backend.py 41.1 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
33
34
35
36
37
38
39
40
41
42
#

# 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 tempfile
import stat
import errno
import re
import subprocess

from ganeti import logger
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
43
from ganeti import ssconf
Iustin Pop's avatar
Iustin Pop committed
44
45
46
47
48
49


def StartMaster():
  """Activate local node as master node.

  There are two needed steps for this:
50
    - run the master script
Iustin Pop's avatar
Iustin Pop committed
51
52
53
    - register the cron script

  """
54
  result = utils.RunCmd([constants.MASTER_SCRIPT, "-d", "start"])
Iustin Pop's avatar
Iustin Pop committed
55
56
57

  if result.failed:
    logger.Error("could not activate cluster interface with command %s,"
58
                 " error: '%s'" % (result.cmd, result.output))
Iustin Pop's avatar
Iustin Pop committed
59
60
61
62
63
64
65
66
67
    return False

  return True


def StopMaster():
  """Deactivate this node as master.

  This does two things:
68
    - run the master stop script
Iustin Pop's avatar
Iustin Pop committed
69
70
71
    - remove link to master cron script.

  """
72
  result = utils.RunCmd([constants.MASTER_SCRIPT, "-d", "stop"])
Iustin Pop's avatar
Iustin Pop committed
73
74
75

  if result.failed:
    logger.Error("could not deactivate cluster interface with command %s,"
76
                 " error: '%s'" % (result.cmd, result.output))
Iustin Pop's avatar
Iustin Pop committed
77
78
79
80
81
    return False

  return True


Iustin Pop's avatar
Iustin Pop committed
82
def AddNode(dsa, dsapub, rsa, rsapub, sshkey, sshpub):
83
  """Joins this node to the cluster.
Iustin Pop's avatar
Iustin Pop committed
84

85
86
87
88
  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
89

90
  """
91
92
93
94
  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)]
95
  for name, content, mode in sshd_keys:
96
    utils.WriteFile(name, data=content, mode=mode)
Iustin Pop's avatar
Iustin Pop committed
97

98
99
100
101
102
103
  try:
    priv_key, pub_key, auth_keys = ssh.GetUserFiles(constants.GANETI_RUNAS,
                                                    mkdir=True)
  except errors.OpExecError, err:
    logger.Error("Error while processing user ssh files: %s" % err)
    return False
Iustin Pop's avatar
Iustin Pop committed
104

105
106
  for name, content in [(priv_key, sshkey), (pub_key, sshpub)]:
    utils.WriteFile(name, data=content, mode=0600)
Iustin Pop's avatar
Iustin Pop committed
107

108
  utils.AddAuthorizedKey(auth_keys, sshpub)
Iustin Pop's avatar
Iustin Pop committed
109

110
  utils.RunCmd([constants.SSH_INITD_SCRIPT, "restart"])
Iustin Pop's avatar
Iustin Pop committed
111
112
113
114
115
116
117
118

  return True


def LeaveCluster():
  """Cleans up the current node and prepares it to be removed from the cluster.

  """
119
120
121
122
123
  if os.path.isdir(constants.DATA_DIR):
    for rel_name in utils.ListVisibleFiles(constants.DATA_DIR):
      full_name = os.path.join(constants.DATA_DIR, rel_name)
      if os.path.isfile(full_name) and not os.path.islink(full_name):
        utils.RemoveFile(full_name)
Iustin Pop's avatar
Iustin Pop committed
124

125

126
127
128
129
  try:
    priv_key, pub_key, auth_keys = ssh.GetUserFiles(constants.GANETI_RUNAS)
  except errors.OpExecError, err:
    logger.Error("Error while processing ssh files: %s" % err)
130
131
    return

132
  f = open(pub_key, 'r')
Iustin Pop's avatar
Iustin Pop committed
133
  try:
134
    utils.RemoveAuthorizedKey(auth_keys, f.read(8192))
Iustin Pop's avatar
Iustin Pop committed
135
136
137
  finally:
    f.close()

138
139
  utils.RemoveFile(priv_key)
  utils.RemoveFile(pub_key)
Iustin Pop's avatar
Iustin Pop committed
140
141
142


def GetNodeInfo(vgname):
Alexander Schreiber's avatar
Alexander Schreiber committed
143
  """Gives back a hash with different informations about the node.
Iustin Pop's avatar
Iustin Pop committed
144
145
146
147
148
149
150
151
152
153
154

  Returns:
    { 'vg_size' : xxx,  'vg_free' : xxx, 'memory_domain0': xxx,
      'memory_free' : xxx, 'memory_total' : xxx }
    where
    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

155
  """
Iustin Pop's avatar
Iustin Pop committed
156
157
158
159
160
161
162
163
164
165
  outputarray = {}
  vginfo = _GetVGInfo(vgname)
  outputarray['vg_size'] = vginfo['vg_size']
  outputarray['vg_free'] = vginfo['vg_free']

  hyper = hypervisor.GetHypervisor()
  hyp_info = hyper.GetNodeInfo()
  if hyp_info is not None:
    outputarray.update(hyp_info)

166
167
168
169
170
171
  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
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
  return outputarray


def VerifyNode(what):
  """Verify the status of the local node.

  Args:
    what - a dictionary of things to check:
      'filelist' : list of files for which to compute checksums
      'nodelist' : list of nodes we should check communication with
      'hypervisor': run the hypervisor-specific verify

  Requested files on local node are checksummed and the result returned.

  The nodelist is traversed, with the following checks being made
  for each node:
  - known_hosts key correct
  - correct resolving of node name (target node returns its own hostname
    by ssh-execution of 'hostname', result compared against name in list.

