cmdlib.py 508 KB
Newer Older
Iustin Pop's avatar
Iustin Pop committed
1
#
Iustin Pop's avatar
Iustin Pop committed
2
3
#

4
# Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Google Inc.
Iustin Pop's avatar
Iustin Pop committed
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
#
# 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.


22
"""Module implementing the master-side code."""
Iustin Pop's avatar
Iustin Pop committed
23

24
# pylint: disable=W0201,C0302
25
26
27

# W0201 since most LU attributes are defined in CheckPrereq or similar
# functions
Iustin Pop's avatar
Iustin Pop committed
28

29
# C0302: since we have waaaay too many lines in this module
Iustin Pop's avatar
Iustin Pop committed
30

Iustin Pop's avatar
Iustin Pop committed
31
32
33
34
35
import os
import os.path
import time
import re
import platform
36
import logging
37
import copy
38
import OpenSSL
39
40
41
import socket
import tempfile
import shutil
42
import itertools
43
import operator
Iustin Pop's avatar
Iustin Pop committed
44
45
46
47
48

from ganeti import ssh
from ganeti import utils
from ganeti import errors
from ganeti import hypervisor
Guido Trotter's avatar
Guido Trotter committed
49
from ganeti import locking
Iustin Pop's avatar
Iustin Pop committed
50
51
from ganeti import constants
from ganeti import objects
52
from ganeti import serializer
53
from ganeti import ssconf
54
from ganeti import uidpool
55
from ganeti import compat
56
from ganeti import masterd
57
from ganeti import netutils
58
59
from ganeti import query
from ganeti import qlang
60
from ganeti import opcodes
61
from ganeti import ht
62
from ganeti import rpc
63

64
import ganeti.masterd.instance # pylint: disable=W0611
65

Iustin Pop's avatar
Iustin Pop committed
66

67
68
69
#: Size of DRBD meta block device
DRBD_META_SIZE = 128

70
71
72
73
74
75
76
# States of instance
INSTANCE_UP = [constants.ADMINST_UP]
INSTANCE_DOWN = [constants.ADMINST_DOWN]
INSTANCE_OFFLINE = [constants.ADMINST_OFFLINE]
INSTANCE_ONLINE = [constants.ADMINST_DOWN, constants.ADMINST_UP]
INSTANCE_NOT_RUNNING = [constants.ADMINST_DOWN, constants.ADMINST_OFFLINE]

77

78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
class ResultWithJobs:
  """Data container for LU results with jobs.

  Instances of this class returned from L{LogicalUnit.Exec} will be recognized
  by L{mcpu.Processor._ProcessResult}. The latter will then submit the jobs
  contained in the C{jobs} attribute and include the job IDs in the opcode
  result.

  """
  def __init__(self, jobs, **kwargs):
    """Initializes this class.

    Additional return values can be specified as keyword arguments.

    @type jobs: list of lists of L{opcode.OpCode}
    @param jobs: A list of lists of opcode objects

    """
    self.jobs = jobs
    self.other = kwargs


Iustin Pop's avatar
Iustin Pop committed
100
class LogicalUnit(object):
101
  """Logical Unit base class.
Iustin Pop's avatar
Iustin Pop committed
102
103

  Subclasses must follow these rules:
104
    - implement ExpandNames
105
106
    - implement CheckPrereq (except when tasklets are used)
    - implement Exec (except when tasklets are used)
Iustin Pop's avatar
Iustin Pop committed
107
    - implement BuildHooksEnv
108
    - implement BuildHooksNodes
Iustin Pop's avatar
Iustin Pop committed
109
    - redefine HPATH and HTYPE
110
    - optionally redefine their run requirements:
111
        REQ_BGL: the LU needs to hold the Big Ganeti Lock exclusively
112
113

  Note that all commands require root permissions.
Iustin Pop's avatar
Iustin Pop committed
114

115
116
117
  @ivar dry_run_result: the value (if any) that will be returned to the caller
      in dry-run mode (signalled by opcode dry_run parameter)

Iustin Pop's avatar
Iustin Pop committed
118
119
120
  """
  HPATH = None
  HTYPE = None
121
  REQ_BGL = True
Iustin Pop's avatar
Iustin Pop committed
122

123
  def __init__(self, processor, op, context, rpc_runner):
Iustin Pop's avatar
Iustin Pop committed
124
125
    """Constructor for LogicalUnit.

Michael Hanselmann's avatar
Michael Hanselmann committed
126
    This needs to be overridden in derived classes in order to check op
Iustin Pop's avatar
Iustin Pop committed
127
128
129
    validity.

    """
Iustin Pop's avatar
Iustin Pop committed
130
    self.proc = processor
Iustin Pop's avatar
Iustin Pop committed
131
    self.op = op
Guido Trotter's avatar
Guido Trotter committed
132
    self.cfg = context.cfg
133
    self.glm = context.glm
Iustin Pop's avatar
Iustin Pop committed
134
135
    # readability alias
    self.owned_locks = context.glm.list_owned
Guido Trotter's avatar
Guido Trotter committed
136
    self.context = context
137
    self.rpc = rpc_runner
138
    # Dicts used to declare locking needs to mcpu
139
    self.needed_locks = None
140
    self.share_locks = dict.fromkeys(locking.LEVELS, 0)
141
142
    self.add_locks = {}
    self.remove_locks = {}
143
144
    # Used to force good behavior when calling helper functions
    self.recalculate_locks = {}
145
    # logging
146
147
148
149
    self.Log = processor.Log # pylint: disable=C0103
    self.LogWarning = processor.LogWarning # pylint: disable=C0103
    self.LogInfo = processor.LogInfo # pylint: disable=C0103
    self.LogStep = processor.LogStep # pylint: disable=C0103
150
151
    # support for dry-run
    self.dry_run_result = None
152
153
154
155
    # support for generic debug attribute
    if (not hasattr(self.op, "debug_level") or
        not isinstance(self.op.debug_level, int)):
      self.op.debug_level = 0
156

157
    # Tasklets
158
    self.tasklets = None
159

160
161
    # Validate opcode parameters and set defaults
    self.op.Validate(True)
162

163
    self.CheckArguments()
Iustin Pop's avatar
Iustin Pop committed
164

165
166
167
168
169
170
171
172
173
  def CheckArguments(self):
    """Check syntactic validity for the opcode arguments.

