Inverse of BBFILES_DYNAMIC

* Inverse of BBFILES_DYNAMIC
@ 2019-12-18 20:10 Konrad Weihmann
  2019-12-18 21:59 ` [yocto] " Yann Dirson
  0 siblings, 1 reply; 3+ messages in thread
From: Konrad Weihmann @ 2019-12-18 20:10 UTC (permalink / raw)
  To: 'yocto@lists.yoctoproject.org'

Hi All,

I was wondering if there is already a mechanism which kind of mimics the inverse of BBFILES_DYNAMIC.
Like I want a recipe to be put into tree only if a layer is absent.

Example: I need a fancy python-lib, which isn't part of the core-lib, but according to the layer index can be obtained by some 3rd party layer (let's call fancy-layer).
For some projects I worked for, it might be challenging to use "fancy-layer" as it doesn't comply with some corporate rules or whatsoever, while others don't see any issues here.

What I have in mind is a mechanism like BBFILES_DYNAMIC, but inverse, like

BBFILES_DYNAMIC += "!fancy-layer: ${LAYERDIR}/dynamic-layers/fancy-fallback/*/*.bb"

So in case fancy-layer is absent, I could put in a recipe which isn't that well maintained (also might including a warning that this only a fallback solution), but does make my layer usable for a wider audience.

So back to the original question, is that already existing functionality? Or is there a workaround hack existing?
If both not, is that something, that could be considered as valuable by the project (If so I could craft some patches for that)?

Regards
Konrad

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