backend.py 69.6 KB
Newer Older
Iustin Pop's avatar
Iustin Pop committed
1
#
Iustin Pop's avatar
Iustin Pop committed
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
#

# Copyright (C) 2006, 2007 Google Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.


"""Functions used by the node daemon"""


import os
import os.path
import shutil
import time
import stat
import errno
import re
import subprocess
33
import random
34
import logging
35
import tempfile
36
37
import zlib
import base64
Iustin Pop's avatar
Iustin Pop committed
38
39
40
41
42
43
44
45

from ganeti import errors
from ganeti import utils
from ganeti import ssh
from ganeti import hypervisor
from ganeti import constants
from ganeti import bdev
from ganeti import objects
46
from ganeti import ssconf
Iustin Pop's avatar
Iustin Pop committed
47
48


Michael Hanselmann's avatar
Michael Hanselmann committed
49
def _GetConfig():
Iustin Pop's avatar
Iustin Pop committed
50
  """Simple wrapper to return a SimpleStore.
Iustin Pop's avatar
Iustin Pop committed
51

Iustin Pop's avatar
Iustin Pop committed
52
53
  @rtype: L{ssconf.SimpleStore}
  @return: a SimpleStore instance
Iustin Pop's avatar
Iustin Pop committed
54
55

  """
Iustin Pop's avatar
Iustin Pop committed
56
  return ssconf.SimpleStore()
Michael Hanselmann's avatar
Michael Hanselmann committed
57
58


59
def _GetSshRunner(cluster_name):
Iustin Pop's avatar
Iustin Pop committed
60
61
62
63
64
65
66
67
68
  """Simple wrapper to return an SshRunner.

  @type cluster_name: str
  @param cluster_name: the cluster name, which is needed
      by the SshRunner constructor
  @rtype: L{ssh.SshRunner}
  @return: an SshRunner instance

  """
69
  return ssh.SshRunner(cluster_name)
70
71


72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
def _Decompress(data):
  """Unpacks data compressed by the RPC client.

  @type data: list or tuple
  @param data: Data sent by RPC client
  @rtype: str
  @return: Decompressed data

  """
  assert len(data) == 2
  (encoding, content) = data
  if encoding == constants.RPC_ENCODING_NONE:
    return content
  elif encoding == constants.RPC_ENCODING_ZLIB_BASE64:
    return zlib.decompress(base64.b64decode(content))
  else:
    raise AssertionError("Unknown data encoding")


91
92
93
def _CleanDirectory(path, exclude=[]):
  """Removes all regular files in a directory.

Iustin Pop's avatar
Iustin Pop committed
94
95
  @type path: str
  @param path: the directory to clean
96
  @type exclude: list
Iustin Pop's avatar
Iustin Pop committed
97
98
99
  @param exclude: list of files to be excluded, defaults
      to the empty list
  @rtype: None
100
101

  """
102
103
  if not os.path.isdir(path):
    return
104
105
106
107

  # Normalize excluded paths
  exclude = [os.path.normpath(i) for i in exclude]

108
  for rel_name in utils.ListVisibleFiles(path):
109
110
111
    full_name = os.path.normpath(os.path.join(path, rel_name))
    if full_name in exclude:
      continue
112
113
114
115
    if os.path.isfile(full_name) and not os.path.islink(full_name):
      utils.RemoveFile(full_name)


116
def JobQueuePurge():
Iustin Pop's avatar
Iustin Pop committed
117
118
119
  """Removes job queue files and archived jobs.

  @rtype: None
120
121

  """
122
  _CleanDirectory(constants.QUEUE_DIR, exclude=[constants.JOB_QUEUE_LOCK_FILE])
123
124
125
  _CleanDirectory(constants.JOB_QUEUE_ARCHIVE_DIR)


126
127
128
129
130
131
132
def GetMasterInfo():
  """Returns master information.

  This is an utility function to compute master information, either
  for consumption here or from the node daemon.

  @rtype: tuple
Iustin Pop's avatar
Iustin Pop committed
133
134
  @return: (master_netdev, master_ip, master_name) if we have a good
      configuration, otherwise (None, None, None)
135
136
137

  """
  try:
Michael Hanselmann's avatar
Michael Hanselmann committed
138
139
140
141
    cfg = _GetConfig()
    master_netdev = cfg.GetMasterNetdev()
    master_ip = cfg.GetMasterIP()
    master_node = cfg.GetMasterNode()
142
143
  except errors.ConfigurationError, err:
    logging.exception("Cluster configuration incomplete")
Iustin Pop's avatar
Iustin Pop committed
144
    return (None, None, None)
145
  return (master_netdev, master_ip, master_node)
146
147


148
def StartMaster(start_daemons):
Iustin Pop's avatar
Iustin Pop committed
149
150
  """Activate local node as master node.

151
  The function will always try activate the IP address of the master
Iustin Pop's avatar
Iustin Pop committed
152
153
154
155
156
157
158
  (unless someone else has it). It will also start the master daemons,
  based on the start_daemons parameter.

  @type start_daemons: boolean
  @param start_daemons: whther to also start the master
      daemons (ganeti-masterd and ganeti-rapi)
  @rtype: None
Iustin Pop's avatar
Iustin Pop committed
159
160

  """
161
  ok = True
162
  master_netdev, master_ip, _ = GetMasterInfo()
163
  if not master_netdev:
Iustin Pop's avatar
Iustin Pop committed
164
165
    return False

166
  if utils.TcpPing(master_ip, constants.DEFAULT_NODED_PORT):
167
    if utils.OwnIpAddress(master_ip):
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
      # we already have the ip:
      logging.debug("Already started")
    else:
      logging.error("Someone else has the master ip, not activating")
      ok = False
  else:
    result = utils.RunCmd(["ip", "address", "add", "%s/32" % master_ip,
                           "dev", master_netdev, "label",
                           "%s:0" % master_netdev])
    if result.failed:
      logging.error("Can't activate master IP: %s", result.output)
      ok = False

    result = utils.RunCmd(["arping", "-q", "-U", "-c 3", "-I", master_netdev,
                           "-s", master_ip, master_ip])
    # we'll ignore the exit code of arping

  # and now start the master and rapi daemons
  if start_daemons:
    for daemon in 'ganeti-masterd', 'ganeti-rapi':
      result = utils.RunCmd([daemon])
      if result.failed:
        logging.error("Can't start daemon %s: %s", daemon, result.output)
        ok = False
  return ok
Iustin Pop's avatar
Iustin Pop committed
193
194


195
def StopMaster(stop_daemons):
Iustin Pop's avatar
Iustin Pop committed
196
197
  """Deactivate this node as master.

