code: func (al *archiveLogger) Fprintf(w io.Writer, format string, a ...interface{}) (n int, err error) {
  	prefix := "\n"
  	if al.quiet {
  		prefix = ""
  	}
  	args := []interface{}{prefix}
  	args = append(args, a...)
  	return fmt.Printf("%s"+format, args...)
  }
docs: // Print acts like fmt.fprintf, but may prepend a prefix to format, depending on the value of al.quiet.