openwrt/defaults/70-rootpt-resize

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# Copied from https://openwrt.org/docs/guide-user/advanced/expand_root
if [ ! -e /etc/rootpt-resize ] \
&& type parted > /dev/null \
&& lock -n /var/lock/root-resize
then
ROOT_BLK="$(readlink -f /sys/dev/block/"$(awk -e \
'$9=="/dev/root"{print $3}' /proc/self/mountinfo)")"
ROOT_DISK="/dev/$(basename "${ROOT_BLK%/*}")"
ROOT_PART="${ROOT_BLK##*[^0-9]}"
parted -l ---pretend-input-tty << EOI
ok
fix
EOI
parted -s "${ROOT_DISK}" resizepart "${ROOT_PART}" 100%
mount_root done
touch /etc/rootpt-resize
reboot
fi
exit 1