1#!/bin/sh
  2#  merge_config.sh - Takes a list of config fragment values, and merges
  3#  them one by one. Provides warnings on overridden values, and specified
  4#  values that did not make it to the resulting .config file (due to missed
  5#  dependencies or config symbol removal).
  6#
  7#  Portions reused from kconf_check and generate_cfg:
  8#  http://git.yoctoproject.org/cgit/cgit.cgi/yocto-kernel-tools/tree/tools/kconf_check
  9#  http://git.yoctoproject.org/cgit/cgit.cgi/yocto-kernel-tools/tree/tools/generate_cfg
 10#
 11#  Copyright (c) 2009-2010 Wind River Systems, Inc.
 12#  Copyright 2011 Linaro
 13#
 14#  This program is free software; you can redistribute it and/or modify
 15#  it under the terms of the GNU General Public License version 2 as
 16#  published by the Free Software Foundation.
 17#
 18#  This program is distributed in the hope that it will be useful,
 19#  but WITHOUT ANY WARRANTY; without even the implied warranty of
 20#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 21#  See the GNU General Public License for more details.
 22
 23clean_up() {
 24	rm -f $TMP_FILE
 25	exit
 26}
 27trap clean_up HUP INT TERM
 28
 29usage() {
 30	echo "Usage: $0 [OPTIONS] [CONFIG [...]]"
 31	echo "  -h    display this help text"
 32	echo "  -m    only merge the fragments, do not execute the make command"
 33	echo "  -n    use allnoconfig instead of alldefconfig"
 34	echo "  -r    list redundant entries when merging fragments"
 35}
 36
 37MAKE=true
 38ALLTARGET=alldefconfig
 39WARNREDUN=false
 40
 41while true; do
 42	case $1 in
 43	"-n")
 44		ALLTARGET=allnoconfig
 45		shift
 46		continue
 47		;;
 48	"-m")
 49		MAKE=false
 50		shift
 51		continue
 52		;;
 53	"-h")
 54		usage
 55		exit
 56		;;
 57	"-r")
 58		WARNREDUN=true
 59		shift
 60		continue
 61		;;
 62	*)
 63		break
 64		;;
 65	esac
 66done
 67
 68INITFILE=$1
 69shift;
 70
 71MERGE_LIST=$*
 72SED_CONFIG_EXP="s/^\(# \)\{0,1\}\(CONFIG_[a-zA-Z0-9_]*\)[= ].*/\2/p"
 73TMP_FILE=$(mktemp ./.tmp.config.XXXXXXXXXX)
 74
 75echo "Using $INITFILE as base"
 76cat $INITFILE > $TMP_FILE
 77
 78# Merge files, printing warnings on overrided values
 79for MERGE_FILE in $MERGE_LIST ; do
 80	echo "Merging $MERGE_FILE"
 81	CFG_LIST=$(sed -n "$SED_CONFIG_EXP" $MERGE_FILE)
 82
 83	for CFG in $CFG_LIST ; do
 84		grep -q -w $CFG $TMP_FILE
 85		if [ $? -eq 0 ] ; then
 86			PREV_VAL=$(grep -w $CFG $TMP_FILE)
 87			NEW_VAL=$(grep -w $CFG $MERGE_FILE)
 88			if [ "x$PREV_VAL" != "x$NEW_VAL" ] ; then
 89			echo Value of $CFG is redefined by fragment $MERGE_FILE:
 90			echo Previous  value: $PREV_VAL
 91			echo New value:       $NEW_VAL
 92			echo
 93			elif [ "$WARNREDUN" = "true" ]; then
 94			echo Value of $CFG is redundant by fragment $MERGE_FILE:
 95			fi
 96			sed -i "/$CFG[ =]/d" $TMP_FILE
 97		fi
 98	done
 99	cat $MERGE_FILE >> $TMP_FILE
100done
101
102if [ "$MAKE" = "false" ]; then
103	cp $TMP_FILE .config
104	echo "#"
105	echo "# merged configuration written to .config (needs make)"
106	echo "#"
107	clean_up
108	exit
109fi
110
111# Use the merged file as the starting point for:
112# alldefconfig: Fills in any missing symbols with Kconfig default
113# allnoconfig: Fills in any missing symbols with # CONFIG_* is not set
114make KCONFIG_ALLCONFIG=$TMP_FILE $ALLTARGET
115
116
117# Check all specified config values took (might have missed-dependency issues)
118for CFG in $(sed -n "$SED_CONFIG_EXP" $TMP_FILE); do
119
120	REQUESTED_VAL=$(grep -w -e "$CFG" $TMP_FILE)
121	ACTUAL_VAL=$(grep -w -e "$CFG" .config)
122	if [ "x$REQUESTED_VAL" != "x$ACTUAL_VAL" ] ; then
123		echo "Value requested for $CFG not in final .config"
124		echo "Requested value:  $REQUESTED_VAL"
125		echo "Actual value:     $ACTUAL_VAL"
126		echo ""
127	fi
128done
129
130clean_up