#!/system/bin/sh

MNT_DEV=""
MNT_PATH="/system/sd"
MOUNT_DEV=0

export PATH="/usr/bin:/usr/sbin:/bin:$PATH"
export TERM="xterm"
export HOME="/root"
export LANG="en_US.UTF-8"
export LC_ALL="en_US.UTF-8"

if [ $MOUNT_DEV -eq 1 ]; then
	MNT_PATH_DEV="$MNT_PATH/dev"
else
	MNT_PATH_DEV=""
fi

CHK_MOUNT(){
	awk '{if ($2=="'$1'") {exit 1;}}' /proc/mounts
	return $?
}

CLEAN_MNT(){
	busybox umount $MNT_PATH/dev/shm $MNT_PATH/dev/pts $MNT_PATH_DEV $MNT_PATH/proc $MNT_PATH/sys $MNT_PATH/sdcard $MNT_PATH/android/system
	if [ $? -ne 0 ]; then
		busybox umount -fl $MNT_PATH/dev/shm $MNT_PATH/dev/pts $MNT_PATH_DEV $MNT_PATH/proc $MNT_PATH/sys $MNT_PATH/sdcard $MNT_PATH/android/system
	fi
	umount $MNT_PATH
}

#DEVS=`cd /sys/block; ls -d sd* 2>/dev/null`
#DEV_PART="1"

DEVS="mmcblk1"
DEV_PART="p1"

for i in $DEVS; do
	if [ -d "/sys/block/"$i"/"$i$DEV_PART ]; then
		MNT_DEV=$i$DEV_PART
		echo 8192 > /sys/block/$i/queue/read_ahead_kb
		break
	fi
done

if [ -z "$MNT_DEV" ]; then
	echo "No USB disk in system"
	exit 1
fi

CHK_MOUNT $MNT_PATH
if [ $? -eq 0 ]; then
	mount -t ext4 /dev/block/$MNT_DEV $MNT_PATH
	if [ $? -ne 0 ]; then
		echo "Mount USB disk $MNT_DEV failed"
		CLEAN_MNT
		exit 2
	fi
fi

busybox rm -f $MNT_PATH/tmp/.X*-lock $MNT_PATH/tmp/.X11-unix/X* $MNT_PATH/var/log/Xorg.*.log* $MNT_PATH/var/run/dbus/*

if [ "x$MNT_PATH_DEV" = "x" ]; then
	busybox cp -ra /dev/graphics/fb* $MNT_PATH/dev
	busybox rm -rf $MNT_PATH/dev/input
	busybox cp -ra /dev/input $MNT_PATH/dev
	chmod 777 $MNT_PATH/dev/fb*
	busybox chown 0:0 $MNT_PATH/dev/fb*
	chmod 777 $MNT_PATH/dev/input/*
	busybox chown 0:0 $MNT_PATH/dev/input/*
else
	CHK_MOUNT $MNT_PATH_DEV
	if [ $? -eq 0 ]; then
		mount -o bind /dev $MNT_PATH_DEV
	fi
fi

CHK_MOUNT $MNT_PATH/dev/shm
if [ $? -eq 0 ]; then
	if [ ! -d /dev/shm ]; then
		busybox mkdir -m 777 /dev/shm
	fi
	mount -o bind /dev/shm $MNT_PATH/dev/shm
fi

CHK_MOUNT $MNT_PATH/dev/pts
if [ $? -eq 0 ]; then
	mount -t devpts devpts $MNT_PATH/dev/pts
fi

CHK_MOUNT $MNT_PATH/proc
if [ $? -eq 0 ]; then
	mount -t proc proc $MNT_PATH/proc
fi
CHK_MOUNT $MNT_PATH/sys
if [ $? -eq 0 ]; then
	mount -t sysfs sysfs $MNT_PATH/sys
fi

mount -o bind /mnt/sdcard $MNT_PATH/sdcard
mount -o bind /system $MNT_PATH/android/system

if [ ! -d /sys/module/udlfb ]; then
	insmod /system/lib/modules/udlfb.ko
fi

chroot $MNT_PATH /bin/bash

CLEAN_MNT