#!/bin/bash

#  getgrub script: Downloads GRUB and patches it.
#
#	Copyright (C) 2014, 2015 Francis Rowe <info@gluglug.org.uk>
#
#    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/>.
#

set -u -e -v

# Get GRUB, revert to commit last used and apply patches.

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

echo "DOWNLOADING GRUB"

rm -rf grub

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

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

# modifications are required
cd grub

# Reset to the last commit that was tested
# --------------------------------------------------------------------------------

git reset --hard 32cd33bd19348afb77ab849846e0b6d6157ea308

# Apply patches
# --------------------------------------------------------------------------------

# Replace "GNU GRUB version" in GRUB screen with "FREE AS IN FREEDOM"
git am "../resources/grub/patch/0001-grub-core-normal-main.c-Display-FREE-AS-IN-FREEDOM-n.patch"

## See these threads on grub-dev@gnu.org:
## [bug #44238] Add support for menu.c32 and vesamenu.c32 in lib/syslinux_parse
## [bug #44239] Behavior of syslinux_parse differs from SYSLINUX for initrd= option
## These make vesamenu.c32 work (translation: Debian/Tails ISOLINUX) but they are
## buggy at the moment; Trisquel ISOLINUX parsing fails with these patches, for instance:
## "error: syntax error.", "error: Incorrect command."
## The mailing list contains updated versions of the patches mentioned below
## Work with Lunar^ on IRC on finishing the patch so that it fixes the issue
## while not causing other regressions. Wait until this is merged in GRUB(upstream).
# Add support for menu.c32 and vesamenu.c32 in lib/syslinux_parse
# See https://savannah.gnu.org/bugs/index.php?44238
# TODO: Remove this patch when it is upstreamed.
# git am "../resources/grub/patch/0002-syslinux_parse-add-support-for-vesa-menu.c32.patch"
# Behavior of syslinux_parse differs from SYSLINUX for initrd= option
# See https://savannah.gnu.org/bugs/index.php?44239
# TODO: Remove this patch when it is upstreamed.
# git am "../resources/grub/patch/0003-syslinux_parse-keep-initrd-in-kernel-the-command-lin.patch"

cd ../
echo "FINISHED DOWNLOADING GRUB"

# ------------------- DONE ----------------------