feat: Add support for ipxe boot ephemeral systems

hosts/types/nix-desktop.nix

@@ -30,6 +30,7 @@
 
       host.filesystem.swapSize = lib.mkDefault "16G";
       host.filesystem.device = lib.mkDefault "/dev/nvme0n1";
+      host.buildMethods = lib.mkDefault [ "installer-iso" ];
       nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
 
       hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;

hosts/types/nix-ephemeral.nix

@@ -0,0 +1,54 @@
+{ inputs, ... }:
+[
+  (
+    {
+      config,
+      lib,
+      modulesPath,
+      ...
+    }:
+    {
+      imports = [ (modulesPath + "/installer/scan/not-detected.nix") ];
+
+      boot.initrd.availableKernelModules = [
+        "xhci_pci"
+        "nvme"
+        "usb_storage"
+        "sd_mod"
+        "sdhci_pci"
+      ];
+      boot.initrd.kernelModules = [ ];
+      boot.kernelModules = [ "kvm-intel" ];
+      boot.extraModulePackages = [ ];
+      boot.kernelParams = [
+        "quiet"
+        "splash"
+        "boot.shell_on_fail"
+        "udev.log_priority=3"
+        "rd.systemd.show_status=auto"
+      ];
+
+      # Ephemeral setup: No swap, no disk
+      host.filesystem.swapSize = lib.mkForce "0G";
+      host.filesystem.device = lib.mkForce "/dev/null"; # Dummy device
+      host.buildMethods = lib.mkDefault [ "iso" "ipxe" ];
+      
+      # Disable Disko config since we are running from RAM/ISO
+      disko.enableConfig = lib.mkForce false;
+
+      # Define a dummy root filesystem to satisfy assertions
+      fileSystems."/" = {
+        device = "none";
+        fsType = "tmpfs";
+        options = [ "defaults" "size=50%" "mode=755" ];
+      };
+
+      nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+      hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+    }
+  )
+  {
+    modules.sw.enable = true;
+    modules.sw.type = "stateless-kiosk";
+  }
+]

hosts/types/nix-laptop.nix

@@ -37,6 +37,7 @@
 
       host.filesystem.device = lib.mkDefault "/dev/nvme0n1";
       host.filesystem.swapSize = lib.mkDefault "34G";
+      host.buildMethods = lib.mkDefault [ "installer-iso" ];
 
       # Suspend / logind behavior
       services.upower.enable = lib.mkDefault true;

hosts/types/nix-surface.nix

@@ -45,6 +45,7 @@
 
       host.filesystem.swapSize = lib.mkDefault "8G";
       host.filesystem.device = lib.mkDefault "/dev/mmcblk0";
+      host.buildMethods = lib.mkDefault [ "installer-iso" ];
       nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
 
       hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;