build-kernel.yml

name: Build kernel
on:
  push:
    branches: [main]
    tags:
      - linux-wsl-*
      - linux-msft-wsl-*
  schedule:
    - cron: "30 17 * * *"
  workflow_dispatch:
jobs:
  build-kernel:
    runs-on: ubuntu-latest
    permissions:
      contents: write
      pull-requests: write
    steps:
      - name: Checkout
        uses: actions/checkout@v3.6.0
      - name: Check Kernel Version
        id: get_version
        run: |
          if [[ "$EVENT_NAME" == "push" ]]; then
            if [[ "$REF_TYPE" == "tag" ]]; then
              MSFT_KERNEL_VER=${GITHUB_REF##*/}
              MSFT_KERNEL_INFO=$(curl -sX GET "https://api.github.com/repos/microsoft/WSL2-Linux-Kernel/releases")
              MSFT_KERNEL_URL=$(echo "${MSFT_KERNEL_INFO}" | jq -r ".[] | select(.tag_name == \"$MSFT_KERNEL_VER\").tarball_url")
              MSFT_KERNEL_BODY=$(echo "${MSFT_KERNEL_INFO}" | jq -r ".[] | select(.tag_name == \"$MSFT_KERNEL_VER\").body")
              echo -e "## Features\n${MSFT_KERNEL_BODY}" >/tmp/bodyfile.txt
              sed -i "s|\(^[[:space:]]\+KERNEL_URL=\).*|\1${MSFT_KERNEL_URL}|g" build-kernel.sh
              echo "MSFT_KERNEL_VER=$MSFT_KERNEL_VER" >> $GITHUB_OUTPUT
            fi
          else
            REPO_KERNEL_INFO=$(curl -sX GET "https://api.github.com/repos/${{ github.repository }}/releases")
            REPO_MSFT_KERNEL_VER=$(echo "${REPO_KERNEL_INFO}" | jq -r '[.[] | select(.prerelease == false)][0] | .tag_name')
            REPO_KERNEL_VER=$(echo "${REPO_KERNEL_INFO}" | jq -r '[.[] | select(.prerelease == true)][0] | .tag_name')
            MSFT_KERNEL_INFO=$(curl -sX GET "https://api.github.com/repos/microsoft/WSL2-Linux-Kernel/releases/latest")
            MSFT_KERNEL_VER=$(echo "${MSFT_KERNEL_INFO}" | jq -r '.tag_name')
            KERNEL_INFO=$(curl --silent https://www.kernel.org | sed -n '/<td id="latest_link">/,/<\/td>/p')
            KERNEL_VER=linux-wsl-$(echo "${KERNEL_INFO}" | grep -Pom1 '(?<=>)([[:digit:]]{1,3}\.){1,2}[[:digit:]]{1,3}')
            if [ "$KERNEL_VER" != "$REPO_KERNEL_VER" ]; then
              KERNEL_URL=$(echo "${KERNEL_INFO}" | grep -Po 'http[^"]+')
              sed -i "s|\(^[[:space:]]\+KERNEL_URL=\).*|\1${KERNEL_URL}|g" build-kernel.sh
              echo "MSFT_KERNEL_VER=$KERNEL_VER" >> $GITHUB_OUTPUT
              echo "IS_PRERELEASE=true" >> $GITHUB_OUTPUT
            elif [ "$MSFT_KERNEL_VER" != "$REPO_MSFT_KERNEL_VER" ]; then
              MSFT_KERNEL_URL=$(echo "${MSFT_KERNEL_INFO}" | jq -r '.tarball_url')
              MSFT_KERNEL_BODY=$(echo "${MSFT_KERNEL_INFO}" | jq -r '.body')
              echo -e "## Features\n${MSFT_KERNEL_BODY}" >/tmp/bodyfile.txt
              sed -i "s|\(^[[:space:]]\+KERNEL_URL=\).*|\1${MSFT_KERNEL_URL}|g" build-kernel.sh
              echo "MSFT_KERNEL_VER=$MSFT_KERNEL_VER" >> $GITHUB_OUTPUT
            fi
          fi
        env:
          EVENT_NAME: ${{ github.event_name }}
          REF_TYPE: ${{ github.ref_type }}
      - name: Create Pull Request
        if: ${{ steps.get_version.outputs.MSFT_KERNEL_VER }}
        id: cpr
        uses: peter-evans/create-pull-request@v5.0.2
        with:
          add-paths: build-kernel.sh
          base: main
          commit-message: Update ${{ steps.get_version.outputs.MSFT_KERNEL_VER }}
          author: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
          branch: release/${{ steps.get_version.outputs.MSFT_KERNEL_VER }}
          delete-branch: true
          title: Update ${{ steps.get_version.outputs.MSFT_KERNEL_VER }}
          body: This PR will be merged automatically.
      - name: Merge for Dependabot PRs
        if: ${{ steps.get_version.outputs.MSFT_KERNEL_VER && steps.cpr.outputs.pull-request-url }}
        run: gh pr merge $PR_URL --auto --delete-branch --squash
        env:
          PR_URL: ${{ steps.cpr.outputs.pull-request-url }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      - name: Build Release
        if: ${{ steps.get_version.outputs.MSFT_KERNEL_VER || github.event_name == 'push' }}
        timeout-minutes: 100
        run: |
          git pull
          docker compose up
          docker compose down
          tee -a /tmp/bodyfile.txt <<-EOF
          ## sha256sum
          \`\`\`
          $(cat *.sha256)
          \`\`\`
          EOF
      - name: GH Release
        if: ${{ steps.get_version.outputs.MSFT_KERNEL_VER }}
        uses: softprops/action-gh-release@v1
        with:
          body_path: /tmp/bodyfile.txt
          prerelease: ${{ steps.get_version.outputs.IS_PRERELEASE == 'true' }}
          files: |
            wsl2-kernel-amd64
            wsl2-kernel-arm64
          tag_name: ${{ steps.get_version.outputs.MSFT_KERNEL_VER }}
          fail_on_unmatched_files: true
      - name: Prune old releases
        if: ${{ steps.get_version.outputs.MSFT_KERNEL_VER }}
        run: |
          git fetch --tags
          LINUX_TAGS=$(git tag --sort=committerdate -l "linux-wsl-*" | head -n-2)
          for TAG in ${LINUX_TAGS[@]}; do
            gh release delete ${TAG} --yes
            git tag -d ${TAG}
          done
          MSFT_TAGS=$(git tag --sort=committerdate -l "linux-msft-wsl-*" | head -n-3)
          for TAG in ${MSFT_TAGS[@]}; do
            gh release delete ${TAG} --yes
            git tag -d ${TAG}
          done
          git push --tags --prune
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      - name: Rclone Sync
        if: ${{ steps.get_version.outputs.IS_PRERELEASE }}
        run: |
          mkdir -p .config/rclone
          tee -a .config/rclone/rclone.conf >/dev/null <<-EOF
          ${{ secrets.RCLONE_CONFIG }}
          EOF
          docker run --rm --volume ${PWD}/.config:/config --volume ${PWD}/wsl2-kernel-amd64:/data/wsl2-kernel-amd64 rclone/rclone copy /data/wsl2-kernel-amd64 drive:/devtools/wslkernel/
          docker run --rm --volume ${PWD}/.config:/config --volume ${PWD}/wsl2-kernel-arm64:/data/wsl2-kernel-arm64 rclone/rclone copy /data/wsl2-kernel-arm64 drive:/devtools/wslkernel/
          rm -rf .config/rclone