  """
  result = {}

  if 'hypervisor' in what:
    result['hypervisor'] = hypervisor.GetHypervisor().Verify()

  if 'filelist' in what:
    result['filelist'] = utils.FingerprintFiles(what['filelist'])

  if 'nodelist' in what:
    result['nodelist'] = {}
    for node in what['nodelist']:
      success, message = ssh.VerifyNodeHostname(node)
      if not success:
        result['nodelist'][node] = message
  return result


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

  Returns:
    dictionary of all partions (key) with their size:
    test1: 20.06MiB

  """
  result = utils.RunCmd(["lvs", "--noheadings", "--units=m",
                         "-oname,size", vg_name])
  if result.failed:
    logger.Error("Failed to list logical volumes, lvs output: %s" %
                 result.output)
    return {}

  lvlist = [line.split() for line in result.output.splitlines()]
  return dict(lvlist)


def ListVolumeGroups():
Alexander Schreiber's avatar
Alexander Schreiber committed
230
  """List the volume groups and their size.
Iustin Pop's avatar
Iustin Pop committed
231
232
233
234
235
236
237
238

  Returns:
    Dictionary with keys volume name and values the size of the volume

  """
  return utils.ListVolumeGroups()


239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
def NodeVolumes():
  """List all volumes on this node.

  """
  result = utils.RunCmd(["lvs", "--noheadings", "--units=m", "--nosuffix",
                         "--separator=|",
                         "--options=lv_name,lv_size,devices,vg_name"])
  if result.failed:
    logger.Error("Failed to list logical volumes, lvs output: %s" %
                 result.output)
    return {}

  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(),
    }

  return [map_line(line.split('|')) for line in result.output.splitlines()]


Iustin Pop's avatar
Iustin Pop committed
268
def BridgesExist(bridges_list):
Alexander Schreiber's avatar
Alexander Schreiber committed
269
  """Check if a list of bridges exist on the current node.
Iustin Pop's avatar
Iustin Pop committed
270
271
272
273
274
275
276
277
278
279
280
281
282

  Returns:
    True if all of them exist, false otherwise

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

  return True


def GetInstanceList():
Alexander Schreiber's avatar
Alexander Schreiber committed
283
  """Provides a list of instances.
Iustin Pop's avatar
Iustin Pop committed
284
285
286
287
288
289

  Returns:
    A list of all running instances on the current node
    - instance1.example.com
    - instance2.example.com

290
  """
Iustin Pop's avatar
Iustin Pop committed
291
292
293
294
295
296
297
298
299
300
  try:
    names = hypervisor.GetHypervisor().ListInstances()
  except errors.HypervisorError, err:
    logger.Error("error enumerating instances: %s" % str(err))
    raise

  return names


def GetInstanceInfo(instance):
Alexander Schreiber's avatar
Alexander Schreiber committed
301
  """Gives back the informations about an instance as a dictionary.
Iustin Pop's avatar
Iustin Pop committed
302
303
304
305
306
307
308
309
310
311
312

  Args:
    instance: name of the instance (ex. instance1.example.com)

  Returns:
    { 'memory' : 511, 'state' : '-b---', 'time' : 3188.8, }
    where
    memory: memory size of instance (int)
    state: xen state of instance (string)
    time: cpu time of instance (float)

313
  """
Iustin Pop's avatar
Iustin Pop committed
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
  output = {}

  iinfo = hypervisor.GetHypervisor().GetInstanceInfo(instance)
  if iinfo is not None:
    output['memory'] = iinfo[2]
    output['state'] = iinfo[4]
    output['time'] = iinfo[5]

  return output


def GetAllInstancesInfo():
  """Gather data about all instances.

  This is the equivalent of `GetInstanceInfo()`, except that it
  computes data for all instances at once, thus being faster if one
  needs data about more than one instance.

  Returns: a dictionary of dictionaries, keys being the instance name,
    and with values:
    { 'memory' : 511, 'state' : '-b---', 'time' : 3188.8, }
    where
    memory: memory size of instance (int)
    state: xen state of instance (string)
    time: cpu time of instance (float)
    vcpus: the number of cpus

341
  """
Iustin Pop's avatar
Iustin Pop committed
342
343
344
345
  output = {}

  iinfo = hypervisor.GetHypervisor().GetAllInstancesInfo()
  if iinfo:
346
    for name, inst_id, memory, vcpus, state, times in iinfo:
Iustin Pop's avatar
Iustin Pop committed
347
348
349
350
351
352
353
354
355
356
357
      output[name] = {
        'memory': memory,
        'vcpus': vcpus,
        'state': state,
        'time': times,
        }

  return output


def AddOSToInstance(instance, os_disk, swap_disk):
Alexander Schreiber's avatar
Alexander Schreiber committed
358
  """Add an OS to an instance.
Iustin Pop's avatar
Iustin Pop committed
359
360
361
362
363
364
365
366
367
368
369

  Args:
    instance: the instance object
    os_disk: the instance-visible name of the os device
    swap_disk: the instance-visible name of the swap device

  """
  inst_os = OSFromDisk(instance.os)

  create_script = inst_os.create_script

Iustin Pop's avatar
Iustin Pop committed
370
371
  os_device = instance.FindDisk(os_disk)
  if os_device is None:
Iustin Pop's avatar
Iustin Pop committed
372
373
374
    logger.Error("Can't find this device-visible name '%s'" % os_disk)
    return False

Iustin Pop's avatar
Iustin Pop committed
375
376
  swap_device = instance.FindDisk(swap_disk)
  if swap_device is None:
Iustin Pop's avatar
Iustin Pop committed
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
    logger.Error("Can't find this device-visible name '%s'" % swap_disk)
    return False

  real_os_dev = _RecursiveFindBD(os_device)
  if real_os_dev is None:
    raise errors.BlockDeviceError("Block device '%s' is not set up" %
                                  str(os_device))
  real_os_dev.Open()

  real_swap_dev = _RecursiveFindBD(swap_device)
  if real_swap_dev is None:
    raise errors.BlockDeviceError("Block device '%s' is not set up" %
                                  str(swap_device))
  real_swap_dev.Open()

  logfile = "%s/add-%s-%s-%d.log" % (constants.LOG_OS_DIR, instance.os,
                                     instance.name, int(time.time()))
  if not os.path.exists(constants.LOG_OS_DIR):
    os.mkdir(constants.LOG_OS_DIR, 0750)

