}
    }

    private static void cloneRepo(File workingDir, GitVersionControlSpec gitSpec, VersionRef ref) {
        Git git = null;
        try {
            CloneCommand clone = configureTransport(Git.cloneRepository()).
                    setURI(normalizeUri(gitSpec.getUrl())).
                    setDirectory(workingDir).
                    setCloneSubmodules(true);
            git = clone.call();