#!/bin/sh
#
# Copyright (C) 2008 The FreeBSD Project. All rights reserved.
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# $FreeBSD: stable/11/sys/tools/embed_mfs.sh 312082 2017-01-13 19:22:22Z lwhsu $ 
#
# Embed the MFS image into the kernel body (expects space reserved via 
# MD_ROOT_SIZE)
#
# $1: kernel filename
# $2: MFS image filename
#

mfs_size=`stat -f '%z' $2 2> /dev/null`
# If we can't determine MFS image size - bail.
[ -z ${mfs_size} ] && echo "Can't determine MFS image size" && exit 1

sec_info=`elfdump -c $1 2> /dev/null | grep -A 5 -E "sh_name: oldmfs$"`
# If we can't find the mfs section within the given kernel - bail.
[ -z "${sec_info}" ] && echo "Can't locate mfs section within kernel" && exit 1

sec_size=`echo "${sec_info}" | awk '/sh_size/ {print $2}' 2> /dev/null`
sec_start=`echo "${sec_info}" | awk '/sh_offset/ {print $2}' 2> /dev/null`

# If the mfs section size is smaller than the mfs image - bail.
[ ${sec_size} -lt ${mfs_size} ] && echo "MFS image too large" && exit 1

# Dump the mfs image into the mfs section
dd if=$2 ibs=8192 of=$1 obs=${sec_start} oseek=1 conv=notrunc 2> /dev/null && \
    echo "MFS image embedded into kernel" && exit 0