cmdlib.py 432 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

Iustin Pop's avatar
Iustin Pop committed
24
# pylint: disable-msg=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

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

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
Iustin Pop's avatar
Iustin Pop committed
43 44 45 46 47

from ganeti import ssh
from ganeti import utils
from ganeti import errors
from ganeti import hypervisor
Guido Trotter's avatar
Guido Trotter committed
48
from ganeti import locking
Iustin Pop's avatar
Iustin Pop committed
49 50
from ganeti import constants
from ganeti import objects
51
from ganeti import serializer
52
from ganeti import ssconf
53
from ganeti import uidpool
54
from ganeti import compat
55
from ganeti import masterd
56
from ganeti import netutils
57 58
from ganeti import query
from ganeti import qlang
59
from ganeti import opcodes
60 61

import ganeti.masterd.instance # pylint: disable-msg=W0611
62

Iustin Pop's avatar
Iustin Pop committed
63

64 65 66 67 68 69 70 71 72 73 74 75 76
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]


77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98
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
99
class LogicalUnit(object):
100
  """Logical Unit base class.
Iustin Pop's avatar
Iustin Pop committed
101 102

  Subclasses must follow these rules:
103
    - implement ExpandNames
104 105
    - implement CheckPrereq (except when tasklets are used)
    - implement Exec (except when tasklets are used)
Iustin Pop's avatar
Iustin Pop committed
106
    - implement BuildHooksEnv
107
    - implement BuildHooksNodes
Iustin Pop's avatar
Iustin Pop committed
108
    - redefine HPATH and HTYPE
109
    - optionally redefine their run requirements:
110
        REQ_BGL: the LU needs to hold the Big Ganeti Lock exclusively
111 112

  Note that all commands require root permissions.
Iustin Pop's avatar
Iustin Pop committed
113

114 115 116
  @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
117 118 119
  """
  HPATH = None
  HTYPE = None
120
  REQ_BGL = True
Iustin Pop's avatar
Iustin Pop committed
121

Iustin Pop's avatar
Iustin Pop committed
122
  def __init__(self, processor, op, context, rpc):
Iustin Pop's avatar
Iustin Pop committed
123 124
    """Constructor for LogicalUnit.

Michael Hanselmann's avatar
Michael Hanselmann committed
125
    This needs to be overridden in derived classes in order to check op
Iustin Pop's avatar
Iustin Pop committed
126 127 128
    validity.

    """
Iustin Pop's avatar
Iustin Pop committed
129
    self.proc = processor
Iustin Pop's avatar
Iustin Pop committed
130
    self.op = op
Guido Trotter's avatar
Guido Trotter committed
131
    self.cfg = context.cfg
132
    self.glm = context.glm
Guido Trotter's avatar
Guido Trotter committed
133
    self.context = context
Iustin Pop's avatar
Iustin Pop committed
134
    self.rpc = rpc
135
    # Dicts used to declare locking needs to mcpu
136
    self.needed_locks = None
137
    self.share_locks = dict.fromkeys(locking.LEVELS, 0)
138 139
    self.add_locks = {}
    self.remove_locks = {}
140 141
    # Used to force good behavior when calling helper functions
    self.recalculate_locks = {}
142
    # logging
143
    self.Log = processor.Log # pylint: disable-msg=C0103
Iustin Pop's avatar
Iustin Pop committed
144 145
    self.LogWarning = processor.LogWarning # pylint: disable-msg=C0103
    self.LogInfo = processor.LogInfo # pylint: disable-msg=C0103
146
    self.LogStep = processor.LogStep # pylint: disable-msg=C0103
147 148
    # support for dry-run
    self.dry_run_result = None
149 150 151 152
    # 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
153

154
    # Tasklets
155
    self.tasklets = None
156

157 158
    # Validate opcode parameters and set defaults
    self.op.Validate(True)
159

160
    self.CheckArguments()
Iustin Pop's avatar
Iustin Pop committed
161

162 163 164 165 166 167 168 169 170
  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
171
      - CheckPrereq is run after we have acquired locks (and possible
172 173 174 175 176 177 178 179
        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

180 181 182 183 184 185
  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
186
    completed). This way locking, hooks, logging, etc. can work correctly.
187 188 189 190

    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:
191 192 193 194 195

      - 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
196

Guido Trotter's avatar
Guido Trotter committed
197 198 199 200
    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.

