Add support for first xfw boot slideshow

scripts/update.py

@@ -10,6 +10,7 @@ import shutil
 import zlib
 import tarfile
 import math
+import pathlib
 
 from slideshow import Main as SlideshowMain
 
@@ -137,6 +138,12 @@ class Main(App):
                 return 2
 
         if self.args.splash:
+            SlideshowMain(no_exit=True)([
+                "-i",
+                str(pathlib.Path(self.args.splash).parent / "xfwfirstboot"),
+                "-o",
+                join(self.args.directory, "xfwfirstboot.bin"),
+            ])
             splash_args = [
                 "-i",
                 self.args.splash,