bug#67250: builtin:git-download capability detection not working for the bordeaux build farm

[Christopher Baines]

Christopher Baines <mail@cbaines.net> writes:

> Ludovic Courtès <ludo@gnu.org> writes:
>
>> Hi,
>>
>> Christopher Baines <mail@cbaines.net> skribis:
>>
>>> The bordeaux build farm depends on computing the derivations on one
>>> machine, then potentially building them on a different machine.
>>>
>>> Some of the build machines don't have a new enough guix-daemon that
>>> understands builtin:git-download, so derivations that use this are
>>> sometimes failing (e.g. [1])
>>>
>>> 1: https://bordeaux.guix.gnu.org/build/10cc5622-6b1f-4f28-ad9a-41cf796d7a15
>>>
>>> One potential approach to address this is somehow have the data service
>>> indicate that it wants compatible derivations when computing them,
>>> rather than to have guix do feature detection against the guix-daemon
>>> that is being used at the point the derivations are being computed.
>>
>> Would it work for you if we added a keyword argument to
>> ‘open-connection’ in (guix store) that would let you select which
>> builtins to use?
>>
>> As in:
>>
>>   (open-connection
>>     #:assume-available-builtin-builders '("download"))
>
> Yep, that would at least allow freezing the available builtins going
> forward and separating it from the running daemon.

I've now sent some patches which add this option to #71038.

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