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