54 lines
1.3 KiB
Bash
Executable File
54 lines
1.3 KiB
Bash
Executable File
#!/bin/sh
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# ----------------------------------------------------------------------
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# extract-ikconfig - Extract the .config file from a kernel image
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#
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# This will only work when the kernel was compiled with CONFIG_IKCONFIG.
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#
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# The obscure use of the "tr" filter is to work around older versions of
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# "grep" that report the byte offset of the line instead of the pattern.
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#
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# (c) 2009, Dick Streefland <dick@streefland.net>
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# Licensed under the terms of the GNU General Public License.
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# ----------------------------------------------------------------------
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gz1='\037\213\010'
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gz2='01'
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cf1='IKCFG_ST\037\213\010'
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cf2='0123456789'
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dump_config()
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{
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if pos=`tr "$cf1\n$cf2" "\n$cf2=" < "$1" | grep -abo "^$cf2"`
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then
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pos=${pos%%:*}
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tail -c+$(($pos+8)) "$1" | zcat -q
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exit 0
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fi
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}
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# Check invocation:
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me=${0##*/}
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img=$1
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if [ $# -ne 1 -o ! -s "$img" ]
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then
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echo "Usage: $me <kernel-image>" >&2
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exit 2
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fi
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# Initial attempt for uncompressed images or objects:
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dump_config "$img"
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# That didn't work, so decompress and try again:
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tmp=/tmp/ikconfig$$
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trap "rm -f $tmp" 0
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for pos in `tr "$gz1\n$gz2" "\n$gz2=" < "$img" | grep -abo "^$gz2"`
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do
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pos=${pos%%:*}
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tail -c+$pos "$img" | zcat 2> /dev/null > $tmp
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dump_config $tmp
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done
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# Bail out:
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echo "$me: Cannot find kernel config." >&2
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exit 1
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