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

[Christopher Baines]

Simon Tournier <zimon.toutoune@gmail.com> writes:

> Hi Chris,
>
> On Fri, 17 Nov 2023 at 21:39, Christopher Baines <mail@cbaines.net> wrote:
>
>> 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])
>
> Do you mean that the drv file is generated using a new daemon then this
> drv file is “offloaded” to another machine using an older daemon and
> thus fails to build it?

Roughly, yep.

>> 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.
>
> Other solutions are: downgrade the daemon of one of the machine or
> update the daemon of other machines, no?
>
> Why would the latter not be possible?

It's possible, just difficult. Because with the current guix-daemon, the
build coordinator can only build things that can be GC'd, some machines
deliberately run older daemons to allow building newer things without
hitting this issue.

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