#!/usr/bin/env bash

#  helper script: builds GRUB2 source code
#
#	Copyright (C) 2014, 2015 Leah Rowe <info@minifree.org>
#   Copyright (C) 2015, 2016 Klemens Nanni <contact@autoboot.org>
#
#    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, either version 3 of the License, or
#    (at your option) any later version.
#
#    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.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

# This script assumes that the working directory is the root
# of git or release archive

[ "x${DEBUG+set}" = 'xset' ] && set -v
set -u -e
if [ -z ${NPROC+x} ]; then
    cores="$(nproc)"
else
    case ${NPROC} in
        ''|*[!0-9]*)
            printf "value '%s' for NPROC is invalid. non-numeric. Exiting.\n" "${NPROC}"
            exit 1
            ;;
    esac
    cores="${NPROC}"
fi

# Build GRUB2 as coreboot payload

printf "Building GRUB\n"

# use a subshell to not end up in grub/ in case of build issues
(
cd grub/

# clean up first
[ -d Makefile ] && make distclean

# build
./autogen.sh
./configure --with-platform=coreboot
make -j${cores}
)

# Also build SeaBIOS, which we use with GRUB to make SeaGRUB
./oldbuild module seabios