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

jobs:
  get-kernel-release:
    strategy:
      matrix:
        channel: [main,alpha,beta,stable,lts,lts-old]
      fail-fast: false
    runs-on: ubuntu-latest
    steps:
      - name: Check out main scripts branch for GitHub workflow scripts only
        uses: actions/checkout@v4
        with:
          token: ${{ secrets.BOT_PR_TOKEN }}
          path: gha
          ref: main
      - name: Figure out branch
        id: figure-out-branch
        run: gha/.github/workflows/figure-out-branch.sh '${{ matrix.channel }}'
      - name: Check out work scripts branch for updating
        if: steps.figure-out-branch.outputs.SKIP == 0
        uses: actions/checkout@v4
        with:
          token: ${{ secrets.BOT_PR_TOKEN }}
          path: work
          ref: ${{ steps.figure-out-branch.outputs.BRANCH }}
      - name: Figure out latest Linux release version
        if: steps.figure-out-branch.outputs.SKIP == 0
        id: kernel-latest-release
        env:
          GHA_SCRIPTS_DIR: "${{ github.workspace }}/gha"
          WORK_SCRIPTS_DIR: "${{ github.workspace }}/work"
        run: gha/.github/workflows/kernel-current-major-version.sh
      - name: Set up Flatcar SDK
        if: steps.figure-out-branch.outputs.SKIP == 0
        id: setup-flatcar-sdk
        env:
          WORK_SCRIPTS_DIR: "${{ github.workspace }}/work"
          CHANNEL: ${{ steps.figure-out-branch.outputs.LABEL }}
          # This will be empty for the main channel, but we handle
          # this case inside setup-flatcar-sdk.sh.
          MIRROR_LINK: ${{ steps.figure-out-branch.outputs.LINK }}
        run: gha/.github/workflows/setup-flatcar-sdk.sh
      - name: Apply patch
        if: steps.figure-out-branch.outputs.SKIP == 0
        id: apply-patch
        env:
          GHA_SCRIPTS_DIR: "${{ github.workspace }}/gha"
          WORK_SCRIPTS_DIR: "${{ github.workspace }}/work"
          VERSION_NEW: ${{ steps.kernel-latest-release.outputs.KERNEL_VERSION }}
          PACKAGES_CONTAINER: ${{ steps.setup-flatcar-sdk.outputs.PACKAGES_CONTAINER }}
          SDK_NAME: ${{ steps.setup-flatcar-sdk.outputs.SDK_NAME }}
          TARGET_BRANCH: ${{ steps.figure-out-branch.outputs.BRANCH }}
        run: gha/.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@v6
        with:
          token: ${{ secrets.BOT_PR_TOKEN }}
          path: work
          branch: "linux-${{ steps.kernel-latest-release.outputs.KERNEL_VERSION }}-${{ steps.figure-out-branch.outputs.BRANCH }}"
          base: ${{ steps.figure-out-branch.outputs.BRANCH }}
          title: Upgrade Linux Kernel for ${{ steps.figure-out-branch.outputs.BRANCH }} from ${{ steps.apply-patch.outputs.VERSION_OLD }} to ${{ steps.kernel-latest-release.outputs.KERNEL_VERSION }}
          body: Subject says it all.
          labels: ${{ steps.figure-out-branch.outputs.LABEL }}
          signoff: true