.github/workflows/labeler-trigger.yml

# Copyright 2013 The Flutter Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# Unprivileged half of the pull request labeler.
#
# This workflow runs on `pull_request` with a read-only token and no access to
# secrets. It records the pull request number in a `labeler-metadata` artifact
# so that the privileged `labeler.yml` workflow can apply labels via
# `workflow_run`. The labels themselves are computed in `labeler.yml` from the
# trusted `.github/labeler.yml` on the default branch.

name: Pull Request Labeler Trigger

on:
  pull_request:
    types: [opened, synchronize, reopened]

permissions:
  contents: read

jobs:
  record:
    name: Record PR for labeling
    runs-on: ubuntu-latest
    if: ${{ github.repository == 'flutter/flutter' }}
    steps:
      - name: Record PR number
        env:
          PR_NUMBER: ${{ github.event.pull_request.number }}
        run: |
          mkdir -p labeler-metadata
          jq -n --arg pr "$PR_NUMBER" '{pr_number: $pr}' > labeler-metadata/metadata.json

      - name: Upload labeler metadata
        uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
        with:
          name: labeler-metadata
          path: labeler-metadata/
          retention-days: 1
          if-no-files-found: error