.github/workflows/synchronize_submodules.yml

# 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.

# Edits the HEAD commit to use the submodule state specified in SUBMODULE_VERSIONS.txt
# WARNING: rewrites history!

name: Synchronize Submodules

on:
  push:
    branches:
      # Do not add this to human branches like main. It rewrites history!
      - google

jobs:
  synchronize:
    runs-on: ubuntu-18.04
    steps:
      - name: Checking out repository
        uses: actions/checkout@v2
        with:
          token: ${{ secrets.GITHUB_WRITE_ACCESS_TOKEN }}
          # Get all history. We're force-pushing here and will otherwise drop
          # all the branch history. This takes a whopping 2 seconds. I think
          # we'll live.
          fetch-depth: 0
      - name: Importing submodules from SUBMODULE_VERSIONS.txt
        run: ./scripts/git/submodule_versions.py import
      - name: Checking submodule state
        run: |
          echo "has_diff=false" >> $GITHUB_ENV
          git diff --cached --exit-code || echo "has_diff=true" >> $GITHUB_ENV
      - name: Committing updates
        if: env.has_diff == 'true'
        run: |
          git config --local user.email "iree-github-actions-bot@google.com"
          git config --local user.name "Submodule Synchronize Action"
          git commit --amend -a --no-edit
      - name: Pushing changes
        if: env.has_diff == 'true'
        run: git push -f origin ${{ github.ref }}

  check:
    runs-on: ubuntu-18.04
    steps:
      - name: Checking out repository
        uses: actions/checkout@v2
      - name: Checking submodules
        run: ./scripts/git/submodule_versions.py check