~andreserl/maas/qa-lab-tests-bionic

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import errno
from functools import wraps
import os
import signal


class TimeoutError(Exception):
    pass


# From StackOverflow question: "timeout function if it takes too long to
# finish": http://bit.ly/1g1wHpm
def timeout(seconds=10, error_message=os.strerror(errno.ETIME)):
    def decorator(func):
        def _handle_timeout(signum, frame):
            raise TimeoutError(error_message)

        def wrapper(*args, **kwargs):
            signal.signal(signal.SIGALRM, _handle_timeout)
            signal.alarm(seconds)
            try:
                result = func(*args, **kwargs)
            finally:
                signal.alarm(0)
            return result

        return wraps(func)(wrapper)

    return decorator