Synnefo » snf-ganeti

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#

# Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Google Inc.

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# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

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# This program is distributed in the hope that it will be useful, but

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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# General Public License for more details.

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"""Node related commands"""

# pylint: disable=W0401,W0613,W0614,C0103

# W0401: Wildcard import ganeti.cli

# W0613: Unused argument, since all functions follow the same API

# W0614: Unused import %s from wildcard import (since we need cli)

# C0103: Invalid name gnt-node

import itertools

import errno

from ganeti.cli import *

from ganeti import cli

from ganeti import bootstrap

from ganeti import opcodes

from ganeti import utils

from ganeti import constants

from ganeti import errors

from ganeti import netutils

from ganeti import pathutils

from ganeti import ssh

from ganeti import compat

from ganeti import confd

from ganeti.confd import client as confd_client

#: default list of field for L{ListNodes}

_LIST_DEF_FIELDS = [

  "name", "dtotal", "dfree",

  "mtotal", "mnode", "mfree",

  "pinst_cnt", "sinst_cnt",

  ]

#: Default field list for L{ListVolumes}

_LIST_VOL_DEF_FIELDS = ["node", "phys", "vg", "name", "size", "instance"]

#: default list of field for L{ListStorage}

_LIST_STOR_DEF_FIELDS = [

  constants.SF_NODE,

  constants.SF_TYPE,

  constants.SF_NAME,

  constants.SF_SIZE,

  constants.SF_USED,

  constants.SF_FREE,

  constants.SF_ALLOCATABLE,

  ]

#: default list of power commands

_LIST_POWER_COMMANDS = ["on", "off", "cycle", "status"]

#: headers (and full field list) for L{ListStorage}

_LIST_STOR_HEADERS = {

  constants.SF_NODE: "Node",

  constants.SF_TYPE: "Type",

  constants.SF_NAME: "Name",

  constants.SF_SIZE: "Size",

  constants.SF_USED: "Used",

  constants.SF_FREE: "Free",

  constants.SF_ALLOCATABLE: "Allocatable",

  }

#: User-facing storage unit types

_USER_STORAGE_TYPE = {

  constants.ST_FILE: "file",

  constants.ST_LVM_PV: "lvm-pv",

  constants.ST_LVM_VG: "lvm-vg",

  constants.ST_SHARED_FILE: "sharedfile",

  }

_STORAGE_TYPE_OPT = \

  cli_option("-t", "--storage-type",

             dest="user_storage_type",

             choices=_USER_STORAGE_TYPE.keys(),

             default=None,

             metavar="STORAGE_TYPE",

             help=("Storage type (%s)" %

                   utils.CommaJoin(_USER_STORAGE_TYPE.keys())))

_REPAIRABLE_STORAGE_TYPES = \

  [st for st, so in constants.VALID_STORAGE_OPERATIONS.iteritems()

   if constants.SO_FIX_CONSISTENCY in so]

_MODIFIABLE_STORAGE_TYPES = constants.MODIFIABLE_STORAGE_FIELDS.keys()

_OOB_COMMAND_ASK = compat.UniqueFrozenset([

  constants.OOB_POWER_OFF,

  constants.OOB_POWER_CYCLE,

  ])

_ENV_OVERRIDE = compat.UniqueFrozenset(["list"])

NONODE_SETUP_OPT = cli_option("--no-node-setup", default=True,

                              action="store_false", dest="node_setup",

                              help=("Do not make initial SSH setup on remote"

                                    " node (needs to be done manually)"))

IGNORE_STATUS_OPT = cli_option("--ignore-status", default=False,

                               action="store_true", dest="ignore_status",

                               help=("Ignore the Node(s) offline status"

                                     " (potentially DANGEROUS)"))

def ConvertStorageType(user_storage_type):

  """Converts a user storage type to its internal name.

  """

  try:

    return _USER_STORAGE_TYPE[user_storage_type]

  except KeyError:

    raise errors.OpPrereqError("Unknown storage type: %s" % user_storage_type,

                               errors.ECODE_INVAL)

def _TryReadFile(path):

  """Tries to read a file.

  If the file is not found, C{None} is returned.

