Python file lock test

lock-test.py

#!/usr/bin/env python
import time
import fcntl

lock_file = "/var/lock/cloudstack_security_group.lock"

lock_handle = None

def obtain_file_lock(path):
    global lock_handle

    try:
        lock_handle = open(path, 'w')
        fcntl.flock(lock_handle, fcntl.LOCK_EX | fcntl.LOCK_NB)
        return True
    except IOError:
        pass

    return False

if obtain_file_lock(lock_file) is False:
    print('Failed to obtain lock!')
else:
    print('Obtained lock')

time.sleep(30)