on:
  push:
    tags:
      - 'debian-*'

name: Debian

env:
  GPG_KEY_ID: 56C464BAAC421453
  KERNEL_VERSION: 5.4.13
  KDEB_PKGVERSION: 5.4.13-2
  LOCALVERSION: -surface

jobs:
  build:
    name: Build Kernel
    runs-on: ubuntu-latest
    container: debian:sid
    steps:
    - name: Checkout code
      uses: actions/checkout@v2

    - name: Install build dependencies
      run: |
        sed 's/^deb /deb-src /' /etc/apt/sources.list >> /etc/apt/sources.list
        apt-get -y update
        apt-get -y install build-essential fakeroot rsync git wget python3-debian dpkg-sig lz4 sbsigntool
        apt-get -y build-dep linux

    - name: Prepare kernel source
      run: |
        cd pkg/debian

        # get ubuntu build patches (for config)
        SOURCE_URL="https://kernel.ubuntu.com/~kernel-ppa/mainline/v$KERNEL_VERSION"
        SOURCE_LIST="$SOURCE_URL/SOURCES"

        mkdir -p "ubuntu"
        wget "$SOURCE_LIST" -O "ubuntu/SOURCES"
        SOURCE_FILES="$(tail -n +2 "ubuntu/SOURCES")"

        for f in $SOURCE_FILES; do
          wget "$SOURCE_URL/$f" -O "ubuntu/$f"
        done

        # download kernel sources
        wget https://cdn.kernel.org/pub/linux/kernel/v${KERNEL_VERSION%%.*}.x/linux-$KERNEL_VERSION.tar.xz
        tar xf linux-$KERNEL_VERSION.tar.xz

        mv linux-$KERNEL_VERSION linux && cd linux

        # apply ubuntu build patches
        for PATCH in ../ubuntu/*.patch; do
          patch -p1 < ${PATCH}
        done

        # apply surface build patches
        for PATCH in ../*.patch; do
          patch -p1 < ${PATCH}
        done

        # apply surface patches
        for PATCH in ../../../patches/${KERNEL_VERSION%.*}/*.patch; do
          patch -p1 < ${PATCH}
        done

    - name: Configure
      run: |
        cd pkg/debian/linux

        # merge configs
        ./scripts/kconfig/merge_config.sh                     \
          debian.master/config/config.common.ubuntu           \
          debian.master/config/amd64/config.common.amd64      \
          debian.master/config/amd64/config.flavour.generic   \
          ../ubuntu.config                                    \
          ../surface.config

    - name: Setup secureboot certificate
      env:
        SB_KEY: ${{ secrets.SURFACE_SB_KEY }}
      run: |
        cd pkg

        mkdir -p debian/linux/keys

        # unlock/copy key and certificate
        echo "$SB_KEY" | base64 -d > debian/linux/keys/MOK.key
        cp keys/surface.crt debian/linux/keys/MOK.crt

    - name: Build
      run: |
        cd pkg/debian/linux
        make bindeb-pkg -j2

    - name: Prepare release
      run: |
        mkdir release
        mv pkg/debian/*.deb release

    - name: Sign packages
      env:
        GPG_KEY: ${{ secrets.SURFACE_GPG_KEY }}
      run: |
        # import GPG key
        echo "$GPG_KEY" | base64 -d | gpg --import --no-tty --batch --yes
        export GPG_TTY=$(tty)

        # sign package
        dpkg-sig -g "--batch --no-tty" --sign builder -k $GPG_KEY_ID release/*.deb

    - name: Upload artifacts
      uses: actions/upload-artifact@v1
      with:
        name: debian-latest
        path: release

  repo:
    name: Update package repository
    needs: [build]
    runs-on: ubuntu-latest
    container: debian:sid
    steps:
    - name: Install dependencies
      run: |
        apt-get update
        apt-get install -y reprepro git

    - name: Checkout repository
      uses: actions/checkout@v2
      with:
        repository: linux-surface/repo
        token: ${{ secrets.GITHUB_BOT_TOKEN }}
        fetch-depth: 0
        ref: master

    - name: Download artifacts
      uses: actions/download-artifact@v1
      with:
        name: debian-latest

    - name: Update repository
      env:
        GPG_KEY: ${{ secrets.SURFACE_GPG_KEY }}
        GIT_REF: ${{ github.ref }}
      run: |
        cd debian

        # Import the GPG key for signing the repository
        echo "$GPG_KEY" | base64 -d | gpg --import --no-tty --batch --yes

        # Add packages to repository
        for pkg in ../debian-latest/*.deb; do
          reprepro --basedir . --component main includedeb release $pkg
        done
        rm -r ../debian-latest

        # Parse git tag from ref
        GIT_TAG=$(echo $GIT_REF | sed 's|^refs/tags/||g')

        # Convert packages into references
        for pkg in $(find . -name '*.deb'); do
          echo "$GIT_TAG/$(basename $pkg)" > $pkg.blob
          rm $pkg
        done

    - name: Commit and push
      uses: github-actions-x/commit@v2.3
      with:
        github-token: ${{ secrets.GITHUB_BOT_TOKEN }}
        push-branch: master
        commit-message: Update debian kernel
        force-add: false
        rebase: true
        files: debian/*
        name: surfacebot
        email: surfacebot@users.noreply.github.com

  release:
    name: Publish release
    needs: [repo]
    runs-on: ubuntu-latest
    steps:
    - name: Download artifacts
      uses: actions/download-artifact@v1
      with:
        name: debian-latest

    - name: Upload assets
      uses: svenstaro/upload-release-action@v1-release
      with:
        repo_token: ${{ secrets.GITHUB_BOT_TOKEN }}
        file: ./*-latest/*
        tag: ${{ github.ref }}
        overwrite: true
        file_glob: true