network.py 22.4 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
#
#

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


"""Logical units dealing with networks."""

from ganeti import constants
from ganeti import errors
from ganeti import locking
from ganeti import network
from ganeti import objects
from ganeti import qlang
from ganeti import query
from ganeti import utils
32
33
from ganeti.cmdlib.base import LogicalUnit, NoHooksLU, QueryBase
from ganeti.cmdlib.common import ShareAll, CheckNodeGroupInstances
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171


def _BuildNetworkHookEnv(name, subnet, gateway, network6, gateway6,
                         mac_prefix, tags):
  """Builds network related env variables for hooks

  This builds the hook environment from individual variables.

  @type name: string
  @param name: the name of the network
  @type subnet: string
  @param subnet: the ipv4 subnet
  @type gateway: string
  @param gateway: the ipv4 gateway
  @type network6: string
  @param network6: the ipv6 subnet
  @type gateway6: string
  @param gateway6: the ipv6 gateway
  @type mac_prefix: string
  @param mac_prefix: the mac_prefix
  @type tags: list
  @param tags: the tags of the network

  """
  env = {}
  if name:
    env["NETWORK_NAME"] = name
  if subnet:
    env["NETWORK_SUBNET"] = subnet
  if gateway:
    env["NETWORK_GATEWAY"] = gateway
  if network6:
    env["NETWORK_SUBNET6"] = network6
  if gateway6:
    env["NETWORK_GATEWAY6"] = gateway6
  if mac_prefix:
    env["NETWORK_MAC_PREFIX"] = mac_prefix
  if tags:
    env["NETWORK_TAGS"] = " ".join(tags)

  return env


class LUNetworkAdd(LogicalUnit):
  """Logical unit for creating networks.

  """
  HPATH = "network-add"
  HTYPE = constants.HTYPE_NETWORK
  REQ_BGL = False

  def BuildHooksNodes(self):
    """Build hooks nodes.

    """
    mn = self.cfg.GetMasterNode()
    return ([mn], [mn])

  def CheckArguments(self):
    if self.op.mac_prefix:
      self.op.mac_prefix = \
        utils.NormalizeAndValidateThreeOctetMacPrefix(self.op.mac_prefix)

  def ExpandNames(self):
    self.network_uuid = self.cfg.GenerateUniqueID(self.proc.GetECId())

    if self.op.conflicts_check:
      self.share_locks[locking.LEVEL_NODE] = 1
      self.share_locks[locking.LEVEL_NODE_ALLOC] = 1
      self.needed_locks = {
        locking.LEVEL_NODE: locking.ALL_SET,
        locking.LEVEL_NODE_ALLOC: locking.ALL_SET,
        }
    else:
      self.needed_locks = {}

    self.add_locks[locking.LEVEL_NETWORK] = self.network_uuid

  def CheckPrereq(self):
    if self.op.network is None:
      raise errors.OpPrereqError("Network must be given",
                                 errors.ECODE_INVAL)

    try:
      existing_uuid = self.cfg.LookupNetwork(self.op.network_name)
    except errors.OpPrereqError:
      pass
    else:
      raise errors.OpPrereqError("Desired network name '%s' already exists as a"
                                 " network (UUID: %s)" %
                                 (self.op.network_name, existing_uuid),
                                 errors.ECODE_EXISTS)

    # Check tag validity
    for tag in self.op.tags:
      objects.TaggableObject.ValidateTag(tag)

  def BuildHooksEnv(self):
    """Build hooks env.

    """
    args = {
      "name": self.op.network_name,
      "subnet": self.op.network,
      "gateway": self.op.gateway,
      "network6": self.op.network6,
      "gateway6": self.op.gateway6,
      "mac_prefix": self.op.mac_prefix,
      "tags": self.op.tags,
      }
    return _BuildNetworkHookEnv(**args) # pylint: disable=W0142

  def Exec(self, feedback_fn):
    """Add the ip pool to the cluster.

