name: Lockfile

on:
  pull_request:
concurrency:
  group: "${{ github.workflow }}-${{ github.head_ref || github.ref }}"
  cancel-in-progress: true

permissions:
  contents: read

jobs:
  verify-pnpm-lock:
    name: No manual pnpm-lock.yaml edits
    runs-on: ubuntu-latest
    steps:
      - name: ⬇️ Check out PR HEAD
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
        with:
          fetch-depth: 0

      - name: ⬇️ Fetch base branch
        env:
          BASE_REF: ${{ github.base_ref }}
        run: git fetch origin $BASE_REF --depth=1

      - name: 📦 Setup pnpm and Node
        uses: pnpm/setup@84cb39b217b10273981911c288cd62326dc7c6d2 # v2.0.2
        with:
          install: false

      - name: ⏪ Reset pnpm-lock.yaml to base
        env:
          BASE_REF: ${{ github.base_ref }}
        run: git show "origin/$BASE_REF:pnpm-lock.yaml" > pnpm-lock.yaml

      - name: 📦 pnpm install
        # Fine to skip scripts since we don't run any code
        run: pnpm clean && pnpm install --ignore-scripts --no-frozen-lockfile

      - name: 🔍 Verify pnpm-lock.yaml
        run: |
          git diff --quiet --exit-code || {
            echo '::error::`pnpm-lock.yaml` does not match what pnpm would generate given the base `pnpm-lock.yaml` and the head `package.json`.'
            echo '::error:: - If this is intentional, you can ignore this check.'
            echo '::error:: - If this is unintentional, apply the following diff:'
            git --no-pager diff
            exit 1
          }