Synnefo » snf-ganeti

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)

  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