def _CheckLUResult(self, op, result):
    resultcheck_fn = op.OP_RESULT
    if not (resultcheck_fn is None or resultcheck_fn(result)):
      logging.error("Expected opcode result matching %s, got %s",
                    resultcheck_fn, result)
      if not getattr(op, "dry_run", False):
        # FIXME: LUs should still behave in dry_run mode, or
        # alternately we should have OP_DRYRUN_RESULT; in the
        # meantime, we simply skip the OP_RESULT check in dry-run mode
        raise errors.OpResultError("Opcode result does not match %s: %s" %
                                   (resultcheck_fn, utils.Truncate(result, 80)))
Check the LU result against the contract in the opcode.
dataset/ETHPy150Open ganeti/ganeti/lib/mcpu.py/Processor._CheckLUResult