    """
    nobj = objects.Network(name=self.op.network_name,
                           network=self.op.network,
                           gateway=self.op.gateway,
                           network6=self.op.network6,
                           gateway6=self.op.gateway6,
                           mac_prefix=self.op.mac_prefix,
                           uuid=self.network_uuid)
    # Initialize the associated address pool
    try:
      pool = network.AddressPool.InitializeNetwork(nobj)
    except errors.AddressPoolError, err:
      raise errors.OpExecError("Cannot create IP address pool for network"
                               " '%s': %s" % (self.op.network_name, err))

    # Check if we need to reserve the nodes and the cluster master IP
    # These may not be allocated to any instances in routed mode, as
    # they wouldn't function anyway.
    if self.op.conflicts_check:
      for node in self.cfg.GetAllNodesInfo().values():
        for ip in [node.primary_ip, node.secondary_ip]:
          try:
            if pool.Contains(ip):
172
              pool.Reserve(ip, external=True)
173
174
175
176
177
178
179
180
181
              self.LogInfo("Reserved IP address of node '%s' (%s)",
                           node.name, ip)
          except errors.AddressPoolError, err:
            self.LogWarning("Cannot reserve IP address '%s' of node '%s': %s",
                            ip, node.name, err)

      master_ip = self.cfg.GetClusterInfo().master_ip
      try:
        if pool.Contains(master_ip):
182
          pool.Reserve(master_ip, external=True)
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
          self.LogInfo("Reserved cluster master IP address (%s)", master_ip)
      except errors.AddressPoolError, err:
        self.LogWarning("Cannot reserve cluster master IP address (%s): %s",
                        master_ip, err)

    if self.op.add_reserved_ips:
      for ip in self.op.add_reserved_ips:
        try:
          pool.Reserve(ip, external=True)
        except errors.AddressPoolError, err:
          raise errors.OpExecError("Cannot reserve IP address '%s': %s" %
                                   (ip, err))

    if self.op.tags:
      for tag in self.op.tags:
        nobj.AddTag(tag)

    self.cfg.AddNetwork(nobj, self.proc.GetECId(), check_uuid=False)
    del self.remove_locks[locking.LEVEL_NETWORK]


class LUNetworkRemove(LogicalUnit):
  HPATH = "network-remove"
  HTYPE = constants.HTYPE_NETWORK
  REQ_BGL = False

  def ExpandNames(self):
    self.network_uuid = self.cfg.LookupNetwork(self.op.network_name)

    self.share_locks[locking.LEVEL_NODEGROUP] = 1
    self.needed_locks = {
      locking.LEVEL_NETWORK: [self.network_uuid],
      locking.LEVEL_NODEGROUP: locking.ALL_SET,
      }

  def CheckPrereq(self):
    """Check prerequisites.

    This checks that the given network name exists as a network, that is
    empty (i.e., contains no nodes), and that is not the last group of the
    cluster.

    """
    # Verify that the network is not conncted.
    node_groups = [group.name
                   for group in self.cfg.GetAllNodeGroupsInfo().values()
                   if self.network_uuid in group.networks]

    if node_groups:
      self.LogWarning("Network '%s' is connected to the following"
                      " node groups: %s" %
                      (self.op.network_name,
                       utils.CommaJoin(utils.NiceSort(node_groups))))
      raise errors.OpPrereqError("Network still connected", errors.ECODE_STATE)

  def BuildHooksEnv(self):
    """Build hooks env.

    """
    return {
      "NETWORK_NAME": self.op.network_name,
      }

  def BuildHooksNodes(self):
    """Build hooks nodes.

    """
    mn = self.cfg.GetMasterNode()
    return ([mn], [mn])

  def Exec(self, feedback_fn):
    """Remove the network.

    """
    try:
      self.cfg.RemoveNetwork(self.network_uuid)
    except errors.ConfigurationError:
      raise errors.OpExecError("Network '%s' with UUID %s disappeared" %
                               (self.op.network_name, self.network_uuid))


class LUNetworkSetParams(LogicalUnit):
  """Modifies the parameters of a network.

