Synnefo » snf-ganeti » ganeti-local

#!/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.

# pylint: disable-msg=W0401,W0614

# W0401: Wildcard import ganeti.cli

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

import sys

import os

import itertools

import simplejson

from optparse import make_option

from cStringIO import StringIO

from ganeti.cli import *

from ganeti import cli

from ganeti import opcodes

from ganeti import constants

from ganeti import utils

from ganeti import errors

_SHUTDOWN_CLUSTER = "cluster"

_SHUTDOWN_NODES_BOTH = "nodes"

_SHUTDOWN_NODES_PRI = "nodes-pri"

_SHUTDOWN_NODES_SEC = "nodes-sec"

_SHUTDOWN_INSTANCES = "instances"

_VALUE_TRUE = "true"

#: default list of options for L{ListInstances}

_LIST_DEF_FIELDS = [

  "name", "hypervisor", "os", "pnode", "status", "oper_ram",

  ]

def _ExpandMultiNames(mode, names, client=None):

  """Expand the given names using the passed mode.

  For _SHUTDOWN_CLUSTER, all instances will be returned. For

  _SHUTDOWN_NODES_PRI/SEC, all instances having those nodes as

  primary/secondary will be returned. For _SHUTDOWN_NODES_BOTH, all

  instances having those nodes as either primary or secondary will be

  returned. For _SHUTDOWN_INSTANCES, the given instances will be

  returned.

  @param mode: one of L{_SHUTDOWN_CLUSTER}, L{_SHUTDOWN_NODES_BOTH},

      L{_SHUTDOWN_NODES_PRI}, L{_SHUTDOWN_NODES_SEC} or

      L{_SHUTDOWN_INSTANCES}

  @param names: a list of names; for cluster, it must be empty,

      and for node and instance it must be a list of valid item

      names (short names are valid as usual, e.g. node1 instead of

      node1.example.com)

  @rtype: list

  @return: the list of names after the expansion

  @raise errors.ProgrammerError: for unknown selection type

  @raise errors.OpPrereqError: for invalid input parameters

  """

  if client is None:

    client = GetClient()

  if mode == _SHUTDOWN_CLUSTER:

    if names:

      raise errors.OpPrereqError("Cluster filter mode takes no arguments")

    idata = client.QueryInstances([], ["name"], False)

    inames = [row[0] for row in idata]

  elif mode in (_SHUTDOWN_NODES_BOTH,

                _SHUTDOWN_NODES_PRI,

                _SHUTDOWN_NODES_SEC):

    if not names:

      raise errors.OpPrereqError("No node names passed")

    ndata = client.QueryNodes(names, ["name", "pinst_list", "sinst_list"],

                              True)

    ipri = [row[1] for row in ndata]

    pri_names = list(itertools.chain(*ipri))

    isec = [row[2] for row in ndata]

    sec_names = list(itertools.chain(*isec))

    if mode == _SHUTDOWN_NODES_BOTH:

      inames = pri_names + sec_names

    elif mode == _SHUTDOWN_NODES_PRI:

      inames = pri_names

    elif mode == _SHUTDOWN_NODES_SEC:

      inames = sec_names

    else:

      raise errors.ProgrammerError("Unhandled shutdown type")

  elif mode == _SHUTDOWN_INSTANCES:

    if not names:

      raise errors.OpPrereqError("No instance names passed")

    idata = client.QueryInstances(names, ["name"], False)

    inames = [row[0] for row in idata]

  else:

    raise errors.OpPrereqError("Unknown mode '%s'" % mode)

  return inames

def _ConfirmOperation(inames, text):

  """Ask the user to confirm an operation on a list of instances.

  This function is used to request confirmation for doing an operation

  on a given list of instances.

  @type inames: list

  @param inames: the list of names that we display when

      we ask for confirmation

  @type text: str

  @param text: the operation that the user should confirm

      (e.g. I{shutdown} or I{startup})

  @rtype: boolean

  @return: True or False depending on user's confirmation.

  """

  count = len(inames)

  msg = ("The %s will operate on %d instances.\n"

         "Do you want to continue?" % (text, count))

  affected = ("\nAffected instances:\n" +

              "\n".join(["  %s" % name for name in inames]))

  choices = [('y', True, 'Yes, execute the %s' % text),

             ('n', False, 'No, abort the %s' % text)]

  if count > 20:

    choices.insert(1, ('v', 'v', 'View the list of affected instances'))

    ask = msg

  else:

    ask = msg + affected

  choice = AskUser(ask, choices)

  if choice == 'v':

    choices.pop(1)

    choice = AskUser(msg + affected, choices)

  return choice

def _TransformPath(user_input):

  """Transform a user path into a canonical value.

  This function transforms the a path passed as textual information

  into the constants that the LU code expects.

  """

  if user_input:

    if user_input.lower() == "default":

      result_path = constants.VALUE_DEFAULT

    elif user_input.lower() == "none":

      result_path = constants.VALUE_NONE

    else:

      if not os.path.isabs(user_input):

        raise errors.OpPrereqError("Path '%s' is not an absolute filename" %

                                   user_input)

      result_path = user_input

  else:

    result_path = constants.VALUE_DEFAULT

  return result_path

def _EnsureInstancesExist(client, names):

  """Check for and ensure the given instance names exist.

  This function will raise an OpPrereqError in case they don't

  exist. Otherwise it will exit cleanly.

