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

| Branch: | Tag: | Revision:

root / lib / cmdlib.py @ 2a710df1

History | View | Annotate | Download (116.2 kB)

       #!/usr/bin/python
+      #
       # Copyright (C) 2006, 2007 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 socket
       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
       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_CLUSTER,
             REQ_MASTER); note that all commands require root permissions
         """
         HPATH = None
         HTYPE = None
         _OP_REQP = []
         REQ_CLUSTER = True
         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.processor = processor
           self.op = op
           self.cfg = cfg
           self.sstore = sstore
           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 self.REQ_CLUSTER:
             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 != socket.gethostname():
                 raise errors.OpPrereqError("Commands must be run on the master"
                                            " node %s" % master)
         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.
           As for the node lists, the master should not be included in the
           them, as it will be added by the hooks runner in case this LU
           requires a cluster to run on (otherwise we don't have a node
           list). 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
       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 BuildHooksEnv(self):
           """Build hooks env.
           This is a no-op, since we don't run hooks.
           """
           return
       def _GetWantedNodes(lu, nodes):
         """Returns list of checked and expanded nodes.
         Args:
           nodes: List of nodes (strings) or None for all
         """
         if nodes is not None and not isinstance(nodes, list):
           raise errors.OpPrereqError("Invalid argument type 'nodes'")
         if nodes:
           wanted_nodes = []
           for name in nodes:
             node = lu.cfg.GetNodeInfo(lu.cfg.ExpandNodeName(name))
             if node is None:
               raise errors.OpPrereqError("No such node name '%s'" % name)
           wanted_nodes.append(node)
           return wanted_nodes
         else:
           return [lu.cfg.GetNodeInfo(name) for name in lu.cfg.GetNodeList()]
       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 = {
           "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) in enumerate(nics):
             if ip is None:
               ip = ""
             env["INSTANCE_NIC%d_IP" % idx] = ip
             env["INSTANCE_NIC%d_BRIDGE" % idx] = bridge
         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) for nic in instance.nics],
+        }
         if override:
           args.update(override)
         return _BuildInstanceHookEnv(**args)
       def _UpdateEtcHosts(fullnode, ip):
         """Ensure a node has a correct entry in /etc/hosts.
         Args:
           fullnode - Fully qualified domain name of host. (str)
           ip       - IPv4 address of host (str)
         """
         node = fullnode.split(".", 1)[0]
         f = open('/etc/hosts', 'r+')
         inthere = False
         save_lines = []
         add_lines = []
         removed = False
         while True:
           rawline = f.readline()
           if not rawline:
             # End of file
             break
           line = rawline.split('\n')[0]
           # Strip off comments
           line = line.split('#')[0]
           if not line:
             # Entire line was comment, skip
             save_lines.append(rawline)
             continue
           fields = line.split()
           haveall = True
           havesome = False
           for spec in [ ip, fullnode, node ]:
             if spec not in fields:
               haveall = False
             if spec in fields:
               havesome = True
           if haveall:
             inthere = True
             save_lines.append(rawline)
             continue
           if havesome and not haveall:
             # Line (old, or manual?) which is missing some.  Remove.
             removed = True
             continue
           save_lines.append(rawline)
         if not inthere:
           add_lines.append('%s\t%s %s\n' % (ip, fullnode, node))
         if removed:
           if add_lines:
             save_lines = save_lines + add_lines
           # We removed a line, write a new file and replace old.
           fd, tmpname = tempfile.mkstemp('tmp', 'hosts_', '/etc')
           newfile = os.fdopen(fd, 'w')
           newfile.write(''.join(save_lines))
           newfile.close()
           os.rename(tmpname, '/etc/hosts')
         elif add_lines:
           # Simply appending a new line will do the trick.
           f.seek(0, 2)
           for add in add_lines:
             f.write(add)
         f.close()
       def _UpdateKnownHosts(fullnode, ip, pubkey):
         """Ensure a node has a correct known_hosts entry.
         Args:
           fullnode - Fully qualified domain name of host. (str)
           ip       - IPv4 address of host (str)
           pubkey   - the public key of the cluster
         """
         if os.path.exists(constants.SSH_KNOWN_HOSTS_FILE):
           f = open(constants.SSH_KNOWN_HOSTS_FILE, 'r+')
         else:
           f = open(constants.SSH_KNOWN_HOSTS_FILE, 'w+')
         inthere = False
         save_lines = []
         add_lines = []
         removed = False
         while True:
           rawline = f.readline()
           logger.Debug('read %s' % (repr(rawline),))
           if not rawline:
             # End of file
             break
           line = rawline.split('\n')[0]
           parts = line.split(' ')
           fields = parts[0].split(',')
           key = parts[2]
           haveall = True
           havesome = False
           for spec in [ ip, fullnode ]:
             if spec not in fields:
               haveall = False
             if spec in fields:
               havesome = True
           logger.Debug("key, pubkey = %s." % (repr((key, pubkey)),))
           if haveall and key == pubkey:
             inthere = True
             save_lines.append(rawline)
             logger.Debug("Keeping known_hosts '%s'." % (repr(rawline),))
             continue
           if havesome and (not haveall or key != pubkey):
             removed = True
             logger.Debug("Discarding known_hosts '%s'." % (repr(rawline),))
             continue
           save_lines.append(rawline)
         if not inthere:
           add_lines.append('%s,%s ssh-rsa %s\n' % (fullnode, ip, pubkey))
           logger.Debug("Adding known_hosts '%s'." % (repr(add_lines[-1]),))
         if removed:
           save_lines = save_lines + add_lines
           # Write a new file and replace old.
           fd, tmpname = tempfile.mkstemp('.tmp', 'known_hosts.',
                                          constants.DATA_DIR)
           newfile = os.fdopen(fd, 'w')
           try:
             newfile.write(''.join(save_lines))
           finally:
             newfile.close()
           logger.Debug("Wrote new known_hosts.")
