[OE-core] [Openembedded-architecture] LAYERSERIES

[Scott Rifenbark]

We have this variable appearing in a couple manuals BTW.  If anyone has any
feedback on what is being said here I can update.

Thanks,
Scott

https://www.yoctoproject.org/docs/2.5/ref-manual/ref-manual.html#var-LAYERSERIES_COMPAT
https://www.yoctoproject.org/docs/2.5/dev-manual/dev-manual.html#creating-your-own-layer



On Fri, Apr 6, 2018 at 8:29 AM, Richard Purdie <
richard.purdie at linuxfoundation.org> wrote:

> On Fri, 2018-04-06 at 10:16 -0400, Trevor Woerner wrote:
> > A) Some layers only switch to an official branch name when the find a
> > reason to. E.g. branch "sumo" is created on openembedded-core but
> > meta-A keeps working on master unless an incompatible change is
> > created in openembedded-core that forces meta-A to create a "sumo"
> > branch.
> >
> > B) Other layers create official branches the moment they exist. E.g.
> > branch "sumo" is created on openembedded-core and meta-B instantly
> > creates a "sumo" branch to mark this point in time, and continues
> > working on master. If meta-B's "sumo" branch fails to build against
> > openembedded-core's "sumo" branch because an incompatible change is
> > made to openembedded-core's sumo branch, meta-B fixes the issue on
> > the sumo branch.
> >
> >
> > I can see how the change you've implemented will be very useful for
> > the A)
> > cases. Will it be needed for the B) cases? In other words, does the
> > code
> > you're adding implicitly assume:
> >
> >       LAYERSERIES_COMPAT_<...> = "layer"
> >
> > for any given "layer"?
>
> No, there is no implicit assumption.
>
> In both A) and B) cases the maintainer adds the new "codename" to the
> list of compatible layer series in LAYERSERIES_COMPAT_<layer> for their
> layer. They can list multiple layers in there, e.g. "rocko sumo".
>
> The one annoying thing about all this is the layer maintainers do have
> to update layer.conf each time a new release codename comes out. I
> think that is a reasonable compromise to be able to give users a much
> better idea of which layers are compatible or incomaptible with their
> setup though. It means someone has looked at it and believes it will
> work with a given release series.
>
> Just to be clear, "layer" would never be a valid value there, it will
> always be the release/branch codenames.
>
> Cheers,
>
> Richard
>
>
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