Golang ioutils.NewReadCloserWrapper函数代码示例

func diff(id, parent string) (diff archive.Archive, err error) {

	// create pod

	// start or replace pod
	glog.Infof("Diff between %s and %s", id, parent)
	layerFs := "/tmp/test1"
	if parent == "" {
		archive, err := archive.Tar(layerFs, archive.Uncompressed)
		if err != nil {
			return nil, err
		}
		return ioutils.NewReadCloserWrapper(archive, func() error {
			err := archive.Close()
			return err
		}), nil
	}

	parentFs := "/tmp/test2"

	changes, err := archive.ChangesDirs(layerFs, parentFs)
	if err != nil {
		return nil, err
	}

	archive, err := archive.ExportChanges(layerFs, changes)
	if err != nil {
		return nil, err
	}

	return ioutils.NewReadCloserWrapper(archive, func() error {
		err := archive.Close()
		return err
	}), nil
}

func (c *devicemapper) TarStream(id, parent string) (io.ReadCloser, error) {
	mainPath, releaseMain, err := c.Mount(id)
	if err != nil {
		return nil, err
	}

	if parent == "" {
		tar, err := archive.Tar(mainPath, archive.Uncompressed)
		if err != nil {
			return nil, err
		}
		return ioutils.NewReadCloserWrapper(tar, func() error {
			releaseMain()
			return tar.Close()
		}), nil
	}

	parentPath, releaseParent, err := c.Mount(parent)
	if err != nil {
		releaseMain()
		return nil, err
	}
	tar, err := Diff(mainPath, parentPath)
	if err != nil {
		releaseParent()
		releaseMain()
		return nil, err
	}
	return ioutils.NewReadCloserWrapper(tar, func() error {
		releaseParent()
		releaseMain()
		return tar.Close()
	}), nil
}

// Diff produces an archive of the changes between the specified
// layer and its parent layer which may be "".
func (gdw *NaiveDiffDriver) Diff(id, parent string) (arch archive.Archive, err error) {
	startTime := time.Now()
	driver := gdw.ProtoDriver

	layerFs, err := driver.Get(id, "")
	if err != nil {
		return nil, err
	}

	defer func() {
		if err != nil {
			driver.Put(id)
		}
	}()

	if parent == "" {
		archive, err := archive.Tar(layerFs, archive.Uncompressed)
		if err != nil {
			return nil, err
		}
		return ioutils.NewReadCloserWrapper(archive, func() error {
			err := archive.Close()
			driver.Put(id)
			return err
		}), nil
	}

	parentFs, err := driver.Get(parent, "")
	if err != nil {
		return nil, err
	}
	defer driver.Put(parent)

	changes, err := archive.ChangesDirs(layerFs, parentFs)
	if err != nil {
		return nil, err
	}

	archive, err := archive.ExportChanges(layerFs, changes, gdw.uidMaps, gdw.gidMaps)
	if err != nil {
		return nil, err
	}

	return ioutils.NewReadCloserWrapper(archive, func() error {
		err := archive.Close()
		driver.Put(id)

		// NaiveDiffDriver compares file metadata with parent layers. Parent layers
		// are extracted from tar's with full second precision on modified time.
		// We need this hack here to make sure calls within same second receive
		// correct result.
		time.Sleep(startTime.Truncate(time.Second).Add(time.Second).Sub(time.Now()))
		return err
	}), nil
}

// TarLayer returns a tar archive of the image's filesystem layer.
func (img *Image) TarLayer() (arch archive.Archive, err error) {
	if img.graph == nil {
		return nil, fmt.Errorf("Can't load storage driver for unregistered image %s", img.ID)
	}
	driver := img.graph.Driver()
	if differ, ok := driver.(graphdriver.Differ); ok {
		return differ.Diff(img.ID)
	}

	imgFs, err := driver.Get(img.ID, "")
	if err != nil {
		return nil, err
	}

	defer func() {
		if err != nil {
			driver.Put(img.ID)
		}
	}()

	if img.Parent == "" {
		archive, err := archive.Tar(imgFs, archive.Uncompressed)
		if err != nil {
			return nil, err
		}
		return ioutils.NewReadCloserWrapper(archive, func() error {
			err := archive.Close()
			driver.Put(img.ID)
			return err
		}), nil
	}

	parentFs, err := driver.Get(img.Parent, "")
	if err != nil {
		return nil, err
	}
	defer driver.Put(img.Parent)
	changes, err := archive.ChangesDirs(imgFs, parentFs)
	if err != nil {
		return nil, err
	}
	archive, err := archive.ExportChanges(imgFs, changes)
	if err != nil {
		return nil, err
	}
	return ioutils.NewReadCloserWrapper(archive, func() error {
		err := archive.Close()
		driver.Put(img.ID)
		return err
	}), nil
}

