#!/bin/sh
MNTPATH=/mnt/router-vm

if [ $# -lt 2 ]
then
    echo "Args: <path_router_vm_image> <path_kernel_directory>"
    exit 1
fi
IMAGE=$1
LINUXDIR=$2

# Mount
mkdir -p ${MNTPATH}
mount -o loop ${IMAGE} ${MNTPATH}

# Put the modules in there
make -C ${LINUXDIR} ARCH=i386 INSTALL_MOD_PATH=${MNTPATH} modules_install > /dev/null

# Crop everything we don't care about
LINUXVER=`grep version ${LINUXDIR}/.config | awk '{ print $5 }'`
find ${MNTPATH}/lib/modules/${LINUXVER}/kernel -type d | grep -v "net/sched\|/net/netfilter\|net/ipv4/netfilter\|kernel$\|/net$\|/ipv4$" > destroy.list
while read dir
do
    rm -rf $dir
done < destroy.list
rm -f destroy.list
rm -rf ${MNTPATH}/lib/modules/${LINUXVER}/build
rm -rf ${MNTPATH}/lib/modules/${LINUXVER}/source

#Redo depmod with the remaining subset
depmod -a -b ${MNTPATH} -F ${LINUXDIR}/System.map ${LINUXVER}

#Done, unmount
umount ${MNTPATH}
rm -rf ${MNTPATH}