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scripts/extract-ikconfig: add support for bzip2, lzma and lzo

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Add support for kernels compressed with bzip2, lzma or lzo to the
extract-ikconfig script.

Fixes kernel bugzilla #19852:
https://bugzilla.kernel.org/show_bug.cgi?id=19852

Signed-off-by: Dick Streefland <dick@streefland.net>
Tested-by: Justin <jlec@gentoo.org>
Signed-off-by: Michal Marek <mmarek@suse.cz>
This commit is contained in:
Dick Streefland 2010-10-23 00:02:44 +02:00 committed by Michal Marek
parent d0f95c7826
commit 532cf2907a
1 changed files with 27 additions and 14 deletions
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41
scripts/extract-ikconfig
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@ -7,12 +7,10 @@
# The obscure use of the "tr" filter is to work around older versions of
# "grep" that report the byte offset of the line instead of the pattern.
#
# (c) 2009, Dick Streefland <dick@streefland.net>
# (c) 2009,2010 Dick Streefland <dick@streefland.net>
# Licensed under the terms of the GNU General Public License.
# ----------------------------------------------------------------------
gz1='\037\213\010'
gz2='01'
cf1='IKCFG_ST\037\213\010'
cf2='0123456789'
@ -21,11 +19,25 @@ dump_config()
if pos=`tr "$cf1\n$cf2" "\n$cf2=" < "$1" | grep -abo "^$cf2"`
then
pos=${pos%%:*}
tail -c+$(($pos+8)) "$1" | zcat -q
exit 0
tail -c+$(($pos+8)) "$1" | zcat > $tmp1 2> /dev/null
if [ $? != 1 ]
then # exit status must be 0 or 2 (trailing garbage warning)
cat $tmp1
exit 0
fi
fi
}
try_decompress()
{
for pos in `tr "$1\n$2" "\n$2=" < "$img" | grep -abo "^$2"`
do
pos=${pos%%:*}
tail -c+$pos "$img" | $3 > $tmp2 2> /dev/null
dump_config $tmp2
done
}
# Check invocation:
me=${0##*/}
img=$1
@ -35,18 +47,19 @@ then
exit 2
fi
# Prepare temp files:
tmp1=/tmp/ikconfig$$.1
tmp2=/tmp/ikconfig$$.2
trap "rm -f $tmp1 $tmp2" 0
# Initial attempt for uncompressed images or objects:
dump_config "$img"
# That didn't work, so decompress and try again:
tmp=/tmp/ikconfig$$
trap "rm -f $tmp" 0
for pos in `tr "$gz1\n$gz2" "\n$gz2=" < "$img" | grep -abo "^$gz2"`
do
pos=${pos%%:*}
tail -c+$pos "$img" | zcat 2> /dev/null > $tmp
dump_config $tmp
done
# That didn't work, so retry after decompression.
try_decompress '\037\213\010' xy gunzip
try_decompress 'BZh' xy bunzip2
try_decompress '\135\0\0\0' xxx unlzma
try_decompress '\211\114\132' xy 'lzop -d'
# Bail out:
echo "$me: Cannot find kernel config." >&2