  @type path: string

  @param path: Filename

  @rtype: None or string

  @todo: Consider adding a generic ENOENT wrapper

  """

  try:

    return utils.ReadFile(path)

  except EnvironmentError, err:

    if err.errno == errno.ENOENT:

      return None

    else:

      raise

def _ReadSshKeys(keyfiles, _tostderr_fn=ToStderr):

  """Reads SSH keys according to C{keyfiles}.

  @type keyfiles: dict

  @param keyfiles: Dictionary with keys of L{constants.SSHK_ALL} and two-values

    tuples (private and public key file)

  @rtype: list

  @return: List of three-values tuples (L{constants.SSHK_ALL}, private and

    public key as strings)

  """

  result = []

  for (kind, (private_file, public_file)) in keyfiles.items():

    private_key = _TryReadFile(private_file)

    public_key = _TryReadFile(public_file)

    if public_key and private_key:

      result.append((kind, private_key, public_key))

    elif public_key or private_key:

      _tostderr_fn("Couldn't find a complete set of keys for kind '%s'; files"

                   " '%s' and '%s'", kind, private_file, public_file)

  return result

def _SetupSSH(options, cluster_name, node, ssh_port):

  """Configures a destination node's SSH daemon.

  @param options: Command line options

  @type cluster_name

  @param cluster_name: Cluster name

  @type node: string

  @param node: Destination node name

  @type ssh_port: int

  @param ssh_port: Destination node ssh port

  """

  if options.force_join:

    ToStderr("The \"--force-join\" option is no longer supported and will be"

             " ignored.")

  host_keys = _ReadSshKeys(constants.SSH_DAEMON_KEYFILES)

  (_, root_keyfiles) = \

    ssh.GetAllUserFiles(constants.SSH_LOGIN_USER, mkdir=False, dircheck=False)

  root_keys = _ReadSshKeys(root_keyfiles)

  (_, cert_pem) = \

    utils.ExtractX509Certificate(utils.ReadFile(pathutils.NODED_CERT_FILE))

  data = {

    constants.SSHS_CLUSTER_NAME: cluster_name,

    constants.SSHS_NODE_DAEMON_CERTIFICATE: cert_pem,

    constants.SSHS_SSH_HOST_KEY: host_keys,

    constants.SSHS_SSH_ROOT_KEY: root_keys,

    }

  bootstrap.RunNodeSetupCmd(cluster_name, node, pathutils.PREPARE_NODE_JOIN,

                            options.debug, options.verbose, False,

                            options.ssh_key_check, options.ssh_key_check,

                            ssh_port, data)

@UsesRPC

def AddNode(opts, args):

  """Add a node to the cluster.

  @param opts: the command line options selected by the user

  @type args: list

  @param args: should contain only one element, the new node name

  @rtype: int

  @return: the desired exit code

  """

  cl = GetClient()

  node = netutils.GetHostname(name=args[0]).name

  readd = opts.readd

  # Retrieve relevant parameters of the node group.

  ssh_port = None

  try:

    # Passing [] to QueryGroups means query the default group:

    node_groups = [opts.nodegroup] if opts.nodegroup is not None else []

    output = cl.QueryGroups(names=node_groups, fields=["ndp/ssh_port"],

                            use_locking=False)

    (ssh_port, ) = output[0]

  except (errors.OpPrereqError, errors.OpExecError):

    pass

  try:

    output = cl.QueryNodes(names=[node],

                           fields=["name", "sip", "master",

                                   "ndp/ssh_port"],

                           use_locking=False)

    node_exists, sip, is_master, ssh_port = output[0]

  except (errors.OpPrereqError, errors.OpExecError):

    node_exists = ""

    sip = None

  if readd:

    if not node_exists:

      ToStderr("Node %s not in the cluster"

               " - please retry without '--readd'", node)

      return 1

    if is_master:

      ToStderr("Node %s is the master, cannot readd", node)

      return 1

  else:

    if node_exists:

      ToStderr("Node %s already in the cluster (as %s)"

               " - please retry with '--readd'", node, node_exists)

      return 1

    sip = opts.secondary_ip

  # read the cluster name from the master

  (cluster_name, ) = cl.QueryConfigValues(["cluster_name"])

  if not readd and opts.node_setup:

    ToStderr("-- WARNING -- \n"

             "Performing this operation is going to replace the ssh daemon"

             " keypair\n"

