Golang aci.NewCompressedTarReader函數代碼示例

func ExtractManifestContentFromAci(aciPath string) ([]byte, error) {
	fields := data.WithField("file", aciPath)
	input, err := os.Open(aciPath)
	if err != nil {
		return nil, errs.WithEF(err, fields, "Cannot open file")
	}
	defer input.Close()

	tr, err := aci.NewCompressedTarReader(input)
	if err != nil {
		return nil, errs.WithEF(err, fields, "Cannot open file as tar")
	}

Tar:
	for {
		hdr, err := tr.Next()
		switch err {
		case io.EOF:
			break Tar
		case nil:
			if filepath.Clean(hdr.Name) == aci.ManifestFile {
				bytes, err := ioutil.ReadAll(tr)
				if err != nil {
					return nil, errs.WithEF(err, fields, "Cannot read manifest content in tar")
				}
				return bytes, nil
			}
		default:
			return nil, errs.WithEF(err, fields, "error reading tarball file")
		}
	}
	return nil, errs.WithEF(err, fields, "Cannot found manifest in file")
}

func runCatManifest(args []string) (exit int) {
	if len(args) != 1 {
		stderr("cat-manifest: Must provide one file")
		return 1
	}

	inputFile = args[0]

	input, err := os.Open(inputFile)
	if err != nil {
		stderr("cat-manifest: Cannot open %s: %v", inputFile, err)
		return 1
	}
	defer input.Close()

	tr, err := aci.NewCompressedTarReader(input)
	if err != nil {
		stderr("cat-manifest: Cannot extract %s: %v", inputFile, err)
		return 1
	}
	defer tr.Close()

	err = extractManifest(tr.Reader, nil, true, nil)
	if err != nil {
		stderr("cat-manifest: Unable to read %s: %v", inputFile, err)
		return 1
	}

	return
}

// overwriteManifest takes an ACI and outputs another with the original manifest
// overwritten by the given manifest.
func overwriteManifest(in io.ReadSeeker, out io.Writer, manifest *schema.ImageManifest) error {
	outTar := tar.NewWriter(out)
	iw := aci.NewImageWriter(*manifest, outTar)
	defer iw.Close()

	tr, err := aci.NewCompressedTarReader(in)
	if err != nil {
		return err
	}

	for {
		hdr, err := tr.Next()
		switch err {
		case io.EOF:
			return nil
		case nil:
			if filepath.Clean(hdr.Name) != aci.ManifestFile {
				if err := iw.AddFile(hdr, tr); err != nil {
					return fmt.Errorf("error writing to image writer: %v", err)
				}
			}
		default:
			return fmt.Errorf("error extracting tarball: %v", err)
		}
	}
}

func Validate(f io.ReadSeeker) error {
	tr, err := specaci.NewCompressedTarReader(f)
	defer tr.Close()
	if err != nil {
		return err
	}

	if err := specaci.ValidateArchive(tr.Reader); err != nil {
		return err
	}
	return nil
}

// Extract expands the ACI file to a temporary directory, returning
// the directory path where the ACI was expanded or an error
func Extract(f io.ReadSeeker) (string, error) {
	fileMode := os.FileMode(0755)

	tr, err := specaci.NewCompressedTarReader(f)
	if err != nil {
		return "", err
	}
	defer tr.Close()

	// Extract archive to temporary directory
	dir, err := ioutil.TempDir("", "")
	if err != nil {
		return "", err
	}
	for {
		hdr, err := tr.Reader.Next()
		if err == io.EOF {
			break
		}
		if err != nil {
			return "", fmt.Errorf("%v\n%v", ErrNext, err)
		}
		file := filepath.Join(dir, hdr.Name)

		switch hdr.Typeflag {
		case tar.TypeReg:
			w, err := os.Create(file)
			if err != nil {
				return "", fmt.Errorf("%v: %v\n%v", ErrCreatingFile, file, err)
			}
			defer w.Close()
			_, err = io.Copy(w, tr)
			if err != nil {
				return "", fmt.Errorf("%v: %v\n%v", ErrCopyingFile, file, err)
			}
			err = os.Chmod(file, fileMode)
			if err != nil {
				return "", fmt.Errorf("%v: %v\n%v", ErrChmod, file, err)
			}
		case tar.TypeDir:
			err = os.MkdirAll(file, fileMode)
			if err != nil {
				return "", fmt.Errorf("%v: %v\n%v", ErrMkdirAll, file, err)
			}
		default:
			return "", fmt.Errorf("%v: %v", ErrUntar, hdr.Name)
		}
	}
	return dir, nil
}

