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+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+#
+# merge_config.sh - Takes a list of config fragment values, and merges
+# them one by one. Provides warnings on overridden values, and specified
+# values that did not make it to the resulting .config file (due to missed
+# dependencies or config symbol removal).
+#
+# Portions reused from kconf_check and generate_cfg:
+# http://git.yoctoproject.org/cgit/cgit.cgi/yocto-kernel-tools/tree/tools/kconf_check
+# http://git.yoctoproject.org/cgit/cgit.cgi/yocto-kernel-tools/tree/tools/generate_cfg
+#
+# Copyright (c) 2009-2010 Wind River Systems, Inc.
+# Copyright 2011 Linaro
+
+set -e
+
+clean_up() {
+ rm -f $TMP_FILE
+ rm -f $MERGE_FILE
+}
+
+usage() {
+ echo "Usage: $0 [OPTIONS] [CONFIG [...]]"
+ echo " -h display this help text"
+ echo " -m only merge the fragments, do not execute the make command"
+ echo " -n use allnoconfig instead of alldefconfig"
+ echo " -r list redundant entries when merging fragments"
+ echo " -y make builtin have precedence over modules"
+ echo " -O dir to put generated output files. Consider setting \$KCONFIG_CONFIG instead."
+ echo " -s strict mode. Fail if the fragment redefines any value."
+ echo " -Q disable warning messages for overridden options."
+ echo
+ echo "Used prefix: '$CONFIG_PREFIX'. You can redefine it with \$CONFIG_ environment variable."
+}
+
+RUNMAKE=true
+ALLTARGET=alldefconfig
+WARNREDUN=false
+BUILTIN=false
+OUTPUT=.
+STRICT=false
+CONFIG_PREFIX=${CONFIG_-CONFIG_}
+WARNOVERRIDE=echo
+
+while true; do
+ case $1 in
+ "-n")
+ ALLTARGET=allnoconfig
+ shift
+ continue
+ ;;
+ "-m")
+ RUNMAKE=false
+ shift
+ continue
+ ;;
+ "-h")
+ usage
+ exit
+ ;;
+ "-r")
+ WARNREDUN=true
+ shift
+ continue
+ ;;
+ "-y")
+ BUILTIN=true
+ shift
+ continue
+ ;;
+ "-O")
+ if [ -d $2 ];then
+ OUTPUT=$(echo $2 | sed 's/\/*$//')
+ else
+ echo "output directory $2 does not exist" 1>&2
+ exit 1
+ fi
+ shift 2
+ continue
+ ;;
+ "-s")
+ STRICT=true
+ shift
+ continue
+ ;;
+ "-Q")
+ WARNOVERRIDE=true
+ shift
+ continue
+ ;;
+ *)
+ break
+ ;;
+ esac
+done
+
+if [ "$#" -lt 1 ] ; then
+ usage
+ exit
+fi
+
+if [ -z "$KCONFIG_CONFIG" ]; then
+ if [ "$OUTPUT" != . ]; then
+ KCONFIG_CONFIG=$(readlink -m -- "$OUTPUT/.config")
+ else
+ KCONFIG_CONFIG=.config
+ fi
+fi
+
+INITFILE=$1
+shift;
+
+if [ ! -r "$INITFILE" ]; then
+ echo "The base file '$INITFILE' does not exist. Creating one..." >&2
+ touch $INITFILE
+fi
+
+MERGE_LIST=$*
+SED_CONFIG_EXP1="s/^\(${CONFIG_PREFIX}[a-zA-Z0-9_]*\)=.*/\1/p"
+SED_CONFIG_EXP2="s/^# \(${CONFIG_PREFIX}[a-zA-Z0-9_]*\) is not set$/\1/p"
+
+TMP_FILE=$(mktemp ./.tmp.config.XXXXXXXXXX)
+MERGE_FILE=$(mktemp ./.merge_tmp.config.XXXXXXXXXX)
+
+echo "Using $INITFILE as base"
+