  @type client: L{luxi.Client}

  @param client: the client to use for the query

  @type names: list

  @param names: the list of instance names to query

  @raise errors.OpPrereqError: in case any instance is missing

  """

  # TODO: change LUQueryInstances to that it actually returns None

  # instead of raising an exception, or devise a better mechanism

  result = client.QueryInstances(names, ["name"], False)

  for orig_name, row in zip(names, result):

    if row[0] is None:

      raise errors.OpPrereqError("Instance '%s' does not exist" % orig_name)

def ListInstances(opts, args):

  """List instances 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

  """

  if opts.output is None:

    selected_fields = _LIST_DEF_FIELDS

  elif opts.output.startswith("+"):

    selected_fields = _LIST_DEF_FIELDS + opts.output[1:].split(",")

  else:

    selected_fields = opts.output.split(",")

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

  if not opts.no_headers:

    headers = {

      "name": "Instance", "os": "OS", "pnode": "Primary_node",

      "snodes": "Secondary_Nodes", "admin_state": "Autostart",

      "oper_state": "Running",

      "oper_ram": "Memory", "disk_template": "Disk_template",

      "ip": "IP_address", "mac": "MAC_address",

      "bridge": "Bridge",

      "sda_size": "Disk/0", "sdb_size": "Disk/1",

      "disk_usage": "DiskUsage",

      "status": "Status", "tags": "Tags",

      "network_port": "Network_port",

      "hv/kernel_path": "Kernel_path",

      "hv/initrd_path": "Initrd_path",

      "hv/boot_order": "HVM_boot_order",

      "hv/acpi": "HVM_ACPI",

      "hv/pae": "HVM_PAE",

      "hv/cdrom_image_path": "HVM_CDROM_image_path",

      "hv/nic_type": "HVM_NIC_type",

      "hv/disk_type": "HVM_Disk_type",

      "hv/vnc_bind_address": "VNC_bind_address",

      "serial_no": "SerialNo", "hypervisor": "Hypervisor",

      "hvparams": "Hypervisor_parameters",

      "be/memory": "Configured_memory",

      "be/vcpus": "VCPUs",

      "be/auto_balance": "Auto_balance",

      "disk.count": "Disks", "disk.sizes": "Disk_sizes",

      "nic.count": "NICs", "nic.ips": "NIC_IPs",

      "nic.bridges": "NIC_bridges", "nic.macs": "NIC_MACs",

      }

  else:

    headers = None

  unitfields = ["be/memory", "oper_ram", "sd(a|b)_size", "disk\.size/.*"]

  numfields = ["be/memory", "oper_ram", "sd(a|b)_size", "be/vcpus",

               "serial_no", "(disk|nic)\.count", "disk\.size/.*"]

  list_type_fields = ("tags", "disk.sizes",

                      "nic.macs", "nic.ips", "nic.bridges")

  # change raw values to nicer strings

  for row in output:

    for idx, field in enumerate(selected_fields):

      val = row[idx]

      if field == "snodes":

        val = ",".join(val) or "-"

      elif field == "admin_state":

        if val:

          val = "yes"

        else:

          val = "no"

      elif field == "oper_state":

        if val is None:

          val = "(node down)"

        elif val: # True

          val = "running"

        else:

          val = "stopped"

      elif field == "oper_ram":

        if val is None:

          val = "(node down)"

      elif field == "sda_size" or field == "sdb_size":

        if val is None:

          val = "N/A"

      elif field in list_type_fields:

        val = ",".join(str(item) for item in val)

      elif val is None:

        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 AddInstance(opts, args):

  """Add an instance 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 instance name

  @rtype: int

  @return: the desired exit code

  """

  instance = args[0]

  (pnode, snode) = SplitNodeOption(opts.node)

  hypervisor = None

  hvparams = {}

  if opts.hypervisor:

    hypervisor, hvparams = opts.hypervisor

  if opts.nics:

    try:

      nic_max = max(int(nidx[0])+1 for nidx in opts.nics)

    except ValueError, err:

      raise errors.OpPrereqError("Invalid NIC index passed: %s" % str(err))

    nics = [{}] * nic_max

    for nidx, ndict in opts.nics.items():

      nidx = int(nidx)

      nics[nidx] = ndict

  elif opts.no_nics:

    # no nics

    nics = []

  else:

    # default of one nic, all auto

    nics = [{}]

  if opts.disk_template == constants.DT_DISKLESS:

    if opts.disks or opts.sd_size is not None:

      raise errors.OpPrereqError("Diskless instance but disk"

                                 " information passed")

    disks = []

  else:

    if not opts.disks and not opts.sd_size:

      raise errors.OpPrereqError("No disk information specified")

    if opts.disks and opts.sd_size is not None:

      raise errors.OpPrereqError("Please use either the '--disk' or"

                                 " '-s' option")

    if opts.sd_size is not None:

      opts.disks = [(0, {"size": opts.sd_size})]

    try:

      disk_max = max(int(didx[0])+1 for didx in opts.disks)

    except ValueError, err:

      raise errors.OpPrereqError("Invalid disk index passed: %s" % str(err))

    disks = [{}] * disk_max

    for didx, ddict in opts.disks:

      didx = int(didx)

      if "size" not in ddict:

        raise errors.OpPrereqError("Missing size for disk %d" % didx)

      try:

        ddict["size"] = utils.ParseUnit(ddict["size"])

      except ValueError, err:

        raise errors.OpPrereqError("Invalid disk size for disk %d: %s" %

                                   (didx, err))

      disks[didx] = ddict

  utils.ForceDictType(opts.beparams, constants.BES_PARAMETER_TYPES)

  utils.ForceDictType(hvparams, constants.HVS_PARAMETER_TYPES)

  op = opcodes.OpCreateInstance(instance_name=instance,

                                disks=disks,

                                disk_template=opts.disk_template,

                                nics=nics,

                                mode=constants.INSTANCE_CREATE,

                                os_type=opts.os, pnode=pnode,

                                snode=snode,

                                start=opts.start, ip_check=opts.ip_check,

                                wait_for_sync=opts.wait_for_sync,

                                hypervisor=hypervisor,

                                hvparams=hvparams,

                                beparams=opts.beparams,

                                iallocator=opts.iallocator,

                                file_storage_dir=opts.file_storage_dir,

                                file_driver=opts.file_driver,

                                )

  SubmitOrSend(op, opts)

  return 0

def BatchCreate(opts, args):

  """Create instances using a definition file.

  This function reads a json file with instances defined

  in the form::

    {"instance-name":{

      "disk_size": [20480],

      "template": "drbd",

      "backend": {

        "memory": 512,

        "vcpus": 1 },

      "os": "debootstrap",

      "primary_node": "firstnode",

      "secondary_node": "secondnode",

      "iallocator": "dumb"}

    }

  Note that I{primary_node} and I{secondary_node} have precedence over

  I{iallocator}.