             "on the target machine (%s) with the ones of the"

             " current one\n"

             "and grant full intra-cluster ssh root access to/from it\n", node)

  if opts.node_setup:

    _SetupSSH(opts, cluster_name, node, ssh_port)

  bootstrap.SetupNodeDaemon(opts, cluster_name, node, ssh_port)

  if opts.disk_state:

    disk_state = utils.FlatToDict(opts.disk_state)

  else:

    disk_state = {}

  hv_state = dict(opts.hv_state)

  op = opcodes.OpNodeAdd(node_name=args[0], secondary_ip=sip,

                         readd=opts.readd, group=opts.nodegroup,

                         vm_capable=opts.vm_capable, ndparams=opts.ndparams,

                         master_capable=opts.master_capable,

                         disk_state=disk_state,

                         hv_state=hv_state)

  SubmitOpCode(op, opts=opts)

def ListNodes(opts, args):

  """List nodes and their properties.

  @param opts: the command line options selected by the user

  @type args: list

  @param args: nodes to list, or empty for all

  @rtype: int

  @return: the desired exit code

  """

  selected_fields = ParseFields(opts.output, _LIST_DEF_FIELDS)

  fmtoverride = dict.fromkeys(["pinst_list", "sinst_list", "tags"],

                              (",".join, False))

  cl = GetClient()

  return GenericList(constants.QR_NODE, selected_fields, args, opts.units,

                     opts.separator, not opts.no_headers,

                     format_override=fmtoverride, verbose=opts.verbose,

                     force_filter=opts.force_filter, cl=cl)

def ListNodeFields(opts, args):

  """List node fields.

  @param opts: the command line options selected by the user

  @type args: list

  @param args: fields to list, or empty for all

  @rtype: int

  @return: the desired exit code

  """

  cl = GetClient()

  return GenericListFields(constants.QR_NODE, args, opts.separator,

                           not opts.no_headers, cl=cl)

def EvacuateNode(opts, args):

  """Relocate all secondary instance from a node.

  @param opts: the command line options selected by the user

  @type args: list

  @param args: should be an empty list

  @rtype: int

  @return: the desired exit code

  """

  if opts.dst_node is not None:

    ToStderr("New secondary node given (disabling iallocator), hence evacuating"

             " secondary instances only.")

    opts.secondary_only = True

    opts.primary_only = False

  if opts.secondary_only and opts.primary_only:

    raise errors.OpPrereqError("Only one of the --primary-only and"

                               " --secondary-only options can be passed",

                               errors.ECODE_INVAL)

  elif opts.primary_only:

    mode = constants.NODE_EVAC_PRI

  elif opts.secondary_only:

    mode = constants.NODE_EVAC_SEC

  else:

    mode = constants.NODE_EVAC_ALL

  # Determine affected instances

  fields = []

  if not opts.secondary_only:

    fields.append("pinst_list")

  if not opts.primary_only:

    fields.append("sinst_list")

  cl = GetClient()

  qcl = GetClient()

  result = qcl.QueryNodes(names=args, fields=fields, use_locking=False)

  qcl.Close()

  instances = set(itertools.chain(*itertools.chain(*itertools.chain(result))))

  if not instances:

    # No instances to evacuate

    ToStderr("No instances to evacuate on node(s) %s, exiting.",

             utils.CommaJoin(args))

    return constants.EXIT_SUCCESS

  if not (opts.force or

          AskUser("Relocate instance(s) %s from node(s) %s?" %

                  (utils.CommaJoin(utils.NiceSort(instances)),

                   utils.CommaJoin(args)))):

    return constants.EXIT_CONFIRMATION

  # Evacuate node

  op = opcodes.OpNodeEvacuate(node_name=args[0], mode=mode,

                              remote_node=opts.dst_node,

                              iallocator=opts.iallocator,

                              early_release=opts.early_release)

  result = SubmitOrSend(op, opts, cl=cl)

  # Keep track of submitted jobs

  jex = JobExecutor(cl=cl, opts=opts)

  for (status, job_id) in result[constants.JOB_IDS_KEY]:

    jex.AddJobId(None, status, job_id)

  results = jex.GetResults()

  bad_cnt = len([row for row in results if not row[0]])

  if bad_cnt == 0:

    ToStdout("All instances evacuated successfully.")

    rcode = constants.EXIT_SUCCESS

  else:

    ToStdout("There were %s errors during the evacuation.", bad_cnt)

    rcode = constants.EXIT_FAILURE

  return rcode

def FailoverNode(opts, args):

  """Failover all primary instance on a node.