           os.rename(tmpname, constants.SSH_KNOWN_HOSTS_FILE)
         elif add_lines:
           # Simply appending a new line will do the trick.
           f.seek(0, 2)
           for add in add_lines:
             f.write(add)
         f.close()
       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
         """
         if os.path.exists('/root/.ssh/id_dsa'):
           utils.CreateBackup('/root/.ssh/id_dsa')
         if os.path.exists('/root/.ssh/id_dsa.pub'):
           utils.CreateBackup('/root/.ssh/id_dsa.pub')
         utils.RemoveFile('/root/.ssh/id_dsa')
         utils.RemoveFile('/root/.ssh/id_dsa.pub')
         result = utils.RunCmd(["ssh-keygen", "-t", "dsa",
                                "-f", "/root/.ssh/id_dsa",
                                "-q", "-N", ""])
         if result.failed:
           raise errors.OpExecError("Could not generate ssh keypair, error %s" %
                                    result.output)
         f = open('/root/.ssh/id_dsa.pub', 'r')
         try:
           utils.AddAuthorizedKey('/root/.ssh/authorized_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))
       class LUInitCluster(LogicalUnit):
         """Initialise the cluster.
         """
         HPATH = "cluster-init"
         HTYPE = constants.HTYPE_CLUSTER
         _OP_REQP = ["cluster_name", "hypervisor_type", "vg_name", "mac_prefix",
                     "def_bridge", "master_netdev"]
         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 = {
             "CLUSTER": self.op.cluster_name,
             "MASTER": self.hostname['hostname_full'],
+            }
           return env, [], [self.hostname['hostname_full']]
         def CheckPrereq(self):
           """Verify that the passed name is a valid one.
           """
           if config.ConfigWriter.IsCluster():
             raise errors.OpPrereqError("Cluster is already initialised")
           hostname_local = socket.gethostname()
           self.hostname = hostname = utils.LookupHostname(hostname_local)
           if not hostname:
             raise errors.OpPrereqError("Cannot resolve my own hostname ('%s')" %
                                        hostname_local)
           if hostname["hostname_full"] != hostname_local:
             raise errors.OpPrereqError("My own hostname (%s) does not match the"
                                        " resolver (%s): probably not using FQDN"
                                        " for hostname." %
                                        (hostname_local, hostname["hostname_full"]))
           if hostname["ip"].startswith("127."):
             raise errors.OpPrereqError("This host's IP resolves to the private"
                                        " range (%s). Please fix DNS or /etc/hosts." %
                                        (hostname["ip"],))
           self.clustername = clustername = utils.LookupHostname(self.op.cluster_name)
           if not clustername:
             raise errors.OpPrereqError("Cannot resolve given cluster name ('%s')"
                                        % self.op.cluster_name)
           result = utils.RunCmd(["fping", "-S127.0.0.1", "-q", hostname['ip']])
           if result.failed:
             raise errors.OpPrereqError("Inconsistency: this host's name resolves"
                                        " to %s,\nbut this ip address does not"
                                        " belong to this host."
                                        " Aborting." % hostname['ip'])
           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']:
             result = utils.RunCmd(["fping", "-S127.0.0.1", "-q", secondary_ip])
             if result.failed:
               raise errors.OpPrereqError("You gave %s as secondary IP,\n"
                                          "but it does not belong to this host." %
                                          secondary_ip)
           self.secondary_ip = secondary_ip
           # checks presence of the volume group given
           vgstatus = _HasValidVG(utils.ListVolumeGroups(), self.op.vg_name)
           if vgstatus:
             raise errors.OpPrereqError("Error: %s" % vgstatus)
           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 hypervisor.VALID_HTYPES:
             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()))
         def Exec(self, feedback_fn):
           """Initialize the cluster.
           """
           clustername = self.clustername
           hostname = self.hostname
           # set up the simple store
           ss = ssconf.SimpleStore()
           ss.SetKey(ss.SS_HYPERVISOR, self.op.hypervisor_type)
           ss.SetKey(ss.SS_MASTER_NODE, hostname['hostname_full'])
           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['hostname'])
           # set up the inter-node password and certificate
           _InitGanetiServerSetup(ss)
           # start the master ip
           rpc.call_node_start_master(hostname['hostname_full'])
           # set up ssh config and /etc/hosts
           f = open('/etc/ssh/ssh_host_rsa_key.pub', 'r')
           try:
             sshline = f.read()
           finally:
             f.close()
           sshkey = sshline.split(" ")[1]
           _UpdateEtcHosts(hostname['hostname_full'],
                           hostname['ip'],
+                          )
           _UpdateKnownHosts(hostname['hostname_full'],
                             hostname['ip'],
                             sshkey,
+                            )
           _InitSSHSetup(hostname['hostname'])
           # init of cluster config file
           cfgw = config.ConfigWriter()
           cfgw.InitConfig(hostname['hostname'], hostname['ip'], self.secondary_ip,
                           sshkey, self.op.mac_prefix,
                           self.op.vg_name, self.op.def_bridge)
       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.
           """
           utils.CreateBackup('/root/.ssh/id_dsa')
           utils.CreateBackup('/root/.ssh/id_dsa.pub')
           rpc.call_node_leave_cluster(self.sstore.GetMasterNode())
       class LUVerifyCluster(NoHooksLU):
         """Verifies the cluster status.
