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#!/bin/bash
#
# Init script for the Eucalyptus node controller
#
# Copyright 2009-2012 Eucalyptus Systems, Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 3 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see http://www.gnu.org/licenses/.
#
# Please contact Eucalyptus Systems, Inc., 6755 Hollister Ave., Goleta
# CA 93117, USA or visit http://www.eucalyptus.com/licenses/ if you need
# additional information or have any questions.
#
# This file may incorporate work covered under the following copyright
# and permission notice:
#
# Software License Agreement (BSD License)
#
# Copyright (c) 2008, Regents of the University of California
# All rights reserved.
#
# Redistribution and use of this software in source and binary forms,
# with or without modification, are permitted provided that the
# following conditions are met:
#
# Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE. USERS OF THIS SOFTWARE ACKNOWLEDGE
# THE POSSIBLE PRESENCE OF OTHER OPEN SOURCE LICENSED MATERIAL,
# COPYRIGHTED MATERIAL OR PATENTED MATERIAL IN THIS SOFTWARE,
# AND IF ANY SUCH MATERIAL IS DISCOVERED THE PARTY DISCOVERING
# IT MAY INFORM DR. RICH WOLSKI AT THE UNIVERSITY OF CALIFORNIA,
# SANTA BARBARA WHO WILL THEN ASCERTAIN THE MOST APPROPRIATE REMEDY,
# WHICH IN THE REGENTS' DISCRETION MAY INCLUDE, WITHOUT LIMITATION,
# REPLACEMENT OF THE CODE SO IDENTIFIED, LICENSING OF THE CODE SO
# IDENTIFIED, OR WITHDRAWAL OF THE CODE CAPABILITY TO THE EXTENT
# NEEDED TO COMPLY WITH ANY SUCH LICENSES OR RIGHTS.
#
# chkconfig: 2345 99 05
# description: eucalyptus node controller
#
### BEGIN INIT INFO
# Provides: eucalyptus-nc
# Required-Start: $remote_fs $syslog libvirtd
# Required-Stop: $remote_fs $syslog
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Eucalyptus node controller
# Description: Eucalyptus node controller
### END INIT INFO
#

# Do NOT "set -e"

# Use the functions script for distributions that support it (e.g., RHEL)
# This allows Eucalyptus to use correct localization settings
[ -f /etc/init.d/functions ] && . /etc/init.d/functions

LOCKFILE=/var/lock/subsys/eucalyptus-nc

# if we have lsb functions let's source them
WE_HAVE_LSB="N"
if [ -e /lib/lsb/init-functions ]; then
. /lib/lsb/init-functions
# very old lsb don't have the functions we need
if type log_daemon_msg > /dev/null 2> /dev/null ; then
WE_HAVE_LSB="Y"
fi
fi

if [ "$EUID" != "0" ]; then
    echo "Eucalyptus init scritps must be run as root."
    exit 1
fi

# I just wanted to set PATH to be the system PATH, but if a user install
# eucalyptus manually, it may have binaries in a non-standard position:
# hence we need to keep the PATH we receive.
export PATH=/sbin:/usr/sbin:/bin:/usr/bin:$PATH
DESC="Eucalyptus services"
NAME=eucalyptus-nc
BRCTL="`which brctl 2> /dev/null`"
MODPROBE="`which modprobe 2> /dev/null`"
EUCA_USER="eucalyptus"

# honor the ENV variable if found otherwise look in root
if [ -z "$EUCALYPTUS" ] ; then
       EUCALYPTUS="@prefix@"
       if [ ! -e ${EUCALYPTUS}/etc/eucalyptus/eucalyptus.conf ] ; then
              EUCALYPTUS="/"
       fi
fi
export EUCALYPTUS

create_httpd_config() {
IPS="all"

# let's configure the common parts for both CC and NC
        sed -e "s|EUCALYPTUS|$EUCALYPTUS|" \
            -e "s|APACHE2_MODULE_DIR|$APACHE2_MODULE_DIR|" \
            -e "s|AXIS2C_HOME|$AXIS2C_HOME|" \
            -e "s|\(ServerRoot\).*|\1 "$HTTPD_HOME"|" \
            -e "s|EUCA_USER|$EUCA_USER|" \
            $EUCALYPTUS/etc/eucalyptus/httpd.conf \
            > $EUCALYPTUS/etc/eucalyptus/httpd-tmp.conf

