From 5ce975c6021a0b11062c547acb6c26c96a34a8c5 Mon Sep 17 00:00:00 2001
From: Tonye Jack <jtonye@ymail.com>
Date: Wed, 8 Mar 2023 20:02:52 -0700
Subject: [PATCH] fix: fetching history for pr made from a fork with checkout
 set to the target repository (#1007)

---
 diff-sha.sh | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/diff-sha.sh b/diff-sha.sh
index b4049c3d..50ae2c3c 100644
--- a/diff-sha.sh
+++ b/diff-sha.sh
@@ -188,8 +188,14 @@ else
 
   if [[ "$IS_SHALLOW" == "true" ]]; then
     echo "Fetching remote refs..."
-    # shellcheck disable=SC2086
-    git fetch $EXTRA_ARGS -u --progress origin pull/"$GITHUB_EVENT_PULL_REQUEST_NUMBER"/head:"$CURRENT_BRANCH" 1>/dev/null
+
+    if [[ "$GITHUB_EVENT_HEAD_REPO_FORK" != "true" ]]; then
+      # shellcheck disable=SC2086
+      git fetch $EXTRA_ARGS -u --progress origin pull/"$GITHUB_EVENT_PULL_REQUEST_NUMBER"/head:"$CURRENT_BRANCH" 1>/dev/null
+    else
+      # shellcheck disable=SC2086
+      git fetch $EXTRA_ARGS -u --progress origin "+refs/heads/$TARGET_BRANCH:refs/remotes/origin/$TARGET_BRANCH" "+refs/heads/$CURRENT_BRANCH*:refs/remotes/origin/$CURRENT_BRANCH*" 1>/dev/null
+    fi
     
     if [[ "$INPUT_SINCE_LAST_REMOTE_COMMIT" != "true" ]]; then
       echo "::debug::Fetching remote target branch..."