// CatManifest will print to stdout the manifest from the ACI stored at
// aciPath, optionally inserting whitespace to make it more human readable.
func CatManifest(aciPath string, prettyPrint bool) (err error) {
	finfo, err := os.Stat(aciPath)
	switch {
	case os.IsNotExist(err):
		return fmt.Errorf("no such file or directory: %s", aciPath)
	case err != nil:
		return err
	case finfo.IsDir():
		return fmt.Errorf("%s is a directory, not an ACI", aciPath)
	default:
		break
	}

	file, err := os.Open(aciPath)
	if err != nil {
		return err
	}
	defer file.Close()

	tr, err := aci.NewCompressedTarReader(file)
	if err != nil {
		return fmt.Errorf("error decompressing image: %v", err)
	}
	defer tr.Close()

	for {
		hdr, err := tr.Next()
		switch {
		case err == io.EOF:
			return fmt.Errorf("manifest not found in ACI %s", aciPath)
		case err != nil:
			return err
		case hdr.Name == "manifest":
			manblob, err := ioutil.ReadAll(tr)
			if err != nil {
				return err
			}
			var man schema.ImageManifest
			err = man.UnmarshalJSON(manblob)
			if err != nil {
				return err
			}
			return util.PrintManifest(&man, prettyPrint)
		}
	}
}

func ValidateACI(aciPath string) error {
	aciFile, err := os.Open(aciPath)
	if err != nil {
		return err
	}
	defer aciFile.Close()

	reader, err := aci.NewCompressedTarReader(aciFile)
	if err != nil {
		return err
	}

	if err := aci.ValidateArchive(reader); err != nil {
		return err
	}

	return nil
}

func ExtractManifestFromAci(aciPath string) schema.ImageManifest {
	input, err := os.Open(aciPath)
	if err != nil {
		panic("cat-manifest: Cannot open %s: %v" + aciPath + err.Error())
	}
	defer input.Close()

	tr, err := aci.NewCompressedTarReader(input)
	if err != nil {
		panic("cat-manifest: Cannot open tar %s: %v" + aciPath + err.Error())
	}

	im := schema.ImageManifest{}

Tar:
	for {
		hdr, err := tr.Next()
		switch err {
		case io.EOF:
			break Tar
		case nil:
			if filepath.Clean(hdr.Name) == aci.ManifestFile {
				bytes, err := ioutil.ReadAll(tr)
				if err != nil {
					panic(err)
				}

				err = im.UnmarshalJSON(bytes)
				if err != nil {
					panic(err)
				}
				return im
			}
		default:
			panic("error reading tarball: %v" + err.Error())
		}
	}
	panic("Cannot found manifest if aci")
	return im
}

func runValidate(args []string) (exit int) {
	if len(args) < 1 {
		stderr("must pass one or more files")
		return 1
	}

	for _, path := range args {
		vt := valType
		fi, err := os.Stat(path)
		if err != nil {
			stderr("unable to access %s: %v", path, err)
			return 1
		}
		var fh *os.File
		if fi.IsDir() {
			switch vt {
			case typeImageLayout:
			case "":
				vt = typeImageLayout
			case typeManifest, typeAppImage:
				stderr("%s is a directory (wrong --type?)", path)
				return 1
			default:
				// should never happen
				panic(fmt.Sprintf("unexpected type: %v", vt))
			}
		} else {
			fh, err = os.Open(path)
			if err != nil {
				stderr("%s: unable to open: %v", path, err)
				return 1
			}
		}

		if vt == "" {
			vt, err = detectValType(fh)
			if err != nil {
				stderr("%s: error detecting file type: %v", path, err)
				return 1
			}
		}
		switch vt {
		case typeImageLayout:
			err = aci.ValidateLayout(path)
			if err != nil {
				stderr("%s: invalid image layout: %v", path, err)
				exit = 1
			} else if globalFlags.Debug {
				stderr("%s: valid image layout", path)
			}
		case typeAppImage:
			tr, err := aci.NewCompressedTarReader(fh)
			if err != nil {
				stderr("%s: error decompressing file: %v", path, err)
				return 1
			}
			err = aci.ValidateArchive(tr.Reader)
			tr.Close()
			fh.Close()
			if err != nil {
				if e, ok := err.(aci.ErrOldVersion); ok {
					stderr("%s: warning: %v", path, e)
				} else {
					stderr("%s: error validating: %v", path, err)
					exit = 1
				}
			} else if globalFlags.Debug {
				stderr("%s: valid app container image", path)
			}
		case typeManifest:
			b, err := ioutil.ReadAll(fh)
			fh.Close()
			if err != nil {
				stderr("%s: unable to read file %s", path, err)
				return 1
			}
			k := schema.Kind{}
			if err := k.UnmarshalJSON(b); err != nil {
				stderr("%s: error unmarshaling manifest: %v", path, err)
				return 1
			}
			switch k.ACKind {
			case "ImageManifest":
				m := schema.ImageManifest{}
				err = m.UnmarshalJSON(b)
			case "PodManifest":
				m := schema.PodManifest{}
				err = m.UnmarshalJSON(b)
			default:
				// Should not get here; schema.Kind unmarshal should fail
				panic("bad ACKind")
			}
			if err != nil {
				stderr("%s: invalid %s: %v", path, k.ACKind, err)
				exit = 1
			} else if globalFlags.Debug {
				stderr("%s: valid %s", path, k.ACKind)
			}
		default:
			stderr("%s: unable to detect filetype (try --type)", path)
//.........這裏部分代碼省略.........

