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 @@
+{
+  imports = [ ./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 = [
-    "xhci_pci"
-    "ehci_pci"
-    "ahci"
-    "usbhid"
-    "usb_storage"
-    "sd_mod"
-    "virtio_balloon"
-    "virtio_blk"
-    "virtio_pci"
-    "virtio_ring"
-    # "virtio_vga"
-    "virtio_gpu"
-  ];
+  boot = {
+    loader.systemd-boot.enable = true;
+    initrd.availableKernelModules = [
+      "xhci_pci"
+      "ehci_pci"
+      "ahci"
+      "usbhid"
+      "usb_storage"
+      "sd_mod"
+      "virtio_balloon"
+      "virtio_blk"
+      "virtio_pci"
+      "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

@@ -8,47 +8,11 @@ in
 {
   # Example vm configuration
   flake.nixosConfigurations.vm = lib.nixosSystem {
-    inherit system pkgs;
+    inherit pkgs;
     modules = [
-      inputs.self.nixosModules.vm # import vm module
-      {
-        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;
-        };
-      }
+      inputs.self.nixosModules.default
+      ../example-vm # import vm configuration
+      { nix.registry.nixpkgs.flake = inputs.nixpkgs; }
     ];
   };
 

flake-modules/home-modules.nix

@@ -1,7 +1,4 @@
 { self, inputs, ... }:
-let
-  modules = ../modules;
-in
 {
   # FIXME(25.05): this version of HM should have the flake module
   # imports = [ inputs.home-manager.flakeModules.home-manager ];
@@ -11,7 +8,7 @@ in
       defaultModules = [
         inputs.nixvim.homeManagerModules.nixvim
         self.nixvimModules.homeManager
-        (modules + "/hm")
+        ../modules/hm
       ];
       nixos = {
         imports = defaultModules;

flake-modules/nixos-modules.nix

@@ -4,9 +4,6 @@
   lib,
   ...
 }:
-let
-  modules = ../modules;
-in
 {
   flake.nixosModules =
     let
@@ -14,7 +11,7 @@ in
         imports = [
           inputs.stylix.nixosModules.stylix
           inputs.home-manager.nixosModules.home-manager
-          (modules + "/nixos")
+          ../modules/nixos
         ] ++ lib.optional (inputs.lix-module != null) inputs.lix-module.nixosModules.default;
         home-manager = {
           useGlobalPkgs = true;
@@ -24,20 +21,9 @@ in
         # Pin nixpkgs
         nix.registry.nixpkgs.flake = inputs.nixpkgs;
       };
-
-      machines = [ "vm" ];
-      mkMachine = hostname: {
-        imports = [
-          nixosModule
-          (import (../machines + "/${hostname}"))
-        ];
-        home-manager.sharedModules = [ { jhome.hostName = hostname; } ];
-      };
-      machineModules = lib.genAttrs machines mkMachine;
     in
     {
       default = nixosModule;
       inherit nixosModule;
-    }
-    // machineModules;
+    };
 }

flake-modules/nixvim-modules.nix

@@ -1,7 +1,4 @@
 { self, inputs, ... }:
-let
-  modules = ../modules;
-in
 {
   imports = [ inputs.nixvim.flakeModules.default ];
 
@@ -10,10 +7,14 @@ in
     checks.enable = false; # FIXME: borked due to nix-community/nixvim#3074
   };
 
-  flake.nixvimModules = {
-    standalone = modules + "/nixvim/standalone.nix";
-    homeManager = modules + "/nixvim";
-  };
+  flake.nixvimModules =
+    let
+      module = ../modules/nixvim;
+    in
+    {
+      standalone = "${module}/standalone.nix";
+      homeManager = module;
+    };
 
   perSystem =
     { system, ... }: