build.yml

name: Kernel CI

on:
  push:
    branches: [ main ]
  pull_request:
    branches: [ main ]
  workflow_dispatch:
    # manual trigger
  schedule:
    - cron: '0 6,14,22 * * *'

env:
  IS_LTS: NO

jobs:
  build:
    runs-on: ubuntu-latest
    container: locietta/loia-dev-base:latest
    outputs:
      current_version: ${{ steps.out.outputs.current_version }}
      release_version: ${{ steps.out.outputs.release_version }}
      clang_version:   ${{ steps.out.outputs.clang_version }}
      rebuild_flag:    ${{ steps.out.outputs.rebuild_flag }}

    strategy:
      matrix:
        include:
          - arch: riscv
            image-name: vmlinux-riscv64

    steps:

    - uses: actions/checkout@main

    - name: Install dependencies
      id: dep
      run: |
        pacman -Syu --noconfirm pahole xmlto inetutils bc cpio jq llvm llvm-libs clang lld ccache zip unzip

    - name: Trust this directory
      run: git config --global --add safe.directory '*' # v2.35.3 or later

    - name: Initialize ccache
      uses: hendrikmuhs/ccache-action@v1.2
      with:
        max-size: 2048M
        key: ${{ github.job }}-${{ matrix.arch }}

    - name: Prepare source code
      shell: bash
      run: |
        export VERSION_BRANCH=v6.11
        git clone https://github.com/torvalds/linux -b $VERSION_BRANCH --depth 1 linux
        cd linux && ../config.sh
        scripts/config -d riscv # avoid override warning for duplicate arch flags 
        scripts/config -e ${{ matrix.arch }}

        # Load version info into env
        echo "CLANG_VERSION=$(pacman -Qs clang | grep local/clang | sed 's#^.*local\/clang.*[^0-9]\(.*\) (\(.*\))#\1#')" | tee -a $GITHUB_ENV

        export CURRENT_VERSION=$(grep 'LOCALVERSION=' ../riscv_defconfig | sed 's/^.*[^0-9]\([0-9]*\.[0-9]*\.[0-9]*\).*$/\1/')
        # must query with a token, or will fail with api rate limit on public runners
        export RELEASED_TAG=$(curl -sL -H 'Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}'\
         https://api.github.com/repos/ZLangJIT/riscv-kernel/tags\?per_page\=60 | jq -r '.[].name' | grep -v 'lts' | head -n 1)
        export RELEASED_VERSION=$(echo $RELEASED_TAG | sed 's/^.*[^0-9]\([0-9]*\.[0-9]*\.[0-9]*\).*$/\1/' )
        export RELEASED_MINOR=$(echo $RELEASED_TAG | sed 's/^.*[^0-9][0-9]*\.\([0-9]*\)\.[0-9]*\.*$/\1/' )

        echo "CURRENT_VERSION=$CURRENT_VERSION" | tee -a $GITHUB_ENV
        echo "RELEASED_VERSION=$RELEASED_VERSION" | tee -a $GITHUB_ENV

        if [[ $CURRENT_VERSION != $RELEASED_VERSION || \
              ($CURRENT_VERSION = $RELEASED_VERSION && 1 -gt "$RELEASED_MINOR") || \
              "${{ github.event_name }}" = 'pull_request' ]]; then
          echo "REBUILD_FLAG=1" | tee -a $GITHUB_ENV
        else
          echo "REBUILD_FLAG=" | tee -a $GITHUB_ENV
        fi

    - name: Build kernel
      if: ${{ env.REBUILD_FLAG }}
      run: |
        cd linux && ../build.sh

    - name: Copy ${{ matrix.image-name }}
      if: ${{ env.REBUILD_FLAG }}
      run: |
        cd linux
        mv vmlinux ../${{ matrix.image-name }}
        cd ..
        sha256sum ${{ matrix.image-name }} > ${{ matrix.image-name }}.sha256

    - name: Upload ${{ matrix.image-name }}
      uses: actions/upload-artifact@main
      if: ${{ env.REBUILD_FLAG }}
      with:
        name: ${{ matrix.image-name }}
        path: |
          ${{ matrix.image-name }}
          ${{ matrix.image-name }}.sha256

    - id: out
      run: |
        echo "current_version=${{ env.CURRENT_VERSION }}" >> $GITHUB_OUTPUT
        echo "release_version=${{ env.RELEASED_VERSION }}" >> $GITHUB_OUTPUT
        echo "clang_version=${{ env.CLANG_VERSION }}" >> $GITHUB_OUTPUT
        echo "rebuild_flag=${{ env.REBUILD_FLAG }}" >> $GITHUB_OUTPUT

  release:
    runs-on: ubuntu-latest
    needs: build

    steps:
    - uses: actions/checkout@main
    - uses: actions/download-artifact@main
      with:
        path: release_images/

    - id: fetch_commit_sha
      run: |
        if [ ${{ github.event_name }} = 'pull_request' ]; then
          echo "sha=${{ github.event.pull_request.head.sha }}" >> $GITHUB_OUTPUT
          echo "RELEASE_TAG=${{ needs.build.outputs.current_version }}-PR" | tee -a $GITHUB_ENV
        else
          echo "sha=${{ github.sha }}" >> $GITHUB_OUTPUT
          echo "RELEASE_TAG=${{ needs.build.outputs.current_version }}" | tee -a $GITHUB_ENV
        fi

    - name: Release
      uses: softprops/action-gh-release@master
      if: ${{ needs.build.outputs.rebuild_flag }}
      with:
        name:  ${{ env.RELEASE_TAG }}
        tag_name:  ${{ env.RELEASE_TAG }}
        draft: ${{ github.event_name == 'pull_request' }}
        target_commitish: ${{ steps.fetch_commit_sha.outputs.sha }}
        body: |
          RISC-V linux kernel, built with Clang ${{ needs.build.outputs.clang_version }}

          * `vmlinux` for riscv ( built-in busybox ramdisk - initrd.zip )

        files: |
          release_images/*/*
        token: ${{ secrets.GITHUB_TOKEN }}
        # generate_release_notes: true
        fail_on_unmatched_files: true