  @param opts: the command line options selected by the user

  @type args: list

  @param args: should be an empty list

  @rtype: int

  @return: the desired exit code

  """

  cl = GetClient()

  force = opts.force

  selected_fields = ["name", "pinst_list"]

  # these fields are static data anyway, so it doesn't matter, but

  # locking=True should be safer

  qcl = GetClient()

  result = qcl.QueryNodes(names=args, fields=selected_fields,

                          use_locking=False)

  qcl.Close()

  node, pinst = result[0]

  if not pinst:

    ToStderr("No primary instances on node %s, exiting.", node)

    return 0

  pinst = utils.NiceSort(pinst)

  retcode = 0

  if not force and not AskUser("Fail over instance(s) %s?" %

                               (",".join("'%s'" % name for name in pinst))):

    return 2

  jex = JobExecutor(cl=cl, opts=opts)

  for iname in pinst:

    op = opcodes.OpInstanceFailover(instance_name=iname,

                                    ignore_consistency=opts.ignore_consistency,

                                    iallocator=opts.iallocator)

    jex.QueueJob(iname, op)

  results = jex.GetResults()

  bad_cnt = len([row for row in results if not row[0]])

  if bad_cnt == 0:

    ToStdout("All %d instance(s) failed over successfully.", len(results))

  else:

    ToStdout("There were errors during the failover:\n"

             "%d error(s) out of %d instance(s).", bad_cnt, len(results))

  return retcode

def MigrateNode(opts, args):

  """Migrate all primary instance on a node.

  """

  cl = GetClient()

  force = opts.force

  selected_fields = ["name", "pinst_list"]

  qcl = GetClient()

  result = qcl.QueryNodes(names=args, fields=selected_fields, use_locking=False)

  qcl.Close()

  ((node, pinst), ) = result

  if not pinst:

    ToStdout("No primary instances on node %s, exiting." % node)

    return 0

  pinst = utils.NiceSort(pinst)

  if not (force or

          AskUser("Migrate instance(s) %s?" %

                  utils.CommaJoin(utils.NiceSort(pinst)))):

    return constants.EXIT_CONFIRMATION

  # this should be removed once --non-live is deprecated

  if not opts.live and opts.migration_mode is not None:

    raise errors.OpPrereqError("Only one of the --non-live and "

                               "--migration-mode options can be passed",

                               errors.ECODE_INVAL)

  if not opts.live: # --non-live passed

    mode = constants.HT_MIGRATION_NONLIVE

  else:

    mode = opts.migration_mode

  op = opcodes.OpNodeMigrate(node_name=args[0], mode=mode,

                             iallocator=opts.iallocator,

                             target_node=opts.dst_node,

                             allow_runtime_changes=opts.allow_runtime_chgs,

                             ignore_ipolicy=opts.ignore_ipolicy)

  result = SubmitOrSend(op, opts, cl=cl)

  # Keep track of submitted jobs

  jex = JobExecutor(cl=cl, opts=opts)

  for (status, job_id) in result[constants.JOB_IDS_KEY]:

    jex.AddJobId(None, status, job_id)

  results = jex.GetResults()

  bad_cnt = len([row for row in results if not row[0]])

  if bad_cnt == 0:

    ToStdout("All instances migrated successfully.")

    rcode = constants.EXIT_SUCCESS

  else:

    ToStdout("There were %s errors during the node migration.", bad_cnt)

    rcode = constants.EXIT_FAILURE

  return rcode

def _FormatNodeInfo(node_info):

  """Format node information for L{cli.PrintGenericInfo()}.

