BuildClan: autoimport facter.json

lib/build-clan/module.nix

@@ -64,14 +64,30 @@ let
       modules =
         let
           settings = machineSettings name;
+          facterJson = "${directory}/machines/${name}/facter.json";
+          hwConfig = "${directory}/machines/${name}/hardware-configuration.nix";
+
+          facterModules = lib.optionals (builtins.pathExists facterJson) [
+            clan-core.inputs.nixos-facter-modules.nixosModules.facter
+            { config.facter.reportPath = facterJson; }
+          ];
         in
         (machineImports settings)
+        ++ facterModules
         ++ [
           {
             # Autoinclude configuration.nix and hardware-configuration.nix
             imports = builtins.filter builtins.pathExists [
               "${directory}/machines/${name}/configuration.nix"
-              "${directory}/machines/${name}/hardware-configuration.nix"
+              hwConfig
+            ];
+            config.warnings = lib.optionals (builtins.all builtins.pathExists [hwConfig facterJson]) [
+              ''
+                Duplicate hardware facts: '${hwConfig}' and '${facterJson}' exist.
+                Using both is not recommended.
+
+                It is recommended to use the hardware facts from '${facterJson}', please remove '${hwConfig}'.
+              ''
             ];
           }
           settings