Dead simple process watcher in python. Restarts a process if and only if it dies with a non-zero exit code. Shuts down if process exits with zero.

watcher.py

#!/usr/bin/env python

import sys
import os

# Dead simple process watcher in python.
# Restarts a process if and only if it dies with a non-zero exit code.
# Shuts down if process exits with zero.

if __name__ == "__main__":
    if len(sys.argv) == 1:
        print "Usage: watcher.py <program> <args>"
    else:
        result = os.system(" ".join(sys.argv[1:]))
        while result != 0:
            print "Bootstrap restarting process!"
            result = os.system(" ".join(sys.argv[1:]))