kernel-release.yml

name: Get the latest Kernel release for all maintained branches
on:
  schedule:
    - cron:  '0 7 * * *'
  workflow_dispatch:

jobs:
  get-kernel-release:
    strategy:
      matrix:
        branch: [main,alpha,beta,stable,lts,lts-old]
      fail-fast: false
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
      - name: Figure out branch
        id: figure-out-branch
        run: .github/workflows/figure-out-branch.sh '${{ matrix.branch }}'
      - name: Fetch latest Linux release
        if: steps.figure-out-branch.outputs.SKIP == 0
        id: fetch-latest-release
        run: |
          CHANNEL='${{ matrix.branch }}'
          if [[ "${CHANNEL}" = 'main' ]]; then
            KV=$(git ls-files 'sys-kernel/coreos-kernel/*ebuild' | head -n 1 | cut -d '-' -f 5- | cut -d . -f 1-2)
          else
            KV=$(curl -s -S -f -L '${{ steps.figure-out-branch.outputs.LINK }}/flatcar_production_image_packages.txt' | grep -o 'coreos-kernel.*' | cut -d '-' -f 3- | cut -d . -f 1-2)
          fi
          git clone --depth=1 --no-checkout https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git linux
          kernelVersion=$(git -C linux ls-remote --tags origin | cut -f2 | sed -n "/refs\/tags\/v${KV}\.[0-9]*$/s/^refs\/tags\/v//p" | sort -ruV | head -1)
          rm -rf linux
          echo "KERNEL_VERSION=${kernelVersion}" >>"${GITHUB_OUTPUT}"
      - name: Set up Flatcar SDK
        if: steps.figure-out-branch.outputs.SKIP == 0
        id: setup-flatcar-sdk
        run: .github/workflows/setup-flatcar-sdk.sh
      - name: Apply patch
        if: steps.figure-out-branch.outputs.SKIP == 0
        id: apply-patch
        env:
          TARGET: ${{ steps.figure-out-branch.outputs.BRANCH }}
          BASE_BRANCH: ${{ steps.figure-out-branch.outputs.BRANCH }}
          PATH: ${{ steps.setup-flatcar-sdk.outputs.path }}
          VERSION_NEW: ${{ steps.fetch-latest-release.outputs.KERNEL_VERSION }}
          PACKAGES_CONTAINER: ${{ steps.setup-flatcar-sdk.outputs.PACKAGES_CONTAINER }}
          SDK_NAME: ${{ steps.setup-flatcar-sdk.outputs.SDK_NAME }}
        run: .github/workflows/kernel-apply-patch.sh
      - name: Create pull request
        if: (steps.figure-out-branch.outputs.SKIP == 0) && (steps.apply-patch.outputs.UPDATE_NEEDED == 1)
        uses: peter-evans/create-pull-request@v4
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          base: ${{ steps.figure-out-branch.outputs.BRANCH }}
          branch: ${{ steps.apply-patch.outputs.BRANCH_NAME }}
          author: Flatcar Buildbot <buildbot@flatcar-linux.org>
          committer: Flatcar Buildbot <buildbot@flatcar-linux.org>
          title: Upgrade Linux Kernel for ${{ steps.figure-out-branch.outputs.BRANCH }} from ${{ steps.apply-patch.outputs.VERSION_OLD }} to ${{ steps.fetch-latest-release.outputs.KERNEL_VERSION }}
          body: Subject says it all.
          labels: ${{ steps.figure-out-branch.outputs.LABEL }}