397
  command = utils.BuildShellCmd("cd %s && %s -i %s -b %s -s %s &>%s",
Iustin Pop's avatar
Iustin Pop committed
398
399
400
                                inst_os.path, create_script, instance.name,
                                real_os_dev.dev_path, real_swap_dev.dev_path,
                                logfile)
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458

  result = utils.RunCmd(command)

  if result.failed:
    logger.Error("os create command '%s' returned error: %s"
                 " output: %s" %
                 (command, result.fail_reason, result.output))
    return False

  return True


def RunRenameInstance(instance, old_name, os_disk, swap_disk):
  """Run the OS rename script for an instance.

  Args:
    instance: the instance object
    old_name: the old name of the instance
    os_disk: the instance-visible name of the os device
    swap_disk: the instance-visible name of the swap device

  """
  inst_os = OSFromDisk(instance.os)

  script = inst_os.rename_script

  os_device = instance.FindDisk(os_disk)
  if os_device is None:
    logger.Error("Can't find this device-visible name '%s'" % os_disk)
    return False

  swap_device = instance.FindDisk(swap_disk)
  if swap_device is None:
    logger.Error("Can't find this device-visible name '%s'" % swap_disk)
    return False

  real_os_dev = _RecursiveFindBD(os_device)
  if real_os_dev is None:
    raise errors.BlockDeviceError("Block device '%s' is not set up" %
                                  str(os_device))
  real_os_dev.Open()

  real_swap_dev = _RecursiveFindBD(swap_device)
  if real_swap_dev is None:
    raise errors.BlockDeviceError("Block device '%s' is not set up" %
                                  str(swap_device))
  real_swap_dev.Open()

  logfile = "%s/rename-%s-%s-%s-%d.log" % (constants.LOG_OS_DIR, instance.os,
                                           old_name,
                                           instance.name, int(time.time()))
  if not os.path.exists(constants.LOG_OS_DIR):
    os.mkdir(constants.LOG_OS_DIR, 0750)

  command = utils.BuildShellCmd("cd %s && %s -o %s -n %s -b %s -s %s &>%s",
                                inst_os.path, script, old_name, instance.name,
                                real_os_dev.dev_path, real_swap_dev.dev_path,
                                logfile)
Iustin Pop's avatar
Iustin Pop committed
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524

  result = utils.RunCmd(command)

  if result.failed:
    logger.Error("os create command '%s' returned error: %s"
                 " output: %s" %
                 (command, result.fail_reason, result.output))
    return False

  return True


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

  Args:
    vg_name: the volume group

  Returns:
    { 'vg_size' : xxx, 'vg_free' : xxx, 'pv_count' : xxx }
    where
    vg_size is the total size of the volume group in MiB
    vg_free is the free size of the volume group in MiB
    pv_count are the number of physical disks in that vg

  """
  retval = utils.RunCmd(["vgs", "-ovg_size,vg_free,pv_count", "--noheadings",
                         "--nosuffix", "--units=m", "--separator=:", vg_name])

  if retval.failed:
    errmsg = "volume group %s not present" % vg_name
    logger.Error(errmsg)
    raise errors.LVMError(errmsg)
  valarr = retval.stdout.strip().split(':')
  retdic = {
    "vg_size": int(round(float(valarr[0]), 0)),
    "vg_free": int(round(float(valarr[1]), 0)),
    "pv_count": int(valarr[2]),
    }
  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.

  """
  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.

  Args:
    instance - name of instance to start.

525
  """
Iustin Pop's avatar
Iustin Pop committed
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
  running_instances = GetInstanceList()

  if instance.name in running_instances:
    return True

  block_devices = _GatherBlockDevs(instance)
  hyper = hypervisor.GetHypervisor()

  try:
    hyper.StartInstance(instance, block_devices, extra_args)
  except errors.HypervisorError, err:
    logger.Error("Failed to start instance: %s" % err)
    return False

  return True


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

  Args:
    instance - name of instance to shutdown.

549
  """
Iustin Pop's avatar
Iustin Pop committed
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
  running_instances = GetInstanceList()

  if instance.name not in running_instances:
    return True

  hyper = hypervisor.GetHypervisor()
  try:
    hyper.StopInstance(instance)
  except errors.HypervisorError, err:
    logger.Error("Failed to stop instance: %s" % err)
    return False

  # test every 10secs for 2min
  shutdown_ok = False

  time.sleep(1)
  for dummy in range(11):
    if instance.name not in GetInstanceList():
      break
    time.sleep(10)
  else:
    # the shutdown did not succeed
    logger.Error("shutdown of '%s' unsuccessful, using destroy" % instance)

    try:
      hyper.StopInstance(instance, force=True)
    except errors.HypervisorError, err:
      logger.Error("Failed to stop instance: %s" % err)
      return False

    time.sleep(1)
    if instance.name in GetInstanceList():
      logger.Error("could not shutdown instance '%s' even by destroy")
      return False

  return True


588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
def RebootInstance(instance, reboot_type, extra_args):
  """Reboot an instance.