  """
  HPATH = "network-modify"
  HTYPE = constants.HTYPE_NETWORK
  REQ_BGL = False

  def CheckArguments(self):
    if (self.op.gateway and
        (self.op.add_reserved_ips or self.op.remove_reserved_ips)):
      raise errors.OpPrereqError("Cannot modify gateway and reserved ips"
                                 " at once", errors.ECODE_INVAL)

  def ExpandNames(self):
    self.network_uuid = self.cfg.LookupNetwork(self.op.network_name)

    self.needed_locks = {
      locking.LEVEL_NETWORK: [self.network_uuid],
      }

  def CheckPrereq(self):
    """Check prerequisites.

    """
    self.network = self.cfg.GetNetwork(self.network_uuid)
    self.gateway = self.network.gateway
    self.mac_prefix = self.network.mac_prefix
    self.network6 = self.network.network6
    self.gateway6 = self.network.gateway6
    self.tags = self.network.tags

    self.pool = network.AddressPool(self.network)

    if self.op.gateway:
      if self.op.gateway == constants.VALUE_NONE:
        self.gateway = None
      else:
        self.gateway = self.op.gateway
        if self.pool.IsReserved(self.gateway):
          raise errors.OpPrereqError("Gateway IP address '%s' is already"
                                     " reserved" % self.gateway,
                                     errors.ECODE_STATE)

    if self.op.mac_prefix:
      if self.op.mac_prefix == constants.VALUE_NONE:
        self.mac_prefix = None
      else:
        self.mac_prefix = \
          utils.NormalizeAndValidateThreeOctetMacPrefix(self.op.mac_prefix)

    if self.op.gateway6:
      if self.op.gateway6 == constants.VALUE_NONE:
        self.gateway6 = None
      else:
        self.gateway6 = self.op.gateway6

    if self.op.network6:
      if self.op.network6 == constants.VALUE_NONE:
        self.network6 = None
      else:
        self.network6 = self.op.network6

  def BuildHooksEnv(self):
    """Build hooks env.

    """
    args = {
      "name": self.op.network_name,
      "subnet": self.network.network,
      "gateway": self.gateway,
      "network6": self.network6,
      "gateway6": self.gateway6,
      "mac_prefix": self.mac_prefix,
      "tags": self.tags,
      }
    return _BuildNetworkHookEnv(**args) # pylint: disable=W0142

  def BuildHooksNodes(self):
    """Build hooks nodes.

    """
    mn = self.cfg.GetMasterNode()
    return ([mn], [mn])

  def Exec(self, feedback_fn):
    """Modifies the network.

    """
    #TODO: reserve/release via temporary reservation manager
    #      extend cfg.ReserveIp/ReleaseIp with the external flag
    if self.op.gateway:
      if self.gateway == self.network.gateway:
        self.LogWarning("Gateway is already %s", self.gateway)
      else:
        if self.gateway:
          self.pool.Reserve(self.gateway, external=True)
        if self.network.gateway:
          self.pool.Release(self.network.gateway, external=True)
        self.network.gateway = self.gateway

    if self.op.add_reserved_ips:
      for ip in self.op.add_reserved_ips:
        try:
368
          self.pool.Reserve(ip, external=True)
369
370
371
372
373
374
375
376
377
        except errors.AddressPoolError, err:
          self.LogWarning("Cannot reserve IP address %s: %s", ip, err)

    if self.op.remove_reserved_ips:
      for ip in self.op.remove_reserved_ips:
        if ip == self.network.gateway:
          self.LogWarning("Cannot unreserve Gateway's IP")
          continue
        try:
378
          self.pool.Release(ip, external=True)
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
        except errors.AddressPoolError, err:
          self.LogWarning("Cannot release IP address %s: %s", ip, err)

    if self.op.mac_prefix:
      self.network.mac_prefix = self.mac_prefix

    if self.op.network6:
      self.network.network6 = self.network6

    if self.op.gateway6:
      self.network.gateway6 = self.gateway6

    self.pool.Validate()

    self.cfg.Update(self.network, feedback_fn)