    This method is for doing a simple syntactic check and ensure
    validity of opcode parameters, without any cluster-related
    checks. While the same can be accomplished in ExpandNames and/or
    CheckPrereq, doing these separate is better because:

      - ExpandNames is left as as purely a lock-related function
Michael Hanselmann's avatar
Michael Hanselmann committed
174
      - CheckPrereq is run after we have acquired locks (and possible
175
176
177
178
179
180
181
182
        waited for them)

    The function is allowed to change the self.op attribute so that
    later methods can no longer worry about missing parameters.

    """
    pass

183
184
185
186
187
188
  def ExpandNames(self):
    """Expand names for this LU.

    This method is called before starting to execute the opcode, and it should
    update all the parameters of the opcode to their canonical form (e.g. a
    short node name must be fully expanded after this method has successfully
Adeodato Simo's avatar
Adeodato Simo committed
189
    completed). This way locking, hooks, logging, etc. can work correctly.
190
191
192
193

    LUs which implement this method must also populate the self.needed_locks
    member, as a dict with lock levels as keys, and a list of needed lock names
    as values. Rules:
194
195
196
197
198

      - use an empty dict if you don't need any lock
      - if you don't need any lock at a particular level omit that level
      - don't put anything for the BGL level
      - if you want all locks at a level use locking.ALL_SET as a value
199

Guido Trotter's avatar
Guido Trotter committed
200
201
202
203
    If you need to share locks (rather than acquire them exclusively) at one
    level you can modify self.share_locks, setting a true value (usually 1) for
    that level. By default locks are not shared.

204
205
206
207
    This function can also define a list of tasklets, which then will be
    executed in order instead of the usual LU-level CheckPrereq and Exec
    functions, if those are not defined by the LU.

208
209
210
211
212
    Examples::

      # Acquire all nodes and one instance
      self.needed_locks = {
        locking.LEVEL_NODE: locking.ALL_SET,
213
        locking.LEVEL_INSTANCE: ['instance1.example.com'],
214
215
216
      }
      # Acquire just two nodes
      self.needed_locks = {
217
        locking.LEVEL_NODE: ['node1.example.com', 'node2.example.com'],
218
219
220
      }
      # Acquire no locks
      self.needed_locks = {} # No, you can't leave it to the default value None
221
222
223
224
225
226
227
228
229
230

    """
    # The implementation of this method is mandatory only if the new LU is
    # concurrent, so that old LUs don't need to be changed all at the same
    # time.
    if self.REQ_BGL:
      self.needed_locks = {} # Exclusive LUs don't need locks.
    else:
      raise NotImplementedError

Guido Trotter's avatar
Guido Trotter committed
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
  def DeclareLocks(self, level):
    """Declare LU locking needs for a level

    While most LUs can just declare their locking needs at ExpandNames time,
    sometimes there's the need to calculate some locks after having acquired
    the ones before. This function is called just before acquiring locks at a
    particular level, but after acquiring the ones at lower levels, and permits
    such calculations. It can be used to modify self.needed_locks, and by
    default it does nothing.

    This function is only called if you have something already set in
    self.needed_locks for the level.

    @param level: Locking level which is going to be locked
    @type level: member of ganeti.locking.LEVELS

    """

Iustin Pop's avatar
Iustin Pop committed
249
250
251
252
253
254
255
256
257
258
259
260
  def CheckPrereq(self):
    """Check prerequisites for this LU.

    This method should check that the prerequisites for the execution
    of this LU are fulfilled. It can do internode communication, but
    it should be idempotent - no cluster or system changes are
    allowed.

    The method should raise errors.OpPrereqError in case something is
    not fulfilled. Its return value is ignored.

    This method should also update all the parameters of the opcode to
261
    their canonical form if it hasn't been done by ExpandNames before.
Iustin Pop's avatar
Iustin Pop committed
262
263

    """
264
    if self.tasklets is not None:
265
      for (idx, tl) in enumerate(self.tasklets):
266
267
        logging.debug("Checking prerequisites for tasklet %s/%s",
                      idx + 1, len(self.tasklets))
268
269
        tl.CheckPrereq()
    else:
270
      pass
Iustin Pop's avatar
Iustin Pop committed
271
272
273
274
275
276
277
278
279

  def Exec(self, feedback_fn):
    """Execute the LU.

    This method should implement the actual work. It should raise
    errors.OpExecError for failures that are somewhat dealt with in
    code, or expected.

    """
280
    if self.tasklets is not None:
281
      for (idx, tl) in enumerate(self.tasklets):
282
        logging.debug("Executing tasklet %s/%s", idx + 1, len(self.tasklets))
283
284
285
        tl.Exec(feedback_fn)
    else:
      raise NotImplementedError
Iustin Pop's avatar
Iustin Pop committed
286
287
288
289

  def BuildHooksEnv(self):
    """Build hooks environment for this LU.

290
291
292
293
294
295
296
297
    @rtype: dict
    @return: Dictionary containing the environment that will be used for
      running the hooks for this LU. The keys of the dict must not be prefixed
      with "GANETI_"--that'll be added by the hooks runner. The hooks runner
      will extend the environment with additional variables. If no environment
      should be defined, an empty dictionary should be returned (not C{None}).
    @note: If the C{HPATH} attribute of the LU class is C{None}, this function
      will not be called.
Iustin Pop's avatar
Iustin Pop committed
298

299
300
    """
    raise NotImplementedError
Iustin Pop's avatar
Iustin Pop committed
301

302
303
  def BuildHooksNodes(self):
    """Build list of nodes to run LU's hooks.
Iustin Pop's avatar
Iustin Pop committed
304

305
306
307
308
309
310
311
    @rtype: tuple; (list, list)
    @return: Tuple containing a list of node names on which the hook
      should run before the execution and a list of node names on which the
      hook should run after the execution. No nodes should be returned as an
      empty list (and not None).
    @note: If the C{HPATH} attribute of the LU class is C{None}, this function
      will not be called.
Iustin Pop's avatar
Iustin Pop committed
312
313
314
315

    """
    raise NotImplementedError

316
317
318
319
320
321
322
323
324
  def HooksCallBack(self, phase, hook_results, feedback_fn, lu_result):
    """Notify the LU about the results of its hooks.

    This method is called every time a hooks phase is executed, and notifies
    the Logical Unit about the hooks' result. The LU can then use it to alter
    its result based on the hooks.  By default the method does nothing and the
    previous result is passed back unchanged but any LU can define it if it
    wants to use the local cluster hook-scripts somehow.

