xref: /linux/scripts/kconfig/merge_config.sh (revision ca55b2fef3a9373fcfc30f82fd26bc7fccbda732) 
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"
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 2 ] ; then
81	usage
82	exit
83fi
84
85INITFILE=$1
86shift;
87
88if [ ! -r "$INITFILE" ]; then
89	echo "The base file '$INITFILE' does not exist.  Exit." >&2
90	exit 1
91fi
92
93MERGE_LIST=$*
94SED_CONFIG_EXP="s/^\(# \)\{0,1\}\(CONFIG_[a-zA-Z0-9_]*\)[= ].*/\2/p"
95TMP_FILE=$(mktemp ./.tmp.config.XXXXXXXXXX)
96
97echo "Using $INITFILE as base"
98cat $INITFILE > $TMP_FILE
99
100# Merge files, printing warnings on overridden values
101for MERGE_FILE in $MERGE_LIST ; do
102	echo "Merging $MERGE_FILE"
103	if [ ! -r "$MERGE_FILE" ]; then
104		echo "The merge file '$MERGE_FILE' does not exist.  Exit." >&2
105		exit 1
106	fi
107	CFG_LIST=$(sed -n "$SED_CONFIG_EXP" $MERGE_FILE)
108
109	for CFG in $CFG_LIST ; do
110		grep -q -w $CFG $TMP_FILE || continue
111		PREV_VAL=$(grep -w $CFG $TMP_FILE)
112		NEW_VAL=$(grep -w $CFG $MERGE_FILE)
113		if [ "x$PREV_VAL" != "x$NEW_VAL" ] ; then
114			echo Value of $CFG is redefined by fragment $MERGE_FILE:
115			echo Previous  value: $PREV_VAL
116			echo New value:       $NEW_VAL
117			echo
118		elif [ "$WARNREDUN" = "true" ]; then
119			echo Value of $CFG is redundant by fragment $MERGE_FILE:
120		fi
121		sed -i "/$CFG[ =]/d" $TMP_FILE
122	done
123	cat $MERGE_FILE >> $TMP_FILE
124done
125
126if [ "$RUNMAKE" = "false" ]; then
127	cp $TMP_FILE $OUTPUT/.config
128	echo "#"
129	echo "# merged configuration written to $OUTPUT/.config (needs make)"
130	echo "#"
131	clean_up
132	exit
133fi
134
135# If we have an output dir, setup the O= argument, otherwise leave
136# it blank, since O=. will create an unnecessary ./source softlink
137OUTPUT_ARG=""
138if [ "$OUTPUT" != "." ] ; then
139	OUTPUT_ARG="O=$OUTPUT"
140fi
141
142
143# Use the merged file as the starting point for:
144# alldefconfig: Fills in any missing symbols with Kconfig default
145# allnoconfig: Fills in any missing symbols with # CONFIG_* is not set
146make KCONFIG_ALLCONFIG=$TMP_FILE $OUTPUT_ARG $ALLTARGET
147
148
149# Check all specified config values took (might have missed-dependency issues)
150for CFG in $(sed -n "$SED_CONFIG_EXP" $TMP_FILE); do
151
152	REQUESTED_VAL=$(grep -w -e "$CFG" $TMP_FILE)
153	ACTUAL_VAL=$(grep -w -e "$CFG" $OUTPUT/.config)
154	if [ "x$REQUESTED_VAL" != "x$ACTUAL_VAL" ] ; then
155		echo "Value requested for $CFG not in final .config"
156		echo "Requested value:  $REQUESTED_VAL"
157		echo "Actual value:     $ACTUAL_VAL"
158		echo ""
159	fi
160done
161
162clean_up
163