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
131