198
  The function will always try to deactivate the IP address of the
Iustin Pop's avatar
Iustin Pop committed
199
200
201
202
203
204
205
  master. It will also stop the master daemons depending on the
  stop_daemons parameter.

  @type stop_daemons: boolean
  @param stop_daemons: whether to also stop the master daemons
      (ganeti-masterd and ganeti-rapi)
  @rtype: None
Iustin Pop's avatar
Iustin Pop committed
206
207

  """
208
  master_netdev, master_ip, _ = GetMasterInfo()
209
210
  if not master_netdev:
    return False
Iustin Pop's avatar
Iustin Pop committed
211

212
213
  result = utils.RunCmd(["ip", "address", "del", "%s/32" % master_ip,
                         "dev", master_netdev])
Iustin Pop's avatar
Iustin Pop committed
214
  if result.failed:
215
    logging.error("Can't remove the master IP, error: %s", result.output)
216
217
218
219
220
221
    # but otherwise ignore the failure

  if stop_daemons:
    # stop/kill the rapi and the master daemon
    for daemon in constants.RAPI_PID, constants.MASTERD_PID:
      utils.KillProcess(utils.ReadPidFile(utils.DaemonPidFileName(daemon)))
Iustin Pop's avatar
Iustin Pop committed
222
223
224
225

  return True


Iustin Pop's avatar
Iustin Pop committed
226
def AddNode(dsa, dsapub, rsa, rsapub, sshkey, sshpub):
227
  """Joins this node to the cluster.
Iustin Pop's avatar
Iustin Pop committed
228

229
230
231
232
  This does the following:
      - updates the hostkeys of the machine (rsa and dsa)
      - adds the ssh private key to the user
      - adds the ssh public key to the users' authorized_keys file
Iustin Pop's avatar
Iustin Pop committed
233

Iustin Pop's avatar
Iustin Pop committed
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
  @type dsa: str
  @param dsa: the DSA private key to write
  @type dsapub: str
  @param dsapub: the DSA public key to write
  @type rsa: str
  @param rsa: the RSA private key to write
  @type rsapub: str
  @param rsapub: the RSA public key to write
  @type sshkey: str
  @param sshkey: the SSH private key to write
  @type sshpub: str
  @param sshpub: the SSH public key to write
  @rtype: boolean
  @return: the success of the operation

249
  """
250
251
252
253
  sshd_keys =  [(constants.SSH_HOST_RSA_PRIV, rsa, 0600),
                (constants.SSH_HOST_RSA_PUB, rsapub, 0644),
                (constants.SSH_HOST_DSA_PRIV, dsa, 0600),
                (constants.SSH_HOST_DSA_PUB, dsapub, 0644)]
254
  for name, content, mode in sshd_keys:
255
    utils.WriteFile(name, data=content, mode=mode)
Iustin Pop's avatar
Iustin Pop committed
256

257
258
259
260
  try:
    priv_key, pub_key, auth_keys = ssh.GetUserFiles(constants.GANETI_RUNAS,
                                                    mkdir=True)
  except errors.OpExecError, err:
261
    logging.exception("Error while processing user ssh files")
262
    return False
Iustin Pop's avatar
Iustin Pop committed
263

264
265
  for name, content in [(priv_key, sshkey), (pub_key, sshpub)]:
    utils.WriteFile(name, data=content, mode=0600)
Iustin Pop's avatar
Iustin Pop committed
266

267
  utils.AddAuthorizedKey(auth_keys, sshpub)
Iustin Pop's avatar
Iustin Pop committed
268

269
  utils.RunCmd([constants.SSH_INITD_SCRIPT, "restart"])
Iustin Pop's avatar
Iustin Pop committed
270
271
272
273
274

  return True


def LeaveCluster():
Iustin Pop's avatar
Iustin Pop committed
275
276
277
278
279
280
281
282
  """Cleans up and remove the current node.

  This function cleans up and prepares the current node to be removed
  from the cluster.

  If processing is successful, then it raises an
  L{errors.GanetiQuitException} which is used as a special case to
  shutdown the node daemon.
Iustin Pop's avatar
Iustin Pop committed
283
284

  """
285
  _CleanDirectory(constants.DATA_DIR)
286
  JobQueuePurge()
287

288
289
  try:
    priv_key, pub_key, auth_keys = ssh.GetUserFiles(constants.GANETI_RUNAS)
290
291
  except errors.OpExecError:
    logging.exception("Error while processing ssh files")
292
293
    return

294
  f = open(pub_key, 'r')
Iustin Pop's avatar
Iustin Pop committed
295
  try:
296
    utils.RemoveAuthorizedKey(auth_keys, f.read(8192))
Iustin Pop's avatar
Iustin Pop committed
297
298
299
  finally:
    f.close()

300
301
  utils.RemoveFile(priv_key)
  utils.RemoveFile(pub_key)
Iustin Pop's avatar
Iustin Pop committed
302

303
304
305
  # Return a reassuring string to the caller, and quit
  raise errors.QuitGanetiException(False, 'Shutdown scheduled')

Iustin Pop's avatar
Iustin Pop committed
306

307
def GetNodeInfo(vgname, hypervisor_type):
Alexander Schreiber's avatar
Alexander Schreiber committed
308
  """Gives back a hash with different informations about the node.
Iustin Pop's avatar
Iustin Pop committed
309

310
311
312
313
314
315
316
317
318
319
320
321
  @type vgname: C{string}
  @param vgname: the name of the volume group to ask for disk space information
  @type hypervisor_type: C{str}
  @param hypervisor_type: the name of the hypervisor to ask for
      memory information
  @rtype: C{dict}
  @return: dictionary with the following keys:
      - vg_size is the size of the configured volume group in MiB
      - vg_free is the free size of the volume group in MiB
      - memory_dom0 is the memory allocated for domain0 in MiB
      - memory_free is the currently available (free) ram in MiB
      - memory_total is the total number of ram in MiB
Iustin Pop's avatar
Iustin Pop committed
322

323
  """
Iustin Pop's avatar
Iustin Pop committed
324
325
326
327
328
  outputarray = {}
  vginfo = _GetVGInfo(vgname)
  outputarray['vg_size'] = vginfo['vg_size']
  outputarray['vg_free'] = vginfo['vg_free']

329
  hyper = hypervisor.GetHypervisor(hypervisor_type)
Iustin Pop's avatar
Iustin Pop committed
330
331
332
333
  hyp_info = hyper.GetNodeInfo()
  if hyp_info is not None:
    outputarray.update(hyp_info)

334
335
336
337
338
339
  f = open("/proc/sys/kernel/random/boot_id", 'r')
  try:
    outputarray["bootid"] = f.read(128).rstrip("\n")
  finally:
    f.close()

Iustin Pop's avatar
Iustin Pop committed
340
341
342
  return outputarray


343
def VerifyNode(what, cluster_name):
Iustin Pop's avatar
Iustin Pop committed
344
345
  """Verify the status of the local node.

