cmdlib.py 412 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
# End types
Iustin Pop's avatar
Iustin Pop committed
78
class LogicalUnit(object):
79
  """Logical Unit base class.
Iustin Pop's avatar
Iustin Pop committed
80 81

  Subclasses must follow these rules:
82
    - implement ExpandNames
83 84
    - implement CheckPrereq (except when tasklets are used)
    - implement Exec (except when tasklets are used)
Iustin Pop's avatar
Iustin Pop committed
85 86
    - implement BuildHooksEnv
    - redefine HPATH and HTYPE
87
    - optionally redefine their run requirements:
88
        REQ_BGL: the LU needs to hold the Big Ganeti Lock exclusively
89 90

  Note that all commands require root permissions.
Iustin Pop's avatar
Iustin Pop committed
91

92 93 94
  @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
95 96 97
  """
  HPATH = None
  HTYPE = None
98
  REQ_BGL = True
Iustin Pop's avatar
Iustin Pop committed
99

Iustin Pop's avatar
Iustin Pop committed
100
  def __init__(self, processor, op, context, rpc):
Iustin Pop's avatar
Iustin Pop committed
101 102
    """Constructor for LogicalUnit.

Michael Hanselmann's avatar
Michael Hanselmann committed
103
    This needs to be overridden in derived classes in order to check op
Iustin Pop's avatar
Iustin Pop committed
104 105 106
    validity.

    """
Iustin Pop's avatar
Iustin Pop committed
107
    self.proc = processor
Iustin Pop's avatar
Iustin Pop committed
108
    self.op = op
Guido Trotter's avatar
Guido Trotter committed
109 110
    self.cfg = context.cfg
    self.context = context
Iustin Pop's avatar
Iustin Pop committed
111
    self.rpc = rpc
112
    # Dicts used to declare locking needs to mcpu
113
    self.needed_locks = None
114
    self.acquired_locks = {}
115
    self.share_locks = dict.fromkeys(locking.LEVELS, 0)
116 117
    self.add_locks = {}
    self.remove_locks = {}
118 119
    # Used to force good behavior when calling helper functions
    self.recalculate_locks = {}
120
    self.__ssh = None
121
    # logging
122
    self.Log = processor.Log # pylint: disable-msg=C0103
Iustin Pop's avatar
Iustin Pop committed
123 124
    self.LogWarning = processor.LogWarning # pylint: disable-msg=C0103
    self.LogInfo = processor.LogInfo # pylint: disable-msg=C0103
125
    self.LogStep = processor.LogStep # pylint: disable-msg=C0103
126 127
    # support for dry-run
    self.dry_run_result = None
128 129 130 131
    # 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
132

133
    # Tasklets
134
    self.tasklets = None
135

136 137
    # Validate opcode parameters and set defaults
    self.op.Validate(True)
138

139
    self.CheckArguments()
Iustin Pop's avatar
Iustin Pop committed
140

141 142 143 144 145
  def __GetSSH(self):
    """Returns the SshRunner object

    """
    if not self.__ssh:
146
      self.__ssh = ssh.SshRunner(self.cfg.GetClusterName())
147 148 149 150
    return self.__ssh

  ssh = property(fget=__GetSSH)

151 152 153 154 155 156 157 158 159
  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
160
      - CheckPrereq is run after we have acquired locks (and possible
161 162 163 164 165 166 167 168
        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

169 170 171 172 173 174
  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
175
    completed). This way locking, hooks, logging, etc. can work correctly.
176 177 178 179

    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:
180 181 182 183 184

      - 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
185

Guido Trotter's avatar
Guido Trotter committed
186 187 188 189
    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.

190 191 192 193
    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.

