fix: nixos-hardware's apple-t2 hardcoded some path

hosts/12kingdoms/shoukei/apple-set-os-loader.nix

@@ -0,0 +1,61 @@
+{
+  pkgs,
+  config,
+  lib,
+  ...
+}: let
+  t2Cfg = config.hardware.myapple-t2;
+  efiPrefix = config.boot.loader.efi.efiSysMountPoint;
+
+  apple-set-os-loader-installer = pkgs.stdenv.mkDerivation rec {
+    name = "apple-set-os-loader-installer-1.0";
+    src = pkgs.fetchFromGitHub {
+      owner = "Redecorating";
+      repo = "apple_set_os-loader";
+      rev = "r33.9856dc4";
+      sha256 = "hvwqfoF989PfDRrwU0BMi69nFjPeOmSaD6vR6jIRK2Y=";
+    };
+    buildInputs = [pkgs.gnu-efi];
+    buildPhase = ''
+      substituteInPlace Makefile --replace "/usr" '$(GNU_EFI)'
+      export GNU_EFI=${pkgs.gnu-efi}
+      make
+    '';
+    installPhase = ''
+      install -D bootx64_silent.efi $out/bootx64.efi
+    '';
+  };
+in {
+  options = {
+    hardware.myapple-t2.enableAppleSetOsLoader = lib.mkOption {
+      default = false;
+      type = lib.types.bool;
+      description = "Whether to enable the appleSetOsLoader activation script.";
+    };
+  };
+
+  config = {
+    # Activation script to install apple-set-os-loader in order to unlock the iGPU
+    system.activationScripts.myappleSetOsLoader = lib.optionalString t2Cfg.enableAppleSetOsLoader ''
+      if [[ -e ${efiPrefix}/efi/boot/bootx64_original.efi ]]; then
+        true # It's already installed, no action required
+      elif [[ -e ${efiPrefix}/efi/boot/bootx64.efi ]]; then
+        # Copy the new bootloader to a temporary location
+        cp ${apple-set-os-loader-installer}/bootx64.efi ${efiPrefix}/efi/boot/bootx64_temp.efi
+
+        # Rename the original bootloader
+        mv ${efiPrefix}/efi/boot/bootx64.efi ${efiPrefix}/efi/boot/bootx64_original.efi
+
+        # Move the new bootloader to the final destination
+        mv ${efiPrefix}/efi/boot/bootx64_temp.efi ${efiPrefix}/efi/boot/bootx64.efi
+      else
+        echo "Error: ${efiPrefix}/efi/boot/bootx64.efi is missing" >&2
+      fi
+    '';
+
+    # Enable the iGPU by default if present
+    environment.etc."modprobe.d/apple-gmux.conf".text = lib.optionalString t2Cfg.enableAppleSetOsLoader ''
+      options apple-gmux force_igd=y
+    '';
+  };
+}

hosts/12kingdoms/shoukei/default.nix

@@ -12,7 +12,8 @@
 {
   imports = [
     nixos-hardware.nixosModules.apple-t2
-    {hardware.apple-t2.enableAppleSetOsLoader = true;}
+    ./apple-set-os-loader.nix
+    {hardware.myapple-t2.enableAppleSetOsLoader = true;}
 
     ./hardware-configuration.nix
     ./impermanence.nix