346
347
348
349
350
351
352
353
354
  Based on the input L{what} parameter, various checks are done on the
  local node.

  If the I{filelist} key is present, this list of
  files is checksummed and the file/checksum pairs are returned.

  If the I{nodelist} key is present, we check that we have
  connectivity via ssh with the target nodes (and check the hostname
  report).
Iustin Pop's avatar
Iustin Pop committed
355

356
357
358
359
360
361
362
363
364
365
366
  If the I{node-net-test} key is present, we check that we have
  connectivity to the given nodes via both primary IP and, if
  applicable, secondary IPs.

  @type what: C{dict}
  @param what: a dictionary of things to check:
      - filelist: list of files for which to compute checksums
      - nodelist: list of nodes we should check ssh communication with
      - node-net-test: list of nodes we should check node daemon port
        connectivity with
      - hypervisor: list with hypervisors to run the verify for
Iustin Pop's avatar
Iustin Pop committed
367
368
369
  @rtype: dict
  @return: a dictionary with the same keys as the input dict, and
      values representing the result of the checks
Iustin Pop's avatar
Iustin Pop committed
370
371
372
373

  """
  result = {}

374
375
376
377
378
379
380
381
382
383
384
385
386
  if constants.NV_HYPERVISOR in what:
    result[constants.NV_HYPERVISOR] = tmp = {}
    for hv_name in what[constants.NV_HYPERVISOR]:
      tmp[hv_name] = hypervisor.GetHypervisor(hv_name).Verify()

  if constants.NV_FILELIST in what:
    result[constants.NV_FILELIST] = utils.FingerprintFiles(
      what[constants.NV_FILELIST])

  if constants.NV_NODELIST in what:
    result[constants.NV_NODELIST] = tmp = {}
    random.shuffle(what[constants.NV_NODELIST])
    for node in what[constants.NV_NODELIST]:
387
      success, message = _GetSshRunner(cluster_name).VerifyNodeHostname(node)
Iustin Pop's avatar
Iustin Pop committed
388
      if not success:
389
390
391
392
        tmp[node] = message

  if constants.NV_NODENETTEST in what:
    result[constants.NV_NODENETTEST] = tmp = {}
393
394
    my_name = utils.HostInfo().name
    my_pip = my_sip = None
395
    for name, pip, sip in what[constants.NV_NODENETTEST]:
396
397
398
399
400
      if name == my_name:
        my_pip = pip
        my_sip = sip
        break
    if not my_pip:
401
402
      tmp[my_name] = ("Can't find my own primary/secondary IP"
                      " in the node list")
403
    else:
Michael Hanselmann's avatar
Michael Hanselmann committed
404
      port = utils.GetNodeDaemonPort()
405
      for name, pip, sip in what[constants.NV_NODENETTEST]:
406
407
408
409
410
411
412
        fail = []
        if not utils.TcpPing(pip, port, source=my_pip):
          fail.append("primary")
        if sip != pip:
          if not utils.TcpPing(sip, port, source=my_sip):
            fail.append("secondary")
        if fail:
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
          tmp[name] = ("failure using the %s interface(s)" %
                       " and ".join(fail))

  if constants.NV_LVLIST in what:
    result[constants.NV_LVLIST] = GetVolumeList(what[constants.NV_LVLIST])

  if constants.NV_INSTANCELIST in what:
    result[constants.NV_INSTANCELIST] = GetInstanceList(
      what[constants.NV_INSTANCELIST])

  if constants.NV_VGLIST in what:
    result[constants.NV_VGLIST] = ListVolumeGroups()

  if constants.NV_VERSION in what:
    result[constants.NV_VERSION] = constants.PROTOCOL_VERSION

  if constants.NV_HVINFO in what:
    hyper = hypervisor.GetHypervisor(what[constants.NV_HVINFO])
    result[constants.NV_HVINFO] = hyper.GetNodeInfo()
432

Iustin Pop's avatar
Iustin Pop committed
433
434
435
436
437
438
  return result


def GetVolumeList(vg_name):
  """Compute list of logical volumes and their size.

Iustin Pop's avatar
Iustin Pop committed
439
440
441
442
443
444
445
446
447
448
449
  @type vg_name: str
  @param vg_name: the volume group whose LVs we should list
  @rtype: dict
  @return:
      dictionary of all partions (key) with value being a tuple of
      their size (in MiB), inactive and online status::

        {'test1': ('20.06', True, True)}

      in case of errors, a string is returned with the error
      details.
Iustin Pop's avatar
Iustin Pop committed
450
451

  """
452
453
454
455
456
  lvs = {}
  sep = '|'
  result = utils.RunCmd(["lvs", "--noheadings", "--units=m", "--nosuffix",
                         "--separator=%s" % sep,
                         "-olv_name,lv_size,lv_attr", vg_name])
Iustin Pop's avatar
Iustin Pop committed
457
  if result.failed:
458
459
    logging.error("Failed to list logical volumes, lvs output: %s",
                  result.output)
460
    return result.output
461

462
  valid_line_re = re.compile("^ *([^|]+)\|([0-9.]+)\|([^|]{6})\|?$")
463
  for line in result.stdout.splitlines():
464
465
466
    line = line.strip()
    match = valid_line_re.match(line)
    if not match:
467
      logging.error("Invalid line returned from lvs output: '%s'", line)
468
469
      continue
    name, size, attr = match.groups()
470
471
472
473
474
    inactive = attr[4] == '-'
    online = attr[5] == 'o'
    lvs[name] = (size, inactive, online)

  return lvs
Iustin Pop's avatar
Iustin Pop committed
475
476
477


def ListVolumeGroups():
Alexander Schreiber's avatar
Alexander Schreiber committed
478
  """List the volume groups and their size.
Iustin Pop's avatar
Iustin Pop committed
479

Iustin Pop's avatar
Iustin Pop committed
480
481
482
  @rtype: dict
  @return: dictionary with keys volume name and values the
      size of the volume
Iustin Pop's avatar
Iustin Pop committed
483
484
485
486
487

  """
  return utils.ListVolumeGroups()


488
489
490
def NodeVolumes():
  """List all volumes on this node.

