rc, err := cli.ImagePull(context.Background(), types.ImagePullOptions{
        ImageID: containerConfig.Image,
        Tag:     tag,
    }, nil)
    if err != nil {
        return err
    }
    defer rc.Close()
    dec := json.NewDecoder(rc)
    for {
        var message jsonmessage.JSONMessage
        if err := dec.Decode(&message); err != nil {
            if err == io.EOF {
                break
            }
            return err
        }
        log.Infof("ImagePull response: %s", message)
    }