package daemon
 
 import (

 	"github.com/docker/distribution/reference"

 	"github.com/docker/docker/image"
 )
 
 // 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.GetImageIDAndOS(imageName)

 	if err != nil {
 		return err
 	}
 

 	newTag, err := reference.ParseNormalizedNamed(repository)

 	if err != nil {
 		return err
 	}
 	if tag != "" {

 		if newTag, err = reference.WithTag(reference.TrimNamed(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.Digest(), true); err != nil {

 		return err
 	}
 

 	if err := daemon.imageStore.SetLastUpdated(imageID); err != nil {

 		return err
 	}

 	daemon.LogImageEvent(imageID.String(), reference.FamiliarString(newTag), "tag")

 	return nil
 }