func tagReferenceToTagEvent(stream *api.ImageStream, tagRef api.TagReference, tagOrID string) (*api.TagEvent, error) {
switch tagRef.From.Kind {
case "DockerImage":
return &api.TagEvent{
Created: util.Now(),
DockerImageReference: tagRef.From.Name,
}, nil
case "ImageStreamImage":
ref, err := api.DockerImageReferenceForStream(stream)
if err != nil {
return nil, err
}
resolvedIDs := api.ResolveImageID(stream, tagOrID)
switch len(resolvedIDs) {
case 1:
ref.ID = resolvedIDs.List()[0]
return &api.TagEvent{
Created: util.Now(),
DockerImageReference: ref.String(),
Image: ref.ID,
}, nil
case 0:
return nil, fmt.Errorf("no images match the prefix %q", tagOrID)
default:
return nil, fmt.Errorf("multiple images match the prefix %q: %s", tagOrID, strings.Join(resolvedIDs.List(), ", "))
}
case "ImageStreamTag":
return api.LatestTaggedImage(stream, tagOrID), nil
default:
return nil, fmt.Errorf("invalid from.kind %q: it must be ImageStreamImage or ImageStreamTag", tagRef.From.Kind)
}
}
// Get retrieves an image by ID that has previously been tagged into an image stream.
// `id` is of the form <repo name>@<image id>.
func (r *REST) Get(ctx kapi.Context, id string) (runtime.Object, error) {
name, imageID, err := ParseNameAndID(id)
if err != nil {
return nil, err
}
repo, err := r.imageStreamRegistry.GetImageStream(ctx, name)
if err != nil {
return nil, err
}
if repo.Status.Tags == nil {
return nil, errors.NewNotFound("imageStreamImage", imageID)
}
set := api.ResolveImageID(repo, imageID)
switch len(set) {
case 1:
imageName := set.List()[0]
image, err := r.imageRegistry.GetImage(ctx, imageName)
if err != nil {
return nil, err
}
imageWithMetadata, err := api.ImageWithMetadata(*image)
if err != nil {
return nil, err
}
if d, err := digest.ParseDigest(imageName); err == nil {
imageName = d.Hex()
}
if len(imageName) > 7 {
imageName = imageName[:7]
}
isi := api.ImageStreamImage{
ObjectMeta: kapi.ObjectMeta{
Namespace: kapi.NamespaceValue(ctx),
Name: fmt.Sprintf("%s@%s", name, imageName),
},
Image: *imageWithMetadata,
}
return &isi, nil
case 0:
return nil, errors.NewNotFound("imageStreamImage", imageID)
default:
return nil, errors.NewConflict("imageStreamImage", imageID, fmt.Errorf("multiple images match the prefix %q: %s", imageID, strings.Join(set.List(), ", ")))
}
}