Synnefo » snf-ganeti

#!/usr/bin/python

#

# Copyright (C) 2006, 2007, 2008, 2009, 2010 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.

"""Node related commands"""

# pylint: disable-msg=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 sys

from ganeti.cli import *

from ganeti import bootstrap

from ganeti import opcodes

from ganeti import utils

from ganeti import constants

from ganeti import compat

from ganeti import errors

from ganeti import netutils

#: 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,

  ]

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

_LIST_HEADERS = {

  "name": "Node", "pinst_cnt": "Pinst", "sinst_cnt": "Sinst",

  "pinst_list": "PriInstances", "sinst_list": "SecInstances",

  "pip": "PrimaryIP", "sip": "SecondaryIP",

  "dtotal": "DTotal", "dfree": "DFree",

  "mtotal": "MTotal", "mnode": "MNode", "mfree": "MFree",

  "bootid": "BootID",

  "ctotal": "CTotal", "cnodes": "CNodes", "csockets": "CSockets",

  "tags": "Tags",

  "serial_no": "SerialNo",

  "master_candidate": "MasterC",

  "master": "IsMaster",

  "offline": "Offline", "drained": "Drained",

  "role": "Role",

  "ctime": "CTime", "mtime": "MTime", "uuid": "UUID",

  "master_capable": "MasterCapable", "vm_capable": "VMCapable",

  }

#: 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",

  }

_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()

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)"))

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 _RunSetupSSH(options, nodes):

  """Wrapper around utils.RunCmd to call setup-ssh

  @param options: The command line options

  @param nodes: The nodes to setup

  """

  cmd = [constants.SETUP_SSH]

  # Pass --debug|--verbose to the external script if set on our invocation

  # --debug overrides --verbose

  if options.debug:

    cmd.append("--debug")

  elif options.verbose:

    cmd.append("--verbose")

  if not options.ssh_key_check:

    cmd.append("--no-ssh-key-check")

  cmd.extend(nodes)

  result = utils.RunCmd(cmd, interactive=True)

  if result.failed:

    errmsg = ("Command '%s' failed with exit code %s; output %r" %

              (result.cmd, result.exit_code, result.output))

    raise errors.OpExecError(errmsg)

@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

  try:

    output = cl.QueryNodes(names=[node], fields=['name', 'sip'],

                           use_locking=False)

    node_exists, sip = 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

  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

  output = cl.QueryConfigValues(['cluster_name'])

  cluster_name = output[0]

  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:

    _RunSetupSSH(opts, [node])

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

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

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

  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: should be an empty list

  @rtype: int

  @return: the desired exit code

  """

  selected_fields = ParseFields(opts.output, _LIST_DEF_FIELDS)

  output = GetClient().QueryNodes(args, selected_fields, opts.do_locking)

  if not opts.no_headers:

    headers = _LIST_HEADERS

  else:

    headers = None

  unitfields = ["dtotal", "dfree", "mtotal", "mnode", "mfree"]

  numfields = ["dtotal", "dfree",

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

               "pinst_cnt", "sinst_cnt",

               "ctotal", "serial_no"]

  list_type_fields = ("pinst_list", "sinst_list", "tags")

  # change raw values to nicer strings

  for row in output:

    for idx, field in enumerate(selected_fields):

      val = row[idx]

      if field in list_type_fields:

        val = ",".join(val)

      elif field in ('master', 'master_candidate', 'offline', 'drained',

                     'master_capable', 'vm_capable'):

        if val:

          val = 'Y'

        else:

          val = 'N'

      elif field == "ctime" or field == "mtime":

        val = utils.FormatTime(val)

      elif val is None:

        val = "?"

      elif opts.roman_integers and isinstance(val, int):

        val = compat.TryToRoman(val)

      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 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

  """

  cl = GetClient()

  force = opts.force

  dst_node = opts.dst_node

  iallocator = opts.iallocator

  op = opcodes.OpNodeEvacuationStrategy(nodes=args,

                                        iallocator=iallocator,

                                        remote_node=dst_node)

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

  if not result:

