Index: test_legacy.sh
--- test_legacy.sh.orig
+++ test_legacy.sh
@@ -1,6 +1,11 @@
-#!/bin/bash
+#!/bin/sh
 # this is a legacy version (will be removed in the future). please use ./test script (which uses python).
 
+if [ `id -u` != 0 ]; then
+	echo "\n*** NOTE: ${0##*/} requires root privileges ***\n\n"
+	exit 1
+fi
+
 set -v
 set -e
 
@@ -11,7 +16,7 @@ echo v1 > original/play-with-me
 echo v1 > original/delete-me
 
 cleanup() {
-    if [ -e "union" ]; then fusermount -u -q union; fi
+    if [ -e "union" ]; then umount union 2>/dev/null || true; fi
     rm -rf union original working-copy
 }
 trap cleanup EXIT
@@ -86,7 +91,7 @@ else
 fi
 set -e
 
-fusermount -u union
+umount union
 
 [ "$(cat original/file)" = "v1" ]
 [ "$(cat original/play-with-me)" = "v1" ]