#!/bin/bash
# Author: Tomas M. <http://www.slax.org/>

if [ ! -e "$1" ]; then
   echo 
   echo "Convert .sb compressed module into directory with the same name"
   echo "Usage: $0 [source_file.sb] [[optional output_directory]]"
   echo "  If the output_directory is specified, it must exist"
   echo "  If the output_directory is not specified, the name source_file.sb"
   echo "  is used and the directory is overmounted with tmpfs"
   exit 1
fi

if [ ! -r "$1" ]; then
   echo "File does not exist: $1" >&2
   exit
fi

if [ "$2" = "" ]; then
   SOURCE="$1".x
   while [ -e "$SOURCE" ]; do SOURCE="$SOURCE"x; done
   mv "$1" "$SOURCE" || exit
   mkdir "$1"
   mount -t tmpfs tmpfs "$1"
   unsquashfs -f -dest "$1" "$SOURCE" >/dev/null || exit
   rm "$SOURCE"
else
   if [ ! -d "$2" ]; then
      echo "Directory does not exist: $2" >&2
      exit
   fi
   unsquashfs -f -dest "$2" "$1" >/dev/null
fi