  """

  (name, primary_ip, secondary_ip, pinst, sinst, is_mc, drained, offline,

   master_capable, vm_capable, powered, ndparams, ndparams_custom) = node_info

  info = [

    ("Node name", name),

    ("primary ip", primary_ip),

    ("secondary ip", secondary_ip),

    ("master candidate", is_mc),

    ("drained", drained),

    ("offline", offline),

    ]

  if powered is not None:

    info.append(("powered", powered))

  info.extend([

    ("master_capable", master_capable),

    ("vm_capable", vm_capable),

    ])

  if vm_capable:

    info.extend([

      ("primary for instances",

       [iname for iname in utils.NiceSort(pinst)]),

      ("secondary for instances",

       [iname for iname in utils.NiceSort(sinst)]),

      ])

  info.append(("node parameters",

               FormatParamsDictInfo(ndparams_custom, ndparams)))

  return info

def ShowNodeConfig(opts, args):

  """Show node information.

  @param opts: the command line options selected by the user

  @type args: list

  @param args: should either be an empty list, in which case

      we show information about all nodes, or should contain

      a list of nodes to be queried for information

  @rtype: int

  @return: the desired exit code

  """

  cl = GetClient()

  result = cl.QueryNodes(fields=["name", "pip", "sip",

                                 "pinst_list", "sinst_list",

                                 "master_candidate", "drained", "offline",

                                 "master_capable", "vm_capable", "powered",

                                 "ndparams", "custom_ndparams"],

                         names=args, use_locking=False)

  PrintGenericInfo([

    _FormatNodeInfo(node_info)

    for node_info in result

    ])

  return 0

def RemoveNode(opts, args):

  """Remove a node from the cluster.

  @param opts: the command line options selected by the user

  @type args: list

  @param args: should contain only one element, the name of

      the node to be removed

  @rtype: int

  @return: the desired exit code

  """

  op = opcodes.OpNodeRemove(node_name=args[0])

  SubmitOpCode(op, opts=opts)

  return 0

def PowercycleNode(opts, args):

  """Remove a node from the cluster.

  @param opts: the command line options selected by the user

  @type args: list

  @param args: should contain only one element, the name of

      the node to be removed

  @rtype: int

  @return: the desired exit code

  """

  node = args[0]

  if (not opts.confirm and

      not AskUser("Are you sure you want to hard powercycle node %s?" % node)):

    return 2

  op = opcodes.OpNodePowercycle(node_name=node, force=opts.force)

  result = SubmitOrSend(op, opts)

  if result:

    ToStderr(result)

  return 0

def PowerNode(opts, args):

  """Change/ask power state of a node.

  @param opts: the command line options selected by the user

  @type args: list

  @param args: should contain only one element, the name of

      the node to be removed

  @rtype: int

  @return: the desired exit code

  """

  command = args.pop(0)

  if opts.no_headers:

    headers = None

  else:

    headers = {"node": "Node", "status": "Status"}

  if command not in _LIST_POWER_COMMANDS:

    ToStderr("power subcommand %s not supported." % command)

    return constants.EXIT_FAILURE

  oob_command = "power-%s" % command

  if oob_command in _OOB_COMMAND_ASK:

    if not args:

      ToStderr("Please provide at least one node for this command")

      return constants.EXIT_FAILURE

    elif not opts.force and not ConfirmOperation(args, "nodes",

                                                 "power %s" % command):

      return constants.EXIT_FAILURE

    assert len(args) > 0

  opcodelist = []

  if not opts.ignore_status and oob_command == constants.OOB_POWER_OFF:

    # TODO: This is a little ugly as we can't catch and revert

    for node in args:

      opcodelist.append(opcodes.OpNodeSetParams(node_name=node, offline=True,

                                                auto_promote=opts.auto_promote))

  opcodelist.append(opcodes.OpOobCommand(node_names=args,

                                         command=oob_command,

                                         ignore_status=opts.ignore_status,

                                         timeout=opts.oob_timeout,

                                         power_delay=opts.power_delay))

  cli.SetGenericOpcodeOpts(opcodelist, opts)

  job_id = cli.SendJob(opcodelist)

  # We just want the OOB Opcode status

  # If it fails PollJob gives us the error message in it

  result = cli.PollJob(job_id)[-1]

  errs = 0

  data = []

  for node_result in result:

    (node_tuple, data_tuple) = node_result

    (_, node_name) = node_tuple

    (data_status, data_node) = data_tuple

    if data_status == constants.RS_NORMAL:

      if oob_command == constants.OOB_POWER_STATUS:

        if data_node[constants.OOB_POWER_STATUS_POWERED]:

          text = "powered"

        else:

          text = "unpowered"

        data.append([node_name, text])

      else:

        # We don't expect data here, so we just say, it was successfully invoked

        data.append([node_name, "invoked"])

    else:

      errs += 1

      data.append([node_name, cli.FormatResultError(data_status, True)])

  data = GenerateTable(separator=opts.separator, headers=headers,

                       fields=["node", "status"], data=data)

  for line in data:

    ToStdout(line)

  if errs:

    return constants.EXIT_FAILURE

  else:

    return constants.EXIT_SUCCESS

def Health(opts, args):

  """Show health of a node using OOB.

