# Copyright 2019 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.

# Sets submodule state to the one specified in SUBMODULE_VERSIONS

name: Synchronize Submodules

on:
  push:
    branches:
      - master
      # This branch doesn't exist yet, but may as part of shifting to a
      # GitHub-first workflow.
      - google

jobs:
  synchronize:
    runs-on: ubuntu-18.04
    steps:
      - name: Checking out repository
        uses: actions/checkout@v2
        with:
          token: ${{ secrets.GITHUB_WRITE_ACCESS_TOKEN }}
      - name: Initializing submodules
        run: ./scripts/git/submodule_versions.py init
      - name: Checking submodule state
        run: |
          echo "::set-env name=has_diff::false"
          git diff --cached --exit-code || echo "::set-env name=has_diff::true"
      - name: Committing updates
        if: env.has_diff == 'true'
        run: |
          git config --local user.email "noreply+action@github.com"
          git config --local user.name "Submodule Synchronize Action"
          git commit -am "Synchronize submodules"
      - name: Pushing changes
        if: env.has_diff == 'true'
        uses: ad-m/github-push-action@v0.5.0
        with:
          github_token: ${{ secrets.GITHUB_WRITE_ACCESS_TOKEN }}
          branch: ${{ github.ref }}