#!/usr/bin/env bash

#  helper script: Downloads GRUB and patches it.
#
#	Copyright (C) 2014, 2015, 2016, 2020, 2021 Leah Rowe <info@minifree.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/>.
#

[ "x${DEBUG+set}" = 'xset' ] && set -v
set -u -e

usage()
{
	progname="./download grub"
	printf "Usage:\n"
	printf "\t%s         # %s\n" \
	       "${progname}" \
	       "Download GRUB"
	printf "\t%s --help  # %s\n" \
	       "${progname}" \
	       "Prints this help"
}

if [ $# -ne 0 ] ; then
	usage
	exit 0
fi

# Remove the old version that may still exist
# ------------------------------------------------------------------------------

printf "Downloading GRUB\n"

rm -Rf "grub/"

# Get latest GRUB
# ------------------------------------------------------------------------------

# download it using git
git clone git://git.savannah.gnu.org/grub.git || git clone http://git.savannah.gnu.org/r/grub.git

if [ ! -d "grub" ]; then
    printf "grub not downloaded; check network connection?\n\n"
    exit 1
fi

(
# modifications are required
cd "grub/"
# reset to known revision
git reset --hard 50aace6bdb918150ba47e3c16146dcca271c134a
for grubpatch in ../resources/grub/patches/*; do
	git am "${grubpatch}"
done

git clone git://git.sv.gnu.org/gnulib gnulib
cd gnulib/

# NOTE: when updating this, make sure it's the version specified
# in bootstrap.conf on that version of GRUB, as specified above
git reset --hard d271f868a8df9bbec29049d01e056481b7a1a263
rm -Rf .git*
)

printf "\n\n"