code: func (meta debMetadata) VersionString() string {
  	vsn := meta.Version
  	if meta.Env.Buildnum != "" {
  		vsn += "+build" + meta.Env.Buildnum
  	}
  	if meta.Distro != "" {
  		vsn += "+" + meta.Distro
  	}
  	return vsn
  }
docs: // VersionString returns the debian version of the packages.