build.yml

name: Build
on:
  - push
  - pull_request

jobs:
  natives-linux-windows:
    name: Linux (x86/ARM/PPC) and Windows native library compilation
    runs-on: ubuntu-18.04

    defaults:
      run:
        working-directory: src/main/c

    steps:
      - name: Checkout the target branch
        uses: actions/checkout@v2
      - name: Setup Java
        uses: actions/setup-java@v1
        with:
          java-version: 8
      - name: Install build prerequisites
        run: |
          sudo apt update
          sudo make crosstools

      - name: Build the Linux and Windows native libraries
        run: |
          make clean-linux clean-windows
          make linux windows

      # The names of the artifacts containing native libraries correspond
      # exactly to the directories inside `src/main/c/resources/native`. That
      # way, the Java build job can pull down all artifacts and unpack them
      # into that directory to overwrite the versions in-repo. This is sadly
      # necessary because the actions/download-artifact@v2 action flattens
      # paths inside artifacts. If it retained full relative paths, we could
      # put Linux and Windows natives inside the same artifact, and we could be
      # flexible with the artifact names. But it doesn't, so we can't, and we
      # can't.
      - name: Upload Linux native libraries
        uses: actions/upload-artifact@v2
        with:
          name: linux
          path: src/main/c/resources/native/linux
      - name: Upload Windows native libraries
        uses: actions/upload-artifact@v2
        with:
          name: windows
          path: src/main/c/resources/native/windows

  natives-macos:
    name: macOS native library compilation
    runs-on: macos-10.15

    defaults:
      run:
        working-directory: src/main/c

    steps:
      - name: Checkout the target branch
        uses: actions/checkout@v2
      - name: Setup Java
        uses: actions/setup-java@v1
        with:
          java-version: 8

      - name: Build the macOS native libraries
        run: |
          make clean-osx
          make osx

      - name: Upload macOS native libraries
        uses: actions/upload-artifact@v2
        with:
          name: osx
          path: src/main/c/resources/native/osx/libNRJavaSerial.jnilib

  natives-freebsd:
    name: FreeBSD native library compilation
    runs-on: ubuntu-18.04
    container:
      image: empterdose/freebsd-cross-build:9.3
      env:
        JAVA_HOME: /usr/lib/jvm/default-jvm

    defaults:
      run:
        working-directory: src/main/c

    steps:
      - name: Checkout the target branch
        uses: actions/checkout@v2
      - name: Setup Java
        # This feels extremely dirty, but the only native header we care about
        # is `jni_md.h`, and it is exactly identical between Linux and FreeBSD
        # (at least in OpenJDK 8).
        run: |
          apk add openjdk8
          ln -s $JAVA_HOME/include/linux $JAVA_HOME/include/freebsd

      - name: Build the FreeBSD native libraries
        run: |
          make clean-freebsd
          settarget i386-freebsd9 make freebsd32
          settarget x86_64-freebsd9 make freebsd64

      - name: Upload FreeBSD native libraries
        uses: actions/upload-artifact@v2
        with:
          name: freebsd
          path: src/main/c/resources/native/freebsd

  java:
    name: Java compilation
    runs-on: ubuntu-18.04

    needs:
      - natives-linux-windows
      - natives-macos
      - natives-freebsd

    steps:
      # We use Spotless in “ratchet mode” to incrementally enforce code
      # formatting throughout the project. In order to ensure feature branches
      # don't regress formatting when compared with the master branch, we need
      # to have a local copy of the master branch for comparison.
      - name: Checkout the master branch
        uses: actions/checkout@v2
        with:
          ref: master
      - name: Checkout the target branch
        uses: actions/checkout@v2
      - name: Setup Java
        uses: actions/setup-java@v1
        with:
          java-version: 8

      - name: Download native libraries
        uses: actions/download-artifact@v2
        with:
          path: src/main/c/resources/native

      - name: Build the Java library
        run: ./gradlew build

      - name: Determine commit hash for artifact filename
        id: vars
        run: echo "::set-output name=short-rev::$(git rev-parse --short HEAD)"
      - name: Upload build artifacts
        uses: actions/upload-artifact@v2
        with:
          name: nrjavaserial-${{steps.vars.outputs.short-rev}}
          path: build/libs/*.jar