name: Build Kernel
on:
  push:
    branches: [ "main" ]
    paths: 
      - '.github/workflows/build-kernel.yml'
      - 'kernel/**'
  pull_request:
    branches: [ "main" ]
    paths: 
      - 'kernel/**'
jobs:
  build:
    strategy:
      matrix:
        include:
          - version: android12-5.10-66
            tag: android12-5.10-2021-11
            os_version: 12.0.0
            os_patch_level: 2021-11
          - version: android12-5.10-81
            tag: android12-5.10-2022-03
            os_version: 12.0.0
            os_patch_level: 2022-03
          - version: android12-5.10-101
            tag: android12-5.10-2022-05
            os_version: 12.0.0
            os_patch_level: 2022-05
          - version: android12-5.10-110
            tag: android12-5.10-2022-07
            os_version: 12.0.0
            os_patch_level: 2022-07
          - version: android12-5.10-136
            tag: android12-5.10-2022-11
            os_version: 12.0.0
            os_patch_level: 2022-11

    name: Build aarch64-${{ matrix.version }}
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v3
      with:
        path: KernelSU
    - name: Download kernel source
      run: |
        cd $GITHUB_WORKSPACE
        git clone https://gerrit.googlesource.com/git-repo
        mkdir android-kernel && cd android-kernel
        ../git-repo/repo init -u https://android.googlesource.com/kernel/manifest -b common-${{ matrix.tag }}
        ../git-repo/repo sync
        echo "[+] KernelSU setup"
        GKI_ROOT=$(pwd)
        echo "[+] GKI_ROOT: $GKI_ROOT"
        echo "[+] Copy kernel su driver to $GKI_ROOT/common/drivers"
        ln -sf $GITHUB_WORKSPACE/KernelSU/kernel $GKI_ROOT/common/drivers/kernelsu
        echo "[+] Add kernel su driver to Makefile"
        DRIVER_MAKEFILE=$GKI_ROOT/common/drivers/Makefile
        grep -q "kernelsu" $DRIVER_MAKEFILE || echo "obj-y += kernelsu/" >> $DRIVER_MAKEFILE
        echo "[+] KernelSU setup Done."
        curl -Lo gki-kernel.zip https://dl.google.com/android/gki/gki-certified-boot-${{ matrix.tag }}_r1.zip
        unzip gki-kernel.zip
        tools/mkbootimg/unpack_bootimg.py --boot_img=$(find . -maxdepth 1 -name "*.img")
    
    - name: Build boot.img
      working-directory: android-kernel
      run: BUILD_BOOT_IMG=1 SKIP_VENDOR_BOOT=1 KERNEL_BINARY=Image GKI_RAMDISK_PREBUILT_BINARY=out/ramdisk AVB_SIGN_BOOT_IMG=1 AVB_BOOT_PARTITION_SIZE=$((64*1024*1024)) AVB_BOOT_ALGORITHM=SHA256_RSA2048 AVB_BOOT_KEY=prebuilts/kernel-build-tools/linux-x86/share/avb/testkey_rsa2048.pem BOOT_IMAGE_HEADER_VERSION=4 LTO=thin BUILD_CONFIG=common/build.config.gki.aarch64 build/build.sh
    
    - name: Build boot-lz4.img
      working-directory: android-kernel
      run: |
        tools/mkbootimg/mkbootimg.py --header_version 4 --kernel ./out/android12-5.10/dist/Image.lz4 --ramdisk out/ramdisk --output ./out/android12-5.10/dist/boot-lz4.img --os_version ${{ matrix.os_version }} --os_patch_level ${{ matrix.os_patch_level }}
        ./build/build-tools/path/linux-x86/avbtool add_hash_footer --partition_name boot --partition_size $((64*1024*1024)) --image out/android12-5.10/dist/boot-lz4.img --algorithm SHA256_RSA2048 --key ./prebuilts/kernel-build-tools/linux-x86/share/avb/testkey_rsa2048.pem

    - name: Build boot-gz.img
      working-directory: android-kernel
      run: |
        cat out/android12-5.10/dist/Image | ./prebuilts/build-tools/path/linux-x86/gzip -n -f -9 > out/android12-5.10/dist/Image.gz
        tools/mkbootimg/mkbootimg.py --header_version 4 --kernel ./out/android12-5.10/dist/Image.gz --ramdisk out/ramdisk --output ./out/android12-5.10/dist/boot-gz.img --os_version ${{ matrix.os_version }} --os_patch_level ${{ matrix.os_patch_level }}
        ./build/build-tools/path/linux-x86/avbtool add_hash_footer --partition_name boot --partition_size $((64*1024*1024)) --image out/android12-5.10/dist/boot-gz.img --algorithm SHA256_RSA2048 --key ./prebuilts/kernel-build-tools/linux-x86/share/avb/testkey_rsa2048.pem

    - name: Upload Image.gz
      uses: actions/upload-artifact@v3
      with:
        name: kernel-aarch64-${{ matrix.version }}-Image.gz
        path: android-kernel/out/*/dist/Image.gz

    - name: Upload boot.img
      uses: actions/upload-artifact@v3
      with:
        name: kernel-aarch64-${{ matrix.version }}-boot.img
        path: android-kernel/out/*/dist/boot.img

    - name: Upload boot-lz4.img
      uses: actions/upload-artifact@v3
      with:
        name: kernel-aarch64-${{ matrix.version }}-boot-lz4.img
        path: android-kernel/out/*/dist/boot-lz4.img

    - name: Upload boot-gz.img
      uses: actions/upload-artifact@v3
      with:
        name: kernel-aarch64-${{ matrix.version }}-boot-gz.img
        path: android-kernel/out/*/dist/boot-gz.img