  Args:
    instance    - name of instance to reboot
    reboot_type - how to reboot [soft,hard,full]

  """
  running_instances = GetInstanceList()

  if instance.name not in running_instances:
    logger.Error("Cannot reboot instance that is not running")
    return False

  hyper = hypervisor.GetHypervisor()
  if reboot_type == constants.INSTANCE_REBOOT_SOFT:
    try:
      hyper.RebootInstance(instance)
    except errors.HypervisorError, err:
      logger.Error("Failed to soft reboot instance: %s" % err)
      return False
  elif reboot_type == constants.INSTANCE_REBOOT_HARD:
    try:
      ShutdownInstance(instance)
      StartInstance(instance, extra_args)
    except errors.HypervisorError, err:
      logger.Error("Failed to hard reboot instance: %s" % err)
      return False
  else:
    raise errors.ParameterError("reboot_type invalid")


  return True


623
def CreateBlockDevice(disk, size, on_primary, info):
Iustin Pop's avatar
Iustin Pop committed
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
  """Creates a block device for an instance.

  Args:
   bdev: a ganeti.objects.Disk object
   size: the size of the physical underlying devices
   do_open: if the device should be `Assemble()`-d and
            `Open()`-ed after creation

  Returns:
    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.

  """
  clist = []
  if disk.children:
    for child in disk.children:
      crdev = _RecursiveAssembleBD(child, on_primary)
      if on_primary or disk.AssembleOnSecondary():
        # we need the children open in case the device itself has to
        # be assembled
        crdev.Open()
      else:
        crdev.Close()
      clist.append(crdev)
  try:
    device = bdev.FindDevice(disk.dev_type, disk.physical_id, clist)
    if device is not None:
      logger.Info("removing existing device %s" % disk)
      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():
    device.Assemble()
664
    device.SetSyncSpeed(constants.SYNC_SPEED)
Iustin Pop's avatar
Iustin Pop committed
665
666
    if on_primary or disk.OpenOnSecondary():
      device.Open(force=True)
667
668
669

  device.SetInfo(info)

Iustin Pop's avatar
Iustin Pop committed
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
  physical_id = device.unique_id
  return physical_id


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

  This is intended to be called recursively.

  """
  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
    logger.Info("Can't attach to device %s in remove" % disk)
    rdev = None
  if rdev is not None:
    result = rdev.Remove()
  else:
    result = True
  if disk.children:
    for child in disk.children:
      result = result and RemoveBlockDevice(child)
  return result


def _RecursiveAssembleBD(disk, as_primary):
  """Activate a block device for an instance.

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

  This function is called recursively.

  Args:
    disk: a objects.Disk object
    as_primary: if we should make the block device read/write

  Returns:
    the assembled device or None (in case no device was assembled)

  If the assembly is not successful, an exception is raised.

  """
  children = []
  if disk.children:
    for chld_disk in disk.children:
      children.append(_RecursiveAssembleBD(chld_disk, as_primary))

  if as_primary or disk.AssembleOnSecondary():
    r_dev = bdev.AttachOrAssemble(disk.dev_type, disk.physical_id, children)
722
    r_dev.SetSyncSpeed(constants.SYNC_SPEED)
Iustin Pop's avatar
Iustin Pop committed
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
    result = r_dev
    if as_primary or disk.OpenOnSecondary():
      r_dev.Open()
    else:
      r_dev.Close()
  else:
    result = True
  return result


def AssembleBlockDevice(disk, as_primary):
  """Activate a block device for an instance.

  This is a wrapper over _RecursiveAssembleBD.

  Returns:
    a /dev path for primary nodes
    True for secondary nodes

  """
  result = _RecursiveAssembleBD(disk, as_primary)
  if isinstance(result, bdev.BlockDev):
    result = result.dev_path
  return result


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

  First, if the device is assembled (can `Attach()`), then the device
  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.

  """
  r_dev = _RecursiveFindBD(disk)
  if r_dev is not None:
    result = r_dev.Shutdown()
  else:
    result = True
  if disk.children:
    for child in disk.children:
      result = result and ShutdownBlockDevice(child)
  return result


771
772
def MirrorAddChildren(parent_cdev, new_cdevs):
  """Extend a mirrored block device.
Iustin Pop's avatar
Iustin Pop committed
773
774

  """
775
776
777
  parent_bdev = _RecursiveFindBD(parent_cdev, allow_partial=True)
  if parent_bdev is None:
    logger.Error("Can't find parent device")
Iustin Pop's avatar
Iustin Pop committed
778
    return False
779
780
781
  new_bdevs = [_RecursiveFindBD(disk) for disk in new_cdevs]
  if new_bdevs.count(None) > 0:
    logger.Error("Can't find new device(s) to add")
Iustin Pop's avatar
Iustin Pop committed
782
    return False
783
  parent_bdev.AddChildren(new_bdevs)
Iustin Pop's avatar
Iustin Pop committed
784
785
786
  return True


787
788
def MirrorRemoveChildren(parent_cdev, new_cdevs):
  """Shrink a mirrored block device.
Iustin Pop's avatar
Iustin Pop committed
789
790

  """
791
792
  parent_bdev = _RecursiveFindBD(parent_cdev)
  if parent_bdev is None:
Iustin Pop's avatar
Iustin Pop committed
793
    return False
794
795
  new_bdevs = [_RecursiveFindBD(disk) for disk in new_cdevs]
  if new_bdevs.count(None) > 0:
Iustin Pop's avatar
Iustin Pop committed
796
    return False
797
  parent_bdev.RemoveChildren(new_bdevs)
Iustin Pop's avatar
Iustin Pop committed
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
  return True


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

  Args:
    disks: list of `objects.Disk`

  Returns:
    list of (mirror_done, estimated_time) tuples, which
    are the result of bdev.BlockDevice.CombinedSyncStatus()

  """
  stats = []
  for dsk in disks:
    rbd = _RecursiveFindBD(dsk)
    if rbd is None:
816
      raise errors.BlockDeviceError("Can't find device %s" % str(dsk))
Iustin Pop's avatar
Iustin Pop committed
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
    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.

  Args:
    disk: the objects.Disk instance
    allow_partial: don't abort the find if a child of the
                   device can't be found; this is intended to be
                   used when repairing mirrors

  Returns:
    None if the device can't be found
    otherwise the device instance

  """
  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.

