merge-upstream.yml

name: Merge upstream recipes

on:
  workflow_dispatch:
  schedule:
    - cron: '0 8 * * 5'

jobs:
  pr:
    runs-on: ubuntu-latest

    strategy:
      matrix:
        base_ref:
          - akirak
        upstream:
          - 'https://github.com/melpa/melpa.git'
        upstream_branch:
          - 'master'

    steps:

    - uses: actions/checkout@v3
      with:
        fetch-depth: 0
        sparse-checkout: '.'
        ref: ${{ matrix.base_ref }}

    - name: Switch to a work branch
      id: start
      run: |
        echo "rev=$(git rev-parse HEAD)" >> "$GITHUB_OUTPUT"

    - name: Install git-filter-repo
      run: |
        sudo apt-get update && sudo apt-get install git-filter-repo --yes

    - name: Fetch the upstream
      run: |
        git remote add upstream ${{ matrix.upstream }}
        git fetch upstream ${{ matrix.upstream_branch }}

    - name: Configure the Git identity
      run: |
        # Set some identity. Actually it will be overridden later by git-filter-repo,
        # so it can be anything
        git config --add user.name 'github-actions[bot]'
        git config --add user.email '6270544+github-actions[bot]@users.noreply.github.com'

    - name: Retrieve the merge base
      id: merge-base
      run: |
        rev=$(git merge-base upstream/${{ matrix.upstream_branch }} ${{ matrix.base_ref }})
        echo "rev=$rev" > "$GITHUB_OUTPUT"

    - name: Filter commits
      run: |
        git switch -C upstream-recipes upstream/${{ matrix.upstream_branch }}
        git-filter-repo \
          --path recipes/ --refs "${{ steps.merge-base.outputs.rev }}..HEAD" \
          --commit-callback '
            commit.committer_name = commit.author_name
            commit.committer_email = commit.author_email
            commit.committer_date = commit.author_date
          ' --force

    - name: Cherry-pick the filtered commits
      run: |
        git switch ${{ matrix.base_ref }}
        git cherry-pick --strategy ort -X theirs ..upstream-recipes

    - name: Create a pull request
      uses: peter-evans/create-pull-request@v5
      with:
        branch: create-pull-request/recipes
        token: ${{ secrets.PAT_FOR_PR }}
        title: 'Merge upstream recipe commits'
        labels: automation