modules/system/settei: add unfree module

hosts/kogata/default.nix

@@ -6,8 +6,7 @@
 
       settei.user.config.common.desktop.enable = true;
 
-      # TODO: Make it a settei module so it's easy to concatenate which pkgs are allowed
-      nixpkgs.config.allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg) [ "teams" ];
+      settei.unfree.allowedPackages = [ "teams" ];
       environment.systemPackages = with pkgs; [ teams ];
 
       settei.tailscale = {

modules/system/common/default.nix

@@ -38,7 +38,7 @@ let
     # so I need to override the fish package.
     nixpkgs.overlays = [ (_: _: { inherit (inputs'.settei.packages) fish; }) ];
     # TODO: Move to home/common/desktop
-    nixpkgs.config.allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg) [ "signal-desktop" ];
+    settei.unfree.allowedPackages = [ "signal-desktop" ];
 
     nix.settings.allow-import-from-derivation = false;
   };

modules/system/settei/default.nix

@@ -20,6 +20,7 @@
     (import ./programs { inherit isLinux; })
     (import ./tailscale.nix { inherit isLinux; })
     (import ./containers.nix { inherit isLinux; })
+    ./unfree.nix
   ];
 
   options.settei = with lib; {

modules/system/settei/unfree.nix

@@ -0,0 +1,19 @@
+{ config, lib, ... }:
+{
+  _file = ./unfree.nix;
+
+  options = {
+    # TODO(maybe?): Allow other types and more customizability
+    settei.unfree.allowedPackages =
+      with lib;
+      mkOption {
+        type = types.listOf types.str;
+      };
+  };
+
+  config = {
+    nixpkgs.config.allowUnfreePredicate = lib.mkForce (
+      pkg: builtins.elem (lib.getName pkg) config.settei.unfree.allowedPackages
+    );
+  };
+}