Re: Multi repo support

[Jan Kiszka <jan.kiszka@siemens.com>]

On 2018-02-07 10:05, [ext] Claudius Heine wrote:
> 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?

https://manpages.debian.org/stretch/multistrap/multistrap.1.en.html#Apt_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.

As discussed offline, this sounds like valuable add-on for later. Until
then, the user should be able to replace repo lists that are pointing to
undesired URLs with own ones with the preferred URLs.

Jan

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