325
326
327
328
329
330
331
332
    @param phase: one of L{constants.HOOKS_PHASE_POST} or
        L{constants.HOOKS_PHASE_PRE}; it denotes the hooks phase
    @param hook_results: the results of the multi-node hooks rpc call
    @param feedback_fn: function used send feedback back to the caller
    @param lu_result: the previous Exec result this LU had, or None
        in the PRE phase
    @return: the new Exec result, based on the previous result
        and hook results
333
334

    """
335
336
    # API must be kept, thus we ignore the unused argument and could
    # be a function warnings
337
    # pylint: disable=W0613,R0201
338
339
    return lu_result

340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
  def _ExpandAndLockInstance(self):
    """Helper function to expand and lock an instance.

    Many LUs that work on an instance take its name in self.op.instance_name
    and need to expand it and then declare the expanded name for locking. This
    function does it, and then updates self.op.instance_name to the expanded
    name. It also initializes needed_locks as a dict, if this hasn't been done
    before.

    """
    if self.needed_locks is None:
      self.needed_locks = {}
    else:
      assert locking.LEVEL_INSTANCE not in self.needed_locks, \
        "_ExpandAndLockInstance called with instance-level locks set"
355
356
357
    self.op.instance_name = _ExpandInstanceName(self.cfg,
                                                self.op.instance_name)
    self.needed_locks[locking.LEVEL_INSTANCE] = self.op.instance_name
358

359
360
  def _LockInstancesNodes(self, primary_only=False,
                          level=locking.LEVEL_NODE):
361
362
363
364
365
366
367
368
369
370
371
372
373
    """Helper function to declare instances' nodes for locking.

    This function should be called after locking one or more instances to lock
    their nodes. Its effect is populating self.needed_locks[locking.LEVEL_NODE]
    with all primary or secondary nodes for instances already locked and
    present in self.needed_locks[locking.LEVEL_INSTANCE].

    It should be called from DeclareLocks, and for safety only works if
    self.recalculate_locks[locking.LEVEL_NODE] is set.

    In the future it may grow parameters to just lock some instance's nodes, or
    to just lock primaries or secondary nodes, if needed.

374
    If should be called in DeclareLocks in a way similar to::
375

376
377
      if level == locking.LEVEL_NODE:
        self._LockInstancesNodes()
378

379
380
    @type primary_only: boolean
    @param primary_only: only lock primary nodes of locked instances
381
    @param level: Which lock level to use for locking nodes
382

383
    """
384
    assert level in self.recalculate_locks, \
385
386
387
388
389
390
391
392
      "_LockInstancesNodes helper function called with no nodes to recalculate"

    # TODO: check if we're really been called with the instance locks held

    # For now we'll replace self.needed_locks[locking.LEVEL_NODE], but in the
    # future we might want to have different behaviors depending on the value
    # of self.recalculate_locks[locking.LEVEL_NODE]
    wanted_nodes = []
Iustin Pop's avatar
Iustin Pop committed
393
    locked_i = self.owned_locks(locking.LEVEL_INSTANCE)
394
    for _, instance in self.cfg.GetMultiInstanceInfo(locked_i):
395
      wanted_nodes.append(instance.primary_node)
396
397
      if not primary_only:
        wanted_nodes.extend(instance.secondary_nodes)
398

399
400
401
402
403
404
    if self.recalculate_locks[level] == constants.LOCKS_REPLACE:
      self.needed_locks[level] = wanted_nodes
    elif self.recalculate_locks[level] == constants.LOCKS_APPEND:
      self.needed_locks[level].extend(wanted_nodes)
    else:
      raise errors.ProgrammerError("Unknown recalculation mode")
405

406
    del self.recalculate_locks[level]
407

Iustin Pop's avatar
Iustin Pop committed
408

409
class NoHooksLU(LogicalUnit): # pylint: disable=W0223
Iustin Pop's avatar
Iustin Pop committed
410
411
412
413
414
415
416
417
418
  """Simple LU which runs no hooks.

  This LU is intended as a parent for other LogicalUnits which will
  run no hooks, in order to reduce duplicate code.

  """
  HPATH = None
  HTYPE = None

419
420
421
422
423
424
  def BuildHooksEnv(self):
    """Empty BuildHooksEnv for NoHooksLu.

    This just raises an error.

    """
425
426
427
428
429
430
431
    raise AssertionError("BuildHooksEnv called for NoHooksLUs")

  def BuildHooksNodes(self):
    """Empty BuildHooksNodes for NoHooksLU.

    """
    raise AssertionError("BuildHooksNodes called for NoHooksLU")
432

Iustin Pop's avatar
Iustin Pop committed
433

434
435
436
437
438
439
440
441
442
443
444
445
class Tasklet:
  """Tasklet base class.

  Tasklets are subcomponents for LUs. LUs can consist entirely of tasklets or
  they can mix legacy code with tasklets. Locking needs to be done in the LU,
  tasklets know nothing about locks.

  Subclasses must follow these rules:
    - Implement CheckPrereq
    - Implement Exec

  """
446
447
448
449
450
451
452
  def __init__(self, lu):
    self.lu = lu

    # Shortcuts
    self.cfg = lu.cfg
    self.rpc = lu.rpc

453
454
455
456
457
458
459
460
461
462
463
464
465
466
  def CheckPrereq(self):
    """Check prerequisites for this tasklets.

    This method should check whether the prerequisites for the execution of
    this tasklet are fulfilled. It can do internode communication, but it
    should be idempotent - no cluster or system changes are allowed.

    The method should raise errors.OpPrereqError in case something is not
    fulfilled. Its return value is ignored.

    This method should also update all parameters to their canonical form if it
    hasn't been done before.

    """
467
    pass
468
469
470
471
472
473
474
475
476
477
478
479

  def Exec(self, feedback_fn):
    """Execute the tasklet.

    This method should implement the actual work. It should raise
    errors.OpExecError for failures that are somewhat dealt with in code, or
    expected.

    """
    raise NotImplementedError


480
481
482
483
484
485
486
class _QueryBase:
  """Base for query utility classes.

  """
  #: Attribute holding field definitions
  FIELDS = None

487
  def __init__(self, qfilter, fields, use_locking):
488
489
490
491
492
    """Initializes this class.

    """
    self.use_locking = use_locking

493
    self.query = query.Query(self.FIELDS, fields, qfilter=qfilter,
494
                             namefield="name")
495
    self.requested_data = self.query.RequestedData()
496
    self.names = self.query.RequestedNames()
497

498
499
500
    # Sort only if no names were requested
    self.sort_by_name = not self.names

501
502
503
504
505
506
507
508
    self.do_locking = None
    self.wanted = None

  def _GetNames(self, lu, all_names, lock_level):
    """Helper function to determine names asked for in the query.

