))
           # MAC address verification
           if self.op.mac != "auto":
             if not utils.IsValidMac(self.op.mac.lower()):
               raise errors.OpPrereqError("invalid MAC address specified: %s" %
                                          self.op.mac)
           # bridge verification
           bridge = getattr(self.op, "bridge", None)
           if bridge is None:
             self.op.bridge = self.cfg.GetDefBridge()
           else:
             self.op.bridge = bridge
           # boot order verification
           if self.op.hvm_boot_order is not None:
             if len(self.op.hvm_boot_order.strip("acdn")) != 0:
               raise errors.OpPrereqError("invalid boot order specified,"
                                          " must be one or more of [acdn]")
           # file storage checks
           if (self.op.file_driver and
               not self.op.file_driver in constants.FILE_DRIVER):
             raise errors.OpPrereqError("Invalid file driver name '%s'" %
                                        self.op.file_driver)
           if self.op.file_storage_dir and os.path.isabs(self.op.file_storage_dir):
             raise errors.OpPrereqError("File storage directory not a relative"
                                        " path")
           #### allocator run
           if [self.op.iallocator, self.op.pnode].count(None) != 1:
             raise errors.OpPrereqError("One and only one of iallocator and primary"
                                        " node must be given")
           if self.op.iallocator is not None:
             self._RunAllocator()
           #### node related checks
           # check primary node
           pnode = self.cfg.GetNodeInfo(self.cfg.ExpandNodeName(self.op.pnode))
           if pnode is None:
             raise errors.OpPrereqError("Primary node '%s' is unknown" %
                                        self.op.pnode)
           self.op.pnode = pnode.name
           self.pnode = pnode
           self.secondaries = []
           # mirror node verification
           if self.op.disk_template in constants.DTS_NET_MIRROR:
             if getattr(self.op, "snode", None) is None:
               raise errors.OpPrereqError("The networked disk templates need"
                                          " a mirror node")
             snode_name = self.cfg.ExpandNodeName(self.op.snode)
             if snode_name is None:
               raise errors.OpPrereqError("Unknown secondary node '%s'" %
                                          self.op.snode)
             elif snode_name == pnode.name:
               raise errors.OpPrereqError("The secondary node cannot be"
                                          " the primary node.")
             self.secondaries.append(snode_name)
           req_size = _ComputeDiskSize(self.op.disk_template,
                                       self.op.disk_size, self.op.swap_size)
           # Check lv size requirements
           if req_size is not None:
             nodenames = [pnode.name] + self.secondaries
             nodeinfo = rpc.call_node_info(nodenames, self.cfg.GetVGName())
             for node in nodenames:
               info = nodeinfo.get(node, None)
               if not info:
                 raise errors.OpPrereqError("Cannot get current information"
                                            " from node '%s'" % nodeinfo)
               vg_free = info.get('vg_free', None)
               if not isinstance(vg_free, int):
                 raise errors.OpPrereqError("Can't compute free disk space on"
                                            " node %s" % node)
               if req_size > info['vg_free']:
                 raise errors.OpPrereqError("Not enough disk space on target node %s."
                                            " %d MB available, %d MB required" %
                                            (node, info['vg_free'], req_size))
           # os verification
           os_obj = rpc.call_os_get(pnode.name, self.op.os_type)
           if not os_obj:
             raise errors.OpPrereqError("OS '%s' not in supported os list for"
                                        " primary node"  % self.op.os_type)
           if self.op.kernel_path == constants.VALUE_NONE:
             raise errors.OpPrereqError("Can't set instance kernel to none")
           # bridge check on primary node
           if not rpc.call_bridges_exist(self.pnode.name, [self.op.bridge]):
             raise errors.OpPrereqError("target bridge '%s' does not exist on"
                                        " destination node '%s'" %
                                        (self.op.bridge, pnode.name))
           # memory check on primary node
           if self.op.start:
             _CheckNodeFreeMemory(self.cfg, self.pnode.name,
                                  "creating instance %s" % self.op.instance_name,
                                  self.op.mem_size)
           # hvm_cdrom_image_path verification
           if self.op.hvm_cdrom_image_path is not None:
             if not os.path.isabs(self.op.hvm_cdrom_image_path):
               raise errors.OpPrereqError("The path to the HVM CDROM image must"
                                          " be an absolute path or None, not %s" %
                                          self.op.hvm_cdrom_image_path)
             if not os.path.isfile(self.op.hvm_cdrom_image_path):
               raise errors.OpPrereqError("The HVM CDROM image must either be a"
                                          " regular file or a symlink pointing to"
                                          " an existing regular file, not %s" %
                                          self.op.hvm_cdrom_image_path)
           # vnc_bind_address verification
           if self.op.vnc_bind_address is not None:
             if not utils.IsValidIP(self.op.vnc_bind_address):
               raise errors.OpPrereqError("given VNC bind address '%s' doesn't look"
                                          " like a valid IP address" %
                                          self.op.vnc_bind_address)
           if self.op.start:
             self.instance_status = 'up'
           else:
             self.instance_status = 'down'
         def Exec(self, feedback_fn):
           """Create and add the instance to the cluster.
           """
           instance = self.op.instance_name
           pnode_name = self.pnode.name
           if self.op.mac == "auto":
             mac_address = self.cfg.GenerateMAC()
           else:
             mac_address = self.op.mac
           nic = objects.NIC(bridge=self.op.bridge, mac=mac_address)
           if self.inst_ip is not None:
             nic.ip = self.inst_ip
           ht_kind = self.sstore.GetHypervisorType()
           if ht_kind in constants.HTS_REQ_PORT:
             network_port = self.cfg.AllocatePort()
           else:
             network_port = None
           if self.op.vnc_bind_address is None:
             self.op.vnc_bind_address = constants.VNC_DEFAULT_BIND_ADDRESS
           # this is needed because os.path.join does not accept None arguments
           if self.op.file_storage_dir is None:
             string_file_storage_dir = ""
           else:
             string_file_storage_dir = self.op.file_storage_dir
           # build the full file storage dir path
           file_storage_dir = os.path.normpath(os.path.join(
                                               self.sstore.GetFileStorageDir(),
                                               string_file_storage_dir, instance))
           disks = _GenerateDiskTemplate(self.cfg,
                                         self.op.disk_template,
                                         instance, pnode_name,
                                         self.secondaries, self.op.disk_size,
                                         self.op.swap_size,
                                         file_storage_dir,
                                         self.op.file_driver)
           iobj = objects.Instance(name=instance, os=self.op.os_type,
                                   primary_node=pnode_name,
                                   memory=self.op.mem_size,
                                   vcpus=self.op.vcpus,
                                   nics=[nic], disks=disks,
                                   disk_template=self.op.disk_template,
                                   status=self.instance_status,
                                   network_port=network_port,
                                   kernel_path=self.op.kernel_path,
                                   initrd_path=self.op.initrd_path,
                                   hvm_boot_order=self.op.hvm_boot_order,
                                   hvm_acpi=self.op.hvm_acpi,
                                   hvm_pae=self.op.hvm_pae,
                                   hvm_cdrom_image_path=self.op.hvm_cdrom_image_path,
                                   vnc_bind_address=self.op.vnc_bind_address,
+                                  )
           feedback_fn("* creating instance disks...")
           if not _CreateDisks(self.cfg, iobj):
             _RemoveDisks(iobj, self.cfg)
             raise errors.OpExecError("Device creation failed, reverting...")
           feedback_fn("adding instance %s to cluster config" % instance)
           self.cfg.AddInstance(iobj)
           if self.op.wait_for_sync:
             disk_abort = not _WaitForSync(self.cfg, iobj, self.proc)
           elif iobj.disk_template in constants.DTS_NET_MIRROR:
             # make sure the disks are not degraded (still sync-ing is ok)
             time.sleep(15)
             feedback_fn("* checking mirrors status")
             disk_abort = not _WaitForSync(self.cfg, iobj, self.proc, oneshot=True)
           else:
             disk_abort = False
           if disk_abort:
             _RemoveDisks(iobj, self.cfg)
             self.cfg.RemoveInstance(iobj.name)
             raise errors.OpExecError("There are some degraded disks for"
                                      " this instance")
           feedback_fn("creating os for instance %s on node %s" %
                       (instance, pnode_name))
           if iobj.disk_template != constants.DT_DISKLESS:
             if self.op.mode == constants.INSTANCE_CREATE:
               feedback_fn("* running the instance OS create scripts...")
