code: func (d *Driver) GetIP() (string, error) {
  	c, err := newComputeUtil(d)
  	if err != nil {
  		return "", err
  	}
  
  	ip, err := c.ip()
  	if err != nil {
  		return "", err
  	}
  	if ip == "" {
  		return "", drivers.ErrHostIsNotRunning
  	}
  
  	return ip, nil
  }
docs: // GetIP returns the IP address of the GCE instance.