• D
    kconfig: simplification of scripts/extract-ikconfig · 7b76bfc8
    Dick Streefland 提交于
    I've rewritten the extract-ikconfig script to extract the kernel
    configuration from a kernel compiled with CONFIG_IKCONFIG. The main
    motivation for the rewrite was to remove the dependency on the
    external C program binoffset.c, which is compiled on the initial run.
    
    The binoffset executable is invoked with a relative path, which means
    that the old script can only be run from the top of the kernel tree,
    and only when you have write permission in the scripts directory.
    
    The new script uses tr/grep/tail/zcat only, and can be invoked from
    anywhere. The binoffset.c program has been removed. This script
    requires GNU grep 2.5 (released 2002-03-13) or higher, because the -o
    option was introduced in that version.
    Signed-off-by: NDick Streefland <dick@streefland.net>
    LKML-Reference: <20091006203540.GA14634@streefland.net>
    Tested-by: NSteven Rostedt <rostedt@goodmis.org>
    Cc: Sam Ravnborg <sam@ravnborg.org>
    Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
    7b76bfc8
extract-ikconfig 1.3 KB
#!/bin/sh
# ----------------------------------------------------------------------
# extract-ikconfig - Extract the .config file from a kernel image
#
# This will only work when the kernel was compiled with CONFIG_IKCONFIG.
#
# 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>
# Licensed under the terms of the GNU General Public License.
# ----------------------------------------------------------------------

gz1='\037\213\010'
gz2='01'
cf1='IKCFG_ST\037\213\010'
cf2='0123456789'

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
	fi
}

# Check invocation:
me=${0##*/}
img=$1
if	[ $# -ne 1 -o ! -s "$img" ]
then
	echo "Usage: $me <kernel-image>" >&2
	exit 2
fi

# 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

# Bail out:
echo "$me: Cannot find kernel config." >&2
exit 1
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