// dir.DebugDir, as follows:
	//  1. If LogWriter is present, log to it.
	//  2. If DebugDir is present, log to a file within it.
	//  3. If both LogWriter and DebugDir are present, log to a multi writer.
	//  4. If neither LogWriter nor DebugDir are present, log to a noop logger.
	var logWriters []io.Writer
	logFile, err := debugLogFile(dir.DebugDir())
	if err != nil {
		logFile = nil
	}