anchor.diff:  }
   
   function unpack_payload(){
  -    if $FORCE || [ ! "$(ls -A $INSTALL_DIR)" ] ; then
  +    if [ "$FORCE" == "1" ] || [ ! "$(ls -A $INSTALL_DIR)" ] ; then
           log "Unpacking payload . . ."
           local archive_line=$(grep -a -n -m1 '__ARCHIVE__$' $0 | sed 's/:.*//')
           tail -n +$((archive_line + 1)) $0 | tar -C $INSTALL_DIR -xf - > /dev/null || die "Failed to unpack payload from the end of '$0' into '$INSTALL_DIR'"
  
positive.code: 
      unpack_payload
  
      if [[ -n $UNPACK_ONLY ]] ; then
          echo "Unpacking complete, not moving symlinks or restarting because unpack only was specified."
      else
          create_symlinks
  
negative.code:     if [ -r $AFTER_INSTALL ] ; then
          chmod +x $AFTER_INSTALL
          log "Running post install script"
          log $($AFTER_INSTALL)
          return $?
      fi
      return 0
  