#!/bin/bash
#/**
#@file    opengnsys_update.sh
#@brief   Script actualización de OpenGnsys
#@version 0.9 - basado en opengnsys_installer.sh
#@author  Ramón Gómez - ETSII Univ. Sevilla
#@date    2010/01/27
#@version 1.0 - adaptación a OpenGnSys 1.0
#@author  Ramón Gómez - ETSII Univ. Sevilla
#@date    2011/03/02
#@version 1.0.1 - control de auto actualización del script
#@author  Ramón Gómez - ETSII Univ. Sevilla
#@date    2011/05/17
#@version 1.0.2a - obtiene valor de dirección IP por defecto
#@author  Ramón Gómez - ETSII Univ. Sevilla
#@date    2012/01/18
#@version 1.0.3 - Compatibilidad con Debian y auto configuración de acceso a BD.
#@author  Ramón Gómez - ETSII Univ. Sevilla
#@date    2012/03/12
#@version 1.0.4 - Detector de distribución y compatibilidad con CentOS.
#@author  Ramón Gómez - ETSII Univ. Sevilla
#@date    2012/05/04
#@version 1.0.5 - Actualizar BD en la misma versión, compatibilidad con Fedora (systemd) y configuración de Rsync.
#@author  Ramón Gómez - ETSII Univ. Sevilla
#@date    2014/04/03
#@version 1.0.6 - Redefinir URLs de ficheros de configuración usando HTTPS.
#@author  Ramón Gómez - ETSII Univ. Sevilla
#@date    2015/03/12
#@version 1.1.0 - Instalación de API REST y configuración de zona horaria.
#@author  Ramón Gómez - ETSII Univ. Sevilla
#@date    2015/11/09
#@version 1.1.1a - Elegir versión a actualizar.
#@author  Ramón Gómez - ETSII Univ. Sevilla
#@date    2019/12/13
#*/


####  AVISO: NO EDITAR variables de configuración.
####  WARNING: DO NOT EDIT configuration variables.
INSTALL_TARGET=/opt/opengnsys		# Directorio de instalación
PATH=$PATH:$INSTALL_TARGET/bin
OPENGNSYS_CLIENTUSER="opengnsys"	# Usuario Samba


# Sólo ejecutable por usuario root
if [ "$(whoami)" != 'root' ]; then
        echo "ERROR: this program must run under root privileges!!"
        exit 1
fi
# Error si OpenGnsys no está instalado (no existe el directorio del proyecto)
if [ ! -d $INSTALL_TARGET ]; then
        echo "ERROR: OpenGnsys is not installed, cannot update!!"
        exit 1
fi

source $INSTALL_TARGET/lib/ogfunctions.sh || exit 1

echo -n "Current version: "
if [ -r $INSTALL_TARGET/doc/VERSION.json ]; then
	jq -j '"OpenGnsys", .version, " ", .release' $INSTALL_TARGET/doc/VERSION.json
else
	cat $INSTALL_TARGET/doc/VERSION.txt
fi

echo -e "\nThe OpenGnsys version 1.2.0 was tested with full functionality on Ubuntu 18.04 with PHP 7.2."
echo " * If the update is made from a version prior to 1.1.1c, you must disable strict mode in mysql by adding in the configuration file: sql_mode = NO_ENGINE_SUBSTITUTION"
echo " * If you are going to perform an update from version 1.1.0, it is necessary to start with the operating system, moving it from Ubuntu 16.04 to Ubuntu 18.04, and then perform the OpenGnsys update."

echo -e -n "\nDo you want to continue? [y/N]: "
read -r GO_ON
if [ "${GO_ON^^}" != "Y" ]; then
        echo "We left the installation." && exit
fi

# Cargar configuración de acceso a la base de datos.
if [ -r $INSTALL_TARGET/etc/ogserver.json ]; then
	source_json_config $INSTALL_TARGET/etc/ogserver.json
elif [ -r $INSTALL_TARGET/etc/ogserver.cfg ]; then
	source $INSTALL_TARGET/etc/ogserver.cfg
elif [ -r $INSTALL_TARGET/etc/ogAdmServer.cfg ]; then
	source $INSTALL_TARGET/etc/ogAdmServer.cfg
fi
OPENGNSYS_DATABASE=${OPENGNSYS_DATABASE:-"$CATALOG"}		# Base de datos
OPENGNSYS_DBUSER=${OPENGNSYS_DBUSER:-"$USUARIO"}		# Usuario de acceso
OPENGNSYS_DBPASSWORD=${OPENGNSYS_DBPASSWORD:-"$PASSWORD"}	# Clave del usuario
if [ -z "$OPENGNSYS_DATABASE" -o -z "$OPENGNSYS_DBUSER" -o -z "$OPENGNSYS_DBPASSWORD" ]; then
	echo "ERROR: set OPENGNSYS_DATABASE, OPENGNSYS_DBUSER and OPENGNSYS_DBPASSWORD"
	echo "       variables, and run this script again."
	exit 1
fi

# Comprobar si se ha descargado el paquete comprimido (REMOTE=0) o sólo el instalador (REMOTE=1).
PROGRAMDIR=$(readlink -e $(dirname "$0"))
PROGRAMNAME=$(basename "$0")
OPENGNSYS_SERVER="opengnsys.es"
if [ -d "$PROGRAMDIR/../installer" ]; then
	REMOTE=0
else
	REMOTE=1
fi

WORKDIR=/tmp/opengnsys_update
mkdir -p $WORKDIR

# Registro de incidencias.
OGLOGFILE=$INSTALL_TARGET/log/${PROGRAMNAME%.sh}.log 
LOG_FILE=/tmp/$(basename $OGLOGFILE) 



#####################################################################
####### Algunas funciones útiles de propósito general:
#####################################################################

# Generar variables de configuración del actualizador
# Variables globales:
# - OSDISTRIB - distribución Linux
# - DEPENDENCIES - array de dependencias que deben estar instaladas
# - UPDATEPKGLIST, INSTALLPKGS, CHECKPKG - comandos para gestión de paquetes
# - APACHECFGDIR, APACHESERV, PHPFPMSERV, DHCPSERV, MYSQLSERV, MYSQLCFGDIR, INETDCFGDIR - configuración y servicios

function autoConfigure()
{
	local service

	# Detectar sistema operativo del servidor (compatible con fichero os-release y con LSB).
	if [ -f /etc/os-release ]; then
		source /etc/os-release
		OSDISTRIB="$ID"
		OSVERSION="$VERSION_ID"
	else
		OSDISTRIB=$(lsb_release -is 2>/dev/null)
		OSVERSION=$(lsb_release -rs 2>/dev/null)
	fi
	# Convertir distribución a minúsculas y obtener solo el 1er número de versión.
	OSDISTRIB="${OSDISTRIB,,}"
	OSVERSION="${OSVERSION%%.*}"

