xen-start

#!/usr/bin/env bash

set -o nounset
set -o errexit

if [ "$(id -u)" != "0" ]; then
	echo "You aren't root..." >&2
	exit 2
fi

#if [ -z "$1" ]; then
if [ $# -lt 1 ]; then
	echo "usage: $0 LIST,OF,DOMS,... [--force]" >&2
	echo "	--force: Start the VM even if its disk isn't synced"
	exit 1
fi

for VM in $(echo "$1" | sed 's/,/ /g'); do
	echo "Going to start $VM"
	DISKS="$(grep "'phy:/dev/drbd_" "/etc/xen/$VM.cfg" | sed -e 's/^.*phy://' -e 's/,.*//' -e 's/.*drbd_//')"
	for DISK in $DISKS; do
		echo -n " Is $DISK in sync? "
		if (drbd-overview | grep "$DISK.*UpToDate/UpToDate" > /dev/null); then
			echo -n "Yes."
		else
			if [ $# -ge 2 ] && [ "$2" == "--force" ]; then
				echo "No, but you told me to start it anyway."
			else
				echo "No, and I won't start that VM until it is." >&2; exit 3
			fi
		fi
		echo -n " Is it primary somewhere? "
		(drbd-overview | grep "$DISK.*Primary" > /dev/null) && (echo "Yes. Are you sure it isn't already running?" >&2; exit 4)
		echo "No."

		echo " Making $DISK primary here"
		(drbdadm primary $DISK) || (echo "Well, that failed..." >&2; exit 5)
	done
	echo "Creating $VM."
	(xl create /etc/xen/$VM.cfg) || (echo "I'm so sorry." >&2; exit 6)
	echo "DONE with $VM."
done