runtool

#!/bin/bash
#
#: Filename    : runtool.sh
#: Title       : runtool
#: Author      : "Iarmin" <[email protected]>
#: Version     : 0.1
#: Description : Adding service like control to your scripts. Easy to implement.
#: Dependency  : none
#: Usage       : Place the following code into the beginning of your script
#
# PIDFILE="/tmp/yourprogram.lock"  # the pidfile path
# source ./runtool.sh
#
# # ... and here comes your code
#

runtools_usage() {
    echo "Usage: $0 [start|stop|restart|status}"
    exit 1
}

process_exists() {
    if [ -n "$1" ] && [ -d "/proc/$1" ]; then
        return 0
    else
        return 1
    fi
}

if [ -z "$1" ]; then
    runtools_usage
fi

if [ -z "$PIDFILE" ]; then
    echo "No \$PIDFILE set"
    exit 2
fi

case "$1" in
    "start")
        echo 'Starting...'
        if process_exists "$(cat $PIDFILE 2> /dev/null)"; then
            echo "  Already running!"
            exit 3
        fi
        ( $0 daemon & ) &> /dev/null
        exit 0
    ;;
    "stop")
        echo 'Stopping...'
        if process_exists "$(cat $PIDFILE 2> /dev/null)" ; then
            _PID="$(cat $PIDFILE 2> /dev/null)"
            kill "$_PID"
            sleep 1
            if process_exists "$_PID"; then
                kill -9 "$_PID"
            fi
            exit 0
        else
            echo "  Not running!"
            exit 4
        fi
        exit 0
    ;;
    "restart")
        $0 stop
        sleep 1
        $0 start
        exit 0
    ;;
    "daemon")
        DAEMON=1
        echo "$$" > "$PIDFILE"
    ;;
    "status")
        if process_exists "$(cat $PIDFILE 2> /dev/null)"; then
            echo "running: $(cat $PIDFILE 2> /dev/null)"
        else
            echo "not running"
        fi
        exit 0
    ;;
    *)
        runtools_usage
    ;;
esac

if [ "$DAEMON" != "1" ]; then
    exit
fi