code: func emptyGarbage() error {
  	if err := pkgPod.WalkPods(getDataDir(), pkgPod.IncludeGarbageDir, func(p *pkgPod.Pod) {
  		if err := p.ExclusiveLock(); err != nil {
  			return
  		}
  		stdout.Printf("Garbage collecting pod %q", p.UUID)
  
  		deletePod(p)
  	}); err != nil {
  		return err
  	}
  
  	return nil
  }
docs: // emptyGarbage discards everything from garbageDir()