public async Task SyncGitLocalRepositoryDirToWebRootDirAsync(string gitLocalRootDir, string webLocalRootDir, CancellationToken cancel = default)
    {
        string gitCommitId = await Lfs.GetCurrentGitCommitIdAsync(gitLocalRootDir, cancel);

        var param = new CopyDirectoryParams(
            CopyDirectoryFlags.AsyncCopy | CopyDirectoryFlags.Overwrite | CopyDirectoryFlags.Recursive | CopyDirectoryFlags.DeleteNotExistDirs | CopyDirectoryFlags.DeleteNotExistFiles | CopyDirectoryFlags.SilenceSuccessfulReport,
            FileFlags.WriteOnlyIfChanged,
            new FileMetadataCopier(FileMetadataCopyMode.TimeAll),
            new FileMetadataCopier(FileMetadataCopyMode.TimeAll),
            determineToCopyCallback: (d, e) =>
        {
            if (e.IsFile && e.Name._IsSamei(Consts.FileNames.GitLabMainte_PublishFileName))
            {
                return(false);
            }
            if (e.IsDirectory && e.Name._IsSamei(".git"))
            {
                return(false);
            }
            return(true);
        },
            determineToDeleteCallback: (e) =>
        {
            if (e.IsFile && e.Name._IsSamei(Consts.FileNames.GitLabMainte_CommitIdFileName))
            {
                return(false);
            }
            if (e.IsFile && e.Name._IsSamei(Consts.FileNames.LogBrowserSecureJson))
            {
                return(false);
            }
            if (e.IsDirectory && e.Name._IsSamei(Consts.FileNames.LogBrowserAccessLogDirName))
            {
                return(false);
            }
            return(true);
        }
            );

        string publishPath = gitLocalRootDir._CombinePath(Consts.FileNames.GitLabMainte_PublishFileName);

        await Lfs.CopyDirAsync(gitLocalRootDir, webLocalRootDir, param : param, cancel : cancel);

        await Lfs.WriteStringToFileAsync(webLocalRootDir._CombinePath(Consts.FileNames.GitLabMainte_CommitIdFileName),
                                         gitCommitId + "\n",
                                         FileFlags.WriteOnlyIfChanged,
                                         cancel : cancel);

        PublishConfigData?config = await Lfs.ReadJsonFromFileAsync <PublishConfigData>(publishPath, cancel : cancel, nullIfError : true);

        if (config == null)
        {
            if (await Lfs.IsFileExistsAsync(publishPath))
            {
                config = new PublishConfigData();
            }
        }

        string secureJsonPath = webLocalRootDir._CombinePath(Consts.FileNames.LogBrowserSecureJson);

        if (config == null)
        {
            try
            {
                await Lfs.DeleteFileAsync(secureJsonPath, cancel : cancel);
            }
            catch (Exception ex)
            {
                ex._Error();
            }
        }
        else
        {
            bool requireAuth = config.Username._IsFilled() && config.Password._IsFilled();

            LogBrowserSecureJson sj = new LogBrowserSecureJson();

            sj.AuthRequired = requireAuth;

            if (requireAuth)
            {
                sj.AuthDatabase = new KeyValueList <string, string>();
                sj.AuthDatabase.Add(config.Username, config.Password);
                sj.AuthSubDirName = "auth";
            }
            sj.DisableAccessLog = false;
            sj.AllowZipDownload = true;

            await Lfs.WriteJsonToFileAsync(secureJsonPath, sj, FileFlags.WriteOnlyIfChanged, cancel : cancel);
        }
    }
    // Git リポジトリの自動ダウンロード
    async Task Loop2_MainteUsersAsync(CancellationToken cancel = default)
    {
        long lastHookTick = -1;

        while (cancel.IsCancellationRequested == false)
        {
            try
            {
                await Lfs.CreateDirectoryAsync(this.Settings.GitMirrorDataRootDir);

                await Lfs.CreateDirectoryAsync(this.Settings.GitWebDataRootDir);
            }
            catch
            {
            }

            try
            {
                // Git リポジトリを列挙
                var projects = await this.GitLabClient.EnumProjectsAsync(cancel);

                ConcurrentHashSet <string> dirNames = new ConcurrentHashSet <string>(StrCmpi);

                // メモ: last_activity_at の値を信用してはならない。これは GitLab がキャッシュしているので、なかなか更新されない。

                var targetProjects = projects.Where(p => p.empty_repo == false && p.path_with_namespace._IsFilled() && p.default_branch._IsFilled() && p.visibility._IsDiffi("private")).OrderByDescending(x => x.last_activity_at).ThenBy(x => x.path_with_namespace, StrCmpi);

                await TaskUtil.ForEachAsync(8, targetProjects, async (proj, index, cancel) =>
                {
                    cancel.ThrowIfCancellationRequested();

                    try
                    {
                        string dirname = proj.GenerateDirName();

                        dirNames.Add(dirname);

                        string gitRoot = this.Settings.GitMirrorDataRootDir._CombinePath(dirname);
                        string webRoot = this.Settings.GitWebDataRootDir._CombinePath(dirname);

                        await this.GitLabClient.GitPullFromRepositoryAsync(proj.path_with_namespace !, gitRoot, proj.default_branch !, cancel);

                        await this.SyncGitLocalRepositoryDirToWebRootDirAsync(gitRoot, webRoot, cancel);
                    }
                    catch (Exception ex)
                    {
                        ex._Error();
                    }
                }, cancel);

                // GitLab 上に存在せず local に存在する gitRoot を列挙して削除する
                var existingLocalGitDirs = await Lfs.EnumDirectoryAsync(this.Settings.GitMirrorDataRootDir, cancel : cancel);

                foreach (var d in existingLocalGitDirs.Where(x => x.IsDirectory && dirNames.Contains(x.Name) == false))
                {
                    cancel.ThrowIfCancellationRequested();

                    try
                    {
                        await Lfs.DeleteDirectoryAsync(d.FullPath, true, cancel, true);
                    }
                    catch { }
                }

                // GitLab 上に存在せず local に存在する webRoot を列挙して削除する
                var existingLocalWebDirs = await Lfs.EnumDirectoryAsync(this.Settings.GitWebDataRootDir, cancel : cancel);

                foreach (var d in existingLocalWebDirs.Where(x => x.IsDirectory && dirNames.Contains(x.Name) == false))
                {
                    cancel.ThrowIfCancellationRequested();

                    try
                    {
                        await Lfs.DeleteFileAsync(d.FullPath._CombinePath(Consts.FileNames.LogBrowserSecureJson), cancel : cancel);
                    }
                    catch { }
                }
            }
            catch (Exception ex)
            {
                ex._Error();
            }

            await TaskUtil.AwaitWithPollAsync(this.Settings.ForceRepositoryUpdateIntervalMsecs, 500, () =>
            {
                long currentHookTick = this.HookFiredTick;

                if (lastHookTick != currentHookTick)
                {
                    lastHookTick = currentHookTick;
                    return(true);
                }

                return(false);
            },
                                              cancel,
                                              true);
        }
    }