Change:
<del> { config, lib, pkgs, ... }: with lib; let cfg = config.services.gitit; homeDir = "/var/lib/gitit"; toYesNo = b: if b then "yes" else "no"; gititShared = with cfg.haskellPackages; gitit + "/share/" + ghc.targetPrefix + ghc.haskellCompilerName + "/" + gitit.pname + "-" + gitit.version; gititWithPkgs = hsPkgs: extras: hsPkgs.ghcWithPackages (self: with self; [ gitit ] ++ (extras self)); gititSh = hsPkgs: extras: with pkgs; let env = gititWithPkgs hsPkgs extras; in writeScript "gitit" '' #!${runtimeShell} cd $HOME export NIX_GHC="${env}/bin/ghc" export NIX_GHCPKG="${env}/bin/ghc-pkg" export NIX_GHC_DOCDIR="${env}/share/doc/ghc/html" export NIX_GHC_LIBDIR=$( $NIX_GHC --print-libdir ) ${env}/bin/gitit -f ${configFile} ''; gititOptions = { enable = mkOption { type = types.bool; default = false; description = lib.mdDoc "Enable the gitit service."; }; haskellPackages = mkOption { default = pkgs.haskellPackages; defaultText = literalExpression "pkgs.haskellPackages"; example = literalExpression "pkgs.haskell.packages.ghc784"; description = lib.mdDoc "haskellPackages used to build gitit and plugins."; }; extraPackages = mkOption { type = types.functionTo (types.listOf types.package); default = self: []; example = literalExpression '' haskellPackages: [ haskellPackages.wreq ] ''; description = lib.mdDoc '' Extra packages available to ghc when running gitit. The value must be a function which receives the attrset defined in {var}`haskellPackages` as the sole argument. ''; }; address = mkOption { type = types.str; default = "0.0.0.0"; description = lib.mdDoc "IP address on which the web server will listen."; }; port = mkOption { type = types.int; default = 5001; description = lib.mdDoc "Port on which the web server will run."; }; wikiTitle = mkOption { type = types.str; default = "Gitit!"; description = lib.mdDoc "The wiki title."; }; repositoryType = mkOption { type = types.enum ["git" "darcs" "mercurial"]; default = "git"; description = lib.mdDoc "Specifies the type of repository used for wiki content."; }; repositoryPath = mkOption { type = types.path; default = homeDir + "/wiki"; description = lib.mdDoc '' Specifies the path of the repository directory. If it does not exist, gitit will create it on startup. ''; }; requireAuthentication = mkOption { type = types.enum [ "none" "modify" "read" ]; default = "modify"; description = lib.mdDoc '' If 'none', login is never required, and pages can be edited anonymously.  If 'modify', login is required to modify the wiki (edit, add, delete pages, upload files).  If 'read', login is required to see any wiki pages. ''; }; authenticationMethod = mkOption { type = types.enum [ "form" "http" "generic" "github" ]; default = "form"; description = lib.mdDoc '' 'form' means that users will be logged in and registered using forms in the gitit web interface.  'http' means that gitit will assume that HTTP authentication is in place and take the logged in username from the "Authorization" field of the HTTP request header (in addition, the login/logout and registration links will be suppressed). 'generic' means that gitit will assume that some form of authentication is in place that directly sets REMOTE_USER to the name of the authenticated user (e.g. mod_auth_cas on apache).  'rpx' means that gitit will attempt to log in through https://rpxnow.com.  This requires that 'rpx-domain', 'rpx-key', and 'base-url' be set below, and that 'curl' be in the system path. ''; }; userFile = mkOption { type = types.path; default = homeDir + "/gitit-users"; description = lib.mdDoc '' Specifies the path of the file containing user login information.  If it does not exist, gitit will create it (with an empty user list). This file is not used if 'http' is selected for authentication-method. ''; }; sessionTimeout = mkOption { type = types.int; default = 60; description = lib.mdDoc '' Number of minutes of inactivity before a session expires. ''; }; staticDir = mkOption { type = types.path; default = gititShared + "/data/static"; description = lib.mdDoc '' Specifies the path of the static directory (containing javascript, css, and images).  