#!/bin/zsh -e

host=$1

die() {
	echo $@
	exit -1
}
fstab() {
	cat /etc/fstab | sed -e 's:#.*::' -e '/^$/d'
}

[ -n $host ] || die "usage $(basename $0) <host>"
echo testing /etc/xen/$host.cfg
[ -f /etc/xen/$host.cfg ] || die "/etc/xen/$host.cfg not found"
grep initrd.img- /etc/xen/vergil.cfg && die "change to short names"
grep vmlinuz- /etc/xen/vergil.cfg && die "change to short names"
[ -d /boot/xen-$host ] || die "/boot/xen-$host does not exist"
[ -d /mnt/$host ] || die "mountpoint /mnt/$host does not exist"
fstab | grep /mnt/$host >/dev/null || die "/mnt/$host not in /etc/fstab"
DEV=$(fstab | grep /mnt/$host | awk '{print $1}')
[ -e $DEV ] || die "$DEV does not exist"
DEV=$(readlink -m $DEV)
grep $DEV /proc/mounts && die "$DEV already mounted"

[ "$2" = "reboot" ] || die "add reboot to reboot"

echo shutting down ...
xm shutdown -w $host
echo done
mount -o ro /mnt/$host
cp -v /mnt/$host/boot/vmlinuz-* /boot/xen-$host/vmlinuz
cp -v /mnt/$host/boot/initrd.img-* /boot/xen-$host/initrd.img
umount /mnt/$host

xm create $host.cfg -c