func (s *Image) Pull() error {
	_, err := s.docker.Run("pull", s.name)
	if err != nil {
		return err
	}

	return nil
}
func (s *Image) Pull() error {
	_, err := s.docker.Run("pull", s.name)
	if err != nil {
		return err
	}

	return nil
}
// Pull retrieves current Docker image from Docker repository.
//
// Returns ExternalCmdError on error.