release.yml

name: Release

# Manual-only.  The branch selector in the GitHub Actions UI picks the
# source ref; the workflow tags + releases from whatever was selected.
on:
  workflow_dispatch:
    inputs:
      prerelease:
        description: Mark the GitHub release as a pre-release
        type: boolean
        default: false

permissions:
  contents: write   # required to push the tag and create the release

jobs:
  release:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
        with:
          fetch-depth: 0

      - name: Read version from control
        id: version
        run: |
          ver=$(awk '/^Version:/ {print $2}' control)
          if [ -z "$ver" ]; then
              echo "control file has no Version field" >&2
              exit 1
          fi
          tag="v$ver"
          echo "version=$ver" >> "$GITHUB_OUTPUT"
          echo "tag=$tag" >> "$GITHUB_OUTPUT"

      - name: Verify tag does not already exist
        run: |
          tag="${{ steps.version.outputs.tag }}"
          if git rev-parse -q --verify "refs/tags/$tag" >/dev/null \
             || git ls-remote --exit-code --tags origin "$tag" >/dev/null 2>&1; then
              echo "tag $tag already exists -- bump Version in control first" >&2
              exit 1
          fi

      - name: Build container image
        run: docker build -t lowerinstall-build -f Containerfile .

      - name: Build .deb package
        run: docker run --rm -v "$PWD:/build:Z" lowerinstall-build

      - name: Locate built package
        id: pkg
        run: |
          deb=$(ls packages/*.deb | head -n1)
          if [ -z "$deb" ]; then
              echo "no .deb produced under packages/" >&2
              exit 1
          fi
          echo "path=$deb" >> "$GITHUB_OUTPUT"

      - name: Create GitHub release
        uses: softprops/action-gh-release@v3
        with:
          tag_name: ${{ steps.version.outputs.tag }}
          name: ${{ steps.version.outputs.tag }}
          target_commitish: ${{ github.sha }}
          prerelease: ${{ inputs.prerelease }}
          generate_release_notes: true
          make_latest: ${{ inputs.prerelease && 'false' || 'true' }}
          files: ${{ steps.pkg.outputs.path }}