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

  @type args: list

  @param args: should contain one element, the json filename

  @rtype: int

  @return: the desired exit code

  """

  _DEFAULT_SPECS = {"disk_size": [20 * 1024],

                    "backend": {},

                    "iallocator": None,

                    "primary_node": None,

                    "secondary_node": None,

                    "ip": 'none',

                    "mac": 'auto',

                    "bridge": None,

                    "start": True,

                    "ip_check": True,

                    "hypervisor": None,

                    "hvparams": {},

                    "file_storage_dir": None,

                    "file_driver": 'loop'}

  def _PopulateWithDefaults(spec):

    """Returns a new hash combined with default values."""

    mydict = _DEFAULT_SPECS.copy()

    mydict.update(spec)

    return mydict

  def _Validate(spec):

    """Validate the instance specs."""

    # Validate fields required under any circumstances

    for required_field in ('os', 'template'):

      if required_field not in spec:

        raise errors.OpPrereqError('Required field "%s" is missing.' %

                                   required_field)

    # Validate special fields

    if spec['primary_node'] is not None:

      if (spec['template'] in constants.DTS_NET_MIRROR and

          spec['secondary_node'] is None):

        raise errors.OpPrereqError('Template requires secondary node, but'

                                   ' there was no secondary provided.')

    elif spec['iallocator'] is None:

      raise errors.OpPrereqError('You have to provide at least a primary_node'

                                 ' or an iallocator.')

    if (spec['hvparams'] and

        not isinstance(spec['hvparams'], dict)):

      raise errors.OpPrereqError('Hypervisor parameters must be a dict.')

  json_filename = args[0]

  try:

    fd = open(json_filename, 'r')

    instance_data = simplejson.load(fd)

    fd.close()

  except Exception, err:

    ToStderr("Can't parse the instance definition file: %s" % str(err))

    return 1

  # Iterate over the instances and do:

  #  * Populate the specs with default value

  #  * Validate the instance specs

  i_names = utils.NiceSort(instance_data.keys())

  for name in i_names:

    specs = instance_data[name]

    specs = _PopulateWithDefaults(specs)

    _Validate(specs)

    hypervisor = specs['hypervisor']

    hvparams = specs['hvparams']

    disks = []

    for elem in specs['disk_size']:

      try:

        size = utils.ParseUnit(elem)

      except ValueError, err:

        raise errors.OpPrereqError("Invalid disk size '%s' for"

                                   " instance %s: %s" %

                                   (elem, name, err))

      disks.append({"size": size})

    nic0 = {'ip': specs['ip'], 'bridge': specs['bridge'], 'mac': specs['mac']}

    utils.ForceDictType(specs['backend'], constants.BES_PARAMETER_TYPES)

    utils.ForceDictType(hvparams, constants.HVS_PARAMETER_TYPES)

    op = opcodes.OpCreateInstance(instance_name=name,

                                  disks=disks,

                                  disk_template=specs['template'],

                                  mode=constants.INSTANCE_CREATE,

                                  os_type=specs['os'],

                                  pnode=specs['primary_node'],

                                  snode=specs['secondary_node'],

                                  nics=[nic0],

                                  start=specs['start'],

                                  ip_check=specs['ip_check'],

                                  wait_for_sync=True,

                                  iallocator=specs['iallocator'],

                                  hypervisor=hypervisor,

                                  hvparams=hvparams,

                                  beparams=specs['backend'],

                                  file_storage_dir=specs['file_storage_dir'],

                                  file_driver=specs['file_driver'])

    ToStdout("%s: %s", name, cli.SendJob([op]))

  return 0

def ReinstallInstance(opts, args):

  """Reinstall an instance.

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

  @type args: list

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

      instance to be reinstalled

  @rtype: int

  @return: the desired exit code

  """

  instance_name = args[0]

  if opts.select_os is True:

    op = opcodes.OpDiagnoseOS(output_fields=["name", "valid"], names=[])

    result = SubmitOpCode(op)

    if not result:

      ToStdout("Can't get the OS list")

      return 1

    ToStdout("Available OS templates:")

    number = 0

    choices = []

    for entry in result:

      ToStdout("%3s: %s", number, entry[0])

      choices.append(("%s" % number, entry[0], entry[0]))

      number = number + 1

    choices.append(('x', 'exit', 'Exit gnt-instance reinstall'))

    selected = AskUser("Enter OS template name or number (or x to abort):",

                       choices)

    if selected == 'exit':

      ToStdout("User aborted reinstall, exiting")

      return 1

    os_name = selected

  else:

    os_name = opts.os

  if not opts.force:

    usertext = ("This will reinstall the instance %s and remove"

                " all data. Continue?") % instance_name

    if not AskUser(usertext):

      return 1

  op = opcodes.OpReinstallInstance(instance_name=instance_name,

                                   os_type=os_name)

  SubmitOrSend(op, opts)

  return 0

def RemoveInstance(opts, args):

  """Remove an instance.

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

  @type args: list

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

      the instance to be removed

  @rtype: int

  @return: the desired exit code

  """

  instance_name = args[0]

  force = opts.force

  cl = GetClient()

  if not force:

    _EnsureInstancesExist(cl, [instance_name])

    usertext = ("This will remove the volumes of the instance %s"

                " (including mirrors), thus removing all the data"

                " of the instance. Continue?") % instance_name

    if not AskUser(usertext):

      return 1

  op = opcodes.OpRemoveInstance(instance_name=instance_name,

                                ignore_failures=opts.ignore_failures)

  SubmitOrSend(op, opts, cl=cl)

  return 0

def RenameInstance(opts, args):

  """Rename an instance.

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

  @type args: list

  @param args: should contain two elements, the old and the

      new instance names

  @rtype: int

  @return: the desired exit code

  """

  op = opcodes.OpRenameInstance(instance_name=args[0],

                                new_name=args[1],

                                ignore_ip=opts.ignore_ip)

  SubmitOrSend(op, opts)

  return 0

def ActivateDisks(opts, args):

  """Activate an instance's disks.

