VCS - Mercurial - Get revision number for a given path in local checkout

get_hg_path_revision.py

def get_hg_path_revision(path):
    """return latest modification revision of a path inside hg

       :raise:  EnvironmentError if `hg` isn't found or path invalid
       :return: string like 'num:hash'
    """
    from subprocess import Popen, PIPE
    try:
        hgprocess = Popen(
            'hg log -l 1 --template "{node|short} {rev}" --cwd "%s" "%s"'
                % (os.path.dirname(path) or '.', os.path.basename(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")