code: func (h *Holder) logStartup() error {
  	time, err := time.Now().MarshalText()
  	if err != nil {
  		return errors.Wrap(err, "creating timestamp")
  	}
  	logLine := fmt.Sprintf("%s\t%s\n", time, Version)
  
  	f, err := os.OpenFile(h.Path+"/.startup.log", os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0600)
  	if err != nil {
  		return errors.Wrap(err, "opening startup log")
  	}
  
  	defer f.Close()
  
  	if _, err = f.WriteString(logLine); err != nil {
  		return errors.Wrap(err, "writing startup log")
  	}
  
  	return nil
  }
docs: // Log startup time and version to $DATA_DIR/.startup.log