	# Configuración según la distribución de Linux.
	if [ -f /etc/debian_version ]; then
		# Distribución basada en paquetes Deb.
		DEPENDENCIES=( curl rsync btrfs-tools procps arp-scan realpath php-curl gettext moreutils jq wakeonlan udpcast libev-dev libjansson-dev libssl-dev shim-signed grub-efi-amd64-signed php-fpm gawk libdbi-dev libdbi1 libdbd-mysql automake liblz4-tool software-properties-common )
		# Paquete correcto para realpath.
		[ -z "$(apt-cache pkgnames realpath)" ] && DEPENDENCIES=( ${DEPENDENCIES[@]//realpath/coreutils} )
		UPDATEPKGLIST="add-apt-repository -y ppa:ondrej/php; apt-get update"
		INSTALLPKGS="apt-get -y install"
		DELETEPKGS="apt-get -y purge"
		CHECKPKG="dpkg -s \$package 2>/dev/null | grep -q \"Status: install ok\""
		if which service &>/dev/null; then
			STARTSERVICE="eval service \$service restart"
			STOPSERVICE="eval service \$service stop"
			SERVICESTATUS="eval service \$service status"
		else
			STARTSERVICE="eval /etc/init.d/\$service restart"
			STOPSERVICE="eval /etc/init.d/\$service stop"
			SERVICESTATUS="eval /etc/init.d/\$service status"
		fi
		ENABLESERVICE="eval systemctl enable \$service.service"
		APACHEENABLEMODS="ssl rewrite proxy_fcgi fastcgi actions alias"
		APACHEDISABLEMODS="php"
		APACHEUSER="www-data"
		APACHEGROUP="www-data"
		MYSQLCFGDIR=/etc/mysql/mysql.conf.d
		MYSQLSERV="mysql"
		PHPFPMSERV="php-fpm"
		INETDCFGDIR=/etc/xinetd.d
	elif [ -f /etc/redhat-release ]; then
		# Distribución basada en paquetes rpm.
		DEPENDENCIES=( curl rsync btrfs-progs procps-ng arp-scan gettext moreutils jq net-tools udpcast libev-devel jansson-devel openssl-devel shim-x64 grub2-efi-x64 grub2-efi-x64-modules gawk libdbi-devel libdbi libdbi-dbd-mysql automake)
		# Repositorios para PHP 7 en CentOS.
		[ "$OSDISTRIB" == "centos" ] && UPDATEPKGLIST="yum update -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-$OSVERSION.noarch.rpm http://rpms.remirepo.net/enterprise/remi-release-$OSVERSION.rpm"
		INSTALLPKGS="yum install -y"
		DELETEPKGS="yum remove -y"
		CHECKPKG="rpm -q --quiet \$package"
		if which systemctl &>/dev/null; then
			STARTSERVICE="eval systemctl restart \$service.service"
			STOPSERVICE="eval systemctl stop \$service.service"
			ENABLESERVICE="eval systemctl enable \$service.service"
			SERVICESTATUS="eval systemctl status \$service.service"
		else
			STARTSERVICE="eval service \$service restart"
			STOPSERVICE="eval service \$service stop"
			ENABLESERVICE="eval chkconfig \$service on"
			SERVICESTATUS="eval service \$service status"
		fi
		APACHEUSER="apache"
		APACHEGROUP="apache"
		MYSQLCFGDIR=/etc/my.cnf.d
		MYSQLSERV="mariadb"
		PHPFPMSERV="php-fpm"
		INETDCFGDIR=/etc/xinetd.d
	else
		# Otras distribuciones.
		:
	fi
	for service in apache2 httpd; do
		[ -d "/etc/$service" ] && APACHECFGDIR="/etc/$service"
		if $SERVICESTATUS &>/dev/null; then APACHESERV="$service"; fi
	done
	for service in dhcpd dhcpd3-server isc-dhcp-server; do
		if $SERVICESTATUS &>/dev/null; then DHCPSERV="$service"; fi
	done
}


# Choose an available version to update.
function chooseVersion()
{
    local RELEASES DOWNLOADS INSTVERSION INSTRELEASE RELDATE

    # Development branch.
    BRANCH="master"
    API_URL="https://api.github.com/repos/opengnsys/OpenGnsys/branches/$BRANCH"

    RELEASES=( )
    DOWNLOADS=( )
    # If updating from a local or very old version, use the default data.
    if [ $REMOTE -eq 1 ] && which jq &>/dev/null && [ -f $INSTALL_TARGET/doc/VERSION.json -o -f $INSTALL_TARGET/doc/VERSION.txt ]; then
        # Installed release.
        [ -f $INSTALL_TARGET/doc/VERSION.json ] && read -pe INSTVERSION INSTRELEASE <<< $(jq -r '.version+" "+.release' $INSTALL_TARGET/doc/VERSION.json)
        [ -f $INSTALL_TARGET/doc/VERSION.txt ] && read -pe INSTVERSION INSTRELEASE <<< $(awk '{print $2,$3}' $INSTALL_TARGET/doc/VERSION.txt)
        # Fetch tags (releases) data from GitHub.
        while read -pe TAG URL; do
            if [[ $TAG =~ ^(opengnsys-|v)[0-9] ]]; then
                [ "${TAG#opengnsys-}" \< "${INSTVERSION%pre}" ] && continue
                [ "${TAG#v}" \< "${INSTVERSION%pre}" ] && continue
                RELDATE=$(curl -s "$URL" | jq -r '.commit.committer.date | split("-") | join("")[:8]')
                RELEASES+=( "${TAG} ($RELDATE)" )
                DOWNLOADS+=( "$URL" )
            fi
        done <<< $(curl -s "$API_URL/../../tags" | jq -r '.[] | .name+" "+.commit.url')
        # Add development (master) branch.
        RELEASES+=( "$BRANCH" )
        DOWNLOADS+=( "$API_URL" )
        # Show selection menu, if needed.
        if [ ${#RELEASES[@]} -gt 1 ]; then
            echo "Installed version: $INSTVERSION $INSTRELEASE"
            echo "Versions available for update (\"$BRANCH\" is the latest development branch):"
            PS3="Enter a number (CTRL-C to exit): "
            select opt in "${RELEASES[@]}"; do
                if [ -n "$opt" ]; then
                    BRANCH="${opt%% *}"
                    API_URL="${DOWNLOADS[REPLY-1]}"
                    break
                fi
            done
        fi
    fi
    # Download URLs.
    CODE_URL="https://codeload.github.com/opengnsys/OpenGnsys/zip/$BRANCH"
    RAW_URL="https://raw.githubusercontent.com/opengnsys/OpenGnsys/$BRANCH"
}


# Comprobar auto-actualización.
function checkAutoUpdate()
{
	local update=0

	# Actaulizar el script si ha cambiado o no existe el original.
	if [ $REMOTE -eq 1 ]; then
		curl -s $RAW_URL/installer/$PROGRAMNAME -o $PROGRAMNAME
		chmod +x $PROGRAMNAME
		if ! diff -q $PROGRAMNAME $INSTALL_TARGET/lib/$PROGRAMNAME 2>/dev/null || ! test -f $INSTALL_TARGET/lib/$PROGRAMNAME; then
			mv $PROGRAMNAME $INSTALL_TARGET/lib
			update=1
		else
			rm -f $PROGRAMNAME
		fi
	else
		if ! diff -q $PROGRAMDIR/$PROGRAMNAME $INSTALL_TARGET/lib/$PROGRAMNAME 2>/dev/null || ! test -f $INSTALL_TARGET/lib/$PROGRAMNAME; then
			cp -a $PROGRAMDIR/$PROGRAMNAME $INSTALL_TARGET/lib
			update=1
		fi
	fi

	return $update
}


function getDateTime()
{
	date "+%Y%m%d-%H%M%S"
}

# Escribe a fichero y muestra por pantalla
function echoAndLog()
{
	echo "$1"
	DATETIME=`getDateTime`
	echo "$DATETIME;$SSH_CLIENT;$1" >> $LOG_FILE
}

function errorAndLog()
{
	echo "ERROR: $1"
	DATETIME=`getDateTime`
	echo "$DATETIME;$SSH_CLIENT;ERROR: $1" >> $LOG_FILE
}

# Escribe a fichero y muestra mensaje de aviso
function warningAndLog()
{
	local DATETIME=`getDateTime`
	echo "Warning: $1"
	echo "$DATETIME;$SSH_CLIENT;Warning: $1" >> $LOG_FILE
}


#####################################################################
####### Funciones de copia de seguridad y restauración de ficheros
#####################################################################

# Hace un backup del fichero pasado por parámetro
# deja un -last y uno para el día
function backupFile()
{
	if [ $# -ne 1 ]; then
		errorAndLog "${FUNCNAME}(): invalid number of parameters"
		exit 1
	fi

	local fichero=$1
	local fecha=`date +%Y%m%d`

	if [ ! -f $fichero ]; then
		warningAndLog "${FUNCNAME}(): file $fichero doesn't exists"
		return 1
	fi

	echoAndLog "${FUNCNAME}(): Making $fichero back-up"

	# realiza una copia de la última configuración como last
	cp -a $fichero "${fichero}-LAST"

	# si para el día no hay backup lo hace, sino no
	if [ ! -f "${fichero}-${fecha}" ]; then
		cp -a $fichero "${fichero}-${fecha}"
	fi
}

# Restaura un fichero desde su copia de seguridad
function restoreFile()
{
	if [ $# -ne 1 ]; then
		errorAndLog "${FUNCNAME}(): invalid number of parameters"
		exit 1
	fi

	local fichero=$1

	echoAndLog "${FUNCNAME}(): restoring file $fichero"
	if [ -f "${fichero}-LAST" ]; then
		cp -a "$fichero-LAST" "$fichero"
	fi
}