    """
    if self.do_locking:
Iustin Pop's avatar
Iustin Pop committed
509
      names = lu.owned_locks(lock_level)
510
511
512
513
514
515
516
517
518
519
    else:
      names = all_names

    if self.wanted == locking.ALL_SET:
      assert not self.names
      # caller didn't specify names, so ordering is not important
      return utils.NiceSort(names)

    # caller specified names and we must keep the same order
    assert self.names
520
    assert not self.do_locking or lu.glm.is_owned(lock_level)
521
522
523
524
525
526
527
528
529

    missing = set(self.wanted).difference(names)
    if missing:
      raise errors.OpExecError("Some items were removed before retrieving"
                               " their data: %s" % missing)

    # Return expanded names
    return self.wanted

530
531
532
533
534
535
536
537
  def ExpandNames(self, lu):
    """Expand names for this query.

    See L{LogicalUnit.ExpandNames}.

    """
    raise NotImplementedError()

538
  def DeclareLocks(self, lu, level):
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
    """Declare locks for this query.

    See L{LogicalUnit.DeclareLocks}.

    """
    raise NotImplementedError()

  def _GetQueryData(self, lu):
    """Collects all data for this query.

    @return: Query data object

    """
    raise NotImplementedError()

  def NewStyleQuery(self, lu):
    """Collect data and execute query.

    """
558
559
    return query.GetQueryResponse(self.query, self._GetQueryData(lu),
                                  sort_by_name=self.sort_by_name)
560
561
562
563
564

  def OldStyleQuery(self, lu):
    """Collect data and execute query.

    """
565
566
    return self.query.OldStyleQuery(self._GetQueryData(lu),
                                    sort_by_name=self.sort_by_name)
567
568


569
570
571
572
573
574
575
def _ShareAll():
  """Returns a dict declaring all lock levels shared.

  """
  return dict.fromkeys(locking.LEVELS, 1)


576
577
578
579
580
581
582
583
584
585
586
587
588
589
def _MakeLegacyNodeInfo(data):
  """Formats the data returned by L{rpc.RpcRunner.call_node_info}.

  Converts the data into a single dictionary. This is fine for most use cases,
  but some require information from more than one volume group or hypervisor.

  """
  (bootid, (vg_info, ), (hv_info, )) = data

  return utils.JoinDisjointDicts(utils.JoinDisjointDicts(vg_info, hv_info), {
    "bootid": bootid,
    })


590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
def _CheckInstanceNodeGroups(cfg, instance_name, owned_groups):
  """Checks if the owned node groups are still correct for an instance.

  @type cfg: L{config.ConfigWriter}
  @param cfg: The cluster configuration
  @type instance_name: string
  @param instance_name: Instance name
  @type owned_groups: set or frozenset
  @param owned_groups: List of currently owned node groups

  """
  inst_groups = cfg.GetInstanceNodeGroups(instance_name)

  if not owned_groups.issuperset(inst_groups):
    raise errors.OpPrereqError("Instance %s's node groups changed since"
                               " locks were acquired, current groups are"
                               " are '%s', owning groups '%s'; retry the"
                               " operation" %
                               (instance_name,
                                utils.CommaJoin(inst_groups),
                                utils.CommaJoin(owned_groups)),
                               errors.ECODE_STATE)

  return inst_groups


616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
def _CheckNodeGroupInstances(cfg, group_uuid, owned_instances):
  """Checks if the instances in a node group are still correct.

  @type cfg: L{config.ConfigWriter}
  @param cfg: The cluster configuration
  @type group_uuid: string
  @param group_uuid: Node group UUID
  @type owned_instances: set or frozenset
  @param owned_instances: List of currently owned instances

  """
  wanted_instances = cfg.GetNodeGroupInstances(group_uuid)
  if owned_instances != wanted_instances:
    raise errors.OpPrereqError("Instances in node group '%s' changed since"
                               " locks were acquired, wanted '%s', have '%s';"
                               " retry the operation" %
                               (group_uuid,
                                utils.CommaJoin(wanted_instances),
                                utils.CommaJoin(owned_instances)),
                               errors.ECODE_STATE)

  return wanted_instances


640
641
642
643
644
645
646
647
648
649
650
651
652
def _SupportsOob(cfg, node):
  """Tells if node supports OOB.

  @type cfg: L{config.ConfigWriter}
  @param cfg: The cluster configuration
  @type node: L{objects.Node}
  @param node: The node
  @return: The OOB script if supported or an empty string otherwise

  """
  return cfg.GetNdParams(node)[constants.ND_OOB_PROGRAM]


653
def _GetWantedNodes(lu, nodes):
654
  """Returns list of checked and expanded node names.
655

656
657
658
659
660
661
  @type lu: L{LogicalUnit}
  @param lu: the logical unit on whose behalf we execute
  @type nodes: list
  @param nodes: list of node names or None for all nodes
  @rtype: list
  @return: the list of nodes, sorted
Iustin Pop's avatar
Iustin Pop committed
662
  @raise errors.ProgrammerError: if the nodes parameter is wrong type
663
664

  """
665
666
  if nodes:
    return [_ExpandNodeName(lu.cfg, name) for name in nodes]
667

668
  return utils.NiceSort(lu.cfg.GetNodeList())
669
670
671


def _GetWantedInstances(lu, instances):
672
  """Returns list of checked and expanded instance names.
673

674
675
676
677
678
679
680
681
  @type lu: L{LogicalUnit}
  @param lu: the logical unit on whose behalf we execute
  @type instances: list
  @param instances: list of instance names or None for all instances
  @rtype: list
  @return: the list of instances, sorted
  @raise errors.OpPrereqError: if the instances parameter is wrong type
  @raise errors.OpPrereqError: if any of the passed instances is not found
682
683
684

  """
  if instances:
685
    wanted = [_ExpandInstanceName(lu.cfg, name) for name in instances]
686
  else:
687
688
    wanted = utils.NiceSort(lu.cfg.GetInstanceList())
  return wanted
689
690


691
692
def _GetUpdatedParams(old_params, update_dict,
                      use_default=True, use_none=False):
693
694
695
696
697
698
699
700
  """Return the new version of a parameter dictionary.