               if not rpc.call_instance_os_add(pnode_name, iobj, "sda", "sdb"):
                 raise errors.OpExecError("could not add os for instance %s"
                                          " on node %s" %
                                          (instance, pnode_name))
             elif self.op.mode == constants.INSTANCE_IMPORT:
               feedback_fn("* running the instance OS import scripts...")
               src_node = self.op.src_node
               src_image = self.src_image
               if not rpc.call_instance_os_import(pnode_name, iobj, "sda", "sdb",
                                                       src_node, src_image):
                 raise errors.OpExecError("Could not import os for instance"
                                          " %s on node %s" %
                                          (instance, pnode_name))
             else:
               # also checked in the prereq part
               raise errors.ProgrammerError("Unknown OS initialization mode '%s'"
                                            % self.op.mode)
           if self.op.start:
             logger.Info("starting instance %s on node %s" % (instance, pnode_name))
             feedback_fn("* starting instance...")
             if not rpc.call_instance_start(pnode_name, iobj, None):
               raise errors.OpExecError("Could not start instance")
       class LUConnectConsole(NoHooksLU):
         """Connect to an instance's console.
         This is somewhat special in that it returns the command line that
         you need to run on the master node in order to connect to the
         console.
         """
         _OP_REQP = ["instance_name"]
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the instance is in the cluster.
           """
           instance = self.cfg.GetInstanceInfo(
             self.cfg.ExpandInstanceName(self.op.instance_name))
           if instance is None:
             raise errors.OpPrereqError("Instance '%s' not known" %
                                        self.op.instance_name)
           self.instance = instance
         def Exec(self, feedback_fn):
           """Connect to the console of an instance
           """
           instance = self.instance
           node = instance.primary_node
           node_insts = rpc.call_instance_list([node])[node]
           if node_insts is False:
             raise errors.OpExecError("Can't connect to node %s." % node)
           if instance.name not in node_insts:
             raise errors.OpExecError("Instance %s is not running." % instance.name)
           logger.Debug("connecting to console of %s on %s" % (instance.name, node))
           hyper = hypervisor.GetHypervisor()
           console_cmd = hyper.GetShellCommandForConsole(instance)
           # build ssh cmdline
           return self.ssh.BuildCmd(node, "root", console_cmd, batch=True, tty=True)
       class LUReplaceDisks(LogicalUnit):
         """Replace the disks of an instance.
         """
         HPATH = "mirrors-replace"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_REQP = ["instance_name", "mode", "disks"]
         def _RunAllocator(self):
           """Compute a new secondary node using an IAllocator.
           """
           ial = IAllocator(self.cfg, self.sstore,
                            mode=constants.IALLOCATOR_MODE_RELOC,
                            name=self.op.instance_name,
                            relocate_from=[self.sec_node])
           ial.Run(self.op.iallocator)
           if not ial.success:
             raise errors.OpPrereqError("Can't compute nodes using"
                                        " iallocator '%s': %s" % (self.op.iallocator,
                                                                  ial.info))
           if len(ial.nodes) != ial.required_nodes:
             raise errors.OpPrereqError("iallocator '%s' returned invalid number"
                                        " of nodes (%s), required %s" %
                                        (len(ial.nodes), ial.required_nodes))
           self.op.remote_node = ial.nodes[0]
           logger.ToStdout("Selected new secondary for the instance: %s" %
                           self.op.remote_node)
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on the master, the primary and all the secondaries.
           """
           env = {
             "MODE": self.op.mode,
             "NEW_SECONDARY": self.op.remote_node,
             "OLD_SECONDARY": self.instance.secondary_nodes[0],
+            }
           env.update(_BuildInstanceHookEnvByObject(self.instance))
           nl = [
             self.sstore.GetMasterNode(),
             self.instance.primary_node,
+            ]
           if self.op.remote_node is not None:
             nl.append(self.op.remote_node)
           return env, nl, nl
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the instance is in the cluster.
           """
           if not hasattr(self.op, "remote_node"):
             self.op.remote_node = None
           instance = self.cfg.GetInstanceInfo(
             self.cfg.ExpandInstanceName(self.op.instance_name))
           if instance is None:
             raise errors.OpPrereqError("Instance '%s' not known" %
                                        self.op.instance_name)
           self.instance = instance
           self.op.instance_name = instance.name
           if instance.disk_template not in constants.DTS_NET_MIRROR:
             raise errors.OpPrereqError("Instance's disk layout is not"
                                        " network mirrored.")
           if len(instance.secondary_nodes) != 1:
             raise errors.OpPrereqError("The instance has a strange layout,"
                                        " expected one secondary but found %d" %
                                        len(instance.secondary_nodes))
           self.sec_node = instance.secondary_nodes[0]
           ia_name = getattr(self.op, "iallocator", None)
           if ia_name is not None:
             if self.op.remote_node is not None:
               raise errors.OpPrereqError("Give either the iallocator or the new"
                                          " secondary, not both")
             self.op.remote_node = self._RunAllocator()
           remote_node = self.op.remote_node
           if remote_node is not None:
             remote_node = self.cfg.ExpandNodeName(remote_node)
             if remote_node is None:
               raise errors.OpPrereqError("Node '%s' not known" %
                                          self.op.remote_node)
             self.remote_node_info = self.cfg.GetNodeInfo(remote_node)
           else:
             self.remote_node_info = None
           if remote_node == instance.primary_node:
             raise errors.OpPrereqError("The specified node is the primary node of"
                                        " the instance.")
           elif remote_node == self.sec_node:
             if self.op.mode == constants.REPLACE_DISK_SEC:
               # this is for DRBD8, where we can't execute the same mode of
               # replacement as for drbd7 (no different port allocated)
               raise errors.OpPrereqError("Same secondary given, cannot execute"
                                          " replacement")
           if instance.disk_template == constants.DT_DRBD8:
             if (self.op.mode == constants.REPLACE_DISK_ALL and
                 remote_node is not None):
               # switch to replace secondary mode
               self.op.mode = constants.REPLACE_DISK_SEC
             if self.op.mode == constants.REPLACE_DISK_ALL:
               raise errors.OpPrereqError("Template 'drbd' only allows primary or"
                                          " secondary disk replacement, not"
                                          " both at once")
             elif self.op.mode == constants.REPLACE_DISK_PRI:
               if remote_node is not None:
                 raise errors.OpPrereqError("Template 'drbd' does not allow changing"
                                            " the secondary while doing a primary"
                                            " node disk replacement")
               self.tgt_node = instance.primary_node
               self.oth_node = instance.secondary_nodes[0]
             elif self.op.mode == constants.REPLACE_DISK_SEC:
               self.new_node = remote_node # this can be None, in which case
                                           # we don't change the secondary
               self.tgt_node = instance.secondary_nodes[0]
               self.oth_node = instance.primary_node
             else:
               raise errors.ProgrammerError("Unhandled disk replace mode")
           for name in self.op.disks:
             if instance.FindDisk(name) is None:
               raise errors.OpPrereqError("Disk '%s' not found for instance '%s'" %
                                          (name, instance.name))
           self.op.remote_node = remote_node
         def _ExecD8DiskOnly(self, feedback_fn):
           """Replace a disk on the primary or secondary for dbrd8.
           The algorithm for replace is quite complicated:
             - for each disk to be replaced:
               - create new LVs on the target node with unique names
               - detach old LVs from the drbd device
               - rename old LVs to name_replaced.<time_t>
               - rename new LVs to old LVs
               - attach the new LVs (with the old names now) to the drbd device
             - wait for sync across all devices
             - for each modified disk:
               - remove old LVs (which have the name name_replaces.<time_t>)
           Failures are not very well handled.
