#!/usr/bin/python
"""homeunison.py"""

import os, sys, time

lockfile = "/tmp/homeunison.lock"
locked = 0

for i in range(100):

    if locked:
        break
       
    try:
        if not os.path.exists(lockfile):
            open(lockfile, "w").write("%d" % os.getpid())
            print i, "Wrote pid to file"
            continue
    except:
        pass       
           
    try:
        if os.path.exists(lockfile):
            pid = open(lockfile).readline()
            if int(pid) == os.getpid():
                locked = 1
                print i, "Initiated lock"
                continue
    except:
        pass   
     
    try:
        if os.path.exists("/proc/%s" % pid):
            cmdline = open("/proc/%s/cmdline" % pid).readline()
            if not "homeunison" in cmdline:
                os.remove(lockfile)
                print i, "Removed stale lockfile"
                continue
        else:
            os.remove(lockfile)
            print i, "Removed stale lockfile"
            continue
            
    except:
        pass
   
    time.sleep(0.15)

if locked:
    print os.getpid(), "Wootadoo"
    time.sleep(30)
    
    try:
        os.remove(lockfile)
    except:
        pass