Shield-Master/init at master · ItusShield/Shield-Master · GitHub

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#!/bin/sh
# Copyright (C) 2006 OpenWrt.org

mount -t proc proc /proc
mount -t sysfs sys /sys
mount -t tmpfs dev /dev
mkdir -p /dev/pts
mount -t devpts devpts /dev/pts

local sys_ext=/sys/block/mmcblk0/mmcblk0p2
local dev_ext=/dev/mmcblk0p2
local dev_ext_major=179
local dev_ext_minor=2

#local sys_ext=/sys/block/sda/sda2
#local dev_ext=/dev/sda2
#local dev_ext_major=8
#local dev_ext_minor=2
local extroot_dir=/extroot
local count=0

while true
do
    if [[ ${count} -eq 20 ]]
    then
        echo "Timed out."; break
    fi

    if [ -d ${sys_ext} ]
    then
        echo "Found ${sys_ext} : ${count}"; break
    fi

    sleep 1; echo "Waiting for extroot dev : ${dev_ext} : ${count}"; count=$((count+1))
done

if [ ! -b ${dev_ext} ]
then
    echo "Creating ${dev_ext}"; mknod ${dev_ext} b ${dev_ext_major} ${dev_ext_minor}
fi

mkdir ${extroot_dir}
echo "Mounting ${dev_ext} on ${extroot_dir}"
mount ${dev_ext} ${extroot_dir} -o noatime

umount /sys
umount /proc
umount /dev/pts
umount /dev

count=0
while true
do
    if [ -e ${extroot_dir}/init ]
    then
        echo "Found ${extroot_dir}/init"
        exec switch_root ${extroot_dir} /sbin/init
    fi

    sleep 1; echo "Checking for ${extroot_dir}/init : ${count}"; count=$((count+1))

    if [[ ${count} -eq 5 ]]
    then
        echo "Timed out."; break
    fi
done


echo "Continuing initramfs boot"
export INITRAMFS=1
exec /sbin/init