           """
           steps_total = 6
           warning, info = (self.proc.LogWarning, self.proc.LogInfo)
           instance = self.instance
           iv_names = {}
           vgname = self.cfg.GetVGName()
           # start of work
           cfg = self.cfg
           tgt_node = self.tgt_node
           oth_node = self.oth_node
           # Step: check device activation
           self.proc.LogStep(1, steps_total, "check device existence")
           info("checking volume groups")
           my_vg = cfg.GetVGName()
           results = rpc.call_vg_list([oth_node, tgt_node])
           if not results:
             raise errors.OpExecError("Can't list volume groups on the nodes")
           for node in oth_node, tgt_node:
             res = results.get(node, False)
             if not res or my_vg not in res:
               raise errors.OpExecError("Volume group '%s' not found on %s" %
                                        (my_vg, node))
           for dev in instance.disks:
             if not dev.iv_name in self.op.disks:
               continue
             for node in tgt_node, oth_node:
               info("checking %s on %s" % (dev.iv_name, node))
               cfg.SetDiskID(dev, node)
               if not rpc.call_blockdev_find(node, dev):
                 raise errors.OpExecError("Can't find device %s on node %s" %
                                          (dev.iv_name, node))
           # Step: check other node consistency
           self.proc.LogStep(2, steps_total, "check peer consistency")
           for dev in instance.disks:
             if not dev.iv_name in self.op.disks:
               continue
             info("checking %s consistency on %s" % (dev.iv_name, oth_node))
             if not _CheckDiskConsistency(self.cfg, dev, oth_node,
                                          oth_node==instance.primary_node):
               raise errors.OpExecError("Peer node (%s) has degraded storage, unsafe"
                                        " to replace disks on this node (%s)" %
                                        (oth_node, tgt_node))
           # Step: create new storage
           self.proc.LogStep(3, steps_total, "allocate new storage")
           for dev in instance.disks:
             if not dev.iv_name in self.op.disks:
               continue
             size = dev.size
             cfg.SetDiskID(dev, tgt_node)
             lv_names = [".%s_%s" % (dev.iv_name, suf) for suf in ["data", "meta"]]
             names = _GenerateUniqueNames(cfg, lv_names)
             lv_data = objects.Disk(dev_type=constants.LD_LV, size=size,
                                    logical_id=(vgname, names[0]))
             lv_meta = objects.Disk(dev_type=constants.LD_LV, size=128,
                                    logical_id=(vgname, names[1]))
             new_lvs = [lv_data, lv_meta]
             old_lvs = dev.children
             iv_names[dev.iv_name] = (dev, old_lvs, new_lvs)
             info("creating new local storage on %s for %s" %
                  (tgt_node, dev.iv_name))
             # since we *always* want to create this LV, we use the
             # _Create...OnPrimary (which forces the creation), even if we
             # are talking about the secondary node
             for new_lv in new_lvs:
               if not _CreateBlockDevOnPrimary(cfg, tgt_node, instance, new_lv,
                                               _GetInstanceInfoText(instance)):
                 raise errors.OpExecError("Failed to create new LV named '%s' on"
                                          " node '%s'" %
                                          (new_lv.logical_id[1], tgt_node))
           # Step: for each lv, detach+rename*2+attach
           self.proc.LogStep(4, steps_total, "change drbd configuration")
           for dev, old_lvs, new_lvs in iv_names.itervalues():
             info("detaching %s drbd from local storage" % dev.iv_name)
             if not rpc.call_blockdev_removechildren(tgt_node, dev, old_lvs):
               raise errors.OpExecError("Can't detach drbd from local storage on node"
                                        " %s for device %s" % (tgt_node, dev.iv_name))
             #dev.children = []
             #cfg.Update(instance)
             # ok, we created the new LVs, so now we know we have the needed
             # storage; as such, we proceed on the target node to rename
             # old_lv to _old, and new_lv to old_lv; note that we rename LVs
             # using the assumption that logical_id == physical_id (which in
             # turn is the unique_id on that node)
             # FIXME(iustin): use a better name for the replaced LVs
             temp_suffix = int(time.time())
             ren_fn = lambda d, suff: (d.physical_id[0],
                                       d.physical_id[1] + "_replaced-%s" % suff)
             # build the rename list based on what LVs exist on the node
             rlist = []
             for to_ren in old_lvs:
               find_res = rpc.call_blockdev_find(tgt_node, to_ren)
               if find_res is not None: # device exists
                 rlist.append((to_ren, ren_fn(to_ren, temp_suffix)))
             info("renaming the old LVs on the target node")
             if not rpc.call_blockdev_rename(tgt_node, rlist):
               raise errors.OpExecError("Can't rename old LVs on node %s" % tgt_node)
             # now we rename the new LVs to the old LVs
             info("renaming the new LVs on the target node")
             rlist = [(new, old.physical_id) for old, new in zip(old_lvs, new_lvs)]
             if not rpc.call_blockdev_rename(tgt_node, rlist):
               raise errors.OpExecError("Can't rename new LVs on node %s" % tgt_node)
             for old, new in zip(old_lvs, new_lvs):
               new.logical_id = old.logical_id
               cfg.SetDiskID(new, tgt_node)
             for disk in old_lvs:
               disk.logical_id = ren_fn(disk, temp_suffix)
               cfg.SetDiskID(disk, tgt_node)
             # now that the new lvs have the old name, we can add them to the device
             info("adding new mirror component on %s" % tgt_node)
             if not rpc.call_blockdev_addchildren(tgt_node, dev, new_lvs):
               for new_lv in new_lvs:
                 if not rpc.call_blockdev_remove(tgt_node, new_lv):
                   warning("Can't rollback device %s", hint="manually cleanup unused"
                           " logical volumes")
               raise errors.OpExecError("Can't add local storage to drbd")
             dev.children = new_lvs
             cfg.Update(instance)
           # Step: wait for sync
           # this can fail as the old devices are degraded and _WaitForSync
           # does a combined result over all disks, so we don't check its
           # return value
           self.proc.LogStep(5, steps_total, "sync devices")
           _WaitForSync(cfg, instance, self.proc, unlock=True)
           # so check manually all the devices
           for name, (dev, old_lvs, new_lvs) in iv_names.iteritems():
             cfg.SetDiskID(dev, instance.primary_node)
             is_degr = rpc.call_blockdev_find(instance.primary_node, dev)[5]
             if is_degr:
               raise errors.OpExecError("DRBD device %s is degraded!" % name)
           # Step: remove old storage
           self.proc.LogStep(6, steps_total, "removing old storage")
           for name, (dev, old_lvs, new_lvs) in iv_names.iteritems():
             info("remove logical volumes for %s" % name)
             for lv in old_lvs:
               cfg.SetDiskID(lv, tgt_node)
               if not rpc.call_blockdev_remove(tgt_node, lv):
                 warning("Can't remove old LV", hint="manually remove unused LVs")
                 continue
         def _ExecD8Secondary(self, feedback_fn):
           """Replace the secondary node for drbd8.
           The algorithm for replace is quite complicated:
             - for all disks of the instance:
               - create new LVs on the new node with same names
               - shutdown the drbd device on the old secondary
               - disconnect the drbd network on the primary
               - create the drbd device on the new secondary
               - network attach the drbd on the primary, using an artifice:
                 the drbd code for Attach() will connect to the network if it
                 finds a device which is connected to the good local disks but
                 not network enabled
             - wait for sync across all devices
             - remove all disks from the old secondary
           Failures are not very well handled.
