integrate_llvm.yml

#  Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
#  See https://llvm.org/LICENSE.txt for license information.
#  SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#  Copyright (c) 2024.

name: Auto Integrate LLVM
on:
  workflow_dispatch:
  schedule:
    # At minute 0 past hour 1. (see https://crontab.guru)
    - cron: '00 01 * * *'

concurrency:
  # A PR number if a pull request and otherwise the commit hash. This cancels
  # queued and in-progress runs for the same PR (presubmit) or commit
  # (postsubmit). The workflow name is prepended to avoid conflicts between
  # different workflows.
  group: ${{ github.workflow }}-${{ github.event.number || github.sha }}
  cancel-in-progress: true

jobs:
  update-dep:

    name: "Integrate LLVM and send PR"

    runs-on: ubuntu-latest

    permissions:
      contents: write
      pull-requests: write

    steps:
      - name: "Check out repository"
        uses: actions/checkout@v4.2.2
        with:
          fetch-depth: 2

      - name: Restore LLVM project cache
        id: llvm-project-restore
        uses: actions/cache/restore@v4
        with:
          path: /tmp/llvm-project
          key: cache-llvm-project

      - name: "Get llvm-project"
        shell: bash
        id: get-llvm-project
        run: |
          
          # https://github.com/actions/cache/issues/1566
          if [ "${{ steps.llvm-project-restore.outputs.cache-hit }}" == "" ]; then
            git clone https://github.com/llvm/llvm-project.git /tmp/llvm-project
          fi
          
          pushd /tmp/llvm-project
          git pull origin main
          echo "LLVM_SHA_SHORT=$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT
          popd

      - name: Save LLVM project cache
        id: llvm-project-save
        uses: actions/cache/save@v4
        with:
          path: /tmp/llvm-project
          key: "cache-llvm-project-${{ format('{0}-{1}', github.ref_name, github.run_number) }}"

      - name: "Make filtered llvm-project"
        id: make-filtered-llvm-project
        shell: bash
        run: |
          
          DEBIAN_FRONTEND=noninteractive sudo apt install -y git-filter-repo
          HERE=$(pwd)
          
          pushd /tmp/llvm-project
          bash $HERE/filter-llvm.sh
          popd

      - name: "Rebase on top of llvm-project"
        shell: bash
        id: rebase-llvm-project
        run: |
          
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git config user.name "github-actions[bot]"
          git pull /tmp/llvm-project main --no-rebase --ff

      - name: Generate token
        uses: actions/create-github-app-token@v1
        id: generate-token
        with:
          app-id: ${{ secrets.BUMP_LLVM_CREATE_PR_APP_ID }}
          private-key: ${{ secrets.BUMP_LLVM_CREATE_PR_APP_PRIVATE_KEY }}

      - name: "Create Pull Request"
        id: cpr
        uses: peter-evans/create-pull-request@v7
        with:
          token: ${{ steps.generate-token.outputs.token }}
          commit-message: "[LLVM] Integrate to ${{ steps.get-llvm-project.outputs.LLVM_SHA_SHORT }}"
          title: "[LLVM] Integrate to ${{ steps.get-llvm-project.outputs.LLVM_SHA_SHORT }}"
          body: "Integrate LLVM to https://github.com/llvm/llvm-project/commit/${{ steps.get-llvm-project.outputs.LLVM_SHA_SHORT }}"
          author: 'github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>'
          base: main
          branch: update-llvm
          delete-branch: true

      - name: Enable auto-merge
        if: steps.cpr.outputs.pull-request-operation == 'created'
        uses: peter-evans/enable-pull-request-automerge@v3
        with:
          token: ${{ steps.generate-token.outputs.token }}
          pull-request-number: ${{ steps.cpr.outputs.pull-request-number }}
          merge-method: rebase

      - name: Auto approve
        if: steps.cpr.outputs.pull-request-operation == 'created'
        run: gh pr review --approve "${{ steps.cpr.outputs.pull-request-number }}"
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}