Open_PR.yml

name: Sync v.next with main

# PRs are completed with squash and merge option - this commit will be cherry-picked for v.next.
on:
  push:
    branches:
      - main

jobs:
  sync_branches:
    runs-on: ubuntu-latest
    steps:
    
      # Clone just the main branch of the samples repo.
      - name: Checkout code
        uses: actions/checkout@v2
        with:
          ref: main
          fetch-depth: 2

      # Cherry-pick the most recent commit from main into v.next.
      - name: Cherry-pick from main into v.next
        env:
          GITHUB_TOKEN: ${{ secrets.BOT_TOKEN }}
        run: |
          # Configure the bot's git identity.
          git config --global user.name "ArcGIS Maps SDK [bot]"
          git config --global user.email "arcgis-maps-sdk-bot@esri.com"
          echo "Configured git identity for bot."

          # Store the commit hash of the most recent commit from main.
          TRIGGER_COMMIT_HASH=$(git rev-parse HEAD)
          echo "Job triggered by commit: $TRIGGER_COMMIT_HASH."

          # Store the commit message.
          COMMIT_MESSAGE=$(gh api repos/Esri/arcgis-maps-sdk-dotnet-samples/commits/$TRIGGER_COMMIT_HASH  | jq -r '.commit.message')
            echo "Commit message:"
            echo "$COMMIT_MESSAGE."

          # If the commit message contains the string "no-branch-sync", don't open a PR.
          if [[ $COMMIT_MESSAGE == *no-branch-sync* ]]; then
            echo "PR author intended the commit to only target main."
            exit 0
          fi

          # Name the target branch for new PR.
          SYNC_BRANCH="sync/$TRIGGER_COMMIT_HASH"

          # Pull v.next and branch off. 
          git fetch --depth=2 origin v.next 
          git switch v.next
          git switch -c $SYNC_BRANCH

          # Attempt to cherry-pick the commit.
          git cherry-pick $TRIGGER_COMMIT_HASH || CANNOT_CHERRY_PICK=$?
          
          # Terminate the job if cherry-picking failed. Output the merge conflict.
          if [ -n "$CANNOT_CHERRY_PICK" ]; then
            echo "Failed to cherry-pick commit."
            exit 1
          fi

          # Check for a diff between the new branch and v.next.
          if ! git diff --quiet v.next; then
            echo "Diff detected."

            # Push the new head branch to the remote.
            git push -u origin $SYNC_BRANCH

            # Find the author's GitHub username.
            COMMIT_AUTHOR=$(gh api repos/Esri/arcgis-maps-sdk-dotnet-samples/commits/$TRIGGER_COMMIT_HASH | jq -r '.author.login')

            # Try to open a PR.
            gh pr create \
              --title "[Automated] Sync v.next with main" \
              --body "This PR was automaticaly opened to update v.next with the most recent commit from main." \
              --head "$SYNC_BRANCH" \
              --base "v.next" \
              --reviewer "$COMMIT_AUTHOR" || CANNOT_OPEN_PR=$?
            if [ -n "$CANNOT_OPEN_PR" ]; then
              echo "Failed to open PR."
              git branch -D $SYNC_BRANCH
            else
              echo "PR successfully opened."
            fi
          else
            echo "No diff detected."
            git branch -D $SYNC_BRANCH
          fi