           """
           steps_total = 6
           warning, info = (self.proc.LogWarning, self.proc.LogInfo)
           instance = self.instance
           iv_names = {}
           vgname = self.cfg.GetVGName()
           # start of work
           cfg = self.cfg
           old_node = self.tgt_node
           new_node = self.new_node
           pri_node = instance.primary_node
           # Step: check device activation
           self.proc.LogStep(1, steps_total, "check device existence")
           info("checking volume groups")
           my_vg = cfg.GetVGName()
           results = rpc.call_vg_list([pri_node, new_node])
           if not results:
             raise errors.OpExecError("Can't list volume groups on the nodes")
           for node in pri_node, new_node:
             res = results.get(node, False)
             if not res or my_vg not in res:
               raise errors.OpExecError("Volume group '%s' not found on %s" %
                                        (my_vg, node))
           for dev in instance.disks:
             if not dev.iv_name in self.op.disks:
               continue
             info("checking %s on %s" % (dev.iv_name, pri_node))
             cfg.SetDiskID(dev, pri_node)
             if not rpc.call_blockdev_find(pri_node, dev):
               raise errors.OpExecError("Can't find device %s on node %s" %
                                        (dev.iv_name, pri_node))
           # Step: check other node consistency
           self.proc.LogStep(2, steps_total, "check peer consistency")
           for dev in instance.disks:
             if not dev.iv_name in self.op.disks:
               continue
             info("checking %s consistency on %s" % (dev.iv_name, pri_node))
             if not _CheckDiskConsistency(self.cfg, dev, pri_node, True, ldisk=True):
               raise errors.OpExecError("Primary node (%s) has degraded storage,"
                                        " unsafe to replace the secondary" %
                                        pri_node)
           # Step: create new storage
           self.proc.LogStep(3, steps_total, "allocate new storage")
           for dev in instance.disks:
             size = dev.size
             info("adding new local storage on %s for %s" % (new_node, dev.iv_name))
             # since we *always* want to create this LV, we use the
             # _Create...OnPrimary (which forces the creation), even if we
             # are talking about the secondary node
             for new_lv in dev.children:
               if not _CreateBlockDevOnPrimary(cfg, new_node, instance, new_lv,
                                               _GetInstanceInfoText(instance)):
                 raise errors.OpExecError("Failed to create new LV named '%s' on"
                                          " node '%s'" %
                                          (new_lv.logical_id[1], new_node))
             iv_names[dev.iv_name] = (dev, dev.children)
           self.proc.LogStep(4, steps_total, "changing drbd configuration")
           for dev in instance.disks:
             size = dev.size
             info("activating a new drbd on %s for %s" % (new_node, dev.iv_name))
             # create new devices on new_node
             new_drbd = objects.Disk(dev_type=constants.LD_DRBD8,
                                     logical_id=(pri_node, new_node,
                                                 dev.logical_id[2]),
                                     children=dev.children)
             if not _CreateBlockDevOnSecondary(cfg, new_node, instance,
                                               new_drbd, False,
                                             _GetInstanceInfoText(instance)):
               raise errors.OpExecError("Failed to create new DRBD on"
                                        " node '%s'" % new_node)
           for dev in instance.disks:
             # we have new devices, shutdown the drbd on the old secondary
             info("shutting down drbd for %s on old node" % dev.iv_name)
             cfg.SetDiskID(dev, old_node)
             if not rpc.call_blockdev_shutdown(old_node, dev):
               warning("Failed to shutdown drbd for %s on old node" % dev.iv_name,
                       hint="Please cleanup this device manually as soon as possible")
           info("detaching primary drbds from the network (=> standalone)")
           done = 0
           for dev in instance.disks:
             cfg.SetDiskID(dev, pri_node)
             # set the physical (unique in bdev terms) id to None, meaning
             # detach from network
             dev.physical_id = (None,) * len(dev.physical_id)
             # and 'find' the device, which will 'fix' it to match the
             # standalone state
             if rpc.call_blockdev_find(pri_node, dev):
               done += 1
             else:
               warning("Failed to detach drbd %s from network, unusual case" %
                       dev.iv_name)
           if not done:
             # no detaches succeeded (very unlikely)
             raise errors.OpExecError("Can't detach at least one DRBD from old node")
           # if we managed to detach at least one, we update all the disks of
           # the instance to point to the new secondary
           info("updating instance configuration")
           for dev in instance.disks:
             dev.logical_id = (pri_node, new_node) + dev.logical_id[2:]
             cfg.SetDiskID(dev, pri_node)
           cfg.Update(instance)
           # and now perform the drbd attach
           info("attaching primary drbds to new secondary (standalone => connected)")
           failures = []
           for dev in instance.disks:
             info("attaching primary drbd for %s to new secondary node" % dev.iv_name)
             # since the attach is smart, it's enough to 'find' the device,
             # it will automatically activate the network, if the physical_id
             # is correct
             cfg.SetDiskID(dev, pri_node)
             if not rpc.call_blockdev_find(pri_node, dev):
               warning("can't attach drbd %s to new secondary!" % dev.iv_name,
                       "please do a gnt-instance info to see the status of disks")
           # this can fail as the old devices are degraded and _WaitForSync
           # does a combined result over all disks, so we don't check its
           # return value
           self.proc.LogStep(5, steps_total, "sync devices")
           _WaitForSync(cfg, instance, self.proc, unlock=True)
           # so check manually all the devices
           for name, (dev, old_lvs) in iv_names.iteritems():
             cfg.SetDiskID(dev, pri_node)
             is_degr = rpc.call_blockdev_find(pri_node, dev)[5]
             if is_degr:
               raise errors.OpExecError("DRBD device %s is degraded!" % name)
           self.proc.LogStep(6, steps_total, "removing old storage")
           for name, (dev, old_lvs) in iv_names.iteritems():
             info("remove logical volumes for %s" % name)
             for lv in old_lvs:
               cfg.SetDiskID(lv, old_node)
               if not rpc.call_blockdev_remove(old_node, lv):
                 warning("Can't remove LV on old secondary",
                         hint="Cleanup stale volumes by hand")
         def Exec(self, feedback_fn):
           """Execute disk replacement.
           This dispatches the disk replacement to the appropriate handler.
           """
           instance = self.instance
           if instance.disk_template == constants.DT_DRBD8:
             if self.op.remote_node is None:
               fn = self._ExecD8DiskOnly
             else:
               fn = self._ExecD8Secondary
           else:
             raise errors.ProgrammerError("Unhandled disk replacement case")
           return fn(feedback_fn)
       class LUQueryInstanceData(NoHooksLU):
         """Query runtime instance data.
         """
         _OP_REQP = ["instances"]
         def CheckPrereq(self):
           """Check prerequisites.
           This only checks the optional instance list against the existing names.
           """
           if not isinstance(self.op.instances, list):
             raise errors.OpPrereqError("Invalid argument type 'instances'")
           if self.op.instances:
             self.wanted_instances = []
             names = self.op.instances
             for name in names:
               instance = self.cfg.GetInstanceInfo(self.cfg.ExpandInstanceName(name))
               if instance is None:
                 raise errors.OpPrereqError("No such instance name '%s'" % name)
               self.wanted_instances.append(instance)
           else:
             self.wanted_instances = [self.cfg.GetInstanceInfo(name) for name
                                      in self.cfg.GetInstanceList()]
           return
         def _ComputeDiskStatus(self, instance, snode, dev):
           """Compute block device status.
           """
           self.cfg.SetDiskID(dev, instance.primary_node)
           dev_pstatus = rpc.call_blockdev_find(instance.primary_node, dev)
           if dev.dev_type in constants.LDS_DRBD:
             # we change the snode then (otherwise we use the one passed in)
             if dev.logical_id[0] == instance.primary_node:
               snode = dev.logical_id[1]
             else:
               snode = dev.logical_id[0]
           if snode:
             self.cfg.SetDiskID(dev, snode)
             dev_sstatus = rpc.call_blockdev_find(snode, dev)
           else:
             dev_sstatus = None
           if dev.children:
             dev_children = [self._ComputeDiskStatus(instance, snode, child)
                             for child in dev.children]
           else:
             dev_children = []
           data = {
             "iv_name": dev.iv_name,
             "dev_type": dev.dev_type,
             "logical_id": dev.logical_id,
             "physical_id": dev.physical_id,
             "pstatus": dev_pstatus,
             "sstatus": dev_sstatus,
             "children": dev_children,
+            }
           return data
         def Exec(self, feedback_fn):
           """Gather and return data"""
           result = {}
           for instance in self.wanted_instances:
             remote_info = rpc.call_instance_info(instance.primary_node,
                                                       instance.name)
             if remote_info and "state" in remote_info:
               remote_state = "up"
             else:
               remote_state = "down"
             if instance.status == "down":
               config_state = "down"
             else:
               config_state = "up"
             disks = [self._ComputeDiskStatus(instance, None, device)
                      for device in instance.disks]
             idict = {
               "name": instance.name,
               "config_state": config_state,
               "run_state": remote_state,
               "pnode": instance.primary_node,
               "snodes": instance.secondary_nodes,
               "os": instance.os,
               "memory": instance.memory,
               "nics": [(nic.mac, nic.ip, nic.bridge) for nic in instance.nics],
               "disks": disks,
               "vcpus": instance.vcpus,
+              }
             htkind = self.sstore.GetHypervisorType()
             if htkind == constants.HT_XEN_PVM30:
               idict["kernel_path"] = instance.kernel_path
               idict["initrd_path"] = instance.initrd_path
             if htkind == constants.HT_XEN_HVM31:
               idict["hvm_boot_order"] = instance.hvm_boot_order
               idict["hvm_acpi"] = instance.hvm_acpi
               idict["hvm_pae"] = instance.hvm_pae
               idict["hvm_cdrom_image_path"] = instance.hvm_cdrom_image_path
             if htkind in constants.HTS_REQ_PORT:
               idict["vnc_bind_address"] = instance.vnc_bind_address
               idict["network_port"] = instance.network_port
             result[instance.name] = idict
           return result
       class LUSetInstanceParams(LogicalUnit):
         """Modifies an instances's parameters.