396
class NetworkQuery(QueryBase):
397
398
399
400
  FIELDS = query.NETWORK_FIELDS

  def ExpandNames(self, lu):
    lu.needed_locks = {}
401
    lu.share_locks = ShareAll()
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467

    self.do_locking = self.use_locking

    all_networks = lu.cfg.GetAllNetworksInfo()
    name_to_uuid = dict((n.name, n.uuid) for n in all_networks.values())

    if self.names:
      missing = []
      self.wanted = []

      for name in self.names:
        if name in name_to_uuid:
          self.wanted.append(name_to_uuid[name])
        else:
          missing.append(name)

      if missing:
        raise errors.OpPrereqError("Some networks do not exist: %s" % missing,
                                   errors.ECODE_NOENT)
    else:
      self.wanted = locking.ALL_SET

    if self.do_locking:
      lu.needed_locks[locking.LEVEL_NETWORK] = self.wanted
      if query.NETQ_INST in self.requested_data:
        lu.needed_locks[locking.LEVEL_INSTANCE] = locking.ALL_SET
      if query.NETQ_GROUP in self.requested_data:
        lu.needed_locks[locking.LEVEL_NODEGROUP] = locking.ALL_SET

  def DeclareLocks(self, lu, level):
    pass

  def _GetQueryData(self, lu):
    """Computes the list of networks and their attributes.

    """
    all_networks = lu.cfg.GetAllNetworksInfo()

    network_uuids = self._GetNames(lu, all_networks.keys(),
                                   locking.LEVEL_NETWORK)

    do_instances = query.NETQ_INST in self.requested_data
    do_groups = query.NETQ_GROUP in self.requested_data

    network_to_instances = None
    network_to_groups = None

    # For NETQ_GROUP, we need to map network->[groups]
    if do_groups:
      all_groups = lu.cfg.GetAllNodeGroupsInfo()
      network_to_groups = dict((uuid, []) for uuid in network_uuids)
      for _, group in all_groups.iteritems():
        for net_uuid in network_uuids:
          netparams = group.networks.get(net_uuid, None)
          if netparams:
            info = (group.name, netparams[constants.NIC_MODE],
                    netparams[constants.NIC_LINK])

            network_to_groups[net_uuid].append(info)

    if do_instances:
      all_instances = lu.cfg.GetAllInstancesInfo()
      network_to_instances = dict((uuid, []) for uuid in network_uuids)
      for instance in all_instances.values():
        for nic in instance.nics:
          if nic.network in network_uuids:
468
            network_to_instances[nic.network].append(instance.name)
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
            break

    if query.NETQ_STATS in self.requested_data:
      stats = \
        dict((uuid,
              self._GetStats(network.AddressPool(all_networks[uuid])))
             for uuid in network_uuids)
    else:
      stats = None

    return query.NetworkQueryData([all_networks[uuid]
                                   for uuid in network_uuids],
                                   network_to_groups,
                                   network_to_instances,
                                   stats)

  @staticmethod
  def _GetStats(pool):
    """Returns statistics for a network address pool.

    """
    return {
      "free_count": pool.GetFreeCount(),
      "reserved_count": pool.GetReservedCount(),
      "map": pool.GetMap(),
      "external_reservations":
        utils.CommaJoin(pool.GetExternalReservations()),
      }


class LUNetworkQuery(NoHooksLU):
  """Logical unit for querying networks.

  """
  REQ_BGL = False

  def CheckArguments(self):
506
    self.nq = NetworkQuery(qlang.MakeSimpleFilter("name", self.op.names),
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
                            self.op.output_fields, self.op.use_locking)

  def ExpandNames(self):
    self.nq.ExpandNames(self)

  def Exec(self, feedback_fn):
    return self.nq.OldStyleQuery(self)


def _FmtNetworkConflict(details):
  """Utility for L{_NetworkConflictCheck}.

