Re: Multi repo support

[Claudius Heine <claudius.heine.ext@siemens.com>]

Hi,

On 02/01/2018 03:54 PM, [ext] Claudius Heine wrote:
> 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.
> 
> Comments are welcome.

So for reference here are the points gathered from the comments in this 
thread:

   - It needs some way to handle package name collision. For instance if
     custom packages have the same name as an upstream package.
     Suggestion: Use apt-preferences to prefer packages from the 'isar'
                 repo. To consider: How to teach multistrap about those
                 preferences?
   - Overwriting source entries with local mirrors.
     Suggestion: Similar to how oe does it with PREMIRRORS.
                 e.g. DEBIAN_APT_MIRROR_append = "regex replace\n"
                 To be implemented later.

Cheers,
Claudius

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