// Diff produces an archive of the changes between the specified
// layer and its parent layer which may be "".
func (gdw *naiveDiffDriver) Diff(id, parent string) (arch archive.Archive, err error) {
	driver := gdw.ProtoDriver

	layerFs, err := driver.Get(id, "")
	if err != nil {
		return nil, err
	}

	defer func() {
		if err != nil {
			driver.Put(id)
		}
	}()

	if parent == "" {
		archive, err := archive.Tar(layerFs, archive.Uncompressed)
		if err != nil {
			return nil, err
		}
		return ioutils.NewReadCloserWrapper(archive, func() error {
			err := archive.Close()
			driver.Put(id)
			return err
		}), nil
	}

	parentFs, err := driver.Get(parent, "")
	if err != nil {
		return nil, err
	}
	defer driver.Put(parent)

	changes, err := archive.ChangesDirs(layerFs, parentFs)
	if err != nil {
		return nil, err
	}

	archive, err := archive.ExportChanges(layerFs, changes)
	if err != nil {
		return nil, err
	}

	return ioutils.NewReadCloserWrapper(archive, func() error {
		err := archive.Close()
		driver.Put(id)
		return err
	}), nil
}

func sockRequestRaw(method, endpoint string, data io.Reader, ct string) (*http.Response, io.ReadCloser, error) {
	c, err := sockConn(time.Duration(10 * time.Second))
	if err != nil {
		return nil, nil, fmt.Errorf("could not dial docker daemon: %v", err)
	}

	client := httputil.NewClientConn(c, nil)

	req, err := http.NewRequest(method, endpoint, data)
	if err != nil {
		client.Close()
		return nil, nil, fmt.Errorf("could not create new request: %v", err)
	}

	if ct != "" {
		req.Header.Set("Content-Type", ct)
	}

	resp, err := client.Do(req)
	if err != nil {
		client.Close()
		return nil, nil, fmt.Errorf("could not perform request: %v", err)
	}
	body := ioutils.NewReadCloserWrapper(resp.Body, func() error {
		defer resp.Body.Close()
		return client.Close()
	})

	return resp, body, nil
}

func (container *Container) Copy(resource string) (io.ReadCloser, error) {
	container.Lock()
	defer container.Unlock()
	var err error
	if err := container.Mount(); err != nil {
		return nil, err
	}
	defer func() {
		if err != nil {
			// unmount any volumes
			container.UnmountVolumes(true)
			// unmount the container's rootfs
			container.Unmount()
		}
	}()
	mounts, err := container.setupMounts()
	if err != nil {
		return nil, err
	}
	for _, m := range mounts {
		dest, err := container.GetResourcePath(m.Destination)
		if err != nil {
			return nil, err
		}
		if err := mount.Mount(m.Source, dest, "bind", "rbind,ro"); err != nil {
			return nil, err
		}
	}
	basePath, err := container.GetResourcePath(resource)
	if err != nil {
		return nil, err
	}
	stat, err := os.Stat(basePath)
	if err != nil {
		return nil, err
	}
	var filter []string
	if !stat.IsDir() {
		d, f := filepath.Split(basePath)
		basePath = d
		filter = []string{f}
	} else {
		filter = []string{filepath.Base(basePath)}
		basePath = filepath.Dir(basePath)
	}
	archive, err := archive.TarWithOptions(basePath, &archive.TarOptions{
		Compression:  archive.Uncompressed,
		IncludeFiles: filter,
	})
	if err != nil {
		return nil, err
	}
	return ioutils.NewReadCloserWrapper(archive, func() error {
			err := archive.Close()
			container.UnmountVolumes(true)
			container.Unmount()
			return err
		}),
		nil
}

func makeTestLayer(paths []string) (rc io.ReadCloser, err error) {
	tmpDir, err := ioutil.TempDir("", "graphdriver-test-mklayer")
	if err != nil {
		return
	}
	defer func() {
		if err != nil {
			os.RemoveAll(tmpDir)
		}
	}()
	for _, p := range paths {
		if p[len(p)-1] == filepath.Separator {
			if err = os.MkdirAll(filepath.Join(tmpDir, p), 0700); err != nil {
				return
			}
		} else {
			if err = ioutil.WriteFile(filepath.Join(tmpDir, p), nil, 0600); err != nil {
				return
			}
		}
	}
	archive, err := Tar(tmpDir, Uncompressed)
	if err != nil {
		return
	}
	return ioutils.NewReadCloserWrapper(archive, func() error {
		err := archive.Close()
		os.RemoveAll(tmpDir)
		return err
	}), nil
}

