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

usage()
{
   echo ""
   echo "---"
   echo "Convert directory to .sb compressed module"
   echo ""
   echo "Usage: $0 [source_directory.sb] [[target_file.sb]]"
   echo "  If source_directory does not have .sb suffix and it is not 'squashfs-root',"
   echo "  then the source_directory itself is included in the module and"
   echo "  then the target_file.sb parameter is required"
}

SB=$(echo "$1" | grep -o "[.]sb/*\$")
if [ "$(echo "$1" | grep -o "/squashfs-root/*\$")" != "" ]; then
   SB="true"
fi

if [ "$SB" = "" ]; then
   KEEP="-keep-as-directory"
   if [ "$2" = "" ]; then
      usage
      exit
   fi
else
   KEEP=""
fi


if [ ! -d "$1" ]; then
   echo "Not a directory: $1" >&2
   exit 2
fi


if [ "$2" = "" ]; then
   TARGET="$1".sb
   while [ -e "$TARGET" ]; do TARGET="$TARGET"x; done
   mksquashfs "$1" "$TARGET" -comp xz -b 512K $KEEP >/dev/null
   umount "$1" 2>/dev/null
   rmdir "$1" 2>/dev/null && mv "$TARGET" "$1" && exit
   echo "Created file $TARGET"
else
   if [ -e "$2" ]; then
      echo "Target exists: $2" >&2
      exit 3
   fi

   mksquashfs "$1" "$2" -comp xz -b 512K $KEEP >/dev/null
fi