Iustin Pop's avatar
Iustin Pop committed
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
  @rtype: list
  @return:
    A list of dictionaries, each having four keys:
      - name: the logical volume name,
      - size: the size of the logical volume
      - dev: the physical device on which the LV lives
      - vg: the volume group to which it belongs

    In case of errors, we return an empty list and log the
    error.

    Note that since a logical volume can live on multiple physical
    volumes, the resulting list might include a logical volume
    multiple times.

506
507
508
509
510
  """
  result = utils.RunCmd(["lvs", "--noheadings", "--units=m", "--nosuffix",
                         "--separator=|",
                         "--options=lv_name,lv_size,devices,vg_name"])
  if result.failed:
511
512
    logging.error("Failed to list logical volumes, lvs output: %s",
                  result.output)
Iustin Pop's avatar
Iustin Pop committed
513
    return []
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528

  def parse_dev(dev):
    if '(' in dev:
      return dev.split('(')[0]
    else:
      return dev

  def map_line(line):
    return {
      'name': line[0].strip(),
      'size': line[1].strip(),
      'dev': parse_dev(line[2].strip()),
      'vg': line[3].strip(),
    }

529
530
  return [map_line(line.split('|')) for line in result.stdout.splitlines()
          if line.count('|') >= 3]
531
532


Iustin Pop's avatar
Iustin Pop committed
533
def BridgesExist(bridges_list):
Alexander Schreiber's avatar
Alexander Schreiber committed
534
  """Check if a list of bridges exist on the current node.
Iustin Pop's avatar
Iustin Pop committed
535

Iustin Pop's avatar
Iustin Pop committed
536
537
  @rtype: boolean
  @return: C{True} if all of them exist, C{False} otherwise
Iustin Pop's avatar
Iustin Pop committed
538
539
540
541
542
543
544
545
546

  """
  for bridge in bridges_list:
    if not utils.BridgeExists(bridge):
      return False

  return True


547
def GetInstanceList(hypervisor_list):
Alexander Schreiber's avatar
Alexander Schreiber committed
548
  """Provides a list of instances.
Iustin Pop's avatar
Iustin Pop committed
549

550
551
552
553
554
  @type hypervisor_list: list
  @param hypervisor_list: the list of hypervisors to query information

  @rtype: list
  @return: a list of all running instances on the current node
Iustin Pop's avatar
Iustin Pop committed
555
556
    - instance1.example.com
    - instance2.example.com
Iustin Pop's avatar
Iustin Pop committed
557

558
  """
559
560
561
562
563
564
565
566
567
  results = []
  for hname in hypervisor_list:
    try:
      names = hypervisor.GetHypervisor(hname).ListInstances()
      results.extend(names)
    except errors.HypervisorError, err:
      logging.exception("Error enumerating instances for hypevisor %s", hname)
      # FIXME: should we somehow not propagate this to the master?
      raise
Iustin Pop's avatar
Iustin Pop committed
568

569
  return results
Iustin Pop's avatar
Iustin Pop committed
570
571


572
def GetInstanceInfo(instance, hname):
Alexander Schreiber's avatar
Alexander Schreiber committed
573
  """Gives back the informations about an instance as a dictionary.
Iustin Pop's avatar
Iustin Pop committed
574

575
576
577
578
  @type instance: string
  @param instance: the instance name
  @type hname: string
  @param hname: the hypervisor type of the instance
Iustin Pop's avatar
Iustin Pop committed
579

580
581
582
583
584
  @rtype: dict
  @return: dictionary with the following keys:
      - memory: memory size of instance (int)
      - state: xen state of instance (string)
      - time: cpu time of instance (float)
Iustin Pop's avatar
Iustin Pop committed
585

586
  """
Iustin Pop's avatar
Iustin Pop committed
587
588
  output = {}

589
  iinfo = hypervisor.GetHypervisor(hname).GetInstanceInfo(instance)
Iustin Pop's avatar
Iustin Pop committed
590
591
592
593
594
595
596
597
  if iinfo is not None:
    output['memory'] = iinfo[2]
    output['state'] = iinfo[4]
    output['time'] = iinfo[5]

  return output


598
def GetAllInstancesInfo(hypervisor_list):
Iustin Pop's avatar
Iustin Pop committed
599
600
  """Gather data about all instances.

Iustin Pop's avatar
Iustin Pop committed
601
  This is the equivalent of L{GetInstanceInfo}, except that it
Iustin Pop's avatar
Iustin Pop committed
602
603
604
  computes data for all instances at once, thus being faster if one
  needs data about more than one instance.

605
606
607
  @type hypervisor_list: list
  @param hypervisor_list: list of hypervisors to query for instance data

608
  @rtype: dict
609
610
611
612
  @return: dictionary of instance: data, with data having the following keys:
      - memory: memory size of instance (int)
      - state: xen state of instance (string)
      - time: cpu time of instance (float)
Iustin Pop's avatar
Iustin Pop committed
613
      - vcpus: the number of vcpus
Iustin Pop's avatar
Iustin Pop committed
614

615
  """
Iustin Pop's avatar
Iustin Pop committed
616
617
  output = {}

618
619
620
621
  for hname in hypervisor_list:
    iinfo = hypervisor.GetHypervisor(hname).GetAllInstancesInfo()
    if iinfo:
      for name, inst_id, memory, vcpus, state, times in iinfo:
622
        value = {
623
624
625
626
627
          'memory': memory,
          'vcpus': vcpus,
          'state': state,
          'time': times,
          }
628
629
630
631
        if name in output and output[name] != value:
          raise errors.HypervisorError("Instance %s running duplicate"
                                       " with different parameters" % name)
        output[name] = value
Iustin Pop's avatar
Iustin Pop committed
632
633
634
635

  return output


636
def AddOSToInstance(instance):
Alexander Schreiber's avatar
Alexander Schreiber committed
637
  """Add an OS to an instance.
Iustin Pop's avatar
Iustin Pop committed
638

639
640
  @type instance: L{objects.Instance}
  @param instance: Instance whose OS is to be installed
Iustin Pop's avatar
Iustin Pop committed
641
642
  @rtype: boolean
  @return: the success of the operation
Iustin Pop's avatar
Iustin Pop committed
643
644
645
646

  """
  inst_os = OSFromDisk(instance.os)

647
  create_env = OSEnvironment(instance)
Iustin Pop's avatar
Iustin Pop committed
648
649
650

  logfile = "%s/add-%s-%s-%d.log" % (constants.LOG_OS_DIR, instance.os,
                                     instance.name, int(time.time()))
651

652
653
  result = utils.RunCmd([inst_os.create_script], env=create_env,
                        cwd=inst_os.path, output=logfile,)
654
  if result.failed:
655
    logging.error("os create command '%s' returned error: %s, logfile: %s,"
656
                  " output: %s", result.cmd, result.fail_reason, logfile,
657
                  result.output)
658
659
660
661
662
    return False

  return True


663
def RunRenameInstance(instance, old_name):
664
665
  """Run the OS rename script for an instance.

