#!/bin/sh

usage="Usage: $0 disk1|disk2"

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

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

if   [ "$1" = "disk1" ] ; then
	source=/share/hdd/conf
	target=/share/hdd/data
elif [ "$1" = "disk2" ] ; then
	source=/share/flash/conf
	target=/share/flash/data
else
	echo $usage
	exit 1
fi

# Check it's a real mount point

if grep $source /proc/mounts >/dev/null 2>&1 ; then
    echo "Source disk is $source"
else
    echo "Error: $source is not a mounted disk"
    exit 1
fi

if grep $target /proc/mounts >/dev/null 2>&1 ; then
    echo "Target disk is $target"
else
    echo "Error: $target is not a mounted disk"
    exit 1
fi

if [ -d $source/opt ] ; then
    if [ -d $target/opt.old -a -h $target/opt ] ; then
	echo "Reverting old /opt symlink on $target."
	rm -f $target/opt
	mv $target/opt.old $target/opt
    fi
    echo "Copying /opt directory from $source to $target."
    ( cd $source ; tar cf - opt ) | ( cd $target ; tar xf - )
    rm -rf $source/opt.old
    mv $source/opt $source/opt.old
fi

if [ -d $source/usr ] ; then
    if [ -d $target/usr/lib/ipkg.old -a -h $target/usr/lib/ipkg ] ; then
	echo "Reverting old /usr/lib/ipkg symlink on $target."
	rm -f $target/usr/lib/ipkg
	mv $target/usr/lib/ipkg.old $target/usr/lib/ipkg
    fi
    echo "Copying /usr directory from $source to $target."
    ( cd $source ; tar cf - usr ) | ( cd $target ; tar xf - )
    rm -rf $source/usr.old
    mv $source/usr $source/usr.old
fi

if [ -d $source/unslung ] ; then
    echo "Copying /unslung directory from $source to $target."
    ( cd $source ; tar cf - unslung ) | ( cd $target ; tar xf - )
    rm -rf $source/unslung.old
    mv $source/unslung $source/unslung.old
fi

if [ -f $target/opt/bin/perl ] ; then
    echo "Replicating /usr/bin/perl symlink."
    ln -s /opt/bin/perl $target/usr/bin/perl
fi

if [ -f $target/opt/bin/bash ] ; then
    echo "Replicating /bin/bash symlink."
    ln -s /opt/bin/bash $target/bin/bash
fi

exit 0