示例#1
0
// GetImageID returns an image ID corresponding to the image referred to by
// refOrID.
func (daemon *Daemon) GetImageID(refOrID string) (image.ID, error) {
	// Treat as an ID
	if id, err := digest.ParseDigest(refOrID); err == nil {
		return image.ID(id), nil
	}

	// Treat it as a possible tag or digest reference
	if ref, err := reference.ParseNamed(refOrID); err == nil {
		ref = registry.NormalizeLocalReference(ref)
		if id, err := daemon.tagStore.Get(ref); err == nil {
			return id, nil
		}
		if tagged, ok := ref.(reference.Tagged); ok {
			if id, err := daemon.imageStore.Search(tagged.Tag()); err == nil {
				for _, namedRef := range daemon.tagStore.References(id) {
					if namedRef.Name() == ref.Name() {
						return id, nil
					}
				}
			}
		}
	}

	// Search based on ID
	if id, err := daemon.imageStore.Search(refOrID); err == nil {
		return id, nil
	}

	return "", ErrImageDoesNotExist{refOrID}
}
示例#2
0
// TagImage creates a tag in the repository reponame, pointing to the image named
// imageName.
func (daemon *Daemon) TagImage(newTag reference.Named, imageName string) error {
	imageID, err := daemon.GetImageID(imageName)
	if err != nil {
		return err
	}
	newTag = registry.NormalizeLocalReference(newTag)
	if err := daemon.tagStore.AddTag(newTag, imageID, true); err != nil {
		return err
	}
	daemon.EventsService.Log("tag", newTag.String(), "")
	return nil
}
示例#3
0
// TagImage creates a tag in the repository reponame, pointing to the image named
// imageName. If force is true, an existing tag with the same name may be
// overwritten.
func (daemon *Daemon) TagImage(newTag reference.Named, imageName string, force bool) error {
	if _, isDigested := newTag.(reference.Digested); isDigested {
		return errors.New("refusing to create a tag with a digest reference")
	}
	if newTag.Name() == string(digest.Canonical) {
		return errors.New("refusing to create an ambiguous tag using digest algorithm as name")
	}

	newTag = registry.NormalizeLocalReference(newTag)
	imageID, err := daemon.GetImageID(imageName)
	if err != nil {
		return err
	}
	daemon.EventsService.Log("tag", newTag.String(), "")
	return daemon.tagStore.Add(newTag, imageID, force)
}
示例#4
0
文件: save.go 项目: RockaLabs/docker
func (l *tarexporter) parseNames(names []string) (map[image.ID]*imageDescriptor, error) {
	imgDescr := make(map[image.ID]*imageDescriptor)

	addAssoc := func(id image.ID, ref reference.Named) {
		if _, ok := imgDescr[id]; !ok {
			imgDescr[id] = &imageDescriptor{}
		}

		if ref != nil {
			var tagged reference.NamedTagged
			if _, ok := ref.(reference.Digested); ok {
				return
			}
			var ok bool
			if tagged, ok = ref.(reference.NamedTagged); !ok {
				var err error
				if tagged, err = reference.WithTag(ref, tag.DefaultTag); err != nil {
					return
				}
			}

			for _, t := range imgDescr[id].refs {
				if tagged.String() == t.String() {
					return
				}
			}
			imgDescr[id].refs = append(imgDescr[id].refs, tagged)
		}
	}

	for _, name := range names {
		ref, err := reference.ParseNamed(name)
		if err != nil {
			return nil, err
		}
		ref = registry.NormalizeLocalReference(ref)
		if ref.Name() == string(digest.Canonical) {
			imgID, err := l.is.Search(name)
			if err != nil {
				return nil, err
			}
			addAssoc(imgID, nil)
			continue
		}
		if _, ok := ref.(reference.Digested); !ok {
			if _, ok := ref.(reference.NamedTagged); !ok {
				assocs := l.ts.ReferencesByName(ref)
				for _, assoc := range assocs {
					addAssoc(assoc.ImageID, assoc.Ref)
				}
				if len(assocs) == 0 {
					imgID, err := l.is.Search(name)
					if err != nil {
						return nil, err
					}
					addAssoc(imgID, nil)
				}
				continue
			}
		}
		var imgID image.ID
		if imgID, err = l.ts.Get(ref); err != nil {
			return nil, err
		}
		addAssoc(imgID, ref)

	}
	return imgDescr, nil
}
示例#5
0
// Pull initiates a pull operation. image is the repository name to pull, and
// tag may be either empty, or indicate a specific tag to pull.
func Pull(ctx context.Context, ref reference.Named, imagePullConfig *ImagePullConfig) error {
	// Resolve the Repository name from fqn to RepositoryInfo
	repoInfo, err := imagePullConfig.RegistryService.ResolveRepository(ref)
	if err != nil {
		return err
	}

	// makes sure name is not empty or `scratch`
	if err := validateRepoName(repoInfo.LocalName.Name()); err != nil {
		return err
	}

	endpoints, err := imagePullConfig.RegistryService.LookupPullEndpoints(repoInfo.CanonicalName)
	if err != nil {
		return err
	}

	localName := registry.NormalizeLocalReference(ref)

	var (
		// use a slice to append the error strings and return a joined string to caller
		errors []string

		// discardNoSupportErrors is used to track whether an endpoint encountered an error of type registry.ErrNoSupport
		// By default it is false, which means that if a ErrNoSupport error is encountered, it will be saved in errors.
		// As soon as another kind of error is encountered, discardNoSupportErrors is set to true, avoiding the saving of
		// any subsequent ErrNoSupport errors in errors.
		// It's needed for pull-by-digest on v1 endpoints: if there are only v1 endpoints configured, the error should be
		// returned and displayed, but if there was a v2 endpoint which supports pull-by-digest, then the last relevant
		// error is the ones from v2 endpoints not v1.
		discardNoSupportErrors bool
	)
	for _, endpoint := range endpoints {
		logrus.Debugf("Trying to pull %s from %s %s", repoInfo.LocalName, endpoint.URL, endpoint.Version)

		puller, err := newPuller(endpoint, repoInfo, imagePullConfig)
		if err != nil {
			errors = append(errors, err.Error())
			continue
		}
		if fallback, err := puller.Pull(ctx, ref); err != nil {
			// Was this pull cancelled? If so, don't try to fall
			// back.
			select {
			case <-ctx.Done():
				fallback = false
			default:
			}
			if fallback {
				if _, ok := err.(registry.ErrNoSupport); !ok {
					// Because we found an error that's not ErrNoSupport, discard all subsequent ErrNoSupport errors.
					discardNoSupportErrors = true
					// append subsequent errors
					errors = append(errors, err.Error())
				} else if !discardNoSupportErrors {
					// Save the ErrNoSupport error, because it's either the first error or all encountered errors
					// were also ErrNoSupport errors.
					// append subsequent errors
					errors = append(errors, err.Error())
				}
				continue
			}
			errors = append(errors, err.Error())
			logrus.Debugf("Not continuing with error: %v", fmt.Errorf(strings.Join(errors, "\n")))
			if len(errors) > 0 {
				return fmt.Errorf(strings.Join(errors, "\n"))
			}
		}

		imagePullConfig.EventsService.Log("pull", localName.String(), "")
		return nil
	}

	if len(errors) == 0 {
		return fmt.Errorf("no endpoints found for %s", ref.String())
	}

	if len(errors) > 0 {
		return fmt.Errorf(strings.Join(errors, "\n"))
	}
	return nil
}