Iustin Pop's avatar
Iustin Pop committed
666
  @type instance: L{objects.Instance}
667
668
669
  @param instance: Instance whose OS is to be installed
  @type old_name: string
  @param old_name: previous instance name
Iustin Pop's avatar
Iustin Pop committed
670
671
  @rtype: boolean
  @return: the success of the operation
672
673
674
675

  """
  inst_os = OSFromDisk(instance.os)

676
677
  rename_env = OSEnvironment(instance)
  rename_env['OLD_INSTANCE_NAME'] = old_name
678
679
680
681

  logfile = "%s/rename-%s-%s-%s-%d.log" % (constants.LOG_OS_DIR, instance.os,
                                           old_name,
                                           instance.name, int(time.time()))
Iustin Pop's avatar
Iustin Pop committed
682

683
684
  result = utils.RunCmd([inst_os.rename_script], env=rename_env,
                        cwd=inst_os.path, output=logfile)
Iustin Pop's avatar
Iustin Pop committed
685
686

  if result.failed:
687
    logging.error("os create command '%s' returned error: %s output: %s",
688
                  result.cmd, result.fail_reason, result.output)
Iustin Pop's avatar
Iustin Pop committed
689
690
691
692
693
694
695
696
    return False

  return True


def _GetVGInfo(vg_name):
  """Get informations about the volume group.

Iustin Pop's avatar
Iustin Pop committed
697
698
699
700
701
702
703
704
  @type vg_name: str
  @param vg_name: the volume group which we query
  @rtype: dict
  @return:
    A dictionary with the following keys:
      - C{vg_size} is the total size of the volume group in MiB
      - C{vg_free} is the free size of the volume group in MiB
      - C{pv_count} are the number of physical disks in that VG
Iustin Pop's avatar
Iustin Pop committed
705

Iustin Pop's avatar
Iustin Pop committed
706
707
    If an error occurs during gathering of data, we return the same dict
    with keys all set to None.
708

Iustin Pop's avatar
Iustin Pop committed
709
  """
710
711
  retdic = dict.fromkeys(["vg_size", "vg_free", "pv_count"])

Iustin Pop's avatar
Iustin Pop committed
712
713
714
715
  retval = utils.RunCmd(["vgs", "-ovg_size,vg_free,pv_count", "--noheadings",
                         "--nosuffix", "--units=m", "--separator=:", vg_name])

  if retval.failed:
716
    logging.error("volume group %s not present", vg_name)
717
    return retdic
Iustin Pop's avatar
Iustin Pop committed
718
  valarr = retval.stdout.strip().rstrip(':').split(':')
719
720
721
722
723
724
725
726
  if len(valarr) == 3:
    try:
      retdic = {
        "vg_size": int(round(float(valarr[0]), 0)),
        "vg_free": int(round(float(valarr[1]), 0)),
        "pv_count": int(valarr[2]),
        }
    except ValueError, err:
727
      logging.exception("Fail to parse vgs output")
728
  else:
729
730
    logging.error("vgs output has the wrong number of fields (expected"
                  " three): %s", str(valarr))
Iustin Pop's avatar
Iustin Pop committed
731
732
733
734
735
736
737
738
739
  return retdic


def _GatherBlockDevs(instance):
  """Set up an instance's block device(s).

  This is run on the primary node at instance startup. The block
  devices must be already assembled.

Iustin Pop's avatar
Iustin Pop committed
740
741
742
743
744
  @type instance: L{objects.Instance}
  @param instance: the instance whose disks we shoul assemble
  @rtype: list of L{bdev.BlockDev}
  @return: list of the block devices

Iustin Pop's avatar
Iustin Pop committed
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
  """
  block_devices = []
  for disk in instance.disks:
    device = _RecursiveFindBD(disk)
    if device is None:
      raise errors.BlockDeviceError("Block device '%s' is not set up." %
                                    str(disk))
    device.Open()
    block_devices.append((disk, device))
  return block_devices


def StartInstance(instance, extra_args):
  """Start an instance.

Iustin Pop's avatar
Iustin Pop committed
760
  @type instance: L{objects.Instance}
761
762
763
  @param instance: the instance object
  @rtype: boolean
  @return: whether the startup was successful or not
Iustin Pop's avatar
Iustin Pop committed
764

765
  """
766
  running_instances = GetInstanceList([instance.hypervisor])
Iustin Pop's avatar
Iustin Pop committed
767
768
769
770
771

  if instance.name in running_instances:
    return True

  block_devices = _GatherBlockDevs(instance)
772
  hyper = hypervisor.GetHypervisor(instance.hypervisor)
Iustin Pop's avatar
Iustin Pop committed
773
774
775
776

  try:
    hyper.StartInstance(instance, block_devices, extra_args)
  except errors.HypervisorError, err:
777
    logging.exception("Failed to start instance")
Iustin Pop's avatar
Iustin Pop committed
778
779
780
781
782
783
784
785
    return False

  return True


def ShutdownInstance(instance):
  """Shut an instance down.

Iustin Pop's avatar
Iustin Pop committed
786
787
788
  @note: this functions uses polling with a hardcoded timeout.

