simbamond.init

#!/bin/bash
#
# simbamond -- init interface to simbamon, a simple battery monitor
#
# Author: Hamish Cunningham <hamish@gate.ac.uk>
# Derived from Ubuntu 12.04 /etc/init.d/skeleton, July 2013.
# This code is copyright Hamish Cunningham and the University of Sheffield
# and is licenced under GPL 3 or any later version.
#
### BEGIN INIT INFO
# Provides:    simbamond
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: simbamond: a simple battery monitor daemon
# Description:       This script is the init interface to simbamon
#                    (a simple battery monitor)
### END INIT INFO

# Defaults
PATH=/sbin:/usr/sbin:/bin:/usr/bin
DESC="simbamond: a simple battery monitor daemon"
NAME=simbamon
DNAME=simbamond
DAEMON=/usr/sbin/$NAME
PIDFILE=/var/run/$DNAME.pid
SCRIPTNAME=/etc/init.d/$DNAME
START_STOP_ARGS="--pidfile ${PIDFILE} --startas ${DAEMON} --name ${NAME}"

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

# Needs to be run as root
if [ $(id -u) -ne 0 ]
then
  case "$1" in
    help|status|"")
    ;;
    *)
    echo "${DAEMON} $1 must be run as root; try 'sudo service simbamond ...'?"
    exit 1
  esac
fi

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

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

# Define LSB log_* functions.
. /lib/lsb/init-functions

# Pass on command options
get-daemon-args() { shift; DAEMON_ARGS=$*; }
get-daemon-args $*

# Function that starts the daemon/service
do_start()
{
  logger ${NAME}: starting...
  # Return
  #   0 if daemon has been started
  #   1 if daemon was already running
  #   2 if daemon could not be started
  start-stop-daemon --start $START_STOP_ARGS --test > /dev/null \
    || return 1
  start-stop-daemon --start $START_STOP_ARGS -- $DAEMON_ARGS \
    || return 2

  log_success_msg Started $NAME
}

# Function that stops the daemon/service
# Returns:
#   0 if daemon has been stopped
#   1 if daemon was already stopped
#   2 if daemon could not be stopped
#   other if a failure occurred
do_stop()
{
  logger ${NAME}: stopping...
  log_daemon_msg ${NAME}: stopping...

  # If there's no PIDFILE then either daemon hasn't been started, or 
  # it has killed itself (which it will do when MoPi triggers shutdown)
  [ -f $PIDFILE ] || {
    return 1
  }

  start-stop-daemon --stop $START_STOP_ARGS --retry=TERM/30/KILL/5
  RETVAL="$?"
  [ "$RETVAL" = 2 ] && return 2

  # Wait for children to finish too if this is a daemon that forks
  # and if the daemon is only ever run from this initscript.
  # If the above conditions are not satisfied then add some other code
  # that waits for the process to drop all resources that could be
  # needed by services started subsequently.  A last resort is to
  # sleep for some time.
  start-stop-daemon --stop $START_STOP_ARGS --quiet --oknodo --retry=0/30/KILL/5
  [ "$?" = 2 ] && return 2

  # Many daemons don't delete their pidfiles when they exit.
  rm -f $PIDFILE

  log_success_msg $NAME stopped
  return "$RETVAL"
}

# Function that sends a SIGHUP to the daemon/service
do_reload() {
  logger ${NAME}: reloading...
  #
  # 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 --name $NAME

  # we can't reload, do restart instead
  return 1
}

# Do the work
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)
  # If do_reload() is not implemented then leave this commented out
  # and leave 'force-reload' as an alias for 'restart'.
  #
  #  log_daemon_msg "Reloading $DESC" "$NAME"
  #  do_reload
  #  log_end_msg $?
  #  ;;
  restart|force-reload)
    # If the "reload" option is implemented then remove the
    # 'force-reload' alias
    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

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