Add config for declaring hardware

lib/modules/hardware.nix

@@ -0,0 +1,43 @@
+{ lib, ... }:
+  let
+    inherit (lib)
+      mkOption
+      types
+    ;
+  in {
+    options = {
+      valhalla = {
+        hardware = {
+          components = mkOption {
+            type = types.listOf types.str;
+            description = "The names of the hardware components of the computer.";
+            default = [];
+          };
+
+          eyeX = mkOption {
+            type = types.bool;
+            description = "A value indicating whether a Tobii EyeX device is present.";
+            default = false;
+          };
+
+          amdCPU = mkOption {
+            type = types.bool;
+            description = "A value indicating whether an AMD CPU is present.";
+            default = false;
+          };
+
+          nvidiaGPU = mkOption {
+            type = types.bool;
+            description = "A value indicating whether an NVIDIA GPU is present.";
+            default = false;
+          };
+
+          elgatoWave = mkOption {
+            type = types.bool;
+            description = "A value indicating whether an Elgato Wave device is present.";
+            default = false;
+          };
+        };
+      };
+    };
+  }

lib/modules/valhalla.nix

@@ -7,6 +7,7 @@
   in {
     imports = [
       ./git.nix
+      ./hardware.nix
       ./i18n.nix
       ./partition.nix
       ./software.nix

profiles/DerGeret/config.nix

@@ -25,6 +25,17 @@
           keepExisting = true;
         };
       };
+
+      hardware = {
+        components = [
+          "ROG Zenith Extreme Alpha"
+        ];
+
+        eyeX = true;
+        amdCPU = true;
+        nvidiaGPU = true;
+        elgatoWave = true;
+      };
     };
   };
 }