init script for vcap components

gistfile1.sh

#! /bin/sh
### BEGIN INIT INFO
# Provides:          nats_server
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Description:       Starts the nats message bus server
### END INIT INFO
export RUBY_PATH=/home/ubuntu/.rvm/rubies/ruby-1.9.2-p180
export GEM_PATH=/home/ubuntu/.rvm/gems/ruby-1.9.2-p180
EXEC_USER=ubuntu
COMPONENT=router
CF_ROOT=/home/ubuntu/cloudfoundry/vcap
CONFIG_PATH=/home/ubuntu/cloudfoundry/config/$COMPONENT.yml
SCRIPT_PATH=$CF_ROOT/$COMPONENT/bin/$COMPONENT

PATH=$CF_ROOT/$COMPONENT/bin:$RUBY_PATH/bin:$GEM_PATH/bin:/sbin:/usr/sbin:/bin:/usr/bin
DESC="vcap-$COMPONENT"
NAME="vcap-$COMPONENT"
DAEMON=$RUBY_PATH/bin/ruby 
DAEMON_NAME=ruby
DAEMON_ARGS="$SCRIPT_PATH -c $CONFIG_PATH"

PIDFILE=/var/vcap/sys/run/router.pid
SCRIPTNAME=/etc/init.d/$NAME

# Exit if the package is not installed
[ -x "$SCRIPT_PATH" ] || exit 0

# Read configuration variable file if it is present
[ -r /etc/default/$NAME ] && . /etc/default/$NAME

# Load the VERBOSE setting and other rcS variables
. /lib/init/vars.sh

# Define LSB log_* functions.
# Depend on lsb-base (>= 3.0-6) to ensure that this file is present.
. /lib/lsb/init-functions

#
# Function that starts the daemon/service
#
do_start()
{
    # Return
    #   0 if daemon has been started
    #   1 if daemon was already running
    #   2 if daemon could not be started
    start-stop-daemon --start --user $EXEC_USER --chuid $EXEC_USER \
                      --quiet --pidfile $PIDFILE --exec $DAEMON --test > /dev/null \
        || return 1
    start-stop-daemon --start --user $EXEC_USER --chuid $EXEC_USER \
                      --quiet --pidfile $PIDFILE --exec $DAEMON --background -- \
        $DAEMON_ARGS || return 2
}

#
# Function that stops the daemon/service
#
do_stop()
{
    # Return
    #   0 if daemon has been stopped
    #   1 if daemon was already stopped
    #   2 if daemon could not be stopped
    #   other if a failure occurred
    start-stop-daemon --stop --quiet --retry=TERM/5/KILL/5 --pidfile $PIDFILE --name $DAEMON_NAME
    RETVAL="$?"
    [ "$RETVAL" = 2 ] && return 2

    start-stop-daemon --stop --quiet --oknodo --retry=0/10/KILL/5 --pidfile $PIDFILE --exec $DAEMON
    [ "$?" = 2 ] && return 2 
    rm -f $PIDFILE
    return "$RETVAL"
}

#
# Function that sends a SIGHUP to the daemon/service
#
do_reload() {
    #
    # If the daemon can reload its configuration without
    # restarting (for example, when it is sent a SIGHUP),
    # then implement that here.
    #
    start-stop-daemon --stop --signal 1 --quiet --pidfile $PIDFILE 
    return 0
}

case "$1" in
  start)
    [ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$NAME"
    do_start
    case "$?" in
        0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
        2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
    esac
    ;;
  stop)
    [ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$NAME"
    do_stop
    case "$?" in
        0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
        2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
    esac
    ;;
  status)
       status_of_proc -p $PIDFILE "$DAEMON" "$NAME" && exit 0 || exit $?
       ;;
  restart|force-reload)
    log_daemon_msg "Restarting $DESC" "$NAME"
    do_stop
    case "$?" in
      0|1)
        do_start
        case "$?" in
            0) log_end_msg 0 ;;
            1) log_end_msg 1 ;; # Old process is still running
            *) log_end_msg 1 ;; # Failed to start
        esac
        ;;
      *)
          # Failed to stop
        log_end_msg 1
        ;;
    esac
    ;;
  *)
    echo "Usage: $SCRIPTNAME {start|stop|status|restart|force-reload}" >&2
    exit 3
    ;;
esac