#####################################################################
####### Funciones de acceso a base de datos
#####################################################################

# Actualizar la base datos
function importSqlFile()
{
        if [ $# -ne 4 ]; then
                errorAndLog "${FNCNAME}(): invalid number of parameters"
                exit 1
        fi

        local dbuser="$1"
        local dbpassword="$2"
        local database="$3"
        local sqlfile="$4"
        local tmpfile=$(mktemp)
        local mycnf=/tmp/.my.cnf.$$
        local status

        if [ ! -r $sqlfile ]; then
                errorAndLog "${FUNCNAME}(): Unable to read $sqlfile!!"
                return 1
        fi

        echoAndLog "${FUNCNAME}(): importing SQL file to ${database}..."
        chmod 600 $tmpfile
        sed -e "s/SERVERIP/$SERVERIP/g" -e "s/DBUSER/$OPENGNSYS_DB_USER/g" \
            -e "s/DBPASSWORD/$OPENGNSYS_DB_PASSWD/g" $sqlfile > $tmpfile
	# Componer fichero con credenciales de conexión.  
	touch $mycnf
	chmod 600 $mycnf
	cat << EOT > $mycnf
[client]
user=$dbuser
password=$dbpassword
EOT
	# Antes de actualizar, reasignar valores para campos no nulos con nulo por defecto.
	mysql --defaults-extra-file=$MYCNF -D "$database" -e \
		"$(mysql --defaults-extra-file=$MYCNF -Nse "
SELECT CASE WHEN DATA_TYPE LIKE '%int' THEN
                 CONCAT_WS(' ', 'ALTER TABLE', TABLE_NAME, 'ALTER', COLUMN_NAME, 'SET DEFAULT 0;')
            WHEN DATA_TYPE LIKE '%char' THEN
                 CONCAT_WS(' ', 'ALTER TABLE', TABLE_NAME, 'ALTER', COLUMN_NAME, 'SET DEFAULT \'\';')
            WHEN DATA_TYPE = 'text' THEN
                 CONCAT_WS(' ', 'ALTER TABLE', TABLE_NAME, 'MODIFY', COLUMN_NAME, 'TEXT NOT NULL;')
            ELSE ''
       END
  FROM information_schema.COLUMNS
 WHERE TABLE_SCHEMA='$database'
   AND IS_NULLABLE='NO'
   AND COLUMN_DEFAULT IS NULL
   AND COLUMN_KEY='';")"
	# Ejecutar actualización y borrar fichero de credenciales.
	mysql --defaults-extra-file=$mycnf --default-character-set=utf8 -D "$database" < $tmpfile
	status=$?
	rm -f $mycnf $tmpfile
	if [ $status -ne 0 ]; then
                errorAndLog "${FUNCNAME}(): error importing $sqlfile in database $database"
                return 1
        fi
        echoAndLog "${FUNCNAME}(): file imported to database $database"
        return 0
}

# Comprobar configuración de MySQL y recomendar cambios necesarios.
function checkMysqlConfig()
{
	echoAndLog "${FUNCNAME}(): checking MySQL configuration"

	cp -a $WORKDIR/opengnsys/server/etc/mysqld-og.cnf $MYSQLCFGDIR 2>/dev/null
	service=$MYSQLSERV; $STARTSERVICE

        echoAndLog "${FUNCNAME}(): MySQL configuration has checked"
        return 0
}

#####################################################################
####### Funciones de instalación de paquetes
#####################################################################

# Instalar las deependencias necesarias para el actualizador.
function installDependencies()
{
	local package

	# Comprobar si hay que actualizar PHP 5 a PHP 7.
	eval $UPDATEPKGLIST
	if [ -f /etc/debian_version ]; then
		# Basado en paquetes Deb.
		PHP7VERSION="php7.2"
		PHPFPMSERV="${PHP7VERSION}-fpm"
		PHP5PKGS=( $(dpkg -l | awk '$2~/^php5/ {print $2}') )
		if [ -n "$PHP5PKGS" ]; then
			$DELETEPKGS ${PHP5PKGS[@]}
			PHP5PKGS[0]="$PHP7VERSION"
			INSTALLDEPS=${PHP5PKGS[@]//php5*-/${PHP7VERSION}-}
		fi
	fi
	if [ "$OSDISTRIB" == "centos" ]; then
		PHP7VERSION=$(yum list -q php7\* 2>/dev/null | awk -F. '/^php/ {print $1; exit;}')
		PHPFPMSERV="${PHP7VERSION}-${PHPFPMSERV}"
		PHP5PKGS=( $(yum list installed | awk '$1~/^php/ && $2~/^5\./ {sub(/\..*$/, "", $1); print $1}') )
		if [ -n "$PHP5PKGS" ]; then
			$DELETEPKGS ${PHP5PKGS[@]}
			PHP5PKGS[0]="$PHP7VERSION-php"
			INSTALLDEPS=${PHP5PKGS[@]//php-/${PHP7VERSION}-php}
		fi
	fi

	if [ $# = 0 ]; then
		echoAndLog "${FUNCNAME}(): no dependencies are needed"
	else
		while [ $# -gt 0 ]; do
			package="${1/php/$PHP7VERSION}"
			eval $CHECKPKG || INSTALLDEPS="$INSTALLDEPS $package"
			shift
		done
		if [ -n "$INSTALLDEPS" ]; then
			$INSTALLPKGS $INSTALLDEPS
			if [ $? -ne 0 ]; then
				errorAndLog "${FUNCNAME}(): cannot install some dependencies: $INSTALLDEPS"
				return 1
			fi
		fi
	fi
}


#####################################################################
####### Funciones para descargar código
#####################################################################

function downloadCode()
{
	if [ $# -ne 1 ]; then
		errorAndLog "${FUNCNAME}(): invalid number of parameters"
		exit 1
	fi

	local url="$1"
	echoAndLog "${FUNCNAME}(): downloading code..."

	curl "$url" -o opengnsys.zip && \
		unzip -qo opengnsys.zip && \
		rm -fr opengnsys && \
		mv "OpenGnsys-${BRANCH#v}" opengnsys
	if [ $? -ne 0 ]; then
		errorAndLog "${FUNCNAME}(): error getting code from ${url}, verify your user and password"
		return 1
	fi
	rm -f opengnsys.zip
	echoAndLog "${FUNCNAME}(): code was downloaded"
	return 0
}


############################################################
###  Detectar red
############################################################

# Comprobar si existe conexión.
function checkNetworkConnection()
{
	OPENGNSYS_SERVER=${OPENGNSYS_SERVER:-"opengnsys.es"}
	if which curl &>/dev/null; then
		curl --connect-timeout 10 -s "https://$OPENGNSYS_SERVER" -o /dev/null && \
			curl --connect-timeout 10 -s "http://$OPENGNSYS_SERVER" -o /dev/null
	elif which wget &>/dev/null; then
		wget --spider -q "https://$OPENGNSYS_SERVER" && \
			wget --spider -q "http://$OPENGNSYS_SERVER"
	else
		echoAndLog "${FUNCNAME}(): Cannot execute \"wget\" nor \"curl\"."
		return 1
	fi
}

# Comprobar si la versión es anterior a la actual.
function checkVersion()
{
	local PRE

	# Obtener versión actual y versión a actualizar.
	[ -f $INSTALL_TARGET/doc/VERSION.txt ] && OLDVERSION=$(awk '{print $2}' $INSTALL_TARGET/doc/VERSION.txt 2>/dev/null)
	[ -f $INSTALL_TARGET/doc/VERSION.json ] && OLDVERSION=$(jq -r '.version' $INSTALL_TARGET/doc/VERSION.json 2>/dev/null)
	if [ $REMOTE -eq 1 ]; then
		NEWVERSION=$(curl -s $RAW_URL/doc/VERSION.json 2>/dev/null | jq -r '.version')
	else
		NEWVERSION=$(jq -r '.version' $PROGRAMDIR/../doc/VERSION.json 2>/dev/null)
	fi
	[[ "$NEWVERSION" =~ pre ]] && PRE=1

	# Comparar versiones.
	[[ "$NEWVERSION" < "${OLDVERSION/pre/}" ]] && return 1
	[ "${NEWVERSION/pre/}" == "$OLDVERSION" -a "$PRE" == "1" ] && return 1

	return 0
}

# Obtener los parámetros de red del servidor.
function getNetworkSettings()
{
	# Variables globales definidas:
	# - SERVERIP:   IP local de la interfaz por defecto.

