now it's a function, requiring userdata argument

configuration.nix

@@ -1,4 +1,4 @@
-{ selfprivacy-overlay, config, pkgs, lib, ... }:
+{ userdata, selfprivacy-overlay, config, pkgs, lib, ... }:
 {
   imports = [
     ./hardware-configuration.nix

flake.nix

@@ -12,12 +12,9 @@
   outputs = { self, nixpkgs, selfprivacy-overlay }:
     let
       system = "x86_64-linux";
-
-      # pkgs = import nixpkgs { inherit system; };
-      userdata = builtins.fromJSON (builtins.readFile ./userdata/userdata.json);
     in
     {
-      nixosConfigurations = {
+      nixosConfigurations-fun = userdata: {
         just-nixos = nixpkgs.lib.nixosSystem {
           specialArgs = { inherit system selfprivacy-overlay userdata; };
 

variables.nix

@@ -1,6 +1,6 @@
-{ pkgs, lib, ... }:
+{ lib, userdata, ... }:
 let
-  jsonData = builtins.fromJSON (builtins.readFile ./userdata/userdata.json);
+  jsonData = userdata;
 in
 {
   services.userdata = {