diff --git a/functions.sh b/functions.sh
index 372cfaa..2ff540e 100644
--- a/functions.sh
+++ b/functions.sh
@@ -182,7 +182,15 @@ function md5 {
 	echo -ne "${am};"
 }
 
+# cleanUppkgList
+# arg1: rootfs
+function cleanUppkgList {
+	test -d ${1} || return 0
+	test -f ${1}/tmp/pkg.list && rm -f ${1}/tmp/pkg.list
+}
+
 # init pkg list
+# arg1: rootfs
 function _initPkgList {
 	root="$1"
 	test -f "${1}/tmp/pkg.list" || chroot "$1" sh -c "rpm -qa > /tmp/pkg.list"