Beispiel #1
0
func writeTarFromLayer(r hcsshim.LayerReader, w io.Writer) error {
	t := tar.NewWriter(w)
	for {
		name, size, fileInfo, err := r.Next()
		if err == io.EOF {
			break
		}
		if err != nil {
			return err
		}
		if fileInfo == nil {
			// Write a whiteout file.
			hdr := &tar.Header{
				Name: filepath.ToSlash(filepath.Join(filepath.Dir(name), archive.WhiteoutPrefix+filepath.Base(name))),
			}
			err := t.WriteHeader(hdr)
			if err != nil {
				return err
			}
		} else {
			err = backuptar.WriteTarFileFromBackupStream(t, r, name, size, fileInfo)
			if err != nil {
				return err
			}
		}
	}
	return t.Close()
}
Beispiel #2
0
func TestRoundTrip(t *testing.T) {
	f, err := ioutil.TempFile("", "tst")
	if err != nil {
		t.Fatal(err)
	}
	defer f.Close()
	defer os.Remove(f.Name())

	if _, err = f.Write([]byte("testing 1 2 3\n")); err != nil {
		t.Fatal(err)
	}

	if _, err = f.Seek(0, 0); err != nil {
		t.Fatal(err)
	}

	fi, err := f.Stat()
	if err != nil {
		t.Fatal(err)
	}

	bi, err := winio.GetFileBasicInfo(f)
	if err != nil {
		t.Fatal(err)
	}

	br := winio.NewBackupFileReader(f, true)
	defer br.Close()

	var buf bytes.Buffer
	tw := tar.NewWriter(&buf)

	err = WriteTarFileFromBackupStream(tw, br, f.Name(), fi.Size(), bi)
	if err != nil {
		t.Fatal(err)
	}

	tr := tar.NewReader(&buf)
	hdr, err := tr.Next()
	if err != nil {
		t.Fatal(err)
	}

	name, size, bi2, err := FileInfoFromHeader(hdr)
	if err != nil {
		t.Fatal(err)
	}

	if name != filepath.ToSlash(f.Name()) {
		t.Errorf("got name %s, expected %s", name, filepath.ToSlash(f.Name()))
	}

	if size != fi.Size() {
		t.Errorf("got size %d, expected %d", size, fi.Size())
	}

	if !reflect.DeepEqual(*bi, *bi2) {
		t.Errorf("got %#v, expected %#v", *bi, *bi2)
	}

	ensurePresent(t, hdr.Winheaders, "fileattr", "sd")
}