#!/bin/bash
# $Header: /root/magellan-cvs/src/vzctl/vz.rc,v 1.2 2007-07-21 23:27:49 niro Exp $

#%rlevels: 3:s 4:s 5:s 0:k 1:k 2:k 6:k
#%start: 96
#%stop: 30

#deps
#%needs:
#%before:
#%after:

source /etc/sysconfig/rc
source $rc_functions

check_config()
{
	source /etc/vz/vz.conf

	# if we don't want openvz running, say so
	[ "${VIRTUOZZO}" = "yes" ] || return 1

	# set default values
	: ${VZCTL:=/usr/sbin/vzctl}
	: ${VZQUOTA:=/usr/sbin/vzquota}
	: ${VZVEINFO:=/proc/vz/veinfo}
	: ${VESTAT:=/proc/vz/vestat}
	: ${VPSCONFDIR:=/etc/vz/conf}
	: ${VZDEV:=venet0}
	: ${SRC_CRONSCRIPT_DIR:=/etc/vz/cron}
	: ${DST_CRONSCRIPT_DIR:=/etc/cron.d}

	if [ "${MODULES_DISABLED}" != "yes" ]
	then
		: ${PRELOAD_MODULES:="af_packet"}
		: ${MODULES:="vzmon vzdquota vzdev"}
		: ${MIGRATE_MODULES:="vzcpt vzrst"}
		: ${NET_MODULES="vznetdev vznet"}

		# check if you should load vzwdog module
		[ "${VZWDOG}" = "yes" ] && MODULES="${MODULES} vzwdog"
	fi

	# we need a working vzctl
	if [ ! -x "${VZCTL}" ]
	then
		${FAILURE} "vzctl missing (${VZCTL})"
		return 1
	fi

	if [ -z "${VE0CPUUNITS}" ]
	then
		${WARNING} "VE0CPUUNITS is not set in /etc/conf.d/vz; using default value of 1000"
		VE0CPUUNITS=1000
	fi
	return 0
}

# We used to install OpenVZ cron job when the vzctl package was
# installed, irrespective of whether OpenVZ was actually being
# run. Although the cron jobs didn't create any problems if someone
# wasn't running OpenVZ some users complained about the cron log file
# filling up, resource usage, and power consumption since systems
# wouldn't really idle. It really only makes sense to run the OpenVZ
# cron job if the vz service is turned on and not just merely
# having the package installed. This init.d script is an obvious place
# to install or remove the cron jobs based on the service
# being enabled or not.
setup_cron()
{
       [ -z "${SRC_CRONSCRIPT_DIR}" ] && return
       [ -d "${SRC_CRONSCRIPT_DIR}" ] || return
       install -m644 -o root -g root ${SRC_CRONSCRIPT_DIR}/vz ${DST_CRONSCRIPT_DIR}
}

remove_cron()
{
       [ -z "${SRC_CRONSCRIPT_DIR}" ] && return
       [ -d "${SRC_CRONSCRIPT_DIR}" ] || return
       cat > ${DST_CRONSCRIPT_DIR}/vz <<EOF
# DO NOT EDIT THIS FILE!
#
# Contents of this file managed by /etc/init.d/vz script
# Master copy is ${SRC_CRONSCRIPT_DIR}/vz.
# Consult that file for documentation.
EOF
}

setup_ve0()
{
	local msg retval ve0conf="${VPSCONFDIR}/0.conf"

	msg=$(${VZCTL} set 0 --cpuunits ${VE0CPUUNITS} 2>&1)
	[ $? -ne 0 ] && ${WARNING} "vzctl set 0 --cpuunits ${VE0CPUUNITS} failed: ${msg}"

	test -f ${ve0conf} || return
	egrep -q '^ONBOOT=yes\|^ONBOOT=\"yes\"' ${ve0conf} || return

	echo -en ${COLOREDSTAR}"Configuring hardware node UB resources: "
	msg=$(${VZCTL} set 0 --reset_ub 2>&1)
	retval=$?
	echo "${msg}"
	evaluate_retval ${retval}
}

start_net()
{
	local mod

	# we don't operate on a running interface
	if /sbin/ip addr list | grep -q "venet0:.*UP" 2>/dev/null
	then
		return 0
	fi