         """
         HPATH = "instance-modify"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_REQP = ["instance_name"]
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on the master, primary and secondaries.
           """
           args = dict()
           if self.mem:
             args['memory'] = self.mem
           if self.vcpus:
             args['vcpus'] = self.vcpus
           if self.do_ip or self.do_bridge or self.mac:
             if self.do_ip:
               ip = self.ip
             else:
               ip = self.instance.nics[0].ip
             if self.bridge:
               bridge = self.bridge
             else:
               bridge = self.instance.nics[0].bridge
             if self.mac:
               mac = self.mac
             else:
               mac = self.instance.nics[0].mac
             args['nics'] = [(ip, bridge, mac)]
           env = _BuildInstanceHookEnvByObject(self.instance, override=args)
           nl = [self.sstore.GetMasterNode(),
                 self.instance.primary_node] + list(self.instance.secondary_nodes)
           return env, nl, nl
         def CheckPrereq(self):
           """Check prerequisites.
           This only checks the instance list against the existing names.
           """
           self.mem = getattr(self.op, "mem", None)
           self.vcpus = getattr(self.op, "vcpus", None)
           self.ip = getattr(self.op, "ip", None)
           self.mac = getattr(self.op, "mac", None)
           self.bridge = getattr(self.op, "bridge", None)
           self.kernel_path = getattr(self.op, "kernel_path", None)
           self.initrd_path = getattr(self.op, "initrd_path", None)
           self.hvm_boot_order = getattr(self.op, "hvm_boot_order", None)
           self.hvm_acpi = getattr(self.op, "hvm_acpi", None)
           self.hvm_pae = getattr(self.op, "hvm_pae", None)
           self.hvm_cdrom_image_path = getattr(self.op, "hvm_cdrom_image_path", None)
           self.vnc_bind_address = getattr(self.op, "vnc_bind_address", None)
           all_parms = [self.mem, self.vcpus, self.ip, self.bridge, self.mac,
                        self.kernel_path, self.initrd_path, self.hvm_boot_order,
                        self.hvm_acpi, self.hvm_pae, self.hvm_cdrom_image_path,
                        self.vnc_bind_address]
           if all_parms.count(None) == len(all_parms):
             raise errors.OpPrereqError("No changes submitted")
           if self.mem is not None:
             try:
               self.mem = int(self.mem)
             except ValueError, err:
               raise errors.OpPrereqError("Invalid memory size: %s" % str(err))
           if self.vcpus is not None:
             try:
               self.vcpus = int(self.vcpus)
             except ValueError, err:
               raise errors.OpPrereqError("Invalid vcpus number: %s" % str(err))
           if self.ip is not None:
             self.do_ip = True
             if self.ip.lower() == "none":
               self.ip = None
             else:
               if not utils.IsValidIP(self.ip):
                 raise errors.OpPrereqError("Invalid IP address '%s'." % self.ip)
           else:
             self.do_ip = False
           self.do_bridge = (self.bridge is not None)
           if self.mac is not None:
             if self.cfg.IsMacInUse(self.mac):
               raise errors.OpPrereqError('MAC address %s already in use in cluster' %
                                          self.mac)
             if not utils.IsValidMac(self.mac):
               raise errors.OpPrereqError('Invalid MAC address %s' % self.mac)
           if self.kernel_path is not None:
             self.do_kernel_path = True
             if self.kernel_path == constants.VALUE_NONE:
               raise errors.OpPrereqError("Can't set instance to no kernel")
             if self.kernel_path != constants.VALUE_DEFAULT:
               if not os.path.isabs(self.kernel_path):
                 raise errors.OpPrereqError("The kernel path must be an absolute"
                                           " filename")
           else:
             self.do_kernel_path = False
           if self.initrd_path is not None:
             self.do_initrd_path = True
             if self.initrd_path not in (constants.VALUE_NONE,
                                         constants.VALUE_DEFAULT):
               if not os.path.isabs(self.initrd_path):
                 raise errors.OpPrereqError("The initrd path must be an absolute"
                                           " filename")
           else:
             self.do_initrd_path = False
           # boot order verification
           if self.hvm_boot_order is not None:
             if self.hvm_boot_order != constants.VALUE_DEFAULT:
               if len(self.hvm_boot_order.strip("acdn")) != 0:
                 raise errors.OpPrereqError("invalid boot order specified,"
                                            " must be one or more of [acdn]"
                                            " or 'default'")
           # hvm_cdrom_image_path verification
           if self.op.hvm_cdrom_image_path is not None:
             if not os.path.isabs(self.op.hvm_cdrom_image_path):
               raise errors.OpPrereqError("The path to the HVM CDROM image must"
                                          " be an absolute path or None, not %s" %
                                          self.op.hvm_cdrom_image_path)
             if not os.path.isfile(self.op.hvm_cdrom_image_path):
               raise errors.OpPrereqError("The HVM CDROM image must either be a"
                                          " regular file or a symlink pointing to"
                                          " an existing regular file, not %s" %
                                          self.op.hvm_cdrom_image_path)
           # vnc_bind_address verification
           if self.op.vnc_bind_address is not None:
             if not utils.IsValidIP(self.op.vnc_bind_address):
               raise errors.OpPrereqError("given VNC bind address '%s' doesn't look"
                                          " like a valid IP address" %
                                          self.op.vnc_bind_address)
           instance = self.cfg.GetInstanceInfo(
             self.cfg.ExpandInstanceName(self.op.instance_name))
           if instance is None:
             raise errors.OpPrereqError("No such instance name '%s'" %
                                        self.op.instance_name)
           self.op.instance_name = instance.name
           self.instance = instance
           return
         def Exec(self, feedback_fn):
           """Modifies an instance.
           All parameters take effect only at the next restart of the instance.
           """
           result = []
           instance = self.instance
           if self.mem:
             instance.memory = self.mem
             result.append(("mem", self.mem))
           if self.vcpus:
             instance.vcpus = self.vcpus
             result.append(("vcpus",  self.vcpus))
           if self.do_ip:
             instance.nics[0].ip = self.ip
             result.append(("ip", self.ip))
           if self.bridge:
             instance.nics[0].bridge = self.bridge
             result.append(("bridge", self.bridge))
           if self.mac:
             instance.nics[0].mac = self.mac
             result.append(("mac", self.mac))
           if self.do_kernel_path:
             instance.kernel_path = self.kernel_path
             result.append(("kernel_path", self.kernel_path))
           if self.do_initrd_path:
             instance.initrd_path = self.initrd_path
             result.append(("initrd_path", self.initrd_path))
           if self.hvm_boot_order:
             if self.hvm_boot_order == constants.VALUE_DEFAULT:
               instance.hvm_boot_order = None
             else:
               instance.hvm_boot_order = self.hvm_boot_order
             result.append(("hvm_boot_order", self.hvm_boot_order))
           if self.hvm_acpi:
             instance.hvm_acpi = self.hvm_acpi
             result.append(("hvm_acpi", self.hvm_acpi))
           if self.hvm_pae:
             instance.hvm_pae = self.hvm_pae
             result.append(("hvm_pae", self.hvm_pae))
           if self.hvm_cdrom_image_path:
             instance.hvm_cdrom_image_path = self.hvm_cdrom_image_path
             result.append(("hvm_cdrom_image_path", self.hvm_cdrom_image_path))
           if self.vnc_bind_address:
             instance.vnc_bind_address = self.vnc_bind_address
             result.append(("vnc_bind_address", self.vnc_bind_address))
           self.cfg.AddInstance(instance)
           return result
       class LUQueryExports(NoHooksLU):
         """Query the exports list
         """
         _OP_REQP = []
         def CheckPrereq(self):
           """Check that the nodelist contains only existing nodes.
