git post-receive example implemented in python.

post-receive

#!/usr/local/bin/python
# -*- coding: utf-8; mode: python -*-

import os
import os.path
import sys
import subprocess

WORK_DIR = '/path/to/work/dir'
GIT_DIR  = os.path.join(WORK_DIR, '.git')

def main():  
  hash1, hash2, ref = sys.stdin.readline().split()
  if ref == 'refs/heads/release':
    os.chdir(WORK_DIR)
    subprocess.check_call(['git', '--git-dir={0}'.format(GIT_DIR), 'pull'])
    # Do something
  return

if __name__ == '__main__':
  main()