  If so, return informations about the real device.

  Args:
    disk: the objects.Disk instance
  Returns:
    None if the device can't be found
    (device_path, major, minor, sync_percent, estimated_time, is_degraded)

  """
  rbd = _RecursiveFindBD(disk)
  if rbd is None:
    return rbd
  sync_p, est_t, is_degr = rbd.GetSyncStatus()
  return rbd.dev_path, rbd.major, rbd.minor, sync_p, est_t, is_degr


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.

  """
  if not os.path.isabs(file_name):
    logger.Error("Filename passed to UploadFile is not absolute: '%s'" %
                 file_name)
    return False

876
  allowed_files = [constants.CLUSTER_CONF_FILE, "/etc/hosts",
Iustin Pop's avatar
Iustin Pop committed
877
                   constants.SSH_KNOWN_HOSTS_FILE]
878
879
  allowed_files.extend(ssconf.SimpleStore().GetFileList())
  if file_name not in allowed_files:
Iustin Pop's avatar
Iustin Pop committed
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
    logger.Error("Filename passed to UploadFile not in allowed"
                 " upload targets: '%s'" % file_name)
    return False

  dir_name, small_name = os.path.split(file_name)
  fd, new_name = tempfile.mkstemp('.new', small_name, dir_name)
  # here we need to make sure we remove the temp file, if any error
  # leaves it in place
  try:
    os.chown(new_name, uid, gid)
    os.chmod(new_name, mode)
    os.write(fd, data)
    os.fsync(fd)
    os.utime(new_name, (atime, mtime))
    os.rename(new_name, file_name)
  finally:
    os.close(fd)
    utils.RemoveFile(new_name)
  return True

900

Iustin Pop's avatar
Iustin Pop committed
901
902
903
904
905
906
907
908
909
910
911
912
913
914
def _ErrnoOrStr(err):
  """Format an EnvironmentError exception.

  If the `err` argument has an errno attribute, it will be looked up
  and converted into a textual EXXXX description. Otherwise the string
  representation of the error will be returned.

  """
  if hasattr(err, 'errno'):
    detail = errno.errorcode[err.errno]
  else:
    detail = str(err)
  return detail

915
916
917
918
919
920
def _OSSearch(name, search_path=None):
  """Search for OSes with the given name in the search_path.

  Args:
    name: The name of the OS to look for
    search_path: List of dirs to search (defaults to constants.OS_SEARCH_PATH)
921

922
923
924
925
926
927
928
929
930
931
932
933
934
935
  Returns:
    The base_dir the OS resides in

  """

  if search_path is None:
    search_path = constants.OS_SEARCH_PATH

  for dir in search_path:
    t_os_dir = os.path.sep.join([dir, name])
    if os.path.isdir(t_os_dir):
        return dir

  return None
Iustin Pop's avatar
Iustin Pop committed
936

937
def _OSOndiskVersion(name, os_dir):
Alexander Schreiber's avatar
Alexander Schreiber committed
938
  """Compute and return the API version of a given OS.
Iustin Pop's avatar
Iustin Pop committed
939

Alexander Schreiber's avatar
Alexander Schreiber committed
940
  This function will try to read the API version of the os given by
941
942
943
944
  the 'name' parameter and residing in the 'os_dir' directory.

  Return value will be either an integer denoting the version or None in the
  case when this is not a valid OS name.
Iustin Pop's avatar
Iustin Pop committed
945
946
947
948
949
950
951
952

  """

  api_file = os.path.sep.join([os_dir, "ganeti_api_version"])

  try:
    st = os.stat(api_file)
  except EnvironmentError, err:
953
    raise errors.InvalidOS(name, os_dir, "'ganeti_api_version' file not"
954
                           " found (%s)" % _ErrnoOrStr(err))
Iustin Pop's avatar
Iustin Pop committed
955
956

  if not stat.S_ISREG(stat.S_IFMT(st.st_mode)):
957
    raise errors.InvalidOS(name, os_dir, "'ganeti_api_version' file is not"
958
                           " a regular file")
Iustin Pop's avatar
Iustin Pop committed
959
960
961
962
963
964
965
966

  try:
    f = open(api_file)
    try:
      api_version = f.read(256)
    finally:
      f.close()
  except EnvironmentError, err:
967
    raise errors.InvalidOS(name, os_dir, "error while reading the"
968
                           " API version (%s)" % _ErrnoOrStr(err))
Iustin Pop's avatar
Iustin Pop committed
969
970
971
972
973

  api_version = api_version.strip()
  try:
    api_version = int(api_version)
  except (TypeError, ValueError), err:
974
975
    raise errors.InvalidOS(name, os_dir,
                           "API version is not integer (%s)" % str(err))
Iustin Pop's avatar
Iustin Pop committed
976
977
978

  return api_version

979

980
def DiagnoseOS(top_dirs=None):
Iustin Pop's avatar
Iustin Pop committed
981
982
  """Compute the validity for all OSes.

983
984
  For each name in all the given top directories (if not given defaults i
  to constants.OS_SEARCH_PATH it will return an object. If this is a valid
Iustin Pop's avatar
Iustin Pop committed
985
986
987
988
989
990
991
992
  os, the object will be an instance of the object.OS class. If not,
  it will be an instance of errors.InvalidOS and this signifies that
  this name does not correspond to a valid OS.

  Returns:
    list of objects

  """
993
994
  if top_dirs is None:
    top_dirs = constants.OS_SEARCH_PATH
Iustin Pop's avatar
Iustin Pop committed
995
996

  result = []
997
998
999
  for dir in top_dirs:
    if os.path.isdir(dir):
      try:
1000
        f_names = utils.ListVisibleFiles(dir)
1001
1002
1003
1004
1005
      except EnvironmentError, err:
        logger.Error("Can't list the OS directory %s: %s" % (dir,str(err)))
        break
      for name in f_names:
        try:
1006
          os_inst = OSFromDisk(name, base_dir=dir)
1007
1008
1009
          result.append(os_inst)
        except errors.InvalidOS, err:
          result.append(err)
Iustin Pop's avatar
Iustin Pop committed
1010
1011
1012
1013

  return result


1014
def OSFromDisk(name, base_dir=None):
Iustin Pop's avatar
Iustin Pop committed
1015
1016
1017
1018
1019
1020
1021
  """Create an OS instance from disk.

