build-release.yml

name: Build and release gem to RubyGems

on:
  push:
    tags:
      - v*

jobs:
  release:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
        with:
          fetch-depth: 0 # Fetch current tag as annotated. See https://github.com/actions/checkout/issues/290
      - uses: ruby/setup-ruby@v1
        with:
          ruby-version: 2.7
      - name: "Extract data from tag: version, message, body"
        id: tag
        run: |
          git fetch --tags --force # Really fetch annotated tag. See https://github.com/actions/checkout/issues/290#issuecomment-680260080
          echo ::set-output name=version::${GITHUB_REF#refs/tags/v}
          echo ::set-output name=subject::$(git for-each-ref $GITHUB_REF --format='%(contents:subject)')
          BODY="$(git for-each-ref $GITHUB_REF --format='%(contents:body)')"
          # Extract changelog entries between this and previous version headers
          escaped_version=$(echo ${GITHUB_REF#refs/tags/v} | sed -e 's/[]\/$*.^[]/\\&/g')
          changelog=$(awk "BEGIN{inrelease=0} /## ${escaped_version}/{inrelease=1;next} /## [0-9]+\.[0-9]+\.[0-9]+/{inrelease=0;exit} {if (inrelease) print}" CHANGELOG.md)
          # Multiline body for release. See https://github.community/t/set-output-truncates-multiline-strings/16852/5
          BODY="${BODY}"$'\n'"${changelog}"
          BODY="${BODY//'%'/'%25'}"
          BODY="${BODY//$'\n'/'%0A'}"
          BODY="${BODY//$'\r'/'%0D'}"
          echo "::set-output name=body::$BODY"
          # Add pre-release option if tag name has any suffix after vMAJOR.MINOR.PATCH
          if [[ ${GITHUB_REF#refs/tags/} =~ ^v[0-9]+\.[0-9]+\.[0-9]+.+ ]]; then
            echo ::set-output name=prerelease::true
          fi
      - name: Build gem
        run: gem build
      - name: Calculate checksums
        run: sha256sum yabeda-prometheus-mmap-${{ steps.tag.outputs.version }}.gem > SHA256SUM
      - name: Check version
        run: ls -l yabeda-prometheus-mmap-${{ steps.tag.outputs.version }}.gem
      - name: Create Release
        id: create_release
        uses: actions/create-release@v1
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          tag_name: ${{ github.ref }}
          release_name: ${{ steps.tag.outputs.subject }}
          body: ${{ steps.tag.outputs.body }}
          draft: false
          prerelease: ${{ steps.tag.outputs.prerelease }}
      - name: Upload built gem as release asset
        uses: actions/upload-release-asset@v1
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          upload_url: ${{ steps.create_release.outputs.upload_url }}
          asset_path: yabeda-prometheus-mmap-${{ steps.tag.outputs.version }}.gem
          asset_name: yabeda-prometheus-mmap-${{ steps.tag.outputs.version }}.gem
          asset_content_type: application/x-tar
      - name: Upload checksums as release asset
        uses: actions/upload-release-asset@v1
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          upload_url: ${{ steps.create_release.outputs.upload_url }}
          asset_path: SHA256SUM
          asset_name: SHA256SUM
          asset_content_type: text/plain
      - name: Publish to GitHub packages
        env:
          GEM_HOST_API_KEY: Bearer ${{ secrets.GITHUB_TOKEN }}
        run: |
          gem push yabeda-prometheus-mmap-${{ steps.tag.outputs.version }}.gem --host https://rubygems.pkg.github.com/${{ github.repository_owner }}
      - name: Publish to RubyGems
        env:
          GEM_HOST_API_KEY: "${{ secrets.RUBYGEMS_API_KEY }}"
        run: |
          gem push yabeda-prometheus-mmap-${{ steps.tag.outputs.version }}.gem