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#!/usr/bin/env bash
#
# miniconfig - utility to minimize your coreboot config files
#
# Copyright 2015 Google Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
CONFIG=$1
NEWCONFIG=$2
CONF=build/util/kconfig/conf
KCONFIG=src/Kconfig
DOTCONFIG=.config
PREVCONFIG=.config.prev
TMPCONFIG=.config.mini
recreate_config()
{
$CONF --olddefconfig $KCONFIG &> /dev/null
}
if [ "$CONFIG" == "" ]; then
printf "usage: util/miniconfig/miniconfig [path to config file] <path to new config file>\n"
exit 0
fi
if [ ! -r "$CONFIG" ]; then
printf "Can't read $CONFIG.\n"
exit 1
fi
if [ "$CONFIG" == .config ]; then
printf "Can't use .config, it's overwritten. Make a backup.\n"
exit 1
fi
if [ ! -x "$CONF" ]; then
printf "conf utility at $CONF not available.\n"
exit 1
fi
# Start out by creating a default config file for a mainboard
VENDOR=$( grep ^CONFIG_VENDOR "$CONFIG" )
BOARD=$( grep ^CONFIG_BOARD "$CONFIG" | grep -v ROMSIZE | grep -v SPECIFIC_OPTIONS )
printf "$VENDOR\n$BOARD\n" > "$TMPCONFIG"
cp "$TMPCONFIG" "$DOTCONFIG"
recreate_config
LINES=$( cat "$CONFIG" | wc -l )
CUR=1
# Now go through each line of the existing, large config file, add it to our
# new minimal config file, and see if it makes a difference when running "make
# olddefconfig". If it does, keep the line, otherwise discard it.
cat "$CONFIG" | while read L; do
printf "\rProcessing $CONFIG - $CUR / $LINES (%d%%)" $(( $CUR * 100 / $LINES))
mv "$DOTCONFIG" "$PREVCONFIG"
cp "$TMPCONFIG" "$DOTCONFIG"
echo "$L" >> "$DOTCONFIG"
recreate_config
if ! diff -q "$DOTCONFIG" "$PREVCONFIG" > /dev/null; then
echo "$L" >> "$TMPCONFIG"
fi
CUR=$(( $CUR + 1 ))
done
echo
if [ "$NEWCONFIG" != "" ]; then
printf "Writing new, minimized config to $NEWCONFIG\n"
mv "$TMPCONFIG" "$NEWCONFIG"
else
printf "Overwriting $CONFIG with new, minimized config.\n"
mv "$TMPCONFIG" "$CONFIG"
fi
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