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feat: add installer for apple-set-os-loader-installer
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## NixOS on T2 Macs
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# NixOS on T2 Macs
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This is the `nixos-hardware` module of the [T2 Linux Project](https://t2linux.org).
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Following [this guide](https://wiki.t2linux.org/distributions/nixos/installation/) is the recommended way to install, as it incudes the extra things you have to do on a T2 Mac.
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You can consult the [wiki](https://wiki.t2linux.org/) for information specific to T2 Macs.
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## Unlocking Internal iGPU
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The `apple-set-os-loader-installer.nix` module serves as an installer for the [`apple-set-os-loader`](https://github.com/Redecorating/apple_set_os-loader). This tool is designed to unlock the internal integrated GPU (iGPU) on certain MacBooks. See https://wiki.t2linux.org/guides/hybrid-graphics/ for more details.
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### What it Does:
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Upon activation, this module performs the following:
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- Renames the existing `BOOTX64.EFI` file to `bootx64_original.efi`.
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- Installs the `apple-set-os-loader` hook in its place as `bootx64.efi`.
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- Before the system boots the hook unlocks the iGPU and subsequently calls the original `bootx64_original.efi`.
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### How to Implement:
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1. **Integrate the apple-set-os-loader installer** into your `configuration.nix`:
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```
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imports = [
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...
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"${builtins.fetchGit { url = "https://github.com/NixOS/nixos-hardware.git"; }}/apple/t2/apple-set-os-loader-installer.nix"
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];
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```
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2. **Rebuild your system**:
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```
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sudo nixos-rebuild switch
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```
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> **Note**: Always ensure compatibility and make backups of your data before making any system changes.
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41
apple/t2/apple-set-os-loader-installer.nix
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41
apple/t2/apple-set-os-loader-installer.nix
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{ config, pkgs, ... }:
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let
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apple-set-os-loader-installer = pkgs.stdenv.mkDerivation rec {
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name = "apple-set-os-loader-installer-1.0";
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src = pkgs.fetchFromGitHub {
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owner = "Redecorating";
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repo = "apple_set_os-loader";
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rev = "r33.9856dc4";
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sha256 = "hvwqfoF989PfDRrwU0BMi69nFjPeOmSaD6vR6jIRK2Y=";
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};
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buildInputs = [ pkgs.gnu-efi ];
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buildPhase = ''
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substituteInPlace Makefile --replace "/usr" '$(GNU_EFI)'
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export GNU_EFI=${pkgs.gnu-efi}
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make
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'';
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installPhase = ''
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install -D bootx64_silent.efi $out/bootx64.efi
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'';
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};
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in
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{
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system.activationScripts.hybrid-graphics = {
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text = ''
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if [[ -e /boot/efi/EFI/BOOT/bootx64_original.efi ]]; then
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# We interpret this as apple-set-os-loader being already installed
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exit 0
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elif [[ -e /boot/efi/EFI/BOOT/BOOTX64.EFI ]] then
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mv /boot/efi/EFI/BOOT/BOOTX64.EFI /boot/efi/EFI/BOOT/bootx64_original.efi
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cp ${apple-set-os-loader-installer}/bootx64.efi /boot/efi/EFI/BOOT/bootx64.efi
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else
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echo "Error: /boot/efi/EFI/BOOT/BOOTX64.EFI is missing"
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fi
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'';
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};
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environment.etc."modprobe.d/apple-gmux.conf".text = ''
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# Enable the iGPU by default if present
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options apple-gmux force_igd=y
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'';
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environment.systemPackages = with pkgs; [ apple-set-os-loader-installer ];
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}
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