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#
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#
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# Copyright (C) 2006, 2007, 2008, 2010 Google Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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"""Functions to bootstrap a new cluster.
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"""
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import os
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import os.path
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import re
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import logging
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import time
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from ganeti import rpc
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from ganeti import ssh
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from ganeti import utils
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from ganeti import errors
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from ganeti import config
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from ganeti import constants
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from ganeti import objects
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from ganeti import ssconf
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from ganeti import serializer
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from ganeti import hypervisor
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from ganeti import bdev
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from ganeti import netutils
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from ganeti import backend
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def _InitSSHSetup():
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  """Setup the SSH configuration for the cluster.
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  This generates a dsa keypair for root, adds the pub key to the
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  permitted hosts and adds the hostkey to its own known hosts.
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  """
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  priv_key, pub_key, auth_keys = ssh.GetUserFiles(constants.GANETI_RUNAS)
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56
  for name in priv_key, pub_key:
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    if os.path.exists(name):
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      utils.CreateBackup(name)
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    utils.RemoveFile(name)
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  result = utils.RunCmd(["ssh-keygen", "-t", "dsa",
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                         "-f", priv_key,
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                         "-q", "-N", ""])
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  if result.failed:
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    raise errors.OpExecError("Could not generate ssh keypair, error %s" %
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                             result.output)
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  utils.AddAuthorizedKey(auth_keys, utils.ReadFile(pub_key))
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70

    
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def GenerateHmacKey(file_name):
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  """Writes a new HMAC key.
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  @type file_name: str
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  @param file_name: Path to output file
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77
  """
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  utils.WriteFile(file_name, data="%s\n" % utils.GenerateSecret(), mode=0400,
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                  backup=True)
80

    
81

    
82
def GenerateClusterCrypto(new_cluster_cert, new_rapi_cert, new_confd_hmac_key,
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                          new_cds, rapi_cert_pem=None, cds=None,
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                          nodecert_file=constants.NODED_CERT_FILE,
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                          rapicert_file=constants.RAPI_CERT_FILE,
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                          hmackey_file=constants.CONFD_HMAC_KEY,
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                          cds_file=constants.CLUSTER_DOMAIN_SECRET_FILE):
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  """Updates the cluster certificates, keys and secrets.
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90
  @type new_cluster_cert: bool
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  @param new_cluster_cert: Whether to generate a new cluster certificate
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  @type new_rapi_cert: bool
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  @param new_rapi_cert: Whether to generate a new RAPI certificate
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  @type new_confd_hmac_key: bool
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  @param new_confd_hmac_key: Whether to generate a new HMAC key
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  @type new_cds: bool
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  @param new_cds: Whether to generate a new cluster domain secret
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  @type rapi_cert_pem: string
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  @param rapi_cert_pem: New RAPI certificate in PEM format
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  @type cds: string
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  @param cds: New cluster domain secret
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  @type nodecert_file: string
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  @param nodecert_file: optional override of the node cert file path
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  @type rapicert_file: string
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  @param rapicert_file: optional override of the rapi cert file path
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  @type hmackey_file: string
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  @param hmackey_file: optional override of the hmac key file path
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109
  """
110
  # noded SSL certificate
111
  cluster_cert_exists = os.path.exists(nodecert_file)
112
  if new_cluster_cert or not cluster_cert_exists:
113
    if cluster_cert_exists:
114
      utils.CreateBackup(nodecert_file)
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116
    logging.debug("Generating new cluster certificate at %s", nodecert_file)
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    utils.GenerateSelfSignedSslCert(nodecert_file)
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119
  # confd HMAC key
120
  if new_confd_hmac_key or not os.path.exists(hmackey_file):
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    logging.debug("Writing new confd HMAC key to %s", hmackey_file)
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    GenerateHmacKey(hmackey_file)
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  # RAPI
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  rapi_cert_exists = os.path.exists(rapicert_file)
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127
  if rapi_cert_pem:
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    # Assume rapi_pem contains a valid PEM-formatted certificate and key
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    logging.debug("Writing RAPI certificate at %s", rapicert_file)
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    utils.WriteFile(rapicert_file, data=rapi_cert_pem, backup=True)
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132
  elif new_rapi_cert or not rapi_cert_exists:
133
    if rapi_cert_exists:
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      utils.CreateBackup(rapicert_file)
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    logging.debug("Generating new RAPI certificate at %s", rapicert_file)
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    utils.GenerateSelfSignedSslCert(rapicert_file)
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  # Cluster domain secret
140
  if cds:
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    logging.debug("Writing cluster domain secret to %s", cds_file)
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    utils.WriteFile(cds_file, data=cds, backup=True)
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144
  elif new_cds or not os.path.exists(cds_file):
145
    logging.debug("Generating new cluster domain secret at %s", cds_file)
146
    GenerateHmacKey(cds_file)
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148

