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Commit 4b5f7214 authored by John Stultz's avatar John Stultz Committed by Michal Marek
Browse files

kconfig: add merge_config.sh script 



After noticing almost every distro has their own method of managing config
fragments, I went looking at some best practices, and wanted to try to
consolidate some of the different approaches so this fairly simple
infrastructure can be shared (and new distros/build systems don't have to
implement yet another config fragment merge script).

This script is most influenced by the Windriver tools used in the Yocto
Project, reusing some portions found there.

This script merges multiple config fragments, warning on any overridden
values.  It then sets any unspecified values to their default, then
finally checks to make sure no specified value was dropped due to
unsatisfied dependencies.

I'm sure this implementation won't work for everyone, and I expect it will
need to evolve to adapt for various use cases.  But I think its a
reasonable starting point.

Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Greg Thelen <gthelen@google.com>
Cc: Reinhard Tartler <Reinhard.Tartler@informatik.uni-erlangen.de>
Cc: Dmitry Fink <Dmitry.Fink@palm.com>
Cc: Darren Hart <dvhart@linux.intel.com>
Cc: Eric B Munson <ebmunson@us.ibm.com>
Cc: Bruce Ashfield <Bruce.Ashfield@windriver.com>
Cc: Michal Marek <mmarek@suse.cz>
Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarMichal Marek <mmarek@suse.cz>
parent 70cc01e7

scripts/kconfig/merge_config.sh

0 → 100644
+117 −0
Original line number Original line Diff line number Diff line 
#!/bin/sh

#  merge_config.sh - Takes a list of config fragment values, and merges

#  them one by one. Provides warnings on overridden values, and specified

#  values that did not make it to the resulting .config file (due to missed

#  dependencies or config symbol removal).

#

#  Portions reused from kconf_check and generate_cfg:

#  http://git.yoctoproject.org/cgit/cgit.cgi/yocto-kernel-tools/tree/tools/kconf_check

#  http://git.yoctoproject.org/cgit/cgit.cgi/yocto-kernel-tools/tree/tools/generate_cfg

#

#  Copyright (c) 2009-2010 Wind River Systems, Inc.

#  Copyright 2011 Linaro

#

#  This program is free software; you can redistribute it and/or modify

#  it under the terms of the GNU General Public License version 2 as

#  published by the Free Software Foundation.

#

#  This program is distributed in the hope that it will be useful,

#  but WITHOUT ANY WARRANTY; without even the implied warranty of

#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

#  See the GNU General Public License for more details.



clean_up() {

       rm -f $TMP_FILE

       exit

}

trap clean_up SIGHUP SIGINT SIGTERM



usage() {

	echo "Usage: $0 [OPTIONS] [CONFIG [...]]"

	echo "  -h    display this help text"

	echo "  -m    only merge the fragments, do not execute the make command"

	echo "  -n    use allnoconfig instead of alldefconfig"

}



MAKE=true

ALLTARGET=alldefconfig



while true; do

	case $1 in

	"-n")

		ALLTARGET=allnoconfig

		shift

		continue

		;;

	"-m")

		MAKE=false

		shift

		continue

		;;

	"-h")

		usage

		exit

		;;

	*)

		break

		;;

	esac

done







MERGE_LIST=$*

SED_CONFIG_EXP="s/^\(# \)\{0,1\}\(CONFIG_[a-zA-Z0-9_]*\)[= ].*/\2/p"

TMP_FILE=$(mktemp ./.tmp.config.XXXXXXXXXX)



# Merge files, printing warnings on overrided values

for MERGE_FILE in $MERGE_LIST ; do

	echo "Merging $MERGE_FILE"

	CFG_LIST=$(sed -n "$SED_CONFIG_EXP" $MERGE_FILE)



	for CFG in $CFG_LIST ; do

		grep -q -w $CFG $TMP_FILE

		if [ $? -eq 0 ] ; then

			PREV_VAL=$(grep -w $CFG $TMP_FILE)

			NEW_VAL=$(grep -w $CFG $MERGE_FILE)

			if [ "x$PREV_VAL" != "x$NEW_VAL" ] ; then

			echo Value of $CFG is redefined by fragment $MERGE_FILE:

			echo Previous  value: $PREV_VAL

			echo New value:       $NEW_VAL

			echo

			fi

			sed -i "/$CFG[ =]/d" $TMP_FILE

		fi

	done

	cat $MERGE_FILE >> $TMP_FILE

done



if [ "$MAKE" = "false" ]; then

	cp $TMP_FILE .config

	echo "#"

	echo "# merged configuration written to .config (needs make)"

	echo "#"

	clean_up

	exit

fi



# Use the merged file as the starting point for:

# alldefconfig: Fills in any missing symbols with Kconfig default

# allnoconfig: Fills in any missing symbols with # CONFIG_* is not set

make KCONFIG_ALLCONFIG=$TMP_FILE $ALLTARGET





# Check all specified config values took (might have missed-dependency issues)

for CFG in $(sed -n "$SED_CONFIG_EXP" $TMP_FILE); do



	REQUESTED_VAL=$(sed -n "$SED_CONFIG_EXP" $TMP_FILE | grep -w -e "$CFG")

	ACTUAL_VAL=$(sed -n "$SED_CONFIG_EXP" .config | grep -w -e "$CFG")

	if [ "x$REQUESTED_VAL" != "x$ACTUAL_VAL" ] ; then

		echo "Value requested for $CFG not in final .config"

		echo "Requested value:  $REQUESTED_VAL"

		echo "Actual value:     $ACTUAL_VAL"

		echo ""

	fi

done



clean_up