VCS - Mercurial - Get revision number for a given repository

get_hg_repo_revision.py

def get_hg_repo_revision(path):
    """return current revision of a repository at path

       :raise:  EnvironmentError if `hg` isn't found or path invalid
       :return: string like 'num:hash'
    """
    from subprocess import Popen, PIPE
    if os.path.isfile(path):
        path = os.path.dirname(path)
    try:
        hgprocess = Popen('hg id -ni "%s"' % path, shell=True,
                          stdout=PIPE, stderr=PIPE)
        output = hgprocess.communicate()
        if hgprocess.returncode != 0:
            raise EnvironmentError(hgprocess.returncode, "'hg' returned error")
        hgid, hgnum = output[0].strip().split()
        return hgnum + ':' + hgid
    except OSError:
        raise EnvironmentError(2, "'hg' command not found")