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