	# load necessary modules
	for mod in ${NET_MODULES}
	do
		/sbin/modprobe ${mod} 2>/dev/null
	done

	if [ ! -f ${VZVEINFO} ]
	then
		return 0
	fi

	# configure the device
	echo -e ${COLOREDSTAR}"Bringing up interface ${VZDEV}"
	/sbin/ip link set ${VZDEV} up
	evaluate_retval

	/sbin/ip addr add 0.0.0.0/0 dev ${VZDEV}

	echo -e ${COLOREDSTAR}"Configuring interface ${VZDEV}"
	/sbin/sysctl -q -w net.ipv4.conf.${VZDEV}.send_redirects=0
	evaluate_retval
}

stop_net()
{
	local mod

	if /sbin/ip addr list | grep -q "venet0:.*UP" 2>/dev/null
	then
		echo -e ${COLOREDSTAR}"Bringing down interface ${VZDEV}"
		/sbin/ip link set ${VZDEV} down 2>/dev/null
		evaluate_retval
	fi

	# remove all modules we probably loaded on start_net
	for mod in ${NET_MODULES}
	do
		/sbin/modprobe -r ${mod} > /dev/null 2>&1
	done
}

start_ve()
{
	local veid velist msg need_restart="" retval

	# get all VEs we should start on boot
	if ! cd ${VPSCONFDIR}
	then
		${FAILURE} "Unable to cd to ${VPSCONFDIR}"
		return 1
	fi
	velist=$(grep -l '^ONBOOT=yes\|^ONBOOT=\"yes\"' [0-9]*.conf 2>/dev/null | sed -e 's/.conf//g' | sort -n)
	cd - >/dev/null

	/sbin/sysctl -q -w net.ipv4.route.src_check=0

	for veid in ${velist}
	do
		echo -en ${COLOREDSTAR}"Starting VE ${veid}"
		if [ "${VZFASTBOOT}" = "yes" -a "${DISK_QUOTA}" = "yes" ]
		then
			${VZQUOTA} stat ${veid} >/dev/null 2>&1
			if [ $? -eq 6 ]
			then
				if ${VZQUOTA} show ${veid} 2>&1 | grep "vzquota : (warning) Quota is running" >/dev/null 2>&1
				then
					${VZQUOTA} on ${veid} --nocheck >/dev/null 2>&1
					need_restart="${need_restart} ${veid}"
				fi
			fi
		fi
		msg=$(${VZCTL} start ${veid} 2>&1)
		retval=$?
		echo "${mesg}"
		evaluate_retval ${retval}
	done

	for veid in ${need_restart}
	do
		echo -en ${COLOREDSTAR}"Stopping VE ${veid}"
		msg=$(${VZCTL} stop ${veid})
		retval=$?
		echo "${mesg}"
		evaluate_retval ${retval}

		echo -e ${COLOREDSTAR}"Starting VE ${veid}"
		msg=$($VZCTL start ${veid} 2>&1)
		retval=$?
		echo "${mesg}"
		evaluate_retval ${retval}
	done

	# we're ok even if some VEs failed to start
	return 0
}

get_parallel()
{
	[ -n "${PARALLEL}" ] && return
	PARALLEL=`awk '
BEGIN { num=0; }
$1 == "processor" { num++; }
END { print num * 4; }' /proc/cpuinfo`
}

stop_ve()
{
	local veid velist msg m mounts fail i iter pid pids quota retval

	if [ -f ${VESTAT} ]
	then
		get_parallel
		for ((i = 0; i <= 2; i++))
		do
			iter=0
			pids=
			velist=$(awk '$1 != "VEID" && $1 != "Version:" {print $1}' ${VESTAT})
			for veid in ${velist}
			do
				echo -e ${COLOREDSTAR}"Shutting down VE $veid"
				# Set fairsched parameters to maximum so
				# VE will stop fast
				${VZCTL} set ${veid} --cpuunits 2000 --cpulimit 0 >/dev/null 2>&1
				${VZCTL} --skiplock stop ${veid} >/dev/null 2>&1 &
				pids="${pids} $!"
				let iter++
				if [ ${iter} -gt ${PARALLEL} ]
				then
					for pid in ${pids}
					do
						wait ${pid}
					done
					pids=
					iter=0
				fi
			done

