openwrtv3/package/block-mount/files/60_pivot_usb_root

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#!/bin/sh
# Copyright (C) 2010 Vertical Communications
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
# Determine if we are requested to mount external root
external_root_pivot() {
check_skip || [ "$pi_extroot_mount_success" != "true" ] || {
echo "switching to external rootfs"
if [ "$ER_OVERLAY_ROM" = "/overlay" ]; then
if [ "$ER_IS_SQUASHFS" = "true" ]; then
umount /tmp/overlay
fi
mount -o remount,ro / && fopivot /overlay /rom && pi_mount_skip_next=true
elif [ "$ER_OVERLAY_ROM" = "/rom" ]; then
if [ "$ER_IS_SQUASHFS" = "true" ]; then
umount /tmp/overlay
fi
mount -o remount,ro / && pivot_rom /rom /rom && pi_mount_skip_next=true
fi
}
}
boot_hook_add preinit_mount_root external_root_pivot