  @type old_params: dict
  @param old_params: old parameters
  @type update_dict: dict
  @param update_dict: dict containing new parameter values, or
      constants.VALUE_DEFAULT to reset the parameter to its default
      value
701
702
703
704
705
706
  @param use_default: boolean
  @type use_default: whether to recognise L{constants.VALUE_DEFAULT}
      values as 'to be deleted' values
  @param use_none: boolean
  @type use_none: whether to recognise C{None} values as 'to be
      deleted' values
707
708
709
710
711
712
  @rtype: dict
  @return: the new parameter dictionary

  """
  params_copy = copy.deepcopy(old_params)
  for key, val in update_dict.iteritems():
713
714
    if ((use_default and val == constants.VALUE_DEFAULT) or
        (use_none and val is None)):
715
716
717
718
719
720
721
722
723
      try:
        del params_copy[key]
      except KeyError:
        pass
    else:
      params_copy[key] = val
  return params_copy


724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
def _UpdateAndVerifySubDict(base, updates, type_check):
  """Updates and verifies a dict with sub dicts of the same type.

  @param base: The dict with the old data
  @param updates: The dict with the new data
  @param type_check: Dict suitable to ForceDictType to verify correct types
  @returns: A new dict with updated and verified values

  """
  def fn(old, value):
    new = _GetUpdatedParams(old, value)
    utils.ForceDictType(new, type_check)
    return new

  ret = copy.deepcopy(base)
  ret.update(dict((key, fn(base.get(key, {}), value))
                  for key, value in updates.items()))
  return ret


744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
def _MergeAndVerifyHvState(op_input, obj_input):
  """Combines the hv state from an opcode with the one of the object

  @param op_input: The input dict from the opcode
  @param obj_input: The input dict from the objects
  @return: The verified and updated dict

  """
  if op_input:
    invalid_hvs = set(op_input) - constants.HYPER_TYPES
    if invalid_hvs:
      raise errors.OpPrereqError("Invalid hypervisor(s) in hypervisor state:"
                                 " %s" % utils.CommaJoin(invalid_hvs),
                                 errors.ECODE_INVAL)
    if obj_input is None:
      obj_input = {}
    type_check = constants.HVSTS_PARAMETER_TYPES
    return _UpdateAndVerifySubDict(obj_input, op_input, type_check)

  return None


def _MergeAndVerifyDiskState(op_input, obj_input):
  """Combines the disk state from an opcode with the one of the object

  @param op_input: The input dict from the opcode
  @param obj_input: The input dict from the objects
  @return: The verified and updated dict
  """
  if op_input:
    invalid_dst = set(op_input) - constants.DS_VALID_TYPES
    if invalid_dst:
      raise errors.OpPrereqError("Invalid storage type(s) in disk state: %s" %
                                 utils.CommaJoin(invalid_dst),
                                 errors.ECODE_INVAL)
    type_check = constants.DSS_PARAMETER_TYPES
    if obj_input is None:
      obj_input = {}
    return dict((key, _UpdateAndVerifySubDict(obj_input.get(key, {}), value,
                                              type_check))
                for key, value in op_input.items())

  return None


789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
def _ReleaseLocks(lu, level, names=None, keep=None):
  """Releases locks owned by an LU.

  @type lu: L{LogicalUnit}
  @param level: Lock level
  @type names: list or None
  @param names: Names of locks to release
  @type keep: list or None
  @param keep: Names of locks to retain

  """
  assert not (keep is not None and names is not None), \
         "Only one of the 'names' and the 'keep' parameters can be given"

  if names is not None:
    should_release = names.__contains__
  elif keep:
    should_release = lambda name: name not in keep
  else:
    should_release = None

810
811
812
813
814
815
  owned = lu.owned_locks(level)
  if not owned:
    # Not owning any lock at this level, do nothing
    pass

  elif should_release:
816
817
818
819
    retain = []
    release = []

    # Determine which locks to release
820
    for name in owned:
821
822
823
824
825
      if should_release(name):
        release.append(name)
      else:
        retain.append(name)

Iustin Pop's avatar
Iustin Pop committed
826
    assert len(lu.owned_locks(level)) == (len(retain) + len(release))
827
828

    # Release just some locks
829
    lu.glm.release(level, names=release)
830

Iustin Pop's avatar
Iustin Pop committed
831
    assert frozenset(lu.owned_locks(level)) == frozenset(retain)
832
833
  else:
    # Release everything
834
    lu.glm.release(level)
835

836
    assert not lu.glm.is_owned(level), "No locks should be owned"
837
838


839
840
841
842
843
844
845
846
847
848
849
850
851
def _MapInstanceDisksToNodes(instances):
  """Creates a map from (node, volume) to instance name.

  @type instances: list of L{objects.Instance}
  @rtype: dict; tuple of (node name, volume name) as key, instance name as value

  """
  return dict(((node, vol), inst.name)
              for inst in instances
              for (node, vols) in inst.MapLVsByNode().items()
              for vol in vols)


852
853
854
855
def _RunPostHook(lu, node_name):
  """Runs the post-hook for an opcode on a single node.

  """
Andrea Spadaccini's avatar
Andrea Spadaccini committed
856
  hm = lu.proc.BuildHooksManager(lu)
857
858
859
  try:
    hm.RunPhase(constants.HOOKS_PHASE_POST, nodes=[node_name])
  except:
860
    # pylint: disable=W0702
861
862
863
    lu.LogWarning("Errors occurred running hooks on %s" % node_name)


864
def _CheckOutputFields(static, dynamic, selected):
865
866
  """Checks whether all selected fields are valid.

Iustin Pop's avatar
Iustin Pop committed
867
  @type static: L{utils.FieldSet}
Iustin Pop's avatar
Iustin Pop committed
868
  @param static: static fields set
Iustin Pop's avatar
Iustin Pop committed
869
  @type dynamic: L{utils.FieldSet}
Iustin Pop's avatar
Iustin Pop committed
870
  @param dynamic: dynamic fields set
871
872

  """
Iustin Pop's avatar
Iustin Pop committed
873
  f = utils.FieldSet()
Iustin Pop's avatar
Iustin Pop committed
874
875
  f.Extend(static)
  f.Extend(dynamic)
876

Iustin Pop's avatar
Iustin Pop committed
877
878
  delta = f.NonMatching(selected)
  if delta:
879
    raise errors.OpPrereqError("Unknown output fields selected: %s"
880
                               % ",".join(delta), errors.ECODE_INVAL)
881
882


883
884
885
886
887
888
889
890
891
892
893
def _CheckGlobalHvParams(params):
  """Validates that given hypervisor params are not global ones.

  This will ensure that instances don't get customised versions of
  global params.

  """
  used_globals = constants.HVC_GLOBALS.intersection(params)
  if used_globals:
    msg = ("The following hypervisor parameters are global and cannot"
           " be customized at instance level, please modify them at"
894
           " cluster level: %s" % utils.CommaJoin(used_globals))
895
896
897
    raise errors.OpPrereqError(msg, errors.ECODE_INVAL)


898
def _CheckNodeOnline(lu, node, msg=None):
899
900
901
902
  """Ensure that a given node is online.