			for pid in ${pids}
			do
				wait ${pid}
			done
		done
	fi

	iter=0
	fail=1

	while [ ${iter} -lt 5 -a ${fail} -ne 0 ]
	do
		fail=0
		mounts=$(awk '{if ($3=="simfs") print $2}' /proc/mounts)

		for m in ${mounts}
		do
			echo -en ${COLOREDSTAR}"Unmounting VE area ${m}"
			msg=$(umount ${m} 2>&1)
			retval=$?
			echo "${mesg}"
			evaluate_retval ${retval}
			if [ $? -ne 0 ]
			then
				let fail++
				fuser -k -m ${m} > /dev/null 2>&1
			fi
		done

		let iter++
	done

	# turn quota off
	quota=$(awk -F: '/^[0-9]+:/{print $1}' /proc/vz/vzquota 2>/dev/null)

	for m in ${quota}
	do
		echo -e ${COLOREDSTAR}"Turning quota off for VE ${m}"
		msg=$(vzquota off ${m} 2>&1)
		retval=$?
		echo "${mesg}"
		evaluate_retval ${retval}
	done
}

status_ve()
{
	local velist veid
	
	check_config

	if [ -f ${VESTAT} ]
	then
		velist=$(awk '$1 != "VEID" && $1 != "Version:" {print $1}' ${VESTAT})
		for veid in ${velist}
		do
			${VZCTL} status ${veid}
		done
	fi
}

case "$1" in
	start)
		check_config || exit
	
		echo -e ${COLOREDSTAR}"Loading OpenVZ modules"
		for mod in ${PRELOAD_MODULES}
		do
			/sbin/modprobe -r ${mod} >/dev/null 2>&1
			/sbin/modprobe ${mod} >/dev/null 2>&1
		done
	
		for mod in ${MODULES}
		do
			/sbin/modprobe ${mod} >/dev/null 2>&1
			retval=$?
			if [ ${retval} -ne 0 ]
			then
				${FAILURE} "failed to load module ${mod}"
				exit ${retval}
			fi
		done
	
		for mod in ${MIGRATE_MODULES}
		do
			/sbin/modprobe ${mod} >/dev/null 2>&1
		done
		evaluate_retval
	
		if [ ! -e /dev/vzctl ]
		then
			${FAILURE} "Missing device node /dev/vzctl"
			echo
			echo "Please create the vzctl device node using the following command:"
			echo "   /bin/mknod /dev/vzctl c 126 0"
			echo
			exit 1
		fi
	
		start_net
		setup_ve0
		setup_cron
		start_ve

		update_svcstatus $1
		splash svc_started "$(basename $0)" 0
		;;

	stop)
		check_config || exit

		stop_ve
		remove_cron
		stop_net

		echo -e ${COLOREDSTAR}"Unloading OpenVZ modules"
		for mod in ${MIGRATE_MODULES}
		do
			/sbin/modprobe -r ${mod} > /dev/null 2>&1
		done

		for mod in ${MODULES}
		do
			/sbin/modprobe -r ${mod} > /dev/null 2>&1
		done

		for mod in ${PRELOAD_MODULES}
		do
			/sbin/modprobe -r ${mod} > /dev/null 2>&1
		done
		# Even if some modules failed to unload (say they were not loaded)
		# we return success for the service to be marked as stopped.
		print_status success

		update_svcstatus $1
		splash svc_stopped "$(basename $0)" 0
		;;

	restart)
		$0 stop
		sleep 1
		$0 start
		;;

	status)
		status_ve
		;;

	*)
		echo "Usage: $0 {start|stop|restart|status}"
		exit 1
		;;
esac