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

usage()
{
   echo ""
   echo "Convert directory to .sb compressed module"
   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."
   echo "  If target_file.sb is not specified, the source_directory is erased"
   echo "  and replaced by the newly generated module file."
}

P1="$(readlink -f "$1")"
P2="$(readlink -f "$2")"

if [ "$P1" = "$P2" ]; then
   P2=""
fi

SB=$(echo "$P1" | grep -o "[.]sb/*\$")
if [ "$(echo "$P1" | grep -o "/squashfs-root/*\$")" != "" ]; then
   SB="true"
fi

if [ "$SB" = "" ]; then
   KEEP="-keep-as-directory"
   if [ "$P2" = "" ]; then
      usage
      exit 1
   fi
else
   KEEP=""
fi

if [ ! -d "$P1" ]; then
   echo "Not a directory: $P1" >&2
   exit 2
fi


if [ "$P2" = "" ]; then
   TARGET="$P1".sb
   while [ -e "$TARGET" ]; do TARGET="$TARGET"x; done
   mksquashfs "$P1" "$TARGET" -comp xz -b 1024K -always-use-fragments $KEEP >/dev/null || exit 3
   umount "$P1" 2>/dev/null
   rm -Rf "$P1"
   mv "$TARGET" "$P1"
else
   if [ -e "$P2" ]; then
      echo "Target exists: $P2" >&2
      exit 4
   fi

   mksquashfs "$P1" "$P2" -comp xz -b 1024K -always-use-fragments $KEEP >/dev/null
fi