Split ISO config from installed hosts; auto-include gnome in generated host

flake.nix

@@ -13,16 +13,28 @@
     let
       lib = nixpkgs.lib;
       hostFiles = builtins.attrNames (builtins.readDir ./hosts);
-      hostNames = lib.filter (name:
+      hostNames =
-        lib.hasSuffix ".nix" name && !(lib.hasSuffix "-hardware.nix" name)
+        lib.filter (name:
-      ) hostFiles;
+          lib.hasSuffix ".nix" name
+          && !(lib.hasSuffix "-hardware.nix" name)
+          && name != "iso.nix"
+        )
+        hostFiles;
       mkHost = name: lib.nixosSystem {
         system = "x86_64-linux";
         specialArgs = { inherit inputs; };
         modules = [ (./hosts + "/${name}.nix") ];
       };
     in {
-      nixosConfigurations = lib.genAttrs (map (lib.removeSuffix ".nix") hostNames) mkHost;
+      nixosConfigurations =
+        lib.genAttrs (map (lib.removeSuffix ".nix") hostNames) mkHost
+        // {
+          installer = nixpkgs.lib.nixosSystem {
+            system = "x86_64-linux";
+            specialArgs = { inherit inputs; };
+            modules = [ ./hosts/iso.nix ];
+          };
+        };
 
       packages.x86_64-linux.install-iso =
         self.nixosConfigurations.installer.config.system.build.isoImage;

hosts/installer.nix

@@ -2,7 +2,6 @@
 
 {
   imports = [
-    (inputs.nixpkgs + "/nixos/modules/installer/cd-dvd/installation-cd-minimal.nix")
     inputs.lix-module.nixosModules.lixFromNixpkgs
     ../modules/system/base.nix
     ../modules/desktop/gnome-minimal.nix

hosts/iso.nix

@@ -0,0 +1,25 @@
+{ config, pkgs, inputs, ... }:
+
+# ISO-only configuration (uses installation-cd profile). Do not use for installed systems.
+{
+  imports = [
+    (inputs.nixpkgs + "/nixos/modules/installer/cd-dvd/installation-cd-minimal.nix")
+    inputs.lix-module.nixosModules.lixFromNixpkgs
+    ../modules/system/base.nix
+    ../modules/desktop/gnome-minimal.nix
+    ../modules/users/admin.nix
+  ];
+
+  networking.hostName = "iso-installer";
+
+  environment.etc."INSTALL.txt".source = ../docs/install-help.txt;
+  environment.etc."motd".text = builtins.readFile ../docs/install-help.txt;
+  environment.etc."issue".text = ''
+${builtins.readFile ../docs/install-help.txt}
+
+Login: \l
+  '';
+
+  # Embed the repo in the live ISO.
+  environment.etc."nixos".source = ../.;
+}

scripts/install-btrfs.sh

@@ -2,10 +2,10 @@
 set -euo pipefail
 
 # Non-interactive Btrfs installer using the flake in this repo.
-# Defaults: DISK=/dev/vda HOSTNAME=nanuqsaurus
+# Defaults: DISK=/dev/vda HOSTNAME=installer
 
 DISK=${DISK:-/dev/vda}
-HOSTNAME=${HOSTNAME:-nanuqsaurus}
+HOSTNAME=${HOSTNAME:-installer}
 
 SCRIPT_DIR=$(cd -- "$(dirname "${BASH_SOURCE[0]}")" && pwd)
 REPO_ROOT=$(cd -- "${SCRIPT_DIR}/.." && pwd)
@@ -55,6 +55,7 @@ if [ ! -e "${host_file}" ]; then
   imports = [
     inputs.lix-module.nixosModules.lixFromNixpkgs
     ../modules/system/base.nix
+    ../modules/desktop/gnome-minimal.nix
     ../modules/users/admin.nix
     ./${HOSTNAME}-hardware.nix
   ];