  This serves two purposes:

    - it allows (as long as the instance is not running)

      mounting the disks and modifying them from the node

    - it repairs inactive secondary drbds

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

  @type args: list

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

  @rtype: int

  @return: the desired exit code

  """

  instance_name = args[0]

  op = opcodes.OpActivateInstanceDisks(instance_name=instance_name)

  disks_info = SubmitOrSend(op, opts)

  for host, iname, nname in disks_info:

    ToStdout("%s:%s:%s", host, iname, nname)

  return 0

def DeactivateDisks(opts, args):

  """Deactivate an instance's disks..

  This function takes the instance name, looks for its primary node

  and the tries to shutdown its block devices on that node.

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

  @type args: list

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

  @rtype: int

  @return: the desired exit code

  """

  instance_name = args[0]

  op = opcodes.OpDeactivateInstanceDisks(instance_name=instance_name)

  SubmitOrSend(op, opts)

  return 0

def GrowDisk(opts, args):

  """Grow an instance's disks.

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

  @type args: list

  @param args: should contain two elements, the instance name

      whose disks we grow and the disk name, e.g. I{sda}

  @rtype: int

  @return: the desired exit code

  """

  instance = args[0]

  disk = args[1]

  try:

    disk = int(disk)

  except ValueError, err:

    raise errors.OpPrereqError("Invalid disk index: %s" % str(err))

  amount = utils.ParseUnit(args[2])

  op = opcodes.OpGrowDisk(instance_name=instance, disk=disk, amount=amount,

                          wait_for_sync=opts.wait_for_sync)

  SubmitOrSend(op, opts)

  return 0

def StartupInstance(opts, args):

  """Startup instances.

  Depending on the options given, this will start one or more

  instances.

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

  @type args: list

  @param args: the instance or node names based on which we

      create the final selection (in conjunction with the

      opts argument)

  @rtype: int

  @return: the desired exit code

  """

  cl = GetClient()

  if opts.multi_mode is None:

    opts.multi_mode = _SHUTDOWN_INSTANCES

  inames = _ExpandMultiNames(opts.multi_mode, args, client=cl)

  if not inames:

    raise errors.OpPrereqError("Selection filter does not match any instances")

  multi_on = opts.multi_mode != _SHUTDOWN_INSTANCES or len(inames) > 1

  if not (opts.force_multi or not multi_on

          or _ConfirmOperation(inames, "startup")):

    return 1

  jex = cli.JobExecutor(verbose=multi_on, cl=cl)

  for name in inames:

    op = opcodes.OpStartupInstance(instance_name=name,

                                   force=opts.force)

    jex.QueueJob(name, op)

  jex.WaitOrShow(not opts.submit_only)

  return 0

def RebootInstance(opts, args):

  """Reboot instance(s).

  Depending on the parameters given, this will reboot one or more

  instances.

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

  @type args: list

  @param args: the instance or node names based on which we

      create the final selection (in conjunction with the

      opts argument)

  @rtype: int

  @return: the desired exit code

  """

  cl = GetClient()

  if opts.multi_mode is None:

    opts.multi_mode = _SHUTDOWN_INSTANCES

  inames = _ExpandMultiNames(opts.multi_mode, args, client=cl)

  if not inames:

    raise errors.OpPrereqError("Selection filter does not match any instances")

  multi_on = opts.multi_mode != _SHUTDOWN_INSTANCES or len(inames) > 1

  if not (opts.force_multi or not multi_on

          or _ConfirmOperation(inames, "reboot")):

    return 1

  jex = JobExecutor(verbose=multi_on, cl=cl)

  for name in inames:

    op = opcodes.OpRebootInstance(instance_name=name,

                                  reboot_type=opts.reboot_type,

                                  ignore_secondaries=opts.ignore_secondaries)

    jex.QueueJob(name, op)

  jex.WaitOrShow(not opts.submit_only)

  return 0

def ShutdownInstance(opts, args):

  """Shutdown an instance.

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

  @type args: list

  @param args: the instance or node names based on which we

      create the final selection (in conjunction with the

      opts argument)

  @rtype: int

  @return: the desired exit code

  """

  cl = GetClient()

  if opts.multi_mode is None:

    opts.multi_mode = _SHUTDOWN_INSTANCES

  inames = _ExpandMultiNames(opts.multi_mode, args, client=cl)

  if not inames:

    raise errors.OpPrereqError("Selection filter does not match any instances")

  multi_on = opts.multi_mode != _SHUTDOWN_INSTANCES or len(inames) > 1

  if not (opts.force_multi or not multi_on

          or _ConfirmOperation(inames, "shutdown")):

    return 1

  jex = cli.JobExecutor(verbose=multi_on, cl=cl)

  for name in inames:

    op = opcodes.OpShutdownInstance(instance_name=name)

    jex.QueueJob(name, op)

  jex.WaitOrShow(not opts.submit_only)

  return 0

def ReplaceDisks(opts, args):

  """Replace the disks of an instance

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

  @type args: list

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

  @rtype: int

  @return: the desired exit code

  """

  instance_name = args[0]

  new_2ndary = opts.new_secondary

  iallocator = opts.iallocator

  if opts.disks is None:

    disks = []

  else:

    try:

      disks = [int(i) for i in opts.disks.split(",")]

    except ValueError, err:

      raise errors.OpPrereqError("Invalid disk index passed: %s" % str(err))

  cnt = [opts.on_primary, opts.on_secondary,

         new_2ndary is not None, iallocator is not None].count(True)

  if cnt != 1:

    raise errors.OpPrereqError("One and only one of the -p, -s, -n and -i"

                               " options must be passed")

  elif opts.on_primary:

    mode = constants.REPLACE_DISK_PRI

  elif opts.on_secondary:

    mode = constants.REPLACE_DISK_SEC

  elif new_2ndary is not None or iallocator is not None:

    # replace secondary

    mode = constants.REPLACE_DISK_CHG

  op = opcodes.OpReplaceDisks(instance_name=args[0], disks=disks,

                              remote_node=new_2ndary, mode=mode,

                              iallocator=iallocator)

  SubmitOrSend(op, opts)

  return 0

def FailoverInstance(opts, args):

  """Failover an instance.

  The failover is done by shutting it down on its present node and

  starting it on the secondary.

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

  @type args: list

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

  @rtype: int

  @return: the desired exit code

  """

  cl = GetClient()

  instance_name = args[0]

  force = opts.force

  if not force:

    _EnsureInstancesExist(cl, [instance_name])

    usertext = ("Failover will happen to image %s."

