#!/bin/sh

usage="Usage: $0 disk1|disk2"

# Set target disk

if [ $# -gt 1 ] ; then
    echo $usage
    exit 1
fi

if [ $# -eq 1 ] ; then
    if [ "$1" = "disk1" ] ; then
	mtch="/dev/sdb1 /share/hdd/data ext3 rw 0 0"
	targ=/share/hdd/data
	flag=.sda1root
    elif [ "$1" = "disk2" ] ; then
	mtch="/dev/sda1 /share/flash/data ext3 rw 0 0"
	targ=/share/flash/data
	flag=.sdb1root
    else
	echo $usage
	exit 1
    fi
else
    echo $usage
    exit 1
fi

# Check it's a real mount point

echo "Waiting for $targ"
CNT=120
while [ $CNT -gt 0 ]
do
   if grep "$mtch" /proc/mounts >/dev/null 2>&1 ; then
       echo "Target disk is $targ"
       CNT=-1
   else
       echo -ne "\r$CNT   "
       sleep 1
       CNT=`expr $CNT - 1`
   fi
done
if [ $CNT -eq 0 ] ; then
   echo "Error: $targ is not a mounted disk"
   exit 1
fi

# Start at the root directory

cd /

# Save the existing ipkg database.

rm -rf $targ/usr/lib/ipkg.old
if [ -f $targ/usr/lib/ipkg/status ] ; then
	mv $targ/usr/lib/ipkg $targ/usr/lib/ipkg.old
fi

# Copy the complete rootfs to the target.

echo "Copying the complete rootfs from / to $targ."
/usr/bin/find / -print0 -mount | /usr/bin/cpio -p -0 -d -m -u $targ
rm -rf $targ/dev ; mv $targ/dev.state $targ/dev
rm -rf $targ/var ; mv $targ/var.state $targ/var

# Copy over the existing ipkg database.

if [ -f $targ/usr/lib/ipkg.old/status ] ; then
	echo "Preserving existing ipkg database on target disk."
	( cd $targ/usr/lib/ipkg.old ; tar cf - . ) | ( cd $targ/usr/lib/ipkg ; tar xf - )
fi

echo "Linking /usr/bin/ipkg executable on target disk."
rm -f $targ/usr/bin/ipkg ; ln -s /usr/bin/ipkg-cl $targ/usr/bin/ipkg

# Create the boot flag file.

rm -f /.sd??root $targ/.sd??root

echo "Creating /$flag to direct switchbox to boot from $targ."
echo > /$flag
echo > $targ/$flag

exit 0