  @param opts: the command line options selected by the user

  @type args: list

  @param args: should contain only one element, the name of

      the node to be removed

  @rtype: int

  @return: the desired exit code

  """

  op = opcodes.OpOobCommand(node_names=args, command=constants.OOB_HEALTH,

                            timeout=opts.oob_timeout)

  result = SubmitOpCode(op, opts=opts)

  if opts.no_headers:

    headers = None

  else:

    headers = {"node": "Node", "status": "Status"}

  errs = 0

  data = []

  for node_result in result:

    (node_tuple, data_tuple) = node_result

    (_, node_name) = node_tuple

    (data_status, data_node) = data_tuple

    if data_status == constants.RS_NORMAL:

      data.append([node_name, "%s=%s" % tuple(data_node[0])])

      for item, status in data_node[1:]:

        data.append(["", "%s=%s" % (item, status)])

    else:

      errs += 1

      data.append([node_name, cli.FormatResultError(data_status, True)])

  data = GenerateTable(separator=opts.separator, headers=headers,

                       fields=["node", "status"], data=data)

  for line in data:

    ToStdout(line)

  if errs:

    return constants.EXIT_FAILURE

  else:

    return constants.EXIT_SUCCESS

def ListVolumes(opts, args):

  """List logical volumes on node(s).

  @param opts: the command line options selected by the user

  @type args: list

  @param args: should either be an empty list, in which case

      we list data for all nodes, or contain a list of nodes

      to display data only for those

  @rtype: int

  @return: the desired exit code

  """

  selected_fields = ParseFields(opts.output, _LIST_VOL_DEF_FIELDS)

  op = opcodes.OpNodeQueryvols(nodes=args, output_fields=selected_fields)

  output = SubmitOpCode(op, opts=opts)

  if not opts.no_headers:

    headers = {"node": "Node", "phys": "PhysDev",

               "vg": "VG", "name": "Name",

               "size": "Size", "instance": "Instance"}

  else:

    headers = None

  unitfields = ["size"]

  numfields = ["size"]

  data = GenerateTable(separator=opts.separator, headers=headers,

                       fields=selected_fields, unitfields=unitfields,

                       numfields=numfields, data=output, units=opts.units)

  for line in data:

    ToStdout(line)

  return 0

def ListStorage(opts, args):

  """List physical volumes on node(s).

  @param opts: the command line options selected by the user

  @type args: list

  @param args: should either be an empty list, in which case

      we list data for all nodes, or contain a list of nodes

      to display data only for those

  @rtype: int

  @return: the desired exit code

  """

  selected_fields = ParseFields(opts.output, _LIST_STOR_DEF_FIELDS)

  op = opcodes.OpNodeQueryStorage(nodes=args,

                                  storage_type=opts.user_storage_type,

                                  output_fields=selected_fields)

  output = SubmitOpCode(op, opts=opts)

  if not opts.no_headers:

    headers = {

      constants.SF_NODE: "Node",

      constants.SF_TYPE: "Type",

      constants.SF_NAME: "Name",

      constants.SF_SIZE: "Size",

      constants.SF_USED: "Used",

      constants.SF_FREE: "Free",

      constants.SF_ALLOCATABLE: "Allocatable",

      }

  else:

    headers = None

  unitfields = [constants.SF_SIZE, constants.SF_USED, constants.SF_FREE]

  numfields = [constants.SF_SIZE, constants.SF_USED, constants.SF_FREE]

  # change raw values to nicer strings

  for row in output:

    for idx, field in enumerate(selected_fields):

      val = row[idx]

      if field == constants.SF_ALLOCATABLE:

        if val:

          val = "Y"

        else:

          val = "N"

      row[idx] = str(val)

  data = GenerateTable(separator=opts.separator, headers=headers,

                       fields=selected_fields, unitfields=unitfields,

                       numfields=numfields, data=output, units=opts.units)

  for line in data:

    ToStdout(line)

  return 0

def ModifyStorage(opts, args):

  """Modify storage volume on a node.