    
149
def _InitGanetiServerSetup(master_name):
150
  """Setup the necessary configuration for the initial node daemon.
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152
  This creates the nodepass file containing the shared password for
153
  the cluster, generates the SSL certificate and starts the node daemon.
154

155
  @type master_name: str
156
  @param master_name: Name of the master node
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158
  """
159
  # Generate cluster secrets
160
  GenerateClusterCrypto(True, False, False, False)
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162
  result = utils.RunCmd([constants.DAEMON_UTIL, "start", constants.NODED])
163
  if result.failed:
164
    raise errors.OpExecError("Could not start the node daemon, command %s"
165
                             " had exitcode %s and error %s" %
166
                             (result.cmd, result.exit_code, result.output))
167

    
168
  _WaitForNodeDaemon(master_name)
169

    
170

    
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def _WaitForNodeDaemon(node_name):
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  """Wait for node daemon to become responsive.
173

174
  """
175
  def _CheckNodeDaemon():
176
    result = rpc.RpcRunner.call_version([node_name])[node_name]
177
    if result.fail_msg:
178
      raise utils.RetryAgain()
179

    
180
  try:
181
    utils.Retry(_CheckNodeDaemon, 1.0, 10.0)
182
  except utils.RetryTimeout:
183
    raise errors.OpExecError("Node daemon on %s didn't answer queries within"
184
                             " 10 seconds" % node_name)
185

    
186

    
187
def _InitFileStorage(file_storage_dir):
188
  """Initialize if needed the file storage.
189

190
  @param file_storage_dir: the user-supplied value
191
  @return: either empty string (if file storage was disabled at build
192
      time) or the normalized path to the storage directory
193

194
  """
195
  if not constants.ENABLE_FILE_STORAGE:
196
    return ""
197

    
198
  file_storage_dir = os.path.normpath(file_storage_dir)
199

    
200
  if not os.path.isabs(file_storage_dir):
201
    raise errors.OpPrereqError("The file storage directory you passed is"
202
                               " not an absolute path.", errors.ECODE_INVAL)
203

    
204
  if not os.path.exists(file_storage_dir):
205
    try:
206
      os.makedirs(file_storage_dir, 0750)
207
    except OSError, err:
208
      raise errors.OpPrereqError("Cannot create file storage directory"
209
                                 " '%s': %s" % (file_storage_dir, err),
210
                                 errors.ECODE_ENVIRON)
211

    
212
  if not os.path.isdir(file_storage_dir):
213
    raise errors.OpPrereqError("The file storage directory '%s' is not"
214
                               " a directory." % file_storage_dir,
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                               errors.ECODE_ENVIRON)
216
  return file_storage_dir
217

    
218

    
219
#pylint: disable-msg=R0913
220
def InitCluster(cluster_name, mac_prefix,
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                master_netdev, file_storage_dir, candidate_pool_size,
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                secondary_ip=None, vg_name=None, beparams=None,
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                nicparams=None, hvparams=None, enabled_hypervisors=None,
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                modify_etc_hosts=True, modify_ssh_setup=True,
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                maintain_node_health=False, drbd_helper=None,
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                uid_pool=None, default_iallocator=None,
227
                primary_ip_version=None):
228
  """Initialise the cluster.
229

230
  @type candidate_pool_size: int
231
  @param candidate_pool_size: master candidate pool size
232

233
  """
234
  # TODO: complete the docstring
235
  if config.ConfigWriter.IsCluster():
236
    raise errors.OpPrereqError("Cluster is already initialised",
237
                               errors.ECODE_STATE)
238

