From 0edcc985fadcce64f01fb77b1c15653d5e66e864 Mon Sep 17 00:00:00 2001
From: Samuel Attard <samuel.r.attard@gmail.com>
Date: Wed, 11 Jun 2025 11:51:22 -0700
Subject: [PATCH] use pr head ref

---
 script/patch-up.js | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/script/patch-up.js b/script/patch-up.js
index 760972389e..0b6d91a824 100644
--- a/script/patch-up.js
+++ b/script/patch-up.js
@@ -41,7 +41,7 @@ function getCurrentCommitSha () {
 }
 
 function getCurrentBranch () {
-  return process.env.GITHUB_REF;
+  return process.env.GITHUB_HEAD_REF;
 }
 
 async function main () {
@@ -49,6 +49,12 @@ async function main () {
     throw new Error('PATCH_UP_APP_CREDS environment variable not set');
   }
 
+  const currentBranch = getCurrentBranch();
+
+  if (!currentBranch) {
+    throw new Error('GITHUB_HEAD_REF environment variable not set. Patch Up only works in PR workflows currently.');
+  }
+
   const octokit = new Octokit({
     ...await getAuthOptionsForRepo({
       name: REPO_OWNER,
@@ -60,7 +66,6 @@ async function main () {
 
   // Get current git state
   const currentCommitSha = getCurrentCommitSha();
-  const currentBranch = getCurrentBranch();
 
   // Get the tree SHA from the current commit
   const currentCommit = await octokit.git.getCommit({