func writeACI(layer io.ReadSeeker, manifest schema.ImageManifest, curPwl []string, output string, compress bool) (*schema.ImageManifest, error) {
	aciFile, err := os.Create(output)
	if err != nil {
		return nil, fmt.Errorf("error creating ACI file: %v", err)
	}
	defer aciFile.Close()

	var w io.WriteCloser = aciFile
	if compress {
		w = gzip.NewWriter(aciFile)
		defer w.Close()
	}
	trw := tar.NewWriter(w)
	defer trw.Close()

	if err := WriteRootfsDir(trw); err != nil {
		return nil, fmt.Errorf("error writing rootfs entry: %v", err)
	}

	var whiteouts []string
	convWalker := func(t *tarball.TarFile) error {
		name := t.Name()
		if name == "./" {
			return nil
		}
		t.Header.Name = path.Join("rootfs", name)
		absolutePath := strings.TrimPrefix(t.Header.Name, "rootfs")
		if strings.Contains(t.Header.Name, "/.wh.") {
			whiteouts = append(whiteouts, strings.Replace(absolutePath, ".wh.", "", 1))
			return nil
		}
		if t.Header.Typeflag == tar.TypeLink {
			t.Header.Linkname = path.Join("rootfs", t.Linkname())
		}

		if err := trw.WriteHeader(t.Header); err != nil {
			return err
		}
		if _, err := io.Copy(trw, t.TarStream); err != nil {
			return err
		}

		if !util.In(curPwl, absolutePath) {
			curPwl = append(curPwl, absolutePath)
		}

		return nil
	}
	tr, err := aci.NewCompressedTarReader(layer)
	if err == nil {
		defer tr.Close()
		// write files in rootfs/
		if err := tarball.Walk(*tr.Reader, convWalker); err != nil {
			return nil, err
		}
	} else {
		// ignore errors: empty layers in tars generated by docker save are not
		// valid tar files so we ignore errors trying to open them. Converted
		// ACIs will have the manifest and an empty rootfs directory in any
		// case.
	}
	newPwl := subtractWhiteouts(curPwl, whiteouts)

	manifest.PathWhitelist = newPwl
	if err := WriteManifest(trw, manifest); err != nil {
		return nil, fmt.Errorf("error writing manifest: %v", err)
	}

	return &manifest, nil
}

func runPatchManifest(args []string) (exit int) {
	var fh *os.File
	var err error

	if patchReplace && patchOverwrite {
		stderr("patch-manifest: Cannot use both --replace and --overwrite")
		return 1
	}
	if !patchReplace && len(args) != 2 {
		stderr("patch-manifest: Must provide input and output files (or use --replace)")
		return 1
	}
	if patchReplace && len(args) != 1 {
		stderr("patch-manifest: Must provide one file")
		return 1
	}
	if patchManifestFile != "" && (patchName != "" || patchExec != "" || patchUser != "" || patchGroup != "" || patchCaps != "" || patchMounts != "") {
		stderr("patch-manifest: --manifest is incompatible with other manifest editing options")
		return 1
	}

	inputFile = args[0]