    # no instances to migrate

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

             utils.CommaJoin(args))

    return constants.EXIT_SUCCESS

  if not force and not AskUser("Relocate instance(s) %s from node(s) %s?" %

                               (",".join("'%s'" % name[0] for name in result),

                               utils.CommaJoin(args))):

    return constants.EXIT_CONFIRMATION

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

  for row in result:

    iname = row[0]

    node = row[1]

    ToStdout("Will relocate instance %s to node %s", iname, node)

    op = opcodes.OpReplaceDisks(instance_name=iname,

                                remote_node=node, disks=[],

                                mode=constants.REPLACE_DISK_CHG,

                                early_release=opts.early_release)

    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))

    rcode = constants.EXIT_SUCCESS

  else:

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

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

    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

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

                         use_locking=False)

  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.OpFailoverInstance(instance_name=iname,

                                    ignore_consistency=opts.ignore_consistency)

    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"]

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

  node, pinst = result[0]

  if not pinst:

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

    return 0

  pinst = utils.NiceSort(pinst)

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

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

    return 2

  # 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.OpMigrateNode(node_name=args[0], mode=mode)

  SubmitOpCode(op, cl=cl, opts=opts)

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"],

                         names=args, use_locking=False)

  for (name, primary_ip, secondary_ip, pinst, sinst,

       is_mc, drained, offline) in result:

    ToStdout("Node name: %s", name)

    ToStdout("  primary ip: %s", primary_ip)

    ToStdout("  secondary ip: %s", secondary_ip)

    ToStdout("  master candidate: %s", is_mc)

    ToStdout("  drained: %s", drained)

    ToStdout("  offline: %s", offline)

    if pinst:

      ToStdout("  primary for instances:")

      for iname in utils.NiceSort(pinst):

        ToStdout("    - %s", iname)

    else:

      ToStdout("  primary for no instances")

    if sinst:

      ToStdout("  secondary for instances:")

      for iname in utils.NiceSort(sinst):

        ToStdout("    - %s", iname)

    else:

      ToStdout("  secondary for no instances")

  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.OpRemoveNode(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.OpPowercycleNode(node_name=node, force=opts.force)

  result = SubmitOpCode(op, opts=opts)

  if result:

    ToStderr(result)

  return 0

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.OpQueryNodeVolumes(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

  """

  # TODO: Default to ST_FILE if LVM is disabled on the cluster

  if opts.user_storage_type is None:

    opts.user_storage_type = constants.ST_LVM_PV

  storage_type = ConvertStorageType(opts.user_storage_type)

  selected_fields = ParseFields(opts.output, _LIST_STOR_DEF_FIELDS)

  op = opcodes.OpQueryNodeStorage(nodes=args,

                                  storage_type=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.OpModifyNodeStorage(node_name=node_name,

                                     storage_type=storage_type,

                                     name=volume_name,

                                     changes=changes)

    SubmitOpCode(op, opts=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)

  SubmitOpCode(op, opts=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

  """

  if [opts.master_candidate, opts.drained, opts.offline].count(None) == 3:

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

    return 1

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

                               master_candidate=opts.master_candidate,

                               offline=opts.offline,

                               drained=opts.drained,

                               master_capable=opts.master_capable,

                               force=opts.force,

                               auto_promote=opts.auto_promote)

  # 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

commands = {

  'add': (

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

    [SECONDARY_IP_OPT, READD_OPT, NOSSH_KEYCHECK_OPT, NONODE_SETUP_OPT,

     VERBOSE_OPT, NODEGROUP_OPT, PRIORITY_OPT],

    "[-s ip] [--readd] [--no-ssh-key-check] [--no-node-setup]  [--verbose] "

    " <node_name>",

    "Add a node to the cluster"),

  'evacuate': (

    EvacuateNode, [ArgNode(min=1)],

    [FORCE_OPT, IALLOCATOR_OPT, NEW_SECONDARY_OPT, EARLY_RELEASE_OPT,

     PRIORITY_OPT],

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

    "Relocate the secondary instances from a node"

    " to other nodes (only for instances with drbd disk template)"),

  'failover': (

    FailoverNode, ARGS_ONE_NODE, [FORCE_OPT, IGNORE_CONSIST_OPT, PRIORITY_OPT],

    "[-f] <node>",

    "Stops the primary instances on a node and start them on their"

