fix: Use temporary file when extracting ROM (#352)

if [ ! -s "$DEST.rom" ] || [ ! -f "$DEST.rom" ]; then

  [ ! -s "$OVMF/$ROM" ] || [ ! -f "$OVMF/$ROM" ] && error "UEFI boot file ($OVMF/$ROM) not found!" && exit 44

  cp "$OVMF/$ROM" "$DEST.rom"

  if [[ "${LOGO:-}" != [Nn]* ]]; then

    /run/utk.bin "$DEST.rom" replace_ffs LogoDXE "/var/www/img/macos.ffs" save "$DEST.rom"

  if [[ "${LOGO:-}" == [Nn]* ]]; then

    cp "$OVMF/$ROM" "$DEST.tmp"

  else

    /run/utk.bin "$OVMF/$ROM" replace_ffs LogoDXE "/var/www/img/${PROCESS,,}.ffs" save "$DEST.tmp"

  fi

  mv "$DEST.tmp" "$DEST.rom"

fi

if [ ! -s "$DEST.vars" ] || [ ! -f "$DEST.vars" ]; then

  [ ! -s "$OVMF/$VARS" ] || [ ! -f "$OVMF/$VARS" ]&& error "UEFI vars file ($OVMF/$VARS) not found!" && exit 45

  cp "$OVMF/$VARS" "$DEST.vars"

  cp "$OVMF/$VARS" "$DEST.tmp"

  mv "$DEST.tmp" "$DEST.vars"

fi

BOOT_OPTS+=" -drive if=pflash,format=raw,readonly=on,file=$DEST.rom"