prepare-release.yml

# Manual workflow: create and push a release tag from main.
# Prerequisites: Cargo.toml and charts/diffscope/Chart.yaml appVersion must already
# be bumped and merged to main. Then run this workflow with the same version.
# This pushes the tag and triggers the Release workflow (builds, release notes, assets).
name: Prepare release

on:
  workflow_dispatch:
    inputs:
      version:
        description: 'Release version (e.g. 0.5.28)'
        required: true
        type: string

permissions:
  contents: write

jobs:
  tag-and-push:
    name: Tag and push
    runs-on: ubuntu-latest
    steps:
      - name: Checkout main
        uses: actions/checkout@v5
        with:
          ref: main
          fetch-depth: 0

      - name: Normalize version input
        id: version
        run: |
          v="${{ inputs.version }}"
          v="${v#v}"
          echo "version=$v" >> "$GITHUB_OUTPUT"
          echo "tag=v$v" >> "$GITHUB_OUTPUT"

      - name: Verify Cargo.toml version matches
        run: python3 .github/scripts/check_version_sync.py --tag "v${{ steps.version.outputs.version }}"

      - name: Verify Chart appVersion matches
        run: |
          chart_version=$(python3 -c "
          import re
          from pathlib import Path
          c = Path('charts/diffscope/Chart.yaml').read_text()
          m = re.search(r\"\"\"appVersion:\s*['\"]?(.*?)['\"]?\s*$\"\"\", c, re.MULTILINE)
          print(m.group(1).strip()) if m else exit(1)
          ")
          expected="${{ steps.version.outputs.version }}"
          if [ "$chart_version" != "$expected" ]; then
            echo "Chart appVersion ($chart_version) does not match input ($expected). Bump charts/diffscope/Chart.yaml and merge to main first."
            exit 1
          fi

      - name: Create and push tag
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          tag="${{ steps.version.outputs.tag }}"
          if git rev-parse "$tag" >/dev/null 2>&1; then
            echo "Tag $tag already exists."
            exit 1
          fi
          git tag -a "$tag" -m "Release $tag"
          git push origin "$tag"