def git_clone_worker(queue):
    """Worker thread for picking up git clone jobs from $queue until it
    receives None."""
    while True:
        job = queue.get()
        if job is None:
            break
        git_url, path = job
        git_clone(git_url, path)
        queue.task_done()
Worker thread for picking up git clone jobs from $queue until it
    receives None.