use hardware-configuration.nix as a flake input

.gitignore

@@ -1,4 +1,4 @@
 userdata/userdata.json
 userdata/tokens.json
-hardware-configuration.nix
-networking.nix
+networking.nix
+/result

configuration.nix

@@ -1,7 +1,6 @@
 { userdata, selfprivacy-overlay, config, pkgs, lib, ... }:
 {
   imports = [
-    ./hardware-configuration.nix
     ./variables-module.nix
     ./variables.nix
     ./files.nix

flake.nix

@@ -2,25 +2,34 @@
   description = "Selfprivacy NixOS configuration flake";
 
   inputs = {
-    #nixpkgs.url = "https://github.com/NixOS/nixpkgs/archive/eef86b8a942913a828b9ef13722835f359deef29.tar.gz";
     nixpkgs.url = "github:nixos/nixpkgs";
+
     selfprivacy-overlay.url =
       "git+https://git.selfprivacy.org/SelfPrivacy/selfprivacy-nix-repo.git";
-    userdata-json.url = "path:./userdata.json";
-    userdata-json.flake = false;
+
+    # these inputs are expected to be set by the caller
+    # for example, upon nix build using --override-input
+    userdata-json.flake = false; # userdata.json
+    hardware-configuration-nix.flake = false; # hardware-configuration.nix
   };
 
-  outputs = { self, nixpkgs, selfprivacy-overlay, userdata-json }:
+  outputs =
+    { self
+    , nixpkgs
+    , selfprivacy-overlay
+    , userdata-json
+    , hardware-configuration-nix
+    }:
     let
       system = "x86_64-linux";
       userdata = builtins.fromJSON (builtins.readFile userdata-json);
+      hardware-configuration = import hardware-configuration-nix;
     in
     {
       nixosConfigurations = {
         just-nixos = nixpkgs.lib.nixosSystem {
           specialArgs = { inherit system selfprivacy-overlay userdata; };
-
-          modules = [ ./configuration.nix ];
+          modules = [ hardware-configuration ./configuration.nix ];
         };
       };
     };

hardware-configuration.nix

@@ -1,7 +0,0 @@
-{ modulesPath, ... }:
-{
-  imports = [ (modulesPath + "/profiles/qemu-guest.nix") ];
-  boot.loader.grub.device = "/dev/sda";
-  boot.initrd.kernelModules = [ "nvme" ];
-  fileSystems."/" = { device = "/dev/sda1"; fsType = "ext4"; };
-}