	// Prepare output writer

	if patchReplace {
		fh, err = ioutil.TempFile(path.Dir(inputFile), ".actool-tmp."+path.Base(inputFile)+"-")
		if err != nil {
			stderr("patch-manifest: Cannot create temporary file: %v", err)
			return 1
		}
	} else {
		outputFile = args[1]

		ext := filepath.Ext(outputFile)
		if ext != schema.ACIExtension {
			stderr("patch-manifest: Extension must be %s (given %s)", schema.ACIExtension, ext)
			return 1
		}

		mode := os.O_CREATE | os.O_WRONLY
		if patchOverwrite {
			mode |= os.O_TRUNC
		} else {
			mode |= os.O_EXCL
		}

		fh, err = os.OpenFile(outputFile, mode, 0644)
		if err != nil {
			if os.IsExist(err) {
				stderr("patch-manifest: Output file exists (try --overwrite)")
			} else {
				stderr("patch-manifest: Unable to open output %s: %v", outputFile, err)
			}
			return 1
		}
	}

	var gw *gzip.Writer
	var w io.WriteCloser = fh
	if !patchNocompress {
		gw = gzip.NewWriter(fh)
		w = gw
	}
	tw := tar.NewWriter(w)

	defer func() {
		tw.Close()
		if !patchNocompress {
			gw.Close()
		}
		fh.Close()
		if exit != 0 && !patchOverwrite {
			os.Remove(fh.Name())
		}
	}()

	// Prepare input reader

	input, err := os.Open(inputFile)
	if err != nil {
		stderr("patch-manifest: Cannot open %s: %v", inputFile, err)
		return 1
	}
	defer input.Close()

	tr, err := aci.NewCompressedTarReader(input)
	if err != nil {
		stderr("patch-manifest: Cannot extract %s: %v", inputFile, err)
		return 1
	}
	defer tr.Close()

	var newManifest []byte

	if patchManifestFile != "" {
		mr, err := os.Open(patchManifestFile)
		if err != nil {
			stderr("patch-manifest: Cannot open %s: %v", patchManifestFile, err)
			return 1
//.........這裏部分代碼省略.........

func writeACI(layer io.ReadSeeker, manifest schema.ImageManifest, curPwl []string, output string, compression common.Compression) (*schema.ImageManifest, error) {
	aciFile, err := os.Create(output)
	if err != nil {
		return nil, fmt.Errorf("error creating ACI file: %v", err)
	}
	defer aciFile.Close()

	var w io.WriteCloser = aciFile
	if compression == common.GzipCompression {
		w = gzip.NewWriter(aciFile)
		defer w.Close()
	}
	trw := tar.NewWriter(w)
	defer trw.Close()

	if err := WriteRootfsDir(trw); err != nil {
		return nil, fmt.Errorf("error writing rootfs entry: %v", err)
	}

	fileMap := make(map[string]struct{})
	var whiteouts []string
	convWalker := func(t *tarball.TarFile) error {
		name := t.Name()
		if name == "./" {
			return nil
		}
		t.Header.Name = path.Join("rootfs", name)
		absolutePath := strings.TrimPrefix(t.Header.Name, "rootfs")

		if filepath.Clean(absolutePath) == "/dev" && t.Header.Typeflag != tar.TypeDir {
			return fmt.Errorf(`invalid layer: "/dev" is not a directory`)
		}

		fileMap[absolutePath] = struct{}{}
		if strings.Contains(t.Header.Name, "/.wh.") {
			whiteouts = append(whiteouts, strings.Replace(absolutePath, ".wh.", "", 1))
			return nil
		}
		if t.Header.Typeflag == tar.TypeLink {
			t.Header.Linkname = path.Join("rootfs", t.Linkname())
		}

		if err := trw.WriteHeader(t.Header); err != nil {
			return err
		}
		if _, err := io.Copy(trw, t.TarStream); err != nil {
			return err
		}

		if !util.In(curPwl, absolutePath) {
			curPwl = append(curPwl, absolutePath)
		}

		return nil
	}
	tr, err := aci.NewCompressedTarReader(layer)
	if err == nil {
		defer tr.Close()
		// write files in rootfs/
		if err := tarball.Walk(*tr.Reader, convWalker); err != nil {
			return nil, err
		}
	} else {
		// ignore errors: empty layers in tars generated by docker save are not
		// valid tar files so we ignore errors trying to open them. Converted
		// ACIs will have the manifest and an empty rootfs directory in any
		// case.
	}
	newPwl := subtractWhiteouts(curPwl, whiteouts)

	newPwl, err = writeStdioSymlinks(trw, fileMap, newPwl)
	if err != nil {
		return nil, err
	}
	// Let's copy the newly generated PathWhitelist to avoid unintended
	// side-effects
	manifest.PathWhitelist = make([]string, len(newPwl))
	copy(manifest.PathWhitelist, newPwl)

	if err := WriteManifest(trw, manifest); err != nil {
		return nil, fmt.Errorf("error writing manifest: %v", err)
	}

	return &manifest, nil
}