# load authz if we have it (ubuntu needs it)
if [ -e $HTTPD_HOME/usr/lib/apache2/modules/mod_authz_host.so ]; then
echo "LoadModule authz_host_module /usr/lib/apache2/modules/mod_authz_host.so" >> $EUCALYPTUS/etc/eucalyptus/httpd-tmp.conf
fi

# let's configure the NC
        sed -e "s|\(Listen\).*|\1 $NC_PORT|" \
            -e "s|\(PidFile\).*|\1 $EUCALYPTUS/var/run/eucalyptus/eucalyptus-nc.pid|" \
            -e "s|\(Allow from\).*|\1 $IPS|" \
            -e "s|\(ErrorLog\).*|\1 $EUCALYPTUS/var/log/eucalyptus/httpd-nc_error_log|" \
            $EUCALYPTUS/etc/eucalyptus/httpd-tmp.conf \
            > $EUCALYPTUS/etc/eucalyptus/httpd-nc.conf
}

# crude way to start the axis2c services
do_start() {
        # check if NTPD is running and throw a fault if it is not
        if [ ! `pgrep -n ntp` ]; then
# write fault to stdout
echo
$EUCALYPTUS/usr/sbin/euca-generate-fault 1008 daemon ntp
# and to NC's fault log
$EUCALYPTUS/usr/sbin/euca-generate-fault -c nc 1008 daemon ntp
        fi

# fixes #469984
IPTABLES="`which iptables 2> /dev/null`"
if [ -n "$IPTABLES" ]; then
[ -x $IPTABLES ] && $IPTABLES -L -n > /dev/null 2> /dev/null
fi

if [ ! -x $HTTPD ]; then
echo
echo "cannot find httpd (was set to <$HTTPD>)!"
exit 1
fi
if [ ! -x $EUCALYPTUS/usr/sbin/euca_conf ]; then
echo "Some eucalyptus components are missing"
exit 1
fi

# Add loop devices if necessary (and possible)
[ -z "$CREATE_NC_LOOP_DEVICES" ] && CREATE_NC_LOOP_DEVICES=256
if [ "$CREATE_NC_LOOP_DEVICES" -gt 0 ] 2>/dev/null; then
            "$EUCALYPTUS/usr/share/eucalyptus/create-loop-devices" $CREATE_NC_LOOP_DEVICES
fi

# let's see how many loop devices we have available
LOOP_AVL_DEV="`/bin/ls -1d /dev/loop* 2>/dev/null | wc -l`"
LOOP_AVL_SYS="`/bin/ls -1d /sys/block/loop* 2>/dev/null | wc -l`"
if [ -z "$LOOP_AVL_DEV" -o "$LOOP_AVL_DEV" = "0" ]; then
echo "warning: no loop devices found in /dev; expect problems" >&2
elif [ $LOOP_AVL_DEV -lt 50 ]; then
echo "warning: found $LOOP_AVL_DEV loop devices in /dev; at least 50 are recommended" >&2
elif [ -z "$LOOP_AVL_SYS" -o "$LOOP_AVL_SYS" -lt "$LOOP_AVL_DEV" ] && [[ `uname -r` < 2.6.22 ]]; then # The version comparison does not work in every shell
# When then loop driver's max_loop option is not 0, loop device nodes
# that are not automatically created by the kernel do not work. We can
# check for this case by looking for too few loop device entries in
# sysfs.
#
# Trying to determine whether or not max_loop is 0 is difficult on
# Linux 2, so in general we make no attempt to do so. However, max_loop
# *cannot* be 0 on Linux < 2.6.22, so we perform this check on those
# systems so it will hopefully cover the majority of cases.
echo "warning: found fewer loop devices in /sys/block than in /dev ($LOOP_AVL_SYS < $LOOP_AVL_DEV); expect problems"
fi

if ! $EUCALYPTUS/usr/sbin/euca_conf --check nc ; then
exit 1
fi

# we have a program to test the hypervisor and more for the NC
if [ ! -x $EUCALYPTUS/usr/sbin/euca_test_nc ]; then
echo
echo "Cannot check Node Controller: missing euca_test_nc."
else
            # sometimes, libvirtd takes some time to start on init, so retry euca_test_nc a few times before failing
            for i in 1 2 3 4 5
            do
                PASSED=0
                if ( $EUCALYPTUS/usr/sbin/euca_test_nc $HYPERVISOR > $EUCALYPTUS/var/log/eucalyptus/euca_test_nc.log 2>&1 ); then
                    PASSED=1
                else
                    sleep 1
                fi
            done
            if ( test $PASSED = "0" ); then
                echo
                echo "Node Controller cannot be started: errors in $EUCALYPTUS/var/log/eucalyptus/euca_test_nc.log"
                exit 1
            fi
fi