	local DEVICES
	local dev

	SERVERIP="$ServidorAdm"
	DEVICES="$(ip -o link show up | awk '!/loopback/ {sub(/:.*/,"",$2); print $2}')"
	for dev in $DEVICES; do
		[ -z "$SERVERIP" ] && SERVERIP=$(ip -o addr show dev $dev | awk '$3~/inet$/ {sub (/\/.*/, ""); print ($4); exit;}')
	done
}


#####################################################################
####### Funciones específicas de la instalación de Opengnsys
#####################################################################

# Actualizar cliente OpenGnsys.
function updateClientFiles()
{
	local ENGINECFG=$INSTALL_TARGET/client/etc/engine.cfg

	# Actualizar ficheros del cliente.
	backupFile $ENGINECFG
	echoAndLog "${FUNCNAME}(): Updating OpenGnsys Client files"
	rsync -irplt $WORKDIR/opengnsys/client/shared/* $INSTALL_TARGET/client
	if [ $? -ne 0 ]; then
		errorAndLog "${FUNCNAME}(): error while updating client structure"
		exit 1
	fi

	# Actualizar librerías del motor de clonación.
	echoAndLog "${FUNCNAME}(): Updating OpenGnsys Cloning Engine files"
	rsync -irplt $WORKDIR/opengnsys/client/engine/*.lib* $INSTALL_TARGET/client/lib/engine/bin
	if [ $? -ne 0 ]; then
		errorAndLog "${FUNCNAME}(): error while updating engine files"
		exit 1
	fi
	# Actualizar fichero de configuración del motor de clonación.
	if ! grep -q "^TZ" $ENGINECFG; then
		TZ=$(timedatectl status | awk -F"[:()]" '/Time.*zone/ {print $2}')
		cat << EOT >> $ENGINECFG
# OpenGnsys Server timezone.
TZ="${TZ// /}"
EOT
	fi
	if ! diff -q ${ENGINECFG}{,-LAST} &>/dev/null; then
		NEWFILES="$NEWFILES $ENGINECFG"
	else
		rm -f ${ENGINECFG}-LAST
	fi
	# Obtener URL para descargas adicionales.
	DOWNLOADURL=$(oglivecli config download-url 2>/dev/null)
	DOWNLOADURL=${DOWNLOADURL:-"https://$OPENGNSYS_SERVER/trac/downloads"}

	echoAndLog "${FUNCNAME}(): client files successfully updated"
}

# Crear certificado para la firma de cargadores de arranque, si es necesario.
function createCerts ()
{
	local SSLCFGDIR=$INSTALL_TARGET/client/etc/ssl
	mkdir -p $SSLCFGDIR/{certs,private}
	if [ ! -f $SSLCFGDIR/private/opengnsys.key ]; then
		echoAndLog "${FUNCNAME}(): creating certificate files"
		openssl req -new -x509 -newkey rsa:2048 -keyout $SSLCFGDIR/private/opengnsys.key -out $SSLCFGDIR/certs/opengnsys.crt -nodes -days 3650 -subj "/CN=OpenGnsys/"
		openssl x509 -in $SSLCFGDIR/certs/opengnsys.crt -out $SSLCFGDIR/certs/opengnsys.cer -outform DER
		echoAndLog "${FUNCNAME}(): certificate successfully created"
	fi
}

# Configurar HTTPS y exportar usuario y grupo del servicio Apache.
function apacheConfiguration ()
{
	local config template module socketfile

	# Avtivar PHP-FPM.
	echoAndLog "${FUNCNAME}(): configuring PHP-FPM"
	service=$PHPFPMSERV
	$ENABLESERVICE; $STARTSERVICE

	# Activar módulos de Apache.
	if [ -e $APACHECFGDIR/sites-available/opengnsys.conf ]; then
		echoAndLog "${FUNCNAME}(): Configuring Apache modules"
		a2ensite default-ssl
		for module in $APACHEENABLEMODS; do a2enmod -q "$module"; done
		for module in $APACHEDISABLEMODS; do a2dismod -q "${module//PHP7VERSION}"; done
		a2ensite opengnsys
	elif [ -e $APACHECFGDIR/conf.modules.d ]; then
		echoAndLog "${FUNCNAME}(): Configuring Apache modules"
		sed -i '/rewrite/s/^#//' $APACHECFGDIR/*.conf
	fi
	# Elegir plantilla según versión de Apache.
	if [ -n "$(apachectl -v | grep "2\.[0-2]")" ]; then
	       template=$WORKDIR/opengnsys/server/etc/apache-prev2.4.conf.tmpl > $config
	else
	       template=$WORKDIR/opengnsys/server/etc/apache.conf.tmpl
	fi
	sockfile=$(find /run/php -name "php*.sock" -type s -print 2>/dev/null | tail -1)
	# Actualizar configuración de Apache a partir de fichero de plantilla.
	for config in $APACHECFGDIR/{,sites-available/}opengnsys.conf; do
		if [ -e $config ]; then
			if [ -n "$sockfile" ]; then
				sed -e "s,CONSOLEDIR,$INSTALL_TARGET/www,g; s,proxy:fcgi:.*,proxy:unix:${sockfile%% *}|fcgi://localhost\",g" $template > $config
			else
				sed -e "s,CONSOLEDIR,$INSTALL_TARGET/www,g" $template > $config
			fi
		fi
	done

	# Reiniciar Apache.
	service=$APACHESERV; $STARTSERVICE

	# Variables de ejecución de Apache.
	# - APACHE_RUN_USER
	# - APACHE_RUN_GROUP
	if [ -f $APACHECFGDIR/envvars ]; then
		source $APACHECFGDIR/envvars
	fi
	APACHE_RUN_USER=${APACHE_RUN_USER:-"$APACHEUSER"}
	APACHE_RUN_GROUP=${APACHE_RUN_GROUP:-"$APACHEGROUP"}
}

# Configurar servicio Rsync.
function rsyncConfigure()
{
	local service 

	# Configurar acceso a Rsync.
	if [ ! -f /etc/rsyncd.conf ]; then
		echoAndLog "${FUNCNAME}(): Configuring Rsync service"
		NEWFILES="$NEWFILES /etc/rsyncd.conf"
		sed -e "s/CLIENTUSER/$OPENGNSYS_CLIENTUSER/g" \
		    $WORKDIR/opengnsys/repoman/etc/rsyncd.conf.tmpl > /etc/rsyncd.conf
		# Habilitar Rsync.
		if [ -f /etc/default/rsync ]; then
			perl -pi -e 's/RSYNC_ENABLE=.*/RSYNC_ENABLE=inetd/' /etc/default/rsync
		fi
		if [ -f $INETDCFGDIR/rsync ]; then
			perl -pi -e 's/disable.*/disable = no/' $INETDCFGDIR/rsync
		else
			cat << EOT > $INETDCFGDIR/rsync
service rsync
{
	disable = no
	socket_type = stream
	wait = no
	user = root
	server = $(which rsync)
	server_args = --daemon
	log_on_failure += USERID
	flags = IPv6
}
EOT
		fi
		# Activar e iniciar Rsync.
		service="rsync"  $ENABLESERVICE
		service="xinetd"
		$ENABLESERVICE; $STARTSERVICE
	fi
}

# Copiar ficheros del OpenGnsys Web Console.
function updateWebFiles()
{
	local ERRCODE COMPATDIR f

	echoAndLog "${FUNCNAME}(): Updating web files..."

