post-receive

#!/usr/bin/python

import commands, subprocess, os, sys, re

refpattern = "refs/heads/master"

def print_if_present(s):
	o = s.strip()
	if (len(o) > 0):
		print(o)

def run_cmd(cmd):
	pr = subprocess.Popen(cmd, shell = True, stdout = subprocess.PIPE, stderr = subprocess.PIPE)
	return pr.communicate()

def run_git_cmd(cmd):
	return run_cmd("git --work-tree=%s %s" % (get_worktree_directory(),cmd))

def git_config_value(key, default=None):
	(out,error) = run_cmd("git config --get %s" % (key))
	out = out.strip()
	if len(out) == 0:
		return default
	if out.lower() == "true":
		return True
	if out.lower() == "false":
		return False
	return out

def get_worktree_directory():
	if git_config_value("core.bare",False):
		return git_config_value("deploy.destination")
	else:
		return os.path.abspath(os.path.join(os.getcwd(),'..'))

def run_deploy_script(working_directory,script_filename):
	del os.environ['GIT_DIR']
	pr = subprocess.Popen(os.path.join(working_directory,script_filename), cwd = working_directory, shell = True, stdout = subprocess.PIPE, stderr = subprocess.PIPE)
	return pr.communicate()

def run_deploy(oldrev, newrev, refname):
	script = git_config_value("deploy.script",None)

	print("Resetting tree to pushed version (%s)." % (newrev))

	(out, error) = run_git_cmd("reset --hard %s" % (newrev))
	print_if_present(error)
	print_if_present(out)

	if script != None:
		print("Running deployment script.")
		(out, error) = run_deploy_script(get_worktree_directory(),script)
		print_if_present(error)
		print_if_present(out)

if __name__ == '__main__':
	(oldrev, newrev, refname) = sys.stdin.readlines()[0].split()
	if re.match(refpattern, refname):
		run_deploy(oldrev,newrev,refname)