#!/bin/bash
# -------
# File:        llxcfg-apt-scripts
# Description: Script to stop and start llxcfg apt scripts
# Author:      Luis Garcia Gisbert <garcia_luigis@gva.es>
# 
# 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
# ---------
LLX_PKG_PREFIX="/var/lib/llxcfg/llxcfg-apt_pkg"
LLX_PKG_STATUS_PREFIX="${LLX_PKG_PREFIX}-status"
dpkg_status="${LLX_PKG_STATUS_PREFIX}.dpkg"

# library
LLX_COMMONLIB="/usr/share/lliurex/llxcfg-common/llxcfg-common.sh"
[ -f "${LLX_COMMONLIB}" ] || exit 1
. ${LLX_COMMONLIB}

# Funcion: parse_pre_install_pkgs
# 
# Descripcion:
# Genera el fichero ${dpkg_status} ("package status file") que contiene
# todos los paquetes que van a modificarse (install/update/remove).
#
# Las líneas del fichero son de la forma:
# 
#   PACKAGE ACTION
# 
# Donde 'ACTION' es '+' si el paquete se instala/actualiza o '-' si se elimina.
#
# Esta función fue escrita originalmente por Sergio Talens-Oliag <sto@debian.org>
# para la utilidad "cddt-apt" de su paquete cddt-runtime. La versión incluida
# en este script fue modificada y adaptada por Luis Garcia <garcia_luigis@gva.es>
# para el paquete llxcfg-runtime de LliureX.
#

parse_pre_install_pkgs() {
  local TMPFILE="`tempfile -s -ll-apt`"
  local TMPFILE2="`tempfile -s -ll-apt`"
  # Save the status file
  cat > $TMPFILE;
  
  # Check if it is a VERSION 2 file or exit without error
  if [ "`head -1 $TMPFILE`" != "VERSION 2" ]; then
    rm -f $TMPFILE
    rm -f $TMPFILE2
    return 0
  fi
  
  # Remove the unneded elements of the file, that leaves a file with lines of
  # the form:
  #
  #   package ACTION
  #
  # where ACTION is '+' for install/updates and '-' for removals.
  sed -e "/^VERSION 2/,/^$/ { d }; \
    s/^\([^ ]*\) [^ ]\+ . \([^ ]\+\) [^ ]\+$/\1 \2/; \
    s/ [^-].*$/ +/" "$TMPFILE" \
  | sort -u > "$TMPFILE2"
  
  # Compute the list of packages that have to be installed on the
  # postinvoke step
  
  # Check if any of the old files has been removed
  if [ -f "$dpkg_status" ]; then
    sed -n -e '/ -$/ { s/^\(.*\) -/^\1$/; p };' \
    | grep -v -f- "$dpkg_status" > "$TMPFILE" || true
  else
    cat /dev/null > "$TMPFILE"
  fi
  
  # Generate the final list of packages that have to be installed.
  cat "$TMPFILE" "$TMPFILE2" | sort -u > "$dpkg_status"
  
  # Remove the temporary files, as they are no longer needed
  rm -f "$TMPFILE" "$TMPFILE2";
}

run_scripts(){
# Funcion: run_scripts pre-dpkg|post-dpkg
#
# Descripcion:
# Se ejecutan los scripts de apt
# Los scripts reciben como primer parámetro 'pre-dpkg|post-dpkg'.
# El segundo parámetro es opcional y consiste es la ruta completa 
# a la lista de paquetes (si existe dicho fichero).
# Si el parámetro es 'post-dpkg', tras ejecutar los scripts, se
# borra la lista de paquetes.

    ACTION="$1"
    rc=0
    if [ -e "$dpkg_status" ] ; then
       llxscr_run "apt" "$ACTION" "$dpkg_status" || rc=$?
    else
       llxscr_run "apt" "$ACTION" || rc=$?
    fi
    [ "$ACTION" = "post-dpkg" ] && rm -f ${dpkg_status}
    return 0
}

usage(){
   CMD_NAME="$(basename "$0")"
   echo "Usage: $CMD_NAME [OPTIONS] {pre-install-pkgs|post-invoke}" >&2
   echo "       $CMD_NAME {enable|disable} SCRIPT_NAME [RUN_ORDER]" >&2
   echo "       $CMD_NAME {allow|deny} SCRIPT_NAME" >&2
   echo "       OPTIONS: --stop-on-error, --log-dir=LOG_DIRECTORY" >&2
   return 0
}

# ----
# main
# ----

SCRTYPE="apt"
SCRTOOL="/usr/sbin/llxcfg-script"

MODE_VARS="UBIQUITY_MODE"
eval `/usr/sbin/llxcfg-showvars $MODE_VARS`

if [ $UBIQUITY_MODE ] && [ "$UBIQUITY_MODE" = "Y" ]; then
   exit 0
fi

while echo "$1" |grep -q "^--" ; do
   case "$1" in
      --stop-on-error)
         LLXSCR_STOP_ON_ERROR="Y"
         ;;
      --log-dir=*)
         LLXSCR_LOG_DIR="${1#*=}"
         ;;
   esac
   shift
done

case "$1" in
   pre-install-pkgs)
      parse_pre_install_pkgs
      run_scripts pre-dpkg
      ;;
   post-invoke)
#      if [ -e ${dpkg_db} -a -e ${dpkg_status} ]; then 
      run_scripts post-dpkg
      ;;
   enable|disable|allow|deny)
      if [ -z "$2" ] ; then
         usage
         exit 1
      fi
      ${SCRTOOL} "$SCRTYPE" "$@" || exit $?
      ;;
   *)
      usage
      exit 1
      ;;
esac

exit 0