pr-labeler.yml

name: PR labeler

on:
  push:
    branches: [main]
    paths:
      - .github/workflows/pr-labeler.yml
      - apps/bare-expo/**
      - apps/test-suite/**
      - packages/**
      - yarn.lock
      # Adding new paths should also update the following "Get the base commit" step's paths
  pull_request:
    types: [opened, synchronize]
    paths:
      - .github/workflows/pr-labeler.yml
      - apps/bare-expo/**
      - apps/test-suite/**
      - packages/**
      - yarn.lock

concurrency:
  group: ${{ github.workflow }}-${{ github.event_name }}-${{ github.ref }}
  cancel-in-progress: true

jobs:
  test-suite-fingerprint:
    runs-on: ubuntu-22.04
    if: ${{ github.event.pull_request.head.repo.full_name == github.repository || github.event_name == 'push' }}
    # REQUIRED: limit concurrency when pushing main(default) branch to prevent conflict for this action to update its fingerprint database
    concurrency: fingerprint-${{ github.event_name != 'pull_request' && 'main' || github.run_id }}
    permissions:
      # REQUIRED: Allow comments of PRs
      pull-requests: write
      # REQUIRED: Allow updating fingerprint in acton caches
      actions: write
    steps:
      - name: 👀 Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 100
      - name: ⬇️ Fetch commits from base branch
        run: git fetch origin main:main --depth 100
        if: github.event_name == 'pull_request'
      - name: ⬢ Setup Node
        uses: actions/setup-node@v4
        with:
          node-version: 18
      - name: ♻️ Restore caches
        uses: ./.github/actions/expo-caches
        id: expo-caches
        with:
          yarn-workspace: 'true'
      - name: 🧶 Install node modules in root dir
        if: steps.expo-caches.outputs.yarn-workspace-hit != 'true'
        run: yarn install --frozen-lockfile
      - name: Get the base commit
        id: base-commit
        run: |
          # Since we limit this pr-labeler workflow only triggered from limited paths, we should use custom base commit
          echo base-commit=$(git log -n 1 main --pretty=format:'%H' -- .github/workflows/pr-labeler.yml apps/bare-expo apps/test-suite packages yarn.lock) >> "$GITHUB_OUTPUT"
      - name: 📷 Check fingerprint
        id: fingerprint
        uses: expo/expo-github-action/fingerprint@main
        with:
          working-directory: apps/bare-expo
          previous-git-commit: ${{ steps.base-commit.outputs.base-commit }}

      - name: 👀 Debug fingerprint
        run: |
          echo "previousGitCommit=${{ steps.fingerprint.outputs.previous-git-commit }} currentGitCommit=${{ steps.fingerprint.outputs.current-git-commit }}"
          echo "isPreviousFingerprintEmpty=${{ steps.fingerprint.outputs.previous-fingerprint == '' }}"

      - name: 🏷️ Labeling PR
        uses: actions/github-script@v6
        if: ${{ github.event_name == 'pull_request' && steps.fingerprint.outputs.fingerprint-diff == '[]' }}
        with:
          script: |
            try {
              await github.rest.issues.removeLabel({
                issue_number: context.issue.number,
                owner: context.repo.owner,
                repo: context.repo.repo,
                name: ['bot: fingerprint changed']
              })
            } catch (e) {
              if (e.status != 404) {
                throw e;
              }
            }
            github.rest.issues.addLabels({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              labels: ['bot: fingerprint compatible']
            })
      - name: 🏷️ Labeling PR
        uses: actions/github-script@v6
        if: ${{ github.event_name == 'pull_request' && steps.fingerprint.outputs.fingerprint-diff != '[]' }}
        with:
          script: |
            try {
              await github.rest.issues.removeLabel({
                issue_number: context.issue.number,
                owner: context.repo.owner,
                repo: context.repo.repo,
                name: ['bot: fingerprint compatible']
              })
            } catch (e) {
              if (e.status != 404) {
                throw e;
              }
            }
            github.rest.issues.addLabels({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              labels: ['bot: fingerprint changed']
            })

      - name: 🔍 Find old comment if it exists
        uses: peter-evans/find-comment@v2
        if: ${{ github.event_name == 'pull_request' }}
        id: old_comment
        with:
          issue-number: ${{ github.event.pull_request.number }}
          comment-author: 'expo-bot'
          body-includes: <!-- pr-labeler comment -->
      - name: 💬 Add comment with fingerprint
        if: ${{ github.event_name == 'pull_request' && steps.fingerprint.outputs.fingerprint-diff != '[]' && steps.old_comment.outputs.comment-id == '' }}
        uses: actions/github-script@v6
        with:
          github-token: ${{ secrets.EXPO_BOT_GITHUB_TOKEN }}
          script: |
            const diff = JSON.stringify(${{ steps.fingerprint.outputs.fingerprint-diff}}, null, 2);
            const body = `<!-- pr-labeler comment -->
            The Pull Request introduced fingerprint changes against the base commit: ${{ steps.fingerprint.outputs.previous-git-commit }}
            <details><summary>Fingerprint diff</summary>

            \`\`\`json
            ${diff}
            \`\`\`

            </details>

            ---
            *Generated by [PR labeler](https://github.com/expo/expo/actions/workflows/pr-labeler.yml) 🤖*
            `;

            github.rest.issues.createComment({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: body,
            });
      - name: 💬 Update comment with fingerprint
        if: ${{ github.event_name == 'pull_request' && steps.fingerprint.outputs.fingerprint-diff != '[]' && steps.old_comment.outputs.comment-id != '' }}
        uses: actions/github-script@v6
        with:
          github-token: ${{ secrets.EXPO_BOT_GITHUB_TOKEN }}
          script: |
            const diff = JSON.stringify(${{ steps.fingerprint.outputs.fingerprint-diff}}, null, 2);
            const body = `<!-- pr-labeler comment -->
            The Pull Request introduced fingerprint changes against the base commit: ${{ steps.fingerprint.outputs.previous-git-commit }}
            <details><summary>Fingerprint diff</summary>

            \`\`\`json
            ${diff}
            \`\`\`

            </details>

            ---
            *Generated by [PR labeler](https://github.com/expo/expo/actions/workflows/pr-labeler.yml) 🤖*
            `;

            github.rest.issues.updateComment({
              issue_number: context.issue.number,
              comment_id: '${{ steps.old_comment.outputs.comment-id }}',
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: body,
            });
      - name: 💬 Delete comment with fingerprint
        if: ${{ github.event_name == 'pull_request' && steps.fingerprint.outputs.fingerprint-diff == '[]' && steps.old_comment.outputs.comment-id != '' }}
        uses: actions/github-script@v6
        with:
          github-token: ${{ secrets.EXPO_BOT_GITHUB_TOKEN }}
          script: |
            github.rest.issues.deleteComment({
              issue_number: context.issue.number,
              comment_id: '${{ steps.old_comment.outputs.comment-id }}',
              owner: context.repo.owner,
              repo: context.repo.repo,
            });