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moby--moby/graph/load.go

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