anvil/libvirt/hooks/qemu.d/ws

#!/bin/bash
#
# Note: libvirt hook scripts execute with uid=0(root) gid=0(root) for all
#       operations, i.e., started, stopped.
#

# TODO: re-enable after the possible libvirt deadlock is fixed.
exit 0

{
	echo "wsargs=$@"

	domain_xml=$(</dev/stdin)
	guest_name="$1"
	operation="$2"

	# Operation migrate will:
	# 1. Trigger migrate->prepare->start->started operation on the destination host.
	# 2. Trigger stopped->release operations on the source host.
	if [[ "$operation" == "started" || "$operation" == "stopped" ]]
	then
		ws_open_flag=""
		ws_port_flag=""
		ws_suuid_flag=""

		if [[ "$operation" == "started" ]]
		then
			ws_open_flag="--open"

			# Cannot call $ virsh vncdisplay... because libvirt hooks
			# cannot call anything related to libvirt, i.e., virsh, because
			# a deadlock will happen.
			server_vnc_port=$( grep "<graphics.*type=['\"]vnc['\"]" <<<$domain_xml | grep -oPm1 "(?<=port=['\"])\d+" )
			ws_port_flag="--server-vnc-port ${server_vnc_port}"

			server_uuid=$( grep -oPm1 "(?<=<uuid>)[^\s]+(?=<)" <<<$domain_xml )
			ws_suuid_flag="--server-uuid ${server_uuid}"

			local_host_uuid=$(</etc/anvil/host.uuid)

			update_sql="UPDATE servers SET server_host_uuid = '$local_host_uuid' WHERE server_name = '$guest_name';"
			echo "wsupdate=$update_sql"
			anvil-access-module --query "$update_sql" --mode write
		fi

		ws_command_args="--server \"$guest_name\" $ws_suuid_flag --server-host-uuid local $ws_port_flag --component ws $ws_open_flag"
		echo "wscmd=$ws_command_args"
		striker-manage-vnc-pipes --server "$guest_name" $ws_suuid_flag --server-host-uuid local $ws_port_flag --component ws $ws_open_flag
		echo "wscmd_exit=$?"

		# Don't interrupt libvirt regardless of whether websockify gets setup
		# successfully.
		exit 0
	fi
} >>/var/log/anvil.log