nix stuff

global/system.nix

@@ -1,5 +1,6 @@
 # https://search.nixos.org/options
 user: {
+  inputs,
   config,
   pkgs,
   lib,
@@ -9,16 +10,19 @@ user: {
     ./home.nix
   ];
 
-  nix.settings = {
-    experimental-features = ["nix-command" "flakes"];
+  nix = {
+    settings = {
+      experimental-features = ["nix-command" "flakes"];
+    };
+    settings.trusted-users = ["root" user];
+
+    registry.nixpkgs.flake = inputs.nixpkgs;
   };
 
   nixpkgs.config.permittedInsecurePackages = [
     "electron-25.9.0"
   ];
 
-  nix.settings.trusted-users = ["root" user];
-
   boot.loader.systemd-boot.enable = true;
   boot.loader.efi.canTouchEfiVariables = true;
 
@@ -94,15 +98,12 @@ user: {
   services.xserver = {
     layout = lib.mkDefault "gb";
     xkbOptions = "caps:escape";
-    #    extraLayouts = {
-    #      mine = {
-    #        description = "my layout";
-    #        languages = [ "eng" ];
-    #        symbolsFile = ./xkblayout;
-    #      };
-    #    };
   };
 
+  system.configurationRevision =
+    pkgs.lib.mkIf (inputs.self ? rev)
+    inputs.self.rev;
+
   hardware.opentabletdriver.enable = true;
 
   qt.enable = true;