Multi repo support

[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.

Comments are welcome.

Cheers,
Claudius

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