then:
        file("build/child").mode == 0777
        file("build/child/reference.txt").mode == 0746
        where:
        taskName | unpackMethod
        "Zip"    | "unzipTo"
        "Tar"    | "untarTo"
    }

    @Requires(UnitTestPreconditions.FilePermissions)
    def "file and directory permissions can be overridden in #taskName task"() {
        given:
        createDir('parent') {
            child {

        def tgzCacheEntry = temporaryFolder.file("cache.tgz")
        cacheEntry.copyBytesTo(tgzCacheEntry)
        def extractDir = temporaryFolder.file("extract")
        tgzCacheEntry.untarTo(extractDir)
        tgzCacheEntry.delete()

        def metadata = new Properties()
        extractDir.file("METADATA").withInputStream { input ->
            metadata.load(input)
        }

    }

    private void tarAndUntarAndCheckFileContents(TestFile tarFile) {
        tar(file("dir/file1"), file("file2"))

        TestFile expandDir = temporaryFolder.getTestDirectory().file("expanded")
        tarFile.untarTo(expandDir)
        expandDir.file("dir/file1").assertContents(equalTo("contents of dir/file1"))
        expandDir.file("file2").assertContents(equalTo("contents of file2"))
    }

            def tgzCacheEntry = temporaryFolder.file("cache.tgz")
            cacheEntry.copyTo(tgzCacheEntry)
            def extractDir = temporaryFolder.file("extract")
            tgzCacheEntry.untarTo(extractDir)
            tgzCacheEntry.delete()

            def metadataFile = extractDir.file("METADATA")
            if (matcher.test(metadataFile)) {
                println "> Corrupting $cacheEntry..."

		return d.r.Read(p)
	}
	return 0, errors.New("reader closed")
}

func (d *disconnectReader) Close() error {
	d.mu.Lock()
	d.r = nil
	d.mu.Unlock()
	return nil
}

func untar(ctx context.Context, r io.Reader, putObject func(reader io.Reader, info os.FileInfo, name string) error, o untarOptions) error {
	bf := bufio.NewReader(r)
	switch f := detect(bf); f {
	case formatGzip:

#
# This file will be fetched as: curl -L https://git.io/getLatestIstio | sh -
# so it should be pure bourne shell, not bash (and not reference other scripts)
#
# The script fetches the latest Istio release candidate and untars it.
# You can pass variables on the command line to download a specific version
# or to override the processor architecture. For example, to download
# Istio 1.6.8 for the x86_64 architecture and linux OS,