name: Packages

on:
  push:
    branches:
    - master
    paths:
    - 'packages/**'
  pull_request:
    paths:
    - 'packages/**'

jobs:
  build:
    runs-on: ubuntu-latest
    env:
      ANDROID_HOME: "/opt/termux/android-sdk"
      NDK: "/opt/termux/android-ndk"
    strategy:
      matrix:
        target_arch: [aarch64, arm, i686, x86_64]
    steps:
    - name: Clone repository
      uses: actions/checkout@v2
      with:
        fetch-depth: 1000
    - name: Free additional disk space on host
      run: |
        sudo apt purge -yq $(dpkg -l | grep '^ii' | awk '{ print $2 }' | grep -P '(cabal-|dotnet-|ghc-|libmono|php)') \
          liblldb-6.0 libllvm6.0:amd64 mono-runtime-common monodoc-manual powershell ruby
        sudo apt autoremove -yq
        sudo rm -rf /usr/local
    - name: Build
      run: |
        BASE_COMMIT=$(jq --raw-output .pull_request.base.sha "$GITHUB_EVENT_PATH")
        OLD_COMMIT=$(jq --raw-output .commits[0].id "$GITHUB_EVENT_PATH")
        HEAD_COMMIT=$(jq --raw-output .commits[-1].id "$GITHUB_EVENT_PATH")
        if [ "$BASE_COMMIT" = "null" ]; then
          if [ "$OLD_COMMIT" = "$HEAD_COMMIT" ]; then
            # Single-commit push.
            echo "Processing commit: ${HEAD_COMMIT}"
            CHANGED_FILES=$(git diff-tree --no-commit-id --name-only -r "${HEAD_COMMIT}")
          else
            # Multi-commit push.
            OLD_COMMIT="${OLD_COMMIT}~1"
            echo "Processing commit range: ${OLD_COMMIT}..${HEAD_COMMIT}"
            CHANGED_FILES=$(git diff-tree --no-commit-id --name-only -r "${OLD_COMMIT}" "${HEAD_COMMIT}")
          fi
        else
          # Pull requests.
          echo "Processing pull request #$(jq --raw-output .pull_request.number "$GITHUB_EVENT_PATH"): ${BASE_COMMIT}..HEAD"
          CHANGED_FILES=$(git diff-tree --no-commit-id --name-only -r "${BASE_COMMIT}" "HEAD")
        fi
        mkdir -p ./artifacts ./debs
        touch ./debs/.placeholder
        # Process tag '%ci:no-build' that may be added as line to commit message.
        # Forces CI to cancel current build with status 'passed'.
        if grep -qiP '^\s*%ci:no-build\s*$' <(git log --format="%B" -n 1 "HEAD"); then
          tar cf artifacts/debs-${{ matrix.target_arch }}.tar debs
          echo "[!] Force exiting as tag '%ci:no-build' was applied to HEAD commit message."
          exit 0
        fi
        # Build local Docker image if setup scripts were changed.
        # Useful for pull requests submitting changes for both build environment and packages.
        if grep -qP '^scripts/(Dockerfile|setup-ubuntu\.sh)$' <<< "$CHANGED_FILES"; then
          echo "Detected changes for environment setup scripts. Building custom Docker image now."
          cd ./scripts
          docker build -t termux/package-builder:latest .
          cd ..
        fi
        # Remove duplicates and deleted packages from $PACKAGE_NAMES.
        # Write names of deleted packages to a list that will be passed to upload job for
        # further processing.
        PACKAGE_NAMES=$(sed -nE 's@^packages/([^/]*)/([^/]*)(/.*)?$@\1@p' <<< "$CHANGED_FILES" | sort | uniq)
        for pkg in $PACKAGE_NAMES; do
          if [ ! -d "./packages/${pkg}" ]; then
            PACKAGE_NAMES=$(sed -E "s/(^|\s\s*)${pkg}(\$|\s\s*)/ /g" <<< "$PACKAGE_NAMES")
            echo "$pkg" >> ./deleted_packages.txt
          fi
        done
        # Remove trailing spaces.
        PACKAGE_NAMES=$(sed 's/[[:blank:]]*$//' <<< "$PACKAGE_NAMES")
        # Process added or updated packages. Create a list of packages for further processing
        # in upload job.
        if [ -n "$PACKAGE_NAMES" ]; then
          ./scripts/lint-packages.sh $(echo "$PACKAGE_NAMES" | grep -P '^[a-zA-Z0-9]' | awk '{ print "./packages/"$0"/build.sh" }')
          ./scripts/run-docker.sh env TERMUX_TOPDIR=/home/builder/termux-packages/.termux-builder ./build-package.sh -a ${{ matrix.target_arch }} -I ${PACKAGE_NAMES}
          echo "${PACKAGE_NAMES}" > ./built_packages.txt
        fi
        # Put package lists into directory with *.deb files so they will be transferred to
        # upload job.
        test -f ./built_packages.txt && mv ./built_packages.txt ./debs/
        test -f ./deleted_packages.txt && mv ./deleted_packages.txt ./debs/
        # Files containing certain symbols (e.g. ":") will cause failure in actions/upload-artifact.
        # Archiving *.deb files in a tarball to avoid issues with uploading.
        tar cf artifacts/debs-${{ matrix.target_arch }}-${{ github.sha }}.tar debs
    - name: Checksums for built *.deb files
      run: |
        find debs -type f -name "*.deb" -exec sha256sum "{}" \; | sort -k2
    - name: Store *.deb files
      uses: actions/upload-artifact@v2
      with:
        name: termux-packages-${{ github.sha }}
        path: ./artifacts
  upload:
    if: github.event_name != 'pull_request'
    needs: build
    runs-on: ubuntu-latest
    steps:
    - name: Clone repository
      uses: actions/checkout@v2
    - name: Get *.deb files
      uses: actions/download-artifact@v2
      with:
        name: termux-packages-${{ github.sha }}
        path: ./
    - name: Setup ssh key and known_hosts
      env:
        SSH_AUTH_SOCK: /tmp/ssh_agent.sock
      run: |
        mkdir -p ~/.ssh
        echo "${{ secrets.KNOWN_HOST_ENTRY }}" >> ~/.ssh/known_hosts
        ssh-agent -a $SSH_AUTH_SOCK
        ssh-add - <<< "${{ secrets.SSHKEY }}"
    - name: Upload to grimler.se
      env:
        SSH_AUTH_SOCK: /tmp/ssh_agent.sock
      run: |
        # Zip the deb archives to only do one transfer to the repo.
        # This makes it easier to parse it, we can run one update job
        # instead of one for each arch on the server.
        archive="termux-packages-${{ github.sha }}.zip"
        zip $archive debs-*-${{ github.sha }}.tar
        sftp -P ${{ secrets.PORT }} ${{ secrets.USER }}@grimler.se <<EOF
          put $archive /debs/
        EOF