name: Build Custom Kernel

on:
  push:
    branches:
      - master

jobs:
  build-kernel:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Set up Nix
        run: |
          sudo apt-get update
          sudo apt-get install -y \
            curl \
            git \
            xz-utils \
            ca-certificates
          curl -L https://nixos.org/nix/install | sh -s -- --daemon

      - name: Build custom kernel
        run: |
          export NIX_BUILD_CORES=0
          nix-build '<nixpkgs/nixos>' -A config.system.build.kernel --arg configuration ./custom-kernel.nix
        env:
          PATH: /nix/var/nix/profiles/default/bin:/nix/var/nix/profiles/default/sbin:/bin:/sbin:/usr/bin:/usr/sbin

      - name: Prepare kernel artifacts
        run: |
          mkdir result-writable
          cp -rL result/lib/modules/6.6.63/kernel result-writable/kernel
          sudo chmod -R u+rwX,g+rwX,o+rX result-writable
          tar -czf custom-kernel.tar.gz -C result-writable .
          rm -rf result-writable

      - name: Upload kernel artifacts
        uses: actions/upload-artifact@v3
        with:
          name: custom-kernel
          path: ./custom-kernel.tar.gz