  @type instance: L{objects.Instance}
789
790
791
  @param instance: the instance object
  @rtype: boolean
  @return: whether the startup was successful or not
Iustin Pop's avatar
Iustin Pop committed
792

793
  """
794
795
  hv_name = instance.hypervisor
  running_instances = GetInstanceList([hv_name])
Iustin Pop's avatar
Iustin Pop committed
796
797
798
799

  if instance.name not in running_instances:
    return True

800
  hyper = hypervisor.GetHypervisor(hv_name)
Iustin Pop's avatar
Iustin Pop committed
801
802
803
  try:
    hyper.StopInstance(instance)
  except errors.HypervisorError, err:
804
    logging.error("Failed to stop instance")
Iustin Pop's avatar
Iustin Pop committed
805
806
807
808
809
810
811
    return False

  # test every 10secs for 2min
  shutdown_ok = False

  time.sleep(1)
  for dummy in range(11):
812
    if instance.name not in GetInstanceList([hv_name]):
Iustin Pop's avatar
Iustin Pop committed
813
814
815
816
      break
    time.sleep(10)
  else:
    # the shutdown did not succeed
817
    logging.error("shutdown of '%s' unsuccessful, using destroy", instance)
Iustin Pop's avatar
Iustin Pop committed
818
819
820
821

    try:
      hyper.StopInstance(instance, force=True)
    except errors.HypervisorError, err:
822
      logging.exception("Failed to stop instance")
Iustin Pop's avatar
Iustin Pop committed
823
824
825
      return False

    time.sleep(1)
826
    if instance.name in GetInstanceList([hv_name]):
827
828
      logging.error("could not shutdown instance '%s' even by destroy",
                    instance.name)
Iustin Pop's avatar
Iustin Pop committed
829
830
831
832
833
      return False

  return True


834
835
836
def RebootInstance(instance, reboot_type, extra_args):
  """Reboot an instance.

Iustin Pop's avatar
Iustin Pop committed
837
838
839
840
841
842
843
844
845
846
847
848
849
850
  @type instance: L{objects.Instance}
  @param instance: the instance object to reboot
  @type reboot_type: str
  @param reboot_type: the type of reboot, one the following
    constants:
      - L{constants.INSTANCE_REBOOT_SOFT}: only reboot the
        instance OS, do not recreate the VM
      - L{constants.INSTANCE_REBOOT_HARD}: tear down and
        restart the VM (at the hypervisor level)
      - the other reboot type (L{constants.INSTANCE_REBOOT_HARD})
        is not accepted here, since that mode is handled
        differently
  @rtype: boolean
  @return: the success of the operation
851
852

  """
853
  running_instances = GetInstanceList([instance.hypervisor])
854
855

  if instance.name not in running_instances:
856
    logging.error("Cannot reboot instance that is not running")
857
858
    return False

859
  hyper = hypervisor.GetHypervisor(instance.hypervisor)
860
861
862
863
  if reboot_type == constants.INSTANCE_REBOOT_SOFT:
    try:
      hyper.RebootInstance(instance)
    except errors.HypervisorError, err:
864
      logging.exception("Failed to soft reboot instance")
865
866
867
868
869
870
      return False
  elif reboot_type == constants.INSTANCE_REBOOT_HARD:
    try:
      ShutdownInstance(instance)
      StartInstance(instance, extra_args)
    except errors.HypervisorError, err:
871
      logging.exception("Failed to hard reboot instance")
872
873
874
875
876
877
878
      return False
  else:
    raise errors.ParameterError("reboot_type invalid")

  return True


879
880
881
def MigrateInstance(instance, target, live):
  """Migrates an instance to another node.

Iustin Pop's avatar
Iustin Pop committed
882
  @type instance: L{objects.Instance}
883
884
885
886
887
888
889
890
891
892
893
  @param instance: the instance definition
  @type target: string
  @param target: the target node name
  @type live: boolean
  @param live: whether the migration should be done live or not (the
      interpretation of this parameter is left to the hypervisor)
  @rtype: tuple
  @return: a tuple of (success, msg) where:
      - succes is a boolean denoting the success/failure of the operation
      - msg is a string with details in case of failure

894
  """
895
  hyper = hypervisor.GetHypervisor(instance.hypervisor_name)
896
897

  try:
898
    hyper.MigrateInstance(instance.name, target, live)
899
900
  except errors.HypervisorError, err:
    msg = "Failed to migrate instance: %s" % str(err)
901
    logging.error(msg)
902
903
904
905
    return (False, msg)
  return (True, "Migration successfull")


906
def CreateBlockDevice(disk, size, owner, on_primary, info):
Iustin Pop's avatar
Iustin Pop committed
907
908
  """Creates a block device for an instance.

Iustin Pop's avatar
Iustin Pop committed
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
  @type disk: L{objects.Disk}
  @param disk: the object describing the disk we should create
  @type size: int
  @param size: the size of the physical underlying device, in MiB
  @type owner: str
  @param owner: the name of the instance for which disk is created,
      used for device cache data
  @type on_primary: boolean
  @param on_primary:  indicates if it is the primary node or not
  @type info: string
  @param info: string that will be sent to the physical device
      creation, used for example to set (LVM) tags on LVs

  @return: the new unique_id of the device (this can sometime be
      computed only after creation), or None. On secondary nodes,
      it's not required to return anything.
Iustin Pop's avatar
Iustin Pop committed
925
926
927
928
929

  """
  clist = []
  if disk.children:
    for child in disk.children:
930
      crdev = _RecursiveAssembleBD(child, owner, on_primary)
Iustin Pop's avatar
Iustin Pop committed
931
932
933
934
935
936
937
938
      if on_primary or disk.AssembleOnSecondary():
        # we need the children open in case the device itself has to
        # be assembled
        crdev.Open()
      clist.append(crdev)
  try:
    device = bdev.FindDevice(disk.dev_type, disk.physical_id, clist)
    if device is not None:
939
      logging.info("removing existing device %s", disk)
Iustin Pop's avatar
Iustin Pop committed
940
941
942
943
944
945
946
947
948
949
      device.Remove()
  except errors.BlockDeviceError, err:
    pass

  device = bdev.Create(disk.dev_type, disk.physical_id,
                       clist, size)
  if device is None:
    raise ValueError("Can't create child device for %s, %s" %
                     (disk, size))
  if on_primary or disk.AssembleOnSecondary():
950
    if not device.Assemble():
951
      errorstring = "Can't assemble device after creation"
952
      logging.error(errorstring)
953
954
      raise errors.BlockDeviceError("%s, very unusual event - check the node"
                                    " daemon logs" % errorstring)
955
    device.SetSyncSpeed(constants.SYNC_SPEED)
Iustin Pop's avatar
Iustin Pop committed
956
957
    if on_primary or disk.OpenOnSecondary():
      device.Open(force=True)
958
959
    DevCacheManager.UpdateCache(device.dev_path, owner,
                                on_primary, disk.iv_name)
960
961
962

  device.SetInfo(info)

Iustin Pop's avatar
Iustin Pop committed
963
964
965
966
967
968
969
  physical_id = device.unique_id
  return physical_id


def RemoveBlockDevice(disk):
  """Remove a block device.