    " secondary node (only for instances with drbd disk template)"),

  'migrate': (

    MigrateNode, ARGS_ONE_NODE,

    [FORCE_OPT, NONLIVE_OPT, MIGRATION_MODE_OPT, PRIORITY_OPT],

    "[-f] <node>",

    "Migrate all the primary instance on a node away from it"

    " (only for instances of type drbd)"),

  'info': (

    ShowNodeConfig, ARGS_MANY_NODES, [],

    "[<node_name>...]", "Show information about the node(s)"),

  'list': (

    ListNodes, ARGS_MANY_NODES,

    [NOHDR_OPT, SEP_OPT, USEUNITS_OPT, FIELDS_OPT, SYNC_OPT, ROMAN_OPT],

    "[nodes...]",

    "Lists the nodes in the cluster. The available fields are (see the man"

    " page for details): %s. The default field list is (in order): %s." %

    (utils.CommaJoin(_LIST_HEADERS), utils.CommaJoin(_LIST_DEF_FIELDS))),

  'modify': (

    SetNodeParams, ARGS_ONE_NODE,

    [FORCE_OPT, SUBMIT_OPT, MC_OPT, DRAINED_OPT, OFFLINE_OPT, CAPAB_MASTER_OPT,

     AUTO_PROMOTE_OPT, DRY_RUN_OPT, PRIORITY_OPT],

    "<node_name>", "Alters the parameters of a node"),

  'powercycle': (

    PowercycleNode, ARGS_ONE_NODE,

    [FORCE_OPT, CONFIRM_OPT, DRY_RUN_OPT, PRIORITY_OPT],

    "<node_name>", "Tries to forcefully powercycle a node"),

  'remove': (

    RemoveNode, ARGS_ONE_NODE, [DRY_RUN_OPT, PRIORITY_OPT],

    "<node_name>", "Removes a node from the cluster"),

  'volumes': (

    ListVolumes, [ArgNode()],

    [NOHDR_OPT, SEP_OPT, USEUNITS_OPT, FIELDS_OPT, PRIORITY_OPT],

    "[<node_name>...]", "List logical volumes on node(s)"),

  'list-storage': (

    ListStorage, ARGS_MANY_NODES,

    [NOHDR_OPT, SEP_OPT, USEUNITS_OPT, FIELDS_OPT, _STORAGE_TYPE_OPT,

     PRIORITY_OPT],

    "[<node_name>...]", "List physical volumes on node(s). The available"

    " fields are (see the man page for details): %s." %

    (utils.CommaJoin(_LIST_STOR_HEADERS))),

  'modify-storage': (

    ModifyStorage,

    [ArgNode(min=1, max=1),

     ArgChoice(min=1, max=1, choices=_MODIFIABLE_STORAGE_TYPES),

     ArgFile(min=1, max=1)],

    [ALLOCATABLE_OPT, DRY_RUN_OPT, PRIORITY_OPT],

    "<node_name> <storage_type> <name>", "Modify storage volume on a node"),

  'repair-storage': (

    RepairStorage,

    [ArgNode(min=1, max=1),

     ArgChoice(min=1, max=1, choices=_REPAIRABLE_STORAGE_TYPES),

     ArgFile(min=1, max=1)],

    [IGNORE_CONSIST_OPT, DRY_RUN_OPT, PRIORITY_OPT],

    "<node_name> <storage_type> <name>",

    "Repairs a storage volume on a node"),

  'list-tags': (

    ListTags, ARGS_ONE_NODE, [],

    "<node_name>", "List the tags of the given node"),

  'add-tags': (

    AddTags, [ArgNode(min=1, max=1), ArgUnknown()], [TAG_SRC_OPT, PRIORITY_OPT],

    "<node_name> tag...", "Add tags to the given node"),

  'remove-tags': (

    RemoveTags, [ArgNode(min=1, max=1), ArgUnknown()],

    [TAG_SRC_OPT, PRIORITY_OPT],

    "<node_name> tag...", "Remove tags from the given node"),

  }

if __name__ == '__main__':

  sys.exit(GenericMain(commands, override={"tag_type": constants.TAG_NODE}))