  @param lu: the LU on behalf of which we make the check
  @param node: the node to check
903
  @param msg: if passed, should be a message to replace the default one
904
  @raise errors.OpPrereqError: if the node is offline
905
906

  """
907
908
  if msg is None:
    msg = "Can't use offline node"
909
  if lu.cfg.GetNodeInfo(node).offline:
910
    raise errors.OpPrereqError("%s: %s" % (msg, node), errors.ECODE_STATE)
911
912


913
914
915
916
917
918
919
920
921
def _CheckNodeNotDrained(lu, node):
  """Ensure that a given node is not drained.

  @param lu: the LU on behalf of which we make the check
  @param node: the node to check
  @raise errors.OpPrereqError: if the node is drained

  """
  if lu.cfg.GetNodeInfo(node).drained:
922
    raise errors.OpPrereqError("Can't use drained node %s" % node,
923
924
925
926
927
928
929
930
931
932
933
934
935
936
                               errors.ECODE_STATE)


def _CheckNodeVmCapable(lu, node):
  """Ensure that a given node is vm capable.

  @param lu: the LU on behalf of which we make the check
  @param node: the node to check
  @raise errors.OpPrereqError: if the node is not vm capable

  """
  if not lu.cfg.GetNodeInfo(node).vm_capable:
    raise errors.OpPrereqError("Can't use non-vm_capable node %s" % node,
                               errors.ECODE_STATE)
937
938


Iustin Pop's avatar
Iustin Pop committed
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
def _CheckNodeHasOS(lu, node, os_name, force_variant):
  """Ensure that a node supports a given OS.

  @param lu: the LU on behalf of which we make the check
  @param node: the node to check
  @param os_name: the OS to query about
  @param force_variant: whether to ignore variant errors
  @raise errors.OpPrereqError: if the node is not supporting the OS

  """
  result = lu.rpc.call_os_get(node, os_name)
  result.Raise("OS '%s' not in supported OS list for node %s" %
               (os_name, node),
               prereq=True, ecode=errors.ECODE_INVAL)
  if not force_variant:
    _CheckOSVariant(result.payload, os_name)


957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
def _CheckNodeHasSecondaryIP(lu, node, secondary_ip, prereq):
  """Ensure that a node has the given secondary ip.

  @type lu: L{LogicalUnit}
  @param lu: the LU on behalf of which we make the check
  @type node: string
  @param node: the node to check
  @type secondary_ip: string
  @param secondary_ip: the ip to check
  @type prereq: boolean
  @param prereq: whether to throw a prerequisite or an execute error
  @raise errors.OpPrereqError: if the node doesn't have the ip, and prereq=True
  @raise errors.OpExecError: if the node doesn't have the ip, and prereq=False

  """
  result = lu.rpc.call_node_has_ip_address(node, secondary_ip)
  result.Raise("Failure checking secondary ip on node %s" % node,
               prereq=prereq, ecode=errors.ECODE_ENVIRON)
  if not result.payload:
    msg = ("Node claims it doesn't have the secondary ip you gave (%s),"
           " please fix and re-run this command" % secondary_ip)
    if prereq:
      raise errors.OpPrereqError(msg, errors.ECODE_ENVIRON)
    else:
      raise errors.OpExecError(msg)


984
985
986
987
988
989
990
def _GetClusterDomainSecret():
  """Reads the cluster domain secret.

  """
  return utils.ReadOneLineFile(constants.CLUSTER_DOMAIN_SECRET_FILE,
                               strict=True)

991

992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
def _CheckInstanceState(lu, instance, req_states, msg=None):
  """Ensure that an instance is in one of the required states.

  @param lu: the LU on behalf of which we make the check
  @param instance: the instance to check
  @param msg: if passed, should be a message to replace the default one
  @raise errors.OpPrereqError: if the instance is not in the required state

  """
  if msg is None:
    msg = "can't use instance from outside %s states" % ", ".join(req_states)
  if instance.admin_state not in req_states:
    raise errors.OpPrereqError("Instance %s is marked to be %s, %s" %
                               (instance, instance.admin_state, msg),
                               errors.ECODE_STATE)
1007

1008
1009
1010
1011
1012
  if constants.ADMINST_UP not in req_states:
    pnode = instance.primary_node
    ins_l = lu.rpc.call_instance_list([pnode], [instance.hypervisor])[pnode]
    ins_l.Raise("Can't contact node %s for instance information" % pnode,
                prereq=True, ecode=errors.ECODE_ENVIRON)
1013

1014
1015
1016
    if instance.name in ins_l.payload:
      raise errors.OpPrereqError("Instance %s is running, %s" %
                                 (instance.name, msg), errors.ECODE_STATE)
1017
1018


1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
def _ExpandItemName(fn, name, kind):
  """Expand an item name.

  @param fn: the function to use for expansion
  @param name: requested item name
  @param kind: text description ('Node' or 'Instance')
  @return: the resolved (full) name
  @raise errors.OpPrereqError: if the item is not found

  """
  full_name = fn(name)
  if full_name is None:
    raise errors.OpPrereqError("%s '%s' not known" % (kind, name),
                               errors.ECODE_NOENT)
  return full_name


def _ExpandNodeName(cfg, name):
  """Wrapper over L{_ExpandItemName} for nodes."""
  return _ExpandItemName(cfg.ExpandNodeName, name, "Node")


def _ExpandInstanceName(cfg, name):
  """Wrapper over L{_ExpandItemName} for instance."""
  return _ExpandItemName(cfg.ExpandInstanceName, name, "Instance")


1046
def _BuildInstanceHookEnv(name, primary_node, secondary_nodes, os_type, status,
1047
                          minmem, maxmem, vcpus, nics, disk_template, disks,
1048
                          bep, hvp, hypervisor_name, tags):
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
  """Builds instance related env variables for hooks

  This builds the hook environment from individual variables.