    
239
  if not enabled_hypervisors:
240
    raise errors.OpPrereqError("Enabled hypervisors list must contain at"
241
                               " least one member", errors.ECODE_INVAL)
242
  invalid_hvs = set(enabled_hypervisors) - constants.HYPER_TYPES
243
  if invalid_hvs:
244
    raise errors.OpPrereqError("Enabled hypervisors contains invalid"
245
                               " entries: %s" % invalid_hvs,
246
                               errors.ECODE_INVAL)
247

    
248

    
249
  ipcls = None
250
  if primary_ip_version == constants.IP4_VERSION:
251
    ipcls = netutils.IP4Address
252
  elif primary_ip_version == constants.IP6_VERSION:
253
    ipcls = netutils.IP6Address
254
  else:
255
    raise errors.OpPrereqError("Invalid primary ip version: %d." %
256
                               primary_ip_version)
257

    
258
  hostname = netutils.GetHostname(family=ipcls.family)
259
  if not ipcls.IsValid(hostname.ip):
260
    raise errors.OpPrereqError("This host's IP (%s) is not a valid IPv%d"
261
                               " address." % (hostname.ip, primary_ip_version))
262

    
263
  if ipcls.IsLoopback(hostname.ip):
264
    raise errors.OpPrereqError("This host's IP (%s) resolves to a loopback"
265
                               " address. Please fix DNS or %s." %
266
                               (hostname.ip, constants.ETC_HOSTS),
267
                               errors.ECODE_ENVIRON)
268

    
269
  if not ipcls.Own(hostname.ip):
270
    raise errors.OpPrereqError("Inconsistency: this host's name resolves"
271
                               " to %s,\nbut this ip address does not"
272
                               " belong to this host. Aborting." %
273
                               hostname.ip, errors.ECODE_ENVIRON)
274

    
275
  clustername = netutils.GetHostname(name=cluster_name, family=ipcls.family)
276

    
277
  if netutils.TcpPing(clustername.ip, constants.DEFAULT_NODED_PORT, timeout=5):
278
    raise errors.OpPrereqError("Cluster IP already active. Aborting.",
279
                               errors.ECODE_NOTUNIQUE)
280

    
281
  if not secondary_ip:
282
    if primary_ip_version == constants.IP6_VERSION:
283
      raise errors.OpPrereqError("When using a IPv6 primary address, a valid"
284
                                 " IPv4 address must be given as secondary."
285
                                 " Aborting.", errors.ECODE_INVAL)
286
    secondary_ip = hostname.ip
287

    
288
  if not netutils.IP4Address.IsValid(secondary_ip):
289
    raise errors.OpPrereqError("Secondary IP address (%s) has to be a valid"
290
                               " IPv4 address." % secondary_ip,
291
                               errors.ECODE_INVAL)
292

    
293
  if not netutils.IP4Address.Own(secondary_ip):
294
    raise errors.OpPrereqError("You gave %s as secondary IP,"
295
                               " but it does not belong to this host." %
296
                               secondary_ip, errors.ECODE_ENVIRON)
297

    
298
  if vg_name is not None:
299
    # Check if volume group is valid
300
    vgstatus = utils.CheckVolumeGroupSize(utils.ListVolumeGroups(), vg_name,
301
                                          constants.MIN_VG_SIZE)
302
    if vgstatus:
303
      raise errors.OpPrereqError("Error: %s\nspecify --no-lvm-storage if"
304
                                 " you are not using lvm" % vgstatus,
305
                                 errors.ECODE_INVAL)
306

    
307
  if drbd_helper is not None:
308
    try:
309
      curr_helper = bdev.BaseDRBD.GetUsermodeHelper()
310
    except errors.BlockDeviceError, err:
311
      raise errors.OpPrereqError("Error while checking drbd helper"
312
                                 " (specify --no-drbd-storage if you are not"
313
                                 " using drbd): %s" % str(err),
314
                                 errors.ECODE_ENVIRON)
315
    if drbd_helper != curr_helper:
316
      raise errors.OpPrereqError("Error: requiring %s as drbd helper but %s"
317
                                 " is the current helper" % (drbd_helper,
318
                                                             curr_helper),
319
                                 errors.ECODE_INVAL)
320

