code: func IsReady(dir string) bool {
  	readyFile := filepath.Join(dir, readyFileName)
  	s, err := os.Stat(readyFile)
  	if err != nil {
  		return false
  	}
  
  	if !s.Mode().IsRegular() {
  		klog.Errorf("ready-file is not a file: %s", readyFile)
  		return false
  	}
  
  	return true
  }
docs: // IsReady checks for the existence of a regular file
  // called 'ready' in the given directory and returns
  // true if that file exists.