         """
         _OP_REQP = []
         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 connectivity data")
           else:
             if node_result['nodelist']:
               bad = True
               for node in node_result['nodelist']:
                 feedback_fn("  - ERROR: communication with node '%s': %s" %
                                 (node, node_result['nodelist'][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, 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
           instancelist = self.cfg.GetInstanceList()
           if not instance in instancelist:
             feedback_fn("  - ERROR: instance %s not in instance list %s" %
                             (instance, instancelist))
             bad = True
           instanceconfig = self.cfg.GetInstanceInfo(instance)
           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 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 not 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 CheckPrereq(self):
           """Check prerequisites.
           This has no prerequisites.
           """
           pass
         def Exec(self, feedback_fn):
           """Verify integrity of cluster, performing various test on nodes.
           """
           bad = False
           feedback_fn("* Verifying global settings")
           self.cfg.VerifyConfig()
           master = self.sstore.GetMasterNode()
           vg_name = self.cfg.GetVGName()
           nodelist = utils.NiceSort(self.cfg.GetNodeList())
           instancelist = utils.NiceSort(self.cfg.GetInstanceList())
           node_volume = {}
           node_instance = {}
           # 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,
+            }
           all_nvinfo = rpc.call_node_verify(nodelist, node_verify_param)
           all_rversion = rpc.call_version(nodelist)
           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 type(volumeinfo) != dict:
               feedback_fn("  - ERROR: connection to %s failed" % (node,))
               bad = True
               continue
             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_vol_should = {}
           for instance in instancelist:
             feedback_fn("* Verifying instance %s" % instance)
             result =  self._VerifyInstance(instance, node_volume, node_instance,
                                            feedback_fn)
             bad = bad or result
             inst_config = self.cfg.GetInstanceInfo(instance)
             inst_config.MapLVsByNode(node_vol_should)
           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
           return int(bad)
       def _WaitForSync(cfgw, instance, oneshot=False, unlock=False):
         """Sleep and poll for an instance's disk to sync.
         """
         if not instance.disks:
           return True
         if not oneshot:
           logger.ToStdout("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:
             logger.ToStderr("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:
               logger.ToStderr("Can't compute data for node %s/%s" %
                               (node, instance.disks[i].iv_name))
               continue
             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"
               logger.ToStdout("- 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')
           try:
             time.sleep(min(60, max_time))
           finally:
             if unlock:
               utils.Lock('cmd')
         if done:
           logger.ToStdout("Instance %s's disks are in sync." % instance.name)
         return not cumul_degraded
       def _CheckDiskConsistency(cfgw, dev, node, on_primary):
         """Check that mirrors are not degraded.
         """
         cfgw.SetDiskID(dev, node)
         result = True
         if on_primary or dev.AssembleOnSecondary():
           rstats = rpc.call_blockdev_find(node, dev)
           if not rstats:
             logger.ToStderr("Can't get any data from node %s" % node)
             result = False
           else:
             result = result and (not rstats[5])
         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 = []
         def CheckPrereq(self):
           """Check prerequisites.
           This always succeeds, since this is a pure query LU.
           """
           return
         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")
           return node_data
       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 = {
             "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)
           ssh.SSHCall(node.name, 'root', "%s stop" % constants.NODE_INITD_SCRIPT)
           logger.Info("Removing node %s from config" % node.name)
           self.cfg.RemoveNode(node.name)
       class LUQueryNodes(NoHooksLU):
         """Logical unit for querying nodes.
         """
         _OP_REQP = ["output_fields"]
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the fields required are valid output fields.
           """
           self.dynamic_fields = frozenset(["dtotal", "dfree",
                                            "mtotal", "mnode", "mfree"])
           _CheckOutputFields(static=["name", "pinst", "sinst", "pip", "sip"],
                              dynamic=self.dynamic_fields,
                              selected=self.op.output_fields)
         def Exec(self, feedback_fn):
           """Computes the list of nodes and their attributes.
           """
           nodenames = utils.NiceSort(self.cfg.GetNodeList())
           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']),
+                  }
               else:
                 live_data[name] = {}
           else:
             live_data = dict.fromkeys(nodenames, {})
           node_to_primary = dict.fromkeys(nodenames, 0)
           node_to_secondary = dict.fromkeys(nodenames, 0)
           if "pinst" in self.op.output_fields or "sinst" in self.op.output_fields:
             instancelist = self.cfg.GetInstanceList()
             for instance in instancelist:
               instanceinfo = self.cfg.GetInstanceInfo(instance)
               node_to_primary[instanceinfo.primary_node] += 1
               for secnode in instanceinfo.secondary_nodes:
                 node_to_secondary[secnode] += 1
           # 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":
                 val = node_to_primary[node.name]
               elif field == "sinst":
                 val = 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, "?")
               else:
                 raise errors.ParameterError(field)
               val = str(val)
               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 = utils.NiceSort([node.name for node in 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 = {
             "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.LookupHostname(node_name)
           if not dns_data:
             raise errors.OpPrereqError("Node %s is not resolvable" % node_name)
           node = dns_data['hostname']
           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 node in node_list:
             raise errors.OpPrereqError("Node %s is already in the configuration"
                                        % node)
           for existing_node_name in node_list:
             existing_node = cfg.GetNodeInfo(existing_node_name)
             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
           command = ["fping", "-q", primary_ip]
           result = utils.RunCmd(command)
           if result.failed:
             raise errors.OpPrereqError("Node not reachable by ping")
           if not newbie_singlehomed:
             # check reachability from my secondary ip to newbie's secondary ip
             command = ["fping", "-S%s" % myself.secondary_ip, "-q", secondary_ip]
             result = utils.RunCmd(command)
             if result.failed:
               raise errors.OpPrereqError("Node secondary ip not reachable by ping")
           self.new_node = objects.Node(name=node,
                                        primary_ip=primary_ip,
                                        secondary_ip=secondary_ip)
         def Exec(self, feedback_fn):
           """Adds the new node to the cluster.
