# Copyright 2020 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.

# Creates a PR to merge the `google` branch into the `main` branch.

name: google -> main

on:
  schedule:
    # Every 6 hours at 45 minutes past the hour (to be a bit behind the TF submodule update)
    # 00:45, 06:45, 12:45, 18:45 UTC (04:45, 10:45, 16:45, 22:45 PST)
    - cron: '45 */6 * * *'

jobs:
  google_to_main:
    # Don't run this in everyone's forks.
    if: github.repository == 'google/iree'
    runs-on: ubuntu-18.04
    steps:
      - name: Checking out repository
        uses: actions/checkout@v2
        with:
          ref: "google"
      # We have to explicitly fetch the main branch as well
      - name: Fetching Base Branch
        run: git fetch --no-tags --prune --depth=1 origin main
      - name: Checking for a diff
        run: |
          echo "::set-env name=has_diff::false"
          git diff main --exit-code || echo "::set-env name=has_diff::true"
      - name: Calculating PR body
        if: env.has_diff == 'true'
        run: |
          echo "::set-env name=pr_body::$(git log main.. --decorate=no --pretty='format:* %h %<(80,trunc)%s')"
      - name: Initializing submodules
        if: env.has_diff == 'true'
        run: ./scripts/git/submodule_versions.py init
      - name: Creating Pull Request
        if: env.has_diff == 'true'
        uses: peter-evans/create-pull-request@v2
        with:
          # Personal token is required to trigger additional automation (e.g. presubmits).
          token: ${{ secrets.GITHUB_WRITE_ACCESS_TOKEN }}
          commit-message: "Merge google -> main"
          title: "Merge google -> main"
          body: "${{ env.pr_body }}"
          committer: "Integrate Action <iree-github-actions-bot@google.com>"
          # TODO(gcmn): Figure out a way to assign this to someone dynamically.
          reviewers: gmngeoffrey
          branch: "google-to-main"
          base: "main"