mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
299 lines
8.6 KiB
Go
299 lines
8.6 KiB
Go
package graph
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import (
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"fmt"
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"io"
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"net"
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"net/url"
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"strings"
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"time"
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"github.com/docker/docker/engine"
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"github.com/docker/docker/image"
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"github.com/docker/docker/pkg/log"
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"github.com/docker/docker/registry"
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"github.com/docker/docker/utils"
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)
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func (s *TagStore) CmdPull(job *engine.Job) engine.Status {
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if n := len(job.Args); n != 1 && n != 2 {
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return job.Errorf("Usage: %s IMAGE [TAG]", job.Name)
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}
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var (
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localName = job.Args[0]
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tag string
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sf = utils.NewStreamFormatter(job.GetenvBool("json"))
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authConfig = ®istry.AuthConfig{}
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metaHeaders map[string][]string
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)
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if len(job.Args) > 1 {
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tag = job.Args[1]
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}
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job.GetenvJson("authConfig", authConfig)
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job.GetenvJson("metaHeaders", &metaHeaders)
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c, err := s.poolAdd("pull", localName+":"+tag)
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if err != nil {
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if c != nil {
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// Another pull of the same repository is already taking place; just wait for it to finish
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job.Stdout.Write(sf.FormatStatus("", "Repository %s already being pulled by another client. Waiting.", localName))
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<-c
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return engine.StatusOK
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}
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return job.Error(err)
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}
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defer s.poolRemove("pull", localName+":"+tag)
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// Resolve the Repository name from fqn to endpoint + name
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hostname, remoteName, err := registry.ResolveRepositoryName(localName)
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if err != nil {
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return job.Error(err)
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}
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endpoint, err := registry.ExpandAndVerifyRegistryUrl(hostname)
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if err != nil {
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return job.Error(err)
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}
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r, err := registry.NewSession(authConfig, registry.HTTPRequestFactory(metaHeaders), endpoint, true)
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if err != nil {
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return job.Error(err)
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}
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if endpoint == registry.IndexServerAddress() {
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// If pull "index.docker.io/foo/bar", it's stored locally under "foo/bar"
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localName = remoteName
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}
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if err = s.pullRepository(r, job.Stdout, localName, remoteName, tag, sf, job.GetenvBool("parallel")); err != nil {
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return job.Error(err)
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}
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return engine.StatusOK
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}
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func (s *TagStore) pullRepository(r *registry.Session, out io.Writer, localName, remoteName, askedTag string, sf *utils.StreamFormatter, parallel bool) error {
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out.Write(sf.FormatStatus("", "Pulling repository %s", localName))
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repoData, err := r.GetRepositoryData(remoteName)
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if err != nil {
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if strings.Contains(err.Error(), "HTTP code: 404") {
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return fmt.Errorf("Error: image %s not found", remoteName)
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}
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// Unexpected HTTP error
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return err
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}
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log.Debugf("Retrieving the tag list")
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tagsList, err := r.GetRemoteTags(repoData.Endpoints, remoteName, repoData.Tokens)
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if err != nil {
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log.Errorf("%v", err)
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return err
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}
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for tag, id := range tagsList {
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repoData.ImgList[id] = ®istry.ImgData{
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ID: id,
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Tag: tag,
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Checksum: "",
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}
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}
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log.Debugf("Registering tags")
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// If no tag has been specified, pull them all
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if askedTag == "" {
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for tag, id := range tagsList {
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repoData.ImgList[id].Tag = tag
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}
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} else {
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// Otherwise, check that the tag exists and use only that one
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id, exists := tagsList[askedTag]
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if !exists {
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return fmt.Errorf("Tag %s not found in repository %s", askedTag, localName)
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}
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repoData.ImgList[id].Tag = askedTag
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}
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errors := make(chan error)
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for _, image := range repoData.ImgList {
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downloadImage := func(img *registry.ImgData) {
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if askedTag != "" && img.Tag != askedTag {
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log.Debugf("(%s) does not match %s (id: %s), skipping", img.Tag, askedTag, img.ID)
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if parallel {
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errors <- nil
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}
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return
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}
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if img.Tag == "" {
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log.Debugf("Image (id: %s) present in this repository but untagged, skipping", img.ID)
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if parallel {
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errors <- nil
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}
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return
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}
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// ensure no two downloads of the same image happen at the same time
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if c, err := s.poolAdd("pull", "img:"+img.ID); err != nil {
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if c != nil {
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out.Write(sf.FormatProgress(utils.TruncateID(img.ID), "Layer already being pulled by another client. Waiting.", nil))
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<-c
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out.Write(sf.FormatProgress(utils.TruncateID(img.ID), "Download complete", nil))
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} else {
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log.Debugf("Image (id: %s) pull is already running, skipping: %v", img.ID, err)
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}
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if parallel {
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errors <- nil
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}
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return
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}
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defer s.poolRemove("pull", "img:"+img.ID)
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out.Write(sf.FormatProgress(utils.TruncateID(img.ID), fmt.Sprintf("Pulling image (%s) from %s", img.Tag, localName), nil))
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success := false
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var lastErr error
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for _, ep := range repoData.Endpoints {
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out.Write(sf.FormatProgress(utils.TruncateID(img.ID), fmt.Sprintf("Pulling image (%s) from %s, endpoint: %s", img.Tag, localName, ep), nil))
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if err := s.pullImage(r, out, img.ID, ep, repoData.Tokens, sf); err != nil {
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// It's not ideal that only the last error is returned, it would be better to concatenate the errors.