           """
           new_node = self.new_node
           node = new_node.name
           # 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 = ssh.SSHCall(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)
           keyarray = []
           keyfiles = ["/etc/ssh/ssh_host_dsa_key", "/etc/ssh/ssh_host_dsa_key.pub",
                       "/etc/ssh/ssh_host_rsa_key", "/etc/ssh/ssh_host_rsa_key.pub",
                       "/root/.ssh/id_dsa", "/root/.ssh/id_dsa.pub"]
           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
           _UpdateEtcHosts(new_node.name, new_node.primary_ip)
           _UpdateKnownHosts(new_node.name, new_node.primary_ip,
                             self.cfg.GetHostKey())
           if new_node.secondary_ip != new_node.primary_ip:
             result = ssh.SSHCall(node, "root",
                                  "fping -S 127.0.0.1 -q %s" % new_node.secondary_ip)
             if result.failed:
               raise errors.OpExecError("Node claims it doesn't have the"
                                        " secondary ip you gave (%s).\n"
                                        "Please fix and re-run this command." %
                                        new_node.secondary_ip)
           success, msg = ssh.VerifyNodeHostname(node)
           if not success:
             raise errors.OpExecError("Node '%s' claims it has a different hostname"
                                      " than the one the resolver gives: %s.\n"
                                      "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() + [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 ("/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()
           for fname in to_copy:
             if not ssh.CopyFileToNode(node, fname):
               logger.Error("could not copy file %s to node %s" % (fname, node))
           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 = {
             "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 = socket.gethostname()
           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.\n"
                                        "%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,\n"
                         "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()),
+            }
           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 = socket.gethostname()
           for node in [node.name for node in self.nodes]:
             if node == myname:
               continue
             if not 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.
           """
           data = []
           for node in self.nodes:
             result = ssh.SSHCall(node.name, "root", self.op.command)
             data.append((node.name, 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
         for inst_disk in instance.disks:
           master_result = None
           for node, node_disk in inst_disk.ComputeNodeTree(instance.primary_node):
             cfg.SetDiskID(node_disk, node)
             is_primary = node == instance.primary_node
             result = rpc.call_blockdev_assemble(node, node_disk, is_primary)
             if not result:
               logger.Error("could not prepare block device %s on node %s (is_pri"
                            "mary=%s)" % (inst_disk.iv_name, node, is_primary))
               if is_primary or not ignore_secondaries:
                 disks_ok = False
             if is_primary:
               master_result = result
           device_info.append((instance.primary_node, inst_disk.iv_name,
                               master_result))
         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
       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
           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))
           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", "")
           node_current = instance.primary_node
           nodeinfo = rpc.call_node_info([node_current], self.cfg.GetVGName())
           if not nodeinfo:
             raise errors.OpExecError("Could not contact node %s for infos" %
                                      (node_current))
           freememory = nodeinfo[node_current]['memory_free']
           memory = instance.memory
           if memory > freememory:
             raise errors.OpExecError("Not enough memory to start instance"
                                      " %s on node %s"
                                      " needed %s MiB, available %s MiB" %
                                      (instance.name, node_current, memory,
                                       freememory))
           _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")
           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
           if not rpc.call_instance_shutdown(node_current, instance):
             logger.Error("could not shutdown instance")
           self.cfg.MarkInstanceDown(instance.name)
           _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)[pnode.name]
             if not isinstance(os_obj, objects.OS):
               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 LURemoveInstance(LogicalUnit):
         """Remove an instance.
         """
         HPATH = "instance-remove"
         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):
           """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):
             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)
           _RemoveDisks(instance, self.cfg)
           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"]
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that the fields required are valid output fields.
           """
           self.dynamic_fields = frozenset(["oper_state", "oper_ram"])
           _CheckOutputFields(static=["name", "os", "pnode", "snodes",
                                      "admin_state", "admin_ram",
                                      "disk_template", "ip", "mac", "bridge",
                                      "sda_size", "sdb_size"],
                              dynamic=self.dynamic_fields,
                              selected=self.op.output_fields)
         def Exec(self, feedback_fn):
           """Computes the list of nodes and their attributes.
           """
           instance_names = utils.NiceSort(self.cfg.GetInstanceList())
           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 = ",".join(instance.secondary_nodes) or "-"
               elif field == "admin_state":
                 if instance.status == "down":
                   val = "no"
                 else:
                   val = "yes"
               elif field == "oper_state":
                 if instance.primary_node in bad_nodes:
                   val = "(node down)"
                 else:
                   if live_data.get(instance.name):
                     val = "running"
                   else:
                     val = "stopped"
               elif field == "admin_ram":
                 val = instance.memory
               elif field == "oper_ram":
                 if instance.primary_node in bad_nodes:
                   val = "(node down)"
                 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 = "N/A"
                 else:
                   val = disk.size
               else:
                 raise errors.ParameterError(field)
               val = str(val)
               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 != constants.DT_REMOTE_RAID1:
             raise errors.OpPrereqError("Instance's disk layout is not"
                                        " remote_raid1.")
           secondary_nodes = instance.secondary_nodes
           if not secondary_nodes:
             raise errors.ProgrammerError("no secondary node but using "
                                          "DT_REMOTE_RAID1 template")
           # check memory requirements on the secondary node
           target_node = secondary_nodes[0]
           nodeinfo = rpc.call_node_info([target_node], self.cfg.GetVGName())
           info = nodeinfo.get(target_node, None)
           if not info:
             raise errors.OpPrereqError("Cannot get current information"
                                        " from node '%s'" % nodeinfo)
           if instance.memory > info['memory_free']:
             raise errors.OpPrereqError("Not enough memory on target node %s."
