.github/workflows/kokoro_labeler.yml

# Copyright 2020 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Trigger Kokoro runs on PRs coming from upstream changes.
#
# This is achieved by labeling them with "kokoro:run".
#
# For security, Kokoro does not run automatically on all PRs (since that
# would grant RCE), but it does run automatically on PRs from collaborators
# and Google organization members. Unfortunately, GitHub apps appear to be
# impossible to register as either.
#
# The labeler action requires a GITHUB_TOKEN with write access to the
# repository. PRs from forks run within the fork and only receive a token
# with read access (for security reasons). Thus the label step would fail.
# The entire job is conditioned on the PR author being the copybara app, so
# it simply shouldn't run on these other PRs.

name: Kokoro Labeler

on: [pull_request]

jobs:
  label_pr:
    if: github.actor == 'copybara-service[bot]'
    runs-on: ubuntu-18.04
    steps:
      - name: Adding label
        uses: actions/labeler@v2
        with:
          repo-token: "${{ secrets.GITHUB_TOKEN }}"