  @param opts: the command line options selected by the user

  @type args: list

  @param args: should contain 3 items: node name, storage type and volume name

  @rtype: int

  @return: the desired exit code

  """

  (node_name, user_storage_type, volume_name) = args

  storage_type = ConvertStorageType(user_storage_type)

  changes = {}

  if opts.allocatable is not None:

    changes[constants.SF_ALLOCATABLE] = opts.allocatable

  if changes:

    op = opcodes.OpNodeModifyStorage(node_name=node_name,

                                     storage_type=storage_type,

                                     name=volume_name,

                                     changes=changes)

    SubmitOrSend(op, opts)

  else:

    ToStderr("No changes to perform, exiting.")

def RepairStorage(opts, args):

  """Repairs a storage volume on a node.

  @param opts: the command line options selected by the user

  @type args: list

  @param args: should contain 3 items: node name, storage type and volume name

  @rtype: int

  @return: the desired exit code

  """

  (node_name, user_storage_type, volume_name) = args

  storage_type = ConvertStorageType(user_storage_type)

  op = opcodes.OpRepairNodeStorage(node_name=node_name,

                                   storage_type=storage_type,

                                   name=volume_name,

                                   ignore_consistency=opts.ignore_consistency)

  SubmitOrSend(op, opts)

def SetNodeParams(opts, args):

  """Modifies a node.

  @param opts: the command line options selected by the user

  @type args: list

  @param args: should contain only one element, the node name

  @rtype: int

  @return: the desired exit code

  """

  all_changes = [opts.master_candidate, opts.drained, opts.offline,

                 opts.master_capable, opts.vm_capable, opts.secondary_ip,

                 opts.ndparams]

  if (all_changes.count(None) == len(all_changes) and

      not (opts.hv_state or opts.disk_state)):

    ToStderr("Please give at least one of the parameters.")

    return 1

  if opts.disk_state:

    disk_state = utils.FlatToDict(opts.disk_state)

  else:

    disk_state = {}

  hv_state = dict(opts.hv_state)

  op = opcodes.OpNodeSetParams(node_name=args[0],

                               master_candidate=opts.master_candidate,

                               offline=opts.offline,

                               drained=opts.drained,

                               master_capable=opts.master_capable,

                               vm_capable=opts.vm_capable,

                               secondary_ip=opts.secondary_ip,

                               force=opts.force,

                               ndparams=opts.ndparams,

                               auto_promote=opts.auto_promote,

                               powered=opts.node_powered,

                               hv_state=hv_state,

                               disk_state=disk_state)

  # even if here we process the result, we allow submit only

  result = SubmitOrSend(op, opts)

  if result:

    ToStdout("Modified node %s", args[0])

    for param, data in result:

      ToStdout(" - %-5s -> %s", param, data)

  return 0

def RestrictedCommand(opts, args):

  """Runs a remote command on node(s).

  @param opts: Command line options selected by user

  @type args: list

  @param args: Command line arguments

  @rtype: int

  @return: Exit code

  """

  cl = GetClient()

  if len(args) > 1 or opts.nodegroup:

    # Expand node names

    nodes = GetOnlineNodes(nodes=args[1:], cl=cl, nodegroup=opts.nodegroup)

  else:

    raise errors.OpPrereqError("Node group or node names must be given",

                               errors.ECODE_INVAL)

  op = opcodes.OpRestrictedCommand(command=args[0], nodes=nodes,

                                   use_locking=opts.do_locking)

  result = SubmitOrSend(op, opts, cl=cl)

  exit_code = constants.EXIT_SUCCESS

  for (node, (status, text)) in zip(nodes, result):

    ToStdout("------------------------------------------------")

    if status:

      if opts.show_machine_names:

        for line in text.splitlines():

          ToStdout("%s: %s", node, line)

      else:

        ToStdout("Node: %s", node)

        ToStdout(text)

    else:

      exit_code = constants.EXIT_FAILURE

      ToStdout(text)

  return exit_code

class ReplyStatus(object):

  """Class holding a reply status for synchronous confd clients.

