dev/default.nix

@@ -1,10 +1,14 @@
+{ pkgs, lib, config, ... }:
+let
+    settings = import ./../settings.nix;
+in
 {
     imports = [
         ./language-server.nix
-        ./dotnet.nix
-        ./docker-rootless.nix
-        ./platformio.nix
-        ./qemu.nix
-        ./latex.nix
-    ];
+    ]
+    ++ lib.optionals settings.virtualisation.docker-rootless.enable [ ./docker-rootless.nix ]
+    ++ lib.optionals settings.virtualisation.qemu.enable [ ./qemu.nix ]
+    ++ lib.optionals settings.dev.platformio [ ./platformio.nix ]
+    ++ lib.optionals settings.dev.latex [ ./latex.nix ]
+    ++ lib.optionals settings.dev.dotnet [ ./dotnet.nix ];
 }

dev/docker-rootless.nix

@@ -1,9 +1,13 @@
-{ pkgs, config, ... }: {
+{ pkgs, config, ... }:
+let
+    settings = import ./../settings.nix;
+in
+{
     # enable rootless docker for more security
     virtualisation.docker.rootless = {
         enable = true;
         setSocketVariable = true;
     };
     # regulary clean unused docker images
-    virtualisation.docker.autoPrune.enable = true;
+    virtualisation.docker.autoPrune.enable = settings.virtualisation.docker-rootless.autoPrune;
 }

dev/qemu.nix

@@ -1,10 +1,14 @@
-{ pkgs, config, ... }: {
+{ pkgs, config, ... }:
+let
+    settings = import ./../settings.nix;
+in
+{
     # KVM
     virtualisation.libvirtd.enable = true;
-    # programs.virt-manager.enable = true;  # after 23.11
+    programs.virt-manager.enable = settings.virtualisation.qemu.virt-manager;  # after 23.11
 
     # only before 23.11
-    environment.systemPackages = (with pkgs; [
-        virt-manager
-    ]);
+    # environment.systemPackages = (with pkgs; [
+    #    virt-manager
+    # ]);
 }

settings.nix

@@ -14,6 +14,22 @@ with import <nixpkgs> {}; {
         };
     };
 
+    virtualisation = {
+        docker-rootless = {
+            enable = true;
+            autoPrune = true;
+        };
+        qemu = {
+            enable = true;
+            virt-manager = true;
+        };
+    };
+    dev = {
+        platformio = true;
+        latex = true;
+        dotnet = false;
+    };
+
     dvd = true;     # enable DVD decryption + ripping via Handbrake
     bluray = true;  # enable Bluray decryption (requires additional setup)
     printing = {