135 lines
3.1 KiB
Go
135 lines
3.1 KiB
Go
// +build linux windows
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package graph
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import (
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"encoding/json"
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"io"
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"io/ioutil"
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"os"
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"path/filepath"
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"github.com/Sirupsen/logrus"
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"github.com/docker/docker/image"
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"github.com/docker/docker/pkg/archive"
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"github.com/docker/docker/pkg/chrootarchive"
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)
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// Loads a set of images into the repository. This is the complementary of ImageExport.
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// The input stream is an uncompressed tar ball containing images and metadata.
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func (s *TagStore) Load(inTar io.ReadCloser, outStream io.Writer) error {
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tmpImageDir, err := ioutil.TempDir("", "docker-import-")
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if err != nil {
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return err
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}
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defer os.RemoveAll(tmpImageDir)
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var (
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repoDir = filepath.Join(tmpImageDir, "repo")
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)
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if err := os.Mkdir(repoDir, os.ModeDir); err != nil {
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return err
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}
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images := s.graph.Map()
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excludes := make([]string, len(images))
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i := 0
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for k := range images {
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excludes[i] = k
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i++
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}
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if err := chrootarchive.Untar(inTar, repoDir, &archive.TarOptions{ExcludePatterns: excludes}); err != nil {
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return err
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}
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dirs, err := ioutil.ReadDir(repoDir)
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if err != nil {
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return err
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}
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for _, d := range dirs {
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if d.IsDir() {
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if err := s.recursiveLoad(d.Name(), tmpImageDir); err != nil {
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return err
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}
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}
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}
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reposJSONFile, err := os.Open(filepath.Join(tmpImageDir, "repo", "repositories"))
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if err != nil {
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if !os.IsNotExist(err) {
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return err
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}
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return nil
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}
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defer reposJSONFile.Close()
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repositories := map[string]Repository{}
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if err := json.NewDecoder(reposJSONFile).Decode(&repositories); err != nil {
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return err
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}
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for imageName, tagMap := range repositories {
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for tag, address := range tagMap {
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if err := s.SetLoad(imageName, tag, address, true, outStream); err != nil {
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return err
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}
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}
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}
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return nil
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}
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func (s *TagStore) recursiveLoad(address, tmpImageDir string) error {
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if _, err := s.LookupImage(address); err != nil {
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logrus.Debugf("Loading %s", address)
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imageJson, err := ioutil.ReadFile(filepath.Join(tmpImageDir, "repo", address, "json"))
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if err != nil {
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logrus.Debugf("Error reading json: %v", err)
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return err
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}
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layer, err := os.Open(filepath.Join(tmpImageDir, "repo", address, "layer.tar"))
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if err != nil {
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logrus.Debugf("Error reading embedded tar: %v", err)
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return err
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}
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img, err := image.NewImgJSON(imageJson)
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if err != nil {
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logrus.Debugf("Error unmarshalling json: %v", err)
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return err
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}
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if err := image.ValidateID(img.ID); err != nil {
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logrus.Debugf("Error validating ID: %v", err)
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return err
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}
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// ensure no two downloads of the same layer happen at the same time
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if c, err := s.poolAdd("pull", "layer:"+img.ID); err != nil {
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if c != nil {
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logrus.Debugf("Image (id: %s) load is already running, waiting: %v", img.ID, err)
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<-c
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return nil
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}
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return err
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}
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defer s.poolRemove("pull", "layer:"+img.ID)
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if img.Parent != "" {
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if !s.graph.Exists(img.Parent) {
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if err := s.recursiveLoad(img.Parent, tmpImageDir); err != nil {
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return err
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}
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}
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}
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if err := s.graph.Register(img, layer); err != nil {
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return err
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}
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}
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logrus.Debugf("Completed processing %s", address)
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return nil
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}
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