Get the head ref and sha of a pull request comment.

Workflows for pull request comments are triggered using the issue_comment event which runs for both issues and pull requests. This action lets you filter your workflow to comments only on pull requests. It also gets the head ref and sha for the pull request branch which can be used later in the workflow.

The pull request head ref and sha are important because issue_comment workflows run against the repository's default branch (usually mater) and not the pull request's branch. With this action you'll be able to pass the ref to actions/checkout and work with the pull request's code.

on:
  issue_comment:
    types: created

jobs:
  pr-comment:
    runs-on: ubuntu-latest
    steps:
      - uses: xt0rted/pull-request-comment-branch@v1
        id: comment-branch
        with:
          repo_token: ${{ secrets.GITHUB_TOKEN }}

      - uses: actions/checkout@v2
        if: success()
        with:
          ref: ${{ steps.comment-branch.outputs.ref }}

      - run: git rev-parse --abbrev-ref HEAD
      - run: git rev-parse --verify HEAD

The scripts and documentation in this project are released under the MIT License