nixos/nixbit: init module

Signed-off-by: Patrizio Bekerle <patrizio@bekerle.com>

nixos/doc/manual/release-notes/rl-2511.section.md

@@ -168,6 +168,8 @@
 
 - [Tenstorrent](https://tenstorrent.com) hardware module has been added.
 
+- [nixbit](https://github.com/pbek/nixbit), a GUI application for updating your NixOS system from a Nix Flakes Git repository. Available as [programs.nixbit](#opt-programs.nixbit.enable).
+
 ## Backward Incompatibilities {#sec-release-25.11-incompatibilities}
 
 <!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. -->

nixos/modules/module-list.nix

@@ -277,6 +277,7 @@
   ./programs/nix-index.nix
   ./programs/nix-ld.nix
   ./programs/nix-required-mounts.nix
+  ./programs/nixbit.nix
   ./programs/nm-applet.nix
   ./programs/nncp.nix
   ./programs/noisetorch.nix

nixos/modules/programs/nixbit.nix

@@ -0,0 +1,49 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+let
+  inherit (lib)
+    mkEnableOption
+    mkIf
+    mkOption
+    mkPackageOption
+    types
+    ;
+  cfg = config.programs.nixbit;
+in
+{
+  options.programs.nixbit = {
+    enable = mkEnableOption "Nixbit configuration";
+
+    package = mkPackageOption pkgs "nixbit" { };
+
+    repository = mkOption {
+      type = types.str;
+      description = "Git repository URL for Nixbit";
+    };
+
+    forceAutostart = mkEnableOption "" // {
+      description = "Force creation of autostart desktop entry when application starts";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    environment = {
+      systemPackages = [ cfg.package ];
+
+      etc."nixbit.conf".text =
+        lib.optionalString (cfg.repository != "") ''
+          [Repository]
+          Url = ${cfg.repository}
+        ''
+        + ''
+          [Autostart]
+          Force = ${if cfg.forceAutostart then "true" else "false"}
+        '';
+    };
+  };
+}