201 202 203 204
    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.

205 206 207 208 209
    Examples::

      # Acquire all nodes and one instance
      self.needed_locks = {
        locking.LEVEL_NODE: locking.ALL_SET,
210
        locking.LEVEL_INSTANCE: ['instance1.example.com'],
211 212 213
      }
      # Acquire just two nodes
      self.needed_locks = {
214
        locking.LEVEL_NODE: ['node1.example.com', 'node2.example.com'],
215 216 217
      }
      # Acquire no locks
      self.needed_locks = {} # No, you can't leave it to the default value None
218 219 220 221 222 223 224 225 226 227

    """
    # 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
228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245
  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
246 247 248 249 250 251 252 253 254 255 256 257
  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
258
    their canonical form if it hasn't been done by ExpandNames before.
Iustin Pop's avatar
Iustin Pop committed
259 260

    """
261
    if self.tasklets is not None:
262
      for (idx, tl) in enumerate(self.tasklets):
263 264
        logging.debug("Checking prerequisites for tasklet %s/%s",
                      idx + 1, len(self.tasklets))
265 266
        tl.CheckPrereq()
    else:
267
      pass
Iustin Pop's avatar
Iustin Pop committed
268 269 270 271 272 273 274 275 276

  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.

    """
277
    if self.tasklets is not None:
278
      for (idx, tl) in enumerate(self.tasklets):
279
        logging.debug("Executing tasklet %s/%s", idx + 1, len(self.tasklets))
280 281 282
        tl.Exec(feedback_fn)
    else:
      raise NotImplementedError
Iustin Pop's avatar
Iustin Pop committed
283 284 285 286

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

287 288 289 290 291 292 293 294
    @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
295

296 297
    """
    raise NotImplementedError
Iustin Pop's avatar
Iustin Pop committed
298

299 300
  def BuildHooksNodes(self):
    """Build list of nodes to run LU's hooks.
Iustin Pop's avatar
Iustin Pop committed
301

302 303 304 305 306 307 308
    @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
309 310 311 312

    """
    raise NotImplementedError

313 314 315 316 317 318 319 320 321
  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.

322 323 324 325 326 327 328 329
    @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
330 331

    """
332 333 334
    # API must be kept, thus we ignore the unused argument and could
    # be a function warnings
    # pylint: disable-msg=W0613,R0201
335 336
    return lu_result

337 338 339 340 341 342 343 344 345 346 347 348 349 350 351
  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"
352 353 354
    self.op.instance_name = _ExpandInstanceName(self.cfg,
                                                self.op.instance_name)
    self.needed_locks[locking.LEVEL_INSTANCE] = self.op.instance_name
355

356
  def _LockInstancesNodes(self, primary_only=False):
357 358 359 360 361 362 363 364 365 366 367 368 369
    """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.

370
    If should be called in DeclareLocks in a way similar to::
371

372 373
      if level == locking.LEVEL_NODE:
        self._LockInstancesNodes()
374

375 376 377
    @type primary_only: boolean
    @param primary_only: only lock primary nodes of locked instances

378 379 380 381 382 383 384 385 386 387
    """
    assert locking.LEVEL_NODE in self.recalculate_locks, \
      "_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 = []
388
    for instance_name in self.glm.list_owned(locking.LEVEL_INSTANCE):
389 390
      instance = self.context.cfg.GetInstanceInfo(instance_name)
      wanted_nodes.append(instance.primary_node)
391 392
      if not primary_only:
        wanted_nodes.extend(instance.secondary_nodes)
393 394 395 396 397

    if self.recalculate_locks[locking.LEVEL_NODE] == constants.LOCKS_REPLACE:
      self.needed_locks[locking.LEVEL_NODE] = wanted_nodes
    elif self.recalculate_locks[locking.LEVEL_NODE] == constants.LOCKS_APPEND:
      self.needed_locks[locking.LEVEL_NODE].extend(wanted_nodes)
398 399 400

    del self.recalculate_locks[locking.LEVEL_NODE]

Iustin Pop's avatar
Iustin Pop committed
401

Iustin Pop's avatar
Iustin Pop committed
402
class NoHooksLU(LogicalUnit): # pylint: disable-msg=W0223
Iustin Pop's avatar
Iustin Pop committed
403 404 405 406 407 408 409 410 411
  """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

412 413 414 415 416 417
  def BuildHooksEnv(self):
    """Empty BuildHooksEnv for NoHooksLu.