  This function will return an OS instance if the given name is a
  valid OS name. Otherwise, it will raise an appropriate
  `errors.InvalidOS` exception, detailing why this is not a valid
  OS.

1022
1023
1024
1025
  Args:
    os_dir: Directory containing the OS scripts. Defaults to a search
            in all the OS_SEARCH_PATH directories.

Iustin Pop's avatar
Iustin Pop committed
1026
  """
1027

1028
1029
  if base_dir is None:
    base_dir = _OSSearch(name)
1030

1031
  if base_dir is None:
1032
    raise errors.InvalidOS(name, None, "OS dir not found in search path")
Iustin Pop's avatar
Iustin Pop committed
1033

1034
  os_dir = os.path.sep.join([base_dir, name])
1035
  api_version = _OSOndiskVersion(name, os_dir)
Iustin Pop's avatar
Iustin Pop committed
1036
1037

  if api_version != constants.OS_API_VERSION:
1038
1039
    raise errors.InvalidOS(name, os_dir, "API version mismatch"
                           " (found %s want %s)"
1040
                           % (api_version, constants.OS_API_VERSION))
Iustin Pop's avatar
Iustin Pop committed
1041
1042

  # OS Scripts dictionary, we will populate it with the actual script names
1043
  os_scripts = {'create': '', 'export': '', 'import': '', 'rename': ''}
Iustin Pop's avatar
Iustin Pop committed
1044
1045
1046
1047
1048
1049
1050

  for script in os_scripts:
    os_scripts[script] = os.path.sep.join([os_dir, script])

    try:
      st = os.stat(os_scripts[script])
    except EnvironmentError, err:
1051
      raise errors.InvalidOS(name, os_dir, "'%s' script missing (%s)" %
1052
                             (script, _ErrnoOrStr(err)))
Iustin Pop's avatar
Iustin Pop committed
1053
1054

    if stat.S_IMODE(st.st_mode) & stat.S_IXUSR != stat.S_IXUSR:
1055
1056
      raise errors.InvalidOS(name, os_dir, "'%s' script not executable" %
                             script)
Iustin Pop's avatar
Iustin Pop committed
1057
1058

    if not stat.S_ISREG(stat.S_IFMT(st.st_mode)):
1059
1060
      raise errors.InvalidOS(name, os_dir, "'%s' is not a regular file" %
                             script)
Iustin Pop's avatar
Iustin Pop committed
1061
1062
1063
1064
1065
1066


  return objects.OS(name=name, path=os_dir,
                    create_script=os_scripts['create'],
                    export_script=os_scripts['export'],
                    import_script=os_scripts['import'],
1067
                    rename_script=os_scripts['rename'],
Iustin Pop's avatar
Iustin Pop committed
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
                    api_version=api_version)


def SnapshotBlockDevice(disk):
  """Create a snapshot copy of a block device.

  This function is called recursively, and the snapshot is actually created
  just for the leaf lvm backend device.

  Args:
    disk: the disk to be snapshotted

  Returns:
    a config entry for the actual lvm device snapshotted.

1083
  """
Iustin Pop's avatar
Iustin Pop committed
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
  if disk.children:
    if len(disk.children) == 1:
      # only one child, let's recurse on it
      return SnapshotBlockDevice(disk.children[0])
    else:
      # more than one child, choose one that matches
      for child in disk.children:
        if child.size == disk.size:
          # return implies breaking the loop
          return SnapshotBlockDevice(child)
1094
  elif disk.dev_type == constants.LD_LV:
Iustin Pop's avatar
Iustin Pop committed
1095
1096
1097
1098
1099
1100
1101
    r_dev = _RecursiveFindBD(disk)
    if r_dev is not None:
      # let's stay on the safe side and ask for the full size, for now
      return r_dev.Snapshot(disk.size)
    else:
      return None
  else:
1102
1103
1104
    raise errors.ProgrammerError("Cannot snapshot non-lvm block device"
                                 "'%s' of type '%s'" %
                                 (disk.unique_id, disk.dev_type))
Iustin Pop's avatar
Iustin Pop committed
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117


def ExportSnapshot(disk, dest_node, instance):
  """Export a block device snapshot to a remote node.

  Args:
    disk: the snapshot block device
    dest_node: the node to send the image to
    instance: instance being exported

  Returns:
    True if successful, False otherwise.

1118
  """
Iustin Pop's avatar
Iustin Pop committed
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
  inst_os = OSFromDisk(instance.os)
  export_script = inst_os.export_script

  logfile = "%s/exp-%s-%s-%s.log" % (constants.LOG_OS_DIR, inst_os.name,
                                     instance.name, int(time.time()))
  if not os.path.exists(constants.LOG_OS_DIR):
    os.mkdir(constants.LOG_OS_DIR, 0750)

  real_os_dev = _RecursiveFindBD(disk)
  if real_os_dev is None:
    raise errors.BlockDeviceError("Block device '%s' is not set up" %
                                  str(disk))
  real_os_dev.Open()

  destdir = os.path.join(constants.EXPORT_DIR, instance.name + ".new")
  destfile = disk.physical_id[1]

  # the target command is built out of three individual commands,
  # which are joined by pipes; we check each individual command for
  # valid parameters

  expcmd = utils.BuildShellCmd("cd %s; %s -i %s -b %s 2>%s", inst_os.path,
                               export_script, instance.name,
                               real_os_dev.dev_path, logfile)

  comprcmd = "gzip"

