#!/bin/sh
# /etc/init.d/metabase
### BEGIN INIT INFO
# Provides:          Metabase
# Required-Start:    $local_fs $network $named $time $syslog
# Required-Stop:     $local_fs $network $named $time $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Description:       Metabase analytics and intelligence platform
### END INIT INFO

# where is the Metabase jar located?
METABASE=/opt/metabase/metabase.jar

# where will our environment variables be stored?
METABASE_CONFIG=/etc/default/metabase

# which (unprivileged) user should we run Metabase as?
RUNAS=metabase

# where should we store the pid/log files?
PIDFILE=/var/run/metabase.pid
LOGFILE=/var/log/metabase.log

start() {
  # ensure we only run 1 Metabase instance
  if [ -f "$PIDFILE" ] && kill -0 $(cat "$PIDFILE"); then
    echo 'Metabase already running' >&2
    return 1
  fi
  echo 'Starting Metabase...' >&2
  # execute the Metabase jar and send output to our log
  local CMD="nohup java -jar \"$METABASE\" &> \"$LOGFILE\" & echo \$!"
  # load Metabase config before we start so our env vars are available
  . "$METABASE_CONFIG"
  # run our Metabase cmd as unprivileged user
  su -c "$CMD" $RUNAS > "$PIDFILE"
  echo 'Metabase started.' >&2
}

stop() {
  # ensure Metabase is running
  if [ ! -f "$PIDFILE" ] || ! kill -0 $(cat "$PIDFILE"); then
    echo 'Metabase not running' >&2
    return 1
  fi
  echo 'Stopping Metabase ...' >&2
  # send Metabase TERM signal
  kill -15 $(cat "$PIDFILE") && rm -f "$PIDFILE"
  echo 'Metabase stopped.' >&2
}

uninstall() {
  echo -n "Are you really sure you want to uninstall Metabase? That cannot be undone. [yes|No] "
  local SURE
  read SURE
  if [ "$SURE" = "yes" ]; then
    stop
    rm -f "$PIDFILE"
    rm -f "$METABASE_CONFIG"
    # keep logfile around
    echo "Notice: log file is not be removed: '$LOGFILE'" >&2
    update-rc.d -f metabase remove
    rm -fv "$0"
  fi
}

case "$1" in
  start)
    start
    ;;
  stop)
    stop
    ;;
  uninstall)
    uninstall
    ;;
  retart)
    stop
    start
    ;;
  *)
    echo "Usage: $0 {start|stop|restart|uninstall}"
esac