           """
           self.nodes = _GetWantedNodes(self, getattr(self.op, "nodes", None))
         def Exec(self, feedback_fn):
           """Compute the list of all the exported system images.
           Returns:
             a dictionary with the structure node->(export-list)
             where export-list is a list of the instances exported on
             that node.
           """
           return rpc.call_export_list(self.nodes)
       class LUExportInstance(LogicalUnit):
         """Export an instance to an image in the cluster.
         """
         HPATH = "instance-export"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_REQP = ["instance_name", "target_node", "shutdown"]
         def BuildHooksEnv(self):
           """Build hooks env.
           This will run on the master, primary node and target node.
           """
           env = {
             "EXPORT_NODE": self.op.target_node,
             "EXPORT_DO_SHUTDOWN": self.op.shutdown,
+            }
           env.update(_BuildInstanceHookEnvByObject(self.instance))
           nl = [self.sstore.GetMasterNode(), self.instance.primary_node,
                 self.op.target_node]
           return env, nl, nl
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the instance and node names are valid.
           """
           instance_name = self.cfg.ExpandInstanceName(self.op.instance_name)
           self.instance = self.cfg.GetInstanceInfo(instance_name)
           if self.instance is None:
             raise errors.OpPrereqError("Instance '%s' not found" %
                                        self.op.instance_name)
           # node verification
           dst_node_short = self.cfg.ExpandNodeName(self.op.target_node)
           self.dst_node = self.cfg.GetNodeInfo(dst_node_short)
           if self.dst_node is None:
             raise errors.OpPrereqError("Destination node '%s' is unknown." %
                                        self.op.target_node)
           self.op.target_node = self.dst_node.name
           # instance disk type verification
           for disk in self.instance.disks:
             if disk.dev_type == constants.LD_FILE:
               raise errors.OpPrereqError("Export not supported for instances with"
                                          " file-based disks")
         def Exec(self, feedback_fn):
           """Export an instance to an image in the cluster.
           """
           instance = self.instance
           dst_node = self.dst_node
           src_node = instance.primary_node
           if self.op.shutdown:
             # shutdown the instance, but not the disks
             if not rpc.call_instance_shutdown(src_node, instance):
                raise errors.OpExecError("Could not shutdown instance %s on node %s" %
                                         (instance.name, src_node))
           vgname = self.cfg.GetVGName()
           snap_disks = []
           try:
             for disk in instance.disks:
               if disk.iv_name == "sda":
                 # new_dev_name will be a snapshot of an lvm leaf of the one we passed
                 new_dev_name = rpc.call_blockdev_snapshot(src_node, disk)
                 if not new_dev_name:
                   logger.Error("could not snapshot block device %s on node %s" %
                                (disk.logical_id[1], src_node))
                 else:
                   new_dev = objects.Disk(dev_type=constants.LD_LV, size=disk.size,
                                             logical_id=(vgname, new_dev_name),
                                             physical_id=(vgname, new_dev_name),
                                             iv_name=disk.iv_name)
                   snap_disks.append(new_dev)
           finally:
             if self.op.shutdown and instance.status == "up":
               if not rpc.call_instance_start(src_node, instance, None):
                 _ShutdownInstanceDisks(instance, self.cfg)
                 raise errors.OpExecError("Could not start instance")
           # TODO: check for size
           for dev in snap_disks:
             if not rpc.call_snapshot_export(src_node, dev, dst_node.name, instance):
               logger.Error("could not export block device %s from node %s to node %s"
                            % (dev.logical_id[1], src_node, dst_node.name))
             if not rpc.call_blockdev_remove(src_node, dev):
               logger.Error("could not remove snapshot block device %s from node %s" %
                            (dev.logical_id[1], src_node))
           if not rpc.call_finalize_export(dst_node.name, instance, snap_disks):
             logger.Error("could not finalize export for instance %s on node %s" %
                          (instance.name, dst_node.name))
           nodelist = self.cfg.GetNodeList()
           nodelist.remove(dst_node.name)
           # on one-node clusters nodelist will be empty after the removal
           # if we proceed the backup would be removed because OpQueryExports
           # substitutes an empty list with the full cluster node list.
           if nodelist:
             op = opcodes.OpQueryExports(nodes=nodelist)
             exportlist = self.proc.ChainOpCode(op)
             for node in exportlist:
               if instance.name in exportlist[node]:
                 if not rpc.call_export_remove(node, instance.name):
                   logger.Error("could not remove older export for instance %s"
                                " on node %s" % (instance.name, node))
       class LURemoveExport(NoHooksLU):
         """Remove exports related to the named instance.
         """
         _OP_REQP = ["instance_name"]
         def CheckPrereq(self):
           """Check prerequisites.
           """
           pass
         def Exec(self, feedback_fn):
           """Remove any export.
           """
           instance_name = self.cfg.ExpandInstanceName(self.op.instance_name)
           # If the instance was not found we'll try with the name that was passed in.
           # This will only work if it was an FQDN, though.
           fqdn_warn = False
           if not instance_name:
             fqdn_warn = True
             instance_name = self.op.instance_name
           op = opcodes.OpQueryExports(nodes=[])
           exportlist = self.proc.ChainOpCode(op)
           found = False
           for node in exportlist:
             if instance_name in exportlist[node]:
               found = True
               if not rpc.call_export_remove(node, instance_name):
                 logger.Error("could not remove export for instance %s"
                              " on node %s" % (instance_name, node))
           if fqdn_warn and not found:
             feedback_fn("Export not found. If trying to remove an export belonging"
                         " to a deleted instance please use its Fully Qualified"
                         " Domain Name.")
       class TagsLU(NoHooksLU):
         """Generic tags LU.
         This is an abstract class which is the parent of all the other tags LUs.
         """
         def CheckPrereq(self):
           """Check prerequisites.
           """
           if self.op.kind == constants.TAG_CLUSTER:
             self.target = self.cfg.GetClusterInfo()
           elif self.op.kind == constants.TAG_NODE:
             name = self.cfg.ExpandNodeName(self.op.name)
             if name is None:
               raise errors.OpPrereqError("Invalid node name (%s)" %
                                          (self.op.name,))
             self.op.name = name
             self.target = self.cfg.GetNodeInfo(name)
           elif self.op.kind == constants.TAG_INSTANCE:
             name = self.cfg.ExpandInstanceName(self.op.name)
             if name is None:
               raise errors.OpPrereqError("Invalid instance name (%s)" %
                                          (self.op.name,))
             self.op.name = name
             self.target = self.cfg.GetInstanceInfo(name)
           else:
             raise errors.OpPrereqError("Wrong tag type requested (%s)" %
                                        str(self.op.kind))
       class LUGetTags(TagsLU):
         """Returns the tags of a given object.
         """
         _OP_REQP = ["kind", "name"]
         def Exec(self, feedback_fn):
           """Returns the tag list.
           """
           return self.target.GetTags()
       class LUSearchTags(NoHooksLU):
         """Searches the tags for a given pattern.
         """
         _OP_REQP = ["pattern"]
         def CheckPrereq(self):
           """Check prerequisites.
           This checks the pattern passed for validity by compiling it.
           """
           try:
             self.re = re.compile(self.op.pattern)
           except re.error, err:
             raise errors.OpPrereqError("Invalid search pattern '%s': %s" %
                                        (self.op.pattern, err))
         def Exec(self, feedback_fn):
           """Returns the tag list.