    This just raises an error.

    """
418 419 420 421 422 423 424
    raise AssertionError("BuildHooksEnv called for NoHooksLUs")

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

    """
    raise AssertionError("BuildHooksNodes called for NoHooksLU")
425

Iustin Pop's avatar
Iustin Pop committed
426

427 428 429 430 431 432 433 434 435 436 437 438
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

  """
439 440 441 442 443 444 445
  def __init__(self, lu):
    self.lu = lu

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

446 447 448 449 450 451 452 453 454 455 456 457 458 459
  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.

    """
460
    pass
461 462 463 464 465 466 467 468 469 470 471 472

  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


473 474 475 476 477 478 479
class _QueryBase:
  """Base for query utility classes.

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

480
  def __init__(self, filter_, fields, use_locking):
481 482 483 484 485
    """Initializes this class.

    """
    self.use_locking = use_locking

486 487
    self.query = query.Query(self.FIELDS, fields, filter_=filter_,
                             namefield="name")
488
    self.requested_data = self.query.RequestedData()
489
    self.names = self.query.RequestedNames()
490

491 492 493
    # Sort only if no names were requested
    self.sort_by_name = not self.names

494 495 496 497 498 499 500 501
    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:
502
      names = lu.glm.list_owned(lock_level)
503 504 505 506 507 508 509 510 511 512
    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
513
    assert not self.do_locking or lu.glm.is_owned(lock_level)
514 515 516 517 518 519 520 521 522

    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

523 524 525 526 527 528 529 530
  def ExpandNames(self, lu):
    """Expand names for this query.

    See L{LogicalUnit.ExpandNames}.

    """
    raise NotImplementedError()

531
  def DeclareLocks(self, lu, level):
532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550
    """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.

    """
551 552
    return query.GetQueryResponse(self.query, self._GetQueryData(lu),
                                  sort_by_name=self.sort_by_name)
553 554 555 556 557

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

    """
558 559
    return self.query.OldStyleQuery(self._GetQueryData(lu),
                                    sort_by_name=self.sort_by_name)
560 561


562
def _GetWantedNodes(lu, nodes):
563
  """Returns list of checked and expanded node names.
564

565 566 567 568 569 570
  @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
571
  @raise errors.ProgrammerError: if the nodes parameter is wrong type
572 573

  """
574 575
  if nodes:
    return [_ExpandNodeName(lu.cfg, name) for name in nodes]
576

577
  return utils.NiceSort(lu.cfg.GetNodeList())
578 579 580


def _GetWantedInstances(lu, instances):
581
  """Returns list of checked and expanded instance names.
582

583 584 585 586 587 588 589 590
  @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
591 592 593

  """
  if instances:
594
    wanted = [_ExpandInstanceName(lu.cfg, name) for name in instances]
595
  else:
596 597
    wanted = utils.NiceSort(lu.cfg.GetInstanceList())
  return wanted
598 599


600 601
def _GetUpdatedParams(old_params, update_dict,
                      use_default=True, use_none=False):
602 603 604 605 606 607 608 609
  """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
610 611 612 613 614 615
  @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
616 617 618 619 620 621
  @rtype: dict
  @return: the new parameter dictionary

  """
  params_copy = copy.deepcopy(old_params)
  for key, val in update_dict.iteritems():
622 623
    if ((use_default and val == constants.VALUE_DEFAULT) or
        (use_none and val is None)):
624 625 626 627 628 629 630 631 632
      try:
        del params_copy[key]
      except KeyError:
        pass
    else:
      params_copy[key] = val
  return params_copy


633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658
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

  if should_release:
    retain = []
    release = []

