func (container *Container) Export() (archive.Archive, error) { if err := container.Mount(); err != nil { return nil, err } archive, err := archive.Tar(container.basefs, archive.Uncompressed) if err != nil { return nil, err } return EofReader(archive, func() { container.Unmount() }), 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 EofReader(archive, func() { driver.Put(img.ID) }), 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 EofReader(archive, func() { driver.Put(img.ID) }), nil }
func (b *buildFile) CmdAdd(args string) error { if b.context == nil { return fmt.Errorf("No context given. Impossible to use ADD") } tmp := strings.SplitN(args, " ", 2) if len(tmp) != 2 { return fmt.Errorf("Invalid ADD format") } orig, err := b.ReplaceEnvMatches(strings.Trim(tmp[0], " \t")) if err != nil { return err } dest, err := b.ReplaceEnvMatches(strings.Trim(tmp[1], " \t")) if err != nil { return err } cmd := b.config.Cmd b.config.Cmd = []string{"/bin/sh", "-c", fmt.Sprintf("#(nop) ADD %s in %s", orig, dest)} b.config.Image = b.image // FIXME: do we really need this? var ( origPath = orig destPath = dest remoteHash string ) if utils.IsURL(orig) { resp, err := utils.Download(orig) if err != nil { return err } tmpDirName, err := ioutil.TempDir(b.contextPath, "docker-remote") if err != nil { return err } tmpFileName := path.Join(tmpDirName, "tmp") tmpFile, err := os.OpenFile(tmpFileName, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0600) if err != nil { return err } defer os.RemoveAll(tmpDirName) if _, err = io.Copy(tmpFile, resp.Body); err != nil { tmpFile.Close() return err } origPath = path.Join(filepath.Base(tmpDirName), filepath.Base(tmpFileName)) tmpFile.Close() // Process the checksum r, err := archive.Tar(tmpFileName, archive.Uncompressed) if err != nil { return err } tarSum := utils.TarSum{Reader: r, DisableCompression: true} remoteHash = tarSum.Sum(nil) // If the destination is a directory, figure out the filename. if strings.HasSuffix(dest, "/") { u, err := url.Parse(orig) if err != nil { return err } path := u.Path if strings.HasSuffix(path, "/") { path = path[:len(path)-1] } parts := strings.Split(path, "/") filename := parts[len(parts)-1] if filename == "" { return fmt.Errorf("cannot determine filename from url: %s", u) } destPath = dest + filename } } if err := b.checkPathForAddition(origPath); err != nil { return err } // Hash path and check the cache if b.utilizeCache { var ( hash string sums = b.context.GetSums() ) if remoteHash != "" { hash = remoteHash } else if fi, err := os.Stat(path.Join(b.contextPath, origPath)); err != nil { return err } else if fi.IsDir() { var subfiles []string for file, sum := range sums { absFile := path.Join(b.contextPath, file) absOrigPath := path.Join(b.contextPath, origPath) if strings.HasPrefix(absFile, absOrigPath) { subfiles = append(subfiles, sum) } } sort.Strings(subfiles) hasher := sha256.New() hasher.Write([]byte(strings.Join(subfiles, ","))) hash = "dir:" + hex.EncodeToString(hasher.Sum(nil)) } else { if origPath[0] == '/' && len(origPath) > 1 { origPath = origPath[1:] } origPath = strings.TrimPrefix(origPath, "./") if h, ok := sums[origPath]; ok { hash = "file:" + h } } b.config.Cmd = []string{"/bin/sh", "-c", fmt.Sprintf("#(nop) ADD %s in %s", hash, dest)} hit, err := b.probeCache() if err != nil { return err } // If we do not have a hash, never use the cache if hit && hash != "" { return nil } } // Create the container and start it container, _, err := b.runtime.Create(b.config, "") if err != nil { return err } b.tmpContainers[container.ID] = struct{}{} if err := container.Mount(); err != nil { return err } defer container.Unmount() if err := b.addContext(container, origPath, destPath); err != nil { return err } if err := b.commit(container.ID, cmd, fmt.Sprintf("ADD %s in %s", orig, dest)); err != nil { return err } b.config.Cmd = cmd return nil }