    
321
  file_storage_dir = _InitFileStorage(file_storage_dir)
322

    
323
  if not re.match("^[0-9a-z]{2}:[0-9a-z]{2}:[0-9a-z]{2}$", mac_prefix):
324
    raise errors.OpPrereqError("Invalid mac prefix given '%s'" % mac_prefix,
325
                               errors.ECODE_INVAL)
326

    
327
  result = utils.RunCmd(["ip", "link", "show", "dev", master_netdev])
328
  if result.failed:
329
    raise errors.OpPrereqError("Invalid master netdev given (%s): '%s'" %
330
                               (master_netdev,
331
                                result.output.strip()), errors.ECODE_INVAL)
332

    
333
  dirs = [(constants.RUN_GANETI_DIR, constants.RUN_DIRS_MODE)]
334
  utils.EnsureDirs(dirs)
335

    
336
  utils.ForceDictType(beparams, constants.BES_PARAMETER_TYPES)
337
  utils.ForceDictType(nicparams, constants.NICS_PARAMETER_TYPES)
338
  objects.NIC.CheckParameterSyntax(nicparams)
339

    
340
  # hvparams is a mapping of hypervisor->hvparams dict
341
  for hv_name, hv_params in hvparams.iteritems():
342
    utils.ForceDictType(hv_params, constants.HVS_PARAMETER_TYPES)
343
    hv_class = hypervisor.GetHypervisor(hv_name)
344
    hv_class.CheckParameterSyntax(hv_params)
345

    
346
  # set up ssh config and /etc/hosts
347
  sshline = utils.ReadFile(constants.SSH_HOST_RSA_PUB)
348
  sshkey = sshline.split(" ")[1]
349

    
350
  if modify_etc_hosts:
351
    utils.AddHostToEtcHosts(hostname)
352

    
353
  if modify_ssh_setup:
354
    _InitSSHSetup()
355

    
356
  if default_iallocator is not None:
357
    alloc_script = utils.FindFile(default_iallocator,
358
                                  constants.IALLOCATOR_SEARCH_PATH,
359
                                  os.path.isfile)
360
    if alloc_script is None:
361
      raise errors.OpPrereqError("Invalid default iallocator script '%s'"
362
                                 " specified" % default_iallocator,
363
                                 errors.ECODE_INVAL)
364

    
365
  now = time.time()
366

    
367
  # init of cluster config file
368
  cluster_config = objects.Cluster(
369
    serial_no=1,
370
    rsahostkeypub=sshkey,
371
    highest_used_port=(constants.FIRST_DRBD_PORT - 1),
372
    mac_prefix=mac_prefix,
373
    volume_group_name=vg_name,
374
    tcpudp_port_pool=set(),
375
    master_node=hostname.name,
376
    master_ip=clustername.ip,
377
    master_netdev=master_netdev,
378
    cluster_name=clustername.name,
379
    file_storage_dir=file_storage_dir,
380
    enabled_hypervisors=enabled_hypervisors,
381
    beparams={constants.PP_DEFAULT: beparams},
382
    nicparams={constants.PP_DEFAULT: nicparams},
383
    hvparams=hvparams,
384
    candidate_pool_size=candidate_pool_size,
385
    modify_etc_hosts=modify_etc_hosts,
386
    modify_ssh_setup=modify_ssh_setup,
387
    uid_pool=uid_pool,
388
    ctime=now,
389
    mtime=now,
390
    uuid=utils.NewUUID(),
391
    maintain_node_health=maintain_node_health,
392
    drbd_usermode_helper=drbd_helper,
393
    default_iallocator=default_iallocator,
394
    primary_ip_family=ipcls.family,
395
    )
396
  master_node_config = objects.Node(name=hostname.name,
397
                                    primary_ip=hostname.ip,
398
                                    secondary_ip=secondary_ip,
399
                                    serial_no=1,
400
                                    master_candidate=True,
401
                                    offline=False, drained=False,
402
                                    )
403
  InitConfig(constants.CONFIG_VERSION, cluster_config, master_node_config)
404
  cfg = config.ConfigWriter(offline=True)
405
  ssh.WriteKnownHostsFile(cfg, constants.SSH_KNOWN_HOSTS_FILE)
406
  cfg.Update(cfg.GetClusterInfo(), logging.error)
407
  backend.WriteSsconfFiles(cfg.GetSsconfValues())
408

