304 lines
		
	
	
		
			11 KiB
		
	
	
	
		
			Nix
		
	
	
	
	
	
			
		
		
	
	
			304 lines
		
	
	
		
			11 KiB
		
	
	
	
		
			Nix
		
	
	
	
	
	
{ config, lib, pkgs, ... }:
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with lib;
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let
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  cfg = config.services.moinmoin;
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  python = pkgs.python27;
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  pkg = python.pkgs.moinmoin;
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  dataDir = "/var/lib/moin";
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  usingGunicorn = cfg.webServer == "nginx-gunicorn" || cfg.webServer == "gunicorn";
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  usingNginx = cfg.webServer == "nginx-gunicorn";
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  user = "moin";
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  group = "moin";
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  uLit = s: ''u"${s}"'';
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  indentLines = n: str: concatMapStrings (line: "${fixedWidthString n " " " "}${line}\n") (splitString "\n" str);
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  moinCliWrapper = wikiIdent: pkgs.writeShellScriptBin "moin-${wikiIdent}" ''
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    ${pkgs.su}/bin/su -s ${pkgs.runtimeShell} -c "${pkg}/bin/moin --config-dir=/var/lib/moin/${wikiIdent}/config $*" ${user}
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  '';
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  wikiConfig = wikiIdent: w: ''
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    # -*- coding: utf-8 -*-
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    from MoinMoin.config import multiconfig, url_prefix_static
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    class Config(multiconfig.DefaultConfig):
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        ${optionalString (w.webLocation != "/") ''
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          url_prefix_static = '${w.webLocation}' + url_prefix_static
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        ''}
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        sitename = u'${w.siteName}'
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        page_front_page = u'${w.frontPage}'
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        data_dir = '${dataDir}/${wikiIdent}/data'
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        data_underlay_dir = '${dataDir}/${wikiIdent}/underlay'
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        language_default = u'${w.languageDefault}'
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        ${optionalString (w.superUsers != []) ''
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          superuser = [${concatMapStringsSep ", " uLit w.superUsers}]
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        ''}
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    ${indentLines 4 w.extraConfig}
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  '';
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  wikiConfigFile = name: wiki: pkgs.writeText "${name}.py" (wikiConfig name wiki);
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in
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{
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  options.services.moinmoin = with types; {
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    enable = mkEnableOption "MoinMoin Wiki Engine";
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    webServer = mkOption {
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      type = enum [ "nginx-gunicorn" "gunicorn" "none" ];
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      default = "nginx-gunicorn";
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      example = "none";
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      description = ''
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        Which web server to use to serve the wiki.
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        Use <literal>none</literal> if you want to configure this yourself.
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      '';
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    };
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    gunicorn.workers = mkOption {
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      type = ints.positive;
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      default = 3;
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      example = 10;
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      description = ''
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        The number of worker processes for handling requests.
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      '';
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    };
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    wikis = mkOption {
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      type = attrsOf (submodule ({ name, ... }: {
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        options = {
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          siteName = mkOption {
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            type = str;
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            default = "Untitled Wiki";
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            example = "ExampleWiki";
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            description = ''
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              Short description of your wiki site, displayed below the logo on each page, and
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              used in RSS documents as the channel title.
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            '';
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          };
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          webHost = mkOption {
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            type = str;
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            description = "Host part of the wiki URL. If undefined, the name of the attribute set will be used.";
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            example = "wiki.example.org";
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          };
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          webLocation = mkOption {
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            type = str;
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            default = "/";
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            example = "/moin";
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            description = "Location part of the wiki URL.";
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          };
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          frontPage = mkOption {
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            type = str;
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            default = "LanguageSetup";
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            example = "FrontPage";
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            description = ''
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              Front page name. Set this to something like <literal>FrontPage</literal> once languages are
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              configured.
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            '';
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          };
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          superUsers = mkOption {
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            type = listOf str;
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            default = [];
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            example = [ "elvis" ];
