#!/usr/bin/env python

import fcntl
import os
import sys

import env

import setproctitle

import qnap.tunnelagent.bootstrap.server

# set process name
process_name = os.path.basename(__file__)
setproctitle.setproctitle(process_name)

if __name__ == '__main__':
    # check if already have other process
    lockfile = '/var/run/{}.pid.lck'.format(process_name)
    lockfd = open(lockfile, 'a+')
    try:
        fcntl.flock(lockfd.fileno(), fcntl.LOCK_EX | fcntl.LOCK_NB)
    except IOError:
        sys.exit(0)

    # start process & remove pid file
    pidfile = '/var/run/{}.pid'.format(process_name)
    try:
        pidfd = open(pidfile, 'a+')
        pidfd.write('%d' % os.getpid())
        pidfd.flush()
        sys.exit(qnap.tunnelagent.bootstrap.server.main())
    finally:
        pidfd.close()
        fcntl.flock(lockfd.fileno(), fcntl.LOCK_UN)
        lockfd.close()
        os.unlink(pidfile)
        os.unlink(lockfile)