Iustin Pop's avatar
Iustin Pop committed
970
971
972
973
974
975
  @note: This is intended to be called recursively.

  @type disk: L{objects.disk}
  @param disk: the disk object we should remove
  @rtype: boolean
  @return: the success of the operation
Iustin Pop's avatar
Iustin Pop committed
976
977
978
979
980
981
982
983

  """
  try:
    # since we are removing the device, allow a partial match
    # this allows removal of broken mirrors
    rdev = _RecursiveFindBD(disk, allow_partial=True)
  except errors.BlockDeviceError, err:
    # probably can't attach
984
    logging.info("Can't attach to device %s in remove", disk)
Iustin Pop's avatar
Iustin Pop committed
985
986
    rdev = None
  if rdev is not None:
987
    r_path = rdev.dev_path
Iustin Pop's avatar
Iustin Pop committed
988
    result = rdev.Remove()
989
990
    if result:
      DevCacheManager.RemoveCache(r_path)
Iustin Pop's avatar
Iustin Pop committed
991
992
993
994
995
996
997
998
  else:
    result = True
  if disk.children:
    for child in disk.children:
      result = result and RemoveBlockDevice(child)
  return result


999
def _RecursiveAssembleBD(disk, owner, as_primary):
Iustin Pop's avatar
Iustin Pop committed
1000
1001
1002
1003
  """Activate a block device for an instance.

  This is run on the primary and secondary nodes for an instance.

Iustin Pop's avatar
Iustin Pop committed
1004
  @note: this function is called recursively.
Iustin Pop's avatar
Iustin Pop committed
1005

Iustin Pop's avatar
Iustin Pop committed
1006
1007
1008
1009
1010
1011
1012
  @type disk: L{objects.Disk}
  @param disk: the disk we try to assemble
  @type owner: str
  @param owner: the name of the instance which owns the disk
  @type as_primary: boolean
  @param as_primary: if we should make the block device
      read/write
Iustin Pop's avatar
Iustin Pop committed
1013

Iustin Pop's avatar
Iustin Pop committed
1014
1015
1016
1017
1018
  @return: the assembled device or None (in case no device
      was assembled)
  @raise errors.BlockDeviceError: in case there is an error
      during the activation of the children or the device
      itself
Iustin Pop's avatar
Iustin Pop committed
1019
1020
1021
1022

  """
  children = []
  if disk.children:
1023
1024
1025
1026
1027
    mcn = disk.ChildrenNeeded()
    if mcn == -1:
      mcn = 0 # max number of Nones allowed
    else:
      mcn = len(disk.children) - mcn # max number of Nones
Iustin Pop's avatar
Iustin Pop committed
1028
    for chld_disk in disk.children:
1029
1030
1031
      try:
        cdev = _RecursiveAssembleBD(chld_disk, owner, as_primary)
      except errors.BlockDeviceError, err:
1032
        if children.count(None) >= mcn:
1033
1034
          raise
        cdev = None
1035
        logging.debug("Error in child activation: %s", str(err))
1036
      children.append(cdev)
Iustin Pop's avatar
Iustin Pop committed
1037
1038
1039

  if as_primary or disk.AssembleOnSecondary():
    r_dev = bdev.AttachOrAssemble(disk.dev_type, disk.physical_id, children)
1040
    r_dev.SetSyncSpeed(constants.SYNC_SPEED)
Iustin Pop's avatar
Iustin Pop committed
1041
1042
1043
    result = r_dev
    if as_primary or disk.OpenOnSecondary():
      r_dev.Open()
1044
1045
1046
    DevCacheManager.UpdateCache(r_dev.dev_path, owner,
                                as_primary, disk.iv_name)

Iustin Pop's avatar
Iustin Pop committed
1047
1048
1049
1050
1051
  else:
    result = True
  return result


1052
def AssembleBlockDevice(disk, owner, as_primary):
Iustin Pop's avatar
Iustin Pop committed
1053
1054
1055
1056
  """Activate a block device for an instance.

  This is a wrapper over _RecursiveAssembleBD.

Iustin Pop's avatar
Iustin Pop committed
1057
1058
1059
  @rtype: str or boolean
  @return: a C{/dev/...} path for primary nodes, and
      C{True} for secondary nodes
Iustin Pop's avatar
Iustin Pop committed
1060
1061

  """
1062
  result = _RecursiveAssembleBD(disk, owner, as_primary)
Iustin Pop's avatar
Iustin Pop committed
1063
1064
1065
1066
1067
1068
1069
1070
  if isinstance(result, bdev.BlockDev):
    result = result.dev_path
  return result


def ShutdownBlockDevice(disk):
  """Shut down a block device.

Iustin Pop's avatar
Iustin Pop committed
1071
  First, if the device is assembled (can L{Attach()}), then the device
Iustin Pop's avatar
Iustin Pop committed
1072
1073
1074
1075
1076
1077
  is shutdown. Then the children of the device are shutdown.

  This function is called recursively. Note that we don't cache the
  children or such, as oppossed to assemble, shutdown of different
  devices doesn't require that the upper device was active.

Iustin Pop's avatar
Iustin Pop committed
1078
1079
1080
1081
1082
1083
  @type disk: L{objects.Disk}
  @param disk: the description of the disk we should
      shutdown
  @rtype: boolean
  @return: the success of the operation

Iustin Pop's avatar
Iustin Pop committed
1084
1085
1086
  """
  r_dev = _RecursiveFindBD(disk)
  if r_dev is not None:
1087
    r_path = r_dev.dev_path
Iustin Pop's avatar
Iustin Pop committed
1088
    result = r_dev.Shutdown()
1089
1090
    if result:
      DevCacheManager.RemoveCache(r_path)
Iustin Pop's avatar
Iustin Pop committed
1091
1092
1093
1094
1095
1096
1097
1098
  else:
    result = True
  if disk.children:
    for child in disk.children:
      result = result and ShutdownBlockDevice(child)
  return result


1099
1100
def MirrorAddChildren(parent_cdev, new_cdevs):
  """Extend a mirrored block device.
Iustin Pop's avatar
Iustin Pop committed
1101