	# Copiar los ficheros nuevos conservando el archivo de configuración de acceso.
	backupFile $INSTALL_TARGET/www/controlacceso.php
	mv $INSTALL_TARGET/www $INSTALL_TARGET/WebConsole
	rsync -irplt $WORKDIR/opengnsys/admin/WebConsole $INSTALL_TARGET
	ERRCODE=$?
	mv $INSTALL_TARGET/WebConsole $INSTALL_TARGET/www
	rm -fr $INSTALL_TARGET/www/xajax
	unzip -o $WORKDIR/opengnsys/admin/slim-2.6.1.zip -d $INSTALL_TARGET/www/rest
	unzip -o $WORKDIR/opengnsys/admin/swagger-ui-2.2.5.zip -d $INSTALL_TARGET/www/rest
	if [ $ERRCODE != 0 ]; then
		errorAndLog "${FUNCNAME}(): Error updating web files."
		exit 1
	fi
	restoreFile $INSTALL_TARGET/www/controlacceso.php

	# Cambiar acceso a protocolo HTTPS.
	if grep -q "http://" $INSTALL_TARGET/www/controlacceso.php 2>/dev/null; then
		echoAndLog "${FUNCNAME}(): updating web access file"
		perl -pi -e 's!http://!https://!g' $INSTALL_TARGET/www/controlacceso.php
		NEWFILES="$NEWFILES $INSTALL_TARGET/www/controlacceso.php"
	fi
	
	# Compatibilidad con dispositivos móviles.
	COMPATDIR="$INSTALL_TARGET/www/principal"
	for f in acciones administracion aula aulas hardwares imagenes menus repositorios softwares; do
		sed 's/clickcontextualnodo/clicksupnodo/g' $COMPATDIR/$f.php > $COMPATDIR/$f.device.php
	done
	cp -a $COMPATDIR/imagenes.device.php $COMPATDIR/imagenes.device4.php
	# Acceso al manual de usuario
	ln -fs ../doc/userManual $INSTALL_TARGET/www/userManual
	# Fichero de log de la API REST.
	touch $INSTALL_TARGET/log/{ogagent,rest,remotepc}.log

	echoAndLog "${FUNCNAME}(): Web files successfully updated"
}

# Copiar ficheros en la zona de descargas de OpenGnsys Web Console.
function updateDownloadableFiles()
{
	local VERSIONFILE OGVERSION FILENAME TARGETFILE

	# Obtener versión a descargar.
	VERSIONFILE="$INSTALL_TARGET/doc/VERSION.json"
	OGVERSION="$(jq -r ".ogagent // \"$NEWVERSION\"" $VERSIONFILE 2>/dev/null || echo "$NEWVERSION")"
	FILENAME="ogagentpkgs-$OGVERSION.tar.gz"
	TARGETFILE=$WORKDIR/$FILENAME

	# Descargar archivo comprimido, si es necesario.
	if [ -s $PROGRAMDIR/$FILENAME ]; then
		echoAndLog "${FUNCNAME}(): Moving $PROGRAMDIR/$FILENAME file to $(dirname $TARGETFILE)"
		mv $PROGRAMDIR/$FILENAME $TARGETFILE
	else
		echoAndLog "${FUNCNAME}(): Downloading $FILENAME"
		curl $DOWNLOADURL/$FILENAME -o $TARGETFILE
	fi
	if [ ! -s $TARGETFILE ]; then
		errorAndLog "${FUNCNAME}(): Cannot download $FILENAME"
		return 1
	fi

	# Descomprimir fichero en zona de descargas.
	tar xvzf $TARGETFILE -C $INSTALL_TARGET/www/descargas
	if [ $? != 0 ]; then
		errorAndLog "${FUNCNAME}(): Error uncompressing archive $FILENAME"
		return 1
	fi
}

# Copiar carpeta de Interface 
function updateInterfaceAdm()
{ 
	local errcode=0 

	# Crear carpeta y copiar Interface 
	echoAndLog "${FUNCNAME}(): Copying Administration Interface Folder" 
	mv $INSTALL_TARGET/client/interfaceAdm $INSTALL_TARGET/client/Interface
	rsync -irplt $WORKDIR/opengnsys/admin/Interface $INSTALL_TARGET/client
	errcoce=$?
	mv $INSTALL_TARGET/client/Interface $INSTALL_TARGET/client/interfaceAdm
	if [ $errcode -ne 0 ]; then 
		echoAndLog "${FUNCNAME}(): error while updating admin interface" 
		exit 1
	fi 
	echoAndLog "${FUNCNAME}(): Admin interface successfully updated"
} 

# Crear documentación Doxygen para la consola web.
function makeDoxygenFiles()
{
	echoAndLog "${FUNCNAME}(): Making Doxygen web files..."
	$WORKDIR/opengnsys/installer/ogGenerateDoc.sh \
			$WORKDIR/opengnsys/client/engine $INSTALL_TARGET/www
	if [ ! -d "$INSTALL_TARGET/www/html" ]; then
		errorAndLog "${FUNCNAME}(): unable to create Doxygen web files"
		return 1
	fi
	rm -fr "$INSTALL_TARGET/www/api"
	mv "$INSTALL_TARGET/www/html" "$INSTALL_TARGET/www/api"
	rm -fr $INSTALL_TARGET/www/{man,perlmod,rtf}
	echoAndLog "${FUNCNAME}(): Doxygen web files created successfully"
}


# Crea la estructura base de la instalación de opengnsys
function createDirs()
{
	# Crear estructura de directorios.
	echoAndLog "${FUNCNAME}(): creating directory paths in ${INSTALL_TARGET}"
	local dir MKNETDIR

	mkdir -p ${INSTALL_TARGET}/{bin,doc,etc,lib,sbin,www}
	mkdir -p ${INSTALL_TARGET}/{client,images/groups}
	mkdir -p ${INSTALL_TARGET}/log/clients
	if [ ! -d ${INSTALL_TARGET}/log/clients/setBootMode ]; then
		mkdir -p ${INSTALL_TARGET}/log/clients/setBootMode
		chmod 777 ${INSTALL_TARGET}/log/clients/setBootMode
	else
		chmod 777 ${INSTALL_TARGET}/log/clients/setBootMode
	fi
	ln -fs ${INSTALL_TARGET}/log /var/log/opengnsys
	# Detectar directorio de instalación de TFTP.
	if [ ! -L ${INSTALL_TARGET}/tftpboot ]; then
		for dir in /var/lib/tftpboot /srv/tftp; do
			[ -d $dir ] && ln -fs $dir ${INSTALL_TARGET}/tftpboot
		done
	fi
	mkdir -p $INSTALL_TARGET/tftpboot/{menu.lst,grub}/examples
	if [ $? -ne 0 ]; then
		errorAndLog "${FUNCNAME}(): error while creating dirs. Do you have write permissions?"
		return 1
	fi
	! [ -f $INSTALL_TARGET/tftpboot/menu.lst/templates/00unknown ] && mv $INSTALL_TARGET/tftpboot/menu.lst/templates/* $INSTALL_TARGET/tftpboot/menu.lst/examples
	! [ -f $INSTALL_TARGET/tftpboot/grub/templates/10 ] && mv $INSTALL_TARGET/tftpboot/grub/templates/* $INSTALL_TARGET/tftpboot/grub/examples

	# Preparar arranque en red con Grub.
	for f in grub-mknetdir grub2-mknetdir; do
		if which $f &>/dev/null; then MKNETDIR=$f; fi
	done
	$MKNETDIR --net-directory=${INSTALL_TARGET}/tftpboot --subdir=grub

	# Crear usuario ficticio.
	if id -u $OPENGNSYS_CLIENTUSER &>/dev/null; then
		echoAndLog "${FUNCNAME}(): user \"$OPENGNSYS_CLIENTUSER\" is already created"
	else
		echoAndLog "${FUNCNAME}(): creating OpenGnsys user"
		useradd $OPENGNSYS_CLIENTUSER 2>/dev/null
		if [ $? -ne 0 ]; then
			errorAndLog "${FUNCNAME}(): error creating OpenGnsys user"
			return 1
		fi
	fi

