#! /bin/sh
# mkefipart-hfsplus - written by Andreas Loibl <andreas@andreas-loibl.de>
# 
# Generate an image for a HFS+-EFI-partition

set -e

img=efi-hfs.img
[ "$1" ] && img="$1"

label=efi-hfs.vollabel
[ "$2" ] && label="$2"
[ ! -f "$label" ] && wget -O$label http://kanotix.acritox.com/files/mac/label.vollabel

workdir=

cleanup () {
        [ "$workdir" ] || exit
	umount "$workdir" 2>/dev/null | :
	rm -rf "$workdir"
}
trap cleanup EXIT HUP INT QUIT TERM

workdir="$(mktemp -d efi-image.XXXXXX)"

# Stuff boot*.efi into a HFS+ filesystem, making it as small as possible (in MB steps).
# (x+1023)/1024*1024 rounds up to multiple of 1024.
dd if=/dev/zero of="$img" bs=1k count=$(( ($(stat -c %s binary/efi/boot/boot*.efi | awk '{s+=$1} END {print s}') / 1024 + 1023) / 1024 * 1024 )) 2>/dev/null
mkfs.hfsplus -v "KANOTIX Mac" "$img"
mount -o loop,creator=prhc,type=jxbt,uid=99,gid=99 "$img" "$workdir"
cp "$label" "$workdir"/.disk_label
mkdir -p "$workdir"/efi/boot

for file in binary/efi/boot/boot*.efi
do
	cp "$file" "$workdir/efi/boot/$(basename "$file")"
done

[ -e imagewriter.tar.gz ] && tar xzf imagewriter.tar.gz -C "$workdir"

set -- $(ls -i $workdir/efi/boot/boot*.efi)
inode=$1

umount "$workdir"

echo "Blessing file with inode $inode ($(basename "$2"))..."
perl <<EOF
open(FILE, "+< $img\0") or die "\$!\n";
binmode FILE;
seek(FILE, 0x450, SEEK_SET) or die "\$!\n";
print FILE pack('NN', 2, $inode);
seek(FILE, 0x464, SEEK_SET) or die "\$!\n";
print FILE pack('N', 2, $inode);
close(FILE);
EOF

exit 0