194 195 196 197 198
    Examples::

      # Acquire all nodes and one instance
      self.needed_locks = {
        locking.LEVEL_NODE: locking.ALL_SET,
199
        locking.LEVEL_INSTANCE: ['instance1.example.com'],
200 201 202
      }
      # Acquire just two nodes
      self.needed_locks = {
203
        locking.LEVEL_NODE: ['node1.example.com', 'node2.example.com'],
204 205 206
      }
      # Acquire no locks
      self.needed_locks = {} # No, you can't leave it to the default value None
207 208 209 210 211 212 213 214 215 216

    """
    # 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
217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234
  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
235 236 237 238 239 240 241 242 243 244 245 246
  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
247
    their canonical form if it hasn't been done by ExpandNames before.
Iustin Pop's avatar
Iustin Pop committed
248 249

    """
250
    if self.tasklets is not None:
251
      for (idx, tl) in enumerate(self.tasklets):
252 253
        logging.debug("Checking prerequisites for tasklet %s/%s",
                      idx + 1, len(self.tasklets))
254 255
        tl.CheckPrereq()
    else:
256
      pass
Iustin Pop's avatar
Iustin Pop committed
257 258 259 260 261 262 263 264 265

  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.

    """
266
    if self.tasklets is not None:
267
      for (idx, tl) in enumerate(self.tasklets):
268
        logging.debug("Executing tasklet %s/%s", idx + 1, len(self.tasklets))
269 270 271
        tl.Exec(feedback_fn)
    else:
      raise NotImplementedError
Iustin Pop's avatar
Iustin Pop committed
272 273 274 275 276 277 278 279 280 281 282 283 284 285 286

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

    This method should return a three-node tuple consisting of: a dict
    containing the environment that will be used for running the
    specific hook for this LU, 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.

    The keys of the dict must not have 'GANETI_' prefixed as this will
    be handled in the hooks runner. Also note additional keys will be
    added by the hooks runner. If the LU doesn't define any
    environment, an empty dict (and not None) should be returned.

287
    No nodes should be returned as an empty list (and not None).
Iustin Pop's avatar
Iustin Pop committed
288 289 290 291 292 293 294

    Note that if the HPATH for a LU class is None, this function will
    not be called.

    """
    raise NotImplementedError

295 296 297 298 299 300 301 302 303
  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.

304 305 306 307 308 309 310 311
    @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
312 313

    """
314 315 316
    # API must be kept, thus we ignore the unused argument and could
    # be a function warnings
    # pylint: disable-msg=W0613,R0201
317 318
    return lu_result

319 320 321 322 323 324 325 326 327 328 329 330 331 332 333
  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"
334 335 336
    self.op.instance_name = _ExpandInstanceName(self.cfg,
                                                self.op.instance_name)
    self.needed_locks[locking.LEVEL_INSTANCE] = self.op.instance_name
337

338
  def _LockInstancesNodes(self, primary_only=False):
339 340 341 342 343 344 345 346 347 348 349 350 351
    """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.

352
    If should be called in DeclareLocks in a way similar to::
353

354 355
      if level == locking.LEVEL_NODE:
        self._LockInstancesNodes()
356

357 358 359
    @type primary_only: boolean
    @param primary_only: only lock primary nodes of locked instances

360 361 362 363 364 365 366 367 368 369
    """
    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 = []
370
    for instance_name in self.acquired_locks[locking.LEVEL_INSTANCE]:
371 372
      instance = self.context.cfg.GetInstanceInfo(instance_name)
      wanted_nodes.append(instance.primary_node)
373 374
      if not primary_only:
        wanted_nodes.extend(instance.secondary_nodes)
375 376 377 378 379

    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)
380 381 382

    del self.recalculate_locks[locking.LEVEL_NODE]

Iustin Pop's avatar
Iustin Pop committed
383

Iustin Pop's avatar
Iustin Pop committed
384
class NoHooksLU(LogicalUnit): # pylint: disable-msg=W0223
Iustin Pop's avatar
Iustin Pop committed
385 386 387 388 389 390 391 392 393
  """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

394 395 396 397 398 399 400 401
  def BuildHooksEnv(self):
    """Empty BuildHooksEnv for NoHooksLu.

    This just raises an error.

    """
    assert False, "BuildHooksEnv called for NoHooksLUs"

Iustin Pop's avatar
Iustin Pop committed
402

403 404 405 406 407 408 409 410 411 412 413 414
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

  """
415 416 417 418 419 420 421
  def __init__(self, lu):
    self.lu = lu

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

422 423 424 425 426 427 428 429 430 431 432 433 434 435
  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.