// Diff produces an archive of the changes between the specified
// layer and its parent layer which may be "".
// The layer should be mounted when calling this function
func (d *Driver) Diff(id, parent string) (_ archive.Archive, err error) {
	rID, err := d.resolveID(id)
	if err != nil {
		return
	}

	layerChain, err := d.getLayerChain(rID)
	if err != nil {
		return
	}

	// this is assuming that the layer is unmounted
	if err := hcsshim.UnprepareLayer(d.info, rID); err != nil {
		return nil, err
	}
	prepare := func() {
		if err := hcsshim.PrepareLayer(d.info, rID, layerChain); err != nil {
			logrus.Warnf("Failed to Deactivate %s: %s", rID, err)
		}
	}

	arch, err := d.exportLayer(rID, layerChain)
	if err != nil {
		prepare()
		return
	}
	return ioutils.NewReadCloserWrapper(arch, func() error {
		err := arch.Close()
		prepare()
		return err
	}), nil
}

func (daemon *Daemon) Diff(container *Container) (archive.Archive, error) {
	if differ, ok := daemon.driver.(graphdriver.Differ); ok {
		return differ.Diff(container.ID)
	}

	changes, err := daemon.Changes(container)
	if err != nil {
		return nil, err
	}

	cDir, err := daemon.driver.Get(container.ID, "")
	if err != nil {
		return nil, fmt.Errorf("Error getting container rootfs %s from driver %s: %s", container.ID, container.daemon.driver, err)
	}

	archive, err := archive.ExportChanges(cDir, changes)
	if err != nil {
		return nil, err
	}
	return ioutils.NewReadCloserWrapper(archive, func() error {
		err := archive.Close()
		daemon.driver.Put(container.ID)
		return err
	}), nil
}

func (container *Container) ExportRw(options *archive.ChangeOptions) (archive.Archive, error) {
	if err := container.Mount(); err != nil {
		return nil, err
	}
	if container.daemon == nil {
		return nil, fmt.Errorf("Can't load storage driver for unregistered container %s", container.ID)
	}
	var (
		commitID = fmt.Sprintf("%s-commit", container.ID)
		driver   = container.daemon.driver
	)
	// create tmp rootfs for commit
	if err := container.daemon.createTmpRootfs(container); err != nil {
		return nil, err
	}
	defer driver.Remove(commitID)

	archive, err := driver.Diff(container.ID, commitID, options)
	if err != nil {
		container.Unmount()
		return nil, err
	}
	return ioutils.NewReadCloserWrapper(archive, func() error {
			err := archive.Close()
			container.Unmount()
			return err
		}),
		nil
}

// getContextFromReader will read the contents of the given reader as either a
// Dockerfile or tar archive. Returns a tar archive used as a context and a
// path to the Dockerfile inside the tar.
func getContextFromReader(r io.ReadCloser, dockerfileName string) (out io.ReadCloser, relDockerfile string, err error) {
	buf := bufio.NewReader(r)

	magic, err := buf.Peek(archive.HeaderSize)
	if err != nil && err != io.EOF {
		return nil, "", fmt.Errorf("failed to peek context header from STDIN: %v", err)
	}

	if archive.IsArchive(magic) {
		return ioutils.NewReadCloserWrapper(buf, func() error { return r.Close() }), dockerfileName, nil
	}

	// Input should be read as a Dockerfile.
	tmpDir, err := ioutil.TempDir("", "docker-build-context-")
	if err != nil {
		return nil, "", fmt.Errorf("unbale to create temporary context directory: %v", err)
	}

	f, err := os.Create(filepath.Join(tmpDir, api.DefaultDockerfileName))
	if err != nil {
		return nil, "", err
	}
	_, err = io.Copy(f, buf)
	if err != nil {
		f.Close()
		return nil, "", err
	}

	if err := f.Close(); err != nil {
		return nil, "", err
	}
	if err := r.Close(); err != nil {
		return nil, "", err
	}

	tar, err := archive.Tar(tmpDir, archive.Uncompressed)
	if err != nil {
		return nil, "", err
	}

	return ioutils.NewReadCloserWrapper(tar, func() error {
		err := tar.Close()
		os.RemoveAll(tmpDir)
		return err
	}), api.DefaultDockerfileName, nil

