[yocto] How to check list of installed packages to stop the build process conditionally

[Iván Castell]

Hello forum.

My layer provides two custom recipes A and B with exactly the same
functionality. To get a working image, one of these two recipes must be
included on the generated image (A_installed XOR B_installed).

So I need the build process being able to check the list of installed
packages, stopping the build process in case any of these two packages is
included.

Does yocto provides some mechanism to manage this issue?

Thank you in advance!
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