                                        " %d MB available, %d MB required" %
                                        (target_node, info['memory_free'],
                                         instance.memory))
           # check bridge 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))
           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 remote_raid1, these are md over drbd
             if not _CheckDiskConsistency(self.cfg, dev, target_node, False):
               if not self.op.ignore_consistency:
                 raise errors.OpExecError("Disk %s is degraded on target node,"
                                          " aborting failover." % dev.iv_name)
           feedback_fn("* checking target node resource availability")
           nodeinfo = rpc.call_node_info([target_node], self.cfg.GetVGName())
           if not nodeinfo:
             raise errors.OpExecError("Could not contact target node %s." %
                                      target_node)
           free_memory = int(nodeinfo[target_node]['memory_free'])
           memory = instance.memory
           if memory > free_memory:
             raise errors.OpExecError("Not enough memory to create instance %s on"
                                      " node %s. needed %s MiB, available %s MiB" %
                                      (instance.name, target_node, memory,
                                       free_memory))
           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):
             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))
           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)
           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, 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, child, info):
               return False
         cfg.SetDiskID(device, node)
         new_id = rpc.call_blockdev_create(node, device, device.size, 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, 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, child, force, info):
               return False
         if not force:
           return True
         cfg.SetDiskID(device, node)
         new_id = rpc.call_blockdev_create(node, device, device.size, 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="lvm", size=size,
                                 logical_id=(vgname, names[0]))
         dev_meta = objects.Disk(dev_type="lvm", size=128,
                                 logical_id=(vgname, names[1]))
         drbd_dev = objects.Disk(dev_type="drbd", size=size,
                                 logical_id = (primary, secondary, port),
                                 children = [dev_data, dev_meta])
         return drbd_dev
       def _GenerateDiskTemplate(cfg, template_name,
                                 instance_name, primary_node,
                                 secondary_nodes, disk_sz, swap_sz):
         """Generate the entire disk layout for a given template type.
         """
         #TODO: compute space requirements
         vgname = cfg.GetVGName()
         if template_name == "diskless":
           disks = []
         elif template_name == "plain":
           if len(secondary_nodes) != 0:
             raise errors.ProgrammerError("Wrong template configuration")
           names = _GenerateUniqueNames(cfg, [".sda", ".sdb"])
           sda_dev = objects.Disk(dev_type="lvm", size=disk_sz,
                                  logical_id=(vgname, names[0]),
                                  iv_name = "sda")
           sdb_dev = objects.Disk(dev_type="lvm", size=swap_sz,
                                  logical_id=(vgname, names[1]),
                                  iv_name = "sdb")
           disks = [sda_dev, sdb_dev]
         elif template_name == "local_raid1":
           if len(secondary_nodes) != 0:
             raise errors.ProgrammerError("Wrong template configuration")
           names = _GenerateUniqueNames(cfg, [".sda_m1", ".sda_m2",
                                              ".sdb_m1", ".sdb_m2"])
           sda_dev_m1 = objects.Disk(dev_type="lvm", size=disk_sz,
                                     logical_id=(vgname, names[0]))
           sda_dev_m2 = objects.Disk(dev_type="lvm", size=disk_sz,
                                     logical_id=(vgname, names[1]))
           md_sda_dev = objects.Disk(dev_type="md_raid1", iv_name = "sda",
                                     size=disk_sz,
                                     children = [sda_dev_m1, sda_dev_m2])
           sdb_dev_m1 = objects.Disk(dev_type="lvm", size=swap_sz,
                                     logical_id=(vgname, names[2]))
           sdb_dev_m2 = objects.Disk(dev_type="lvm", size=swap_sz,
                                     logical_id=(vgname, names[3]))
           md_sdb_dev = objects.Disk(dev_type="md_raid1", iv_name = "sdb",
                                     size=swap_sz,
                                     children = [sdb_dev_m1, sdb_dev_m2])
           disks = [md_sda_dev, md_sdb_dev]
         elif template_name == constants.DT_REMOTE_RAID1:
           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 = _GenerateMDDRBDBranch(cfg, primary_node, remote_node,
                                                disk_sz, names[0:2])
           md_sda_dev = objects.Disk(dev_type="md_raid1", iv_name="sda",
                                     children = [drbd_sda_dev], size=disk_sz)
           drbd_sdb_dev = _GenerateMDDRBDBranch(cfg, primary_node, remote_node,
                                                swap_sz, names[2:4])
           md_sdb_dev = objects.Disk(dev_type="md_raid1", iv_name="sdb",
                                     children = [drbd_sdb_dev], size=swap_sz)
           disks = [md_sda_dev, md_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)
         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, 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, 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 remove, 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
         return result
       class LUCreateInstance(LogicalUnit):
         """Create an instance.
         """
         HPATH = "instance-add"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_REQP = ["instance_name", "mem_size", "disk_size", "pnode",
                     "disk_template", "swap_size", "mode", "start", "vcpus",
                     "wait_for_sync"]
         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)],
           ))
           nl = ([self.sstore.GetMasterNode(), self.op.pnode] +
                 self.secondaries)
           return env, nl, nl
         def CheckPrereq(self):
           """Check prerequisites.
