+fix_backwards_compatibility ()
+{
+ local device dir opt backing include_list
+ device=${1}
+ dir=${2}
+ opt=${3}
+
+ if [ -n "${PERSISTENCE_READONLY}" ]
+ then
+ return
+ fi
+
+ backing="$(mount_persistence_media ${device})"
+ if [ -z "${backing}" ]
+ then
+ return
+ fi
+
+ include_list="${backing}/${persistence_list}"
+ if [ ! -r "${include_list}" ] && [ ! -r "${backing}/${old_persistence_list}" ]
+ then
+ echo "# persistence backwards compatibility:
+${dir} ${opt},source=." > "${include_list}"
+ fi
+}
+