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            description = ''
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              List of trusted user names with wiki system administration super powers.
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              Please note that accounts for these users need to be created using the <command>moin</command> command-line utility, e.g.:
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              <command>moin-<replaceable>WIKINAME</replaceable> account create --name=<replaceable>NAME</replaceable> --email=<replaceable>EMAIL</replaceable> --password=<replaceable>PASSWORD</replaceable></command>.
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            '';
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          };
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          languageDefault = mkOption {
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            type = str;
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            default = "en";
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            example = "de";
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            description = "The ISO-639-1 name of the main wiki language. Languages that MoinMoin does not support are ignored.";
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          };
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          extraConfig = mkOption {
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            type = lines;
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            default = "";
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            example = ''
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              show_hosts = True
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              search_results_per_page = 100
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              acl_rights_default = u"Known:read,write,delete,revert All:read"
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              logo_string = u"<h2>\U0001f639</h2>"
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              theme_default = u"modernized"
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              user_checkbox_defaults = {'show_page_trail': 0, 'edit_on_doubleclick': 0}
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              navi_bar = [u'SomePage'] + multiconfig.DefaultConfig.navi_bar
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              actions_excluded = multiconfig.DefaultConfig.actions_excluded + ['newaccount']
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              mail_smarthost = "mail.example.org"
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              mail_from = u"Example.Org Wiki <wiki@example.org>"
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            '';
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            description = ''
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              Additional configuration to be appended verbatim to this wiki's config.
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              See <link xlink:href='http://moinmo.in/HelpOnConfiguration' /> for documentation.
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            '';
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          };
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        };
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        config = {
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          webHost = mkDefault name;
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        };
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      }));
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      example = literalExample ''
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        {
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          "mywiki" = {
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            siteName = "Example Wiki";
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            webHost = "wiki.example.org";
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            superUsers = [ "admin" ];
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            frontPage = "Index";
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            extraConfig = "page_category_regex = ur'(?P<all>(Category|Kategorie)(?P<key>(?!Template)\S+))'"
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          };
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        }
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      '';
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      description = ''
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        Configurations of the individual wikis. Attribute names must be valid Python
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        identifiers of the form <literal>[A-Za-z_][A-Za-z0-9_]*</literal>.
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        For every attribute <replaceable>WIKINAME</replaceable>, a helper script
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        moin-<replaceable>WIKINAME</replaceable> is created which runs the
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        <command>moin</command> command under the <literal>moin</literal> user (to avoid
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        file ownership issues) and with the right configuration directory passed to it.
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      '';
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    };
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  };
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  config = mkIf cfg.enable {
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    assertions = forEach (attrNames cfg.wikis) (wname:
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      { assertion = builtins.match "[A-Za-z_][A-Za-z0-9_]*" wname != null;
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        message = "${wname} is not valid Python identifier";
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      }
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    );
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    users.users = {
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      moin = {
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        description = "MoinMoin wiki";
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        home = dataDir;
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        group = group;
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        isSystemUser = true;
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      };
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    };
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    users.groups = {
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      moin = {
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        members = mkIf usingNginx [ config.services.nginx.user ];
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      };
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    };
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    environment.systemPackages = [ pkg ] ++ map moinCliWrapper (attrNames cfg.wikis);
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    systemd.services = mkIf usingGunicorn
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      (flip mapAttrs' cfg.wikis (wikiIdent: wiki:
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        nameValuePair "moin-${wikiIdent}"
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          {
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            description = "MoinMoin wiki ${wikiIdent} - gunicorn process";
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            wantedBy = [ "multi-user.target" ];
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            after = [ "network.target" ];
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            restartIfChanged = true;
