configurations/home-manager/eve/default.nix

@@ -1,9 +1,9 @@
 {osConfig, ...}: let
   userConfig = osConfig.host.users.eve;
 in {
-  nixpkgs.config = {
+  imports = [
-    allowUnfree = true;
+    ./packages.nix
-  };
+  ];
 
   home = {
     username = userConfig.name;

configurations/home-manager/eve/packages.nix

@@ -6,13 +6,19 @@
   ...
 }: let
   userConfig = osConfig.host.users.eve;
+  hardware = osConfig.host.hardware;
 in {
   config = {
+    nixpkgs.config = {
+      allowUnfree = true;
+    };
+
     # Packages that can be installed without any extra configuration
     # See https://search.nixos.org/packages for all options
     home.packages = lib.lists.optionals userConfig.isDesktopUser (
       with pkgs; [
         ungoogled-chromium
+        (lib.mkIf hardware.piperMouse.enable piper)
       ]
     );
 

configurations/nixos/emergent/configuration.nix

@@ -49,6 +49,9 @@
         isPrincipleUser = true;
       };
     };
+    hardware = {
+      piperMouse.enable = true;
+    };
 
     storage = {
       enable = true;