           """
           if self.op.mode not in (constants.INSTANCE_CREATE,
                                   constants.INSTANCE_IMPORT):
             raise errors.OpPrereqError("Invalid instance creation mode '%s'" %
                                        self.op.mode)
           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")
           # 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 = []
           # disk template and mirror node verification
           if self.op.disk_template not in constants.DISK_TEMPLATES:
             raise errors.OpPrereqError("Invalid disk template name")
           if self.op.disk_template == constants.DT_REMOTE_RAID1:
             if getattr(self.op, "snode", None) is None:
               raise errors.OpPrereqError("The 'remote_raid1' disk template needs"
                                          " 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)
           # Check lv size requirements
           nodenames = [pnode.name] + self.secondaries
           nodeinfo = rpc.call_node_info(nodenames, self.cfg.GetVGName())
           # Required free disk space as a function of disk and swap space
           req_size_dict = {
             constants.DT_DISKLESS: 0,
             constants.DT_PLAIN: self.op.disk_size + self.op.swap_size,
             constants.DT_LOCAL_RAID1: (self.op.disk_size + self.op.swap_size) * 2,
             # 256 MB are added for drbd metadata, 128MB for each drbd device
             constants.DT_REMOTE_RAID1: self.op.disk_size + self.op.swap_size + 256,
+          }
           if self.op.disk_template not in req_size_dict:
             raise errors.ProgrammerError("Disk template '%s' size requirement"
                                          " is unknown" %  self.op.disk_template)
           req_size = req_size_dict[self.op.disk_template]
           for node in nodenames:
             info = nodeinfo.get(node, None)
             if not info:
               raise errors.OpPrereqError("Cannot get current information"
                                          " from node '%s'" % nodeinfo)
             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)[pnode.name]
           if not isinstance(os_obj, objects.OS):
             raise errors.OpPrereqError("OS '%s' not in supported os list for"
                                        " primary node"  % self.op.os_type)
           # instance verification
           hostname1 = utils.LookupHostname(self.op.instance_name)
           if not hostname1:
             raise errors.OpPrereqError("Instance name '%s' not found in dns" %
                                        self.op.instance_name)
           self.op.instance_name = instance_name = hostname1['hostname']
           instance_list = self.cfg.GetInstanceList()
           if instance_name in instance_list:
             raise errors.OpPrereqError("Instance '%s' is already in the cluster" %
                                        instance_name)
           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 = inst_ip
           command = ["fping", "-q", hostname1['ip']]
           result = utils.RunCmd(command)
           if not result.failed:
             raise errors.OpPrereqError("IP %s of instance %s already in use" %
                                        (hostname1['ip'], instance_name))
           # bridge verification
           bridge = getattr(self.op, "bridge", None)
           if bridge is None:
             self.op.bridge = self.cfg.GetDefBridge()
           else:
             self.op.bridge = bridge
           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))
           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
           nic = objects.NIC(bridge=self.op.bridge, mac=self.cfg.GenerateMAC())
           if self.inst_ip is not None:
             nic.ip = self.inst_ip
           disks = _GenerateDiskTemplate(self.cfg,
                                         self.op.disk_template,
                                         instance, pnode_name,
                                         self.secondaries, self.op.disk_size,
                                         self.op.swap_size)
           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,
+                                  )
           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)
           elif iobj.disk_template == constants.DT_REMOTE_RAID1:
             # 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, 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.name)
           # build ssh cmdline
           argv = ["ssh", "-q", "-t"]
           argv.extend(ssh.KNOWN_HOSTS_OPTS)
           argv.extend(ssh.BATCH_MODE_OPTS)
           argv.append(node)
           argv.append(console_cmd)
           return "ssh", argv
       class LUAddMDDRBDComponent(LogicalUnit):
         """Adda new mirror member to an instance's disk.
         """
         HPATH = "mirror-add"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_REQP = ["instance_name", "remote_node", "disk_name"]
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on the master, the primary and all the secondaries.
           """
           env = {
             "NEW_SECONDARY": self.op.remote_node,
             "DISK_NAME": self.op.disk_name,
+            }
           env.update(_BuildInstanceHookEnvByObject(self.instance))
           nl = [self.sstore.GetMasterNode(), self.instance.primary_node,
                 self.op.remote_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
           remote_node = self.cfg.ExpandNodeName(self.op.remote_node)
           if remote_node is None:
             raise errors.OpPrereqError("Node '%s' not known" % self.op.remote_node)
           self.remote_node = remote_node
           if remote_node == instance.primary_node:
             raise errors.OpPrereqError("The specified node is the primary node of"
                                        " the instance.")
           if instance.disk_template != constants.DT_REMOTE_RAID1:
             raise errors.OpPrereqError("Instance's disk layout is not"
                                        " remote_raid1.")
           for disk in instance.disks:
             if disk.iv_name == self.op.disk_name:
               break
           else:
             raise errors.OpPrereqError("Can't find this device ('%s') in the"
                                        " instance." % self.op.disk_name)
           if len(disk.children) > 1:
             raise errors.OpPrereqError("The device already has two slave"
                                        " devices.\n"
                                        "This would create a 3-disk raid1"
                                        " which we don't allow.")
