refactor: don't include the whole modules

Instead only import the nixos/hm/nixvim module.

This _should_ reduce rebuilds.

example-vm/default.nix

@@ -0,0 +1,40 @@
+{
+  import = [ ./vm_config.nix ];
+
+  time.timeZone = "Europe/Berlin";
+  i18n.defaultLocale = "en_US.UTF-8";
+  users.users.jdoe = {
+    password = "example";
+    isNormalUser = true;
+    extraGroups = [
+      "wheel"
+      "video"
+      "networkmanager"
+    ];
+  };
+  home-manager.users.jdoe = {
+    home = {
+      username = "jdoe";
+      homeDirectory = "/home/jdoe";
+    };
+    jhome = {
+      enable = true;
+      gui.enable = true;
+      dev = {
+        enable = true;
+        rust.enable = true;
+      };
+    };
+  };
+
+  # password is 'test' see module documentation for more options
+  services.jupyter.password = "'sha1:1b961dc713fb:88483270a63e57d18d43cf337e629539de1436ba'";
+  jconfig = {
+    enable = true;
+    dev = {
+      enable = true;
+      jupyter.enable = true;
+    };
+    gui.enable = true;
+  };
+}

example-vm/vm-config.nix

@@ -1,31 +1,34 @@
+## Default QEMU guest config
 {
-  services.qemuGuest.enable = true;
+  services = {
+    qemuGuest.enable = true;
+    openssh.enable = true;
+  };
 
-  boot.initrd.availableKernelModules = [
+  boot = {
-    "xhci_pci"
+    loader.systemd-boot.enable = true;
-    "ehci_pci"
+    initrd.availableKernelModules = [
-    "ahci"
+      "xhci_pci"
-    "usbhid"
+      "ehci_pci"
-    "usb_storage"
+      "ahci"
-    "sd_mod"
+      "usbhid"
-    "virtio_balloon"
+      "usb_storage"
-    "virtio_blk"
+      "sd_mod"
-    "virtio_pci"
+      "virtio_balloon"
-    "virtio_ring"
+      "virtio_blk"
-    # "virtio_vga"
+      "virtio_pci"
-    "virtio_gpu"
+      "virtio_ring"
-  ];
+      # "virtio_vga"
+      "virtio_gpu"
+    ];
+  };
   fileSystems."/".device = "/dev/disk/by-label/nixos";
 
-  boot.loader.systemd-boot.enable = true;
-
-  services.openssh.enable = true;
-
   # This value determines the NixOS release from which the default
   # settings for stateful data, like file locations and database versions
   # on your system were taken. It‘s perfectly fine and recommended to leave
   # this value at the release version of the first install of this system.
   # Before changing this value read the documentation for this option
   # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
-  system.stateVersion = "22.11"; # Did you read the comment?
+  system.stateVersion = "24.11"; # Did you read the comment?
 }

flake-modules/example-vm.nix

@@ -11,46 +11,8 @@ in
     inherit pkgs;
     modules = [
       inputs.self.nixosModules.default
-      ../machines/vm
+      ../example-vm # import vm configuration
-      # import vm module
+      { nix.registry.nixpkgs.flake = inputs.nixpkgs; }
-      {
-        time.timeZone = "Europe/Berlin";
-        i18n.defaultLocale = "en_US.UTF-8";
-        users.users.jdoe = {
-          password = "example";
-          isNormalUser = true;
-          extraGroups = [
-            "wheel"
-            "video"
-            "networkmanager"
-          ];
-        };
-        home-manager.users.jdoe = {
-          home = {
-            username = "jdoe";
-            homeDirectory = "/home/jdoe";
-          };
-          jhome = {
-            enable = true;
-            gui.enable = true;
-            dev = {
-              enable = true;
-              rust.enable = true;
-            };
-          };
-        };
-        nix.registry.nixpkgs.flake = inputs.nixpkgs;
-        # password is 'test' see module documentation for more options
-        services.jupyter.password = "'sha1:1b961dc713fb:88483270a63e57d18d43cf337e629539de1436ba'";
-        jconfig = {
-          enable = true;
-          dev = {
-            enable = true;
-            jupyter.enable = true;
-          };
-          gui.enable = true;
-        };
-      }
     ];
   };