Build-Kernels.yml

name: Build Kernels

on:
  schedule:
    - cron: '52 */3 * * *'
  workflow_dispatch:
    inputs:
      debug_enabled:
        description: 'Debug session enabled'
        required: false
        default: false
        type: boolean
      release:
        description: 'Delivery Channel'
        required: false
        default: 'Artifact'
        type: choice
        options:
          - "Artifact"
          - "Release"    

jobs:
  ## CONFIG ##############################################################################
  job-config:
    runs-on: ubuntu-latest
    outputs:
      matrix: ${{ steps.set-matrix.outputs.matrix }}
      cancel: ${{ steps.prebuild-checks.outputs.cancel }}
    defaults:
      run:
        shell: bash
    steps:
    - name: "✔️ Pre-build checks"
      id: prebuild-checks
      run: |
        body="/home/runner/body.txt"
        jsonFile="/home/runner/kernels.json"
        WSL_DATE="$( wget -qO- https://api.github.com/repos/microsoft/WSL2-Linux-Kernel/commits | jq '.[1].commit.committer.date' -r )"
        LAST_DATE="$( wget -qO- https://api.github.com/repos/$GITHUB_REPOSITORY/releases/latest | jq .published_at -r )" || LAST_DATE="2000.01.01T00:00:00Z"
        echo "The last WSL2 Kernel commit date is:  $WSL_DATE"
        echo "The last Release in this repo was on: $LAST_DATE"
        if [[ $WSL_DATE > $LAST_DATE ]]; then
            echo "NEW KERNEL SOURCE!!!!"
            echo "# KERNEL UPDATES" > $body
            echo >> $body
            wget -qO- https://api.github.com/repos/microsoft/WSL2-Linux-Kernel/releases/latest | jq .body -r >> $body
        fi
        if [[ "$GITHUB_EVENT_NAME" == "workflow_dispatch" ]]; then
            echo "NEW IMPROVEMENT!!!!"
            [ -f $body ] && echo >> $body
            echo "# IMPROVEMENTS" >> $body
            echo >> $body
        fi
        if [ -f $body ]; then
            echo "{}" | jq "\
              .commitDate |= \"${WSL_DATE}\" |\
              .buildDate |= \"$(TZ=UTC date +'%Y.%m.%dT%H:%M:%SZ')\"" > $jsonFile
            echo "cancel=false" >> $GITHUB_OUTPUT
        else
            echo "NOTHING NEW. CANCELLING ACTION..."
            echo "cancel=true"  >> $GITHUB_OUTPUT
        fi

    - name: "⏬ Download repository"
      if: steps.prebuild-checks.outputs.cancel != 'true'
      uses: actions/checkout@v3

    - name: "⏬ Fetch latest WSL kernel source"
      if: steps.prebuild-checks.outputs.cancel != 'true'
      run: git clone --depth=1 https://github.com/microsoft/WSL2-Linux-Kernel.git src
      # latest rolling release:  git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
      # Microsoft config file:  https://github.com/microsoft/WSL2-Linux-Kernel/raw/linux-msft-wsl-5.15.y/Microsoft/config-wsl

    - name: "🪄 Prepare Build jobs"
      id: set-matrix
      if: steps.prebuild-checks.outputs.cancel != 'true'
      shell: pwsh
      run: |
        jq ".version |= \`"$(cd src;make kernelversion;cd ..)\`"" ~/kernels.json | set-content kernels.json
        7z a metadata.7z ~/body.txt kernels.json
        $m=@{include = @()}
        (gci *.dif).baseName | % { $m.include+=@{config = $_} } 
        "matrix=$(($m | ConvertTo-Json -compress) -replace '"','`"')" >> $env:GITHUB_OUTPUT

    - name: "💾 Save metadata"
      if: steps.prebuild-checks.outputs.cancel != 'true'
      uses: actions/cache@v3.3.1
      id: cache-metadata
      with:
        key: ${{ github.sha }}-metadata
        path: ./metadata.7z

    - name: "💾 Save Build Folder"
      if: steps.prebuild-checks.outputs.cancel != 'true'
      uses: actions/cache@v3.3.1
      id: cache-sources
      with:
        path: ./*
        key: ${{ github.sha }}-repo

  ## BUILD ##############################################################################
  job-build:
    needs: [ job-config ]
    if: needs.job-config.outputs.cancel != 'true'
    name: "Build configuration ${{ matrix.config }}"
    runs-on: ubuntu-latest
    strategy:
      matrix: ${{ FromJson(needs.job-config.outputs.matrix) }}
        # config: ${{ FromJson(needs.job-config.outputs.configs) }}
      fail-fast: false
    defaults:
      run:
        shell: bash
    steps:
    - name: "⏬ Download and Install Toolchain"
      run: sudo apt -y install build-essential flex bison dwarves libssl-dev libelf-dev python3 bc jq aria2 p7zip-full

    - name: "📂 Load Build Folder"
      uses: actions/cache@v3.3.1
      id: cache-sources
      with:
        path: ./*
        key: ${{ github.sha }}-repo

