From 7d9d56d4532343c6cbbfec027389ce1f0e3d1147 Mon Sep 17 00:00:00 2001
From: osm0sis <osm0sis@outlook.com>
Date: Thu, 2 Feb 2017 18:26:39 -0400
Subject: [PATCH] AK2: make backup only backup when needing backup

---
 tools/ak2-core.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/ak2-core.sh b/tools/ak2-core.sh
index 319a398..31995ec 100755
--- a/tools/ak2-core.sh
+++ b/tools/ak2-core.sh
@@ -148,7 +148,7 @@ write_boot() {
 }
 
 # backup_file <file>
-backup_file() { cp $1 $1~; }
+backup_file() { test ! -f $1~ && cp $1 $1~; }
 
 # replace_string <file> <if search string> <original string> <replacement string>
 replace_string() {