    """
436
    pass
437 438 439 440 441 442 443 444 445 446 447 448

  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


449 450 451 452 453 454 455
class _QueryBase:
  """Base for query utility classes.

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

456
  def __init__(self, filter_, fields, use_locking):
457 458 459 460 461
    """Initializes this class.

    """
    self.use_locking = use_locking

462 463
    self.query = query.Query(self.FIELDS, fields, filter_=filter_,
                             namefield="name")
464
    self.requested_data = self.query.RequestedData()
465
    self.names = self.query.RequestedNames()
466

467 468 469
    # Sort only if no names were requested
    self.sort_by_name = not self.names

470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498
    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:
      names = lu.acquired_locks[lock_level]
    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
    assert not self.do_locking or lu.acquired_locks[lock_level]

    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

499 500 501 502 503 504 505 506
  def ExpandNames(self, lu):
    """Expand names for this query.

    See L{LogicalUnit.ExpandNames}.

    """
    raise NotImplementedError()

507
  def DeclareLocks(self, lu, level):
508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526
    """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.

    """
527 528
    return query.GetQueryResponse(self.query, self._GetQueryData(lu),
                                  sort_by_name=self.sort_by_name)
529 530 531 532 533

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

    """
534 535
    return self.query.OldStyleQuery(self._GetQueryData(lu),
                                    sort_by_name=self.sort_by_name)
536 537


538
def _GetWantedNodes(lu, nodes):
539
  """Returns list of checked and expanded node names.
540

541 542 543 544 545 546
  @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
547
  @raise errors.ProgrammerError: if the nodes parameter is wrong type
548 549

  """
550 551
  if nodes:
    return [_ExpandNodeName(lu.cfg, name) for name in nodes]
552

553
  return utils.NiceSort(lu.cfg.GetNodeList())
554 555 556


def _GetWantedInstances(lu, instances):
557
  """Returns list of checked and expanded instance names.
558

559 560 561 562 563 564 565 566
  @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
567 568 569

  """
  if instances:
570
    wanted = [_ExpandInstanceName(lu.cfg, name) for name in instances]
571
  else:
572 573
    wanted = utils.NiceSort(lu.cfg.GetInstanceList())
  return wanted
574 575


576 577
def _GetUpdatedParams(old_params, update_dict,
                      use_default=True, use_none=False):
578 579 580 581 582 583 584 585
  """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
586 587 588 589 590 591
  @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
592 593 594 595 596 597
  @rtype: dict
  @return: the new parameter dictionary

  """
  params_copy = copy.deepcopy(old_params)
  for key, val in update_dict.iteritems():
598 599
    if ((use_default and val == constants.VALUE_DEFAULT) or
        (use_none and val is None)):
600 601 602 603 604 605 606 607 608
      try:
        del params_copy[key]
      except KeyError:
        pass
    else:
      params_copy[key] = val
  return params_copy


609
def _CheckOutputFields(static, dynamic, selected):
610 611
  """Checks whether all selected fields are valid.

Iustin Pop's avatar
Iustin Pop committed
612
  @type static: L{utils.FieldSet}
Iustin Pop's avatar
Iustin Pop committed
613
  @param static: static fields set
Iustin Pop's avatar
Iustin Pop committed
614
  @type dynamic: L{utils.FieldSet}
Iustin Pop's avatar
Iustin Pop committed
615
  @param dynamic: dynamic fields set
616 617

  """
Iustin Pop's avatar
Iustin Pop committed
618
  f = utils.FieldSet()
Iustin Pop's avatar
Iustin Pop committed
619 620
  f.Extend(static)
  f.Extend(dynamic)
621

Iustin Pop's avatar
Iustin Pop committed
622 623
  delta = f.NonMatching(selected)
  if delta:
624
    raise errors.OpPrereqError("Unknown output fields selected: %s"
625
                               % ",".join(delta), errors.ECODE_INVAL)
626 627