  """
  return utils.CommaJoin("nic%s/%s" % (idx, ipaddr)
                         for (idx, ipaddr) in details)


def _NetworkConflictCheck(lu, check_fn, action, instances):
  """Checks for network interface conflicts with a network.

  @type lu: L{LogicalUnit}
  @type check_fn: callable receiving one parameter (L{objects.NIC}) and
    returning boolean
  @param check_fn: Function checking for conflict
  @type action: string
  @param action: Part of error message (see code)
533
534
  @param instances: the instances to check
  @type instances: list of instance objects
535
536
537
538
539
  @raise errors.OpPrereqError: If conflicting IP addresses are found.

  """
  conflicts = []

540
  for instance in instances:
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
    instconflicts = [(idx, nic.ip)
                     for (idx, nic) in enumerate(instance.nics)
                     if check_fn(nic)]

    if instconflicts:
      conflicts.append((instance.name, instconflicts))

  if conflicts:
    lu.LogWarning("IP addresses from network '%s', which is about to %s"
                  " node group '%s', are in use: %s" %
                  (lu.network_name, action, lu.group.name,
                   utils.CommaJoin(("%s: %s" %
                                    (name, _FmtNetworkConflict(details)))
                                   for (name, details) in conflicts)))

    raise errors.OpPrereqError("Conflicting IP addresses found; "
                               " remove/modify the corresponding network"
                               " interfaces", errors.ECODE_STATE)


class LUNetworkConnect(LogicalUnit):
  """Connect a network to a nodegroup

  """
  HPATH = "network-connect"
  HTYPE = constants.HTYPE_NETWORK
  REQ_BGL = False

  def ExpandNames(self):
    self.network_name = self.op.network_name
    self.group_name = self.op.group_name
    self.network_mode = self.op.network_mode
    self.network_link = self.op.network_link
574
    self.network_vlan = ""
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596

    self.network_uuid = self.cfg.LookupNetwork(self.network_name)
    self.group_uuid = self.cfg.LookupNodeGroup(self.group_name)

    self.needed_locks = {
      locking.LEVEL_INSTANCE: [],
      locking.LEVEL_NODEGROUP: [self.group_uuid],
      }
    self.share_locks[locking.LEVEL_INSTANCE] = 1

    if self.op.conflicts_check:
      self.needed_locks[locking.LEVEL_NETWORK] = [self.network_uuid]
      self.share_locks[locking.LEVEL_NETWORK] = 1

  def DeclareLocks(self, level):
    if level == locking.LEVEL_INSTANCE:
      assert not self.needed_locks[locking.LEVEL_INSTANCE]

      # Lock instances optimistically, needs verification once group lock has
      # been acquired
      if self.op.conflicts_check:
        self.needed_locks[locking.LEVEL_INSTANCE] = \
597
598
          self.cfg.GetInstanceNames(
            self.cfg.GetNodeGroupInstances(self.group_uuid))
599
600
601
602
603
604
605
606
607
608

  def BuildHooksEnv(self):
    ret = {
      "GROUP_NAME": self.group_name,
      "GROUP_NETWORK_MODE": self.network_mode,
      "GROUP_NETWORK_LINK": self.network_link,
      }
    return ret

  def BuildHooksNodes(self):
Thomas Thrainer's avatar
Thomas Thrainer committed
609
610
    node_uuids = self.cfg.GetNodeGroup(self.group_uuid).members
    return (node_uuids, node_uuids)
611
612
613
614
615
616
617

  def CheckPrereq(self):
    owned_groups = frozenset(self.owned_locks(locking.LEVEL_NODEGROUP))

    assert self.group_uuid in owned_groups

    # Check if locked instances are still correct
618
    owned_instance_names = frozenset(self.owned_locks(locking.LEVEL_INSTANCE))
619
    if self.op.conflicts_check:
620
      CheckNodeGroupInstances(self.cfg, self.group_uuid, owned_instance_names)
621
622
623
624

    self.netparams = {
      constants.NIC_MODE: self.network_mode,
      constants.NIC_LINK: self.network_link,
625
      constants.NIC_VLAN: self.network_vlan,
626
      }
627

