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

# LSB-convention comments
# See: https://refspecs.linuxfoundation.org/LSB_5.0.0/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 hardware RTC.
### END INIT INFO

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

THIS_FILE=${0##*/}
VERSION=1.1.0
AUTHOR_NAME=imacat
AUTHOR_MAIL=imacat@mail.imacat.idv.tw
DESC="SNTP client for Virtual PC"
THIS_CONF=/etc/default/vsntp

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

BIN_PATH=/usr/sbin/vsntp
BIN_NAME=${BIN_PATH##*/}
PID_FILE=/var/run/$BIN_NAME.pid
RUN_USER=root

# default values -- do not change anything here
_DEF_SYNC_INTERVAL=900
_DEF_SCHEDULER=-s

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

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

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

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

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

status () {
  RETVAL=0
  
  start-stop-daemon --stop --signal 0 --quiet \
    --pidfile $PID_FILE --name $BIN_NAME --user $RUN_USER --exec $BIN_PATH
  RETVALS=$?
  if test $RETVALS = 0; then
    echo "$DESC $BIN_NAME is up and running ($(<$PID_FILE))."
  else
    echo "$DESC $BIN_NAME is not running (or some problem may exists)."
    RETVAL=$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: $THIS_FILE {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 information.

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

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