+#check tmp_mnt directory
+if [ -d ./tmp_mnt ]; then
+ vtdebug "There is a tmp_mnt directory, now delete it."
+ umount ./tmp_mnt >/dev/null 2>&1
+ rm -rf ./tmp_mnt
+ if [ -d ./tmp_mnt ]; then
+ vterr "tmp_mnt directory exit, please delete it first."
+ exit 1
+ fi
+fi
+