    
409
  # set up the inter-node password and certificate
410
  _InitGanetiServerSetup(hostname.name)
411

    
412
  # start the master ip
413
  # TODO: Review rpc call from bootstrap
414
  # TODO: Warn on failed start master
415
  rpc.RpcRunner.call_node_start_master(hostname.name, True, False)
416

    
417

    
418
def InitConfig(version, cluster_config, master_node_config,
419
               cfg_file=constants.CLUSTER_CONF_FILE):
420
  """Create the initial cluster configuration.
421

422
  It will contain the current node, which will also be the master
423
  node, and no instances.
424

425
  @type version: int
426
  @param version: configuration version
427
  @type cluster_config: L{objects.Cluster}
428
  @param cluster_config: cluster configuration
429
  @type master_node_config: L{objects.Node}
430
  @param master_node_config: master node configuration
431
  @type cfg_file: string
432
  @param cfg_file: configuration file path
433

434
  """
435
  nodes = {
436
    master_node_config.name: master_node_config,
437
    }
438

    
439
  now = time.time()
440
  config_data = objects.ConfigData(version=version,
441
                                   cluster=cluster_config,
442
                                   nodes=nodes,
443
                                   instances={},
444
                                   serial_no=1,
445
                                   ctime=now, mtime=now)
446
  utils.WriteFile(cfg_file,
447
                  data=serializer.Dump(config_data.ToDict()),
448
                  mode=0600)
449

    
450

    
451
def FinalizeClusterDestroy(master):
452
  """Execute the last steps of cluster destroy
453

454
  This function shuts down all the daemons, completing the destroy
455
  begun in cmdlib.LUDestroyOpcode.
456

457
  """
458
  cfg = config.ConfigWriter()
459
  modify_ssh_setup = cfg.GetClusterInfo().modify_ssh_setup
460
  result = rpc.RpcRunner.call_node_stop_master(master, True)
461
  msg = result.fail_msg
462
  if msg:
463
    logging.warning("Could not disable the master role: %s", msg)
464
  result = rpc.RpcRunner.call_node_leave_cluster(master, modify_ssh_setup)
465
  msg = result.fail_msg
466
  if msg:
467
    logging.warning("Could not shutdown the node daemon and cleanup"
468
                    " the node: %s", msg)
469

    
470

    
471
def SetupNodeDaemon(cluster_name, node, ssh_key_check):
472
  """Add a node to the cluster.
473

474
  This function must be called before the actual opcode, and will ssh
475
  to the remote node, copy the needed files, and start ganeti-noded,
476
  allowing the master to do the rest via normal rpc calls.
477

478
  @param cluster_name: the cluster name
479
  @param node: the name of the new node
480
  @param ssh_key_check: whether to do a strict key check
481

482
  """
483
  family = ssconf.SimpleStore().GetPrimaryIPFamily()
484
  sshrunner = ssh.SshRunner(cluster_name,
485
                            ipv6=family==netutils.IP6Address.family)
486

    
487
  noded_cert = utils.ReadFile(constants.NODED_CERT_FILE)
488
  rapi_cert = utils.ReadFile(constants.RAPI_CERT_FILE)
489
  confd_hmac_key = utils.ReadFile(constants.CONFD_HMAC_KEY)
490

    
491
  # in the base64 pem encoding, neither '!' nor '.' are valid chars,
492
  # so we use this to detect an invalid certificate; as long as the
493
  # cert doesn't contain this, the here-document will be correctly
494
  # parsed by the shell sequence below. HMAC keys are hexadecimal strings,
495
  # so the same restrictions apply.
496
  for content in (noded_cert, rapi_cert, confd_hmac_key):
497
    if re.search('^!EOF\.', content, re.MULTILINE):
498
      raise errors.OpExecError("invalid SSL certificate or HMAC key")
499

    
500
  if not noded_cert.endswith("\n"):
501
    noded_cert += "\n"
502
  if not rapi_cert.endswith("\n"):
503
    rapi_cert += "\n"
504
  if not confd_hmac_key.endswith("\n"):
505
    confd_hmac_key += "\n"
506

