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moby--moby/daemon/image_tag.go

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package daemon
import (
"github.com/docker/docker/image"
"github.com/docker/docker/reference"
)
// TagImage creates the tag specified by newTag, pointing to the image named
// imageName (alternatively, imageName can also be an image ID).
func (daemon *Daemon) TagImage(imageName, repository, tag string) error {
imageID, err := daemon.GetImageID(imageName)
if err != nil {
return err
}
newTag, err := reference.WithName(repository)
if err != nil {
return err
}
if tag != "" {
if newTag, err = reference.WithTag(newTag, tag); err != nil {
return err
}
}
return daemon.TagImageWithReference(imageID, newTag)
}
// TagImageWithReference adds the given reference to the image ID provided.
func (daemon *Daemon) TagImageWithReference(imageID image.ID, newTag reference.Named) error {
if err := daemon.referenceStore.AddTag(newTag, imageID, true); err != nil {
return err
}
daemon.LogImageEvent(imageID.String(), newTag.String(), "tag")
return nil
}