[yocto] Build Flavors help.

[Khem Raj]

On (28/02/13 14:43), Tim O'Callaghan wrote:
> Hi all,
> 
> I've been digging through the documentation, and dipping into the recipes, but have not been able to come up with a definitive approach to managing what I call different build flavors. I am using the term flavor to distinguish it from the 'variant' term mentioned in the docs, at least not as I currently understand what BB thinks is a variant. 
> 
> Essentially I want to be able to create one recipe for a given image, then during build feed the recipe flavor information to create a different image per flavor. 
> An example would be to be that I want to create 30 images each with its own splash screen, host name, IP etc, without having to create 30 different recipes.
> 
> The example I examined is code in the psplash recipe, which can create a different installable packages based on the SPLASH_IMAGES variable, which can then be mixed into an image recipe. 
> 
> I can see how that method can be applied to create package flavors, but how would I go about image flavors? If I have to dig into the BB/Poky code, where should I start looking? I'm guessing the best approach is to build a helper class I can include in package and image recipes that I want to add flavor to? 
> 

there is ROOTFS_POSTPROCESS_COMMAND for tweaking images after the fact.
Take a look at core-image.bbclass you still would need 30 image recipes
though, another thing you could try is bundle all splash images into
one package and _somehow_ use the right one when booting the image on
a given device.