nixos/godns: init module

Initial implementation of the GoDNS service module. This module allows users to enable and configure the GoDNS service on their NixOS system. It includes options for specifying the GoDNS package and the path to the configuration file.

nixos/doc/manual/release-notes/rl-2411.section.md

@@ -207,6 +207,8 @@
 
 - [Glances](https://github.com/nicolargo/glances), an open-source system cross-platform monitoring tool. Available as [services.glances](option.html#opt-services.glances).
 
+- [GoDNS](https://github.com/TimothyYe/godns), a dynamic DNS client written in Go, which supports multiple DNS providers. Available as [services.godns](#opt-services.godns.enable).
+
 ## Backward Incompatibilities {#sec-release-24.11-incompatibilities}
 
 - Nixpkgs now requires Nix 2.3.17 or newer to allow for zstd compressed binary artifacts.

nixos/modules/module-list.nix

@@ -1064,6 +1064,7 @@
   ./services/networking/go-neb.nix
   ./services/networking/go-shadowsocks2.nix
   ./services/networking/gobgpd.nix
+  ./services/networking/godns.nix
   ./services/networking/gvpe.nix
   ./services/networking/hans.nix
   ./services/networking/harmonia.nix

nixos/modules/services/networking/godns.nix

@@ -0,0 +1,87 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+let
+  inherit (lib)
+    mkEnableOption
+    mkIf
+    mkOption
+    mkPackageOption
+    types
+    ;
+
+  cfg = config.services.godns;
+
+  configFormat = pkgs.formats.yaml { };
+  configFile =
+    if cfg.configFile == null then configFormat.generate "config.yaml" cfg.config else cfg.configFile;
+in
+{
+
+  options.services.godns = {
+    enable = mkEnableOption "GoDNS service";
+
+    package = mkPackageOption pkgs "godns" { };
+
+    config = mkOption {
+      type = lib.types.submodule {
+        freeformType = configFormat.type;
+      };
+
+      default = { };
+
+      description = ''
+        Configuration for GoDNS. Refer to the [configuration section](1) in the
+        GoDNS GitHub repository for details.
+
+        [1]: https://github.com/TimothyYe/godns?tab=readme-ov-file#configuration
+      '';
+    };
+
+    configFile = lib.mkOption {
+      default = null;
+      description = ''
+        Path to a custom GoDNS configuration file.
+
+        If set, this option overrides the configuration provided by the `config`
+        option. This is particularly useful for specifying sensitive values like
+        the `login_token` for API providers. For generating a configuration file
+        with secrets, consider using [sops-nix templates][1].
+
+        [1]: https://github.com/Mic92/sops-nix?tab=readme-ov-file#templates
+      '';
+      type = types.nullOr types.path;
+    };
+
+    additionalRestartTriggers = mkOption {
+      default = [ ];
+      type = types.listOf types.unspecified;
+      description = ''
+        Additional triggers to restart the GoDNS service.
+
+        This can be used to restart the service when, for example, a secret used
+        to generate the configuration changes.
+      '';
+    };
+  };
+
+  config = mkIf cfg.enable {
+    systemd.services.godns = {
+      description = "GoDNS service";
+      wantedBy = [ "multi-user.target" ];
+      after = [ "network.target" ];
+      serviceConfig = {
+        ExecStart = "${lib.getExe cfg.package} -c ${configFile}";
+        Restart = "always";
+        KillMode = "process";
+        RestartSec = "2s";
+      };
+      restartTriggers = [ ] ++ cfg.additionalRestartTriggers;
+    };
+  };
+
+  meta.maintainers = [ lib.maintainers.michaelvanstraten ];
+}