label-sync.yml

name: Label sync

on:
  push:
    branches: [main, master]
    paths:
      - ".github/labels.yml"
      - ".github/workflows/label-sync.yml"
  workflow_dispatch:

permissions: {}

concurrency:
  group: label-sync
  cancel-in-progress: true

jobs:
  sync:
    name: Sync repository labels
    runs-on: ubuntu-latest
    timeout-minutes: 5
    permissions:
      contents: read
      issues: write
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
        with:
          persist-credentials: false

      - name: Create or update labels
        env:
          GH_TOKEN: ${{ github.token }}
        shell: bash
        run: |
          set -euo pipefail
          while IFS=$'\t' read -r name color description; do
            encoded_name="$(jq -rn --arg value "$name" '$value | @uri')"
            if gh api --silent "repos/$GITHUB_REPOSITORY/labels/$encoded_name"; then
              gh api --silent --method PATCH "repos/$GITHUB_REPOSITORY/labels/$encoded_name" \
                -f new_name="$name" \
                -f color="$color" \
                -f description="$description"
            else
              gh api --silent --method POST "repos/$GITHUB_REPOSITORY/labels" \
                -f name="$name" \
                -f color="$color" \
                -f description="$description"
            fi
          done < <(
            ruby -ryaml -e '
              YAML.safe_load_file(".github/labels.yml").each do |label|
                values = %w[name color description].map { |key| label.fetch(key).to_s }
                abort "label fields must be single-line values" if values.any? { |value| value.include?("\t") || value.include?("\n") }
                puts values.join("\t")
              end
            '
          )