Synnefo » snf-ganeti » ganeti-local

def _CheckOSParams(lu, required, nodenames, osname, osparams):

  """OS parameters validation.

  @type lu: L{LogicalUnit}

  @param lu: the logical unit for which we check

  @type required: boolean

  @param required: whether the validation should fail if the OS is not

      found

  @type nodenames: list

  @param nodenames: the list of nodes on which we should check

  @type osname: string

  @param osname: the name of the hypervisor we should use

  @type osparams: dict

  @param osparams: the parameters which we need to check

  @raise errors.OpPrereqError: if the parameters are not valid

  """

  result = lu.rpc.call_os_validate(required, nodenames, osname,

                                   [constants.OS_VALIDATE_PARAMETERS],

                                   osparams)

  for node, nres in result.items():

    # we don't check for offline cases since this should be run only

    # against the master node and/or an instance's nodes

    nres.Raise("OS Parameters validation failed on node %s" % node)

    if not nres.payload:

      lu.LogInfo("OS %s not found on node %s, validation skipped",

                 osname, node)