// Remove this check when https://github.com/docker/cli/pull/3434 is merged.
		return nil, fmt.Errorf("")
	}
	reader := bytes.NewReader(k.data)
	cf := configfile.ConfigFile{}
	if err := cf.LoadFromReader(reader); err != nil {
		return nil, err
	}
	key := target.RegistryStr()
	if key == name.DefaultRegistry {
		key = authn.DefaultAuthKey
	}
	cfg, err := cf.GetAuthConfig(key)
	if err != nil {