From 8212a03def7aa73e925179e2740b99c4292deeab Mon Sep 17 00:00:00 2001
From: Brendon Smith <bws@bws.bio>
Date: Thu, 30 May 2024 21:34:34 -0400
Subject: [PATCH] Checkout `github.head_ref` and repo for PRs

https://github.com/actions/checkout/issues/27#issuecomment-535897113
https://github.com/actions/checkout/issues/1108
---
 action.yml | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/action.yml b/action.yml
index bda69be..890e2cd 100644
--- a/action.yml
+++ b/action.yml
@@ -104,14 +104,16 @@ runs:
       # Set repo and ref from which to run Docker container action
       # to handle cases in which `github.action_` context is not set
       # https://github.com/actions/runner/issues/2473
-      REF=${{ env.ACTION_REF || github.ref_name }}
-      REPO=${{ env.ACTION_REPO || github.repository }}
+      REF=${{ env.ACTION_REF || env.PR_REF || github.ref_name }}
+      REPO=${{ env.ACTION_REPO || env.PR_REPO || github.repository }}
       echo "ref=$REF" >>"$GITHUB_OUTPUT"
       echo "repo=$REPO" >>"$GITHUB_OUTPUT"
     shell: bash
     env:
       ACTION_REF: ${{ github.action_ref }}
       ACTION_REPO: ${{ github.action_repository }}
+      PR_REF: ${{ github.event.pull_request.head.ref }}
+      PR_REPO: ${{ github.event.pull_request.head.repo.full_name }}
   - name: Check out action repo
     uses: actions/checkout@v4
     with: