#!/bin/bash
 
# Licence: GPLv3, MIT, BSD, Apache or whatever you prefer; FREE to use, modify, copy, no obligations
# Description: Bash Script to Start the process with NOHUP and & - in background, pretend to be a Daemon
# Author: Andrew Bikadorov
# Script v1.5
 
# For debugging purposes uncomment next line
#set -x
 
# Config, can be altered
APP_NAME="Yona"
APP_FILENAME="yona"
APP_PID="/var/run/$APP_FILENAME.pid"
APP_PATH="/home/yona/bin" # 이 경로를 알맞게 수정해주세요
APP_FILE=$APP_FILENAME
APP_LOGS=$APP_PATH"/logs"
APP_PRE_OPTION=""
APP_POST_OPTION=""
 
# Should Not Be altered
TMP_FILE="/tmp/status_$APP_FILENAME"
### For internal usage
STATUS_CODE[0]="Is Running"
STATUS_CODE[1]="Not Running"
STATUS_CODE[2]="Stopped incorrectly"
STATUS_CODE[9]="Default Status, should not be seen"
 
start() {
   
    checkpid
    STATUS=$?
    if [ $STATUS -ne 0 ] ;
    then
        echo "Starting $APP_NAME..."
        nohup $APP_PRE_OPTION $APP_PATH/$APP_FILE $APP_POST_OPTION > $APP_LOGS/$APP_FILENAME.out 2> $APP_LOGS/$APP_FILENAME.err < /dev/null &
        # You can un-comment next line to see what command is exactly executed
        # echo "nohup $APP_PRE_OPTION $APP_PATH/$APP_FILE $APP_POST_OPTION > $APP_LOGS/$APP_FILENAME.out 2> $APP_LOGS/$APP_FILENAME.err < /dev/null &"
        echo PID $!
        echo $! > $APP_PID
       
        statusit
        #echo "Done"
    else
        echo "$APP_NAME Already Running"
    fi
}
 
stop() {
    checkpid
    STATUS=$?
    if [ $STATUS -eq 0 ] ;
    then
        echo "Stopping $APP_NAME..."
        kill `cat $APP_PID`
        rm $APP_PID
        statusit
        #echo "Done"
    else
        echo "$APP_NAME - Already killed"
    fi
}
 
checkpid(){
    STATUS=9
   
    if [ -f $APP_PID ] ;
    then
        #echo "Is Running if you can see next line with $APP_NAME"
        ps -Fp `cat $APP_PID` | grep $APP_FILE > $TMP_FILE
        if [ -f $TMP_FILE -a -s $TMP_FILE ] ;
            then
                STATUS=0
                #"Is Running (PID `cat $APP_PID`)"
            else
                STATUS=2
                #"Stopped incorrectly"
            fi
       
        ## Clean after yourself
        rm -f $TMP_FILE
    else
        STATUS=1
        #"Not Running"
    fi
   
    return $STATUS
}
 
statusit() {
    #TODO
    #status -p $APP_PID ghost
    checkpid
    #GET return value from previous function
    STATUS=$?
    #echo $?
   
    EXITSTATUS=${STATUS_CODE[STATUS]}
   
    if [ $STATUS -eq 0 ] ;
    then
        EXITSTATUS=${STATUS_CODE[STATUS]}" (PID `cat $APP_PID`)"
    fi
   
    #echo "First Index: ${NAME[0]}"
    #echo "Second Index: ${NAME[1]}"
   
    echo $APP_NAME - $EXITSTATUS
    #${STATUS_CODE[STATUS]}
   
}
 
 
 
case "$1" in
 
    'start')
        start
        ;;
 
    'stop')
        stop
        ;;
 
    'restart')
        stop
        start
        ;;
 
    'status')
        statusit
        ;;
       
    *)
        echo "Usage: $0 { start | stop | restart | status }"
        exit 1
        ;;
esac
 
exit 0