#!/bin/bash

# Copyright (c) 2011 Alexey I. Froloff.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

. /etc/init.d/functions

cd /etc/sysconfig/network-scripts
. ./network-functions

[ -f ../network ] && . ../network

CONFIG=${1}
TIMEOUT=10

need_config ${CONFIG}

source_config

OTHERSCRIPT="/etc/sysconfig/network-scripts/ifup-${REAL_DEVICETYPE}"

if [ ! -x ${OTHERSCRIPT} ]; then
	OTHERSCRIPT="/etc/sysconfig/network-scripts/ifup-eth"
fi

check_recursion ()
{
	[ -n "${UPPEDSTACK}" ] && for _r in ${UPPEDSTACK}; do
		[ "$_r" = "$1" ] && return 1
	done

	return 0
}

ifup_ovs_bridge ()
{
	if ovs-vsctl br-exists "${OVS_BRIDGE}"; then :; else
		/sbin/ifup "${OVS_BRIDGE}"
	fi
}

if [ -z "${UPPEDSTACK}" ]; then
	UPPEDSTACK="${DEVICE}"
fi

[ -n "${OVSREQUIRES}" ] && for _i in ${OVSREQUIRES}; do
	if ( check_recursion "$_i" ); then
		UPPEDSTACK="${UPPEDSTACK} $_i" /sbin/ifup "$_i"
	fi
done

if [ -x /usr/bin/systemctl ]; then
	if ! systemctl --quiet is-active openvswitch-nonetwork.service; then
		/usr/bin/systemctl start openvswitch-nonetwork.service
	fi
else
	if [ ! -f /var/lock/subsys/openvswitch ]; then
		/sbin/service openvswitch start
	fi
fi

case "$TYPE" in
	OVSBridge)
		# If bridge already exists and is up, it has been configured through
		# other cases like OVSPort, OVSIntPort and OVSBond. If it is down or
		# it does not exist, create it. It is possible for a bridge to exist
		# because it remained in the OVSDB for some reason, but it won't be up.
		if check_device_down "${DEVICE}"; then
			ovs-vsctl -t ${TIMEOUT} -- --may-exist add-br "$DEVICE" $OVS_OPTIONS \
			${OVS_EXTRA+-- $OVS_EXTRA} \
			${STP+-- set bridge "$DEVICE" stp_enable="${STP}"}
		else
			OVSBRIDGECONFIGURED="yes"
		fi

		# When dhcp is enabled, the assumption is that there will be a port to
		# attach (otherwise, we can't reach out for dhcp). So, we do not
		# configure the bridge through rhel's ifup infrastructure unless
		# it is being configured after the port has been configured.
		# The "OVSINTF" is set only after the port is configured.
		if [ "${OVSBOOTPROTO}" = "dhcp" ] && [ -n "${OVSINTF}" ]; then
			case " ${OVSDHCPINTERFACES} " in
				*" ${OVSINTF} "*)
					BOOTPROTO=dhcp ${OTHERSCRIPT} ${CONFIG}
				;;
			esac
		fi

		# When dhcp is not enabled, it is possible that someone may want
		# a standalone bridge (i.e it may not have any ports). Configure it.
		if [ "${OVSBOOTPROTO}" != "dhcp" ] && [ -z "${OVSINTF}" ] && \
			[ "${OVSBRIDGECONFIGURED}" != "yes" ]; then
			${OTHERSCRIPT} ${CONFIG}
		fi
		exit 0
		;;
	OVSPort)
		ifup_ovs_bridge
		${OTHERSCRIPT} ${CONFIG} ${2}
		ovs-vsctl -t ${TIMEOUT} -- --may-exist add-port "$OVS_BRIDGE" "$DEVICE" $OVS_OPTIONS ${OVS_EXTRA+-- $OVS_EXTRA}
		OVSINTF=${DEVICE} /sbin/ifup "$OVS_BRIDGE"
		;;
	OVSIntPort)
		ifup_ovs_bridge
		ovs-vsctl -t ${TIMEOUT} -- --may-exist add-port "$OVS_BRIDGE" "$DEVICE" $OVS_OPTIONS -- set Interface "$DEVICE" type=internal ${OVS_EXTRA+-- $OVS_EXTRA}
		${OTHERSCRIPT} ${CONFIG} ${2}
		;;
	OVSBond)
		ifup_ovs_bridge
		for _iface in $BOND_IFACES; do
			/sbin/ifup ${_iface}
		done
		ovs-vsctl -t ${TIMEOUT} -- --fake-iface add-bond "$OVS_BRIDGE" "$DEVICE" ${BOND_IFACES} $OVS_OPTIONS ${OVS_EXTRA+-- $OVS_EXTRA}
		${OTHERSCRIPT} ${CONFIG} ${2}
		OVSINTF=${DEVICE} /sbin/ifup "$OVS_BRIDGE"
		;;
	*)
		echo $"Invalid OVS interface type $TYPE"
		exit 1
		;;
esac