woah this vm shit is so so cool

.gitignore

@@ -0,0 +1,2 @@
+result
+*.qcow2

flake.nix

@@ -8,23 +8,20 @@
     };
   };
 
-  outputs = inputs @ {
-    self,
-    nixpkgs,
-    nixpkgs-unstable,
-    home-manager,
-    ...
-  }: let
-    mkHost = hostname: graphical: {
+  outputs =
+    inputs @ { self
+    , nixpkgs
+    , nixpkgs-unstable
+    , home-manager
+    , ...
+    }:
+    let
+      system = "x86_64-linux";
+      mkHost = hostname: {
         imports = [
           ./hosts/${hostname}/configuration.nix
           ./modules/common
           (import "${home-manager}/nixos")
-        (
-          if graphical
-          then ./modules/graphical
-          else null
-        )
         ];
 
         deployment = {
@@ -33,17 +30,25 @@
           allowLocalDeployment = true;
         };
       };
-  in {
+    in
+    {
       formatter.x86_64-linux = nixpkgs.legacyPackages.x86_64-linux.alejandra;
       colmena = {
         meta = {
           nixpkgs = import nixpkgs {
             system = "x86_64-linux";
-          overlays = [];
+            overlays = [ ];
           };
         };
 
-      bengal = mkHost "bengal" true;
+        bengal = mkHost "bengal";
+      };
+      nixosConfigurations.test = nixpkgs.lib.nixosSystem {
+        inherit system;
+        modules = [
+          ./hosts/test-vm/configuration.nix
+          (import "${home-manager}/nixos")
+        ];
       };
     };
 }

hosts/bengal/configuration.nix

@@ -12,6 +12,8 @@
     ./hardware-configuration.nix
   ];
 
+  cherrykitten.graphical.enable = true;
+
   boot.loader.systemd-boot.enable = true;
 
   networking.hostName = "bengal";

hosts/test-vm/configuration.nix

@@ -0,0 +1,39 @@
+{ config, lib, pkgs, ... }: {
+
+  imports = [
+    ../../modules/common
+    ../../modules/graphical
+  ];
+
+  cherrykitten.graphical.enable = false;
+
+  users.users.admin = {
+    isNormalUser = true;
+    extraGroups = [ "wheel" ];
+    password = "admin";
+    group = "admin";
+  };
+
+  users.groups.admin = { };
+
+  virtualisation.vmVariant = {
+    # following configuration is added only when building VM with build-vm
+    virtualisation = {
+      memorySize = 8192;
+      cores = 6;
+      graphics = true;
+    };
+  };
+
+  services.openssh = {
+    enable = true;
+    settings.PasswordAuthentication = lib.mkForce true;
+  };
+
+  networking.firewall.allowedTCPPorts = [ 22 ];
+  environment.systemPackages = with pkgs; [
+    htop
+  ];
+
+  system.stateVersion = "23.10";
+}

modules/common/default.nix

@@ -1,16 +1,29 @@
+{ lib
+, config
+, pkgs
+, ...
+}:
+let
+  cfg = config.cherrykitten.common;
+in
 {
-  lib,
-  config,
-  pkgs,
-  ...
-}: {
   imports = [
     ../users
     ./security.nix
     ./yubikey.nix
+    ../graphical
   ];
 
-  nix.settings.experimental-features = ["nix-command" "flakes"];
+  options.cherrykitten.common = {
+    test = lib.mkOption {
+      type = lib.types.str;
+      default = "nya";
+      example = "nyanya";
+    };
+  };
+
+  config = {
+    nix.settings.experimental-features = [ "nix-command" "flakes" ];
 
     time.timeZone = "Europe/Berlin";
 
@@ -22,7 +35,7 @@
     };
 
     fonts = {
-    enableDefaultFonts = true;
+      enableDefaultPackages = true;
       packages = with pkgs; [
         noto-fonts
         noto-fonts-cjk
@@ -31,10 +44,10 @@
         nerdfonts
       ];
       fontconfig = {
-      defaultFonts.emoji = ["Noto Emoji"];
-      defaultFonts.serif = ["Monaspace Xenon" "FiraCode Nerd Font" "Hack Nerd Font" "NotoSans Nerd Font"];
-      defaultFonts.sansSerif = ["Monaspace Xenon" "FiraCode Nerd Font" "Hack Nerd Font" "NotoSerif Nerd Font"];
-      defaultFonts.monospace = ["Monaspace Xenon" "FiraCode Nerd Font" "Hack Nerd Font"];
+        defaultFonts.emoji = [ "Noto Emoji" ];
+        defaultFonts.serif = [ "Monaspace Xenon" "FiraCode Nerd Font" "Hack Nerd Font" "NotoSans Nerd Font" ];
+        defaultFonts.sansSerif = [ "Monaspace Xenon" "FiraCode Nerd Font" "Hack Nerd Font" "NotoSerif Nerd Font" ];
+        defaultFonts.monospace = [ "Monaspace Xenon" "FiraCode Nerd Font" "Hack Nerd Font" ];
       };
     };
 
@@ -46,4 +59,5 @@
       pinentry
       wget
     ];
+  };
 }

modules/graphical/default.nix

@@ -1,9 +1,17 @@
+{ pkgs
+, config
+, lib
+, ...
+}:
+let
+  cfg = config.cherrykitten.graphical;
+in
 {
-  pkgs,
-  config,
-  lib,
-  ...
-}: {
+  options.cherrykitten.graphical = {
+    enable = lib.mkEnableOption (lib.mdDoc "graphical stuffs");
+  };
+
+  config = lib.mkIf cfg.enable {
     services.xserver = {
       enable = true;
       displayManager.sddm.enable = true;
@@ -53,4 +61,5 @@
         };
       };
     };
+  };
 }

modules/users/default.nix

@@ -12,7 +12,7 @@
     };
   };
 
-  home-manager.useGlobalPkgs = true;
+  home-manager.useUserPackages = true;
   home-manager.users = {
     sammy.imports = [./sammy.nix];
   };