    # Determine which locks to release
659
    for name in lu.glm.list_owned(level):
660 661 662 663 664
      if should_release(name):
        release.append(name)
      else:
        retain.append(name)

665
    assert len(lu.glm.list_owned(level)) == (len(retain) + len(release))
666 667

    # Release just some locks
668
    lu.glm.release(level, names=release)
669

670
    assert frozenset(lu.glm.list_owned(level)) == frozenset(retain)
671 672
  else:
    # Release everything
673
    lu.glm.release(level)
674

675
    assert not lu.glm.is_owned(level), "No locks should be owned"
676 677


678 679 680 681 682 683 684 685 686 687 688 689
def _RunPostHook(lu, node_name):
  """Runs the post-hook for an opcode on a single node.

  """
  hm = lu.proc.hmclass(lu.rpc.call_hooks_runner, lu)
  try:
    hm.RunPhase(constants.HOOKS_PHASE_POST, nodes=[node_name])
  except:
    # pylint: disable-msg=W0702
    lu.LogWarning("Errors occurred running hooks on %s" % node_name)


690
def _CheckOutputFields(static, dynamic, selected):
691 692
  """Checks whether all selected fields are valid.

Iustin Pop's avatar
Iustin Pop committed
693
  @type static: L{utils.FieldSet}
Iustin Pop's avatar
Iustin Pop committed
694
  @param static: static fields set
Iustin Pop's avatar
Iustin Pop committed
695
  @type dynamic: L{utils.FieldSet}
Iustin Pop's avatar
Iustin Pop committed
696
  @param dynamic: dynamic fields set
697 698

  """
Iustin Pop's avatar
Iustin Pop committed
699
  f = utils.FieldSet()
Iustin Pop's avatar
Iustin Pop committed
700 701
  f.Extend(static)
  f.Extend(dynamic)
702

Iustin Pop's avatar
Iustin Pop committed
703 704
  delta = f.NonMatching(selected)
  if delta:
705
    raise errors.OpPrereqError("Unknown output fields selected: %s"
706
                               % ",".join(delta), errors.ECODE_INVAL)
707 708


709 710 711 712 713 714 715 716 717 718 719
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"
720
           " cluster level: %s" % utils.CommaJoin(used_globals))
721 722 723
    raise errors.OpPrereqError(msg, errors.ECODE_INVAL)


724
def _CheckNodeOnline(lu, node, msg=None):
725 726 727 728
  """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
729
  @param msg: if passed, should be a message to replace the default one
730
  @raise errors.OpPrereqError: if the node is offline
731 732

  """
733 734
  if msg is None:
    msg = "Can't use offline node"
735
  if lu.cfg.GetNodeInfo(node).offline:
736
    raise errors.OpPrereqError("%s: %s" % (msg, node), errors.ECODE_STATE)
737 738


739 740 741 742 743 744 745 746 747
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:
748
    raise errors.OpPrereqError("Can't use drained node %s" % node,
749 750 751 752 753 754 755 756 757 758 759 760 761 762
                               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)
763 764


Iustin Pop's avatar
Iustin Pop committed
765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782
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)


783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809
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)


810 811 812 813 814 815 816
def _GetClusterDomainSecret():
  """Reads the cluster domain secret.

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

817

818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833
def _CheckInstanceDown(lu, instance, reason):
  """Ensure that an instance is not running."""
  if instance.admin_up:
    raise errors.OpPrereqError("Instance %s is marked to be up, %s" %
                               (instance.name, reason), errors.ECODE_STATE)

  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)

  if instance.name in ins_l.payload:
    raise errors.OpPrereqError("Instance %s is running, %s" %
                               (instance.name, reason), errors.ECODE_STATE)


834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860
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")


861
def _BuildInstanceHookEnv(name, primary_node, secondary_nodes, os_type, status,
862
                          memory, vcpus, nics, disk_template, disks,
Michael Hanselmann's avatar
Michael Hanselmann committed
863
                          bep, hvp, hypervisor_name):
864 865 866 867 868 869 870 871 872 873 874 875
  """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
876 877
  @type status: boolean
  @param status: the should_run status of the instance
878 879 880 881 882
  @type memory: string
  @param memory: the memory size of the instance
  @type vcpus: string
  @param vcpus: the count of VCPUs the instance has
  @type nics: list
883 884
  @param nics: list of tuples (ip, mac, mode, link) representing
      the NICs the instance has
Iustin Pop's avatar
Iustin Pop committed
885
  @type disk_template: string
Michael Hanselmann's avatar
Michael Hanselmann committed
886
  @param disk_template: the disk template of the instance
Iustin Pop's avatar
Iustin Pop committed
887 888
  @type disks: list
  @param disks: the list of (size, mode) pairs
889 890 891 892
  @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
893 894
  @type hypervisor_name: string
  @param hypervisor_name: the hypervisor for the instance
895 896
  @rtype: dict
  @return: the hook environment for this instance
897

898
  """
899 900 901 902
  if status:
    str_status = "up"
  else:
    str_status = "down"
903
  env = {
904
    "OP_TARGET": name,
905 906 907
    "INSTANCE_NAME": name,
    "INSTANCE_PRIMARY": primary_node,
    "INSTANCE_SECONDARIES": " ".join(secondary_nodes),
908
    "INSTANCE_OS_TYPE": os_type,
909
    "INSTANCE_STATUS": str_status,
910 911
    "INSTANCE_MEMORY": memory,
    "INSTANCE_VCPUS": vcpus,
Iustin Pop's avatar
Iustin Pop committed
912
    "INSTANCE_DISK_TEMPLATE": disk_template,
Michael Hanselmann's avatar
Michael Hanselmann committed
913
    "INSTANCE_HYPERVISOR": hypervisor_name,
914 915 916 917
  }

  if nics:
    nic_count = len(nics)
918
    for idx, (ip, mac, mode, link) in enumerate(nics):
919 920 921
      if ip is None:
        ip = ""
      env["INSTANCE_NIC%d_IP" % idx] = ip
Iustin Pop's avatar
Iustin Pop committed
922
      env["INSTANCE_NIC%d_MAC" % idx] = mac
923 924 925 926
      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
927 928 929 930 931
  else:
    nic_count = 0

  env["INSTANCE_NIC_COUNT"] = nic_count

Iustin Pop's avatar
Iustin Pop committed
932 933 934 935 936 937 938 939 940 941
  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

942 943 944 945
  for source, kind in [(bep, "BE"), (hvp, "HV")]:
    for key, value in source.items():
      env["INSTANCE_%s_%s" % (kind, key)] = value

946 947
  return env

948

949
def _NICListToTuple(lu, nics):
950 951
  """Build a list of nic information tuples.

952
  This list is suitable to be passed to _BuildInstanceHookEnv or as a return
953
  value in LUInstanceQueryData.
954 955 956 957 958 959 960 961

  @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 = []
962
  cluster = lu.cfg.GetClusterInfo()
963 964 965
  for nic in nics:
    ip = nic.ip
    mac = nic.mac
966
    filled_params = cluster.SimpleFillNIC(nic.nicparams)
967 968 969 970
    mode = filled_params[constants.NIC_MODE]
    link = filled_params[constants.NIC_LINK]
    hooks_nics.append((ip, mac, mode, link))
  return hooks_nics
971

972

Iustin Pop's avatar
Iustin Pop committed
973
def _BuildInstanceHookEnvByObject(lu, instance, override=None):
974 975
  """Builds instance related env variables for hooks from an object.

976 977 978 979 980 981 982 983 984 985 986
  @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

987
  """
988 989 990
  cluster = lu.cfg.GetClusterInfo()
  bep = cluster.FillBE(instance)
  hvp = cluster.FillHV(instance)
991 992 993 994
  args = {
    'name': instance.name,
    'primary_node': instance.primary_node,
    'secondary_nodes': instance.secondary_nodes,
995
    'os_type': instance.os,
996
    'status': instance.admin_up,
Iustin Pop's avatar
Iustin Pop committed
997 998
    'memory': bep[constants.BE_MEMORY],
    'vcpus': bep[constants.BE_VCPUS],
999
    'nics': _NICListToTuple(lu, instance.nics),
Iustin Pop's avatar
Iustin Pop committed
1000 1001
    'disk_template': instance.disk_template,
    'disks': [(disk.size, disk.mode) for disk in instance.disks],
1002 1003
    'bep': bep,
    'hvp': hvp,
1004
    'hypervisor_name': instance.hypervisor,
1005 1006 1007
  }
  if override:
    args.update(override)
Iustin Pop's avatar
Iustin Pop committed
1008
  return _BuildInstanceHookEnv(**args) # pylint: disable-msg=W0142
1009 1010


