# failure to aid investigation. We don't remove the testtmp subdir at
# the end so that it can be configured as a symlink to a filesystem that
# has ACLs and xattr support enabled (if desired).
-scratchbase="$TOOLDIR"/testtmp
+scratchbase="${scratchbase:-$TOOLDIR}"/testtmp
echo " scratchbase=$scratchbase"
[ -d "$scratchbase" ] || mkdir "$scratchbase"