feat: use nixos-rebuild build-image instead of nixosGenerators

flake.lock

@@ -329,42 +329,6 @@
         "type": "github"
       }
     },
-    "nixlib": {
-      "locked": {
-        "lastModified": 1736643958,
-        "narHash": "sha256-tmpqTSWVRJVhpvfSN9KXBvKEXplrwKnSZNAoNPf/S/s=",
-        "owner": "nix-community",
-        "repo": "nixpkgs.lib",
-        "rev": "1418bc28a52126761c02dd3d89b2d8ca0f521181",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-community",
-        "repo": "nixpkgs.lib",
-        "type": "github"
-      }
-    },
-    "nixos-generators": {
-      "inputs": {
-        "nixlib": "nixlib",
-        "nixpkgs": [
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1769813415,
-        "narHash": "sha256-nnVmNNKBi1YiBNPhKclNYDORoHkuKipoz7EtVnXO50A=",
-        "owner": "nix-community",
-        "repo": "nixos-generators",
-        "rev": "8946737ff703382fda7623b9fab071d037e897d5",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-community",
-        "repo": "nixos-generators",
-        "type": "github"
-      }
-    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1771207753,
@@ -484,7 +448,6 @@
         "home-manager": "home-manager",
         "lanzaboote": "lanzaboote",
         "neovim-nightly-overlay": "neovim-nightly-overlay",
-        "nixos-generators": "nixos-generators",
         "nixpkgs": "nixpkgs_2",
         "nixpkgs-master": "nixpkgs-master",
         "nixpkgs-unstable": "nixpkgs-unstable",

flake.nix

@@ -17,11 +17,6 @@
 
     flake-utils.url = "github:numtide/flake-utils";
 
-    nixos-generators = {
-      url = "github:nix-community/nixos-generators";
-      inputs.nixpkgs.follows = "nixpkgs";
-    };
-
     home-manager = {
       url = "github:nix-community/home-manager/release-25.11";
       inputs.nixpkgs.follows = "nixpkgs";
@@ -51,7 +46,6 @@
     inputs@{
       nixpkgs,
       flake-utils,
-      nixos-generators,
       ...
     }:
 
@@ -73,15 +67,6 @@
     {
       lib = my-lib;
 
-      # nix build .#iso
-      # dd bs=4M if=result/iso/my-nixos-live.iso of=/dev/sdX status=progress oflag=sync
-      live-iso = nixos-generators.nixosGenerate {
-        system = "x86_64-linux";
-        format = "install-iso";
-        specialArgs = { inherit inputs; };
-        modules = [ ./hosts/live-iso/configuration.nix ];
-      };
-
       nixosConfigurations = {
         matej-nixos = mkHost "matej-nixos" {
           system = "x86_64-linux";
@@ -92,6 +77,11 @@
           users = [ "matej" ];
         };
 
+        # nixos-rebuild build-image --image-variant install-iso --flake .#live-iso
+        live-iso = mkHost "live-iso" {
+          system = "x86_64-linux";
+          users = [ ];
+        };
       };
 
       nixosModules = import ./modules/nixos {

hosts/live-iso/configuration.nix

@@ -1,7 +1,14 @@
 { pkgs, lib, ... }:
 {
-  # Use zstd instead of xz for compressing the liveUSB image, it's 6x faster and 15% bigger.
-  isoImage.squashfsCompression = "zstd -Xcompression-level 6";
+  image.modules.iso-installer = {
+    isoImage.squashfsCompression = "zstd -Xcompression-level 6";
+  };
+
+  fileSystems."/" = lib.mkDefault {
+    device = "/dev/disk/by-label/nixos";
+    fsType = "ext4";
+  };
+  boot.loader.grub.device = lib.mkDefault "/dev/sda";
 
   services.openssh = {
     enable = true;
@@ -14,10 +21,7 @@
     };
   };
 
-  networking = {
-    useDHCP = true;
-    firewall.allowedTCPPorts = [ 22 ];
-  };
+  networking.firewall.allowedTCPPorts = [ 22 ];
 
   users = {
     groups.matej = {

justfile

@@ -19,7 +19,7 @@ bump: update switch
 
 # build installation iso
 iso:
-    nix build .#live-iso
+    nixos-rebuild build-image --image-variant iso-installer --flake .#live-iso
 
 # garbage collect old generations
 clean:

lib/mkHost.nix

@@ -13,25 +13,25 @@ name:
 let
   hostConfig = ../hosts/${name}/configuration.nix;
   hostHWConfig = ../hosts/${name}/hardware-configuration.nix;
+  hasHWConfig = builtins.pathExists hostHWConfig;
 
   userHMConfigs = nixpkgs.lib.genAttrs users (
     user: import ../users/${user}/home-manager.nix { inherit inputs; }
   );
 
 in
-
 nixpkgs.lib.nixosSystem {
   inherit system;
   modules = [
-
     ../nix.nix
 
     { nixpkgs.overlays = overlays; }
     { nixpkgs.config.allowUnfree = true; }
 
     hostConfig
-    hostHWConfig
-
+  ]
+  ++ nixpkgs.lib.optional hasHWConfig hostHWConfig
+  ++ [
     inputs.home-manager.nixosModules.home-manager
     {
       home-manager.useGlobalPkgs = true;
@@ -39,7 +39,6 @@ nixpkgs.lib.nixosSystem {
       home-manager.users = userHMConfigs;
       home-manager.extraSpecialArgs = { inherit inputs; };
     }
-
   ];
   specialArgs = { inherit inputs; };
 }