Root/scripts/extract-ikconfig

1#!/bin/sh
2# ----------------------------------------------------------------------
3# extract-ikconfig - Extract the .config file from a kernel image
4#
5# This will only work when the kernel was compiled with CONFIG_IKCONFIG.
6#
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.
9#
10# (c) 2009, Dick Streefland <dick@streefland.net>
11# Licensed under the terms of the GNU General Public License.
12# ----------------------------------------------------------------------
13
14gz1='\037\213\010'
15gz2='01'
16cf1='IKCFG_ST\037\213\010'
17cf2='0123456789'
18
19dump_config()
20{
21    if pos=`tr "$cf1\n$cf2" "\n$cf2=" < "$1" | grep -abo "^$cf2"`
22    then
23        pos=${pos%%:*}
24        tail -c+$(($pos+8)) "$1" | zcat -q
25        exit 0
26    fi
27}
28
29# Check invocation:
30me=${0##*/}
31img=$1
32if [ $# -ne 1 -o ! -s "$img" ]
33then
34    echo "Usage: $me <kernel-image>" >&2
35    exit 2
36fi
37
38# Initial attempt for uncompressed images or objects:
39dump_config "$img"
40
41# That didn't work, so decompress and try again:
42tmp=/tmp/ikconfig$$
43trap "rm -f $tmp" 0
44for pos in `tr "$gz1\n$gz2" "\n$gz2=" < "$img" | grep -abo "^$gz2"`
45do
46    pos=${pos%%:*}
47    tail -c+$pos "$img" | zcat 2> /dev/null > $tmp
48    dump_config $tmp
49done
50
51# Bail out:
52echo "$me: Cannot find kernel config." >&2
53exit 1
54

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