private fun readJournal() {
    fileSystem.read(journalFile) {
      val magic = readUtf8LineStrict()
      val version = readUtf8LineStrict()
      val appVersionString = readUtf8LineStrict()
      val valueCountString = readUtf8LineStrict()
      val blank = readUtf8LineStrict()

      if (MAGIC != magic ||
        VERSION_1 != version ||
        appVersion.toString() != appVersionString ||