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            restartTriggers = [ (wikiConfigFile wikiIdent wiki) ];
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            environment = let
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              penv = python.buildEnv.override {
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                # setuptools: https://github.com/benoitc/gunicorn/issues/1716
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                extraLibs = [ python.pkgs.gevent python.pkgs.setuptools pkg ];
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              };
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            in {
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              PYTHONPATH = "${dataDir}/${wikiIdent}/config:${penv}/${python.sitePackages}";
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            };
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            preStart = ''
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              umask 0007
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              rm -rf ${dataDir}/${wikiIdent}/underlay
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              cp -r ${pkg}/share/moin/underlay ${dataDir}/${wikiIdent}/
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              chmod -R u+w ${dataDir}/${wikiIdent}/underlay
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            '';
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            serviceConfig = {
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              User = user;
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              Group = group;
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              WorkingDirectory = "${dataDir}/${wikiIdent}";
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              ExecStart = ''${python.pkgs.gunicorn}/bin/gunicorn moin_wsgi \
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                --name gunicorn-${wikiIdent} \
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                --workers ${toString cfg.gunicorn.workers} \
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                --worker-class gevent \
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                --bind unix:/run/moin/${wikiIdent}/gunicorn.sock
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              '';
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              Restart = "on-failure";
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              RestartSec = "2s";
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              StartLimitIntervalSec = "30s";
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              StateDirectory = "moin/${wikiIdent}";
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              StateDirectoryMode = "0750";
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              RuntimeDirectory = "moin/${wikiIdent}";
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              RuntimeDirectoryMode = "0750";
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              NoNewPrivileges = true;
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              ProtectSystem = "strict";
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              ProtectHome = true;
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              PrivateTmp = true;
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              PrivateDevices = true;
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              PrivateNetwork = true;
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              ProtectKernelTunables = true;
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              ProtectKernelModules = true;
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              ProtectControlGroups = true;
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              RestrictAddressFamilies = [ "AF_UNIX" "AF_INET" "AF_INET6" ];
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              RestrictNamespaces = true;
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              LockPersonality = true;
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              MemoryDenyWriteExecute = true;
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              RestrictRealtime = true;
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            };
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          }
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      ));
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    services.nginx = mkIf usingNginx {
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      enable = true;
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      virtualHosts = flip mapAttrs' cfg.wikis (name: w: nameValuePair w.webHost {
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        forceSSL = mkDefault true;
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        enableACME = mkDefault true;
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        locations."${w.webLocation}" = {
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          extraConfig = ''
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            proxy_set_header Host $host;
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            proxy_set_header X-Real-IP $remote_addr;
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            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
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            proxy_set_header X-Forwarded-Proto $scheme;
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            proxy_set_header X-Forwarded-Host $host;
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            proxy_set_header X-Forwarded-Server $host;
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            proxy_pass http://unix:/run/moin/${name}/gunicorn.sock;
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          '';
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        };
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      });
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    };
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    systemd.tmpfiles.rules = [
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      "d  /run/moin            0750 ${user} ${group} - -"
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      "d  ${dataDir}           0550 ${user} ${group} - -"
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    ]
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    ++ (concatLists (flip mapAttrsToList cfg.wikis (wikiIdent: wiki: [
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      "d  ${dataDir}/${wikiIdent}                      0750 ${user} ${group} - -"
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      "d  ${dataDir}/${wikiIdent}/config               0550 ${user} ${group} - -"
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      "L+ ${dataDir}/${wikiIdent}/config/wikiconfig.py -    -       -        - ${wikiConfigFile wikiIdent wiki}"
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      # needed in order to pass module name to gunicorn
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      "L+ ${dataDir}/${wikiIdent}/config/moin_wsgi.py  -    -       -        - ${pkg}/share/moin/server/moin.wsgi"
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      # seed data files
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      "C  ${dataDir}/${wikiIdent}/data                 0770 ${user} ${group} - ${pkg}/share/moin/data"
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      # fix nix store permissions
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      "Z  ${dataDir}/${wikiIdent}/data                 0770 ${user} ${group} - -"
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    ])));
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  };
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  meta.maintainers = with lib.maintainers; [ b42 ];
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}
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