  @type name: string
  @param name: the name of the instance
  @type primary_node: string
  @param primary_node: the name of the instance's primary node
  @type secondary_nodes: list
  @param secondary_nodes: list of secondary nodes as strings
  @type os_type: string
  @param os_type: the name of the instance's OS
1061
1062
  @type status: string
  @param status: the desired status of the instance
1063
1064
1065
1066
  @type minmem: string
  @param minmem: the minimum memory size of the instance
  @type maxmem: string
  @param maxmem: the maximum memory size of the instance
1067
1068
1069
  @type vcpus: string
  @param vcpus: the count of VCPUs the instance has
  @type nics: list
1070
1071
  @param nics: list of tuples (ip, mac, mode, link) representing
      the NICs the instance has
Iustin Pop's avatar
Iustin Pop committed
1072
  @type disk_template: string
Michael Hanselmann's avatar
Michael Hanselmann committed
1073
  @param disk_template: the disk template of the instance
Iustin Pop's avatar
Iustin Pop committed
1074
1075
  @type disks: list
  @param disks: the list of (size, mode) pairs
1076
1077
1078
1079
  @type bep: dict
  @param bep: the backend parameters for the instance
  @type hvp: dict
  @param hvp: the hypervisor parameters for the instance
Michael Hanselmann's avatar
Michael Hanselmann committed
1080
1081
  @type hypervisor_name: string
  @param hypervisor_name: the hypervisor for the instance
1082
1083
  @type tags: list
  @param tags: list of instance tags as strings
1084
1085
  @rtype: dict
  @return: the hook environment for this instance
1086

1087
1088
  """
  env = {
1089
    "OP_TARGET": name,
1090
1091
1092
    "INSTANCE_NAME": name,
    "INSTANCE_PRIMARY": primary_node,
    "INSTANCE_SECONDARIES": " ".join(secondary_nodes),
1093
    "INSTANCE_OS_TYPE": os_type,
1094
    "INSTANCE_STATUS": status,
1095
1096
1097
1098
    "INSTANCE_MINMEM": minmem,
    "INSTANCE_MAXMEM": maxmem,
    # TODO(2.7) remove deprecated "memory" value
    "INSTANCE_MEMORY": maxmem,
1099
    "INSTANCE_VCPUS": vcpus,
Iustin Pop's avatar
Iustin Pop committed
1100
    "INSTANCE_DISK_TEMPLATE": disk_template,
Michael Hanselmann's avatar
Michael Hanselmann committed
1101
    "INSTANCE_HYPERVISOR": hypervisor_name,
1102
1103
1104
  }
  if nics:
    nic_count = len(nics)
1105
    for idx, (ip, mac, mode, link) in enumerate(nics):
1106
1107
1108
      if ip is None:
        ip = ""
      env["INSTANCE_NIC%d_IP" % idx] = ip
Iustin Pop's avatar
Iustin Pop committed
1109
      env["INSTANCE_NIC%d_MAC" % idx] = mac
1110
1111
1112
1113
      env["INSTANCE_NIC%d_MODE" % idx] = mode
      env["INSTANCE_NIC%d_LINK" % idx] = link
      if mode == constants.NIC_MODE_BRIDGED:
        env["INSTANCE_NIC%d_BRIDGE" % idx] = link
1114
1115
1116
1117
1118
  else:
    nic_count = 0

  env["INSTANCE_NIC_COUNT"] = nic_count

Iustin Pop's avatar
Iustin Pop committed
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
  if disks:
    disk_count = len(disks)
    for idx, (size, mode) in enumerate(disks):
      env["INSTANCE_DISK%d_SIZE" % idx] = size
      env["INSTANCE_DISK%d_MODE" % idx] = mode
  else:
    disk_count = 0

  env["INSTANCE_DISK_COUNT"] = disk_count

1129
1130
1131
1132
1133
  if not tags:
    tags = []

  env["INSTANCE_TAGS"] = " ".join(tags)

1134
1135
1136
1137
  for source, kind in [(bep, "BE"), (hvp, "HV")]:
    for key, value in source.items():
      env["INSTANCE_%s_%s" % (kind, key)] = value

1138
1139
  return env

1140

1141
def _NICListToTuple(lu, nics):
1142
1143
  """Build a list of nic information tuples.

1144
  This list is suitable to be passed to _BuildInstanceHookEnv or as a return
1145
  value in LUInstanceQueryData.
1146
1147
1148
1149
1150
1151
1152
1153

  @type lu:  L{LogicalUnit}
  @param lu: the logical unit on whose behalf we execute
  @type nics: list of L{objects.NIC}
  @param nics: list of nics to convert to hooks tuples

  """
  hooks_nics = []
1154
  cluster = lu.cfg.GetClusterInfo()
1155
1156
1157
  for nic in nics:
    ip = nic.ip
    mac = nic.mac
1158
    filled_params = cluster.SimpleFillNIC(nic.nicparams)
1159
1160
1161
1162
    mode = filled_params[constants.NIC_MODE]
    link = filled_params[constants.NIC_LINK]
    hooks_nics.append((ip, mac, mode, link))
  return hooks_nics
1163

1164

Iustin Pop's avatar
Iustin Pop committed
1165
def _BuildInstanceHookEnvByObject(lu, instance, override=None):
1166
1167
  """Builds instance related env variables for hooks from an object.

1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
  @type lu: L{LogicalUnit}
  @param lu: the logical unit on whose behalf we execute
  @type instance: L{objects.Instance}
  @param instance: the instance for which we should build the
      environment
  @type override: dict
  @param override: dictionary with key/values that will override
      our values
  @rtype: dict
  @return: the hook environment dictionary

1179
  """
1180
1181
1182
  cluster = lu.cfg.GetClusterInfo()
  bep = cluster.FillBE(instance)
  hvp = cluster.FillHV(instance)
1183
  args = {
Iustin Pop's avatar
Iustin Pop committed
1184
1185
1186
1187
    "name": instance.name,
    "primary_node": instance.primary_node,
    "secondary_nodes": instance.secondary_nodes,
    "os_type": instance.os,
1188
    "status": instance.admin_state,
1189
1190
    "maxmem": bep[constants.BE_MAXMEM],
    "minmem": bep[constants.BE_MINMEM],
Iustin Pop's avatar
Iustin Pop committed
1191
1192
1193
1194
1195
1196
1197
1198
    "vcpus": bep[constants.BE_VCPUS],
    "nics": _NICListToTuple(lu, instance.nics),
    "disk_template": instance.disk_template,
    "disks": [(disk.size, disk.mode) for disk in instance.disks],
    "bep": bep,
    "hvp": hvp,
    "hypervisor_name": instance.hypervisor,
    "tags": instance.tags,
1199
1200
1201
  }
  if override:
    args.update(override)
1202
  return _BuildInstanceHookEnv(**args) # pylint: disable=W0142
1203
1204


Guido Trotter's avatar
Guido Trotter committed
1205
def _AdjustCandidatePool(lu, exceptions):
1206
1207
1208
  """Adjust the candidate pool after node operations.

