From eb4fb91094cf5e20bf7570da3fadb50e444284bc Mon Sep 17 00:00:00 2001
From: Avery Pennarun <apenwarr@gmail.com>
Date: Sat, 30 May 2009 03:33:17 -0400
Subject: [PATCH] Don't squash-merge if the old and new commits are the same.

---
 git-subtree.sh | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/git-subtree.sh b/git-subtree.sh
index 863e28bb7..f7fe11117 100755
--- a/git-subtree.sh
+++ b/git-subtree.sh
@@ -523,6 +523,10 @@ cmd_merge()
 		set $first_split
 		old=$1
 		sub=$2
+		if [ "$sub" = "$rev" ]; then
+			say "Subtree is already at commit $rev."
+			exit 0
+		fi
 		new=$(new_squash_commit "$old" "$sub" "$rev") || exit $?
 		debug "New squash commit: $new"
 		rev="$new"
-- 
2.30.2