	# Mover el fichero de registro al directorio de logs. 
	echoAndLog "${FUNCNAME}(): moving update log file" 
	mv $LOG_FILE $OGLOGFILE && LOG_FILE=$OGLOGFILE 
	chmod 600 $LOG_FILE

	echoAndLog "${FUNCNAME}(): directory paths created"
	return 0
}

# Actualización incremental de la BD (versión actaul a actaul+1, hasta final-1 a final).
function updateDatabase()
{
	local DBDIR="$WORKDIR/opengnsys/admin/Database"
	local file FILES=""

	echoAndLog "${FUNCNAME}(): looking for database updates"
	pushd $DBDIR >/dev/null
	# Bucle de actualización incremental desde versión actual a la final.
	for file in $OPENGNSYS_DATABASE-*-*.sql; do
		case "$file" in
			$OPENGNSYS_DATABASE-$OLDVERSION-$NEWVERSION.sql)
				# Actualización única de versión inicial y final.
				FILES="$FILES $file"
				break
				;;
			$OPENGNSYS_DATABASE-*-postinst.sql)
				# Ignorar fichero específico de post-instalación.
				;;
			$OPENGNSYS_DATABASE-$OLDVERSION-*.sql)
				# Actualización de versión n a n+1.
				FILES="$FILES $file"
				OLDVERSION="$(echo ${file%.*} | cut -f3 -d-)"
				;;
			$OPENGNSYS_DATABASE-*-$NEWVERSION.sql)
				# Última actualización de versión final-1 a final.
				if [ -n "$FILES" ]; then
					FILES="$FILES $file"
					break
				fi
				;;
		esac
	done
	# Aplicar posible actualización propia para la versión final.
	file=$OPENGNSYS_DATABASE-$NEWVERSION.sql
	if [ -n "$FILES" -o "$OLDVERSION" = "$NEWVERSION" -a -r $file ]; then
		FILES="$FILES $file"
	fi

	popd >/dev/null
	if [ -n "$FILES" ]; then
		for file in $FILES; do
			importSqlFile $OPENGNSYS_DBUSER $OPENGNSYS_DBPASSWORD $OPENGNSYS_DATABASE $DBDIR/$file
		done
		echoAndLog "${FUNCNAME}(): database is update"
	else
		echoAndLog "${FUNCNAME}(): database unchanged"
	fi
}

# Copia ficheros de configuración y ejecutables genéricos del servidor.
function updateServerFiles()
{
	# No copiar ficheros del antiguo cliente Initrd
	local SOURCES=(	repoman/bin \
			server/bin \
			server/lib \
			admin/Sources/Services/ogAdmRepoAux \
			server/tftpboot \
			/usr/lib/shim/shimx64.efi.signed \
			/usr/lib/grub/x86_64-efi-signed/grubnetx64.efi.signed \
			installer/opengnsys_uninstall.sh \
			installer/opengnsys_export.sh \
			installer/opengnsys_import.sh \
			doc )
	local TARGETS=(	bin \
			bin \
			lib \
			sbin/ogAdmRepoAux \
			tftpboot \
			tftpboot/shimx64.efi.signed \
			tftpboot/grubx64.efi \
			lib/opengnsys_uninstall.sh \
			lib/opengnsys_export.sh \
			lib/opengnsys_import.sh \
			doc )

	if [ ${#SOURCES[@]} != ${#TARGETS[@]} ]; then
		errorAndLog "${FUNCNAME}(): inconsistent number of array items"
		exit 1
	fi

	echoAndLog "${FUNCNAME}(): updating files in server directories"
	pushd $WORKDIR/opengnsys >/dev/null
	local i
	for (( i = 0; i < ${#SOURCES[@]}; i++ )); do
		if [ -d "$INSTALL_TARGET/${TARGETS[i]}" ]; then
			rsync -irplt "${SOURCES[i]}" $(dirname $(readlink -e "$INSTALL_TARGET/${TARGETS[i]}"))
		else
			rsync -irplt "${SOURCES[i]}" $(readlink -m "$INSTALL_TARGET/${TARGETS[i]}")
		fi
	done
	popd >/dev/null
	NEWFILES=""		# Ficheros de configuración que han cambiado de formato.
	if grep -q 'pxelinux.0' /etc/dhcp*/dhcpd*.conf; then
		echoAndLog "${FUNCNAME}(): updating DHCP files"
		perl -pi -e 's/pxelinux.0/grldr/' /etc/dhcp*/dhcpd*.conf
		service=$DHCPSERV; $STARTSERVICE
		NEWFILES="/etc/dhcp*/dhcpd*.conf"
	fi
	if ! grep -q 'shimx64.efi.signed' /etc/dhcp*/dhcpd*.conf; then
		echoAndLog "${FUNCNAME}(): updating DHCP files for UEFI computers"
		UEFICFG="    # 0007 == x64 EFI boot\n"\
"    if option arch = 00:07 {\n"\
"        filename \"shimx64.efi.signed\";\n"\
"    } else {\n"\
"        filename \"grldr\";\n"\
"    }"
		sed -i -e 1i"option arch code 93 = unsigned integer 16;" -e s@"^.*grldr\"\;"@"$UEFICFG"@g /etc/dhcp*/dhcpd*.conf
		service=$DHCPSERV; $STARTSERVICE
		NEWFILES="/etc/dhcp*/dhcpd*.conf"
	fi
	if ! diff -q $WORKDIR/opengnsys/admin/Sources/Services/opengnsys.init /etc/init.d/opengnsys 2>/dev/null; then
		echoAndLog "${FUNCNAME}(): updating new init file"
		backupFile /etc/init.d/opengnsys
		service="opengnsys"
		$STOPSERVICE
		cp -a $WORKDIR/opengnsys/admin/Sources/Services/opengnsys.init /etc/init.d/opengnsys
		systemctl daemon-reload
		$STARTSERVICE
		NEWFILES="$NEWFILES /etc/init.d/opengnsys"
	fi
	if ! diff -q \
	     $WORKDIR/opengnsys/admin/Sources/Services/opengnsys.service \
	     /lib/systemd/system/opengnsys.service 2>/dev/null; then
		echoAndLog "${FUNCNAME}(): updating new service file"
		backupFile /lib/systemd/system/opengnsys.service
		service="opengnsys"
		$STOPSERVICE
		cp -a \
		   $WORKDIR/opengnsys/admin/Sources/Services/opengnsys.service \
		   /lib/systemd/system/opengnsys.service
		systemctl daemon-reload
		$STARTSERVICE
		NEWFILES="$NEWFILES /lib/systemd/system/opengnsys.service"
	fi
	if ! diff -q $WORKDIR/opengnsys/admin/Sources/Services/opengnsys.default /etc/default/opengnsys >/dev/null; then
		echoAndLog "${FUNCNAME}(): updating new default file"
		backupFile /etc/default/opengnsys
		# Buscar si hay nuevos parámetros.
		local var valor
		while IFS="=" read -e var valor; do
			[[ $var =~ ^# ]] || \
				grep -q "^$var=" /etc/default/opengnsys || \
				echo "$var=$valor" >> /etc/default/opengnsys
		done < $WORKDIR/opengnsys/admin/Sources/Services/opengnsys.default
		NEWFILES="$NEWFILES /etc/default/opengnsys"
	fi

	echoAndLog "${FUNCNAME}(): updating cron files"
	[ ! -f /etc/cron.d/torrentcreator ] && echo "* * * * *   root   [ -x $INSTALL_TARGET/bin/torrent-creator ] && $INSTALL_TARGET/bin/torrent-creator" > /etc/cron.d/torrentcreator
	[ ! -f /etc/cron.d/torrenttracker ] && echo "5 * * * *   root   [ -x $INSTALL_TARGET/bin/torrent-tracker ] && $INSTALL_TARGET/bin/torrent-tracker" > /etc/cron.d/torrenttracker
	[ ! -f /etc/cron.d/imagedelete ] && echo "* * * * *   root   [ -x $INSTALL_TARGET/bin/deletepreimage ] && $INSTALL_TARGET/bin/deletepreimage" > /etc/cron.d/imagedelete
	[ ! -f /etc/cron.d/ogagentqueue ] && echo "* * * * *   root   [ -x $INSTALL_TARGET/bin/ogagentqueue.cron ] && $INSTALL_TARGET/bin/ogagentqueue.cron" > /etc/cron.d/ogagentqueue

	echoAndLog "${FUNCNAME}(): deleting deprecated cron file"
	[ -e /etc/cron.d/opengnsys ] && rm -f /etc/cron.d/opengnsys \
					      $INSTALL_TARGET/bin/opengnsys.cron

	# Se modifican los nombres de las plantilla PXE por compatibilidad con los equipos UEFI.
	if [ -f $INSTALL_TARGET/tftpboot/menu.lst/templates/01 ]; then
            BIOSPXEDIR="$INSTALL_TARGET/tftpboot/menu.lst/templates"
	    mv $BIOSPXEDIR/01 $BIOSPXEDIR/10
	    sed -i "s/\bMBR\b/1hd/" $BIOSPXEDIR/10
	fi
	echoAndLog "${FUNCNAME}(): server files successfully updated"
}