Iustin Pop's avatar
Iustin Pop committed
1102
1103
1104
1105
1106
1107
1108
  @type parent_cdev: L{objects.Disk}
  @param parent_cdev: the disk to which we should add children
  @type new_cdevs: list of L{objects.Disk}
  @param new_cdevs: the list of children which we should add
  @rtype: boolean
  @return: the success of the operation

Iustin Pop's avatar
Iustin Pop committed
1109
  """
1110
1111
  parent_bdev = _RecursiveFindBD(parent_cdev, allow_partial=True)
  if parent_bdev is None:
1112
    logging.error("Can't find parent device")
Iustin Pop's avatar
Iustin Pop committed
1113
    return False
1114
1115
  new_bdevs = [_RecursiveFindBD(disk) for disk in new_cdevs]
  if new_bdevs.count(None) > 0:
1116
1117
    logging.error("Can't find new device(s) to add: %s:%s",
                  new_bdevs, new_cdevs)
Iustin Pop's avatar
Iustin Pop committed
1118
    return False
1119
  parent_bdev.AddChildren(new_bdevs)
Iustin Pop's avatar
Iustin Pop committed
1120
1121
1122
  return True


1123
1124
def MirrorRemoveChildren(parent_cdev, new_cdevs):
  """Shrink a mirrored block device.
Iustin Pop's avatar
Iustin Pop committed
1125

Iustin Pop's avatar
Iustin Pop committed
1126
1127
1128
1129
1130
1131
1132
  @type parent_cdev: L{objects.Disk}
  @param parent_cdev: the disk from which we should remove children
  @type new_cdevs: list of L{objects.Disk}
  @param new_cdevs: the list of children which we should remove
  @rtype: boolean
  @return: the success of the operation

Iustin Pop's avatar
Iustin Pop committed
1133
  """
1134
1135
  parent_bdev = _RecursiveFindBD(parent_cdev)
  if parent_bdev is None:
1136
    logging.error("Can't find parent in remove children: %s", parent_cdev)
Iustin Pop's avatar
Iustin Pop committed
1137
    return False
1138
1139
1140
1141
1142
1143
  devs = []
  for disk in new_cdevs:
    rpath = disk.StaticDevPath()
    if rpath is None:
      bd = _RecursiveFindBD(disk)
      if bd is None:
1144
1145
        logging.error("Can't find dynamic device %s while removing children",
                      disk)
1146
1147
1148
1149
1150
1151
        return False
      else:
        devs.append(bd.dev_path)
    else:
      devs.append(rpath)
  parent_bdev.RemoveChildren(devs)
Iustin Pop's avatar
Iustin Pop committed
1152
1153
1154
1155
1156
1157
  return True


def GetMirrorStatus(disks):
  """Get the mirroring status of a list of devices.

Iustin Pop's avatar
Iustin Pop committed
1158
1159
1160
1161
1162
1163
1164
1165
  @type disks: list of L{objects.Disk}
  @param disks: the list of disks which we should query
  @rtype: disk
  @return:
      a list of (mirror_done, estimated_time) tuples, which
      are the result of L{bdev.BlockDevice.CombinedSyncStatus}
  @raise errors.BlockDeviceError: if any of the disks cannot be
      found
Iustin Pop's avatar
Iustin Pop committed
1166
1167
1168
1169
1170
1171

  """
  stats = []
  for dsk in disks:
    rbd = _RecursiveFindBD(dsk)
    if rbd is None:
1172
      raise errors.BlockDeviceError("Can't find device %s" % str(dsk))
Iustin Pop's avatar
Iustin Pop committed
1173
1174
1175
1176
1177
1178
1179
1180
1181
    stats.append(rbd.CombinedSyncStatus())
  return stats


def _RecursiveFindBD(disk, allow_partial=False):
  """Check if a device is activated.

  If so, return informations about the real device.

Iustin Pop's avatar
Iustin Pop committed
1182
1183
1184
1185
1186
1187
  @type disk: L{objects.Disk}
  @param disk: the disk object we need to find
  @type allow_partial: boolean
  @param allow_partial: if true, don't abort the find if a
      child of the device can't be found; this is intended
      to be used when repairing mirrors
Iustin Pop's avatar
Iustin Pop committed
1188

Iustin Pop's avatar
Iustin Pop committed
1189
1190
  @return: None if the device can't be found,
      otherwise the device instance
Iustin Pop's avatar
Iustin Pop committed
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203

  """
  children = []
  if disk.children:
    for chdisk in disk.children:
      children.append(_RecursiveFindBD(chdisk))

  return bdev.FindDevice(disk.dev_type, disk.physical_id, children)


def FindBlockDevice(disk):
  """Check if a device is activated.

Iustin Pop's avatar
Iustin Pop committed
1204
  If it is, return informations about the real device.
Iustin Pop's avatar
Iustin Pop committed
1205

Iustin Pop's avatar
Iustin Pop committed
1206
1207
1208
1209
1210
1211
  @type disk: L{objects.Disk}
  @param disk: the disk to find
  @rtype: None or tuple
  @return: None if the disk cannot be found, otherwise a
      tuple (device_path, major, minor, sync_percent,
      estimated_time, is_degraded)
Iustin Pop's avatar
Iustin Pop committed
1212
1213
1214
1215
1216

  """
  rbd = _RecursiveFindBD(disk)
  if rbd is None:
    return rbd
1217
  return (rbd.dev_path, rbd.major, rbd.minor) + rbd.GetSyncStatus()
Iustin Pop's avatar
Iustin Pop committed
1218
1219
1220
1221
1222
1223
1224
1225


def UploadFile(file_name, data, mode, uid, gid, atime, mtime):
  """Write a file to the filesystem.

  This allows the master to overwrite(!) a file. It will only perform
  the operation if the file belongs to a list of configuration files.

Iustin Pop's avatar
Iustin Pop committed
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
  @type file_name: str
  @param file_name: the target file name
  @type data: str
  @param data: the new contents of the file
  @type mode: int
  @param mode: the mode to give the file (can be None)
  @type uid: int
  @param uid: the owner of the file (can be -1 for default)
  @type gid: int
  @param gid: the group of the file (can be -1 for default)
  @type atime: float
  @param atime: the atime to set on the file (can be None)
  @type mtime: float
  @param mtime: the mtime to set on the file (can be None)
  @rtype: boolean
  @return: the success of the operation; errors are logged
      in the node daemon log

Iustin Pop's avatar
Iustin Pop committed
1244
1245
  """
  if not os.path.isabs(file_name):