# 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 if it is tagged with the Copybara tag to use the
# submodule state specified in SUBMODULE_VERSIONS.txt and merge from the
# specified commit.
# WARNING: rewrites history!

name: Fixup Copybara

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

env:
  COPYBARA_TAG: "COPYBARA_INTEGRATE_REVIEW"
  UPSTREAM_REMOTE: origin

jobs:
  fixup:
    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: Setting git config
        run: |
          git config --local user.email "iree-github-actions-bot@google.com"
          git config --local user.name "Copybara Fixup Action"
      - name: Running fixer script
        run: |
          ./scripts/git/fix_copybara_export.sh
      - name: Checking for a change
        run: |
          echo "commit_amended=false" >> $GITHUB_ENV
          if [[ "$(git rev-parse HEAD)" != "${GITHUB_SHA?}" ]]; then
            echo "commit_amended=true" >> $GITHUB_ENV
          fi
      - name: Pushing changes
        if: env.commit_amended == 'true'
        run: git push -f origin ${{ github.ref }}

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

  check_copybara_tag:
    runs-on: ubuntu-18.04
    steps:
      - name: Checking out repository
        uses: actions/checkout@v2
      - name: Checking for Copybara tag
        run: |
          if git log --format=%B -n 1 HEAD | grep -q "${COPYBARA_TAG}"; then
            echo "Commit contains Copybara tag"
            exit 1
          fi