628 629 630 631 632 633 634 635 636 637 638
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"
639
           " cluster level: %s" % utils.CommaJoin(used_globals))
640 641 642
    raise errors.OpPrereqError(msg, errors.ECODE_INVAL)


643
def _CheckNodeOnline(lu, node, msg=None):
644 645 646 647
  """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
648
  @param msg: if passed, should be a message to replace the default one
649
  @raise errors.OpPrereqError: if the node is offline
650 651

  """
652 653
  if msg is None:
    msg = "Can't use offline node"
654
  if lu.cfg.GetNodeInfo(node).offline:
655
    raise errors.OpPrereqError("%s: %s" % (msg, node), errors.ECODE_STATE)
656 657


658 659 660 661 662 663 664 665 666
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:
667
    raise errors.OpPrereqError("Can't use drained node %s" % node,
668 669 670 671 672 673 674 675 676 677 678 679 680 681
                               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)
682 683


Iustin Pop's avatar
Iustin Pop committed
684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701
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)


702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728
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)


729 730 731 732 733 734 735
def _GetClusterDomainSecret():
  """Reads the cluster domain secret.

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

736

737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752
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)


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
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")


780
def _BuildInstanceHookEnv(name, primary_node, secondary_nodes, os_type, status,
781
                          memory, vcpus, nics, disk_template, disks,
Michael Hanselmann's avatar
Michael Hanselmann committed
782
                          bep, hvp, hypervisor_name):
783 784 785 786 787 788 789 790 791 792 793 794
  """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
795 796
  @type status: boolean
  @param status: the should_run status of the instance
797 798 799 800 801
  @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
802 803
  @param nics: list of tuples (ip, mac, mode, link) representing
      the NICs the instance has
Iustin Pop's avatar
Iustin Pop committed
804
  @type disk_template: string
Michael Hanselmann's avatar
Michael Hanselmann committed
805
  @param disk_template: the disk template of the instance
Iustin Pop's avatar
Iustin Pop committed
806 807
  @type disks: list
  @param disks: the list of (size, mode) pairs
808 809 810 811
  @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
812 813
  @type hypervisor_name: string
  @param hypervisor_name: the hypervisor for the instance
814 815
  @rtype: dict
  @return: the hook environment for this instance
816

817
  """
818 819 820 821
  if status:
    str_status = "up"
  else:
    str_status = "down"
822
  env = {
823
    "OP_TARGET": name,
824 825 826
    "INSTANCE_NAME": name,
    "INSTANCE_PRIMARY": primary_node,
    "INSTANCE_SECONDARIES": " ".join(secondary_nodes),
827
    "INSTANCE_OS_TYPE": os_type,
828
    "INSTANCE_STATUS": str_status,
829 830
    "INSTANCE_MEMORY": memory,
    "INSTANCE_VCPUS": vcpus,
Iustin Pop's avatar
Iustin Pop committed
831
    "INSTANCE_DISK_TEMPLATE": disk_template,
Michael Hanselmann's avatar
Michael Hanselmann committed
832
    "INSTANCE_HYPERVISOR": hypervisor_name,
833 834 835 836
  }

  if nics:
    nic_count = len(nics)
837
    for idx, (ip, mac, mode, link) in enumerate(nics):
838 839 840
      if ip is None:
        ip = ""
      env["INSTANCE_NIC%d_IP" % idx] = ip
Iustin Pop's avatar
Iustin Pop committed
841
      env["INSTANCE_NIC%d_MAC" % idx] = mac
842 843 844 845
      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
846 847 848 849 850
  else:
    nic_count = 0

  env["INSTANCE_NIC_COUNT"] = nic_count

Iustin Pop's avatar
Iustin Pop committed
851 852 853 854 855 856 857 858 859 860
  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

861 862 863 864
  for source, kind in [(bep, "BE"), (hvp, "HV")]:
    for key, value in source.items():
      env["INSTANCE_%s_%s" % (kind, key)] = value

865 866
  return env

867

868
def _NICListToTuple(lu, nics):
869 870
  """Build a list of nic information tuples.