           self.disk = disk
         def Exec(self, feedback_fn):
           """Add the mirror component
           """
           disk = self.disk
           instance = self.instance
           remote_node = self.remote_node
           lv_names = [".%s_%s" % (disk.iv_name, suf) for suf in ["data", "meta"]]
           names = _GenerateUniqueNames(self.cfg, lv_names)
           new_drbd = _GenerateMDDRBDBranch(self.cfg, instance.primary_node,
                                            remote_node, disk.size, names)
           logger.Info("adding new mirror component on secondary")
           #HARDCODE
           if not _CreateBlockDevOnSecondary(self.cfg, remote_node, new_drbd, False,
                                             _GetInstanceInfoText(instance)):
             raise errors.OpExecError("Failed to create new component on secondary"
                                      " node %s" % remote_node)
           logger.Info("adding new mirror component on primary")
           #HARDCODE
           if not _CreateBlockDevOnPrimary(self.cfg, instance.primary_node, new_drbd,
                                           _GetInstanceInfoText(instance)):
             # remove secondary dev
             self.cfg.SetDiskID(new_drbd, remote_node)
             rpc.call_blockdev_remove(remote_node, new_drbd)
             raise errors.OpExecError("Failed to create volume on primary")
           # the device exists now
           # call the primary node to add the mirror to md
           logger.Info("adding new mirror component to md")
           if not rpc.call_blockdev_addchild(instance.primary_node,
                                                  disk, new_drbd):
             logger.Error("Can't add mirror compoment to md!")
             self.cfg.SetDiskID(new_drbd, remote_node)
             if not rpc.call_blockdev_remove(remote_node, new_drbd):
               logger.Error("Can't rollback on secondary")
             self.cfg.SetDiskID(new_drbd, instance.primary_node)
             if not rpc.call_blockdev_remove(instance.primary_node, new_drbd):
               logger.Error("Can't rollback on primary")
             raise errors.OpExecError("Can't add mirror component to md array")
           disk.children.append(new_drbd)
           self.cfg.AddInstance(instance)
           _WaitForSync(self.cfg, instance)
           return 0
       class LURemoveMDDRBDComponent(LogicalUnit):
         """Remove a component from a remote_raid1 disk.
         """
         HPATH = "mirror-remove"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_REQP = ["instance_name", "disk_name", "disk_id"]
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on the master, the primary and all the secondaries.
           """
           env = {
             "DISK_NAME": self.op.disk_name,
             "DISK_ID": self.op.disk_id,
             "OLD_SECONDARY": self.old_secondary,
+            }
           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)
           self.instance = instance
           if instance.disk_template != constants.DT_REMOTE_RAID1:
             raise errors.OpPrereqError("Instance's disk layout is not"
                                        " remote_raid1.")
           for disk in instance.disks:
             if disk.iv_name == self.op.disk_name:
               break
           else:
             raise errors.OpPrereqError("Can't find this device ('%s') in the"
                                        " instance." % self.op.disk_name)
           for child in disk.children:
             if child.dev_type == "drbd" and child.logical_id[2] == self.op.disk_id:
               break
           else:
             raise errors.OpPrereqError("Can't find the device with this port.")
           if len(disk.children) < 2:
             raise errors.OpPrereqError("Cannot remove the last component from"
                                        " a mirror.")
           self.disk = disk
           self.child = child
           if self.child.logical_id[0] == instance.primary_node:
             oid = 1
           else:
             oid = 0
           self.old_secondary = self.child.logical_id[oid]
         def Exec(self, feedback_fn):
           """Remove the mirror component
           """
           instance = self.instance
           disk = self.disk
           child = self.child
           logger.Info("remove mirror component")
           self.cfg.SetDiskID(disk, instance.primary_node)
           if not rpc.call_blockdev_removechild(instance.primary_node,
                                                     disk, child):
             raise errors.OpExecError("Can't remove child from mirror.")
           for node in child.logical_id[:2]:
             self.cfg.SetDiskID(child, node)
             if not rpc.call_blockdev_remove(node, child):
               logger.Error("Warning: failed to remove device from node %s,"
                            " continuing operation." % node)
           disk.children.remove(child)
           self.cfg.AddInstance(instance)
       class LUReplaceDisks(LogicalUnit):
         """Replace the disks of an instance.
         """
         HPATH = "mirrors-replace"
         HTYPE = constants.HTYPE_INSTANCE
         _OP_REQP = ["instance_name"]
         def BuildHooksEnv(self):
           """Build hooks env.
           This runs on the master, the primary and all the secondaries.
           """
           env = {
             "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] + 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
           if instance.disk_template != constants.DT_REMOTE_RAID1:
             raise errors.OpPrereqError("Instance's disk layout is not"
                                        " remote_raid1.")
           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))
           remote_node = getattr(self.op, "remote_node", None)
           if remote_node is None:
             remote_node = instance.secondary_nodes[0]
           else:
             remote_node = self.cfg.ExpandNodeName(remote_node)
             if remote_node is None:
               raise errors.OpPrereqError("Node '%s' not known" %
                                          self.op.remote_node)
           if remote_node == instance.primary_node:
             raise errors.OpPrereqError("The specified node is the primary node of"
                                        " the instance.")
           self.op.remote_node = remote_node
         def Exec(self, feedback_fn):
           """Replace the disks of an instance.
           """
           instance = self.instance
           iv_names = {}
           # start of work
           remote_node = self.op.remote_node
           cfg = self.cfg
           for dev in instance.disks:
             size = dev.size
             lv_names = [".%s_%s" % (dev.iv_name, suf) for suf in ["data", "meta"]]
             names = _GenerateUniqueNames(cfg, lv_names)
             new_drbd = _GenerateMDDRBDBranch(cfg, instance.primary_node,
                                              remote_node, size, names)
             iv_names[dev.iv_name] = (dev, dev.children[0], new_drbd)
             logger.Info("adding new mirror component on secondary for %s" %
                         dev.iv_name)
             #HARDCODE
             if not _CreateBlockDevOnSecondary(cfg, remote_node, new_drbd, False,
                                               _GetInstanceInfoText(instance)):
               raise errors.OpExecError("Failed to create new component on"
                                        " secondary node %s\n"
                                        "Full abort, cleanup manually!" %
                                        remote_node)
             logger.Info("adding new mirror component on primary")
             #HARDCODE
             if not _CreateBlockDevOnPrimary(cfg, instance.primary_node, new_drbd,
                                             _GetInstanceInfoText(instance)):
               # remove secondary dev
               cfg.SetDiskID(new_drbd, remote_node)
               rpc.call_blockdev_remove(remote_node, new_drbd)
               raise errors.OpExecError("Failed to create volume on primary!\n"
                                        "Full abort, cleanup manually!!")
