[yocto] Navigating the layer labyrinth

[Aaron Schwartz]

 Hello,

I am not sure if you've found the OpenEmbedded Layer Index [0] yet, but
that's a good resource and an example of what can be done.  I believe the
source code is available [1] and I've toyed with the idea of getting it
working locally (although I've not had the time to do so).

That could be a part of what you're looking for, at least.

Hope that helps,
Aaron



0) https://layers.openembedded.org/layerindex/branch/master/recipes/
1) http://git.yoctoproject.org/cgit/cgit.cgi/layerindex-web/tree/layerindex


On Thu, Oct 12, 2017 at 5:34 AM, Bernd <prof7bit at gmail.com> wrote:

> I am a new user for a few weeks now, trying to make a customized image
> for a toradex colibri-vf module, so far I have succeeded in the
> following disciplines:
>
> * adding the 3rd party layers that I need
> * making my own layers
> * using a .bbappend to patch the device tree
> * using a .bbappend to workaround a bug(?) in one of the freescale layers
> * writing my own recipe to install a python script
> * writing recipes for pulling additional python packages with pypi and
> setuptools3
> * writing my own image recipe
> * making it boot and run on the target platform
>
> During this learning experience I have made the following observations
> of circumstances that made it especially hard for me to get things
> done, I'm not yet really sure if this is a documentation issue or if
> it is really a missing feature but I feel I could have had a much
> *much* easier time learning and understanding the concepts and
> relationships and the inner workings of existing layers upon which I
> want to build my system if the following things were possible (and/or
> if they are already possible they should be documented in the very
> first chapter of the documentation):
>
> * Finding the *file path* of an existing recipe (or append file or
> class) *by its name* and also all existing .bbappends for it, i
> imagine something simple like bitbake --show-paths foo-bar would
> output me the small list of absolute paths of recipe files by the name
> foo-bar and all matching .bbappend files in the order in which they
> would be applied, it would show me only this small list of paths and
> not dump 100kb of unrelated information along with it. This would be
> incredibly helpful when I need to inspect an existing recipe in order
> to understand how I can bbappend it or even just to see and understand
> what it actually does.
>
> * A simple way to track the assignment of a certain variable, to
> inspect its contents and if it refers to other variables then
> recursively show their contents too (and also the path of the bb file
> where this happens), and also show which other recipes will directly
> and indirectrly depend on this variable further down the line, I
> imagine this should output two tree-like structures where one can see
> at one glance how and where all the contents of that variable come
> from and where they are going to be used. Again this should be a
> simple command that formats and outputs that (and only that)
> information in a well formatted and compact tree-like representation.
>
> * The absolute killer application would be an IDE or an editor plugin
> where I open any .bb file and can then just CTRL-click on any include,
> require, inherit, depend, rdepend, or any variable name and it would
> open another editor containing that recipe file where it is defined
> and/or populate a sidebar with a list or a tree of direct and indirect
> references to that name, backward and forward, and I could just click
> on any node of that tree an and it would open the file in the editor
> and jump to that line of code. Such a thing would be an incredibly
> helpful tool, it would make even the most complex and tangled
> labyrinth of recipes navigable with ease.
>
> Please tell me that such a thing already exists and I just have not
> found it yet.
>
> Bernd
> --
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-- 

Aaron Schwartz
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Logic Supply
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