#!/sbin/sh

#check if the device is mtd
if [ -e /dev/block/mtdblock0 ] ; then
    #the device is mtd

    #mount /data
    if [ -d /data ] ; then
        /tmp/busybox mount -t ext4 /dev/block/mmcblk0p2 /data
    else
        /tmp/busybox mkdir mkdir /data
        /tmp/busybox mount -t ext4 /dev/block/mmcblk0p2 /data
    fi

    #check if /data/data is a symbolic link
    if [ -h /data/data ] ; then
        #it is not, so we will run the fixer later
        /tmp/busybox touch /tmp/nofix
    else
        #it is, so we will check if the fix can be reverted

        #check to see if mtdblock6 exists
        if ! [ -e /dev/block/mtdblock6 ] ; then
            #it doesn't, so error out the script and stop
            exit 1
        fi

        #mount /datadata
        if [ -d /datadata ] ; then
            /tmp/busybox mount -t yaffs2 /dev/block/mtdblock6 /datadata
        else
            /tmp/busybox mkdir /datadata
            /tmp/busybox mount -t yaffs2 /dev/block/mtdblock6 /datadata
        fi

        #wipe /datadata and check to make sure the amount of stuff in /data/data does not exceed the ammount of free space on /datadata
        /tmp/busybox rm -rf /datadata/*
        FREE_SPACE=$(/tmp/busybox df -k | /tmp/busybox awk '$1 == "/dev/block/mtdblock6" {print int($4/1024+512)}') ; USED_SPACE=$(/tmp/busybox du -sk /data/data/ | /tmp/busybox awk '{print int($1/1024+512)}')
        if [ $FREE_SPACE -gt $USED_SPACE ] ; then
            #there is enough room on /datadata, so continue with the revert later
            /tmp/busybox touch /tmp/revert_pass
        else
            #there is not enough room, so error out the script and stop
            exit 1
        fi
    fi
else
    #device is not mtd, so error out the script and stop
    exit 1
fi
exit 0