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}
35
36MAKE=true
37ALLTARGET=alldefconfig
38
39while true; do
40	case $1 in
41	"-n")
42		ALLTARGET=allnoconfig
43		shift
44		continue
45		;;
46	"-m")
47		MAKE=false
48		shift
49		continue
50		;;
51	"-h")
52		usage
53		exit
54		;;
55	*)
56		break
57		;;
58	esac
59done
60
61
62
63MERGE_LIST=$*
64SED_CONFIG_EXP="s/^\(# \)\{0,1\}\(CONFIG_[a-zA-Z0-9_]*\)[= ].*/\2/p"
65TMP_FILE=$(mktemp ./.tmp.config.XXXXXXXXXX)
66
67# Merge files, printing warnings on overrided values
68for MERGE_FILE in $MERGE_LIST ; do
69	echo "Merging $MERGE_FILE"
70	CFG_LIST=$(sed -n "$SED_CONFIG_EXP" $MERGE_FILE)
71
72	for CFG in $CFG_LIST ; do
73		grep -q -w $CFG $TMP_FILE
74		if [ $? -eq 0 ] ; then
75			PREV_VAL=$(grep -w $CFG $TMP_FILE)
76			NEW_VAL=$(grep -w $CFG $MERGE_FILE)
77			if [ "x$PREV_VAL" != "x$NEW_VAL" ] ; then
78			echo Value of $CFG is redefined by fragment $MERGE_FILE:
79			echo Previous  value: $PREV_VAL
80			echo New value:       $NEW_VAL
81			echo
82			fi
83			sed -i "/$CFG[ =]/d" $TMP_FILE
84		fi
85	done
86	cat $MERGE_FILE >> $TMP_FILE
87done
88
89if [ "$MAKE" = "false" ]; then
90	cp $TMP_FILE .config
91	echo "#"
92	echo "# merged configuration written to .config (needs make)"
93	echo "#"
94	clean_up
95	exit
96fi
97
98# Use the merged file as the starting point for:
99# alldefconfig: Fills in any missing symbols with Kconfig default
100# allnoconfig: Fills in any missing symbols with # CONFIG_* is not set
101make KCONFIG_ALLCONFIG=$TMP_FILE $ALLTARGET
102
103
104# Check all specified config values took (might have missed-dependency issues)
105for CFG in $(sed -n "$SED_CONFIG_EXP" $TMP_FILE); do
106
107	REQUESTED_VAL=$(grep -w -e "$CFG" $TMP_FILE)
108	ACTUAL_VAL=$(grep -w -e "$CFG" .config)
109	if [ "x$REQUESTED_VAL" != "x$ACTUAL_VAL" ] ; then
110		echo "Value requested for $CFG not in final .config"
111		echo "Requested value:  $REQUESTED_VAL"
112		echo "Actual value:     $ACTUAL_VAL"
113		echo ""
114	fi
115done
116
117clean_up
118