refactor: extract more things from flake.nix

flake.nix

@@ -3,33 +3,36 @@
   inputs = {
     nixpkgs.url = "nixpkgs/nixpkgs-unstable";
   };
-  outputs = { self, nixpkgs, ... }:
+  outputs =
+    { self, nixpkgs, ... }:
     let
       # DayZ only runs on x86_64 systems
       system = "x86_64-linux";
-      pkgs = import nixpkgs {
+      pkgs = import nixpkgs { inherit system; };
-        inherit system;
-        overlays = [ self.overlays.default ];
-      };
     in
-    with pkgs; {
+    {
       packages.${system} = rec {
         default = dzgui;
-        inherit (pkgs) dzgui;
+        dzgui = pkgs.callPackage ./package { };
       };
 
       overlays = {
-        default = (final: _: {
+        default = import ./overlay.nix;
-          dzgui = (final.callPackage ./package { });
-        });
       };
 
       nixosModules = rec {
         default = dzgui;
-        dzgui = import ./module.nix { inherit self; };
+        dzgui = import ./module.nix;
       };
 
-      devShells.${system}.default =
+      devShells.${system}.default = pkgs.mkShell {
-        mkShell { buildInputs = self.packages.${system}.default.runtimeDeps; };
+        buildInputs = self.packages.${system}.default.runtimeDeps;
+      };
+
+      checks.${system}.nixosCheck =
+        (nixpkgs.lib.nixosSystem {
+          inherit system;
+          modules = [ ./nixos-test/configuration.nix ];
+        }).config.system.build.toplevel;
     };
 }

module.nix

@@ -1,25 +1,29 @@
-{ self, ... }:
+{
-{ pkgs, config, lib, ... }:
+  pkgs,
-with lib;
+  config,
+  lib,
+  ...
+}:
 let
   cfg = config.programs.dzgui;
 in
 {
   options.programs.dzgui = {
-    enable = mkEnableOption (mdDoc ''
+    enable = lib.mkEnableOption (
+      lib.mdDoc ''
         Weather to install dzgui and setup workarounds for DayZ to work on linux
-    '');
+      ''
-    package = mkOption {
+    );
-      type = with types; nullOr package;
+    package = lib.mkOption {
-      default = pkgs.dzgui;
+      type = with lib.types; nullOr package;
-      defaultText = literalExpression "pkgs.dzgui";
+      default = pkgs.callPackage ./package { };
-      description = mdDoc "Dzgui package to use.";
+      defaultText = lib.literalExpression "pkgs.dzgui";
+      description = lib.mdDoc "Dzgui package to use.";
     };
   };
-  config = mkIf cfg.enable {
+  config = lib.mkIf cfg.enable {
     # Needed by DayZ
     boot.kernel.sysctl."vm.max_map_count" = 1048576;
-    nixpkgs.overlays = [ self.overlays.default ];
     environment.systemPackages = [ cfg.package ];
   };
 }

nixos-test/configuration.nix

@@ -0,0 +1,7 @@
+{
+  imports = [ ../module.nix ];
+  programs.dzgui.enable = true;
+
+  boot.isContainer = true;
+  system.stateVersion = "24.05";
+}

overlay.nix

@@ -0,0 +1 @@
+(final: _: { dzgui = (final.callPackage ./package { }); })

package/default.nix

@@ -1,15 +1,16 @@
-{ lib
+{
-, stdenv
+  lib,
-, fetchFromGitHub
+  stdenv,
-, makeWrapper
+  fetchFromGitHub,
-, curl
+  makeWrapper,
-, jq
+  curl,
-, python3
+  jq,
-, wmctrl
+  python3,
-, xdotool
+  wmctrl,
-, gnome
+  xdotool,
-, gobject-introspection
+  gnome,
-, wrapGAppsHook
+  gobject-introspection,
+  wrapGAppsHook,
 }:
 stdenv.mkDerivation rec {
   pname = "dzgui";
@@ -38,9 +39,7 @@ stdenv.mkDerivation rec {
   runtimeDeps = [
     curl
     jq
-    (python3.withPackages (p: with p; [
+    (python3.withPackages (p: with p; [ pygobject3 ]))
-      pygobject3
-    ]))
 
     wmctrl
     xdotool