#!/bin/bash
# -------
# File:        llxcfg-getboot
# Description: Simple script to read variables from kernel boot
#              cmdline
#
#              July 2006, Luis Garcia <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

# FUNCTIONS
usage(){
   echo "Usage: $0 [--test] VARIABLE_NAME" >&2
   exit 1
}

test_parameter() {
   local PARAM_NAME="$1"
   shift
   while [ "$1" ]; do
      echo "$1" |grep -q "^${PARAM_NAME}\(=.*\)\?\$" && return 0
      shift
   done
   return 1
}

get_parameter() {
   local RET_VALUE="" PARAM_NAME="$1"
   shift
   while [ "$1" ]; do
      if echo "$1" |grep -q "^${PARAM_NAME}=" ; then
         RET_VALUE="` echo "$1" |sed -ne "s%^${PARAM_NAME}=%%p"`"
      fi
      shift
   done
   echo "${RET_VALUE}"
   return 0
}
      
# MAIN PROGRAM

# Initial test
if [ "$1" = "--test" ] ; then
   shift
   [ -z "$1" ] && usage
   test_parameter $1 `cat /proc/cmdline` || exit 1
else
   [ -z "$1" ] && usage
   get_parameter $1 `cat /proc/cmdline`
fi
exit 0