vimeo Graph-Explorer init.d script

#!/bin/bash
### BEGIN INIT INFO
# Provides:          graph-explorer
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Graph-Explorer server
# Description:       Stateless graph explorer server
### END INIT INFO

# Author: Eguene Klimov <bloodjazman@gmail.com>

# Do NOT "set -e"

# PATH should only include /usr/* if it runs after the mountnfs.sh script
PATH=/sbin:/usr/sbin:/bin:/usr/bin:/usr/local/bin
DESC="Graph Explorer"
NAME=graph-explorer
DAEMON=/usr/local/bin/gunicorn
DAEMON_ARGS="graph_explorer.app:'default_app()' -w 4 -b 0.0.0.0:9999"
DAEMON_USER=graphite
PIDFILE=/var/run/graph-explorer.pid
SCRIPTNAME=/etc/init.d/$NAME

# Exit if the package is not installed
[ -x "$DAEMON" ] || 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 (>= 3.2-14) to ensure that this file is present
# and status_of_proc is working.
. /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
  pid=$( pidofproc -p $PIDFILE "$NAME")
  if [ -n "$pid" ] ; then
    log_daemon_msg "$DESC is already running (PID `cat ${PIDFILE}`)"
    return 1
  fi

  echo "cd / && $DAEMON $DAEMON_ARGS"
  cd / && $DAEMON $DAEMON_ARGS
  [ "$?" != "0" ] && return 2
  #start-stop-daemon --start --verbose --chuid $DAEMON_USER --chdir / --make-pidfile --background --pidfile $PIDFILE --exec $DAEMON -- $DAEMON_ARGS || return 2
  # Add code here, if necessary, that waits for the process to be ready
  # to handle requests from services started subsequently which depend
  # on this one.  As a last resort, sleep for some time.
}

# 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/30/KILL/5 --pidfile $PIDFILE
  RETVAL="$?"
  [ "$RETVAL" = 2 ] && return 2

  if [ -r $PIDFILE ]; then
    log_daemon_msg "kill all processes from $PIDFILE"
    PIDLIST=`cat $PIDFILE`
    if [ -n "$PIDLIST" ]; then
      kill -QUIT $PIDLIST
      STATUS=`ps h --pid $PIDLIST | wc -l`
      [ "$STATUS" != 0 ] && return 2
    fi
  fi
  return 0
}

# 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 --quiet --signal HUP --pidfile $PIDFILE
  return $?
}

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) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
  esac
  ;;
  status)
    status_of_proc "$DAEMON" "$NAME" && exit 0 || exit $?
    ;;
  reload|force-reload)
    log_daemon_msg "Reloading $DESC" "$NAME"
    do_reload
    log_end_msg $?
    ;;
  restart)
    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|reload|force-reload}" >&2
  exit 3
  ;;
esac

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