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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) 2009,2010 Dick Streefland <dick@streefland.net> |
11 | # Licensed under the terms of the GNU General Public License. |
12 | # ---------------------------------------------------------------------- |
13 | |
14 | cf1='IKCFG_ST\037\213\010' |
15 | cf2='0123456789' |
16 | |
17 | dump_config() |
18 | { |
19 | if pos=`tr "$cf1\n$cf2" "\n$cf2=" < "$1" | grep -abo "^$cf2"` |
20 | then |
21 | pos=${pos%%:*} |
22 | tail -c+$(($pos+8)) "$1" | zcat > $tmp1 2> /dev/null |
23 | if [ $? != 1 ] |
24 | then # exit status must be 0 or 2 (trailing garbage warning) |
25 | cat $tmp1 |
26 | exit 0 |
27 | fi |
28 | fi |
29 | } |
30 | |
31 | try_decompress() |
32 | { |
33 | for pos in `tr "$1\n$2" "\n$2=" < "$img" | grep -abo "^$2"` |
34 | do |
35 | pos=${pos%%:*} |
36 | tail -c+$pos "$img" | $3 > $tmp2 2> /dev/null |
37 | dump_config $tmp2 |
38 | done |
39 | } |
40 | |
41 | # Check invocation: |
42 | me=${0##*/} |
43 | img=$1 |
44 | if [ $# -ne 1 -o ! -s "$img" ] |
45 | then |
46 | echo "Usage: $me <kernel-image>" >&2 |
47 | exit 2 |
48 | fi |
49 | |
50 | # Prepare temp files: |
51 | tmp1=/tmp/ikconfig$$.1 |
52 | tmp2=/tmp/ikconfig$$.2 |
53 | trap "rm -f $tmp1 $tmp2" 0 |
54 | |
55 | # Initial attempt for uncompressed images or objects: |
56 | dump_config "$img" |
57 | |
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' |
63 | |
64 | # Bail out: |
65 | echo "$me: Cannot find kernel config." >&2 |
66 | exit 1 |
67 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9