build-release-kernels.yml

name: Build & Release Latest Kernel
on:
  schedule:
    - cron: '17 */12 * * *' # “At minute 17 past every 12th hour.”
  workflow_dispatch:

jobs:

  check-for-newer-kernel:

    runs-on: ubuntu-latest

    outputs:
      new_kernel: ${{ steps.check_for_new_kernel.outputs.new_kernel }}
      latest_kernel: ${{ steps.check_for_new_kernel.outputs.latest_kernel }}

    steps:
      - name: Checkount linux-tkg
        uses: actions/checkout@v3.0.2

      # Get latest release in repo, so we compare its version
      # with the latest kernel available so far
      - name: Get latest release
        id: latest_release
        uses: pozetroninc/github-action-get-latest-release@master
        with:
          repository: ${{ github.repository }}
        # it fails when there's no release
        continue-on-error: true

      - name: Get latest kernel version
        id: check_for_new_kernel
        run: |
          ./.github/get_latest_kver.sh
          latest_kernel="$(cat .github/latest-kernel)"
          echo "latest_kernel=$latest_kernel" >> $GITHUB_OUTPUT
          new_kernel=0
          [[ "$latest_kernel" != "$latest_release" ]] || new_kernel=$?
          echo "new_kernel=$new_kernel" >> $GITHUB_OUTPUT
        env:
          latest_release: ${{ steps.latest_release.outputs.release }}

  build:
    strategy:
      fail-fast: false
      matrix:
        _cpusched: [bore, eevdf, pds, bmq]
        os: [arch, ubuntu, fedora]
    uses: ./.github/workflows/builder-dispatcher.yml
    with:
      _cpusched: ${{ matrix._cpusched }}
      os: ${{ matrix.os }}

    needs: [check-for-newer-kernel]
    if: |
      github.ref == 'refs/heads/master' &&
      needs.check-for-newer-kernel.outputs.new_kernel == '0'

  make-release:

    runs-on: ubuntu-latest

    needs:
      - "check-for-newer-kernel"
      - "build"
    if: needs.build.result == 'success'

    steps:
      - name: Download release artifacts
        uses: actions/download-artifact@v4.1.7

      - name: Make new release
        uses: "marvinpinto/action-automatic-releases@latest"
        with:
          repo_token: "${{ secrets.GITHUB_TOKEN }}"
          automatic_release_tag: ${{ needs.check-for-newer-kernel.outputs.latest_kernel }}
          prerelease: false
          title: "[experimental] ${{ needs.check-for-newer-kernel.outputs.latest_kernel }}"
          files: |
            ${{ github.workspace }}/arch-kernel-packages-*/**
            ${{ github.workspace }}/ubuntu-kernel-packages-*/**
            ${{ github.workspace }}/fedora-kernel-packages-*/**