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Commit 532cf290 authored by Dick Streefland's avatar Dick Streefland Committed by Michal Marek
Browse files

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

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: default avatarDick Streefland <dick@streefland.net>
Tested-by: default avatarJustin <jlec@gentoo.org>
Signed-off-by: default avatarMichal Marek <mmarek@suse.cz>
parent d0f95c78

scripts/extract-ikconfig

+27 −14
Original line number Diff line number Diff line
@@ -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'
@@ -21,9 +19,23 @@ dump_config() 
	if	pos=`tr "$cf1\n$cf2" "\n$cf2=" < "$1" | grep -abo "^$cf2"`

	then

		pos=${pos%%:*}

		tail -c+$(($pos+8)) "$1" | zcat -q

		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:
@@ -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