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#!/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.
usage() {
echo "Usage: $0 [OPTIONS] [CONFIG [...]]"
echo " -h display this help text"
echo " -m only merge the fragments, do not execute the make command"
echo " -n use allnoconfig instead of alldefconfig"
echo " -d debug. Don't cleanup temporary files"
}
MAKE_FLAG=true
ALLTARGET=alldefconfig
# There are two variables that impact where the .config will be dropped,
# O= and KBUILD_OUTPUT=. So we'll respect those variables and use them as
# an output directory as well. These two variables are not propagating
# automatically to the kernel build, so always explicitly setting O=
# and passing it to the kernel build ensures that it is respected.
if [ -n "$KBUILD_OUTPUT" ]; then
O=$KBUILD_OUTPUT
fi
if [ -z "$O" ]; then
O=.
fi
while true; do
case $1 in
"-n")
ALLTARGET=allnoconfig
shift
continue
;;
"-m")
MAKE_FLAG=false
shift
continue
;;
"-d")
DEBUG=true
shift
continue
;;
"-h")
usage
exit
;;
*)
break
;;
esac
done
clean_up() {
rm -f $TMP_FILE
exit
}
if [ -z "$DEBUG" ]; then
trap clean_up SIGHUP SIGINT SIGTERM
fi
MERGE_LIST=$*
SED_CONFIG_EXP="s/^\(# \)\{0,1\}\(CONFIG_[a-zA-Z0-9_]*\)[= ].*/\2/p"
TMP_FILE=$(mktemp $O/.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_FLAG" = "false" ]; then
cp $TMP_FILE $O/.config
echo "#"
echo "# merged configuration written to $O/.config (needs make)"
echo "#"
if [ -z "$DEBUG" ]; then
clean_up
fi
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=$TMP_FILE O=$O $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" $O/.config | grep -w -e "$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: $ACTUAL_VAL"
echo ""
fi
done
if [ -z "$DEBUG" ]; then
clean_up
fi
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