1146
  destcmd = utils.BuildShellCmd("mkdir -p %s && cat > %s/%s",
1147
                                destdir, destdir, destfile)
1148
  remotecmd = ssh.BuildSSHCmd(dest_node, constants.GANETI_RUNAS, destcmd)
1149
1150


Iustin Pop's avatar
Iustin Pop committed
1151
1152

  # all commands have been checked, so we're safe to combine them
1153
  command = '|'.join([expcmd, comprcmd, utils.ShellQuoteArgs(remotecmd)])
Iustin Pop's avatar
Iustin Pop committed
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175

  result = utils.RunCmd(command)

  if result.failed:
    logger.Error("os snapshot export command '%s' returned error: %s"
                 " output: %s" %
                 (command, result.fail_reason, result.output))
    return False

  return True


def FinalizeExport(instance, snap_disks):
  """Write out the export configuration information.

  Args:
    instance: instance configuration
    snap_disks: snapshot block devices

  Returns:
    False in case of error, True otherwise.

1176
  """
Iustin Pop's avatar
Iustin Pop committed
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
  destdir = os.path.join(constants.EXPORT_DIR, instance.name + ".new")
  finaldestdir = os.path.join(constants.EXPORT_DIR, instance.name)

  config = objects.SerializableConfigParser()

  config.add_section(constants.INISECT_EXP)
  config.set(constants.INISECT_EXP, 'version', '0')
  config.set(constants.INISECT_EXP, 'timestamp', '%d' % int(time.time()))
  config.set(constants.INISECT_EXP, 'source', instance.primary_node)
  config.set(constants.INISECT_EXP, 'os', instance.os)
  config.set(constants.INISECT_EXP, 'compression', 'gzip')

  config.add_section(constants.INISECT_INS)
  config.set(constants.INISECT_INS, 'name', instance.name)
  config.set(constants.INISECT_INS, 'memory', '%d' % instance.memory)
  config.set(constants.INISECT_INS, 'vcpus', '%d' % instance.vcpus)
  config.set(constants.INISECT_INS, 'disk_template', instance.disk_template)
  for nic_count, nic in enumerate(instance.nics):
    config.set(constants.INISECT_INS, 'nic%d_mac' %
               nic_count, '%s' % nic.mac)
    config.set(constants.INISECT_INS, 'nic%d_ip' % nic_count, '%s' % nic.ip)
  # TODO: redundant: on load can read nics until it doesn't exist
  config.set(constants.INISECT_INS, 'nic_count' , '%d' % nic_count)

  for disk_count, disk in enumerate(snap_disks):
    config.set(constants.INISECT_INS, 'disk%d_ivname' % disk_count,
               ('%s' % disk.iv_name))
    config.set(constants.INISECT_INS, 'disk%d_dump' % disk_count,
               ('%s' % disk.physical_id[1]))
    config.set(constants.INISECT_INS, 'disk%d_size' % disk_count,
               ('%d' % disk.size))
  config.set(constants.INISECT_INS, 'disk_count' , '%d' % disk_count)

  cff = os.path.join(destdir, constants.EXPORT_CONF_FILE)
  cfo = open(cff, 'w')
  try:
    config.write(cfo)
  finally:
    cfo.close()

  shutil.rmtree(finaldestdir, True)
  shutil.move(destdir, finaldestdir)

  return True


def ExportInfo(dest):
  """Get export configuration information.

  Args:
    dest: directory containing the export

  Returns:
    A serializable config file containing the export info.

  """
  cff = os.path.join(dest, constants.EXPORT_CONF_FILE)

  config = objects.SerializableConfigParser()
  config.read(cff)

  if (not config.has_section(constants.INISECT_EXP) or
      not config.has_section(constants.INISECT_INS)):
    return None

  return config


def ImportOSIntoInstance(instance, os_disk, swap_disk, src_node, src_image):
  """Import an os image into an instance.

  Args:
    instance: the instance object
    os_disk: the instance-visible name of the os device
    swap_disk: the instance-visible name of the swap device
    src_node: node holding the source image
    src_image: path to the source image on src_node

  Returns:
    False in case of error, True otherwise.

  """
  inst_os = OSFromDisk(instance.os)
  import_script = inst_os.import_script

Iustin Pop's avatar
Iustin Pop committed
1262
1263
  os_device = instance.FindDisk(os_disk)
  if os_device is None:
Iustin Pop's avatar
Iustin Pop committed
1264
1265
1266
    logger.Error("Can't find this device-visible name '%s'" % os_disk)
    return False

Iustin Pop's avatar
Iustin Pop committed
1267
1268
  swap_device = instance.FindDisk(swap_disk)
  if swap_device is None:
Iustin Pop's avatar
Iustin Pop committed
1269
1270
1271
1272
1273
    logger.Error("Can't find this device-visible name '%s'" % swap_disk)
    return False

  real_os_dev = _RecursiveFindBD(os_device)
  if real_os_dev is None:
1274
1275
    raise errors.BlockDeviceError("Block device '%s' is not set up" %
                                  str(os_device))
Iustin Pop's avatar
Iustin Pop committed
1276
1277
1278
1279
  real_os_dev.Open()

  real_swap_dev = _RecursiveFindBD(swap_device)
  if real_swap_dev is None:
1280
1281
    raise errors.BlockDeviceError("Block device '%s' is not set up" %
                                  str(swap_device))
Iustin Pop's avatar
Iustin Pop committed
1282
1283
1284
1285
1286
1287
1288
  real_swap_dev.Open()

  logfile = "%s/import-%s-%s-%s.log" % (constants.LOG_OS_DIR, instance.os,
                                        instance.name, int(time.time()))
  if not os.path.exists(constants.LOG_OS_DIR):
    os.mkdir(constants.LOG_OS_DIR, 0750)

