Check if a file is tracked by git

path_is_in_git.py

def path_is_in_git(repo, path):
    """ 
    Check if path is tracked by git.
    """
    returncode = None
    try:
        cmd = 'git ls-files --error-unmatch %s' % (path)
        _ = subprocess.check_output(cmd,
                cwd=repo,
                shell=True,
                stderr=subprocess.DEVNULL)
        returncode = 0 
    except subprocess.CalledProcessError as e:
        returncode = e.returncode
    return returncode == 0