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0bf94a089d
Ensure that we are called with two arguments, and that the output file is writable. Also, if we cannot find the mfs section report the output file name rather than "kernel", as this script may be used with other than kernels. Sponsored by: The FreeBSD Foundation
61 lines
2.4 KiB
Bash
61 lines
2.4 KiB
Bash
#!/bin/sh
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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 the MFS image into the kernel body (expects space reserved via
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# MD_ROOT_SIZE)
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#
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# $1: kernel 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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[ -z ${mfs_size} ] && echo "Can't determine MFS image size" && exit 1
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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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[ -z "${sec_info}" ] && echo "Can't locate mfs section within $1" && exit 1
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sec_size=`echo "${sec_info}" | awk '/sh_size/ {print $2}' 2> /dev/null`
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sec_start=`echo "${sec_info}" | awk '/sh_offset/ {print $2}' 2> /dev/null`
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# If the mfs section size is smaller than the mfs image - bail.
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[ ${sec_size} -lt ${mfs_size} ] && echo "MFS image too large" && exit 1
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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 kernel" && exit 0
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