refactor(nixos): move nvidia config to its own module

modules/nixos/hardware/default.nix

@@ -8,12 +8,10 @@ let
 in
 {
   imports = [
-    ./nvidia.nix
     ./audio.nix
   ];
 
   options.hardware = {
-    gpu = lib.pantheon.mkStrOption;
     platform = lib.pantheon.mkStrOption;
   };
 

modules/nixos/hardware/gpu/default.nix

@@ -0,0 +1,41 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+let
+  inherit (lib)
+    mkMerge
+    mkIf
+    mkEnableOption
+    singleton
+    ;
+  cfg = config.hardware.gpu;
+in
+{
+  options.hardware.gpu = {
+    nvidia.enable = mkEnableOption "";
+  };
+  config = mkMerge [
+    (mkIf cfg.nvidia.enable {
+      hardware = {
+        graphics.enable = true;
+        graphics.extraPackages = singleton pkgs.nvidia-vaapi-driver;
+        nvidia.open = true;
+        nvidia.package = config.boot.kernelPackages.nvidiaPackages.latest;
+      };
+      services.xserver.videoDrivers = [ "nvidia" ];
+      nixpkgs.config.allowUnfree = true;
+      environment.variables = {
+        LIBVA_DRIVER_NAME = "nvidia";
+        __GLX_VENDOR_LIBRARY_NAME = "nvidia";
+        NVD_BACKEND = "direct";
+      };
+      nix.settings.substituters = [ "https://cuda-maintainers.cachix.org" ];
+      nix.settings.trusted-public-keys = [
+        "cuda-maintainers.cachix.org-1:0dq3bujKpuEPMCX6U4WylrUDZ9JyUG0VpVZa7CNfq5E="
+      ];
+    })
+  ];
+}

modules/nixos/hardware/nvidia.nix

@@ -1,29 +0,0 @@
-{
-  lib,
-  config,
-  pkgs,
-  ...
-}:
-{
-  config = lib.mkIf (config.hardware.gpu == "nvidia") {
-    hardware = {
-      graphics.enable = true;
-      graphics.extraPackages = with pkgs; [
-        nvidia-vaapi-driver
-      ];
-      nvidia.open = true;
-      nvidia.package = config.boot.kernelPackages.nvidiaPackages.latest;
-    };
-    services.xserver.videoDrivers = [ "nvidia" ];
-    nixpkgs.config.allowUnfree = true;
-    environment.variables = {
-      LIBVA_DRIVER_NAME = "nvidia";
-      __GLX_VENDOR_LIBRARY_NAME = "nvidia";
-      NVD_BACKEND = "direct";
-    };
-    nix.settings.substituters = [ "https://cuda-maintainers.cachix.org" ];
-    nix.settings.trusted-public-keys = [
-      "cuda-maintainers.cachix.org-1:0dq3bujKpuEPMCX6U4WylrUDZ9JyUG0VpVZa7CNfq5E="
-    ];
-  };
-}

modules/nixos/server/web-apps/sd-webui-forge/default.nix

@@ -15,7 +15,7 @@ mkWebApp {
   };
   extraConfig = {
     assertions = singleton {
-      assertion = config.hardware.gpu == "nvidia";
+      assertion = config.hardware.gpu.nvidia.enable;
       message = "You must run the sd-webui-forge service only with an nvidia gpu.";
     };
     services.sd-webui-forge = {