628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
    objects.NIC.CheckParameterSyntax(self.netparams)

    self.group = self.cfg.GetNodeGroup(self.group_uuid)
    #if self.network_mode == constants.NIC_MODE_BRIDGED:
    #  _CheckNodeGroupBridgesExist(self, self.network_link, self.group_uuid)
    self.connected = False
    if self.network_uuid in self.group.networks:
      self.LogWarning("Network '%s' is already mapped to group '%s'" %
                      (self.network_name, self.group.name))
      self.connected = True

    # check only if not already connected
    elif self.op.conflicts_check:
      pool = network.AddressPool(self.cfg.GetNetwork(self.network_uuid))

643
644
      _NetworkConflictCheck(
        self, lambda nic: pool.Contains(nic.ip), "connect to",
645
646
        [instance_info for (_, instance_info) in
         self.cfg.GetMultiInstanceInfoByName(owned_instance_names)])
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682

  def Exec(self, feedback_fn):
    # Connect the network and update the group only if not already connected
    if not self.connected:
      self.group.networks[self.network_uuid] = self.netparams
      self.cfg.Update(self.group, feedback_fn)


class LUNetworkDisconnect(LogicalUnit):
  """Disconnect a network to a nodegroup

  """
  HPATH = "network-disconnect"
  HTYPE = constants.HTYPE_NETWORK
  REQ_BGL = False

  def ExpandNames(self):
    self.network_name = self.op.network_name
    self.group_name = self.op.group_name

    self.network_uuid = self.cfg.LookupNetwork(self.network_name)
    self.group_uuid = self.cfg.LookupNodeGroup(self.group_name)

    self.needed_locks = {
      locking.LEVEL_INSTANCE: [],
      locking.LEVEL_NODEGROUP: [self.group_uuid],
      }
    self.share_locks[locking.LEVEL_INSTANCE] = 1

  def DeclareLocks(self, level):
    if level == locking.LEVEL_INSTANCE:
      assert not self.needed_locks[locking.LEVEL_INSTANCE]

      # Lock instances optimistically, needs verification once group lock has
      # been acquired
      self.needed_locks[locking.LEVEL_INSTANCE] = \
683
684
        self.cfg.GetInstanceNames(
          self.cfg.GetNodeGroupInstances(self.group_uuid))
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702

  def BuildHooksEnv(self):
    ret = {
      "GROUP_NAME": self.group_name,
      }
    return ret

  def BuildHooksNodes(self):
    nodes = self.cfg.GetNodeGroup(self.group_uuid).members
    return (nodes, nodes)

  def CheckPrereq(self):
    owned_groups = frozenset(self.owned_locks(locking.LEVEL_NODEGROUP))

    assert self.group_uuid in owned_groups

    # Check if locked instances are still correct
    owned_instances = frozenset(self.owned_locks(locking.LEVEL_INSTANCE))
703
    CheckNodeGroupInstances(self.cfg, self.group_uuid, owned_instances)
704
705
706
707
708
709
710
711
712
713

    self.group = self.cfg.GetNodeGroup(self.group_uuid)
    self.connected = True
    if self.network_uuid not in self.group.networks:
      self.LogWarning("Network '%s' is not mapped to group '%s'",
                      self.network_name, self.group.name)
      self.connected = False

    # We need this check only if network is not already connected
    else:
714
715
      _NetworkConflictCheck(
        self, lambda nic: nic.network == self.network_uuid, "disconnect from",
716
        [instance_info for (_, instance_info) in
717
         self.cfg.GetMultiInstanceInfoByName(owned_instances)])
718
719
720
721
722
723

  def Exec(self, feedback_fn):
    # Disconnect the network and update the group only if network is connected
    if self.connected:
      del self.group.networks[self.network_uuid]
      self.cfg.Update(self.group, feedback_fn)