If it does not exist, gitit will create it and populate it with required scripts, stylesheets, and images. ''; }; defaultPageType = mkOption { type = types.enum [ "markdown" "rst" "latex" "html" "markdown+lhs" "rst+lhs" "latex+lhs" ]; default = "markdown"; description = lib.mdDoc '' Specifies the type of markup used to interpret pages in the wiki. Possible values are markdown, rst, latex, html, markdown+lhs, rst+lhs, and latex+lhs. (the +lhs variants treat the input as literate Haskell. See pandoc's documentation for more details.) If Markdown is selected, pandoc's syntax extensions (for footnotes, delimited code blocks, etc.) will be enabled. Note that pandoc's restructuredtext parser is not complete, so some pages may not be rendered correctly if rst is selected. The same goes for latex and html. ''; }; math = mkOption { type = types.enum [ "mathml" "raw" "mathjax" "jsmath" "google" ]; default = "mathml"; description = lib.mdDoc '' Specifies how LaTeX math is to be displayed.  Possible values are mathml, raw, mathjax, jsmath, and google.  If mathml is selected, gitit will convert LaTeX math to MathML and link in a script, MathMLinHTML.js, that allows the MathML to be seen in Gecko browsers, IE + mathplayer, and Opera. In other browsers you may get a jumble of characters.  If raw is selected, the LaTeX math will be displayed as raw LaTeX math.  If mathjax is selected, gitit will link to the remote mathjax script.  If jsMath is selected, gitit will link to the script /js/jsMath/easy/load.js, and will assume that jsMath has been installed into the js/jsMath directory.  This is the most portable solution. If google is selected, the google chart API is called to render the formula as an image. This requires a connection to google, and might raise a technical or a privacy problem. ''; }; mathJaxScript = mkOption { type = types.str; default = "https://d3eoax9i5htok0.cloudfront.net/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"; description = lib.mdDoc '' Specifies the path to MathJax rendering script.  You might want to use your own MathJax script to render formulas without Internet connection or if you want to use some special LaTeX packages.  Note: path specified there cannot be an absolute path to a script on your hdd, instead you should run your (local if you wish) HTTP server which will serve the MathJax.js script. You can easily (in four lines of code) serve MathJax.js using http://happstack.com/docs/crashcourse/FileServing.html Do not forget the "http://" prefix (e.g. http://localhost:1234/MathJax.js). ''; }; showLhsBirdTracks = mkOption { type = types.bool; default = false; description = lib.mdDoc '' Specifies whether to show Haskell code blocks in "bird style", with "> " at the beginning of each line. ''; }; templatesDir = mkOption { type = types.path; default = gititShared + "/data/templates"; description = lib.mdDoc '' Specifies the path of the directory containing page templates.  If it does not exist, gitit will create it with default templates.  Users may wish to edit the templates to customize the appearance of their wiki. The template files are HStringTemplate templates.  Variables to be interpolated appear between $'s. Literal $'s must be backslash-escaped. ''; }; logFile = mkOption { type = types.path; default = homeDir + "/gitit.log"; description = lib.mdDoc '' Specifies the path of gitit's log file.  If it does not exist, gitit will create it. The log is in Apache combined log format. ''; }; logLevel = mkOption { type = types.enum [ "DEBUG" "INFO" "NOTICE" "WARNING" "ERROR" "CRITICAL" "ALERT" "EMERGENCY" ]; default = "ERROR"; description = lib.mdDoc '' Determines how much information is logged.  Possible values (from most to least verbose) are DEBUG, INFO, NOTICE, WARNING, ERROR, CRITICAL, ALERT, EMERGENCY. ''; }; frontPage = mkOption { type = types.str; default = "Front Page"; description = lib.mdDoc '' Specifies which wiki page is to be used as the wiki's front page. Gitit creates a default front page on startup, if one does not exist already. ''; }; noDelete = mkOption { type = types.str; default = "Front Page, Help"; description = lib.mdDoc '' Specifies pages that cannot be deleted through the web interface. (They can still be deleted directly using git or darcs.) A comma-separated list of page names.  Leave blank to allow every page to be deleted. ''; }; noEdit = mkOption { type = types.str; default = "Help"; description = lib.mdDoc '' Specifies pages that cannot be edited through the web interface. Leave blank to allow every page to be edited. ''; }; defaultSummary = mkOption { type = types.str; default = ""; description = lib.mdDoc '' Specifies text to be used in the change description if the author leaves the "description" field blank.  