95 lines
3.2 KiB
Bash
95 lines
3.2 KiB
Bash
#!/bin/sh
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#
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# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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#
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# Copyright (C) 2008 The FreeBSD Project. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# $FreeBSD$
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#
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# Embed an MFS image into the kernel body or the loader body (expects space
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# reserved via MD_ROOT_SIZE (kernel) or MD_IMAGE_SIZE (loader))
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#
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# $1: kernel or loader filename
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# $2: MFS image filename
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#
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if [ $# -ne 2 ]; then
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echo "usage: $(basename $0) target mfs_image"
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exit 0
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fi
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if [ ! -w "$1" ]; then
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echo $1 not writable
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exit 1
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fi
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mfs_size=`stat -f '%z' $2 2> /dev/null`
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# If we can't determine MFS image size - bail.
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if [ -z ${mfs_size} ]; then
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echo "Can't determine MFS image size"
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exit 1
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fi
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err_no_mfs="Can't locate mfs section within "
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if file -b $1 | grep -q '^ELF ..-bit .SB executable'; then
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sec_info=`elfdump -c $1 2> /dev/null | grep -A 5 -E "sh_name: oldmfs$"`
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# If we can't find the mfs section within the given kernel - bail.
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if [ -z "${sec_info}" ]; then
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echo "${err_no_mfs} $1"
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exit 1
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fi
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sec_size=`echo "${sec_info}" | awk '/sh_size/ {print $2}' 2>/dev/null`
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sec_start=`echo "${sec_info}" | \
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awk '/sh_offset/ {print $2}' 2>/dev/null`
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else
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#try to find start byte of MFS start flag otherwise - bail.
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sec_start=`strings -at d $1 | grep "MFS Filesystem goes here"` || \
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{ echo "${err_no_mfs} $1"; exit 1; }
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sec_start=`echo ${sec_start} | awk '{print $1}'`
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#try to find start byte of MFS end flag otherwise - bail.
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sec_end=`strings -at d $1 | \
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grep "MFS Filesystem had better STOP here"` || \
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{ echo "${err_no_mfs} $1"; exit 1; }
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sec_end=`echo ${sec_end} | awk '{print $1}'`
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#calculate MFS section size
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sec_size=`expr ${sec_end} - ${sec_start}`
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fi
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# If the mfs section size is smaller than the mfs image - bail.
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if [ ${sec_size} -lt ${mfs_size} ]; then
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echo "MFS image too large"
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exit 1
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fi
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# Dump the mfs image into the mfs section
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dd if=$2 ibs=8192 of=$1 obs=${sec_start} oseek=1 conv=notrunc 2> /dev/null && \
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echo "MFS image embedded into $1" && exit 0
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