# on SYSTEM or STATIC mode the bridge needs to exists
if [ "$VNET_MODE" = "SYSTEM" -o "$VNET_MODE" = "STATIC" ]; then
if [ -n "$BRCTL" -a -x $BRCTL ]; then
if ! $BRCTL show |grep $VNET_BRIDGE > /dev/null 2> /dev/null ; then
echo
echo "Warning! Cannot find bridge $VNET_BRIDGE: instances may be without net"
fi
fi
fi

# we need IP forwarding and we need to use iptable over the bridge
if [ -w /proc/sys/net/ipv4/ip_forward ]; then
VAL=`cat /proc/sys/net/ipv4/ip_forward`
if [ "$VAL" = "0" ]; then
echo
echo "Enabling IP forwarding for eucalyptus."
echo -n 1 > /proc/sys/net/ipv4/ip_forward
fi
fi
if [ -w /proc/sys/net/bridge/bridge-nf-call-iptables ]; then
VAL=`cat /proc/sys/net/bridge/bridge-nf-call-iptables`
if [ "$VAL" = "0" ]; then
echo
echo "Enabling bridge netfiltering for eucalyptus."
echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables
fi
fi

# let's be sure we have the right port for NC and CC
create_httpd_config

if [ -x $EUCALYPTUS/usr/sbin/eucanetd ]; then
            if ! $EUCALYPTUS/usr/sbin/eucanetd ; then
echo
echo "Failed to start the eucanetd"
            fi
fi

if ! $HTTPD -f $EUCALYPTUS/etc/eucalyptus/httpd-nc.conf ; then
echo
echo "Failed to start the NC!"
exit 1
fi

touch $LOCKFILE
}

do_status() {
pidfile=$EUCALYPTUS/var/run/eucalyptus/eucalyptus-nc.pid
if [ -s $pidfile ]; then
pid=`cat $pidfile 2> /dev/null`
if ps axww|grep $pid|grep httpd-nc.conf > /dev/null ; then
# we are good
return 0
fi
fi
return 1
}

do_stop() {
netpid="$EUCALYPTUS/var/run/eucalyptus/eucanetd.pid"
        if [ -f "$netpid" ]; then
            kill `cat $netpid` >/dev/null 2>&1
            rm -f $netpid
        fi

pidfile=$EUCALYPTUS/var/run/eucalyptus/eucalyptus-nc.pid

# let's be sure we are killing the right process
if ! do_status ; then
rm -f $pidfile
return
fi

# now kill the services
if [ -s $pidfile ]; then
pid=`cat $pidfile 2> /dev/null`
kill $pid > /dev/null 2>&1
else
return
fi
timeout=5
while [ $timeout -gt 0 ]; do
if ps $pid > /dev/null 2>&1 ; then
sleep 1
timeout=$(($timeout - 1))
else
break
fi
done
if [ $timeout -eq 0 ]; then
kill -9 $pid > /dev/null 2>&1
fi
rm -f $pidfile
rm -f $LOCKFILE
}

# Read configuration variable file if it is present
if [ -r $EUCALYPTUS/etc/eucalyptus/eucalyptus.conf ]; then
. $EUCALYPTUS/etc/eucalyptus/eucalyptus.conf
else
echo "Cannot find eucalyptus configuration file!"
exit 1
fi
if [ "$EUCALYPTUS" = "not_configured" ]; then
echo "EUCALYPTUS not configured!"
exit 1
fi

if [ -z "$EUCA_USER" ] ; then
EUCA_USER="root"
fi

# let's try to pick the system apache2
HTTPD="`which apache2 2> /dev/null`" # .deb based machines
if [ -z "$HTTPD" ]; then
HTTPD="`which httpd 2> /dev/null`" # .rpm based machines
fi
if [ -z "$HTTPD" ]; then
HTTPD="`which httpd2 2> /dev/null`" # newer .rpm based machines
fi
HTTPD_HOME="/"

