2 # ----------------------------------------------------------------------
3 # extract-ikconfig - Extract the .config file from a kernel image
5 # This will only work when the kernel was compiled with CONFIG_IKCONFIG.
7 # The obscure use of the "tr" filter is to work around older versions of
8 # "grep" that report the byte offset of the line instead of the pattern.
10 # (c) 2009,2010 Dick Streefland <dick@streefland.net>
11 # Licensed under the terms of the GNU General Public License.
12 # ----------------------------------------------------------------------
14 cf1
='IKCFG_ST\037\213\010'
19 if pos
=`tr "$cf1\n$cf2" "\n$cf2=" < "$1" | grep -abo "^$cf2"`
22 tail -c+$
(($pos+8)) "$1" | zcat
> $tmp1 2> /dev
/null
24 then # exit status must be 0 or 2 (trailing garbage warning)
33 for pos
in `tr "$1\n$2" "\n$2=" < "$img" | grep -abo "^$2"`
36 tail -c+$pos "$img" |
$3 > $tmp2 2> /dev
/null
44 if [ $# -ne 1 -o ! -s "$img" ]
46 echo "Usage: $me <kernel-image>" >&2
51 tmp1
=/tmp
/ikconfig$$
.1
52 tmp2
=/tmp
/ikconfig$$
.2
53 trap "rm -f $tmp1 $tmp2" 0
55 # Initial attempt for uncompressed images or objects:
58 # That didn't work, so retry after decompression.
59 try_decompress
'\037\213\010' xy gunzip
60 try_decompress
'BZh' xy bunzip2
61 try_decompress
'\135\0\0\0' xxx unlzma
62 try_decompress
'\211\114\132' xy
'lzop -d'
65 echo "$me: Cannot find kernel config." >&2
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