changelog_release.yaml

name: Auto Release on Changelog Update

on:
  push:
    branches: [ main ]
    paths:
      - 'CHANGELOG.md'

jobs:
  prepare-release:
    name: Extract version & check tag
    runs-on: ubuntu-latest
    outputs:
      version: ${{ steps.extract.outputs.version }}
      should_release: ${{ steps.tagcheck.outputs.should_release }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0  # need tags

      - name: Extract version from CHANGELOG.md
        id: extract
        run: |
          second_h2_line=$(grep -E '^## \[' CHANGELOG.md | sed -n '2p') || true
          if [ -z "$second_h2_line" ]; then
            echo "Could not find second H2 header in CHANGELOG.md" >&2
            exit 1
          fi
          # Support optional prerelease (-rc.1, -beta, etc) and build metadata (+build.5) per SemVer, no leading 'v'.
          version=$(echo "$second_h2_line" | sed -E 's/^## \[([0-9]+\.[0-9]+\.[0-9]+(-[0-9A-Za-z.-]+)?(\+[0-9A-Za-z.-]+)?)\].*/\1/')
          if ! [[ $version =~ ^[0-9]+\.[0-9]+\.[0-9]+(-[0-9A-Za-z.-]+)?(\+[0-9A-Za-z.-]+)?$ ]]; then
            echo "Parsed version '$version' is not a valid SEMVER" >&2
            exit 1
          fi
          echo "version=$version" >> "$GITHUB_OUTPUT"
          echo "Extracted version: $version"

      - name: Check if tag already exists
        id: tagcheck
        run: |
          version_tag="v${{ steps.extract.outputs.version }}"
          if git ls-remote --exit-code --tags origin "$version_tag" >/dev/null 2>&1; then
            echo "Tag $version_tag already exists. Skipping release." >&2
            echo "should_release=false" >> "$GITHUB_OUTPUT"
          else
            echo "Tag $version_tag does not exist. Will release." >&2
            echo "should_release=true" >> "$GITHUB_OUTPUT"
          fi
      - name: Emit skip notice
        if: steps.tagcheck.outputs.should_release == 'false'
        run: |
          echo "::notice title=Release skipped::Tag v${{ steps.extract.outputs.version }} already exists. No release will be created." 

  run-release:
    name: Run Release workflow
    needs: prepare-release
    if: needs.prepare-release.outputs.should_release == 'true'
    permissions:
      id-token: write
      contents: write
    uses: ./.github/workflows/update_sdk_version.yaml
    with:
      version: ${{ needs.prepare-release.outputs.version }}
      emergency: false
    secrets: inherit

  no-release:
    name: No release (tag exists)
    needs: prepare-release
    if: needs.prepare-release.outputs.should_release == 'false'
    runs-on: ubuntu-latest
    steps:
      - name: Summary
        run: |
          echo "Tag v${{ needs.prepare-release.outputs.version }} already exists. Release workflow not invoked." >> $GITHUB_STEP_SUMMARY