if [ -d "@AXIS2C_HOME@" -a -e @AXIS2C_HOME@/services/EucalyptusNC ]; then
export AXIS2C_HOME="@AXIS2C_HOME@"
else
    # let's find our dependencies
    for y in $EUCALYPTUS/opt $EUCALYPTUS/packages $EUCALYPTUS /opt ; do
for x in `/bin/ls $y 2> /dev/null`; do
# this is for system or source installed
if [ "`echo $x | cut -f 1 -d -`" = "axis2c" ]; then
if [ -e $y/$x/lib/libmod_axis2.so -a \
                             -e $y/$x/services/EucalyptusNC ]; then
export AXIS2C_HOME="$y/$x"
                                break
fi
fi
done
    done
fi

if [ -z "$AXIS2C_HOME" ]; then
echo "Cannot find AXIS2C_HOME?"
exit 1
fi

# do we have the httpd daemon?
if [ -z "${HTTPD}" ]; then
echo "apache2/httpd daemon not found!"
exit 1
fi

if [ -z "${APACHE2_MODULE_DIR}" ]; then
        export APACHE2_MODULE_DIR="@APACHE2_MODULE_DIR@"
fi

if [ ! -d "$APACHE2_MODULE_DIR" ]; then
        echo "Cannot find APACHE2_MODULE_DIR?"
        exit 1
fi

# set the library path correctly
export LD_LIBRARY_PATH="$AXIS2C_HOME/lib:$AXIS2C_HOME/modules/rampart:$EUCALYPTUS/usr/lib/eucalyptus"

case "$1" in
  start)
if [ "$VERBOSE" != no ]; then
if [ "$WE_HAVE_LSB" = "Y" ]; then
log_daemon_msg "Starting $DESC" "$NAME"
else
echo -n "Starting $DESC: "
fi
fi

# let's check there is no previous NC running
if do_status ; then
echo
echo "another NC is already running!"
if [ "$VERBOSE" != no ]; then
if [ "$WE_HAVE_LSB" = "Y" ]; then
log_end_msg 1
fi
fi
exit 1
fi

rm -f /dev/shm/sem.eucalyptus-nc* /dev/shm/sem.eucalyptus-st*
do_start
case "$?" in
0|1)
if [ "$VERBOSE" != no ]; then
if [ "$WE_HAVE_LSB" = "Y" ]; then
log_end_msg 0
else
echo "done."
fi
fi
;;
*)
if [ "$VERBOSE" != no ]; then
if [ "$WE_HAVE_LSB" = "Y" ]; then
log_end_msg 1
else
echo "failed!"
fi
fi
;;
esac
;;
  stop)
if [ "$VERBOSE" != no ]; then
if [ "$WE_HAVE_LSB" = "Y" ]; then
log_begin_msg "Stopping $DESC"
else
echo -n "Stopping $DESC: "
                fi
        fi
do_stop
rm -f /dev/shm/sem.eucalyptus-nc* /dev/shm/sem.eucalyptus-st*
if [ "$VERBOSE" != no ]; then
if [ "$WE_HAVE_LSB" = "Y" ]; then
log_end_msg 0
else
echo "done."
fi
fi
;;
  restart)
if [ "$VERBOSE" != no ]; then
if [ "$WE_HAVE_LSB" = "Y" ]; then
log_begin_msg "Restarting $DESC"
else
echo -n "Restarting $DESC: "
fi
fi
# restart allow the CC to mantain the state across restart
do_stop
do_start
if [ "$VERBOSE" != no ]; then
if [ "$WE_HAVE_LSB" = "Y" ]; then
log_end_msg 0
else
echo "done."
fi
fi
;;
  status)
if do_status ; then
echo "NC is running"
else
exit 3
fi
;;
  config)
echo "EUCALYPTUS=${EUCALYPTUS}"
echo "AXIS2C_HOME=${AXIS2C_HOME}"
echo "HTTPD_HOME=${HTTPD_HOME}"
echo "HTTPD=${HTTPD}"
        ;;

  *)
echo "Usage: $NAME {start|stop|restart}" >&2
exit 3
;;
esac

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