  """

  def __init__(self):

    self.failure = True

    self.answer = False

def ListDrbd(opts, args):

  """Modifies a node.

  @param opts: the command line options selected by the user

  @type args: list

  @param args: should contain only one element, the node name

  @rtype: int

  @return: the desired exit code

  """

  if len(args) != 1:

    ToStderr("Please give one (and only one) node.")

    return constants.EXIT_FAILURE

  if not constants.ENABLE_CONFD:

    ToStderr("Error: this command requires confd support, but it has not"

             " been enabled at build time.")

    return constants.EXIT_FAILURE

  status = ReplyStatus()

  def ListDrbdConfdCallback(reply):

    """Callback for confd queries"""

    if reply.type == confd_client.UPCALL_REPLY:

      answer = reply.server_reply.answer

      reqtype = reply.orig_request.type

      if reqtype == constants.CONFD_REQ_NODE_DRBD:

        if reply.server_reply.status != constants.CONFD_REPL_STATUS_OK:

          ToStderr("Query gave non-ok status '%s': %s" %

                   (reply.server_reply.status,

                    reply.server_reply.answer))

          status.failure = True

          return

        if not confd.HTNodeDrbd(answer):

          ToStderr("Invalid response from server: expected %s, got %s",

                   confd.HTNodeDrbd, answer)

          status.failure = True

        else:

          status.failure = False

          status.answer = answer

      else:

        ToStderr("Unexpected reply %s!?", reqtype)

        status.failure = True

  node = args[0]

  hmac = utils.ReadFile(pathutils.CONFD_HMAC_KEY)

  filter_callback = confd_client.ConfdFilterCallback(ListDrbdConfdCallback)

  counting_callback = confd_client.ConfdCountingCallback(filter_callback)

  cf_client = confd_client.ConfdClient(hmac, [constants.IP4_ADDRESS_LOCALHOST],

                                       counting_callback)

  req = confd_client.ConfdClientRequest(type=constants.CONFD_REQ_NODE_DRBD,

                                        query=node)

  def DoConfdRequestReply(req):

    counting_callback.RegisterQuery(req.rsalt)

    cf_client.SendRequest(req, async=False)

    while not counting_callback.AllAnswered():

      if not cf_client.ReceiveReply():

        ToStderr("Did not receive all expected confd replies")

        break

  DoConfdRequestReply(req)

  if status.failure:

    return constants.EXIT_FAILURE

  fields = ["node", "minor", "instance", "disk", "role", "peer"]

  if opts.no_headers:

    headers = None

  else:

    headers = {"node": "Node", "minor": "Minor", "instance": "Instance",

               "disk": "Disk", "role": "Role", "peer": "PeerNode"}

  data = GenerateTable(separator=opts.separator, headers=headers,

                       fields=fields, data=sorted(status.answer),

                       numfields=["minor"])

  for line in data:

    ToStdout(line)

  return constants.EXIT_SUCCESS

commands = {

  "add": (

    AddNode, [ArgHost(min=1, max=1)],

    [SECONDARY_IP_OPT, READD_OPT, NOSSH_KEYCHECK_OPT, NODE_FORCE_JOIN_OPT,

     NONODE_SETUP_OPT, VERBOSE_OPT, NODEGROUP_OPT, PRIORITY_OPT,

     CAPAB_MASTER_OPT, CAPAB_VM_OPT, NODE_PARAMS_OPT, HV_STATE_OPT,

     DISK_STATE_OPT],

    "[-s ip] [--readd] [--no-ssh-key-check] [--force-join]"

    " [--no-node-setup] [--verbose] [--network] <node_name>",

    "Add a node to the cluster"),

  "evacuate": (

    EvacuateNode, ARGS_ONE_NODE,

    [FORCE_OPT, IALLOCATOR_OPT, NEW_SECONDARY_OPT, EARLY_RELEASE_OPT,

     PRIORITY_OPT, PRIMARY_ONLY_OPT, SECONDARY_ONLY_OPT] + SUBMIT_OPTS,

    "[-f] {-I <iallocator> | -n <dst>} [-p | -s] [options...] <node>",

    "Relocate the primary and/or secondary instances from a node"),