ENS202EXT OEM upgrade process pre-script

before-upgrade.sh

#!/bin/sh

rootfs_mtd="$(cat /proc/mtd | grep \"rootfs\" | cut -d : -f 1)"
rootfs_size="$(($( ( fw_printenv | grep ^rootfs_size= | cut -d = -f 2 ) 2>&- )))"
if [ ! -f "/rom/note" -a -n "${rootfs_mtd}" -a ${rootfs_size} -gt 0 ]; then
        . /lib/functions/boot.sh &&
        umount -l /jffs &&
        pivot /rom /mnt &&
        umount -l /mnt &&
        {
                dd if=/dev/${rootfs_mtd} of=/tmp/root.squashfs bs=${rootfs_size} count=1 &&
                mount /tmp/root.squashfs /mnt &&
                pivot /mnt /rom &&
                umount -l /rom
        } 2>&- || true &&
        ramoverlay &&
        [ -n "${flag_disable_umount}" ] && touch ${flag_disable_umount}
fi