convoluted solution looking for a problem

unified modules structure

.gitignore

@@ -1 +1,2 @@
 .directory
+result

hetzner-vpn1.nix

@@ -1,13 +1,13 @@
-{...}: {
+{pkgs, ...}: {
   imports = [
-    ./modules/server
-    (import ./modules/hardware "hetzner-vpn1")
+    (import ./modules {
+      hostName = "hetzner-vpn1";
+      enableDesktop = false;
+    })
   ];
 
   config = {
-    my = {
-      server.enable = true;
-    };
+    my.server.enable = true;
 
     users.users.root.openssh.authorizedKeys.keys = [
       ''ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICdYqY3Y1/f1bsAi5Qfyr/UWuX9ixu96IeAlhoQaJkbf''

modules/_common/default.nix

@@ -1,6 +0,0 @@
-{...}: {
-  imports = [
-    ./i18n.nix
-    ./nixpkgs.nix
-  ];
-}

modules/default.nix

@@ -0,0 +1,16 @@
+modulesCfg: {lib, ...}: {
+  imports =
+    [
+      ./i18n.nix
+      ./nixpkgs.nix
+      ./server.nix
+    ]
+    ++ (map (path: (import path modulesCfg)) [
+      ./desktop
+      ./hardware
+    ]);
+
+  config = {
+    my.modulesCfg = modulesCfg;
+  };
+}

modules/desktop/default.nix

@@ -1,14 +1,14 @@
-{
+modulesCfg: {
   config,
   pkgs,
   lib,
   ...
 }: let
+  isEnabled = modulesCfg.enableDesktop;
   cfg = config.my.desktop;
 in {
-  imports = [
+  imports = lib.optionals isEnabled [
     <home-manager/nixos>
-    ../_common
     ./gnome.nix
     ./kde.nix
     ./vinzenz.nix
@@ -16,6 +16,8 @@ in {
     ./gaming.nix
   ];
 
+  options.my.modulesCfg.enableDesktop = lib.mkEnableOption "enable desktop module";
+
   options.my.desktop = {
     enable = lib.mkEnableOption "desktop";
     gnome.enable = lib.mkEnableOption "gnome desktop";

modules/hardware/common-desktop.nix

@@ -1,9 +1,14 @@
 {
   lib,
   pkgs,
+  config,
   ...
-}: {
-  config = {
+}: let
+  isEnabled = config.my.hardware.enableCommonDesktopSettings;
+in {
+  options.my.hardware.enableCommonDesktopSettings = lib.mkEnableOption "common hw settings for desktops";
+
+  config = lib.mkIf isEnabled {
     boot = {
       kernelPackages = pkgs.linuxPackages_zen;
       kernelParams = ["quiet" "udev.log_level=3"];

modules/hardware/default.nix

@@ -1,13 +1,20 @@
-hostName: {
+modulesCfg: {
   modulesPath,
   lib,
   ...
-}: {
+}: let
+  hostName = modulesCfg.hostName;
+in {
   imports = [
     (modulesPath + "/installer/scan/not-detected.nix")
     (builtins.toString ./. + "/${hostName}.nix")
+    ./common-desktop.nix
   ];
 
+  options.my.modulesCfg.hostName = lib.mkOption {
+    type = lib.types.str;
+  };
+
   config = {
     networking.hostName = hostName;
 

modules/hardware/vinzenz-lpt.nix

@@ -1,9 +1,7 @@
 {...}: {
-  imports = [
-    ./common-desktop.nix
-  ];
-
   config = {
+    my.hardware.enableCommonDesktopSettings = true;
+
     boot = {
       initrd.availableKernelModules = ["xhci_pci" "ehci_pci" "ahci" "usbhid" "usb_storage" "sd_mod" "sdhci_pci"];
       initrd.kernelModules = [];

modules/hardware/vinzenz-pc2.nix

@@ -1,9 +1,7 @@
 {...}: {
-  imports = [
-    ./common-desktop.nix
-  ];
-
   config = {
+    my.hardware.enableCommonDesktopSettings = true;
+
     boot = {
       initrd.availableKernelModules = ["nvme" "xhci_pci" "ahci" "usbhid" "sd_mod"]; # "usb_storage"
       initrd.kernelModules = [];

modules/server.nix

@@ -6,10 +6,6 @@
 }: let
   cfg = config.my.server;
 in {
-  imports = [
-    ../_common
-  ];
-
   options.my.server = {
     enable = lib.mkEnableOption "server role";
   };

vinzenz-lpt.nix

@@ -1,18 +1,17 @@
 {...}: {
   imports = [
-    ./modules/desktop
-    (import ./modules/hardware "vinzenz-lpt")
+    (import ./modules {
+      hostName = "vinzenz-lpt";
+      enableDesktop = true;
+    })
   ];
 
   config = {
-    my = {
-      desktop = {
-        enable = true;
+    my.desktop = {
       gnome.enable = true;
       vinzenz.enable = true;
       gaming.enable = true;
     };
-    };
 
     # flatpak xdg-portal-kde crashes, otherwise this would be global
     services.flatpak.enable = true;

vinzenz-pc2.nix

@@ -1,12 +1,13 @@
 {pkgs, ...}: {
   imports = [
-    ./modules/desktop
-    (import ./modules/hardware "vinzenz-pc2")
+    (import ./modules {
+      hostName = "vinzenz-pc2";
+      enableDesktop = true;
+    })
   ];
 
   config = {
     my.desktop = {
-      enable = true;
       kde.enable = true;
       vinzenz.enable = true;
       ronja.enable = true;