#!/bin/sh

cleanup() {
	if [ "$install_syslinux" = "yes" ]; then
		apk del -q syslinux
	fi
	if [ "$mount_dest" = "yes" ]; then
		umount "$dest"
	fi
}

die() {
	echo "$@" >&2
	cleanup
	exit 1
}

apk info -q -e syslinux || install_syslinux=yes


if [ "$install_syslinux" = "yes" ]; then
	apk add -q syslinux
fi

src=${1:-/media/cdrom}

[ -f "$src"/.alpine-release ] || die "$src/.alpine-release not found"


dest=${2:-/media/usb}

if ! awk '{print $2}' /proc/mounts | grep -q "^$dest\$"; then
	mount "$dest" || die "Failed to mount $dest"
	mount_dest=yes
fi

echo "Copying files..."
cp -r "$src"/* "$src"/.[a-z]* "$dest" || die "Failed to copy files"

echo "Making usb bootable..."
dev=$(awk "\$2 == \"$dest\" {print \$1}" /proc/mounts)
parent=$(basename $(dirname /sys/block/*/$(basename $dev)))

syslinux $dev

if [ -b /dev/$parent ]; then
	dd if=/usr/share/syslinux/mbr.bin of=/dev/$parent
else
	echo "Warning: Could not find the parent device for $dev"
fi

cleanup