                " This requires a shutdown of the instance. Continue?" %

                (instance_name,))

    if not AskUser(usertext):

      return 1

  op = opcodes.OpFailoverInstance(instance_name=instance_name,

                                  ignore_consistency=opts.ignore_consistency)

  SubmitOrSend(op, opts, cl=cl)

  return 0

def MigrateInstance(opts, args):

  """Migrate an instance.

  The migrate is done without shutdown.

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

  @type args: list

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

  @rtype: int

  @return: the desired exit code

  """

  cl = GetClient()

  instance_name = args[0]

  force = opts.force

  if not force:

    _EnsureInstancesExist(cl, [instance_name])

    if opts.cleanup:

      usertext = ("Instance %s will be recovered from a failed migration."

                  " Note that the migration procedure (including cleanup)" %

                  (instance_name,))

    else:

      usertext = ("Instance %s will be migrated. Note that migration" %

                  (instance_name,))

    usertext += (" is **experimental** in this version."

                " This might impact the instance if anything goes wrong."

                " Continue?")

    if not AskUser(usertext):

      return 1

  op = opcodes.OpMigrateInstance(instance_name=instance_name, live=opts.live,

                                 cleanup=opts.cleanup)

  SubmitOpCode(op, cl=cl)

  return 0

def ConnectToInstanceConsole(opts, args):

  """Connect to the console of an instance.

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

  @type args: list

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

  @rtype: int

  @return: the desired exit code

  """

  instance_name = args[0]

  op = opcodes.OpConnectConsole(instance_name=instance_name)

  cmd = SubmitOpCode(op)

  if opts.show_command:

    ToStdout("%s", utils.ShellQuoteArgs(cmd))

  else:

    try:

      os.execvp(cmd[0], cmd)

    finally:

      ToStderr("Can't run console command %s with arguments:\n'%s'",

               cmd[0], " ".join(cmd))

      os._exit(1)

def _FormatLogicalID(dev_type, logical_id):

  """Formats the logical_id of a disk.

  """

  if dev_type == constants.LD_DRBD8:

    node_a, node_b, port, minor_a, minor_b, key = logical_id

    data = [

      ("nodeA", "%s, minor=%s" % (node_a, minor_a)),

      ("nodeB", "%s, minor=%s" % (node_b, minor_b)),

      ("port", port),

      ("auth key", key),

      ]

  elif dev_type == constants.LD_LV:

    vg_name, lv_name = logical_id

    data = ["%s/%s" % (vg_name, lv_name)]

  else:

    data = [str(logical_id)]

  return data

def _FormatBlockDevInfo(idx, top_level, dev, static):

  """Show block device information.

  This is only used by L{ShowInstanceConfig}, but it's too big to be

  left for an inline definition.

  @type idx: int

  @param idx: the index of the current disk

  @type top_level: boolean

  @param top_level: if this a top-level disk?

  @type dev: dict

  @param dev: dictionary with disk information

  @type static: boolean

  @param static: wheter the device information doesn't contain

      runtime information but only static data

  @return: a list of either strings, tuples or lists

      (which should be formatted at a higher indent level)

  """

  def helper(dtype, status):

    """Format one line for physical device status.

    @type dtype: str

    @param dtype: a constant from the L{constants.LDS_BLOCK} set

    @type status: tuple

    @param status: a tuple as returned from L{backend.FindBlockDevice}

    @return: the string representing the status

    """

    if not status:

      return "not active"

    txt = ""

    (path, major, minor, syncp, estt, degr, ldisk) = status

    if major is None:

      major_string = "N/A"

    else:

      major_string = str(major)

    if minor is None:

      minor_string = "N/A"

    else:

      minor_string = str(minor)

    txt += ("%s (%s:%s)" % (path, major_string, minor_string))

    if dtype in (constants.LD_DRBD8, ):

      if syncp is not None:

        sync_text = "*RECOVERING* %5.2f%%," % syncp

        if estt:

          sync_text += " ETA %ds" % estt

        else:

          sync_text += " ETA unknown"

      else:

        sync_text = "in sync"

      if degr:

        degr_text = "*DEGRADED*"

      else:

        degr_text = "ok"

      if ldisk:

        ldisk_text = " *MISSING DISK*"

      else:

        ldisk_text = ""

      txt += (" %s, status %s%s" % (sync_text, degr_text, ldisk_text))

    elif dtype == constants.LD_LV:

      if ldisk:

        ldisk_text = " *FAILED* (failed drive?)"

      else:

        ldisk_text = ""

      txt += ldisk_text

    return txt

  # the header

  if top_level:

    if dev["iv_name"] is not None:

      txt = dev["iv_name"]

    else:

      txt = "disk %d" % idx

  else:

    txt = "child %d" % idx

  d1 = ["- %s: %s" % (txt, dev["dev_type"])]

  data = []

  if top_level:

    data.append(("access mode", dev["mode"]))

  if dev["logical_id"] is not None:

    try:

      l_id = _FormatLogicalID(dev["dev_type"], dev["logical_id"])

    except ValueError:

      l_id = [str(dev["logical_id"])]

    if len(l_id) == 1:

      data.append(("logical_id", l_id[0]))

    else:

      data.extend(l_id)

  elif dev["physical_id"] is not None:

    data.append("physical_id:")

    data.append([dev["physical_id"]])

  if not static:

    data.append(("on primary", helper(dev["dev_type"], dev["pstatus"])))

  if dev["sstatus"] and not static:

    data.append(("on secondary", helper(dev["dev_type"], dev["sstatus"])))

  if dev["children"]:

    data.append("child devices:")

    for c_idx, child in enumerate(dev["children"]):

      data.append(_FormatBlockDevInfo(c_idx, False, child, static))

  d1.append(data)

  return d1

def _FormatList(buf, data, indent_level):

  """Formats a list of data at a given indent level.

  If the element of the list is:

    - a string, it is simply formatted as is

    - a tuple, it will be split into key, value and the all the

      values in a list will be aligned all at the same start column

    - a list, will be recursively formatted

  @type buf: StringIO

  @param buf: the buffer into which we write the output

  @param data: the list to format

  @type indent_level: int

  @param indent_level: the indent level to format at

  """

  max_tlen = max([len(elem[0]) for elem in data

                 if isinstance(elem, tuple)] or [0])

  for elem in data:

    if isinstance(elem, basestring):

      buf.write("%*s%s\n" % (2*indent_level, "", elem))

    elif isinstance(elem, tuple):

      key, value = elem

      spacer = "%*s" % (max_tlen - len(key), "")

      buf.write("%*s%s:%s %s\n" % (2*indent_level, "", key, spacer, value))

    elif isinstance(elem, list):

      _FormatList(buf, elem, indent_level+1)

def ShowInstanceConfig(opts, args):

  """Compute instance run-time status.

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

  @type args: list

  @param args: either an empty list, and then we query all

      instances, or should contain a list of instance names

  @rtype: int

  @return: the desired exit code

  """

  retcode = 0

  op = opcodes.OpQueryInstanceData(instances=args, static=opts.static)

  result = SubmitOpCode(op)

  if not result:

    ToStdout("No instances.")

    return 1

  buf = StringIO()

  retcode = 0

  for instance_name in result:

    instance = result[instance_name]

    buf.write("Instance name: %s\n" % instance["name"])

    buf.write("State: configured to be %s" % instance["config_state"])

    if not opts.static:

      buf.write(", actual state is %s" % instance["run_state"])

    buf.write("\n")

    ##buf.write("Considered for memory checks in cluster verify: %s\n" %

    ##          instance["auto_balance"])

    buf.write("  Nodes:\n")

    buf.write("    - primary: %s\n" % instance["pnode"])

    buf.write("    - secondaries: %s\n" % ", ".join(instance["snodes"]))

    buf.write("  Operating system: %s\n" % instance["os"])

    if instance.has_key("network_port"):

      buf.write("  Allocated network port: %s\n" % instance["network_port"])

    buf.write("  Hypervisor: %s\n" % instance["hypervisor"])

    # custom VNC console information

    vnc_bind_address = instance["hv_actual"].get(constants.HV_VNC_BIND_ADDRESS,

                                                 None)

    if vnc_bind_address:

      port = instance["network_port"]

      display = int(port) - constants.VNC_BASE_PORT

      if display > 0 and vnc_bind_address == constants.BIND_ADDRESS_GLOBAL:

        vnc_console_port = "%s:%s (display %s)" % (instance["pnode"],

                                                   port,

                                                   display)

      elif display > 0 and utils.IsValidIP(vnc_bind_address):

        vnc_console_port = ("%s:%s (node %s) (display %s)" %

                             (vnc_bind_address, port,

                              instance["pnode"], display))

      else:

        # vnc bind address is a file

        vnc_console_port = "%s:%s" % (instance["pnode"],

                                      vnc_bind_address)

      buf.write("    - console connection: vnc to %s\n" % vnc_console_port)

    for key in instance["hv_actual"]:

      if key in instance["hv_instance"]:

        val = instance["hv_instance"][key]

      else:

        val = "default (%s)" % instance["hv_actual"][key]

      buf.write("    - %s: %s\n" % (key, val))

    buf.write("  Hardware:\n")

    buf.write("    - VCPUs: %d\n" %

              instance["be_actual"][constants.BE_VCPUS])

    buf.write("    - memory: %dMiB\n" %

              instance["be_actual"][constants.BE_MEMORY])

    buf.write("    - NICs:\n")

    for idx, (mac, ip, bridge) in enumerate(instance["nics"]):

      buf.write("      - nic/%d: MAC: %s, IP: %s, bridge: %s\n" %

                (idx, mac, ip, bridge))

    buf.write("  Disks:\n")

    for idx, device in enumerate(instance["disks"]):

      _FormatList(buf, _FormatBlockDevInfo(idx, True, device, opts.static), 2)

  ToStdout(buf.getvalue().rstrip('\n'))

  return retcode

def SetInstanceParams(opts, args):

  """Modifies an instance.

  All parameters take effect only at the next restart of the instance.

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

  @type args: list

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

  @rtype: int

  @return: the desired exit code

  """

  if not (opts.nics or opts.disks or

          opts.hypervisor or opts.beparams):

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

    return 1

  for param in opts.beparams:

    if isinstance(opts.beparams[param], basestring):

      if opts.beparams[param].lower() == "default":

        opts.beparams[param] = constants.VALUE_DEFAULT

  utils.ForceDictType(opts.beparams, constants.BES_PARAMETER_TYPES,

                      allowed_values=[constants.VALUE_DEFAULT])

  for param in opts.hypervisor:

    if isinstance(opts.hypervisor[param], basestring):

      if opts.hypervisor[param].lower() == "default":

        opts.hypervisor[param] = constants.VALUE_DEFAULT

  utils.ForceDictType(opts.hypervisor, constants.HVS_PARAMETER_TYPES,

                      allowed_values=[constants.VALUE_DEFAULT])

  for idx, (nic_op, nic_dict) in enumerate(opts.nics):

    try:

      nic_op = int(nic_op)

      opts.nics[idx] = (nic_op, nic_dict)

    except ValueError:

      pass

  for idx, (disk_op, disk_dict) in enumerate(opts.disks):

    try:

      disk_op = int(disk_op)

      opts.disks[idx] = (disk_op, disk_dict)

    except ValueError:

      pass

    if disk_op == constants.DDM_ADD:

      if 'size' not in disk_dict:

        raise errors.OpPrereqError("Missing required parameter 'size'")

      disk_dict['size'] = utils.ParseUnit(disk_dict['size'])

  op = opcodes.OpSetInstanceParams(instance_name=args[0],

                                   nics=opts.nics,

                                   disks=opts.disks,

                                   hvparams=opts.hypervisor,

                                   beparams=opts.beparams,

                                   force=opts.force)

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

  result = SubmitOrSend(op, opts)

  if result:

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

    for param, data in result:

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

    ToStdout("Please don't forget that these parameters take effect"

             " only at the next start of the instance.")

  return 0

# options used in more than one cmd

node_opt = make_option("-n", "--node", dest="node", help="Target node",

                       metavar="<node>")

os_opt = cli_option("-o", "--os-type", dest="os", help="What OS to run",

                    metavar="<os>")

