void tgzTo(TestFile tarFile, boolean readOnly) {
        Tar tar = new Tar()
        tar.setProject(new Project())
        setSourceDirectory(tar, readOnly)
        tar.setDestFile(tarFile)
        tar.setCompression((Tar.TarCompressionMethod) EnumeratedAttribute.getInstance(Tar.TarCompressionMethod.class, "gzip"))
        tar.execute()
    }

    void tbzTo(TestFile tarFile, boolean readOnly) {
        Tar tar = new Tar()