871
  This list is suitable to be passed to _BuildInstanceHookEnv or as a return
872
  value in LUInstanceQueryData.
873 874 875 876 877 878 879 880

  @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 = []
881
  cluster = lu.cfg.GetClusterInfo()
882 883 884
  for nic in nics:
    ip = nic.ip
    mac = nic.mac
885
    filled_params = cluster.SimpleFillNIC(nic.nicparams)
886 887 888 889
    mode = filled_params[constants.NIC_MODE]
    link = filled_params[constants.NIC_LINK]
    hooks_nics.append((ip, mac, mode, link))
  return hooks_nics
890

891

Iustin Pop's avatar
Iustin Pop committed
892
def _BuildInstanceHookEnvByObject(lu, instance, override=None):
893 894
  """Builds instance related env variables for hooks from an object.

895 896 897 898 899 900 901 902 903 904 905
  @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

906
  """
907 908 909
  cluster = lu.cfg.GetClusterInfo()
  bep = cluster.FillBE(instance)
  hvp = cluster.FillHV(instance)
910 911 912 913
  args = {
    'name': instance.name,
    'primary_node': instance.primary_node,
    'secondary_nodes': instance.secondary_nodes,
914
    'os_type': instance.os,
915
    'status': instance.admin_up,
Iustin Pop's avatar
Iustin Pop committed
916 917
    'memory': bep[constants.BE_MEMORY],
    'vcpus': bep[constants.BE_VCPUS],
918
    'nics': _NICListToTuple(lu, instance.nics),
Iustin Pop's avatar
Iustin Pop committed
919 920
    'disk_template': instance.disk_template,
    'disks': [(disk.size, disk.mode) for disk in instance.disks],
921 922
    'bep': bep,
    'hvp': hvp,
923
    'hypervisor_name': instance.hypervisor,
924 925 926
  }
  if override:
    args.update(override)
Iustin Pop's avatar
Iustin Pop committed
927
  return _BuildInstanceHookEnv(**args) # pylint: disable-msg=W0142
928 929


Guido Trotter's avatar
Guido Trotter committed
930
def _AdjustCandidatePool(lu, exceptions):
931 932 933
  """Adjust the candidate pool after node operations.

  """
Guido Trotter's avatar
Guido Trotter committed
934
  mod_list = lu.cfg.MaintainCandidatePool(exceptions)
935 936
  if mod_list:
    lu.LogInfo("Promoted nodes to master candidate role: %s",
937
               utils.CommaJoin(node.name for node in mod_list))
938 939
    for name in mod_list:
      lu.context.ReaddNode(name)
Guido Trotter's avatar
Guido Trotter committed
940
  mc_now, mc_max, _ = lu.cfg.GetMasterCandidateStats(exceptions)
941 942 943 944 945
  if mc_now > mc_max:
    lu.LogInfo("Note: more nodes are candidates (%d) than desired (%d)" %
               (mc_now, mc_max))


946 947 948 949 950 951 952 953 954 955 956
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


957
def _CheckNicsBridgesExist(lu, target_nics, target_node):
958 959 960
  """Check that the brigdes needed by a list of nics exist.

  """
961 962
  cluster = lu.cfg.GetClusterInfo()
  paramslist = [cluster.SimpleFillNIC(nic.nicparams) for nic in target_nics]
963 964 965 966
  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)
967
    result.Raise("Error checking bridges on destination node '%s'" %
968
                 target_node, prereq=True, ecode=errors.ECODE_ENVIRON)
969 970 971


def _CheckInstanceBridgesExist(lu, instance, node=None):
972 973 974
  """Check that the brigdes needed by an instance exist.

  """
975
  if node is None:
Iustin Pop's avatar
Iustin Pop committed
976
    node = instance.primary_node
977
  _CheckNicsBridgesExist(lu, instance.nics, node)
978 979


Iustin Pop's avatar
Iustin Pop committed
980
def _CheckOSVariant(os_obj, name):
Guido Trotter's avatar
Guido Trotter committed
981 982
  """Check whether an OS name conforms to the os variants specification.