# multi-instance selection options

m_force_multi = make_option("--force-multiple", dest="force_multi",

                            help="Do not ask for confirmation when more than"

                            " one instance is affected",

                            action="store_true", default=False)

m_pri_node_opt = make_option("--primary", dest="multi_mode",

                             help="Filter by nodes (primary only)",

                             const=_SHUTDOWN_NODES_PRI, action="store_const")

m_sec_node_opt = make_option("--secondary", dest="multi_mode",

                             help="Filter by nodes (secondary only)",

                             const=_SHUTDOWN_NODES_SEC, action="store_const")

m_node_opt = make_option("--node", dest="multi_mode",

                         help="Filter by nodes (primary and secondary)",

                         const=_SHUTDOWN_NODES_BOTH, action="store_const")

m_clust_opt = make_option("--all", dest="multi_mode",

                          help="Select all instances in the cluster",

                          const=_SHUTDOWN_CLUSTER, action="store_const")

m_inst_opt = make_option("--instance", dest="multi_mode",

                         help="Filter by instance name [default]",

                         const=_SHUTDOWN_INSTANCES, action="store_const")

# this is defined separately due to readability only

add_opts = [

  DEBUG_OPT,

  make_option("-n", "--node", dest="node",

              help="Target node and optional secondary node",

              metavar="<pnode>[:<snode>]"),

  os_opt,

  keyval_option("-B", "--backend", dest="beparams",

                type="keyval", default={},

                help="Backend parameters"),

  make_option("-t", "--disk-template", dest="disk_template",

              help="Custom disk setup (diskless, file, plain or drbd)",

              default=None, metavar="TEMPL"),

  cli_option("-s", "--os-size", dest="sd_size", help="Disk size for a"

             " single-disk configuration, when not using the --disk option,"

             " in MiB unless a suffix is used",

             default=None, type="unit", metavar="<size>"),

  ikv_option("--disk", help="Disk information",

             default=[], dest="disks",

             action="append",

             type="identkeyval"),

  ikv_option("--net", help="NIC information",

             default=[], dest="nics",

             action="append",

             type="identkeyval"),

  make_option("--no-nics", default=False, action="store_true",

              help="Do not create any network cards for the instance"),

  make_option("--no-wait-for-sync", dest="wait_for_sync", default=True,

              action="store_false", help="Don't wait for sync (DANGEROUS!)"),

  make_option("--no-start", dest="start", default=True,

              action="store_false", help="Don't start the instance after"

              " creation"),

  make_option("--no-ip-check", dest="ip_check", default=True,

              action="store_false", help="Don't check that the instance's IP"

              " is alive (only valid with --no-start)"),

  make_option("--file-storage-dir", dest="file_storage_dir",

              help="Relative path under default cluster-wide file storage dir"

              " to store file-based disks", default=None,

              metavar="<DIR>"),

  make_option("--file-driver", dest="file_driver", help="Driver to use"

              " for image files", default="loop", metavar="<DRIVER>"),

  make_option("-I", "--iallocator", metavar="<NAME>",

              help="Select nodes for the instance automatically using the"

              " <NAME> iallocator plugin", default=None, type="string"),

  ikv_option("-H", "--hypervisor", dest="hypervisor",

              help="Hypervisor and hypervisor options, in the format"

              " hypervisor:option=value,option=value,...", default=None,

              type="identkeyval"),

  SUBMIT_OPT,

  ]

commands = {

  'add': (AddInstance, ARGS_ONE, add_opts,

          "[...] -t disk-type -n node[:secondary-node] -o os-type <name>",

          "Creates and adds a new instance to the cluster"),

  'batch-create': (BatchCreate, ARGS_ONE,

                   [DEBUG_OPT],

                   "<instances_file.json>",

                   "Create a bunch of instances based on specs in the file."),

  'console': (ConnectToInstanceConsole, ARGS_ONE,

              [DEBUG_OPT,

               make_option("--show-cmd", dest="show_command",

                           action="store_true", default=False,

                           help=("Show command instead of executing it"))],

              "[--show-cmd] <instance>",

              "Opens a console on the specified instance"),

  'failover': (FailoverInstance, ARGS_ONE,

               [DEBUG_OPT, FORCE_OPT,

                make_option("--ignore-consistency", dest="ignore_consistency",

                            action="store_true", default=False,

                            help="Ignore the consistency of the disks on"

                            " the secondary"),

                SUBMIT_OPT,

                ],

               "[-f] <instance>",

               "Stops the instance and starts it on the backup node, using"

               " the remote mirror (only for instances of type drbd)"),

  'migrate': (MigrateInstance, ARGS_ONE,

               [DEBUG_OPT, FORCE_OPT,

                make_option("--non-live", dest="live",

                            default=True, action="store_false",

                            help="Do a non-live migration (this usually means"

                            " freeze the instance, save the state,"

                            " transfer and only then resume running on the"

                            " secondary node)"),

                make_option("--cleanup", dest="cleanup",

                            default=False, action="store_true",

                            help="Instead of performing the migration, try to"

                            " recover from a failed cleanup. This is safe"

                            " to run even if the instance is healthy, but it"

                            " will create extra replication traffic and "

                            " disrupt briefly the replication (like during the"

                            " migration"),

                ],

               "[-f] <instance>",

               "Migrate instance to its secondary node"

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

  'info': (ShowInstanceConfig, ARGS_ANY,

           [DEBUG_OPT,

            make_option("-s", "--static", dest="static",

                        action="store_true", default=False,

                        help="Only show configuration data, not runtime data"),

            ], "[-s] [<instance>...]",

           "Show information on the specified instance(s)"),

  'list': (ListInstances, ARGS_ANY,

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

           "[<instance>...]",

           "Lists the instances and their status. The available fields are"

           " (see the man page for details): status, oper_state, oper_ram,"

           " name, os, pnode, snodes, admin_state, admin_ram, disk_template,"

           " ip, mac, bridge, sda_size, sdb_size, vcpus, serial_no,"

           " hypervisor."

           " The default field"

           " list is (in order): %s." % ", ".join(_LIST_DEF_FIELDS),

           ),

  'reinstall': (ReinstallInstance, ARGS_ONE,

                [DEBUG_OPT, FORCE_OPT, os_opt,

                 make_option("--select-os", dest="select_os",

                             action="store_true", default=False,

                             help="Interactive OS reinstall, lists available"

                             " OS templates for selection"),

                 SUBMIT_OPT,

                 ],

                "[-f] <instance>", "Reinstall a stopped instance"),

  'remove': (RemoveInstance, ARGS_ONE,

             [DEBUG_OPT, FORCE_OPT,

              make_option("--ignore-failures", dest="ignore_failures",

                          action="store_true", default=False,

                          help=("Remove the instance from the cluster even"

                                " if there are failures during the removal"

                                " process (shutdown, disk removal, etc.)")),

              SUBMIT_OPT,

              ],

             "[-f] <instance>", "Shuts down the instance and removes it"),

  'rename': (RenameInstance, ARGS_FIXED(2),

             [DEBUG_OPT,

              make_option("--no-ip-check", dest="ignore_ip",

                          help="Do not check that the IP of the new name"

                          " is alive",

                          default=False, action="store_true"),

              SUBMIT_OPT,

              ],

             "<instance> <new_name>", "Rename the instance"),

  'replace-disks': (ReplaceDisks, ARGS_ONE,

                    [DEBUG_OPT,

                     make_option("-n", "--new-secondary", dest="new_secondary",

                                 help=("New secondary node (for secondary"

                                       " node change)"), metavar="NODE",

                                 default=None),

                     make_option("-p", "--on-primary", dest="on_primary",

                                 default=False, action="store_true",

                                 help=("Replace the disk(s) on the primary"

                                       " node (only for the drbd template)")),

                     make_option("-s", "--on-secondary", dest="on_secondary",

                                 default=False, action="store_true",

                                 help=("Replace the disk(s) on the secondary"

                                       " node (only for the drbd template)")),

                     make_option("--disks", dest="disks", default=None,

                                 help=("Comma-separated list of disks"

                                       " to replace (e.g. sda) (optional,"

                                       " defaults to all disks")),

                     make_option("-I", "--iallocator", metavar="<NAME>",

                                 help="Select new secondary for the instance"

                                 " automatically using the"

                                 " <NAME> iallocator plugin (enables"

                                 " secondary node replacement)",

                                 default=None, type="string"),

                     SUBMIT_OPT,

                     ],

                    "[-s|-p|-n NODE|-I NAME] <instance>",

                    "Replaces all disks for the instance"),

  'modify': (SetInstanceParams, ARGS_ONE,

             [DEBUG_OPT, FORCE_OPT,

              keyval_option("-H", "--hypervisor", type="keyval",

                            default={}, dest="hypervisor",

                            help="Change hypervisor parameters"),

              keyval_option("-B", "--backend", type="keyval",

                            default={}, dest="beparams",

                            help="Change backend parameters"),

              ikv_option("--disk", help="Disk changes",

                         default=[], dest="disks",

                         action="append",

                         type="identkeyval"),

              ikv_option("--net", help="NIC changes",

                         default=[], dest="nics",

                         action="append",

                         type="identkeyval"),

              SUBMIT_OPT,

              ],

             "<instance>", "Alters the parameters of an instance"),

  'shutdown': (ShutdownInstance, ARGS_ANY,

               [DEBUG_OPT, m_node_opt, m_pri_node_opt, m_sec_node_opt,

                m_clust_opt, m_inst_opt, m_force_multi,

                SUBMIT_OPT,

                ],

               "<instance>", "Stops an instance"),

  'startup': (StartupInstance, ARGS_ANY,

              [DEBUG_OPT, FORCE_OPT, m_force_multi,

               m_node_opt, m_pri_node_opt, m_sec_node_opt,

               m_clust_opt, m_inst_opt,

               SUBMIT_OPT,

               ],

            "<instance>", "Starts an instance"),

  'reboot': (RebootInstance, ARGS_ANY,

              [DEBUG_OPT, m_force_multi,

               make_option("-t", "--type", dest="reboot_type",

                           help="Type of reboot: soft/hard/full",

                           default=constants.INSTANCE_REBOOT_HARD,

                           type="string", metavar="<REBOOT>"),

               make_option("--ignore-secondaries", dest="ignore_secondaries",

                           default=False, action="store_true",

                           help="Ignore errors from secondaries"),

               m_node_opt, m_pri_node_opt, m_sec_node_opt,

               m_clust_opt, m_inst_opt,

               SUBMIT_OPT,

               ],

            "<instance>", "Reboots an instance"),

  'activate-disks': (ActivateDisks, ARGS_ONE, [DEBUG_OPT, SUBMIT_OPT],

                     "<instance>",

                     "Activate an instance's disks"),

  'deactivate-disks': (DeactivateDisks, ARGS_ONE, [DEBUG_OPT, SUBMIT_OPT],

                       "<instance>",

                       "Deactivate an instance's disks"),

  'grow-disk': (GrowDisk, ARGS_FIXED(3),

                [DEBUG_OPT, SUBMIT_OPT,

                 make_option("--no-wait-for-sync",

                             dest="wait_for_sync", default=True,

                             action="store_false",

                             help="Don't wait for sync (DANGEROUS!)"),

                 ],

                "<instance> <disk> <size>", "Grow an instance's disk"),

  'list-tags': (ListTags, ARGS_ONE, [DEBUG_OPT],

                "<instance_name>", "List the tags of the given instance"),

  'add-tags': (AddTags, ARGS_ATLEAST(1), [DEBUG_OPT, TAG_SRC_OPT],

               "<instance_name> tag...", "Add tags to the given instance"),

  'remove-tags': (RemoveTags, ARGS_ATLEAST(1), [DEBUG_OPT, TAG_SRC_OPT],

                  "<instance_name> tag...", "Remove tags from given instance"),

  }

#: dictionary with aliases for commands

aliases = {

  'activate_block_devs': 'activate-disks',

  'replace_disks': 'replace-disks',

  'start': 'startup',

  'stop': 'shutdown',

  }

if __name__ == '__main__':

  sys.exit(GenericMain(commands, aliases=aliases,

                       override={"tag_type": constants.TAG_INSTANCE}))