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path: root/modules/nixos/git/default.nix
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{
  config,
  lib,
  libNginx,
  libPlausible,
  pkgs,
  ...
}:
with lib;
let
  cfg = config.nixfiles.modules.git;
in
{
  options.nixfiles.modules.git.server = {
    enable = mkEnableOption "Git server";

    domain = mkOption {
      description = "Domain name sans protocol scheme.";
      type = with types; nullOr str;
      default = "git.${config.networking.domain}";
    };

    package = mkOption {
      description = "Package.";
      type = types.package;
      default = pkgs.cgit;
    };
  };

  config = mkIf cfg.server.enable {
    ark.directories = [ config.services.gitolite.dataDir ];

    nixfiles.modules.nginx = {
      enable = true;
      virtualHosts.${cfg.server.domain} = {
        locations = {
          "/".extraConfig =
            let
              cgitrc = pkgs.writeText "cgitrc" ''
                root-title=github sux (⩺_⩹)
                root-desc=https://github.com/azahi

                clone-url=https://${cfg.server.domain}/$CGIT_REPO_URL

                logo=/cgit-custom-logo.gif
                favicon=/cgit-custom-favicon.gif
                css=/cgit-custom-style.css

                about-filter=${cfg.server.package}/lib/cgit/filters/about-formatting.sh
                source-filter=${cfg.server.package}/lib/cgit/filters/syntax-highlighting.py
                commit-filter=${cfg.server.package}/lib/cgit/filters/commit-links.sh

                enable-git-config=1
                enable-gitweb-owner=1
                remove-suffix=1

                readme=:README
                readme=:README.md
                readme=:README.org
                readme=:README.txt
                readme=:readme
                readme=:readme.md
                readme=:readme.org
                readme=:readme.txt

                scan-path=${config.services.gitolite.dataDir}/repositories
              '';
            in
            ''
              include ${config.services.nginx.package}/conf/fastcgi_params;
              fastcgi_split_path_info ^(/?)(.+)$;
              fastcgi_pass unix:${config.services.fcgiwrap.socketAddress};
              fastcgi_param SCRIPT_FILENAME ${cfg.server.package}/cgit/cgit.cgi;
              fastcgi_param CGIT_CONFIG ${cgitrc};
              fastcgi_param PATH_INFO $uri;
              fastcgi_param QUERY_STRING $args;
              fastcgi_param HTTP_HOST $server_name;

              ${libNginx.config.appendHead [
                ''<meta name="go-import" content="$host$uri git https://$host$uri">''
                (libPlausible.htmlPlausibleScript { inherit (cfg.server) domain; })
              ]}
            '';
          "~* ^.+(cgit.css|robots.txt)$".extraConfig = ''
            root ${cfg.server.package}/cgit;
          '';
          "~* ^.+cgit-custom-logo.gif$".extraConfig = ''
            alias ${./logo.gif};
          '';
          "~* ^.+cgit-custom-favicon.gif$".extraConfig = ''
            alias ${./favicon.ico};
          '';
          "~* ^.+cgit-custom-style.css$".extraConfig =
            let
              css = pkgs.writeText "custom.css" ''
                @import url("cgit.css");

                div#cgit {
                  font-family: monospace;
                  -moz-tab-size: 4;
                  tab-size: 4;
                }
              '';
            in
            ''
              alias ${css};
            '';
        };
      };
    };

    services =
      let
        user = "git";
        group = "git";
      in
      {
        gitolite = {
          enable = true;
          inherit user group;
          adminPubkey = my.ssh.key;
          extraGitoliteRc = ''
            # This allows hiding repositories via "cgit.ignore"[1].
            #
            # [1]: https://www.omarpolo.com/post/cgit-gitolite.html
            $RC{GIT_CONFIG_KEYS} = '.*';
          '';
        };

        fcgiwrap = {
          enable = true;
          inherit user group;
        };
      };
  };
}