#!/bin/bash
# -------
# File:        llxcfg-apt
# Description: Script to stop and start llxcfg scripts on apt upgrades
# Author:      Sergio Talens-Oliag <sto@gva.es>
# Copyright:   (c) 2005 Sergio Talens-Oliag <sto@gva.es>
# Modified:    2006-02-28 Luis Garcia Gisbert <garcia_luigis@gva.es>
#              2007-04-23 Luis Garcia Gisbert <garcia_luigis@gva.es>:
#              Current version is intended to be used by llxcfg-apt-scripts
# 
# 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 2 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, write to the Free Software Foundation, Inc., 
# 51 Franklin St, Fifth Floor, Boston MA 02110-1301 USA
# --------

set -e

PATH="/usr/sbin:/usr/bin:/sbin:/bin"


# ---------
# variables
# ---------
dpkg_db="/var/lib/llxcfg/llxcfg-apt_pkg.db"
# ---
CONFDIR="/etc/llxcfg"
SCR_ENABLED="scripts-enabled"
ENABLEDIR="$CONFDIR/$SCR_ENABLED"

get_script_list(){
# Funcion: get_script_list STATUS_FILE
#
# Descripcion:
# Procesa el "status file" de paquetes que se le pasa y devuelve los nombres de los
# scripts implicados (si hay alguno).
# Para ello se utiliza la lista de paquetes/scripts asociados almacenada 
# en el fichero "${LLX_PKG_PREFIX}.db"
# NOTA: La lista PUEDE tener duplicados ...
   [ -e "${1}" -a -e "${dpkg_db}" ] && generate_sed_script ${1} |sed -n -f- ${dpkg_db}
   return 0
}

generate_sed_script(){
# Funcion: generate_sed_script STATUS_FILE
#
# Descripcion:
# Toma como argumento un "status file" de paquetes y
# genera la lista de comandos de sed para buscar en 
# el fichero ${LLX_PKG_PREFIX}.db

   sed -ne "s/\([^[:space:]]*\).*/s%^\1:%%p/p" ${1}
}

run_scripts(){
# Funcion: run_scripts pre-dpkg|post-dpkg
#
# Descripcion:
# Primero se obtiene la lista de scripts a partir del "status file" de paquetes correspondiente
# Después, para cada uno de los scripts de la lista, tras comprobar si está activo,
# se activan/desactivan las configuraciones y los servicios asociados
    ACTION="$1"
    STATUS_FILE="$dpkg_status"
    
    CANDIDATE_SCRIPTS="`get_script_list ${STATUS_FILE}`"

    SCRIPTS_LIST=""
    for SCR in ${CANDIDATE_SCRIPTS}; do
       SCRIPT_FILE="${ENABLEDIR}/${SCR}"
       if [ -x ${SCRIPT_FILE} ] && ! echo " ${SCRIPTS_LIST} " |grep -q " ${SCR} " ; then
	  # mantenemos la lista SCRIPTS_LIST para evitar duplicidades
          SCRIPTS_LIST="${SCRIPTS_LIST} ${SCR}"
          SERVICES=`${SCRIPT_FILE} services`
	  case "$ACTION" in
	     post-dpkg)
		${SCRIPT_FILE} start || /bin/true
	        for s in $SERVICES; do
		   invoke-rc.d --quiet $s restart || /bin/true
		done
		;;
	     pre-dpkg)
	        for s in $SERVICES; do
		   invoke-rc.d --quiet $s stop || /bin/true
		done
		${SCRIPT_FILE} stop || /bin/true
		;;
	  esac
       fi
    done
    [ "$ACTION" = "post-dpkg" ] && rm -f ${STATUS_FILE}
}

# ----
# main
# ----
INITDSCR="/etc/init.d/llxcfg"
dpkg_status="$2"
case "$1" in
   pre-dpkg)
      if [ "${dpkg_status}" -a -e "${dpkg_db}" -a -e "${dpkg_status}" ]; then 
         run_scripts pre-dpkg
      else
         # si no existe el fichero, revertimos al comportamiento original de llxcfg-apt
         [ -x "$INITDSCR" ] || exit 0
         SERVICES=`$INITDSCR services`
         for s in $SERVICES; do
	    invoke-rc.d $s stop
	 done
	 $INITDSCR stop
      fi
      ;;
   post-dpkg)
      if [ "${dpkg_status}" -a -e "${dpkg_db}" -a -e "${dpkg_status}" ]; then 
         run_scripts post-dpkg
      else
         # si no existe el fichero, revertimos al comportamiento original de llxcfg-apt
         [ -x "$INITDSCR" ] || exit 0
         SERVICES=`$INITDSCR services`
         $INITDSCR start
	 for s in $SERVICES; do
	    invoke-rc.d $s restart
	 done
      fi
      ;;
esac

exit 0