package client import ( "net/url" "github.com/docker/distribution/reference" "github.com/pkg/errors" "golang.org/x/net/context" ) // ImageTag tags an image in the docker host func (cli *Client) ImageTag(ctx context.Context, source, target string) error { if _, err := reference.ParseNormalizedNamed(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 }