initrd/init:prepend_dir() (tahrpup)

prepend_dir() { #SAVE_LAYER=/pup_ro1  #Line 677 of initrd/init
 rm -rf ${SAVE_LAYER}/tmp #in case last boot was pupmode=12
 #adjust stack
 echo "mount -o remount,add:1:${SAVE_LAYER}=ro+wh /pup_new" #debug
 mount -o remount,add:1:${SAVE_LAYER}=ro+wh /pup_new #ro+wh = Readonly branch and it has/might have whiteouts on it
 if [ $? -eq 0 ];then
  [ $PUPMODE -ne 77 ] && KEEPMOUNTED="${KEEPMOUNTED}${SAVEPART} "
  [ "$SAVE_NAME" ] && NEWUNIONRECORD="$SAVE_NAME $NEWUNIONRECORD"
 else
  printf "${L_ADDING_SAVE_LAYER_FAILED}\n" "$SAVE_LAYER"
 fi
}