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	echo "  -O    dir to put generated output files.  Consider setting \$KCONFIG_CONFIG instead."
 36}
 37
 38RUNMAKE=true
 39ALLTARGET=alldefconfig
 40WARNREDUN=false
 41OUTPUT=.
 42
 43while true; do
 44	case $1 in
 45	"-n")
 46		ALLTARGET=allnoconfig
 47		shift
 48		continue
 49		;;
 50	"-m")
 51		RUNMAKE=false
 52		shift
 53		continue
 54		;;
 55	"-h")
 56		usage
 57		exit
 58		;;
 59	"-r")
 60		WARNREDUN=true
 61		shift
 62		continue
 63		;;
 64	"-O")
 65		if [ -d $2 ];then
 66			OUTPUT=$(echo $2 | sed 's/\/*$//')
 67		else
 68			echo "output directory $2 does not exist" 1>&2
 69			exit 1
 70		fi
 71		shift 2
 72		continue
 73		;;
 74	*)
 75		break
 76		;;
 77	esac
 78done
 79
 80if [ "$#" -lt 1 ] ; then
 81	usage
 82	exit
 83fi
 84
 85if [ -z "$KCONFIG_CONFIG" ]; then
 86	if [ "$OUTPUT" != . ]; then
 87		KCONFIG_CONFIG=$(readlink -m -- "$OUTPUT/.config")
 88	else
 89		KCONFIG_CONFIG=.config
 90	fi
 91fi
 92
 93INITFILE=$1
 94shift;
 95
 96if [ ! -r "$INITFILE" ]; then
 97	echo "The base file '$INITFILE' does not exist.  Exit." >&2
 98	exit 1
 99fi
100
101MERGE_LIST=$*
102SED_CONFIG_EXP="s/^\(# \)\{0,1\}\(CONFIG_[a-zA-Z0-9_]*\)[= ].*/\2/p"
103TMP_FILE=$(mktemp ./.tmp.config.XXXXXXXXXX)
104
105echo "Using $INITFILE as base"
106cat $INITFILE > $TMP_FILE
107
108# Merge files, printing warnings on overridden values
109for MERGE_FILE in $MERGE_LIST ; do
110	echo "Merging $MERGE_FILE"
111	if [ ! -r "$MERGE_FILE" ]; then
112		echo "The merge file '$MERGE_FILE' does not exist.  Exit." >&2
113		exit 1
114	fi
115	CFG_LIST=$(sed -n "$SED_CONFIG_EXP" $MERGE_FILE)
116
117	for CFG in $CFG_LIST ; do
118		grep -q -w $CFG $TMP_FILE || continue
119		PREV_VAL=$(grep -w $CFG $TMP_FILE)
120		NEW_VAL=$(grep -w $CFG $MERGE_FILE)
121		if [ "x$PREV_VAL" != "x$NEW_VAL" ] ; then
122			echo Value of $CFG is redefined by fragment $MERGE_FILE:
123			echo Previous  value: $PREV_VAL
124			echo New value:       $NEW_VAL
125			echo
126		elif [ "$WARNREDUN" = "true" ]; then
127			echo Value of $CFG is redundant by fragment $MERGE_FILE:
128		fi
129		sed -i "/$CFG[ =]/d" $TMP_FILE
130	done
131	cat $MERGE_FILE >> $TMP_FILE
132done
133
134if [ "$RUNMAKE" = "false" ]; then
135	cp -T -- "$TMP_FILE" "$KCONFIG_CONFIG"
136	echo "#"
137	echo "# merged configuration written to $KCONFIG_CONFIG (needs make)"
138	echo "#"
139	clean_up
140	exit
141fi
142
143# If we have an output dir, setup the O= argument, otherwise leave
144# it blank, since O=. will create an unnecessary ./source softlink
145OUTPUT_ARG=""
146if [ "$OUTPUT" != "." ] ; then
147	OUTPUT_ARG="O=$OUTPUT"
148fi
149
150
151# Use the merged file as the starting point for:
152# alldefconfig: Fills in any missing symbols with Kconfig default
153# allnoconfig: Fills in any missing symbols with # CONFIG_* is not set
154make KCONFIG_ALLCONFIG=$TMP_FILE $OUTPUT_ARG $ALLTARGET
155
156
157# Check all specified config values took (might have missed-dependency issues)
158for CFG in $(sed -n "$SED_CONFIG_EXP" $TMP_FILE); do
159
160	REQUESTED_VAL=$(grep -w -e "$CFG" $TMP_FILE)
161	ACTUAL_VAL=$(grep -w -e "$CFG" "$KCONFIG_CONFIG")
162	if [ "x$REQUESTED_VAL" != "x$ACTUAL_VAL" ] ; then
163		echo "Value requested for $CFG not in final .config"
164		echo "Requested value:  $REQUESTED_VAL"
165		echo "Actual value:     $ACTUAL_VAL"
166		echo ""
167	fi
168done
169
170clean_up