Merge pull request #206099 from sweenu/add-goeland-module

nixos/goeland: init

nixos/modules/module-list.nix

@@ -530,6 +530,7 @@
   ./services/mail/dovecot.nix
   ./services/mail/dspam.nix
   ./services/mail/exim.nix
+  ./services/mail/goeland.nix
   ./services/mail/listmonk.nix
   ./services/mail/maddy.nix
   ./services/mail/mail.nix

nixos/modules/services/mail/goeland.nix

@@ -0,0 +1,74 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.goeland;
+  tomlFormat = pkgs.formats.toml { };
+in
+{
+  options.services.goeland = {
+    enable = mkEnableOption (mdDoc "goeland");
+
+    settings = mkOption {
+      description = mdDoc ''
+        Configuration of goeland.
+        See the [example config file](https://github.com/slurdge/goeland/blob/master/cmd/asset/config.default.toml) for the available options.
+      '';
+      default = { };
+      type = tomlFormat.type;
+    };
+    schedule = mkOption {
+      type = types.str;
+      default = "12h";
+      example = "Mon, 00:00:00";
+      description = mdDoc "How often to run goeland, in systemd time format.";
+    };
+    stateDir = mkOption {
+      type = types.path;
+      default = "/var/lib/goeland";
+      description = mdDoc ''
+        The data directory for goeland where the database will reside if using the unseen filter.
+        If left as the default value this directory will automatically be created before the goeland
+        server starts, otherwise you are responsible for ensuring the directory exists with
+        appropriate ownership and permissions.
+      '';
+    };
+  };
+
+  config = mkIf cfg.enable {
+    services.goeland.settings.database = "${cfg.stateDir}/goeland.db";
+
+    systemd.services.goeland = {
+      serviceConfig = let confFile = tomlFormat.generate "config.toml" cfg.settings; in mkMerge [
+        {
+          ExecStart = "${pkgs.goeland}/bin/goeland run -c ${confFile}";
+          User = "goeland";
+          Group = "goeland";
+        }
+        (mkIf (cfg.stateDir == "/var/lib/goeland") {
+          StateDirectory = "goeland";
+          StateDirectoryMode = "0750";
+        })
+      ];
+      startAt = cfg.schedule;
+    };
+
+    users.users.goeland = {
+      description = "goeland user";
+      group = "goeland";
+      isSystemUser = true;
+    };
+    users.groups.goeland = { };
+
+    warnings = optionals (hasAttr "password" cfg.settings.email) [
+      ''
+        It is not recommended to set the "services.goeland.settings.email.password"
+        option as it will be in cleartext in the Nix store.
+        Please use "services.goeland.settings.email.password_file" instead.
+      ''
+    ];
+  };
+
+  meta.maintainers = with maintainers; [ sweenu ];
+}