release-drafter.yml

name: Release Drafter

on:
  push:
    branches:
      - main
      - 'v*'

permissions:
  contents: read

jobs:
  update_release_draft:
    permissions:
      # write permission is required to create a github release
      contents: write
      # write permission is required for autolabeler
      # otherwise, read permission is required at least
      pull-requests: write
    runs-on: ubuntu-latest
    steps:
      # Drafts your next Release notes as Pull Requests are merged into "main" or "v*" branches
      - name: Compute next patch version for major branch
        id: next_version
        if: ${{ startsWith(github.ref, 'refs/heads/v') }}
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        shell: bash
        run: |
          set -euo pipefail
          major="${GITHUB_REF_NAME#v}"
          last="$(gh release list --repo "${GITHUB_REPOSITORY}" --exclude-drafts --json tagName --jq '.[].tagName' \
            | grep -E "^v${major}\\.[0-9]+\\.[0-9]+$" \
            | sort -V \
            | tail -n 1 || true)"

          if [ -z "${last}" ]; then
            echo "No previous v${major}.*.* releases found; cannot compute next patch version." >&2
            exit 1
          fi

          ver="${last#v}"
          IFS='.' read -r maj min patch <<< "${ver}"
          next_patch=$((patch + 1))
          echo "version=${maj}.${min}.${next_patch}" >> "$GITHUB_OUTPUT"

      - uses: release-drafter/release-drafter@v6
        id: release_drafter
        if: ${{ startsWith(github.ref, 'refs/heads/v') }}
        # (Optional) specify config name to use, relative to .github/. Default: release-drafter.yml
        with:
          config-name: release-drafter-template.yml
          commitish: refs/heads/${{ github.ref_name }}
          version: ${{ steps.next_version.outputs.version }}
        #   disable-autolabeler: true
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - uses: release-drafter/release-drafter@v6
        id: release_drafter_main
        if: ${{ github.ref == 'refs/heads/main' }}
        # (Optional) specify config name to use, relative to .github/. Default: release-drafter.yml
        with:
          config-name: release-drafter-template.yml
          commitish: refs/heads/${{ github.ref_name }}
        #   disable-autolabeler: true
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Validate drafted version matches major branch
        if: ${{ startsWith(github.ref, 'refs/heads/v') }}
        shell: bash
        run: |
          set -euo pipefail
          branch_major="${GITHUB_REF_NAME#v}"
          drafted_major='${{ steps.release_drafter.outputs.major_version }}'
          if [ -z "${drafted_major}" ]; then
            echo "release-drafter did not output major_version" >&2
            exit 1
          fi
          if [ "${drafted_major}" != "${branch_major}" ]; then
            echo "Drafted release major v${drafted_major} does not match branch ${GITHUB_REF_NAME}." >&2
            echo "Ensure the branch has an initial v${branch_major}.x.y release and that PR labels don't request a major bump." >&2
            exit 1
          fi