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// As the error is also given to the output stream the user will see the error.
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lastErr = err
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out.Write(sf.FormatProgress(utils.TruncateID(img.ID), fmt.Sprintf("Error pulling image (%s) from %s, endpoint: %s, %s", img.Tag, localName, ep, err), nil))
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continue
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}
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success = true
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break
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}
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if !success {
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err := fmt.Errorf("Error pulling image (%s) from %s, %v", img.Tag, localName, lastErr)
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out.Write(sf.FormatProgress(utils.TruncateID(img.ID), err.Error(), nil))
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if parallel {
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errors <- err
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return
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}
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}
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out.Write(sf.FormatProgress(utils.TruncateID(img.ID), "Download complete", nil))
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if parallel {
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errors <- nil
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}
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}
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if parallel {
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go downloadImage(image)
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} else {
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downloadImage(image)
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}
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}
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if parallel {
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var lastError error
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for i := 0; i < len(repoData.ImgList); i++ {
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if err := <-errors; err != nil {
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lastError = err
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}
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}
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if lastError != nil {
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return lastError
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}
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}
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for tag, id := range tagsList {
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if askedTag != "" && tag != askedTag {
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continue
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}
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if err := s.Set(localName, tag, id, true); err != nil {
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return err
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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) pullImage(r *registry.Session, out io.Writer, imgID, endpoint string, token []string, sf *utils.StreamFormatter) error {
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history, err := r.GetRemoteHistory(imgID, endpoint, token)
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if err != nil {
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return err
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}
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out.Write(sf.FormatProgress(utils.TruncateID(imgID), "Pulling dependent layers", nil))
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// FIXME: Try to stream the images?
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// FIXME: Launch the getRemoteImage() in goroutines
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for i := len(history) - 1; i >= 0; i-- {
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id := history[i]
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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:"+id); err != nil {
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log.Debugf("Image (id: %s) pull is already running, skipping: %v", id, err)
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<-c
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}
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defer s.poolRemove("pull", "layer:"+id)
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if !s.graph.Exists(id) {
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out.Write(sf.FormatProgress(utils.TruncateID(id), "Pulling metadata", nil))
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var (
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imgJSON []byte
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imgSize int
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err error
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img *image.Image
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)
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retries := 5
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for j := 1; j <= retries; j++ {
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imgJSON, imgSize, err = r.GetRemoteImageJSON(id, endpoint, token)
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if err != nil && j == retries {
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out.Write(sf.FormatProgress(utils.TruncateID(id), "Error pulling dependent layers", nil))
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return err
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} else if err != nil {
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time.Sleep(time.Duration(j) * 500 * time.Millisecond)
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continue
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}
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img, err = image.NewImgJSON(imgJSON)
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if err != nil && j == retries {
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out.Write(sf.FormatProgress(utils.TruncateID(id), "Error pulling dependent layers", nil))
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return fmt.Errorf("Failed to parse json: %s", err)
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} else if err != nil {
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time.Sleep(time.Duration(j) * 500 * time.Millisecond)
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continue
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} else {
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break
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}
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}
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for j := 1; j <= retries; j++ {
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// Get the layer
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status := "Pulling fs layer"
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if j > 1 {
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status = fmt.Sprintf("Pulling fs layer [retries: %d]", j)
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}
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out.Write(sf.FormatProgress(utils.TruncateID(id), status, nil))
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layer, err := r.GetRemoteImageLayer(img.ID, endpoint, token, int64(imgSize))
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if uerr, ok := err.(*url.Error); ok {
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err = uerr.Err
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}
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if terr, ok := err.(net.Error); ok && terr.Timeout() && j < retries {
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time.Sleep(time.Duration(j) * 500 * time.Millisecond)
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continue
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} else if err != nil {
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out.Write(sf.FormatProgress(utils.TruncateID(id), "Error pulling dependent layers", nil))
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return err
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}
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defer layer.Close()
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err = s.graph.Register(img, imgJSON,
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utils.ProgressReader(layer, imgSize, out, sf, false, utils.TruncateID(id), "Downloading"))
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if terr, ok := err.(net.Error); ok && terr.Timeout() && j < retries {
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time.Sleep(time.Duration(j) * 500 * time.Millisecond)
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continue
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} else if err != nil {
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out.Write(sf.FormatProgress(utils.TruncateID(id), "Error downloading dependent layers", nil))
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return err
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} else {
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break
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}
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}
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}
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out.Write(sf.FormatProgress(utils.TruncateID(id), "Download complete", nil))
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}
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return nil
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}
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