From http://stackoverflow.com/questions/12826723/possible-to-extract-the-git-repo-revision-hash-via-python-code

gitVersion.py

def git_version():
    from subprocess import Popen, PIPE
    gitproc = Popen(['git', 'rev-parse','HEAD'], stdout = PIPE)
    (stdout, _) = gitproc.communicate()
    return stdout.strip()