python-wheel.yml

name: Build and Publish Python Wheels for Caterva2

on:
  push:
    branches:
      - main  # Rebuild wheels on every commit to main

permissions:
  contents: write  # Needed for GITHUB_TOKEN to push

jobs:
  build_wheels:
    runs-on: ubuntu-latest
    env:
      PYTHON_VERSION: 3.12

    steps:
      # Checkout the repository
      - uses: actions/checkout@v3

      # Set up Python
      - name: Set up Python
        uses: actions/setup-python@v3
        with:
          python-version: ${{ env.PYTHON_VERSION }}

      # Install build dependencies
      - name: Install build dependencies
        run: |
          python -m pip install --upgrade pip
          pip install build

      # Build the wheel(s)
      - name: Build the package
        run: python -m build

      # upload artifact for debugging
      - name: Upload built wheels (optional)
        uses: actions/upload-artifact@v4
        with:
          name: wheels
          path: ./dist/*.whl

      # Publish wheels to orphan `wheels` branch
      - name: Publish wheels to wheels branch
        if: github.repository == 'ironArray/Caterva2'   # Only push from main repo
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |

          # Abort if no wheels were built
          if [ -z "$(ls -A ./dist/*.whl 2>/dev/null)" ]; then
            echo "No wheels found, skipping push"
            exit 0
          fi

          # Prepare fresh working directory for orphan branch
          rm -rf wheels-branch
          mkdir wheels-branch
          cd wheels-branch

          # Initialize git repo and authenticate
          git init
          git remote add origin https://x-access-token:${GITHUB_TOKEN}@github.com/${{ github.repository }}.git
          git fetch origin wheels || true

          # Create orphan branch (separate history)
          git checkout --orphan wheels
          git reset --hard

          # Copy wheels from main repo build output
          mkdir -p wheels
          cp ../dist/*.whl wheels/
          echo "Wheels to publish:"
          ls -lh wheels/

          # Generate latest.txt (name of newest wheel)
          latest_wheel=$(ls -1 wheels/*.whl | sort | tail -n 1)
          echo "$(basename $latest_wheel)" > wheels/latest.txt
          echo "Latest wheel: $(cat wheels/latest.txt)"

          # Commit and push
          git config user.name "GitHub Actions"
          git config user.email "actions@github.com"
          git add wheels
          git commit -m "Update wheels for commit ${{ github.sha }}"
          git push origin wheels --force