  """
Guido Trotter's avatar
Guido Trotter committed
1209
  mod_list = lu.cfg.MaintainCandidatePool(exceptions)
1210
1211
  if mod_list:
    lu.LogInfo("Promoted nodes to master candidate role: %s",
1212
               utils.CommaJoin(node.name for node in mod_list))
1213
1214
    for name in mod_list:
      lu.context.ReaddNode(name)
Guido Trotter's avatar
Guido Trotter committed
1215
  mc_now, mc_max, _ = lu.cfg.GetMasterCandidateStats(exceptions)
1216
1217
1218
1219
1220
  if mc_now > mc_max:
    lu.LogInfo("Note: more nodes are candidates (%d) than desired (%d)" %
               (mc_now, mc_max))


1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
def _DecideSelfPromotion(lu, exceptions=None):
  """Decide whether I should promote myself as a master candidate.

  """
  cp_size = lu.cfg.GetClusterInfo().candidate_pool_size
  mc_now, mc_should, _ = lu.cfg.GetMasterCandidateStats(exceptions)
  # the new node will increase mc_max with one, so:
  mc_should = min(mc_should + 1, cp_size)
  return mc_now < mc_should


1232
def _CheckNicsBridgesExist(lu, target_nics, target_node):
1233
1234
1235
  """Check that the brigdes needed by a list of nics exist.

  """
1236
1237
  cluster = lu.cfg.GetClusterInfo()
  paramslist = [cluster.SimpleFillNIC(nic.nicparams) for nic in target_nics]
1238
1239
1240
1241
  brlist = [params[constants.NIC_LINK] for params in paramslist
            if params[constants.NIC_MODE] == constants.NIC_MODE_BRIDGED]
  if brlist:
    result = lu.rpc.call_bridges_exist(target_node, brlist)
1242
    result.Raise("Error checking bridges on destination node '%s'" %
1243
                 target_node, prereq=True, ecode=errors.ECODE_ENVIRON)
1244
1245
1246


def _CheckInstanceBridgesExist(lu, instance, node=None):
1247
1248
1249
  """Check that the brigdes needed by an instance exist.

  """
1250
  if node is None:
Iustin Pop's avatar
Iustin Pop committed
1251
    node = instance.primary_node
1252
  _CheckNicsBridgesExist(lu, instance.nics, node)
1253
1254


Iustin Pop's avatar
Iustin Pop committed
1255
def _CheckOSVariant(os_obj, name):
Guido Trotter's avatar
Guido Trotter committed
1256
1257
  """Check whether an OS name conforms to the os variants specification.

Iustin Pop's avatar
Iustin Pop committed
1258
1259
  @type os_obj: L{objects.OS}
  @param os_obj: OS object to check
Guido Trotter's avatar
Guido Trotter committed
1260
1261
1262
1263
  @type name: string
  @param name: OS name passed by the user, to check for validity

  """
1264
  variant = objects.OS.GetVariant(name)
Iustin Pop's avatar
Iustin Pop committed
1265
  if not os_obj.supported_variants:
1266
1267
1268
1269
    if variant:
      raise errors.OpPrereqError("OS '%s' doesn't support variants ('%s'"
                                 " passed)" % (os_obj.name, variant),
                                 errors.ECODE_INVAL)
Guido Trotter's avatar
Guido Trotter committed
1270
    return
1271
  if not variant:
1272
1273
    raise errors.OpPrereqError("OS name must include a variant",
                               errors.ECODE_INVAL)
Guido Trotter's avatar
Guido Trotter committed
1274

Iustin Pop's avatar
Iustin Pop committed
1275
  if variant not in os_obj.supported_variants:
1276
    raise errors.OpPrereqError("Unsupported OS variant", errors.ECODE_INVAL)
Guido Trotter's avatar
Guido Trotter committed
1277
1278


1279
1280
1281
1282
def _GetNodeInstancesInner(cfg, fn):
  return [i for i in cfg.GetAllInstancesInfo().values() if fn(i)]


1283
1284
1285
1286
1287
1288
1289
1290
def _GetNodeInstances(cfg, node_name):
  """Returns a list of all primary and secondary instances on a node.

  """

  return _GetNodeInstancesInner(cfg, lambda inst: node_name in inst.all_nodes)


1291
1292
1293
1294
def _GetNodePrimaryInstances(cfg, node_name):
  """Returns primary instances on a node.

  """
1295
1296
  return _GetNodeInstancesInner(cfg,
                                lambda inst: node_name == inst.primary_node)
1297
1298


1299
1300
1301
1302
def _GetNodeSecondaryInstances(cfg, node_name):
  """Returns secondary instances on a node.

  """
1303
1304
  return _GetNodeInstancesInner(cfg,
                                lambda inst: node_name in inst.secondary_nodes)
1305
1306


1307
1308
1309
1310
1311
1312
def _GetStorageTypeArgs(cfg, storage_type):
  """Returns the arguments for a storage type.

  """
  # Special case for file storage
  if storage_type == constants.ST_FILE:
1313
    # storage.FileStorage wants a list of storage directories
1314
    return [[cfg.GetFileStorageDir(), cfg.GetSharedFileStorageDir()]]
1315
1316
1317
1318

  return []


1319
def _FindFaultyInstanceDisks(cfg, rpc_runner, instance, node_name, prereq):
1320
1321
1322
1323
1324
  faulty = []

  for dev in instance.disks:
    cfg.SetDiskID(dev, node_name)

1325
  result = rpc_runner.call_blockdev_getmirrorstatus(node_name, instance.disks)
1326
  result.Raise("Failed to get disk status from node %s" % node_name,
1327
               prereq=prereq, ecode=errors.ECODE_ENVIRON)
1328
1329
1330
1331
1332
1333
1334
1335

  for idx, bdev_status in enumerate(result.payload):
    if bdev_status and bdev_status.ldisk_status == constants.LDS_FAULTY:
      faulty.append(idx)

  return faulty


1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
def _CheckIAllocatorOrNode(lu, iallocator_slot, node_slot):
  """Check the sanity of iallocator and node arguments and use the
  cluster-wide iallocator if appropriate.

  Check that at most one of (iallocator, node) is specified. If none is
  specified, then the LU's opcode's iallocator slot is filled with the
  cluster-wide default iallocator.

  @type iallocator_slot: string
  @param iallocator_slot: the name of the opcode iallocator slot
  @type node_slot: string
  @param node_slot: the name of the opcode target node slot

  """
  node = getattr(lu.op, node_slot, None)
  iallocator = getattr(lu.op, iallocator_slot, None)

  if node is not None and iallocator is not None:
1354
    raise errors.OpPrereqError("Do not specify both, iallocator and node",
1355
1356
1357