git post-receive hook for updating Trac 0.12

post-receive

#!/usr/bin/python

import sys
import subprocess

GIT_PATH = '/usr/bin/git'
TRAC_ADMIN_PATH = '/usr/local/bin/trac-admin'

VALID_BRANCHES = ['master']
TRAC_ENV = '/path/to/trac'
REPO_NAME = 'somerepo'

if __name__ == '__main__':
    for line in sys.stdin:
        old, new, ref = line.split()

        if ref.startswith('refs/heads/') and ref[11:] in VALID_BRANCHES:
            args = [new] if old == '0' * 40 else [new, '^' + old]
            pending_commits = subprocess.Popen([GIT_PATH, 'rev-list'] + args, stdout=subprocess.PIPE).communicate()[0].splitlines()[::-1]
            subprocess.call([TRAC_ADMIN_PATH, TRAC_ENV, "changeset", "added", REPO_NAME] + pending_commits)