release.yaml

# The way this works is a little weird. But basically, the create-release job
# runs purely to initialize the GitHub release itself. Once done, the upload
# URL of the release is saved as an artifact.
#
# The build-release job runs only once create-release is finished. It gets
# the release upload URL by downloading the corresponding artifact (which was
# uploaded by create-release). It then builds the release executables for each
# supported platform and attaches them as release assets to the previously
# created release.
#
# The key here is that we create the release only once.

name: release
on:
  push:
    # Enable when testing release infrastructure on a branch.
    # branches:
    # - add-ci
    tags:
    - '[0-9]+.[0-9]+.[0-9]+'
jobs:
  create-release:
    name: create-release
    runs-on: ubuntu-latest
    # env:
      # Set to force version number, e.g., when no tag exists.
      # FRE_VERSION: TEST-0.0.0
    steps:
      - name: Create artifacts directory
        run: mkdir artifacts

      - name: Get the release version from the tag
        if: env.FRE_VERSION == ''
        run: |
          # See: https://github.community/t5/GitHub-Actions/How-to-get-just-the-tag-name/m-p/32167/highlight/true#M1027
          echo "FRE_VERSION=${GITHUB_REF#refs/tags/}" >> $GITHUB_ENV
          echo "version is: ${{ env.FRE_VERSION }}"

      - name: Create GitHub release
        id: release
        uses: actions/create-release@v1
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          tag_name: ${{ env.FRE_VERSION }}
          release_name: ${{ env.FRE_VERSION }}

      - name: Save release upload URL to artifact
        run: echo "${{ steps.release.outputs.upload_url }}" > artifacts/release-upload-url

      - name: Save version number to artifact
        run: echo "${{ env.FRE_VERSION }}" > artifacts/release-version

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

  build-release:
    name: build-release
    needs: ['create-release']
    runs-on: ${{ matrix.os }}
    env:
      TARGET_DIR: ./target
      RUST_BACKTRACE: 1
    strategy:
      matrix:
        build: [linux-musl, linux-gnu, macos]
        include:
        - build: linux-musl
          os: ubuntu-latest
          rust: nightly
          target: x86_64-unknown-linux-musl
        - build: linux-gnu
          os: ubuntu-latest
          rust: nightly
          target: x86_64-unknown-linux-gnu
        - build: macos
          os: macos-latest
          rust: nightly
          target: x86_64-apple-darwin

    steps:
    - name: Checkout repository
      uses: actions/checkout@v2
      with:
        fetch-depth: 1

    - name: Install Rust
      uses: actions-rs/toolchain@v1
      with:
        toolchain: ${{ matrix.rust }}
        profile: minimal
        override: true
        target: ${{ matrix.target }}

    - name: Use set target flags
      run: |
        echo "TARGET_FLAGS=--target ${{ matrix.target }}" >> $GITHUB_ENV
        echo "TARGET_DIR=./target/${{ matrix.target }}" >> $GITHUB_ENV

    - name: Show command used for Cargo
      run: |
        echo "target flag is: ${{ env.TARGET_FLAGS }}"
        echo "target dir is: ${{ env.TARGET_DIR }}"

    - name: Get release download URL
      uses: actions/download-artifact@v1
      with:
        name: artifacts
        path: artifacts

    - name: Set release upload URL and release version
      shell: bash
      run: |
        release_upload_url="$(cat artifacts/release-upload-url)"
        echo "RELEASE_UPLOAD_URL=$release_upload_url" >> $GITHUB_ENV
        echo "release upload url: $RELEASE_UPLOAD_URL"
        release_version="$(cat artifacts/release-version)"
        echo "RELEASE_VERSION=$release_version" >> $GITHUB_ENV
        echo "release version: $RELEASE_VERSION"

    - name: Build release binary
      run: cargo build --verbose --release ${{ env.TARGET_FLAGS }}

    - name: Strip release binary
      run: strip "target/${{ matrix.target }}/release/fre"

    - name: Upload release archive
      uses: actions/upload-release-asset@v1.0.1
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      with:
        upload_url: ${{ env.RELEASE_UPLOAD_URL }}
        asset_path: target/${{ matrix.target }}/release/fre
        asset_name: fre-${{ matrix.target }}
        asset_content_type: application/octet-stream