#! /bin/bash

set -ex

out=/output/grub-intel.raw

if [ -e $out ]; then
    rm $out
fi

# create the file
truncate -s2100M $out

# partition it
sgdisk \
	--new=0:4096:+2G --typecode=0:EF00 -c 0:boot   \
	--new=0:0:+2M    --typecode=0:EF02 -c 0:BIOS-BOOT \
	--hybrid=1:2 --print $out

dev=$(losetup --find --show --partscan $out)
trap "losetup -d $dev" EXIT

devmap=/tmp/devmap
cat >$devmap <<EOF
(hd0) $dev
EOF

# format filesystems
mkfs.vfat -n BLKBOOT ${dev}p1

# mount
mkdir -p /mnt
(
mount ${dev}p1 /mnt
trap "umount /mnt" EXIT

mkdir -p /mnt/grub
cp /assets/grub.cfg /mnt/grub

grub-install --target=i386-pc --boot-directory=/mnt $dev
grub-install --target=x86_64-efi --removable --boot-directory=/mnt --efi-directory=/mnt
)