#!/bin/sh

is_sysdisk(){
	[ -f /tmp/sysdisk ] || return 1
	grep -q $1 /tmp/sysdisk
	return $?
}


sys_shared() {
	ind=`cat /proc/mounts | grep sd | awk '{print $1","$2}'`

	for i in $ind
	do
		dev=`echo $i | cut -d "," -f 1`
		is_sysdisk $dev || lst="$lst $i"
	done

	#xargs will remove the leading space
	echo "$lst" | xargs
}

#probe if system disk or partition
# 1=Not system partition 0=System partition
probe_sysdisk() {
	is_sysdisk $1
	echo $?
}

probe_fs() {
	[ -b $1 ] && {
		type=`blkid -s TYPE $1 | cut -d "\"" -f2`
		[ -z $type ] || echo $type
	}
}


#$1 = base device, e,g, /dev/sda
probe_gpt() {
	flag=`dd bs=1 count=1 skip=450 if=$1 2>/dev/null | hexdump  -e '16/1 "%02x" "\n"'`
	if [ $flag = "ee" ]; then
		echo "GPT"
	else
		echo "MBR"
	fi
}


#$1 = base device, e,g, /dev/sda
#$2 = part id
probe_guid() {
	let i=128*$2+896
	dd bs=1 count=16 skip=$i if=$1 2>/dev/null | hexdump -e '16/1 "%02x" "\n"'
}


probe_bus() {
	local blockdev=`basename $1`
	local basedev=${blockdev%%[1-9]*}
	[ -L "/sys/block/$basedev/device" ] || return 0

	if [ `which readlink` ]; then
		local sysfsdev=`readlink -f /sys/block/$basedev/device`
		echo $sysfsdev | grep -q "usb" && echo "USB" && return
		scsiaddr=`basename $sysfsdev`
		cat /sys/class/scsi_host/host${scsiaddr%%:*}/proc_name | grep -qE "ahci|sata" && echo "SATA" && return
	else
		ls -l /sys/block/$basedev/device | grep -q "usb" && echo "USB" && return
		echo "SATA" && return
	fi
}

# Get usb storage device info based on block device node
# $1 = device node. e,g, /dev/sda, /dev/sdb1, etc

#tmp disable new interface.
probe_usbinfo_udev() {
	#xiaomi patent for mapping a mtp device as a block device
	if [ "$1" = "/dev/sdz9" ]; then
		[ -f /tmp/sdz9.txt ] && cat /tmp/sdz9.txt
		exit 0
	fi

	if [ -x /usr/sbin/udev_blk ]; then
		/usr/sbin/udev_blk usb "$1"
		return $?
	else
		return -1
	fi

}

probe_usbinfo_legacy() {
	local device=`echo $1 | cut -b 6-8`
	local sysdev
	local usbpath
	local class
	local vendor
	local product
	local usbinfo
	local base

	if [ "$1" = "/dev/sdz9" ]; then
		[ -f /tmp/sdz9.txt ] && cat /tmp/sdz9.txt
		exit 0
	fi

	#No such device
	[ -f /sys/block/$device/uevent ] || exit 1

	#Not USB device
	sysdev=`cat /sys/block/$device/uevent | grep PHYSDEVPATH | cut -d "=" -f 2`
	echo $sysdev | grep -q "usb" || exit 1

	#proble at most 10 level,skip any hub device at middle
	base=6
	while [ "$base" -le "10" ]
	do
		usbpath=`echo $sysdev | cut -d "/" -f 1-$base`
		#Reached the end
		[ -d "/sys/$usbpath" ] || exit 1
		class=`cat /sys/$usbpath/bDeviceClass`
		[ "$class" = "09" ] || break
		let "base+=1"
	done

	vendor=`cat /sys/$usbpath/idVendor`
	product=`cat /sys/$usbpath/idProduct`
	#echo $vendor $product
	usbinfo=`lsusb -d $vendor:$product -v 2&> /dev/null | grep iManufacturer -A 2`

	echo "$usbinfo" | while read line
	do
		echo $line | awk '{print $3" "$4" "$5" "$6" "$7}'
	done
}

probe_usbinfo() {
	local model=`cat /proc/xiaoqiang/model`

	case "$model" in
		"R3D")
			probe_usbinfo_udev $1
			;;
		*)
			probe_usbinfo_legacy $1
			;;
	esac
}

case $1 in
	"mnt")
		sys_shared
		;;
	"sysdisk")
		[ -z "$2" ] && exit 0
		probe_sysdisk $2
		;;
	"fs")
		[ -z "$2" ] && exit 0
		probe_fs $2
		;;
	"guid")
		[ -z "$2" ] && exit 0
		probe_guid $2 $3
		;;
	"gpt")
		[ -z "$2" ] && exit 0
		probe_gpt $2
		;;
	"bus")
		[ -z "$2" ] && exit 0
		probe_bus $2
		;;
	"usbinfo")
		[ -z "$2" ] && exit 0
		probe_usbinfo $2
		;;
	*)
		;;
esac