####################################################################
### Funciones de compilación de código fuente de servicios
####################################################################

# Mueve el fichero del nuevo servicio si es distinto al del directorio destino.
function moveNewService()
{
	local service 

	# Recibe 2 parámetros: fichero origen y directorio destino.
	[ $# == 2 ] || return 1
	[ -f  $1 -a -d $2 ] || return 1

	# Comparar los ficheros.
	if ! diff -q $1 $2/$(basename $1) &>/dev/null; then
		# Parar los servicios si fuese necesario.
		service="opengnsys"
		[ -z "$NEWSERVICES" ] && $STOPSERVICE
		# Nuevo servicio.
		NEWSERVICES="$NEWSERVICES $(basename $1)"
		# Mover el nuevo fichero de servicio
		mv $1 $2
		$STARTSERVICE
	fi
}


# Compiling and updating OpenGnsys Server service
function ogServerCompilation()
{
	local ogserverUrl="https://codeload.github.com/opengnsys/ogServer/zip/$BRANCH"
	local error=0 serv

	echoAndLog "${FUNCNAME}(): downloading ogServer code..."

	if ! (curl "${ogserverUrl}" -o ogserver.zip && \
	      unzip -qo "ogserver.zip")
	then
		errorAndLog "${FUNCNAME}(): "\
			    "error getting ogServer code from ${ogserverUrl}"
		return 1
	fi
	rm -f ogserver.zip
	echoAndLog "${FUNCNAME}(): ogServer code was downloaded"

	echoAndLog "${FUNCNAME}(): Recompiling OpenGnsys Admin Server"
	pushd "$WORKDIR/ogServer-${BRANCH#v}"
	autoreconf -fi && ./configure && make && moveNewService ogserver $INSTALL_TARGET/sbin
	if [ $? -ne 0 ]; then
		echoAndLog "${FUNCNAME}(): error while compiling OpenGnsys Server"
		error=1
	fi
	popd
	# Renaming OpenGnsys Server configuration file, if needed
	[ -e $INSTALL_TARGET/etc/ogAdmServer.cfg ] && \
	    rm -f $INSTALL_TARGET/etc/ogAdmServer.cfg
	[ -e $INSTALL_TARGET/etc/ogserver.cfg ] && \
	    rm -f $INSTALL_TARGET/etc/ogserver.cfg
	if [ ! -e $INSTALL_TARGET/etc/ogserver.json ]; then
		echo "{
			\"rest\" : {
				\"ip\" : \"$ServidorAdm\",
				\"port\" : \"8888\",
				\"api_token\": \"$APITOKEN\"
			},
			\"database\" : {
				\"ip\": \"$datasource\",
				\"port\": \"3306\",
				\"name\" : \"$CATALOG\",
				\"user\" : \"$USUARIO\",
				\"pass\" : \"$PASSWORD\"
			},
			\"wol\" : {
				\"interface\" : \"$INTERFACE\"
			}
		}" | jq '.' > "$INSTALL_TARGET"/etc/ogserver.json
	fi
	# Remove old OpenGnsys services
	for serv in ogAdmAgent ogAdmRepo ogAdmServer; do
		pgrep $serv > /dev/null && pkill -9 $serv && \
		    echoAndLog "${FUNCNAME}(): removing deprecated $serv service"
		rm -f $INSTALL_TARGET/sbin/$serv
		if [ $serv != ogAdmRepo ]; then
			rm -f $INSTALL_TARGET/etc/$serv.cfg
		fi
	done
	# Generating an ogServer API token, if it does not exist
	[ -z "$APITOKEN" ] && \
	    $INSTALL_TARGET/bin/settoken -f
	# Updating service file, if needed
	if ! diff -q \
	     "$WORKDIR"/ogServer-"${BRANCH#v}"/cfg/ogserver.service \
	     /lib/systemd/system/ogserver.service 2>/dev/null; then
		service="opengnsys"
		$STOPSERVICE
		echoAndLog "${FUNCNAME}(): updating new service file"
		backupFile /lib/systemd/system/ogserver.service
		service="ogserver"
		$STOPSERVICE
		cp -a \
		   "$WORKDIR"/ogServer-"${BRANCH#v}"/cfg/ogserver.service \
		   /lib/systemd/system/ogserver.service
		systemctl daemon-reload
		$STARTSERVICE
		service="opengnsys"
		$STARTSERVICE
		NEWFILES="$NEWFILES /lib/systemd/system/ogserver.service"
	fi

	return $error
}


####################################################################
### Funciones instalacion cliente OpenGnsys
####################################################################

# Actualizar cliente OpenGnsys
function updateClient()
{
	local FILENAME=ogLive-bionic-5.4.0-40-generic-amd64-r20200629.85eceaf.iso	# 1.2 (64 bits)
	local SOURCEFILE=$DOWNLOADURL/$FILENAME
	local TARGETFILE=$(oglivecli config download-dir)/$FILENAME
	local SOURCELENGTH
	local TARGETLENGTH
	local OGINITRD
	local SAMBAPASS

	# Comprobar si debe convertirse el antiguo cliente al nuevo formato ogLive.
	if oglivecli check | grep -q "oglivecli convert"; then
		echoAndLog "${FUNCNAME}(): Converting OpenGnsys Client to default ogLive"
		oglivecli convert
	fi
	# Comprobar si debe actualizarse el cliente.
	SOURCELENGTH=$(curl -sI $SOURCEFILE 2>&1 | awk '/Content-Length:/ {gsub("\r", ""); print $2}')
	TARGETLENGTH=$(stat -c "%s" $TARGETFILE 2>/dev/null)
	[ -z $TARGETLENGTH ] && TARGETLENGTH=0
	if [ "$SOURCELENGTH" != "$TARGETLENGTH" ]; then
		echoAndLog "${FUNCNAME}(): Downloading $FILENAME"
		oglivecli download $FILENAME
		if [ ! -s $TARGETFILE ]; then
			errorAndLog "${FUNCNAME}(): Error downloading $FILENAME"
			return 1
		fi
		# Actaulizar la imagen ISO del ogclient.
		echoAndLog "${FUNCNAME}(): Updatting ogLive client"
		oglivecli install $FILENAME
		
		INSTALLEDOGLIVE=${FILENAME%.*}

		echoAndLog "${FUNCNAME}(): ogLive successfully updated"
	else
		# Si no existe, crear el fichero de claves de Rsync.
		if [ ! -f /etc/rsyncd.secrets ]; then
			echoAndLog "${FUNCNAME}(): Restoring ogLive access key"
			OGINITRD=$(oglivecli config install-dir)/$(jq -r ".oglive[.default].directory")/oginitrd.img
			SAMBAPASS=$(gzip -dc $OGINITRD | \
				    cpio -i --to-stdout scripts/ogfunctions 2>&1 | \
				    grep "^[ 	].*OPTIONS=" | \
				    sed 's/\(.*\)pass=\(\w*\)\(.*\)/\2/')
			echo -ne "$SAMBAPASS\n$SAMBAPASS\n" | setsmbpass
		else
			echoAndLog "${FUNCNAME}(): ogLive is already updated"
		fi
		# Versión del ogLive instalado.
		echo "${FILENAME%.*}" > $INSTALL_TARGET/doc/veroglive.txt 
	fi
}

# Update ogClient
function updateOgClient()
{
	local ogclientUrl="https://codeload.github.com/opengnsys/ogClient/zip/$BRANCH"
	local CLIENTPASS

	echoAndLog "${FUNCNAME}(): downloading ogClient code..."

