1 #!/bin/sh !! 1 #! /bin/bash -x
2 # -------------------------------------------- !! 2 # extracts .config info from a [b]zImage file
3 # extract-ikconfig - Extract the .config file !! 3 # uses: binoffset (new), dd, zcat, strings, grep
4 # !! 4 # $arg1 is [b]zImage filename
5 # This will only work when the kernel was comp !! 5
6 # !! 6 HDR=`binoffset $1 0x1f 0x8b 0x08 0x0`
7 # The obscure use of the "tr" filter is to wor !! 7 PID=$$
8 # "grep" that report the byte offset of the li !! 8 TMPFILE="$1.vmlin.$PID"
9 # !! 9
10 # (c) 2009,2010 Dick Streefland <dick@streeflan !! 10 # dd if=$1 bs=1 skip=$HDR | zcat - | strings /dev/stdin \
11 # Licensed under the terms of the GNU General !! 11 # | grep "[A-Za-z_0-9]=[ynm]$" | sed "s/^/CONFIG_/" > $1.oldconfig.$PID
12 # -------------------------------------------- !! 12 # exit
13 !! 13
14 cf1='IKCFG_ST\037\213\010' !! 14 dd if=$1 bs=1 skip=$HDR | zcat - > $TMPFILE
15 cf2='0123456789' !! 15 strings $TMPFILE | grep "^[\#[:blank:]]*CONFIG_[A-Za-z_0-9]*" > $1.oldconfig.$PID
16 !! 16 wc $1.oldconfig.$PID
17 dump_config() !! 17 rm $TMPFILE
18 { <<
19 if pos=`tr "$cf1\n$cf2" "\n$cf2=" <<
20 then <<
21 pos=${pos%%:*} <<
22 tail -c+$(($pos+8)) "$1" | zca <<
23 if [ $? != 1 ] <<
24 then # exit status must be <<
25 cat $tmp1 <<
26 exit 0 <<
27 fi <<
28 fi <<
29 } <<
30 <<
31 try_decompress() <<
32 { <<
33 for pos in `tr "$1\n$2" "\n$2=" < <<
34 do <<
35 pos=${pos%%:*} <<
36 tail -c+$pos "$img" | $3 > $tm <<
37 dump_config $tmp2 <<
38 done <<
39 } <<
40 <<
41 # Check invocation: <<
42 me=${0##*/} <<
43 img=$1 <<
44 if [ $# -ne 1 -o ! -s "$img" ] <<
45 then <<
46 echo "Usage: $me <kernel-image>" >&2 <<
47 exit 2 <<
48 fi <<
49 <<
50 # Prepare temp files: <<
51 tmp1=/tmp/ikconfig$$.1 <<
52 tmp2=/tmp/ikconfig$$.2 <<
53 trap "rm -f $tmp1 $tmp2" 0 <<
54 <<
55 # Initial attempt for uncompressed images or o <<
56 dump_config "$img" <<
57 <<
58 # That didn't work, so retry after decompressi <<
59 try_decompress '\037\213\010' xy gunzip <<
60 try_decompress '\3757zXZ\000' abcde unxz <<
61 try_decompress 'BZh' xy bunzip2 <<
62 try_decompress '\135\0\0\0' xxx unlzma <<
63 try_decompress '\211\114\132' xy 'lzop -d' <<
64 try_decompress '\002\041\114\030' xyy 'lz4 -d <<
65 try_decompress '\050\265\057\375' xxx unzstd <<
66 <<
67 # Bail out: <<
68 echo "$me: Cannot find kernel config." >&2 <<
69 exit 1 <<
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