def CheckNodeOnline(lu, node_uuid, msg=None):
  if msg is None:
    msg = "Can't use offline node"
  if lu.cfg.GetNodeInfo(node_uuid).offline:
    raise errors.OpPrereqError("%s: %s" % (msg, lu.cfg.GetNodeName(node_uuid)),
                               errors.ECODE_STATE)
If the result is an error that occurs after all user references to the
dataset/ETHPy150Open ganeti/ganeti/lib/cmdlib/common.py/CheckNodeOnline--crossover with--dataset/ETHPy150Open itamarst/crochet/crochet/tests/test_api.py/EventualResultTests.test_error_after_gc_logged