	if ! (curl "${ogclientUrl}" -o ogclient.zip && \
	     unzip -qo ogclient.zip)
	then
		errorAndLog "${FUNCNAME}(): "\
			    "error getting ogClient code from ${ogclientUrl}"
		return 1
	fi
	if [ -e $INSTALL_TARGET/client/ogClient/cfg/ogclient.json ]; then
	     rm -f ogClient-"${BRANCH#v}"/cfg/ogclient.json
	else
	     CLIENTPASS=$(awk -F":" '{print $2}' /etc/rsyncd.secrets)
	     sed -i -e 's/127.0.0.1/'$ServidorAdm'/' \
		-e 's/pass'.*$'/pass\": "'$CLIENTPASS'"/' \
		ogClient-"${BRANCH#v}"/cfg/ogclient.json
	fi
	rsync -irplt "ogClient-${BRANCH#v}/" $INSTALL_TARGET/client/ogClient
	rm -f ogclient.zip
	echoAndLog "${FUNCNAME}(): ogClient code was downloaded and updated"

	return 0
}

# Comprobar permisos y ficheros.
function checkFiles()
{
	local LOGROTATEDIR=/etc/logrotate.d

	# Comprobar permisos adecuados.
	if [ -x	$INSTALL_TARGET/bin/checkperms ]; then
		echoAndLog "${FUNCNAME}(): Checking permissions"
		OPENGNSYS_DIR="$INSTALL_TARGET" OPENGNSYS_USER="$OPENGNSYS_CLIENTUSER" APACHE_USER="$APACHE_RUN_USER" APACHE_GROUP="$APACHE_RUN_GROUP" $INSTALL_TARGET/bin/checkperms
	fi
	# Eliminamos el fichero de estado del tracker porque es incompatible entre los distintos paquetes
	if [ -f /tmp/dstate ]; then
		echoAndLog "${FUNCNAME}(): Deleting unused files"
		rm -f /tmp/dstate
	fi
	# Crear nuevos ficheros de logrotate y borrar el fichero antiguo.
	if [ -d $LOGROTATEDIR ]; then
		rm -f $LOGROTATEDIR/opengnsys
		if [ ! -f $LOGROTATEDIR/opengnsysServer ]; then
			echoAndLog "${FUNCNAME}(): Creating logrotate configuration file for server"
			sed -e "s/OPENGNSYSDIR/${INSTALL_TARGET//\//\\/}/g" \
				$WORKDIR/opengnsys/server/etc/logrotate.tmpl > $LOGROTATEDIR/opengnsysServer
		fi
		if [ ! -f $LOGROTATEDIR/opengnsysRepo ]; then
			echoAndLog "${FUNCNAME}(): Creating logrotate configuration file for repository"
			sed -e "s/OPENGNSYSDIR/${INSTALL_TARGET//\//\\/}/g" \
				$WORKDIR/opengnsys/server/etc/logrotate.tmpl > $LOGROTATEDIR/opengnsysRepo
		fi
	fi
}

# Resumen de actualización.
function updateSummary()
{
	# Actualizar fichero de versión y revisión.
	local VERSIONFILE REVISION
	VERSIONFILE="$INSTALL_TARGET/doc/VERSION.json"
	# Obtener revisión.
	if [ $REMOTE -eq 1 ]; then
		# Revisión: rAñoMesDía.Gitcommit (8 caracteres de fecha y 7 primeros de commit).
		if [ "$BRANCH" = "master" ]; then
			REVISION=$(curl -s "$API_URL" | jq '"r" + (.commit.commit.committer.date | split("-") | join("")[:8]) + "." + (.commit.sha[:7])')
		else
			REVISION=$(curl -s "$API_URL" | jq '"r" + (.commit.committer.date | split("-") | join("")[:8]) + "." + (.sha[:7])')
		fi
	else
		# Parámetro "release" del fichero JSON.
		REVISION=$(jq -r '.release' $PROGRAMDIR/../doc/VERSION.json 2>/dev/null)
	fi
	[ -f $VERSIONFILE ] || echo '{ "project": "OpenGnsys" }' > $VERSIONFILE
	jq ".release=$REVISION" $VERSIONFILE | sponge $VERSIONFILE
	VERSION="$(jq -r '[.project, .version, .codename, .release] | join(" ")' $VERSIONFILE 2>/dev/null)"
	# Borrar antiguo fichero de versión.
	rm -f "${VERSIONFILE/json/txt}"

	echo
	echoAndLog "OpenGnsys Update Summary"
	echo       "========================"
	echoAndLog "Project version:                  $VERSION"
	echoAndLog "Update log file:                  $LOG_FILE"
	[ "$NEWFILES" ] && echoAndLog "Check new config files:           $(echo $NEWFILES)"
	[ "$NEWSERVICES" ] && echoAndLog "New compiled services:            $(echo $NEWSERVICES)"
	echoAndLog "Warnings:"
	echoAndLog " - You must to clear web browser cache before loading OpenGnsys page"
	echoAndLog " - Run \"settoken\" script to update authentication tokens"
	[ "$INSTALLEDOGLIVE" ] && echoAndLog " - Installed new ogLive Client: $INSTALLEDOGLIVE"
	echoAndLog " - Review syslog configuration and logrotate by syslog,"
	echoAndLog "      in debug mode OpenGnsys log is very extensive."

	echo
}



#####################################################################
####### Proceso de actualización de OpenGnsys
#####################################################################


# Comprobar si hay conexión y detectar parámetros de red por defecto.
checkNetworkConnection
if [ $? -ne 0 ]; then
	errorAndLog "Error connecting to server. Causes:"
	errorAndLog " - Network is unreachable, check device parameters"
	errorAndLog " - You are inside a private network, configure the proxy service"
	errorAndLog " - Server is temporally down, try again later"
	exit 1
fi
getNetworkSettings

# Elegir versión y comprobar si se intanta actualizar a una versión anterior.
chooseVersion
checkVersion
if [ $? -ne 0 ]; then
	errorAndLog "Cannot downgrade to an older version ($OLDVERSION to $NEWVERSION)"
	errorAndLog "You must to uninstall OpenGnsys and install desired release"
	exit 1
fi

echoAndLog "OpenGnsys update begins at $(date)"
pushd $WORKDIR

# Comprobar auto-actualización del programa.
if [ "$PROGRAMDIR" != "$INSTALL_TARGET/bin" ]; then
	checkAutoUpdate
	if [ $? -ne 0 ]; then
		echoAndLog "OpenGnsys updater has been overwritten"
		echoAndLog "Please, run this script again"
		exit
	fi
fi

# Detectar datos de auto-configuración del instalador.
autoConfigure

# Instalar dependencias.
installDependencies ${DEPENDENCIES[*]}
if [ $? -ne 0 ]; then
	errorAndLog "Error: you must to install all needed dependencies"
	exit 1
fi

# Arbol de directorios de OpenGnsys.
createDirs ${INSTALL_TARGET}
if [ $? -ne 0 ]; then
	errorAndLog "Error while creating directory paths"
	exit 1
fi

# Si es necesario, descarga el repositorio de código en directorio temporal
if [ $REMOTE -eq 1 ]; then
	downloadCode $CODE_URL
	if [ $? -ne 0 ]; then
		errorAndLog "Error while getting code from repository"
		exit 1
	fi
else
	ln -fs "$(dirname $PROGRAMDIR)" opengnsys
fi

# Comprobar configuración de MySQL.
checkMysqlConfig $OPENGNSYS_DBUSER $OPENGNSYS_DBPASSWORD

# Actualizar la BD.
updateDatabase

# Actualizar ficheros complementarios del servidor
updateServerFiles
if [ $? -ne 0 ]; then
	errorAndLog "Error updating OpenGnsys Server files"
	exit 1
fi

# Configurar Rsync.
rsyncConfigure

# Actualizar ficheros del cliente.
updateClientFiles
createCerts
updateInterfaceAdm

# Actualizar páqinas web.
apacheConfiguration
updateWebFiles
if [ $? -ne 0 ]; then
	errorAndLog "Error updating OpenGnsys Web Admin files"
	exit 1
fi
# Actaulizar ficheros descargables.
updateDownloadableFiles
# Generar páginas Doxygen para instalar en el web
makeDoxygenFiles

# Recompilar y actualizar los servicios del sistema
if ogServerCompilation; then
	# Restart services, if necessary.
	if [ "$NEWSERVICES" ]; then
		echoAndLog "Restarting OpenGnsys services"
		service="opengnsys" $STARTSERVICE
		service="ogserver" $STARTSERVICE
	fi
else
	errorAndLog "Error compiling OpenGnsys services"
	exit 1
fi

# Actaulizar ficheros auxiliares del cliente
updateClient
if [ $? -ne 0 ]; then
	errorAndLog "Error updating client files"
	exit 1
fi

# Update ogClient
if ! updateOgClient; then
	errorAndLog "Error updating ogClient files"
	exit 1
fi

# Comprobar permisos y ficheros.
checkFiles

# Mostrar resumen de actualización.
updateSummary

rm -rf $WORKDIR
echoAndLog "OpenGnsys update finished at $(date)"

popd