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
16 set -e
17
18 clean_up() {
19 rm -f $TMP_FILE
20 rm -f $MERGE_FILE
21 }
22
23 usage() {
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
37 RUNMAKE=true
38 ALLTARGET=alldefconfig
39 WARNREDUN=false
40 BUILTIN=false
41 OUTPUT=.
42 STRICT=false
43 CONFIG_PREFIX=${CONFIG_-CONFIG_}
44 WARNOVERRIDE=echo
45
46 while 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 $2 does not exist" 1>&2
77 exit 1
78 fi
79 shift 2
80 continue
81 ;;
82 "-s")
83 STRICT=true
84 shift
85 continue
86 ;;
87 "-Q")
88 WARNOVERRIDE=true
89 shift
90 continue
91 ;;
92 *)
93 break
94 ;;
95 esac
96 done
97
98 if [ "$#" -lt 1 ] ; then
99 usage
100 exit
101 fi
102
103 if [ -z "$KCONFIG_CONFIG" ]; then
104 if [ "$OUTPUT" != . ]; then
105 KCONFIG_CONFIG=$(readlink -m -- "$OUTPUT/.config")
106 else
107 KCONFIG_CONFIG=.config
108 fi
109 fi
110
111 INITFILE=$1
112 shift;
113
114 if [ ! -r "$INITFILE" ]; then
115 echo "The base file '$INITFILE' does not exist. Exit." >&2
116 exit 1
117 fi
118
119 MERGE_LIST=$*
120 SED_CONFIG_EXP1="s/^\(${CONFIG_PREFIX}[a-zA-Z0-9_]*\)=.*/\1/p"
121 SED_CONFIG_EXP2="s/^# \(${CONFIG_PREFIX}[a-zA-Z0-9_]*\) is not set$/\1/p"
122
123 TMP_FILE=$(mktemp ./.tmp.config.XXXXXXXXXX)
124 MERGE_FILE=$(mktemp ./.merge_tmp.config.XXXXXXXXXX)
125
126 echo "Using $INITFILE as base"
127
128 trap clean_up EXIT
129
130 cat $INITFILE > $TMP_FILE
131
132 # Merge files, printing warnings on overridden values
133 for 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 # In case the previous file lacks a new line at the end
171 echo >> $TMP_FILE
172 cat $MERGE_FILE >> $TMP_FILE
173 done
174
175 if [ "$STRICT_MODE_VIOLATED" = "true" ]; then
176 echo "The fragment redefined a value and strict mode had been passed."
177 exit 1
178 fi
179
180 if [ "$RUNMAKE" = "false" ]; then
181 cp -T -- "$TMP_FILE" "$KCONFIG_CONFIG"
182 echo "#"
183 echo "# merged configuration written to $KCONFIG_CONFIG (needs make)"
184 echo "#"
185 exit
186 fi
187
188 # If we have an output dir, setup the O= argument, otherwise leave
189 # it blank, since O=. will create an unnecessary ./source softlink
190 OUTPUT_ARG=""
191 if [ "$OUTPUT" != "." ] ; then
192 OUTPUT_ARG="O=$OUTPUT"
193 fi
194
195
196 # Use the merged file as the starting point for:
197 # alldefconfig: Fills in any missing symbols with Kconfig default
198 # allnoconfig: Fills in any missing symbols with # CONFIG_* is not set
199 make KCONFIG_ALLCONFIG=$TMP_FILE $OUTPUT_ARG $ALLTARGET
200
201
202 # Check all specified config values took (might have missed-dependency issues)
203 for CFG in $(sed -n -e "$SED_CONFIG_EXP1" -e "$SED_CONFIG_EXP2" $TMP_FILE); do
204
205 REQUESTED_VAL=$(grep -w -e "$CFG" $TMP_FILE)
206 ACTUAL_VAL=$(grep -w -e "$CFG" "$KCONFIG_CONFIG" || true)
207 if [ "x$REQUESTED_VAL" != "x$ACTUAL_VAL" ] ; then
208 echo "Value requested for $CFG not in final .config"
209 echo "Requested value: $REQUESTED_VAL"
210 echo "Actual value: $ACTUAL_VAL"
211 echo ""
212 fi
213 done
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