If default-summary is blank (the default), the author will be required to fill in the description field. ''; }; tableOfContents = mkOption { type = types.bool; default = true; description = lib.mdDoc '' Specifies whether to print a tables of contents (with links to sections) on each wiki page. ''; }; plugins = mkOption { type = with types; listOf str; default = [ (gititShared + "/plugins/Dot.hs") ]; description = lib.mdDoc '' Specifies a list of plugins to load. Plugins may be specified either by their path or by their module name. If the plugin name starts with Gitit.Plugin., gitit will assume that the plugin is an installed module and will not try to find a source file. ''; }; useCache = mkOption { type = types.bool; default = false; description = lib.mdDoc '' Specifies whether to cache rendered pages.  Note that if use-feed is selected, feeds will be cached regardless of the value of use-cache. ''; }; cacheDir = mkOption { type = types.path; default = homeDir + "/cache"; description = lib.mdDoc "Path where rendered pages will be cached."; }; maxUploadSize = mkOption { type = types.str; default = "1000K"; description = lib.mdDoc '' Specifies an upper limit on the size (in bytes) of files uploaded through the wiki's web interface.  To disable uploads, set this to 0K.  This will result in the uploads link disappearing and the _upload url becoming inactive. ''; }; maxPageSize = mkOption { type = types.str; default = "1000K"; description = lib.mdDoc "Specifies an upper limit on the size (in bytes) of pages."; }; debugMode = mkOption { type = types.bool; default = false; description = lib.mdDoc "Causes debug information to be logged while gitit is running."; }; compressResponses = mkOption { type = types.bool; default = true; description = lib.mdDoc "Specifies whether HTTP responses should be compressed."; }; mimeTypesFile = mkOption { type = types.path; default = "/etc/mime/types.info"; description = lib.mdDoc '' Specifies the path of a file containing mime type mappings.  Each line of the file should contain two fields, separated by whitespace. The first field is the mime type, the second is a file extension. For example: ``` video/x-ms-wmx  wmx ``` If the file is not found, some simple defaults will be used. ''; }; useReCaptcha = mkOption { type = types.bool; default = false; description = lib.mdDoc '' If true, causes gitit to use the reCAPTCHA service (http://recaptcha.net) to prevent bots from creating accounts. ''; }; reCaptchaPrivateKey = mkOption { type = with types; nullOr str; default = null; description = lib.mdDoc '' Specifies the private key for the reCAPTCHA service.  To get these, you need to create an account at http://recaptcha.net. ''; }; reCaptchaPublicKey = mkOption { type = with types; nullOr str; default = null; description = lib.mdDoc '' Specifies the public key for the reCAPTCHA service.  To get these, you need to create an account at http://recaptcha.net. ''; }; accessQuestion = mkOption { type = types.str; default = "What is the code given to you by Ms. X?"; description = lib.mdDoc '' Specifies a question that users must answer when they attempt to create an account ''; }; accessQuestionAnswers = mkOption { type = types.str; default = "RED DOG, red dog"; description = lib.mdDoc '' Specifies a question that users must answer when they attempt to create an account, along with a comma-separated list of acceptable answers.  This can be used to institute a rudimentary password for signing up as a user on the wiki, or as an alternative to reCAPTCHA. Example: access-question:  What is the code given to you by Ms. X? access-question-answers:  RED DOG, red dog ''; }; rpxDomain = mkOption { type = with types; nullOr str; default = null; description = lib.mdDoc '' Specifies the domain and key of your RPX account.  The domain is just the prefix of the complete RPX domain, so if your full domain is 'https://foo.rpxnow.com/', use 'foo' as the value of rpx-domain. ''; }; rpxKey = mkOption { type = with types; nullOr str; default = null; description = lib.mdDoc "RPX account access key."; }; mailCommand = mkOption { type = types.str; default = "sendmail %s"; description = lib.mdDoc '' Specifies the command to use to send notification emails.  '%s' will be replaced by the destination email address.  The body of the message will be read from stdin.  