code: func (os *OpenStack) getVolume(volumeID string) (Volume, error) {
  	volumes, err := os.volumeService("")
  	if err != nil {
  		return Volume{}, fmt.Errorf("unable to initialize cinder client for region: %s, err: %v", os.region, err)
  	}
  	return volumes.getVolume(volumeID)
  }
docs: // getVolume retrieves Volume by its ID.