pr-labeler.yaml

# Copyright 2026 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.

name: Pull request labeler
run-name: >-
  Label pull request ${{github.event.pull_request.number}} by ${{github.actor}}

# This workflow is designed NOT to fail if labeling actions encounter errors;
# instead, it notes errors as annotations on the workflow's run summary page. If
# labels don't seem to be getting applied, check there for errors.

on:
  # Note: do not copy-paste this workflow with `pull_request_target` left as-is.
  # Its use here is a special case where security implications are understood.
  # Workflows should normally use `pull_request` instead.
  pull_request_target:
    types:
      - opened
      - synchronize

  # Allow manual invocation.
  workflow_dispatch:
    inputs:
      pr-number:
        description: 'The PR number of the PR to label:'
        type: string
        required: true
      debug:
        description: 'Run with debugging options'
        type: boolean
        default: true

# Declare default workflow permissions as read only.
permissions: read-all

jobs:
  label-pr-size:
    if: github.repository_owner == 'quantumlib'
    name: Update PR size labels
    runs-on: ubuntu-slim
    timeout-minutes: 5
    permissions:
      contents: read
      issues: write
      pull-requests: write
    env:
      # Environment variable PR_NUMBER is needed by size-labeler.sh.
      PR_NUMBER: ${{inputs.pr-number || github.event.pull_request.number}}
      # Add xtrace to SHELLOPTS for all Bash scripts when doing debug runs.
      SHELLOPTS: ${{inputs.debug && 'xtrace' || '' }}
    steps:
      - name: Check out a copy of the git repository
        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
        with:
          sparse-checkout: |
            ./dev_tools/ci/size-labeler.sh

      - name: Label the PR with a size label
        continue-on-error: true
        env:
          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
        run: ./dev_tools/ci/size-labeler.sh