# Copied from https://openwrt.org/docs/guide-user/advanced/expand_root
# Updated for f2fs using
# https://github.com/anaelorlinski/OpenWrt-NanoPi-R2S-R4S-Builds/blob/main/docs/resize-f2fs.md

if [ ! -e /etc/rootfs-resize ] \
&& [ -e /etc/rootpt-resize ] \
&& type losetup > /dev/null \
&& type resize.f2fs > /dev/null \
&& lock -n /var/lock/root-resize
then
LOOP="$(losetup -n -O NAME | sort | sed -n -e "1p")"
ROOT="$(losetup -n -O BACK-FILE ${LOOP} | sed -e "s|^|/dev|")"
OFFS="$(losetup -n -O OFFSET ${LOOP})"
LOOP="$(losetup -f)"
losetup -o ${OFFS} ${LOOP} ${ROOT}
fsck.f2fs -f ${LOOP}
mount ${LOOP} /mnt
touch /mnt/upper/etc/rootfs-resize
umount ${LOOP}
resize.f2fs ${LOOP}
reboot
fi
exit 1