From a185fc24b14cc1b8a305bfc5950bd53a20c9a7cd Mon Sep 17 00:00:00 2001
From: dbroqua <dbroqua@mousur.org>
Date: Mon, 19 Nov 2018 10:41:42 +0100
Subject: [PATCH] Fixed bug in extension detection

---
 pkgkernel.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pkgkernel.sh b/pkgkernel.sh
index 6fb1c06..8d17901 100755
--- a/pkgkernel.sh
+++ b/pkgkernel.sh
@@ -5,7 +5,8 @@ DEFAULT='\033[0m'
 PREFIX='linux-'
 EXTENSION='.tar.xz'
 # For RC releases
-if [ `expr index ${1} gz` -gt 0 ] ; then 
+
+if [ `echo ${1} | sed -n "s/gz.*//p" |wc -l` -gt 0 ] ; then 
     EXTENSION='.tar.gz'
 fi