#!/usr/bin/env bash
#
# Copyright (C) 2022 Ing <https://github.com/wjz304>
# 
# This is free software, licensed under the MIT License.
# See /LICENSE for more information.
#


GRUB=${1:-"grub-2.06"}
BIOS=${2:-"i386-pc i386-efi x86_64-efi"}

curl -#kLO https://ftp.gnu.org/gnu/grub/${GRUB}.tar.gz
tar -zxvf ${GRUB}.tar.gz

pushd ${GRUB}
for B in ${BIOS}
do
  b=${B}
  b=(${b//-/ })
  echo "Make ${b[@]} ..."

  mkdir -p ${B}
  pushd ${B}
  ../configure --prefix=$PWD/usr -sbindir=$PWD/sbin --sysconfdir=$PWD/etc --disable-werror --target=${b[0]} --with-platform=${b[1]}
  make
  make install
  popd
done
popd


rm -f grub.img
dd if=/dev/zero of=grub.img bs=1M seek=1024 count=0
echo -e "n\np\n1\n\n+50M\nn\np\n2\n\n+50M\nn\np\n3\n\n\na\n1\nw\nq\n" | fdisk grub.img
fdisk -l grub.img

LOOPX=`sudo losetup -f`
sudo losetup -P ${LOOPX} grub.img
sudo mkdosfs -F32 -n ARPL1 ${LOOPX}p1
sudo mkfs.ext2 -F -L ARPL2 ${LOOPX}p2
sudo mkfs.ext4 -F -L ARPL3 ${LOOPX}p3

rm -rf ARPL1
mkdir -p ARPL1
sudo mount ${LOOPX}p1 ARPL1

sudo mkdir -p ARPL1/EFI
sudo mkdir -p ARPL1/boot/grub
cat > device.map <<EOF
(hd0)   ${LOOPX}
EOF
sudo mv device.map ARPL1/boot/grub/device.map

for B in ${BIOS}
do
  args=""
  args+=" ${LOOPX} --target=${B} --no-floppy --recheck --grub-mkdevicemap=ARPL1/boot/grub/device.map --boot-directory=ARPL1/boot"
  if [[ "${B}" == *"efi" ]]; then
      args+=" --efi-directory=ARPL1 --removable --no-nvram"
  else
      args+=" --root-directory=ARPL1"
  fi
  sudo ${GRUB}/${B}/grub-install ${args}
done

if [ -d ARPL1/boot/grub/fonts -a -f /usr/share/grub/unicode.pf2 ]; then
  sudo cp /usr/share/grub/unicode.pf2 ARPL1/boot/grub/fonts
fi

sudo sync

sudo umount ${LOOPX}p1
sudo losetup -d ${LOOPX}
sudo rm -rf ARPL1

gzip grub.img