From 30b9252953b1451f1d0964e563f3440936a2a13f Mon Sep 17 00:00:00 2001
From: Tonye Jack <jtonye@ymail.com>
Date: Thu, 17 Nov 2022 08:16:17 -0700
Subject: [PATCH] Updated diff-sha.sh

---
 action.yml  | 2 +-
 diff-sha.sh | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/action.yml b/action.yml
index 8be22421..160846a6 100644
--- a/action.yml
+++ b/action.yml
@@ -80,7 +80,7 @@ inputs:
   fetch_depth:
     description: "Initial depth of the branch history fetched. **NOTE**: This can be adjusted to resolve errors with insufficient history."
     required: false
-    default: "10"
+    default: "40"
   max_fetch_depth:
     description: "Maximum depth of the branch history fetched. **NOTE**: This can be adjusted to resolve errors with insufficient history."
     required: false
diff --git a/diff-sha.sh b/diff-sha.sh
index 9ddfb9c0..69a0d9e9 100644
--- a/diff-sha.sh
+++ b/diff-sha.sh
@@ -191,7 +191,7 @@ else
         PREVIOUS_SHA=$(git rev-parse $(git branch -r --sort=-committerdate | head -1) 2>&1) && exit_status=$? || exit_status=$?
       fi
     else
-      PREVIOUS_SHA=$(git rev-list -n 1 "$TARGET_BRANCH" 2>&1) && exit_status=$? || exit_status=$?
+      PREVIOUS_SHA=$(git merge-base --fork-point "$CURRENT_BRANCH" "$TARGET_BRANCH" 2>&1) && exit_status=$? || exit_status=$?
     fi
 
     if [[ -z "$PREVIOUS_SHA" || "$PREVIOUS_SHA" == "$CURRENT_SHA" ]]; then