Re: [ptxdist] [RFC PATCH] doc: Add section on creating new layers

[Alexander Dahl <ada@thorsis.com>]

Hei hei,

Am Dienstag, 3. September 2019, 15:08:08 CEST schrieb Michael Olbrich:
> On Tue, Sep 03, 2019 at 02:22:04PM +0200, Alexander Dahl wrote:
> > Am Dienstag, 3. September 2019, 14:00:17 CEST schrieb Roland Hieber:
> > > On Tue, Sep 03, 2019 at 01:50:25PM +0200, Alexander Dahl wrote:
> > > > +
> > > > +#. If needed select **ptxconfig** and/or **platformconfig** after
> > > > copying
> > > > +   that file from the lower layer to your new layer:
> > > > +
> > > > +.. code-block:: text
> > > > +
> > > > +   $ mkdir -p configs/platform-v7a
> > > > +   $ cp base/configs/platform-v7a/platformconfig
> > > > configs/platform-v7a/
> > > > +   $ ptxdist platform configs/platform-v7a/platformconfig
> > > 
> > > I think you should be able to select the config from base/ directly
> > > without copying them? mol?
> > 
> > I did not try that. What is possible to select would be indeed an
> > interesting piece in the docs! That question came up multiple times in
> > IRC in the last days. ;-)
> 
> If there is just on platform, then ptxdist will just use that on if no
> selected_platformconfig exists. This is especially useful with layers,
> because it will then just pick the config from the first layer that has
> one.

So this is not different to ptxdist behaviour without layers. Maybe DistroKit 
is no good example, because it contains more than one platform and you must 
select one to get going?

> This means, that you can start with just the base link. Then change
> something with 'ptxdist platformconfig'. PTXdist will create the
> platformconfig in your new layer and use it automatically.
> 
> The same works for the ptxconfig as well.
> 
> Note: ptxdist will delete the config if it is identical to the layer below.

I think this is very convenient. This makes creating a new layer even easier, 
at least for BSPs with exactly one ptxconfig and exactly one platformconfig.

> It does not touch the selected_* links you might need to change those if it
> happens.

So the question remains. If there is more than one platform or config, where 
should it be selected best and how?

Greets
Alex


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