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Bash

Expertise (3/5)

Incontournables sous Linux : Bash. J'ai depuis longtemps abandonné Bash au profit de Perl pour le développement de scripts... Cela dit, je l'utilise de temps en temps pour l'écriture de "scripts de démarrage" (sous "/etc/init.d") pour certaines fonctions systèmes.

Squelette de script de démarrage
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Squelette de script de démarrage

#!/bin/bash
#
#       /etc/rc.d/init.d/
#

## ---------------------------------------------------------------------------
## General configuration
## WARNING: The following values are also defined into the manager's
##          configuration file.
##          /home/services/server-manager/conf/server-manager.conf
## ---------------------------------------------------------------------------

PIDFILE=/home/services/server-manager/control/server-manager.pid
STOPFILE=/home/services/server-manager/control/server-manager.stop
MANAGER=/home/services/server-manager/batch/serverManager.pl

## ---------------------------------------------------------------------------
## This function returns 0 if the Server manager is not running.
## Otherwise, it returns a non non zero value.
## ---------------------------------------------------------------------------

status() {
        local V=`/bin/ps awx | /bin/egrep --regexp='[0-9]+:[0-9]+ +.+perl +.+serverManager\.pl *$' | /usr/bin/wc -l`
        return $V
}

## ---------------------------------------------------------------------------
## This function waits until the Server manager stops.
## ---------------------------------------------------------------------------

waitstop() {
        local V=1
        while [ $V -gt 0 ]; do
                /bin/sleep 1
                status
                let V=$?
                /bin/echo -n "."
        done
        /bin/echo
}

## ---------------------------------------------------------------------------
## This function starts the Server manager.
## ---------------------------------------------------------------------------

start() {
        /bin/echo "Starting : "

        # Make sure that the PID file does not exist
        if [ -f $PIDFILE ]; then
                /bin/echo "WARNING: PID file exists. The Server manager may be running."
                status
                if [ $? -gt 0 ]; then
                        /bin/echo "WARNING: The Server manager is already running."
                        return
                fi
                /bin/echo "The Server manager is not running. Removing the PID file."
                /bin/rm $PIDFILE
        fi

        # Make sure that the STOP file does not exist
        if [ -f $STOPFILE ]; then
                /bin/echo "WARNING: STOP file STOPFILE exists. Remove it..."
                /bin/rm $STOPFILE
        fi

        # Starting the daemon
        /usr/bin/perl $MANAGER
        # wait few seconds...
        /bin/sleep 1
        return
}

## ---------------------------------------------------------------------------
## This function stops the Server manager.
## ---------------------------------------------------------------------------

stop() {
        /bin/echo "Shutting down : "

        status
        if [ $? -eq 0 ]; then
                /bin/echo "The Server manager is not running."
                /bin/echo "Cleaning control files (STOP and PIF)."
                /bin/rm -f $PIDFILE
                /bin/rm -f $STOPFILE
                return
        fi

        if [ -f $STOPFILE ]; then
                /bin/echo "WARNING: STOP file STOPFILE already exists."
                /bin/echo "Server manager should not be running."
                /bin/echo "Something is wrong with the manager."
        else
                /bin/echo "Creating STOP file $STOPFILE."
                /bin/touch $STOPFILE
                /bin/echo "Please wait until total termination."
                waitstop
        fi
        return
}

## ---------------------------------------------------------------------------
## Execute the command
## ---------------------------------------------------------------------------

case "$1" in
    start)
        start
        ;;
    stop)
        stop
        ;;
    status)
        status
        if [ $? -gt 0 ]; then
                /bin/echo "Server is running."
        else
                /bin/echo "Server is not running."
        fi
        ;;
    restart)
        stop
        start
        ;;
    reload)
        stop
        start
        ;;
    *)
        /bin/echo "Usage:  {start|stop|status|reload|restart}"
        exit 1
        ;;
esac
exit $?

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