1#!/bin/sh
2# SPDX-License-Identifier: GPL-2.0
3#
4#  merge_config.sh - Takes a list of config fragment values, and merges
5#  them one by one. Provides warnings on overridden values, and specified
6#  values that did not make it to the resulting .config file (due to missed
7#  dependencies or config symbol removal).
8#
9#  Portions reused from kconf_check and generate_cfg:
10#  http://git.yoctoproject.org/cgit/cgit.cgi/yocto-kernel-tools/tree/tools/kconf_check
11#  http://git.yoctoproject.org/cgit/cgit.cgi/yocto-kernel-tools/tree/tools/generate_cfg
12#
13#  Copyright (c) 2009-2010 Wind River Systems, Inc.
14#  Copyright 2011 Linaro
15
16set -e
17
18clean_up() {
19	rm -f $TMP_FILE
20	rm -f $MERGE_FILE
21}
22
23usage() {
24	echo "Usage: $0 [OPTIONS] [CONFIG [...]]"
25	echo "  -h    display this help text"
26	echo "  -m    only merge the fragments, do not execute the make command"
27	echo "  -n    use allnoconfig instead of alldefconfig"
28	echo "  -r    list redundant entries when merging fragments"
29	echo "  -y    make builtin have precedence over modules"
30	echo "  -O    dir to put generated output files.  Consider setting \$KCONFIG_CONFIG instead."
31	echo "  -s    strict mode. Fail if the fragment redefines any value."
32	echo "  -Q    disable warning messages for overridden options."
33	echo
34	echo "Used prefix: '$CONFIG_PREFIX'. You can redefine it with \$CONFIG_ environment variable."
35}
36
37RUNMAKE=true
38ALLTARGET=alldefconfig
39WARNREDUN=false
40BUILTIN=false
41OUTPUT=.
42STRICT=false
43CONFIG_PREFIX=${CONFIG_-CONFIG_}
44WARNOVERRIDE=echo
45
46while true; do
47	case $1 in
48	"-n")
49		ALLTARGET=allnoconfig
50		shift
51		continue
52		;;
53	"-m")
54		RUNMAKE=false
55		shift
56		continue
57		;;
58	"-h")
59		usage
60		exit
61		;;
62	"-r")
63		WARNREDUN=true
64		shift
65		continue
66		;;
67	"-y")
68		BUILTIN=true
69		shift
70		continue
71		;;
72	"-O")
73		if [ -d $2 ];then
74			OUTPUT=$(echo $2 | sed 's/\/*$//')
75		else
76			echo "output directory $2 does not exist" 1>&2
77			exit 1
78		fi
79		shift 2
80		continue
81		;;
82	"-s")
83		STRICT=true
84		shift
85		continue
86		;;
87	"-Q")
88		WARNOVERRIDE=true
89		shift
90		continue
91		;;
92	*)
93		break
94		;;
95	esac
96done
97
98if [ "$#" -lt 1 ] ; then
99	usage
100	exit
101fi
102
103if [ -z "$KCONFIG_CONFIG" ]; then
104	if [ "$OUTPUT" != . ]; then
105		KCONFIG_CONFIG=$(readlink -m -- "$OUTPUT/.config")
106	else
107		KCONFIG_CONFIG=.config
108	fi
109fi
110
111INITFILE=$1
112shift;
113
114if [ ! -r "$INITFILE" ]; then
115	echo "The base file '$INITFILE' does not exist.  Exit." >&2
116	exit 1
117fi
118
119MERGE_LIST=$*
120SED_CONFIG_EXP1="s/^\(${CONFIG_PREFIX}[a-zA-Z0-9_]*\)=.*/\1/p"
121SED_CONFIG_EXP2="s/^# \(${CONFIG_PREFIX}[a-zA-Z0-9_]*\) is not set$/\1/p"
122
123TMP_FILE=$(mktemp ./.tmp.config.XXXXXXXXXX)
124MERGE_FILE=$(mktemp ./.merge_tmp.config.XXXXXXXXXX)
125
126echo "Using $INITFILE as base"
127
