refactor: explicitly allow unfree packages

modules2/unfree-packages.nix

@@ -0,0 +1,26 @@
+{ config, lib, ... }:
+
+{
+  options.nixpkgs.allowedUnfreePackages = lib.mkOption {
+    type = lib.types.listOf lib.types.str;
+    default = [ ];
+  };
+
+  config.flake = {
+    modules =
+      let
+        predicate = pkg: builtins.elem (lib.getName pkg) config.nixpkgs.allowedUnfreePackages;
+      in
+      {
+        nixos.pc.nixpkgs.config.allowUnfreePredicate = predicate;
+
+        homeManager.base = args: {
+          nixpkgs.config = lib.mkIf (!(args.hasGlobalPkgs or false)) {
+            allowUnfreePredicate = predicate;
+          };
+        };
+      };
+
+    meta.nixpkgs.allowedUnfreePackages = config.nixpkgs.allowedUnfreePackages;
+  };
+}