           """
           cfg = self.cfg
           tgts = [("/cluster", cfg.GetClusterInfo())]
           ilist = [cfg.GetInstanceInfo(name) for name in cfg.GetInstanceList()]
           tgts.extend([("/instances/%s" % i.name, i) for i in ilist])
           nlist = [cfg.GetNodeInfo(name) for name in cfg.GetNodeList()]
           tgts.extend([("/nodes/%s" % n.name, n) for n in nlist])
           results = []
           for path, target in tgts:
             for tag in target.GetTags():
               if self.re.search(tag):
                 results.append((path, tag))
           return results
       class LUAddTags(TagsLU):
         """Sets a tag on a given object.
         """
         _OP_REQP = ["kind", "name", "tags"]
         def CheckPrereq(self):
           """Check prerequisites.
           This checks the type and length of the tag name and value.
           """
           TagsLU.CheckPrereq(self)
           for tag in self.op.tags:
             objects.TaggableObject.ValidateTag(tag)
         def Exec(self, feedback_fn):
           """Sets the tag.
           """
           try:
             for tag in self.op.tags:
               self.target.AddTag(tag)
           except errors.TagError, err:
             raise errors.OpExecError("Error while setting tag: %s" % str(err))
           try:
             self.cfg.Update(self.target)
           except errors.ConfigurationError:
             raise errors.OpRetryError("There has been a modification to the"
                                       " config file and the operation has been"
                                       " aborted. Please retry.")
       class LUDelTags(TagsLU):
         """Delete a list of tags from a given object.
         """
         _OP_REQP = ["kind", "name", "tags"]
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that we have the given tag.
           """
           TagsLU.CheckPrereq(self)
           for tag in self.op.tags:
             objects.TaggableObject.ValidateTag(tag)
           del_tags = frozenset(self.op.tags)
           cur_tags = self.target.GetTags()
           if not del_tags <= cur_tags:
             diff_tags = del_tags - cur_tags
             diff_names = ["'%s'" % tag for tag in diff_tags]
             diff_names.sort()
             raise errors.OpPrereqError("Tag(s) %s not found" %
                                        (",".join(diff_names)))
         def Exec(self, feedback_fn):
           """Remove the tag from the object.
           """
           for tag in self.op.tags:
             self.target.RemoveTag(tag)
           try:
             self.cfg.Update(self.target)
           except errors.ConfigurationError:
             raise errors.OpRetryError("There has been a modification to the"
                                       " config file and the operation has been"
                                       " aborted. Please retry.")
       class LUTestDelay(NoHooksLU):
         """Sleep for a specified amount of time.
         This LU sleeps on the master and/or nodes for a specified amoutn of
         time.
         """
         _OP_REQP = ["duration", "on_master", "on_nodes"]
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that we have a good list of nodes and/or the duration
           is valid.
           """
           if self.op.on_nodes:
             self.op.on_nodes = _GetWantedNodes(self, self.op.on_nodes)
         def Exec(self, feedback_fn):
           """Do the actual sleep.
           """
           if self.op.on_master:
             if not utils.TestDelay(self.op.duration):
               raise errors.OpExecError("Error during master delay test")
           if self.op.on_nodes:
             result = rpc.call_test_delay(self.op.on_nodes, self.op.duration)
             if not result:
               raise errors.OpExecError("Complete failure from rpc call")
             for node, node_result in result.items():
               if not node_result:
                 raise errors.OpExecError("Failure during rpc call to node %s,"
                                          " result: %s" % (node, node_result))
       class IAllocator(object):
         """IAllocator framework.
         An IAllocator instance has three sets of attributes:
           - cfg/sstore that are needed to query the cluster
           - input data (all members of the _KEYS class attribute are required)
           - four buffer attributes (in|out_data|text), that represent the
             input (to the external script) in text and data structure format,
             and the output from it, again in two formats
           - the result variables from the script (success, info, nodes) for
             easy usage
         """
         _ALLO_KEYS = [
           "mem_size", "disks", "disk_template",
           "os", "tags", "nics", "vcpus",
+          ]
         _RELO_KEYS = [
           "relocate_from",
+          ]
         def __init__(self, cfg, sstore, mode, name, **kwargs):
           self.cfg = cfg
           self.sstore = sstore
           # init buffer variables
           self.in_text = self.out_text = self.in_data = self.out_data = None
           # init all input fields so that pylint is happy
           self.mode = mode
           self.name = name
           self.mem_size = self.disks = self.disk_template = None
           self.os = self.tags = self.nics = self.vcpus = None
           self.relocate_from = None
           # computed fields
           self.required_nodes = None
           # init result fields
           self.success = self.info = self.nodes = None
           if self.mode == constants.IALLOCATOR_MODE_ALLOC:
             keyset = self._ALLO_KEYS
           elif self.mode == constants.IALLOCATOR_MODE_RELOC:
             keyset = self._RELO_KEYS
           else:
             raise errors.ProgrammerError("Unknown mode '%s' passed to the"
                                          " IAllocator" % self.mode)
           for key in kwargs:
             if key not in keyset:
               raise errors.ProgrammerError("Invalid input parameter '%s' to"
                                            " IAllocator" % key)
             setattr(self, key, kwargs[key])
           for key in keyset:
             if key not in kwargs:
               raise errors.ProgrammerError("Missing input parameter '%s' to"
                                            " IAllocator" % key)
           self._BuildInputData()
         def _ComputeClusterData(self):
           """Compute the generic allocator input data.
           This is the data that is independent of the actual operation.
           """
           cfg = self.cfg
           # cluster data
           data = {
             "version": 1,
             "cluster_name": self.sstore.GetClusterName(),
             "cluster_tags": list(cfg.GetClusterInfo().GetTags()),
             "hypervisor_type": self.sstore.GetHypervisorType(),
             # we don't have job IDs
+            }
           i_list = [cfg.GetInstanceInfo(iname) for iname in cfg.GetInstanceList()]
           # node data
           node_results = {}
           node_list = cfg.GetNodeList()
           node_data = rpc.call_node_info(node_list, cfg.GetVGName())
           for nname in node_list:
             ninfo = cfg.GetNodeInfo(nname)
             if nname not in node_data or not isinstance(node_data[nname], dict):
               raise errors.OpExecError("Can't get data for node %s" % nname)
             remote_info = node_data[nname]
             for attr in ['memory_total', 'memory_free', 'memory_dom0',
                          'vg_size', 'vg_free', 'cpu_total']:
               if attr not in remote_info:
                 raise errors.OpExecError("Node '%s' didn't return attribute '%s'" %
                                          (nname, attr))
               try:
                 remote_info[attr] = int(remote_info[attr])
               except ValueError, err:
                 raise errors.OpExecError("Node '%s' returned invalid value for '%s':"
                                          " %s" % (nname, attr, str(err)))
             # compute memory used by primary instances
             i_p_mem = i_p_up_mem = 0
             for iinfo in i_list:
               if iinfo.primary_node == nname:
                 i_p_mem += iinfo.memory
                 if iinfo.status == "up":
                   i_p_up_mem += iinfo.memory
             # compute memory used by instances
             pnr = {
               "tags": list(ninfo.GetTags()),
               "total_memory": remote_info['memory_total'],
               "reserved_memory": remote_info['memory_dom0'],
               "free_memory": remote_info['memory_free'],
               "i_pri_memory": i_p_mem,
               "i_pri_up_memory": i_p_up_mem,
               "total_disk": remote_info['vg_size'],
               "free_disk": remote_info['vg_free'],
               "primary_ip": ninfo.primary_ip,
               "secondary_ip": ninfo.secondary_ip,
               "total_cpus": remote_info['cpu_total'],
+              }
             node_results[nname] = pnr
           data["nodes"] = node_results
           # instance data
           instance_data = {}
           for iinfo in i_list:
             nic_data = [{"mac": n.mac, "ip": n.ip, "bridge": n.bridge}
                         for n in iinfo.nics]
             pir = {
               "tags": list(iinfo.GetTags()),
               "should_run": iinfo.status == "up",
               "vcpus": iinfo.vcpus,
               "memory": iinfo.memory,
               "os": iinfo.os,
               "nodes": [iinfo.primary_node] + list(iinfo.secondary_nodes),
               "nics": nic_data,
               "disks": [{"size": dsk.size, "mode": "w"} for dsk in iinfo.disks],
               "disk_template": iinfo.disk_template,
+              }
             instance_data[iinfo.name] = pir
           data["instances"] = instance_data
           self.in_data = data
         def _AddNewInstance(self):
           """Add new instance data to allocator structure.
