#!/usr/bin/python


"""Run a command until it succeeds.

Lars Wirzenius <liw@liw.fi>
"""


import subprocess
import sys
import time


def do_until(argv):
    while True:
        p = subprocess.Popen(argv)
        p.communicate()
        if p.returncode == 0:
            break
        sys.stderr.write("do-until: command failed, "
                         "trying again in 1 second\n")
        time.sleep(1)


def main():
    argv = sys.argv[1:]
    if argv:
        do_until(argv)


if __name__ == "__main__":
    main()