Re: Multi repo support

[Claudius Heine <ch@denx.de>]

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Hi,

On Thu, 2018-02-01 at 19:34 +0100, Henning Schild wrote:
> Am Thu, 1 Feb 2018 16:16:58 +0100
> schrieb "[ext] Henning Schild" <henning.schild@siemens.com>:
> 
> > Am Thu, 1 Feb 2018 15:54:26 +0100
> > schrieb "[ext] Claudius Heine" <claudius.heine.ext@siemens.com>:
> > 
> > > Hi,
> > > 
> > > I would like to start the discussion about how to best implement
> > > muti repository support in isar.
> > > 
> > > Does someone already has some ideas or even something in the
> > > pipeline for this?
> > > 
> > > If not then I do have an idea that was outlined together with
> > > Jan:
> > > 
> > > Adding and configuring apt repositories should be done via config
> > > files. It should be possible to define own multiconfigs while
> > > including multiconfigs from other layers. These configs then
> > > append
> > > filepaths to a global variable.
> > > 
> > > Every file that is added this way contains 'sources.list'
> > > compatible repository definitions. So one repo each line.
> > > 
> > > For every line in those files a repository entry for
> > > multistrap.conf
> > > is created. Here we might need some more complex code to convert
> > > such a apt repo tripel to the right format multistrap expects.
> > > But
> > > by using the 'sources.lists' format we would be independent of
> > > multistrap and become more future proof.
> 
> We will also need a way to tell apt the priorities of these repos.
> Multistrap just adds them and apt-get installs packages according to
> its default behavior.
> That means that a package with the same name and version will get
> picked from a "random" repo. Overlays will need to make sure to
> always
> have a greater version or we will need apt configuration.
> https://wiki.debian.org/AptPreferences
> The big question here is how/whether multistrap will handle apt
> preference.
> 
> Alex already ran into that when he wanted to modify "hello". Renaming
> packages - like Alex suggested - is not the way to go. Because the
> ones
> we do overlay could be deps of packages we do not overlay.

Thanks, yes that is a very good point.

I would prefer the apt preferences settings. Maybe handle it similar to
how I proposed the multi-repo support. A global variable where apt
preference file paths are appended.

If multistrap cannot support them with a reasonable complex conversion
script then it might be time to say multistrap goodbye.

Claudius

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