             # the device exists now
             # call the primary node to add the mirror to md
             logger.Info("adding new mirror component to md")
             if not rpc.call_blockdev_addchild(instance.primary_node, dev,
                                               new_drbd):
               logger.Error("Can't add mirror compoment to md!")
               cfg.SetDiskID(new_drbd, remote_node)
               if not rpc.call_blockdev_remove(remote_node, new_drbd):
                 logger.Error("Can't rollback on secondary")
               cfg.SetDiskID(new_drbd, instance.primary_node)
               if not rpc.call_blockdev_remove(instance.primary_node, new_drbd):
                 logger.Error("Can't rollback on primary")
               raise errors.OpExecError("Full abort, cleanup manually!!")
             dev.children.append(new_drbd)
             cfg.AddInstance(instance)
           # 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
           _WaitForSync(cfg, instance, unlock=True)
           # so check manually all the devices
           for name in iv_names:
             dev, child, new_drbd = iv_names[name]
             cfg.SetDiskID(dev, instance.primary_node)
             is_degr = rpc.call_blockdev_find(instance.primary_node, dev)[5]
             if is_degr:
               raise errors.OpExecError("MD device %s is degraded!" % name)
             cfg.SetDiskID(new_drbd, instance.primary_node)
             is_degr = rpc.call_blockdev_find(instance.primary_node, new_drbd)[5]
             if is_degr:
               raise errors.OpExecError("New drbd device %s is degraded!" % name)
           for name in iv_names:
             dev, child, new_drbd = iv_names[name]
             logger.Info("remove mirror %s component" % name)
             cfg.SetDiskID(dev, instance.primary_node)
             if not rpc.call_blockdev_removechild(instance.primary_node,
                                                       dev, child):
               logger.Error("Can't remove child from mirror, aborting"
                            " *this device cleanup*.\nYou need to cleanup manually!!")
               continue
             for node in child.logical_id[:2]:
               logger.Info("remove child device on %s" % node)
               cfg.SetDiskID(child, node)
               if not rpc.call_blockdev_remove(node, child):
                 logger.Error("Warning: failed to remove device from node %s,"
                              " continuing operation." % node)
             dev.children.remove(child)
             cfg.AddInstance(instance)
       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 == "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,
+              }
             result[instance.name] = idict
           return result
       class LUQueryNodeData(NoHooksLU):
         """Logical unit for querying node data.
         """
         _OP_REQP = ["nodes"]
         def CheckPrereq(self):
           """Check prerequisites.
           This only checks the optional node list against the existing names.
           """
           self.wanted_nodes = _GetWantedNodes(self, self.op.nodes)
         def Exec(self, feedback_fn):
           """Compute and return the list of nodes.
           """
           ilist = [self.cfg.GetInstanceInfo(iname) for iname
                    in self.cfg.GetInstanceList()]
           result = []
           for node in self.wanted_nodes:
             result.append((node.name, node.primary_ip, node.secondary_ip,
                            [inst.name for inst in ilist
                             if inst.primary_node == node.name],
                            [inst.name for inst in ilist
                             if node.name in inst.secondary_nodes],
                            ))
           return result
       class LUSetInstanceParms(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:
             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
             args['nics'] = [(ip, bridge)]
           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.bridge = getattr(self.op, "bridge", None)
           if [self.mem, self.vcpus, self.ip, self.bridge].count(None) == 4:
             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)
           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))
           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([node.name for node in 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 name is a valid one.
           """
           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
         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
           # shutdown the instance, unless requested not to do so
           if self.op.shutdown:
             op = opcodes.OpShutdownInstance(instance_name=instance.name)
             self.processor.ChainOpCode(op, feedback_fn)
           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="lvm", 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:
               op = opcodes.OpStartupInstance(instance_name=instance.name,
                                              force=False)
               self.processor.ChainOpCode(op, feedback_fn)
           # 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.processor.ChainOpCode(op, feedback_fn)
             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 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(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 LUAddTag(TagsLU):
         """Sets a tag on a given object.
         """
         _OP_REQP = ["kind", "name", "tag"]
         def CheckPrereq(self):
           """Check prerequisites.
           This checks the type and length of the tag name and value.
           """
           TagsLU.CheckPrereq(self)
           objects.TaggableObject.ValidateTag(self.op.tag)
         def Exec(self, feedback_fn):
           """Sets the tag.
           """
           try:
             self.target.AddTag(self.op.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 LUDelTag(TagsLU):
         """Delete a tag from a given object.
         """
         _OP_REQP = ["kind", "name", "tag"]
         def CheckPrereq(self):
           """Check prerequisites.
           This checks that we have the given tag.
           """
           TagsLU.CheckPrereq(self)
           objects.TaggableObject.ValidateTag(self.op.tag)
           if self.op.tag not in self.target.GetTags():
             raise errors.OpPrereqError("Tag not found")
         def Exec(self, feedback_fn):
           """Remove the tag from the object.
           """
           self.target.RemoveTag(self.op.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.")

Synnefo » snf-ganeti

root / lib / cmdlib.py @ 2a710df1