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#!/bin/bash

#  getgrub script: Downloads GRUB and patches it.
#
#	Copyright (C) 2014 Francis Rowe
#
#    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/>.
#

# 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
# --------------------------------------------------------------------------------

# Commit ID used (see "git log"):
#
# commit 4b8b9135f1676924a8458da528d264bbc7bbb301
# Author: Vladimir Serbinenko <phcoder@gmail.com>
# Date:   Sun Apr 20 16:12:41 2014 +0200
#
#        * grub-core/kern/misc.c (__bzero): Don't compile in GRUB_UTIL.
#    
#        Reported by: Yves Blusseau <blusseau@zetam.org>.

git reset --hard 4b8b9135f1676924a8458da528d264bbc7bbb301

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

# See resources/grub/patch/gitdiff 
# Replace "GNU GRUB version" in GRUB screen with "FREE AS IN FREEDOM"

# copy it from resources
cp ../resources/grub/patch/gitdiff .

# apply it
git apply gitdiff

# remove the copy (no longer needed)
rm -rf gitdiff

# We don't need .git* (please submit all upstreamable changes directly to GRUB upstream)
# removing them, to reduce the size of the archive
rm -rf .git
rm -rf .gitignore

# we're done
cd ../

echo "FINISHED DOWNLOADING GRUB"

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