Instalación del servidor CDO como servicio en Linux

Para instalar el servidor de CDO como servicio en Linux al inicio (usando SysV por ejemplo) se proporciona el script /etc/init.d/cdo.

Configuración

En un sistema compatible con Debian/GNU Linux el escript abajo proporcionado se debe colocar en /etc/init.d/cdo, con permisos ejecutables.

Una vez el script se ha colocado, el servicio se puede iniciar/parar/reiniciar con los argumentos start/stop/restart. Por ejemplo:

$ /etc/init.d/cdo start

$ service cdo start

Para lanzar y parar el servicio con el arranque y apagado del sistema, se puede hacer uso del comando update-rc.d.

Para instalar el servicio basta ejecutar:

update-rc.d cdo defaults

Y para desinstalarlo:

update-rc.d cdo remove

Script: /etc/init.d/cdo

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

### BEGIN INIT INFO
# Provides:             cdo-server 1.1
# Required-Start:       $all
# Required-Stop:        $all
# Should-Start:         $syslog
# Should-Stop:          $syslog
# Default-Start:        2 3 4 5
# Default-Stop:         0 1 6
# Short-Description:    DPLfw CDO server
### END INIT INFO


# This script starts and stops the CDO server in background, and attaches
# the OSGi console to port 23. The OSGi console can be controlled via telnet.

# Must be run after other services have been started to
# ensure that the server is able to create a connection

# Some things that run always

LOCK=/run/lock/cdo.pid
SVCDIR=/opt/cdo-server/linux.gtk.x86-1.1/eclipse/
FIFO=/run/lock/cdo.fifo

# Error codes
ERUNNING=10
ENORUNNING=20

echoerr() {
  echo "$@" 1>&2;
}

chkrunning() {
  if [ -e $LOCK ]; then
    # LOCK exists, check PID
    # Get saved PID
    PID=$(cat $LOCK)
    # Get nameof the binary running with pid $PID
    PROCPID=$(ps -p $PID -o comm --no-headers)
    # If process with pid $PID is cdo-server, the service is running
    if [ "$PROCPID" == "cdo-server" ]; then
      return $ERUNNING
    else
      return $ENORUNNING
    fi
  else
    # LOCK does not exist, not running
    return $ENORUNNING
  fi
}

dostart() {

  # AL CREATED FILES WIL BE ONLY ACCESIBLE BY ROOT
  umask 077
  ################################################

  cd $SVCDIR

  # Check if server is running
  chkrunning
  if [ $? -eq $ERUNNING  ]; then
    return $ERUNNING
  fi

  # At this point no other live instance of cdo-server
  # should hold the LOCK and the FIFO
  # However, this is not always true if an unexpected error
  # has ocurred.
  # If any other instance of the cdo service is still running,
  # the LOCK file will be reset and the FIFO disconnected

  # Unlink any existing FIFO silently
  # and create a new one
  unlink $FIFO > /dev/null 2>&1
  mkfifo $FIFO

  # Move to server dir (required to resolve config files)
  cd $SVCDIR

  # Start service in background
  $SVCDIR/cdo-server -console 23 > $FIFO 2>&1 &
  NEWPID=$!

  # Save the new PID to LOCK
  echo $NEWPID > $LOCK

  # Monitor server output from FIFO until server is loaded
  awk -v PID=$NEWPID '{
    print $0;
    if ($0 == "[INFO] CDO server started") {
      exit 0;
    } else if ($1 == "[ERROR]") {
      print "An error ocurred, killing process!";
      system("kill -9 " PID);
      exit 1;
    }
  }' $FIFO

  # The AWK command detected an error!
  if [ $? -ne 0 ]; then
    # If there are no instances of cdo-server running
    # (for example, the service failed to start when invoked by
    # rc.d boot scripts), delete the LOCK and the FIFO
    CDOSRVRUNNING=$(ps -C cdo-server)
    if [ $CDOSRVRUNNING ]; then
      rm -f $LOCK
      rm -f $FIFO
    fi
  fi

}

dostop() {

  # Check if server is running
  chkrunning
  if [ $? -eq $ERUNNING ]; then
      echo -e "\nclose" | telnet localhost &> /dev/null &
      cat $FIFO
      rm $LOCK
      unlink $FIFO
  else
    return $ENORUNNING
  fi
}

# Carry out specific functions when asked to by the system
case "$1" in
  start)
    dostart
    if [ $? -eq $ERUNNING ]; then
      echoerr "CDO service already running!"
    fi
    ;;
  stop)
    dostop
    if [ $? -eq $ENORUNNING ]; then
      echoerr "CDO service not running!"
    fi
    ;;
  restart)
    dostop
    dostart
    ;;
  *)
    echo "Usage: /etc/init.d/cdo {start|stop|restart}"
    exit 1
    ;;
esac

exit 0