Clones the given repos in temp directories
    :param session: requests Session instance
    :param urls: list, str URLs
    :return: tuple, (str -> directory, str -> URL)

def clone_repo(session, urls):
    """
    Clones the given repos in temp directories
    :param session: requests Session instance
    :param urls: list, str URLs
    :return: tuple, (str -> directory, str -> URL)
    """
    repos = []
    for url in urls:
        dir = mkdtemp()
        call = ["git", "clone", url, dir]
        subprocess.call(call)
        repos.append((dir, url))
    return repos