nix vm: more reusability

flake.nix

@@ -60,42 +60,18 @@
           formatter.${system} = pkgs-stable.alejandra;
 
           apps.${system} = let
-            makeVM = (
-              path: system: uid: gid:
-                nixpkgs-stable.lib.nixosSystem {
-                  system = builtins.replaceStrings ["darwin"] ["linux"] system;
-                  modules = [
-                    {
-                      virtualisation.vmVariant = {
-                        virtualisation.host.pkgs = pkgs-stable;
-                      };
-
-                      nixpkgs.overlays = [
-                        self.overlays.debug
-                      ];
-
-                      users.groups.ghostty = {
-                        gid = gid;
-                      };
-
-                      users.users.ghostty = {
-                        uid = gid;
-                      };
-
-                      system.stateVersion = "24.11";
-                    }
-                    ./nix/vm/common.nix
-                    path
-                  ];
-                }
-            );
             runVM = (
               path: let
+                vm = import ./nix/vm/create.nix {
+                  inherit system path;
+                  nixpkgs = nixpkgs-stable;
+                  overlay = self.overlays.debug;
+                };
                 program = pkgs-stable.writeShellScript "run-ghostty-vm" ''
                   SHARED_DIR=$(pwd)
                   export SHARED_DIR
 
-                  ${(makeVM path system 1000 1000).config.system.build.vm}/bin/run-ghostty-vm
+                  ${vm.config.system.build.vm}/bin/run-ghostty-vm
                 '';
               in {
                 type = "app";
@@ -124,6 +100,10 @@
           ghostty = self.packages.${prev.system}.ghostty-debug;
         };
       };
+      create-vm = import ./nix/vm/create.nix;
+      create-cinnamon-vm = import ./nix/vm/create-cinnamon.nix;
+      create-gnome-vm = import ./nix/vm/create-gnome.nix;
+      create-plasma6-vm = import ./nix/vm/create-plasma6.nix;
     };
 
   nixConfig = {

nix/vm/common-cinnamon.nix

@@ -1,4 +1,8 @@
 {...}: {
+  imports = [
+    ./common.nix
+  ];
+
   services.xserver = {
     displayManager = {
       lightdm = {

nix/vm/common-gnome.nix

@@ -4,6 +4,10 @@
   pkgs,
   ...
 }: {
+  imports = [
+    ./common.nix
+  ];
+
   services.xserver = {
     displayManager = {
       gdm = {

nix/vm/common-plasma6.nix

@@ -1,4 +1,8 @@
 {...}: {
+  imports = [
+    ./common.nix
+  ];
+
   services = {
     displayManager = {
       sddm = {

nix/vm/create-cinnamon.nix

@@ -0,0 +1,12 @@
+{
+  system,
+  nixpkgs,
+  overlay,
+  path,
+  uid ? 1000,
+  gid ? 1000,
+}:
+import ./create.nix {
+  inherit system nixpkgs overlay path uid gid;
+  common = ./common-cinnamon.nix;
+}

nix/vm/create-gnome.nix

@@ -0,0 +1,12 @@
+{
+  system,
+  nixpkgs,
+  overlay,
+  path,
+  uid ? 1000,
+  gid ? 1000,
+}:
+import ./create.nix {
+  inherit system nixpkgs overlay path uid gid;
+  common = ./common-gnome.nix;
+}

nix/vm/create-plasma6.nix

@@ -0,0 +1,12 @@
+{
+  system,
+  nixpkgs,
+  overlay,
+  path,
+  uid ? 1000,
+  gid ? 1000,
+}:
+import ./create.nix {
+  inherit system nixpkgs overlay path uid gid;
+  common = ./common-plasma6.nix;
+}

nix/vm/create.nix

@@ -3,6 +3,7 @@
   nixpkgs,
   overlay,
   path,
+  common ? ./common.nix,
   uid ? 1000,
   gid ? 1000,
 }: let
@@ -33,9 +34,9 @@ in
           uid = uid;
         };
 
-        system.stateVersion = "24.11";
+        system.stateVersion = nixpkgs.lib.trivial.release;
       }
-      ./common.nix
+      common
       path
     ];
   }