}

func (container *Container) Copy(resource string) (io.ReadCloser, error) {
	if err := container.Mount(); err != nil {
		return nil, err
	}

	basePath, err := container.getResourcePath(resource)
	if err != nil {
		container.Unmount()
		return nil, err
	}

	// Check if this is actually in a volume
	for _, mnt := range container.VolumeMounts() {
		if len(mnt.MountToPath) > 0 && strings.HasPrefix(resource, mnt.MountToPath[1:]) {
			return mnt.Export(resource)
		}
	}

	// Check if this is a special one (resolv.conf, hostname, ..)
	if resource == "etc/resolv.conf" {
		basePath = container.ResolvConfPath
	}
	if resource == "etc/hostname" {
		basePath = container.HostnamePath
	}
	if resource == "etc/hosts" {
		basePath = container.HostsPath
	}

	stat, err := os.Stat(basePath)
	if err != nil {
		container.Unmount()
		return nil, err
	}
	var filter []string
	if !stat.IsDir() {
		d, f := path.Split(basePath)
		basePath = d
		filter = []string{f}
	} else {
		filter = []string{path.Base(basePath)}
		basePath = path.Dir(basePath)
	}

	archive, err := archive.TarWithOptions(basePath, &archive.TarOptions{
		Compression:  archive.Uncompressed,
		IncludeFiles: filter,
	})
	if err != nil {
		container.Unmount()
		return nil, err
	}
	return ioutils.NewReadCloserWrapper(archive, func() error {
			err := archive.Close()
			container.Unmount()
			return err
		}),
		nil
}

func (bufPool *BufioReaderPool) NewReadCloserWrapper(buf *bufio.Reader, r io.Reader) io.ReadCloser {
	return ioutils.NewReadCloserWrapper(r, func() error {
		if readCloser, ok := r.(io.ReadCloser); ok {
			return readCloser.Close()
		}
		return nil
	})
}

func (s *containerRouter) postContainersAttach(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
	err := httputils.ParseForm(r)
	if err != nil {
		return err
	}
	containerName := vars["name"]

	_, upgrade := r.Header["Upgrade"]

	keys := []byte{}
	detachKeys := r.FormValue("detachKeys")
	if detachKeys != "" {
		keys, err = term.ToBytes(detachKeys)
		if err != nil {
			logrus.Warnf("Invalid escape keys provided (%s) using default : ctrl-p ctrl-q", detachKeys)
		}
	}

	hijacker, ok := w.(http.Hijacker)
	if !ok {
		return derr.ErrorCodeNoHijackConnection.WithArgs(containerName)
	}

	setupStreams := func() (io.ReadCloser, io.Writer, io.Writer, error) {
		conn, _, err := hijacker.Hijack()
		if err != nil {
			return nil, nil, nil, err
		}

		// set raw mode
		conn.Write([]byte{})

		if upgrade {
			fmt.Fprintf(conn, "HTTP/1.1 101 UPGRADED\r\nContent-Type: application/vnd.docker.raw-stream\r\nConnection: Upgrade\r\nUpgrade: tcp\r\n\r\n")
		} else {
			fmt.Fprintf(conn, "HTTP/1.1 200 OK\r\nContent-Type: application/vnd.docker.raw-stream\r\n\r\n")
		}

		closer := func() error {
			httputils.CloseStreams(conn)
			return nil
		}
		return ioutils.NewReadCloserWrapper(conn, closer), conn, conn, nil
	}

	attachConfig := &backend.ContainerAttachConfig{
		GetStreams: setupStreams,
		UseStdin:   httputils.BoolValue(r, "stdin"),
		UseStdout:  httputils.BoolValue(r, "stdout"),
		UseStderr:  httputils.BoolValue(r, "stderr"),
		Logs:       httputils.BoolValue(r, "logs"),
		Stream:     httputils.BoolValue(r, "stream"),
		DetachKeys: keys,
		MuxStreams: true,
	}

	return s.backend.ContainerAttach(containerName, attachConfig)
}