#!/bin/sh
# start and stop the SNTP client for Virtual PC

# LSB-convension comments
# See: http://refspecs.freestandards.org/LSB_3.1.0/LSB-Core-generic/LSB-Core-generic/initscrcomconv.html
### BEGIN INIT INFO
# Provides:          vsntp
# Required-Start:    $network $time
# Required-Stop:     
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: start and stop the SNTP client for Virtual PC
# Description:       vsntp is a SNTP client for Virtual PC that synchronize
#                    time periodically for systems without hardward RTC.
### END INIT INFO

export PATH=/sbin:/bin:/usr/sbin:/usr/bin

THISFILE=${0##*/}
VERSION=1.1.0
AUTHORNAME=imacat
AUTHORMAIL=imacat@mail.imacat.idv.tw
DESC="SNTP client for Virtual PC"
THISCONF=/etc/default/vsntp

# source the configuration
test -e $THISCONF && . $THISCONF
case "$SCHEDULER" in
alarm|a|-a|--alarm)
  SCHEDULER=-a ;;
*)
  SCHEDULER=-s ;;
esac

BINPATH=/usr/sbin/vsntp
BINNAME=${BINPATH##*/}
PIDFILE=/var/run/$BINNAME.pid
RUNUSER=root

# default values -- do not change anything here
_DEFSYNC_INTERVAL=900
_DEFSCHEDULER=-s

# startup options
OPTS=""
test -n "$SCHEDULER" -a "$SCHEDULER" != "$_DEFSCHEDULER" && OPTS="$OPTS $SCHEDULER"
test -n "$SYNC_INTERVAL" -a "$SYNC_INTERVAL" != "$_DEFSYNC_INTERVAL" && OPTS="$OPTS -i $SYNC_INTERVAL"
OPTS="$OPTS $SERVER"

# sanity checks
if test ! -n "$SERVER"; then
  echo "$THISFILE: You must set the SERVER in $THISCONF" >&2
  exit 1
fi
if test ! -x $BINPATH; then
  echo "$THISFILE: Missing valid daemon program at $BINPATH" >&2
  exit 1
fi
if test -n "$USER" -a ! "$USER" = "root"; then
  echo "$THISFILE: You need to be root to run this script." >&2
  exit 1
fi

start () {
  echo -n "Starting $DESC:"
  RETVAL=0
  
  echo -n " $BINNAME"
  start-stop-daemon --start --startas $BINPATH --quiet \
    --pidfile $PIDFILE --name $BINNAME --user $RUNUSER --exec $BINPATH -- $OPTS
  RETVALS=$?
  test $RETVALS = 0 || { echo -n ":failed"; RETVAL=$RETVALS; }
  
  echo "."
  return $RETVAL
}

stop () {
  echo -n "Stopping $DESC:"
  RETVAL=0
  
  echo -n " $BINNAME"
  start-stop-daemon --stop --quiet \
    --pidfile $PIDFILE --name $BINNAME --user $RUNUSER --exec $BINPATH
  RETVALS=$?
  test $RETVALS = 0 || { echo -n ":failed"; RETVAL=$RETVALS; }
  rm -f $PIDFILE
  
  echo "."
  return $RETVAL
}

restart () {
  stop
  sleep 1
  start
  RETVAL=$?
  return $RETVAL
}

status () {
  RETVAL=0
  
  start-stop-daemon --stop --signal 0 --quiet \
    --pidfile $PIDFILE --name $BINNAME --user $RUNUSER --exec $BINPATH
  RETVALS=$?
  if test $RETVALS = 0; then
    echo "$DESC $BINNAME is up and running ($(<$PIDFILE))."
  else
    echo "$DESC $BINNAME is not running (or some problem may exists)."
    RETVAL=$RETVALS
  fi
  
  return $RETVAL
}

# parse the arguments
while test $# != 0; do
  case "$1" in
  start|stop|restart|force-reload|status)
    action="$1"
    ;;
  -h|--help)
    cat << EOF
Start and/or stop the $DESC
Usage: $THISFILE {start|stop|restart|force-reload|status}

  start          Start the daemon.
  stop           Stop the daemon.
  restart        Stop and restart the daemon.
  force-reload   Enforce a reload to the configuration file.
  status         Display the daemon status.
  -h,--help      Display this help.
  -v,--version   Display the version infomation.

Report bugs to $AUTHORNAME <$AUTHORMAIL>
EOF
    exit 0
    ;;
  -v|--version)
    cat << EOF
$THISFILE version $VERSION by $AUTHORNAME <$AUTHORMAIL>
EOF
    exit 0
    ;;
  *)
    echo "$THISFILE: unrecognized argument: $1" >&2
    echo "Try \`$THISFILE --help' for more infomation" >&2
    exit 1
    ;;
  esac
  shift
done

# no action specified
if test -z "$action"; then
  echo "$THISFILE: what do you want to do now?" >&2
  echo "Try \`$THISFILE --help' for more infomation" >&2
  exit 1
fi

# act now!
case "$action" in
start)
  start
  RETVAL=$?
  ;;
stop)
  stop
  RETVAL=$?
  ;;
restart|force-reload)
  restart
  RETVAL=$?
  ;;
status)
  status
  RETVAL=$?
  ;;
esac

exit $RETVAL