128trap clean_up EXIT
129
130cat $INITFILE > $TMP_FILE
131
132# Merge files, printing warnings on overridden values
133for ORIG_MERGE_FILE in $MERGE_LIST ; do
134	echo "Merging $ORIG_MERGE_FILE"
135	if [ ! -r "$ORIG_MERGE_FILE" ]; then
136		echo "The merge file '$ORIG_MERGE_FILE' does not exist.  Exit." >&2
137		exit 1
138	fi
139	cat $ORIG_MERGE_FILE > $MERGE_FILE
140	CFG_LIST=$(sed -n -e "$SED_CONFIG_EXP1" -e "$SED_CONFIG_EXP2" $MERGE_FILE)
141
142	for CFG in $CFG_LIST ; do
143		grep -q -w $CFG $TMP_FILE || continue
144		PREV_VAL=$(grep -w $CFG $TMP_FILE)
145		NEW_VAL=$(grep -w $CFG $MERGE_FILE)
146		BUILTIN_FLAG=false
147		if [ "$BUILTIN" = "true" ] && [ "${NEW_VAL#CONFIG_*=}" = "m" ] && [ "${PREV_VAL#CONFIG_*=}" = "y" ]; then
148			${WARNOVERRIDE} Previous  value: $PREV_VAL
149			${WARNOVERRIDE} New value:       $NEW_VAL
150			${WARNOVERRIDE} -y passed, will not demote y to m
151			${WARNOVERRIDE}
152			BUILTIN_FLAG=true
153		elif [ "x$PREV_VAL" != "x$NEW_VAL" ] ; then
154			${WARNOVERRIDE} Value of $CFG is redefined by fragment $ORIG_MERGE_FILE:
155			${WARNOVERRIDE} Previous  value: $PREV_VAL
156			${WARNOVERRIDE} New value:       $NEW_VAL
157			${WARNOVERRIDE}
158			if [ "$STRICT" = "true" ]; then
159				STRICT_MODE_VIOLATED=true
160			fi
161		elif [ "$WARNREDUN" = "true" ]; then
162			${WARNOVERRIDE} Value of $CFG is redundant by fragment $ORIG_MERGE_FILE:
163		fi
164		if [ "$BUILTIN_FLAG" = "false" ]; then
165			sed -i "/$CFG[ =]/d" $TMP_FILE
166		else
167			sed -i "/$CFG[ =]/d" $MERGE_FILE
168		fi
169	done
170	cat $MERGE_FILE >> $TMP_FILE
171done
172
173if [ "$STRICT_MODE_VIOLATED" = "true" ]; then
174	echo "The fragment redefined a value and strict mode had been passed."
175	exit 1
176fi
177
178if [ "$RUNMAKE" = "false" ]; then
179	cp -T -- "$TMP_FILE" "$KCONFIG_CONFIG"
180	echo "#"
181	echo "# merged configuration written to $KCONFIG_CONFIG (needs make)"
182	echo "#"
183	exit
184fi
185
186# If we have an output dir, setup the O= argument, otherwise leave
187# it blank, since O=. will create an unnecessary ./source softlink
188OUTPUT_ARG=""
189if [ "$OUTPUT" != "." ] ; then
190	OUTPUT_ARG="O=$OUTPUT"
191fi
192
193
194# Use the merged file as the starting point for:
195# alldefconfig: Fills in any missing symbols with Kconfig default
196# allnoconfig: Fills in any missing symbols with # CONFIG_* is not set
197make KCONFIG_ALLCONFIG=$TMP_FILE $OUTPUT_ARG $ALLTARGET
198
199
200# Check all specified config values took (might have missed-dependency issues)
201for CFG in $(sed -n -e "$SED_CONFIG_EXP1" -e "$SED_CONFIG_EXP2" $TMP_FILE); do
202
203	REQUESTED_VAL=$(grep -w -e "$CFG" $TMP_FILE)
204	ACTUAL_VAL=$(grep -w -e "$CFG" "$KCONFIG_CONFIG" || true)
205	if [ "x$REQUESTED_VAL" != "x$ACTUAL_VAL" ] ; then
206		echo "Value requested for $CFG not in final .config"
207		echo "Requested value:  $REQUESTED_VAL"
208		echo "Actual value:     $ACTUAL_VAL"
209		echo ""
210	fi
211done
212