Guido Trotter's avatar
Guido Trotter committed
1011
def _AdjustCandidatePool(lu, exceptions):
1012 1013 1014
  """Adjust the candidate pool after node operations.

  """
Guido Trotter's avatar
Guido Trotter committed
1015
  mod_list = lu.cfg.MaintainCandidatePool(exceptions)
1016 1017
  if mod_list:
    lu.LogInfo("Promoted nodes to master candidate role: %s",
1018
               utils.CommaJoin(node.name for node in mod_list))
1019 1020
    for name in mod_list:
      lu.context.ReaddNode(name)
Guido Trotter's avatar
Guido Trotter committed
1021
  mc_now, mc_max, _ = lu.cfg.GetMasterCandidateStats(exceptions)
1022 1023 1024 1025 1026
  if mc_now > mc_max:
    lu.LogInfo("Note: more nodes are candidates (%d) than desired (%d)" %
               (mc_now, mc_max))


1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037
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


1038
def _CheckNicsBridgesExist(lu, target_nics, target_node):
1039 1040 1041
  """Check that the brigdes needed by a list of nics exist.

  """
1042 1043
  cluster = lu.cfg.GetClusterInfo()
  paramslist = [cluster.SimpleFillNIC(nic.nicparams) for nic in target_nics]
1044 1045 1046 1047
  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)
1048
    result.Raise("Error checking bridges on destination node '%s'" %
1049
                 target_node, prereq=True, ecode=errors.ECODE_ENVIRON)
1050 1051 1052


def _CheckInstanceBridgesExist(lu, instance, node=None):
1053 1054 1055
  """Check that the brigdes needed by an instance exist.

  """
1056
  if node is None:
Iustin Pop's avatar
Iustin Pop committed
1057
    node = instance.primary_node
1058
  _CheckNicsBridgesExist(lu, instance.nics, node)
1059 1060


Iustin Pop's avatar
Iustin Pop committed
1061
def _CheckOSVariant(os_obj, name):
Guido Trotter's avatar
Guido Trotter committed
1062 1063
  """Check whether an OS name conforms to the os variants specification.

Iustin Pop's avatar
Iustin Pop committed
1064 1065
  @type os_obj: L{objects.OS}
  @param os_obj: OS object to check
Guido Trotter's avatar
Guido Trotter committed
1066 1067 1068 1069
  @type name: string
  @param name: OS name passed by the user, to check for validity

  """
Iustin Pop's avatar
Iustin Pop committed
1070
  if not os_obj.supported_variants:
Guido Trotter's avatar
Guido Trotter committed
1071
    return
1072 1073
  variant = objects.OS.GetVariant(name)
  if not variant:
1074 1075
    raise errors.OpPrereqError("OS name must include a variant",
                               errors.ECODE_INVAL)
Guido Trotter's avatar
Guido Trotter committed
1076

Iustin Pop's avatar
Iustin Pop committed
1077
  if variant not in os_obj.supported_variants:
1078
    raise errors.OpPrereqError("Unsupported OS variant", errors.ECODE_INVAL)
Guido Trotter's avatar
Guido Trotter committed
1079 1080


1081 1082 1083 1084
def _GetNodeInstancesInner(cfg, fn):
  return [i for i in cfg.GetAllInstancesInfo().values() if fn(i)]


1085 1086 1087 1088 1089 1090 1091 1092
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)


1093 1094 1095 1096
def _GetNodePrimaryInstances(cfg, node_name):
  """Returns primary instances on a node.

  """
1097 1098
  return _GetNodeInstancesInner(cfg,
                                lambda inst: node_name == inst.primary_node)