OpenWRT - Expanding root partition and filesystem - 80-rootfs-resize

gistfile1.txt

# https://openwrt.org/docs/guide-user/advanced/expand_root

if [ ! -e /etc/rootfs-resize ] && [ -e /etc/rootpt-resize ] && lock -n /var/lock/root-resize; then
  (
    set -eux
    date
    ROOT_BLK="$(readlink -f /sys/dev/block/"$(awk -e '$9=="/dev/root"{print $3}' /proc/self/mountinfo)")"
    ROOT_DEV="/dev/${ROOT_BLK##*/}"
    LOOP_DEV="$(awk -e '$5=="/overlay"{print $9}' /proc/self/mountinfo)"

    if [ -z "${LOOP_DEV}" ]; then
      LOOP_DEV="$(losetup -f)"
      losetup "${LOOP_DEV}" "${ROOT_DEV}"
    fi

    resize2fs -f "${LOOP_DEV}"
    mount_root done
  ) 2>&1 | tee -a /etc/rootfs-resize

  reboot
fi
exit 1