If this field is left blank, password reset will not be offered. ''; }; resetPasswordMessage = mkOption { type = types.lines; default = '' > From: gitit@$hostname$ > To: $useremail$ > Subject: Wiki password reset > > Hello $username$, > > To reset your password, please follow the link below: > http://$hostname$:$port$$resetlink$ > > Regards ''; description = lib.mdDoc '' Gives the text of the message that will be sent to the user should she want to reset her password, or change other registration info. The lines must be indented, and must begin with '>'.  The initial spaces and '> ' will be stripped off.  $username$ will be replaced by the user's username, $useremail$ by her email address, $hostname$ by the hostname on which the wiki is running (as returned by the hostname system call), $port$ by the port on which the wiki is running, and $resetlink$ by the relative path of a reset link derived from the user's existing hashed password. If your gitit wiki is being proxied to a location other than the root path of $port$, you should change the link to reflect this: for example, to http://$hostname$/path/to/wiki$resetlink$ or http://gitit.$hostname$$resetlink$ ''; }; useFeed = mkOption { type = types.bool; default = false; description = lib.mdDoc '' Specifies whether an ATOM feed should be enabled (for the site and for individual pages). ''; }; baseUrl = mkOption { type = with types; nullOr str; default = null; description = lib.mdDoc '' The base URL of the wiki, to be used in constructing feed IDs and RPX token_urls.  Set this if useFeed is false or authentication-method is 'rpx'. ''; }; absoluteUrls = mkOption { type = types.bool; default = false; description = lib.mdDoc '' Make wikilinks absolute with respect to the base-url.  So, for example, in a wiki served at the base URL '/wiki', on a page Sub/Page, the wikilink `[Cactus]()` will produce a link to '/wiki/Cactus' if absoluteUrls is true, and a relative link to 'Cactus' (referring to '/wiki/Sub/Cactus') if absolute-urls is 'no'. ''; }; feedDays = mkOption { type = types.int; default = 14; description = lib.mdDoc "Number of days to be included in feeds."; }; feedRefreshTime = mkOption { type = types.int; default = 60; description = lib.mdDoc "Number of minutes to cache feeds before refreshing."; }; pdfExport = mkOption { type = types.bool; default = false; description = lib.mdDoc '' If true, PDF will appear in export options. PDF will be created using pdflatex, which must be installed and in the path. Note that PDF exports create significant additional server load. ''; }; pandocUserData = mkOption { type = with types; nullOr path; default = null; description = lib.mdDoc '' If a directory is specified, this will be searched for pandoc customizations. These can include a templates/ directory for custom templates for various export formats, an S5 directory for custom S5 styles, and a reference.odt for ODT exports. If no directory is specified, $HOME/.pandoc will be searched. See pandoc's README for more information. ''; }; xssSanitize = mkOption { type = types.bool; default = true; description = lib.mdDoc '' If true, all HTML (including that produced by pandoc) is filtered through xss-sanitize.  Set to no only if you trust all of your users. ''; }; oauthClientId = mkOption { type = with types; nullOr str; default = null; description = lib.mdDoc "OAuth client ID"; }; oauthClientSecret = mkOption { type = with types; nullOr str; default = null; description = lib.mdDoc "OAuth client secret"; }; oauthCallback = mkOption { type = with types; nullOr str; default = null; description = lib.mdDoc "OAuth callback URL"; }; oauthAuthorizeEndpoint = mkOption { type = with types; nullOr str; default = null; description = lib.mdDoc "OAuth authorize endpoint"; }; oauthAccessTokenEndpoint = mkOption { type = with types; nullOr str; default = null; description = lib.mdDoc "OAuth access token endpoint"; }; githubOrg = mkOption { type = with types; nullOr str; default = null; description = lib.mdDoc "Github organization"; }; }; configFile = pkgs.writeText "gitit.conf" '' address: ${cfg.address} port: ${toString cfg.port} wiki-title: ${cfg.wikiTitle} repository-type: ${cfg.repositoryType} repository-path: ${cfg.repositoryPath} require-authentication: ${cfg.requireAuthentication} authentication-method: ${cfg.authenticationMethod} user-file: ${cfg.userFile} session-timeout: ${toString cfg.sessionTimeout} static-dir: ${cfg.staticDir} default-page-type: ${cfg.defaultPageType} math: ${cfg.math} mathjax-script: ${cfg.mathJaxScript} show-lhs-bird-tracks: ${toYesNo cfg.showLhsBirdTracks} templates-dir: ${cfg.templatesDir} log-file: ${cfg.logFile} log-level: ${cfg.logLevel} front-page: ${cfg.frontPage} no-delete: ${cfg.noDelete} no-edit: ${cfg.noEdit} default-summary: ${cfg.defaultSummary} table-of-contents: ${toYesNo cfg.tableOfContents} plugins: ${concatStringsSep "," cfg.plugins} use-cache: ${toYesNo cfg.useCache} cache-dir: ${cfg.cacheDir} max-upload-size: ${cfg.maxUploadSize} max-page-size: ${cfg.maxPageSize} debug-mode: ${toYesNo cfg.debugMode} compress-responses: ${toYesNo cfg.compressResponses} mime-types-file: ${cfg.mimeTypesFile} use-recaptcha: ${toYesNo cfg.useReCaptcha} recaptcha-private-key: ${toString cfg.reCaptchaPrivateKey} recaptcha-public-key: ${toString cfg.reCaptchaPublicKey} access-question: ${cfg.accessQuestion} access-question-answers: ${cfg.accessQuestionAnswers} rpx-domain: ${toString cfg.rpxDomain} rpx-key: ${toString cfg.rpxKey} mail-command: ${cfg.mailCommand} reset-password-message: ${cfg.resetPasswordMessage} use-feed: ${toYesNo cfg.useFeed} base-url: ${toString cfg.baseUrl} absolute-urls: ${toYesNo cfg.absoluteUrls} feed-days: ${toString cfg.feedDays} feed-refresh-time: ${toString cfg.feedRefreshTime} pdf-export: ${toYesNo cfg.pdfExport} pandoc-user-data: ${toString cfg.pandocUserData} xss-sanitize: ${toYesNo cfg.xssSanitize} [Github] oauthclientid: ${toString cfg.oauthClientId} oauthclientsecret: ${toString cfg.oauthClientSecret} oauthcallback: ${toString cfg.oauthCallback} oauthauthorizeendpoint: ${toString cfg.oauthAuthorizeEndpoint} oauthaccesstokenendpoint: ${toString cfg.oauthAccessTokenEndpoint} github-org: ${toString cfg.githubOrg} ''; in { options.services.gitit = gititOptions; config = mkIf cfg.enable { users.users.gitit = { group = config.users.groups.gitit.name; description = "Gitit user"; home = homeDir; createHome = true; uid = config.ids.uids.gitit; }; users.groups.gitit.gid = config.ids.gids.gitit; systemd.services.gitit = let uid = toString config.ids.uids.gitit; gid = toString config.ids.gids.gitit; in { description = "Git and Pandoc Powered Wiki"; after = [ "network.target" ]; wantedBy = [ "multi-user.target" ]; path = with pkgs; [ curl ] ++ optional cfg.pdfExport texlive.combined.scheme-basic ++ optional (cfg.repositoryType == "darcs") darcs ++ optional (cfg.repositoryType == "mercurial") mercurial ++ optional (cfg.repositoryType == "git") git; preStart = let gm = "gitit@${config.networking.hostName}"; in with cfg; '' chown ${uid}:${gid} -R ${homeDir} for dir in ${repositoryPath} ${staticDir} ${templatesDir} ${cacheDir} do if [ ! -d $dir ] then mkdir -p $dir find $dir -type d -exec chmod 0750 {} + find $dir -type f -exec chmod 0640 {} + fi done cd ${repositoryPath} ${ if repositoryType == "darcs" then '' if [ ! -d _darcs ] then darcs initialize echo "${gm}" > _darcs/prefs/email '' else if repositoryType == "mercurial" then '' if [ ! -d .hg ] then hg init cat >> .hg/hgrc <<NAMED [ui] username = gitit ${gm} NAMED '' else '' if [ ! -d  .git ] then git init git config user.email "${gm}" git config user.name "gitit" ''} chown ${uid}:${gid} -R ${repositoryPath} fi cd - ''; serviceConfig = { User = config.users.users.gitit.name; Group = config.users.groups.gitit.name; ExecStart = with cfg; gititSh haskellPackages extraPackages; }; }; }; } </del>

Discussion:
This is essentially a repost of : We have a NixOS module for gitit in nixpkgs which due to its impact on evaluation performance. It continued to be shipped, so that one could include it manually, but it has bitrotted since then. One thing I noticed is that it makes an incorrect assumption where gitit's data files would be located, but there may be more issues. It would be great if we could either find someone willing to fix the module up or drop it altogether.
This issue has been mentioned on NixOS Discourse. There might be relevant details there:
if someone wants to fix it then the options should be converted to freeform and
At this time, I don't see anymore, neither in 22.11, neither in unstable. I am closing.
I still see on master. It was however excluded from evaluation in Edit: wrong commit, that just a space. . So it hasn't been evaluated since 2015… There's also some comments on that commit.
Oh thank you for correcting me. I used I am in favor of dropping it, I guess. It's not easy to discover and someone else can revive it at some point.
see IMO if nobody has stepped up in the years since, it hasn't been a priority to anyone. We can wait a few days for comments on . Then again, if someone still needs it, they can always revert/take it from the history.