package client // import "github.com/docker/docker/client"

 
 import (

 	"context"

 	"net/url"
 

 	"github.com/docker/distribution/reference"

 	"github.com/pkg/errors"

 )
 
 // ImageTag tags an image in the docker host

 func (cli *Client) ImageTag(ctx context.Context, source, target string) error {

 	if _, err := reference.ParseAnyReference(source); err != nil {

 		return errors.Wrapf(err, "Error parsing reference: %q is not a valid repository/tag", source)
 	}
 

 	ref, err := reference.ParseNormalizedNamed(target)

 	if err != nil {

 		return errors.Wrapf(err, "Error parsing reference: %q is not a valid repository/tag", target)

 	}
 

 	if _, isCanonical := ref.(reference.Canonical); isCanonical {

 		return errors.New("refusing to create a tag with a digest reference")
 	}
 

 	ref = reference.TagNameOnly(ref)

 
 	query := url.Values{}

 	query.Set("repo", reference.FamiliarName(ref))
 	if tagged, ok := ref.(reference.Tagged); ok {
 		query.Set("tag", tagged.Tag())
 	}

 	resp, err := cli.post(ctx, "/images/"+source+"/tag", query, nil, nil)

 	ensureReaderClosed(resp)
 	return err
 }