Crear un dimoni amb BASH Shell Script

Script per crear dimonis amb shell-bash script (provat amb GNU/Linux).

#!/bin/bash
#
# Author: Sergi Coll , 2011
#
#       This program is free software: you can redistribute it and/or modify
#       it under the terms of the GNU General Public License as published by
#       the Free Software Foundation, either version 3 of the License, or
#       (at your option) any later version.
#
#       This program is distributed in the hope that it will be useful,
#       but WITHOUT ANY WARRANTY; without even the implied warranty of
#       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#       GNU General Public License for more details.
#
#       You should have received a copy of the GNU General Public License
#       along with this program.  If not, see .
#
### BEGIN INIT INFO
# Provides:       scs
# Required-Start: $network $syslog
# Should-Start:   ssh
# Required-Stop:  $network $syslog
# Should-Stop:    sshd
# Default-Start:  3 5
# Default-Stop:   0 1 2 6
# Short-Description: BASH DAEMON TEST
# Description:    BASH DAEMON TEST
### END INIT INFO

DAEMONNAME=`basename $0`
PIDDIR=/var/run/
PIDFILE=scsdaemon.pid
TIMER=15
LOGDIR=/var/log/
LOGFILE=$DAEMONNAME.log
DATA=`date +"%h %d %H:%M:%S"`

touch -a $LOGDIR$LOGFILE 2>/dev/null

if [ "$?" != 0 ]; then
        echo "ERROR: Problems with Log $LOGDIR$LOGFILE. Exiting..."
        exit 2
fi


###########################################################################
#DAEMON FUNCTIONS
###########################################################################

function logprint {
        DATA=`date +"%h %d %H:%M:%S"`
        echo "$DATA $HOSTNAME $0[$PID] : $1" >> $LOGDIR$LOGFILE
}

###########################################################################
#DAEMON MAIN
###########################################################################

case "$1" in
        start)
                echo "Starting $0 Daemon... "
                if [ -d "$PIDDIR" ]; then
                        if [ -e "$PIDDIR$PIDFILE" ]; then
                                echo "ERROR: PID file exists perhaps daemon is running"
                                logprint "ERROR: PID file exists perhaps daemon is running"
                                exit 2
                        fi
                else
                        echo "ERROR: PID file directory don't exists"
                        logprint "ERROR: PID file directory don't exists"
                                exit 2
                fi
                (
                        PID=$BASHPID
                        echo $BASHPID >$PIDDIR$PIDFILE
                        if [ ! -e "$PIDDIR$PIDFILE" ]; then
                                echo "ERROR: creating PID file, check perminissions."
                                logprint "ERROR: PID file directory don't exists"
                                exit 2
                        fi
                        logprint "Starting $0 Daemon ..."
                        while :; do
                                sleep $TIMER;
                        done
                ) & disown -h $!
                ;;
        stop)
                echo "Stopping $0 Daemon... "
                logprint "Stopped $0 Daemon ..."
                if [ ! -e "$PIDDIR$PIDFILE" ]; then
                      echo "ERROR: PID file don't exists"
                      logprint "ERROR: PID file don't exists"
                      exit 2
                fi
                PID=`cat $PIDDIR$PIDFILE`
                kill $PID
                ps -p $PID >/dev/null
                if [ "$?" == 0 ]; then
                        echo "ERROR: process exists"
                        logprint "ERROR: process exists"
                        exit 1
                fi
                rm -f $PIDDIR$PIDFILE
                logprint "Stopped Daemon ..."
                ;;
        force-restart)
                rm -f $PIDDIR$PIDFILE
                $0 start
                ;;
        restart)
                $0 stop
                $0 start
                ;;
        status)
                if [ ! -e "$PIDDIR$PIDFILE" ]; then
                      echo "ERROR: PID file don't exists, perhaps don't running"
                      exit 2
                fi
                PID=`cat $PIDDIR$PIDFILE`
                ps -p $PID
                if [ "$?" != 0 ]; then
                        echo "ERROR: PID file exists but process no."
                        echo "Removing PID file"
                        rm -f $PIDDIR$PIDFILE
                        exit 1
                fi
                ;;
        *)
                echo "Usage: $0 {start|stop|status|force-restart|restart}"
                exit 1
                ;;
esac
print

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