    
507
  bind_address = constants.IP4_ADDRESS_ANY
508
  if family == netutils.IP6Address.family:
509
    bind_address = constants.IP6_ADDRESS_ANY
510

    
511
  # set up inter-node password and certificate and restarts the node daemon
512
  # and then connect with ssh to set password and start ganeti-noded
513
  # note that all the below variables are sanitized at this point,
514
  # either by being constants or by the checks above
515
  # TODO: Could this command exceed a shell's maximum command length?
516
  mycommand = ("umask 077 && "
517
               "cat > '%s' << '!EOF.' && \n"
518
               "%s!EOF.\n"
519
               "cat > '%s' << '!EOF.' && \n"
520
               "%s!EOF.\n"
521
               "cat > '%s' << '!EOF.' && \n"
522
               "%s!EOF.\n"
523
               "chmod 0400 %s %s %s && "
524
               "%s start %s -b '%s'" %
525
               (constants.NODED_CERT_FILE, noded_cert,
526
                constants.RAPI_CERT_FILE, rapi_cert,
527
                constants.CONFD_HMAC_KEY, confd_hmac_key,
528
                constants.NODED_CERT_FILE, constants.RAPI_CERT_FILE,
529
                constants.CONFD_HMAC_KEY,
530
                constants.DAEMON_UTIL, constants.NODED, bind_address))
531

    
532
  result = sshrunner.Run(node, 'root', mycommand, batch=False,
533
                         ask_key=ssh_key_check,
534
                         use_cluster_key=False,
535
                         strict_host_check=ssh_key_check)
536
  if result.failed:
537
    raise errors.OpExecError("Remote command on node %s, error: %s,"
538
                             " output: %s" %
539
                             (node, result.fail_reason, result.output))
540

    
541
  _WaitForNodeDaemon(node)
542

    
543

    
544
def MasterFailover(no_voting=False):
545
  """Failover the master node.
546

547
  This checks that we are not already the master, and will cause the
548
  current master to cease being master, and the non-master to become
549
  new master.
550

551
  @type no_voting: boolean
552
  @param no_voting: force the operation without remote nodes agreement
553
                      (dangerous)
554

555
  """
556
  sstore = ssconf.SimpleStore()
557

    
558
  old_master, new_master = ssconf.GetMasterAndMyself(sstore)
559
  node_list = sstore.GetNodeList()
560
  mc_list = sstore.GetMasterCandidates()
561

    
562
  if old_master == new_master:
563
    raise errors.OpPrereqError("This commands must be run on the node"
564
                               " where you want the new master to be."
565
                               " %s is already the master" %
566
                               old_master, errors.ECODE_INVAL)
567

    
568
  if new_master not in mc_list:
569
    mc_no_master = [name for name in mc_list if name != old_master]
570
    raise errors.OpPrereqError("This node is not among the nodes marked"
571
                               " as master candidates. Only these nodes"
572
                               " can become masters. Current list of"
573
                               " master candidates is:\n"
574
                               "%s" % ('\n'.join(mc_no_master)),
575
                               errors.ECODE_STATE)
576

    
577
  if not no_voting:
578
    vote_list = GatherMasterVotes(node_list)
579

    
580
    if vote_list:
581
      voted_master = vote_list[0][0]
582
      if voted_master is None:
583
        raise errors.OpPrereqError("Cluster is inconsistent, most nodes did"
584
                                   " not respond.", errors.ECODE_ENVIRON)
585
      elif voted_master != old_master:
586
        raise errors.OpPrereqError("I have a wrong configuration, I believe"
587
                                   " the master is %s but the other nodes"
588
                                   " voted %s. Please resync the configuration"
589
                                   " of this node." %
590
                                   (old_master, voted_master),
591
                                   errors.ECODE_STATE)
592
  # end checks
593

    
594
  rcode = 0
595

    
596
  logging.info("Setting master to %s, old master: %s", new_master, old_master)
597

    
598
  result = rpc.RpcRunner.call_node_stop_master(old_master, True)
599
  msg = result.fail_msg
600
  if msg:
601
    logging.error("Could not disable the master role on the old master"
602
                 " %s, please disable manually: %s", old_master, msg)
603

