release-tag.yml

name: Move Floating Version Tag

on:
  release:
    types: [published]
  push:
    branches: [master, main]

jobs:
  move-tag:
    runs-on: ubuntu-latest
    name: Move floating version tag
    permissions:
      contents: write
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Move floating major tag
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"

          if [ "${{ github.event_name }}" = "release" ]; then
            # Triggered by a release — move the tag for that release version
            VERSION="${{ github.event.release.tag_name }}"
            MAJOR=$(echo "$VERSION" | sed 's/^v//' | cut -d. -f1)
            FLOATING_TAG="v${MAJOR}"
            TARGET_SHA="${{ github.sha }}"

            echo "Release: $VERSION"
            echo "Moving $FLOATING_TAG → $VERSION ($TARGET_SHA)"

            git tag -d "$FLOATING_TAG" 2>/dev/null || true
            git push origin ":refs/tags/$FLOATING_TAG" 2>/dev/null || true
            git tag "$FLOATING_TAG" "$TARGET_SHA"
            git push origin "$FLOATING_TAG"

            echo "✅ $FLOATING_TAG now points to $VERSION"

          else
            # Triggered by a push to master — bootstrap any missing floating tags
            # Find the latest release tag and create vN if it doesn't exist yet
            LATEST_TAG=$(git tag --sort=-version:refname | grep -E '^[0-9]+\.[0-9]+\.[0-9]+$' | head -1)

            if [ -z "$LATEST_TAG" ]; then
              echo "No release tags found, skipping"
              exit 0
            fi

            MAJOR=$(echo "$LATEST_TAG" | cut -d. -f1)
            FLOATING_TAG="v${MAJOR}"

            if git ls-remote --tags origin "$FLOATING_TAG" | grep -q "$FLOATING_TAG"; then
              echo "✅ $FLOATING_TAG already exists, nothing to do"
            else
              TAG_SHA=$(git rev-list -n 1 "$LATEST_TAG")
              echo "Bootstrapping $FLOATING_TAG → $LATEST_TAG ($TAG_SHA)"
              git tag "$FLOATING_TAG" "$TAG_SHA"
              git push origin "$FLOATING_TAG"
              echo "✅ $FLOATING_TAG created pointing at $LATEST_TAG"
            fi
          fi