Iustin Pop's avatar
Iustin Pop committed
983 984
  @type os_obj: L{objects.OS}
  @param os_obj: OS object to check
Guido Trotter's avatar
Guido Trotter committed
985 986 987 988
  @type name: string
  @param name: OS name passed by the user, to check for validity

  """
Iustin Pop's avatar
Iustin Pop committed
989
  if not os_obj.supported_variants:
Guido Trotter's avatar
Guido Trotter committed
990
    return
991 992
  variant = objects.OS.GetVariant(name)
  if not variant:
993 994
    raise errors.OpPrereqError("OS name must include a variant",
                               errors.ECODE_INVAL)
Guido Trotter's avatar
Guido Trotter committed
995

Iustin Pop's avatar
Iustin Pop committed
996
  if variant not in os_obj.supported_variants:
997
    raise errors.OpPrereqError("Unsupported OS variant", errors.ECODE_INVAL)
Guido Trotter's avatar
Guido Trotter committed
998 999


1000 1001 1002 1003
def _GetNodeInstancesInner(cfg, fn):
  return [i for i in cfg.GetAllInstancesInfo().values() if fn(i)]


1004 1005 1006 1007 1008 1009 1010 1011
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)


1012 1013 1014 1015
def _GetNodePrimaryInstances(cfg, node_name):
  """Returns primary instances on a node.

  """
1016 1017
  return _GetNodeInstancesInner(cfg,
                                lambda inst: node_name == inst.primary_node)
1018 1019


1020 1021 1022 1023
def _GetNodeSecondaryInstances(cfg, node_name):
  """Returns secondary instances on a node.

  """
1024 1025
  return _GetNodeInstancesInner(cfg,
                                lambda inst: node_name in inst.secondary_nodes)
1026 1027


1028 1029 1030 1031 1032 1033
def _GetStorageTypeArgs(cfg, storage_type):
  """Returns the arguments for a storage type.

  """
  # Special case for file storage
  if storage_type == constants.ST_FILE:
1034
    # storage.FileStorage wants a list of storage directories
1035
    return [[cfg.GetFileStorageDir(), cfg.GetSharedFileStorageDir()]]
1036 1037 1038 1039

  return []


1040 1041 1042 1043 1044 1045 1046 1047
def _FindFaultyInstanceDisks(cfg, rpc, instance, node_name, prereq):
  faulty = []

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

  result = rpc.call_blockdev_getmirrorstatus(node_name, instance.disks)
  result.Raise("Failed to get disk status from node %s" % node_name,
1048
               prereq=prereq, ecode=errors.ECODE_ENVIRON)
1049 1050 1051 1052 1053 1054 1055 1056

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

  return faulty


1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088
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:
    raise errors.OpPrereqError("Do not specify both, iallocator and node.",
                               errors.ECODE_INVAL)
  elif node is None and iallocator is None:
    default_iallocator = lu.cfg.GetDefaultIAllocator()
    if default_iallocator:
      setattr(lu.op, iallocator_slot, default_iallocator)
    else:
      raise errors.OpPrereqError("No iallocator or node given and no"
                                 " cluster-wide default iallocator found."
                                 " Please specify either an iallocator or a"
                                 " node, or set a cluster-wide default"
                                 " iallocator.")


1089
class LUClusterPostInit(LogicalUnit):
1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110
  """Logical unit for running hooks after cluster initialization.

  """
  HPATH = "cluster-init"
  HTYPE = constants.HTYPE_CLUSTER

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

    """
    env = {"OP_TARGET": self.cfg.GetClusterName()}
    mn = self.cfg.GetMasterNode()
    return env, [], [mn]

  def Exec(self, feedback_fn):
    """Nothing to do.

    """
    return True


1111
class LUClusterDestroy(LogicalUnit):
Iustin Pop's avatar
Iustin Pop committed
1112 1113 1114
  """Logical unit for destroying the cluster.

  """
1115 1116
  HPATH = "cluster-destroy"
  HTYPE = constants.HTYPE_CLUSTER
Iustin Pop's avatar
Iustin Pop committed
1117

1118 1119 1120