    
604
  master_ip = sstore.GetMasterIP()
605
  total_timeout = 30
606
  # Here we have a phase where no master should be running
607
  def _check_ip():
608
    if netutils.TcpPing(master_ip, constants.DEFAULT_NODED_PORT):
609
      raise utils.RetryAgain()
610

    
611
  try:
612
    utils.Retry(_check_ip, (1, 1.5, 5), total_timeout)
613
  except utils.RetryTimeout:
614
    logging.warning("The master IP is still reachable after %s seconds,"
615
                    " continuing but activating the master on the current"
616
                    " node will probably fail", total_timeout)
617

    
618
  # instantiate a real config writer, as we now know we have the
619
  # configuration data
620
  cfg = config.ConfigWriter()
621

    
622
  cluster_info = cfg.GetClusterInfo()
623
  cluster_info.master_node = new_master
624
  # this will also regenerate the ssconf files, since we updated the
625
  # cluster info
626
  cfg.Update(cluster_info, logging.error)
627

    
628
  result = rpc.RpcRunner.call_node_start_master(new_master, True, no_voting)
629
  msg = result.fail_msg
630
  if msg:
631
    logging.error("Could not start the master role on the new master"
632
                  " %s, please check: %s", new_master, msg)
633
    rcode = 1
634

    
635
  return rcode
636

    
637

    
638
def GetMaster():
639
  """Returns the current master node.
640

641
  This is a separate function in bootstrap since it's needed by
642
  gnt-cluster, and instead of importing directly ssconf, it's better
643
  to abstract it in bootstrap, where we do use ssconf in other
644
  functions too.
645

646
  """
647
  sstore = ssconf.SimpleStore()
648

    
649
  old_master, _ = ssconf.GetMasterAndMyself(sstore)
650

    
651
  return old_master
652

    
653

    
654
def GatherMasterVotes(node_list):
655
  """Check the agreement on who is the master.
656

657
  This function will return a list of (node, number of votes), ordered
658
  by the number of votes. Errors will be denoted by the key 'None'.
659

660
  Note that the sum of votes is the number of nodes this machine
661
  knows, whereas the number of entries in the list could be different
662
  (if some nodes vote for another master).
663

664
  We remove ourselves from the list since we know that (bugs aside)
665
  since we use the same source for configuration information for both
666
  backend and boostrap, we'll always vote for ourselves.
667

668
  @type node_list: list
669
  @param node_list: the list of nodes to query for master info; the current
670
      node will be removed if it is in the list
671
  @rtype: list
672
  @return: list of (node, votes)
673

674
  """
675
  myself = netutils.Hostname.GetSysName()
676
  try:
677
    node_list.remove(myself)
678
  except ValueError:
679
    pass
680
  if not node_list:
681
    # no nodes left (eventually after removing myself)
682
    return []
683
  results = rpc.RpcRunner.call_master_info(node_list)
684
  if not isinstance(results, dict):
685
    # this should not happen (unless internal error in rpc)
686
    logging.critical("Can't complete rpc call, aborting master startup")
687
    return [(None, len(node_list))]
688
  votes = {}
689
  for node in results:
690
    nres = results[node]
691
    data = nres.payload
692
    msg = nres.fail_msg
693
    fail = False
694
    if msg:
695
      logging.warning("Error contacting node %s: %s", node, msg)
696
      fail = True
697
    elif not isinstance(data, (tuple, list)) or len(data) < 3:
698
      logging.warning("Invalid data received from node %s: %s", node, data)
699
      fail = True
700
    if fail:
701
      if None not in votes:
702
        votes[None] = 0
703
      votes[None] += 1
704
      continue
705
    master_node = data[2]
706
    if master_node not in votes:
707
      votes[master_node] = 0
708
    votes[master_node] += 1
709

    
710
  vote_list = [v for v in votes.items()]
711
  # sort first on number of votes then on name, since we want None
712
  # sorted later if we have the half of the nodes not responding, and
713
  # half voting all for the same master
714
  vote_list.sort(key=lambda x: (x[1], x[0]), reverse=True)
715

    
716
  return vote_list