#!/bin/bash
# ----------
# llxcfg-regtool
# ----------
#
# Utilidad para actualizar el "registro de paquetes y scripts" que utiliza llxcfg-apt.
# Escrito por Luis Garcia Gisbert <garcia_luigis@gva.es> para LliureX (2006)
#

set -e

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

# ---------
# variables
# ---------
LLX_PKG_PREFIX="/var/lib/llxcfg/llxcfg-apt_pkg"
# ----
dpkg_db="${LLX_PKG_PREFIX}.db"
# ---
test_db(){
   [ -e ${dpkg_db} ] || echo "# llxcfg scripts/packages db" |llxcfg-install - ${dpkg_db}
}

termina(){
   echo "$1" 1>&2
   exit 1
}
usage(){
   termina "$0 SCRIPT [add|del|set|list] PACKAGE1 PACKAGE2 ...."
}

get_script_packages(){
   SCR_NAME="${1}"
   sed -ne "/^.*:.*${SCR_NAME}.*/s%:.*\$%%p" ${dpkg_db}
}

del_script_packages(){
   SCR_NAME="${1}"
   shift
   PKG_LIST="${@}"
   # si no se especifica parametro, se borran todos los paquetes asociados
   [ -z "${PKG_LIST}" ] && PKG_LIST="`get_script_packages ${SCR_NAME}`"
   SED_CMD=""
   for p in ${PKG_LIST}; do
      SED_CMD="${SED_CMD}/^${p}:${SCR_NAME}/s%:${SCR_NAME}[[:space:]]\?%:%\n"
      SED_CMD="${SED_CMD}/^${p}:.\+[[:space:]]${SCR_NAME}/s%[[:space:]]\+${SCR_NAME}[[:space:]]\?% %\n"
   done
   # control de paquetes huerfanos ..., ademas garantiza que se ejecuta sed (si no perderiamos el fichero)
   SED_CMD="${SED_CMD}/^.*:[[:space:]]*\$/d"
   echo -e "${SED_CMD}" |sed -f- ${dpkg_db}
}

add_script_packages(){
   SCR_NAME="${1}"
   shift
   PKG_LIST="${@}"
   SED_CMD=""
   for p in ${PKG_LIST}; do
      if grep -q "^${p}:" ${dpkg_db}; then
         # si existe lo borramos
	 SED_CMD="${SED_CMD}/^${p}:${SCR_NAME}/s%:${SCR_NAME}[[:space:]]\?%:%\n"
	 SED_CMD="${SED_CMD}/^${p}:.\+[[:space:]]${SCR_NAME}/s%[[:space:]]\+${SCR_NAME}[[:space:]]\?% %\n"
	 # y ahora lo añadimos
         SED_CMD="${SED_CMD}/^${p}:/s%.*\$%& ${SCR_NAME}%\n"
      else
         # si no esta el paquete se añade al final ...
         SED_CMD="${SED_CMD}\$a${p}:${SCR_NAME}\n"
      fi
   done
   # control de paquetes huerfanos ..., ademas garantiza que se ejecuta sed (si no perderiamos el fichero)
   SED_CMD="${SED_CMD}/^.*:[[:space:]]*\$/d"
   echo -e "${SED_CMD}" |sed -f- ${dpkg_db}
}

# ----
# main
# ----
# comprobaciones

[ "$1" ] || usage
SCR_NAME="$1"

shift
ACTION="$1"
[ "$1" ] || usage

shift

test_db

case "$ACTION" in
   add)
      [ "$1" ] || usage
      TMP_FILE="`tempfile`"
      add_script_packages "${SCR_NAME}" $@ > ${TMP_FILE}
      [ -e ${TMP_FILE} ] && llxcfg-install ${TMP_FILE} ${dpkg_db}
      rm -f ${TMP_FILE}
      ;;
   set)
      [ "$1" ] || usage
      TMP_FILE="`tempfile`"
      del_script_packages "${SCR_NAME}" > ${TMP_FILE}
      [ -e ${TMP_FILE} ] && llxcfg-install ${TMP_FILE} ${dpkg_db}
      add_script_packages "${SCR_NAME}" $@ > ${TMP_FILE}
      [ -e ${TMP_FILE} ] && llxcfg-install ${TMP_FILE} ${dpkg_db}
      rm -f ${TMP_FILE}
      ;;
   del)
      TMP_FILE="`tempfile`"
      del_script_packages "${SCR_NAME}" $@ > ${TMP_FILE}
      [ -e ${TMP_FILE} ] && llxcfg-install ${TMP_FILE} ${dpkg_db}
      rm -f ${TMP_FILE}
      ;;
   list)
      get_script_packages "${SCR_NAME}"
      ;;
   *)
      usage
      ;;
esac

exit 0