Golang archive.ChangesDirs函數代碼示例

// TarLayer returns a tar archive of the image's filesystem layer.
func (img *Image) TarLayer() (archive.Archive, 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
	}
	if img.Parent == "" {
		return archive.Tar(imgFs, archive.Uncompressed)
	} else {
		parentFs, err := driver.Get(img.Parent)
		if err != nil {
			return nil, err
		}
		changes, err := archive.ChangesDirs(imgFs, parentFs)
		if err != nil {
			return nil, err
		}
		return archive.ExportChanges(imgFs, changes)
	}
}

// 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 utils.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 utils.NewReadCloserWrapper(archive, func() error {
		err := archive.Close()
		driver.Put(img.ID)
		return err
	}), nil
}

func (runtime *Runtime) Changes(container *Container) ([]archive.Change, error) {
	if differ, ok := runtime.driver.(graphdriver.Differ); ok {
		return differ.Changes(container.ID)
	}
	cDir, err := runtime.driver.Get(container.ID)
	if err != nil {
		return nil, fmt.Errorf("Error getting container rootfs %s from driver %s: %s", container.ID, container.runtime.driver, err)
	}
	initDir, err := runtime.driver.Get(container.ID + "-init")
	if err != nil {
		return nil, fmt.Errorf("Error getting container init rootfs %s from driver %s: %s", container.ID, container.runtime.driver, err)
	}
	return archive.ChangesDirs(cDir, initDir)
}

func (daemon *Daemon) Changes(container *Container) ([]archive.Change, error) {
	if differ, ok := daemon.driver.(graphdriver.Differ); ok {
		return differ.Changes(container.ID)
	}
	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)
	}
	defer daemon.driver.Put(container.ID)
	initDir, err := daemon.driver.Get(container.ID+"-init", "")
	if err != nil {
		return nil, fmt.Errorf("Error getting container init rootfs %s from driver %s: %s", container.ID, container.daemon.driver, err)
	}
	defer daemon.driver.Put(container.ID + "-init")
	return archive.ChangesDirs(cDir, initDir)
}

// Get returns the image with the given id, or an error if the image doesn't exist.
func (graph *Graph) Get(name string) (*image.Image, error) {
	id, err := graph.idIndex.Get(name)
	if err != nil {
		return nil, err
	}
	// FIXME: return nil when the image doesn't exist, instead of an error
	img, err := image.LoadImage(graph.ImageRoot(id))
	if err != nil {
		return nil, err
	}
	if img.ID != id {
		return nil, fmt.Errorf("Image stored at '%s' has wrong id '%s'", id, img.ID)
	}
	img.SetGraph(graph)

	if img.Size < 0 {
		rootfs, err := graph.driver.Get(img.ID, "")
		if err != nil {
			return nil, fmt.Errorf("Driver %s failed to get image rootfs %s: %s", graph.driver, img.ID, err)
		}
		defer graph.driver.Put(img.ID)

		var size int64
		if img.Parent == "" {
			if size, err = utils.TreeSize(rootfs); err != nil {
				return nil, err
			}
		} else {
			parentFs, err := graph.driver.Get(img.Parent, "")
			if err != nil {
				return nil, err
			}
			changes, err := archive.ChangesDirs(rootfs, parentFs)
			if err != nil {
				return nil, err
			}
			size = archive.ChangesSize(rootfs, changes)
		}

		img.Size = size
		if err := img.SaveSize(graph.ImageRoot(id)); err != nil {
			return nil, err
		}
	}
	return img, nil
}

func StoreImage(img *Image, jsonData []byte, layerData archive.Archive, root, layer string) error {
	// Store the layer
	var (
		size   int64
		err    error
		driver = img.graph.driver
	)
	if err := os.MkdirAll(layer, 0755); err != nil {
		return err
	}

	// If layerData is not nil, unpack it into the new layer
	if layerData != nil {
		if differ, ok := driver.(graphdriver.Differ); ok {
			if err := differ.ApplyDiff(img.ID, layerData); err != nil {
				return err
			}

			if size, err = differ.DiffSize(img.ID); err != nil {
				return err
			}
		} else {
			start := time.Now().UTC()
			utils.Debugf("Start untar layer")
			if err := archive.ApplyLayer(layer, layerData); err != nil {
				return err
			}
			utils.Debugf("Untar time: %vs", time.Now().UTC().Sub(start).Seconds())

			if img.Parent == "" {
				if size, err = utils.TreeSize(layer); err != nil {
					return err
				}
			} else {
				parent, err := driver.Get(img.Parent)
				if err != nil {
					return err
				}
				defer driver.Put(img.Parent)
				changes, err := archive.ChangesDirs(layer, parent)
				if err != nil {
					return err
				}
				size = archive.ChangesSize(layer, changes)
			}
		}
	}

	img.Size = size
	if err := img.SaveSize(root); err != nil {
		return err
	}

	// If raw json is provided, then use it
	if jsonData != nil {
		if err := ioutil.WriteFile(jsonPath(root), jsonData, 0600); err != nil {
			return err
		}
	} else {
		if jsonData, err = json.Marshal(img); err != nil {
			return err
		}
		if err := ioutil.WriteFile(jsonPath(root), jsonData, 0600); err != nil {
			return err
		}
	}
	return nil
}