#!/bin/sh
# Copyright (c) 2016 Google, Inc
# Written by Simon Glass <sjg@chromium.org>
#
# Check that the u-boot.cfg file provided does not introduce any new
# ad-hoc CONFIG options
#
# Use scripts/build-whitelist.sh to generate the list of current ad-hoc
# CONFIG options (those which are not in Kconfig).

# Usage
#    check-config.sh <path to u-boot.cfg> <path to whitelist file> <source dir>
#
# For example:
#   scripts/check-config.sh b/chromebook_link/u-boot.cfg kconfig_whitelist.txt .

set -e
set -u

PROG_NAME="${0##*/}"

usage() {
	echo "$PROG_NAME <path to u-boot.cfg> <path to whitelist file> <source dir>"
	exit 1
}

[ $# -ge 3 ] || usage

path="$1"
whitelist="$2"
srctree="$3"

# Temporary files
configs="${path}.configs"
suspects="${path}.suspects"
ok="${path}.ok"
new_adhoc="${path}.adhoc"
whitelist_tmp="${path}.txt"

export LC_ALL=C
export LC_COLLATE=C

cat ${path} |sed -nr 's/^#define (CONFIG_[A-Za-z0-9_]*).*/\1/p' |sort |uniq \
	>${configs}

sort ${whitelist} -o ${whitelist_tmp}
comm -23 ${configs} ${whitelist_tmp} > ${suspects}

cat `find ${srctree} -name "Kconfig*"` |sed -nr \
	-e 's/^[[:blank:]]*config *([A-Za-z0-9_]*).*$/CONFIG_\1/p' \
	-e 's/^[[:blank:]]*menuconfig ([A-Za-z0-9_]*).*$/CONFIG_\1/p' \
	|sort |uniq > ${ok}
comm -23 ${suspects} ${ok} >${new_adhoc}
if [ -s ${new_adhoc} ]; then
	echo >&2 "Error: You must add new CONFIG options using Kconfig"
	echo >&2 "The following new ad-hoc CONFIG options were detected:"
	cat >&2 ${new_adhoc}
	echo >&2
	echo >&2 "Please add these via Kconfig instead. Find a suitable Kconfig"
	echo >&2 "file and add a 'config' or 'menuconfig' option."
	# Don't delete the temporary files in case they are useful
	exit 1
else
	rm ${suspects} ${ok} ${new_adhoc} ${whitelist_tmp}
fi