1289
  destcmd = utils.BuildShellCmd('cat %s', src_image)
1290
  remotecmd = ssh.BuildSSHCmd(src_node, constants.GANETI_RUNAS, destcmd)
Iustin Pop's avatar
Iustin Pop committed
1291
1292
1293
1294
1295
1296
1297

  comprcmd = "gunzip"
  impcmd = utils.BuildShellCmd("(cd %s; %s -i %s -b %s -s %s &>%s)",
                               inst_os.path, import_script, instance.name,
                               real_os_dev.dev_path, real_swap_dev.dev_path,
                               logfile)

1298
  command = '|'.join([utils.ShellQuoteArgs(remotecmd), comprcmd, impcmd])
Iustin Pop's avatar
Iustin Pop committed
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312

  result = utils.RunCmd(command)

  if result.failed:
    logger.Error("os import command '%s' returned error: %s"
                 " output: %s" %
                 (command, result.fail_reason, result.output))
    return False

  return True


def ListExports():
  """Return a list of exports currently available on this machine.
1313

Iustin Pop's avatar
Iustin Pop committed
1314
1315
  """
  if os.path.isdir(constants.EXPORT_DIR):
1316
    return utils.ListVisibleFiles(constants.EXPORT_DIR)
Iustin Pop's avatar
Iustin Pop committed
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
  else:
    return []


def RemoveExport(export):
  """Remove an existing export from the node.

  Args:
    export: the name of the export to remove

  Returns:
    False in case of error, True otherwise.

1330
  """
Iustin Pop's avatar
Iustin Pop committed
1331
1332
1333
1334
1335
1336
1337
1338
1339
  target = os.path.join(constants.EXPORT_DIR, export)

  shutil.rmtree(target)
  # TODO: catch some of the relevant exceptions and provide a pretty
  # error message if rmtree fails.

  return True


Iustin Pop's avatar
Iustin Pop committed
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
def RenameBlockDevices(devlist):
  """Rename a list of block devices.

  The devlist argument is a list of tuples (disk, new_logical,
  new_physical). The return value will be a combined boolean result
  (True only if all renames succeeded).

  """
  result = True
  for disk, unique_id in devlist:
    dev = _RecursiveFindBD(disk)
    if dev is None:
      result = False
      continue
    try:
      dev.Rename(unique_id)
    except errors.BlockDeviceError, err:
      logger.Error("Can't rename device '%s' to '%s': %s" %
                   (dev, unique_id, err))
      result = False
  return result


Iustin Pop's avatar
Iustin Pop committed
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
class HooksRunner(object):
  """Hook runner.

  This class is instantiated on the node side (ganeti-noded) and not on
  the master side.

  """
  RE_MASK = re.compile("^[a-zA-Z0-9_-]+$")

  def __init__(self, hooks_base_dir=None):
    """Constructor for hooks runner.

    Args:
      - hooks_base_dir: if not None, this overrides the
        constants.HOOKS_BASE_DIR (useful for unittests)
      - logs_base_dir: if not None, this overrides the
        constants.LOG_HOOKS_DIR (useful for unittests)
      - logging: enable or disable logging of script output

    """
    if hooks_base_dir is None:
      hooks_base_dir = constants.HOOKS_BASE_DIR
    self._BASE_DIR = hooks_base_dir

  @staticmethod
  def ExecHook(script, env):
    """Exec one hook script.

    Args:
     - phase: the phase
     - script: the full path to the script
     - env: the environment with which to exec the script

    """
    # exec the process using subprocess and log the output
    fdstdin = None
    try:
      fdstdin = open("/dev/null", "r")
      child = subprocess.Popen([script], stdin=fdstdin, stdout=subprocess.PIPE,
                               stderr=subprocess.STDOUT, close_fds=True,
                               shell=False, cwd="/",env=env)
      output = ""
      try:
        output = child.stdout.read(4096)
        child.stdout.close()
      except EnvironmentError, err:
        output += "Hook script error: %s" % str(err)

      while True:
        try:
          result = child.wait()
          break
        except EnvironmentError, err:
          if err.errno == errno.EINTR:
            continue
          raise
    finally:
      # try not to leak fds
      for fd in (fdstdin, ):
        if fd is not None:
          try:
            fd.close()
          except EnvironmentError, err:
            # just log the error
            #logger.Error("While closing fd %s: %s" % (fd, err))
            pass

    return result == 0, output

  def RunHooks(self, hpath, phase, env):
    """Run the scripts in the hooks directory.

    This method will not be usually overriden by child opcodes.

    """
    if phase == constants.HOOKS_PHASE_PRE:
      suffix = "pre"
    elif phase == constants.HOOKS_PHASE_POST:
      suffix = "post"
    else:
1443
      raise errors.ProgrammerError("Unknown hooks phase: '%s'" % phase)
Iustin Pop's avatar
Iustin Pop committed
1444
1445
1446
1447
1448
    rr = []

    subdir = "%s-%s.d" % (hpath, suffix)
    dir_name = "%s/%s" % (self._BASE_DIR, subdir)
    try:
1449
      dir_contents = utils.ListVisibleFiles(dir_name)
Iustin Pop's avatar
Iustin Pop committed
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
    except OSError, err:
      # must log
      return rr

    # we use the standard python sort order,
    # so 00name is the recommended naming scheme
    dir_contents.sort()
    for relname in dir_contents:
      fname = os.path.join(dir_name, relname)
      if not (os.path.isfile(fname) and os.access(fname, os.X_OK) and
          self.RE_MASK.match(relname) is not None):
        rrval = constants.HKR_SKIP
        output = ""
      else:
        result, output = self.ExecHook(fname, env)
        if not result:
          rrval = constants.HKR_FAIL
        else:
          rrval = constants.HKR_SUCCESS
      rr.append(("%s/%s" % (subdir, relname), rrval, output))

    return rr