Synnefo » snf-ganeti

def ValidateDeviceNames(kind, container):

  """Validate instance device names.

  Check that a device container contains only unique and valid names.

  @type kind: string

  @param kind: One-word item description

  @type container: list

  @param container: Container containing the devices

  """

  valid = []

  for device in container:

    if isinstance(device, dict):

      if kind == "NIC":

        name = device.get(constants.INIC_NAME, None)

      elif kind == "disk":

        name = device.get(constants.IDISK_NAME, None)

      else:

        raise errors.OpPrereqError("Invalid container kind '%s'" % kind,

                                   errors.ECODE_INVAL)

    else:

      name = device.name

      # Check that a device name is not the UUID of another device

      valid.append(device.uuid)

    try:

      int(name)

    except (ValueError, TypeError):

      pass

    else:

      raise errors.OpPrereqError("Invalid name '%s'. Purely numeric %s names"

                                 " are not allowed" % (name, kind),

                                 errors.ECODE_INVAL)

    if name is not None:

      if name in valid:

        raise errors.OpPrereqError("%s name '%s' already used" % (kind, name),

                                   errors.ECODE_NOTUNIQUE)

      else:

        valid.append(name)