Synnefo » snf-ganeti

def CheckIpolicyVsDiskTemplates(ipolicy, enabled_disk_templates):

  """Checks ipolicy disk templates against enabled disk tempaltes.

  @type ipolicy: dict

  @param ipolicy: the new ipolicy

  @type enabled_disk_templates: list of string

  @param enabled_disk_templates: list of enabled disk templates on the

    cluster

  @raises errors.OpPrereqError: if there is at least one allowed disk

    template that is not also enabled.

  """

  assert constants.IPOLICY_DTS in ipolicy

  allowed_disk_templates = ipolicy[constants.IPOLICY_DTS]

  not_enabled = set(allowed_disk_templates) - set(enabled_disk_templates)

  if not_enabled:

    raise errors.OpPrereqError("The following disk template are allowed"

                               " by the ipolicy, but not enabled on the"

                               " cluster: %s" % utils.CommaJoin(not_enabled))