#!/bin/bash
exec 2>&1
set -ex

TMPDIR=$(mktemp -d)
LODEV=$(losetup -f)
cleanup() {
  kpartx -d "$LODEV" || true
  losetup -d "$LODEV" || true
  rm -rf "$TMPDIR"
}
trap cleanup EXIT

mkdir "$TMPDIR"/isoroot "$TMPDIR"/isoroot/boot "$TMPDIR"/isoroot/boot/isolinux
cp /usr/lib/ISOLINUX/isolinux.bin "$TMPDIR"/isoroot/boot/isolinux/
echo 'FAKE' > "$TMPDIR"/isoroot/grml-version
echo 'LOGO' > "$TMPDIR"/isoroot/boot/logo.16
touch "$TMPDIR"/isoroot/boot/isolinux/FAKE_default.cfg
touch "$TMPDIR"/isoroot/boot/isolinux/FAKE_grml.cfg
touch "$TMPDIR"/isoroot/boot/isolinux/hidden.cfg
xorriso -as mkisofs -l -r -J -no-pad -no-emul-boot -boot-load-size 4 -boot-info-table -b boot/isolinux/isolinux.bin -c boot/isolinux/boot.cat -o "$TMPDIR"/fake.iso "$TMPDIR"/isoroot
xorriso -dev "$TMPDIR"/fake.iso -ls

dd if=/dev/zero of="$TMPDIR"/blockdev bs=1M count=50

sfdisk "$TMPDIR"/blockdev <<EOT
label: dos
label-id: 0x00000000
unit: sectors

p1 : start=        2048, size=      100352, type=6, bootable
EOT

losetup -P "$LODEV" "$TMPDIR"/blockdev

python2 $(which grml2usb) --bootloader-only --verbose --skip-usb-check --force --fat16 "$TMPDIR"/fake.iso "$LODEV"p1