elif [ -n "${opt_bind}" ] && [ -z "${PERSISTENCE_READONLY}" ]
then
mount --bind "${source}" "${dest}"
elif [ -n "${opt_bind}" -o -n "${opt_union}" ] && [ -n "${PERSISTENCE_READONLY}" ]
then
# bind-mount and union mount are handled the same
elif [ -n "${opt_bind}" ] && [ -z "${PERSISTENCE_READONLY}" ]
then
mount --bind "${source}" "${dest}"
elif [ -n "${opt_bind}" -o -n "${opt_union}" ] && [ -n "${PERSISTENCE_READONLY}" ]
then
# bind-mount and union mount are handled the same