Configuring a GL-iNet for Overlay

glinet_overlay

Taken from: https://forum.gl-inet.com/t/extroot-configuration/27421  
These were the only commands that seemed to work: 

I used these commands to configure it, it’s working fine so far, just want to check I won’t run into any issues down the line:

opkg update
opkg install block-mount kmod-fs-ext4 e2fsprogs

DEVICE="$(sed -n -e "/\s\/overlay\s.*$/s///p" /etc/mtab)"
uci -q delete fstab.rwm
uci set fstab.rwm="mount"
uci set fstab.rwm.device="${DEVICE}"
uci set fstab.rwm.target="/rwm"
uci commit fstab

block info

DEVICE="/dev/sda1"
umount ${DEVICE}

mkfs.ext4 -L extroot ${DEVICE}

eval $(block info ${DEVICE} | grep -o -e "UUID=\S*")
uci -q delete fstab.overlay
uci set fstab.overlay="mount"
uci set fstab.overlay.uuid="${UUID}"
uci set fstab.overlay.target="/overlay"
uci commit fstab

mount ${DEVICE} /mnt

tar -C /overlay -cvf - . | tar -C /mnt -xf -
reboot