           This in combination with _AllocatorGetClusterData will create the
           correct structure needed as input for the allocator.
           The checks for the completeness of the opcode must have already been
           done.
           """
           data = self.in_data
           if len(self.disks) != 2:
             raise errors.OpExecError("Only two-disk configurations supported")
           disk_space = _ComputeDiskSize(self.disk_template,
                                         self.disks[0]["size"], self.disks[1]["size"])
           if self.disk_template in constants.DTS_NET_MIRROR:
             self.required_nodes = 2
           else:
             self.required_nodes = 1
           request = {
             "type": "allocate",
             "name": self.name,
             "disk_template": self.disk_template,
             "tags": self.tags,
             "os": self.os,
             "vcpus": self.vcpus,
             "memory": self.mem_size,
             "disks": self.disks,
             "disk_space_total": disk_space,
             "nics": self.nics,
             "required_nodes": self.required_nodes,
+            }
           data["request"] = request
         def _AddRelocateInstance(self):
           """Add relocate instance data to allocator structure.
           This in combination with _IAllocatorGetClusterData will create the
           correct structure needed as input for the allocator.
           The checks for the completeness of the opcode must have already been
           done.
           """
           instance = self.cfg.GetInstanceInfo(self.name)
           if instance is None:
             raise errors.ProgrammerError("Unknown instance '%s' passed to"
                                          " IAllocator" % self.name)
           if instance.disk_template not in constants.DTS_NET_MIRROR:
             raise errors.OpPrereqError("Can't relocate non-mirrored instances")
           if len(instance.secondary_nodes) != 1:
             raise errors.OpPrereqError("Instance has not exactly one secondary node")
           self.required_nodes = 1
           disk_space = _ComputeDiskSize(instance.disk_template,
                                         instance.disks[0].size,
                                         instance.disks[1].size)
           request = {
             "type": "relocate",
             "name": self.name,
             "disk_space_total": disk_space,
             "required_nodes": self.required_nodes,
             "relocate_from": self.relocate_from,
+            }
           self.in_data["request"] = request
         def _BuildInputData(self):
           """Build input data structures.
           """
           self._ComputeClusterData()
           if self.mode == constants.IALLOCATOR_MODE_ALLOC:
             self._AddNewInstance()
           else:
             self._AddRelocateInstance()
           self.in_text = serializer.Dump(self.in_data)
         def Run(self, name, validate=True, call_fn=rpc.call_iallocator_runner):
           """Run an instance allocator and return the results.
           """
           data = self.in_text
           result = call_fn(self.sstore.GetMasterNode(), name, self.in_text)
           if not isinstance(result, tuple) or len(result) != 4:
             raise errors.OpExecError("Invalid result from master iallocator runner")
           rcode, stdout, stderr, fail = result
           if rcode == constants.IARUN_NOTFOUND:
             raise errors.OpExecError("Can't find allocator '%s'" % name)
           elif rcode == constants.IARUN_FAILURE:
               raise errors.OpExecError("Instance allocator call failed: %s,"
                                        " output: %s" %
                                        (fail, stdout+stderr))
           self.out_text = stdout
           if validate:
             self._ValidateResult()
         def _ValidateResult(self):
           """Process the allocator results.
           This will process and if successful save the result in
           self.out_data and the other parameters.
           """
           try:
             rdict = serializer.Load(self.out_text)
           except Exception, err:
             raise errors.OpExecError("Can't parse iallocator results: %s" % str(err))
           if not isinstance(rdict, dict):
             raise errors.OpExecError("Can't parse iallocator results: not a dict")
           for key in "success", "info", "nodes":
             if key not in rdict:
               raise errors.OpExecError("Can't parse iallocator results:"
                                        " missing key '%s'" % key)
             setattr(self, key, rdict[key])
           if not isinstance(rdict["nodes"], list):
             raise errors.OpExecError("Can't parse iallocator results: 'nodes' key"
                                      " is not a list")
           self.out_data = rdict
       class LUTestAllocator(NoHooksLU):
         """Run allocator tests.
         This LU runs the allocator tests
         """
         _OP_REQP = ["direction", "mode", "name"]
         def CheckPrereq(self):
           """Check prerequisites.
           This checks the opcode parameters depending on the director and mode test.
           """
           if self.op.mode == constants.IALLOCATOR_MODE_ALLOC:
             for attr in ["name", "mem_size", "disks", "disk_template",
                          "os", "tags", "nics", "vcpus"]:
               if not hasattr(self.op, attr):
                 raise errors.OpPrereqError("Missing attribute '%s' on opcode input" %
                                            attr)
             iname = self.cfg.ExpandInstanceName(self.op.name)
             if iname is not None:
               raise errors.OpPrereqError("Instance '%s' already in the cluster" %
                                          iname)
             if not isinstance(self.op.nics, list):
               raise errors.OpPrereqError("Invalid parameter 'nics'")
             for row in self.op.nics:
               if (not isinstance(row, dict) or
                   "mac" not in row or
                   "ip" not in row or
                   "bridge" not in row):
                 raise errors.OpPrereqError("Invalid contents of the"
                                            " 'nics' parameter")
             if not isinstance(self.op.disks, list):
               raise errors.OpPrereqError("Invalid parameter 'disks'")
             if len(self.op.disks) != 2:
               raise errors.OpPrereqError("Only two-disk configurations supported")
             for row in self.op.disks:
               if (not isinstance(row, dict) or
                   "size" not in row or
                   not isinstance(row["size"], int) or
                   "mode" not in row or
                   row["mode"] not in ['r', 'w']):
                 raise errors.OpPrereqError("Invalid contents of the"
                                            " 'disks' parameter")
           elif self.op.mode == constants.IALLOCATOR_MODE_RELOC:
             if not hasattr(self.op, "name"):
               raise errors.OpPrereqError("Missing attribute 'name' on opcode input")
             fname = self.cfg.ExpandInstanceName(self.op.name)
             if fname is None:
               raise errors.OpPrereqError("Instance '%s' not found for relocation" %
                                          self.op.name)
             self.op.name = fname
             self.relocate_from = self.cfg.GetInstanceInfo(fname).secondary_nodes
           else:
             raise errors.OpPrereqError("Invalid test allocator mode '%s'" %
                                        self.op.mode)
           if self.op.direction == constants.IALLOCATOR_DIR_OUT:
             if not hasattr(self.op, "allocator") or self.op.allocator is None:
               raise errors.OpPrereqError("Missing allocator name")
           elif self.op.direction != constants.IALLOCATOR_DIR_IN:
             raise errors.OpPrereqError("Wrong allocator test '%s'" %
                                        self.op.direction)
         def Exec(self, feedback_fn):
           """Run the allocator test.
           """
           if self.op.mode == constants.IALLOCATOR_MODE_ALLOC:
             ial = IAllocator(self.cfg, self.sstore,
                              mode=self.op.mode,
                              name=self.op.name,
                              mem_size=self.op.mem_size,
                              disks=self.op.disks,
                              disk_template=self.op.disk_template,
                              os=self.op.os,
                              tags=self.op.tags,
                              nics=self.op.nics,
                              vcpus=self.op.vcpus,
+                             )
           else:
             ial = IAllocator(self.cfg, self.sstore,
                              mode=self.op.mode,
                              name=self.op.name,
                              relocate_from=list(self.relocate_from),
+                             )
           if self.op.direction == constants.IALLOCATOR_DIR_IN:
             result = ial.in_text
           else:
             ial.Run(self.op.allocator, validate=False)
             result = ial.out_text
           return result

Synnefo » snf-ganeti

root / lib / cmdlib.py @ c6d58a2b