+trap clean_up EXIT
+
+cat $INITFILE > $TMP_FILE
+
+# Merge files, printing warnings on overridden values
+for ORIG_MERGE_FILE in $MERGE_LIST ; do
+ echo "Merging $ORIG_MERGE_FILE"
+ if [ ! -r "$ORIG_MERGE_FILE" ]; then
+ echo "The merge file '$ORIG_MERGE_FILE' does not exist. Exit." >&2
+ exit 1
+ fi
+ cat $ORIG_MERGE_FILE > $MERGE_FILE
+ CFG_LIST=$(sed -n -e "$SED_CONFIG_EXP1" -e "$SED_CONFIG_EXP2" $MERGE_FILE)
+
+ for CFG in $CFG_LIST ; do
+ grep -q -w $CFG $TMP_FILE || continue
+ PREV_VAL=$(grep -w $CFG $TMP_FILE)
+ NEW_VAL=$(grep -w $CFG $MERGE_FILE)
+ BUILTIN_FLAG=false
+ if [ "$BUILTIN" = "true" ] && [ "${NEW_VAL#CONFIG_*=}" = "m" ] && [ "${PREV_VAL#CONFIG_*=}" = "y" ]; then
+ ${WARNOVERRIDE} Previous value: $PREV_VAL
+ ${WARNOVERRIDE} New value: $NEW_VAL
+ ${WARNOVERRIDE} -y passed, will not demote y to m
+ ${WARNOVERRIDE}
+ BUILTIN_FLAG=true
+ elif [ "x$PREV_VAL" != "x$NEW_VAL" ] ; then
+ ${WARNOVERRIDE} Value of $CFG is redefined by fragment $ORIG_MERGE_FILE:
+ ${WARNOVERRIDE} Previous value: $PREV_VAL
+ ${WARNOVERRIDE} New value: $NEW_VAL
+ ${WARNOVERRIDE}
+ if [ "$STRICT" = "true" ]; then
+ STRICT_MODE_VIOLATED=true
+ fi
+ elif [ "$WARNREDUN" = "true" ]; then
+ ${WARNOVERRIDE} Value of $CFG is redundant by fragment $ORIG_MERGE_FILE:
+ fi
+ if [ "$BUILTIN_FLAG" = "false" ]; then
+ sed -i "/$CFG[ =]/d" $TMP_FILE
+ else
+ sed -i "/$CFG[ =]/d" $MERGE_FILE
+ fi
+ done
+ # In case the previous file lacks a new line at the end
+ echo >> $TMP_FILE
+ cat $MERGE_FILE >> $TMP_FILE
+done
+
+if [ "$STRICT_MODE_VIOLATED" = "true" ]; then
+ echo "The fragment redefined a value and strict mode had been passed."
+ exit 1
+fi
+
+if [ "$RUNMAKE" = "false" ]; then
+ cp -T -- "$TMP_FILE" "$KCONFIG_CONFIG"
+ echo "#"
+ echo "# merged configuration written to $KCONFIG_CONFIG (needs make)"
+ echo "#"
+ exit
+fi
+
+# If we have an output dir, setup the O= argument, otherwise leave
+# it blank, since O=. will create an unnecessary ./source softlink
+OUTPUT_ARG=""
+if [ "$OUTPUT" != "." ] ; then
+ OUTPUT_ARG="O=$OUTPUT"
+fi
+
+
+# Use the merged file as the starting point for:
+# alldefconfig: Fills in any missing symbols with Kconfig default
+# allnoconfig: Fills in any missing symbols with # CONFIG_* is not set
+make KCONFIG_ALLCONFIG=$TMP_FILE $OUTPUT_ARG $ALLTARGET
+
+
+# Check all specified config values took (might have missed-dependency issues)
+for CFG in $(sed -n -e "$SED_CONFIG_EXP1" -e "$SED_CONFIG_EXP2" $TMP_FILE); do
+
+ REQUESTED_VAL=$(grep -w -e "$CFG" $TMP_FILE)
+ ACTUAL_VAL=$(grep -w -e "$CFG" "$KCONFIG_CONFIG" || true)
+ if [ "x$REQUESTED_VAL" != "x$ACTUAL_VAL" ] ; then
+ echo "Value requested for $CFG not in final .config"
+ echo "Requested value: $REQUESTED_VAL"
+ echo "Actual value: $ACTUAL_VAL"
+ echo ""
+ fi
+done