    - name: "⚙️ Build WSL2 Kernel with ${{ matrix.config }} configuration for Windows 64 bits"
      run: |
        ##   NOTE: dif file generated after `makeconfig nconfig` with instruction:
        #    diff -u Microsoft/config-wsl .config | grep "^[+-][^+^-].*" > ../<CONFIG>.dif
        difFile="$(pwd)/${{ matrix.config }}.dif"
        cd src
          sed "s/-standard-/-${{ matrix.config }}-/" Microsoft/config-wsl > .config
          while read line; do 
            case ${line:0:1} in
              +)  echo "adding  : ${line:1}"
                  echo ${line:1} >> .config ;;
              -)  echo "removing: ${line:1}"
                  sed -i "/${line:1}/d" .config ;;
            esac
          done < $difFile
          yes '' | make -j$(($(nproc)*2+1)) LOCALVERSION="" || true
          cp arch/x86/boot/bzImage ../WSL2kernel_${{ matrix.config }}
          # echo "${{ matrix.config }}" > ../WSL2kernel_${{ matrix.config }}

    - name: "👍 Upload Image as Artifact"
      uses: actions/upload-artifact@v3
      with:
        name: ${{ matrix.config }}
        path: |
          WSL2kernel_${{ matrix.config }}
          src/.config

  ## PUBLISH ##############################################################################
  job-publish:
    if: needs.job-config.outputs.cancel != 'true'
    needs:
    - job-config
    - job-build
    name: "Publish"
    runs-on: ubuntu-latest
    defaults:
      run:
        shell: bash
    steps:
    - name: "⏬ Download repository"
      uses: actions/checkout@v3

    - name: "📬 Receive Images from Build Jobs"
      uses: actions/download-artifact@v3
      with:
        path: ./artifacts

    - name: "📬 Receive metadata"
      uses: actions/cache@v3.3.1
      id: cache-metadata
      with:
        key: ${{ github.sha }}-metadata
        path: ./metadata.7z

    - name: "🚮 Recycle Cache"
      uses: snnaplab/delete-branch-cache-action@v1

    - name: "🚮 Recycle Artifacts"
      uses: geekyeggo/delete-artifact@v2
      with:
          name: '*'

    - name: "📦 Create Package"
      run: |
        7z e metadata.7z
        APP_VERSION=$(cat wsl2kernel.ps1 |  grep -Po "(?<=\sv)[\d\.\-]+")
        KERNEL_VERSION=$(jq .version -r kernels.json)
        BUILD_VERSION="${KERNEL_VERSION}-${APP_VERSION}"
        echo "BUILD_VERSION=${BUILD_VERSION}" >> $GITHUB_ENV
        ls -1 *.dif | sed "s|\..*||g" | while read c; do
          cp "artifacts/${c}/WSL2kernel_${c}" "WSL2kernel_${c}_${KERNEL_VERSION}"
          description=$(head -1 "${c}.dif" | sed "s|\r||")
          json=$(jq ".kernels |= . + [{ \"config\": \"${c}\",
            \"description\": \"${description}\" }]" kernels.json)
          echo $json > kernels.json
        done
        7z a -aoa -tzip -- "WSL2kernel_${BUILD_VERSION}.zip" \
          *.ps1  \
          WSL2k*  \
          LICENSE  \
          README.md \
          kernels.json
        7z l "WSL2kernel_${BUILD_VERSION}.zip"

    - name: "👍 Upload Artifact"
      uses: actions/upload-artifact@v3
      if: env.CANCEL != 'true' && github.event.inputs.release == 'Artifact'
      with:
        name: ${{ env.BUILD_VERSION }}
        path: |
          *zip
          body.txt
          artifacts/*/src/.config

    - name: "🎉 Publish a new release"
      uses: softprops/action-gh-release@v0.1.15
      # WARNING: before useing this action go to https://github.com/OWNER/REPO/settings/actions
      # and in **Workflow Permissions** section give actions **Read and Write permissions**.
      if: github.event_name != 'workflow_dispatch' || github.event.inputs.release == 'Release'
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      with:
        tag_name: ${{ env.BUILD_VERSION }}
        body_path: body.txt
        files: |
          WSL2kernel_*

    # - name: "🔧 Prepare debug session"
    #   if: github.event.inputs.debug_enabled == 'true'
    #   run: |
    #     ## install zsh
    #     sudo apt install zsh zsh-syntax-highlighting

    #     ## oh-my-posh
    #     sudo wget https://github.com/JanDeDobbeleer/oh-my-posh/releases/latest/download/posh-linux-amd64 -O /usr/local/bin/oh-my-posh
    #     sudo chmod +x /usr/local/bin/oh-my-posh

    #     ## setting rc files
    #     echo "eval \"\$(oh-my-posh init \$(oh-my-posh get shell))\"" >> ~/.bashrc
    #     echo "eval \"\$(oh-my-posh init \$(oh-my-posh get shell))\"" >> ~/.zshrc

    #     ## Default profiles
    #     wget -q https://github.com/okibcn/miniU/raw/main/Github_Linux/.nanorc -O  ~/.nanorc
    #     wget -q https://github.com/okibcn/miniU/raw/main/Github_Linux/profile.sh -O  ~/profile.sh
    #     cp /etc/bash.bashrc ~
    #     cat ~/profile.sh >> ~/bash.bashrc
    #     sudo cp ~/bash.bashrc /etc/bash.bashrc -f
    #     cp ~/profile.sh ~/.zshrc


    # - name: "🐞 Debug session"
    #   uses: mxschmitt/action-tmate@v3
    #   if: github.event.inputs.debug_enabled == 'true'
    #   env:
    #     GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
    #     ## More info at https://til.simonwillison.net/github-actions/debug-tmate
    #     ##           or https://github.com/mxschmitt/action-tmate