Re: bug#74204: [bug#74112] Guix is not reproducible

Re: bug#74204: [bug#74112] Guix is not reproducible

[Simon Tournier]

Hi,

On Tue, 05 Nov 2024 at 23:25, Hilton Chain via Bug reports for GNU Guix <bug-guix@gnu.org> wrote:

>> I can confirm the reproducibility issue.
>>
>> I have two x86_64-linux machines building guix to verify the fix, I'll apply
>> your patch once they produce matching outputs.
>
> Took me quite a while to build 5 rounds. :)
>
> --8<---------------cut here---------------start------------->8---
> $ guix hash --serializer=nar /gnu/store/fs7x07jfn7igpkwv3alrs9by21q70y13-guix-1.4.0-26.5ab3c4c
> 0kh87wb4qn97kwzrf4igal71cjvv143j6jr2y3dwfzcy1madj1ll
> --8<---------------cut here---------------end--------------->8---
>
> Applied #74112 as 4c56d0cccdc44e12484b26332715f54768738c5f, thanks!

Maybe I am missing something.  To my knowledge, .go files produced by
Guile are not always reproducible, see bug#20272 [1].  And, from my
understanding, Guix cannot be reproducible until this bug had been
fixed.  Therefore, I am not convinced that this patch is worth under
this frame considering the build-time penalty it brings.

That’s said, maybe it’s better than nothing and the package ’guix’ is
barely built after all.  I do not know.

What people think?

Cheers,
simon

1: https://issues.guix.gnu.org/issue/20272

Re: bug#74204: [bug#74112] Guix is not reproducible

[Maxim Cournoyer]

Hi Simon,

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

> Hi,
>
> On Tue, 05 Nov 2024 at 23:25, Hilton Chain via Bug reports for GNU Guix <bug-guix@gnu.org> wrote:
>
>>> I can confirm the reproducibility issue.
>>>
>>> I have two x86_64-linux machines building guix to verify the fix, I'll apply
>>> your patch once they produce matching outputs.
>>
>> Took me quite a while to build 5 rounds. :)
>>
>> --8<---------------cut here---------------start------------->8---
>> $ guix hash --serializer=nar /gnu/store/fs7x07jfn7igpkwv3alrs9by21q70y13-guix-1.4.0-26.5ab3c4c
>> 0kh87wb4qn97kwzrf4igal71cjvv143j6jr2y3dwfzcy1madj1ll
>> --8<---------------cut here---------------end--------------->8---
>>
>> Applied #74112 as 4c56d0cccdc44e12484b26332715f54768738c5f, thanks!
>
> Maybe I am missing something.  To my knowledge, .go files produced by
> Guile are not always reproducible, see bug#20272 [1].  And, from my
> understanding, Guix cannot be reproducible until this bug had been
> fixed.  Therefore, I am not convinced that this patch is worth under
> this frame considering the build-time penalty it brings.
>
> That’s said, maybe it’s better than nothing and the package ’guix’ is
> barely built after all.  I do not know.
>
> What people think?

Perhaps we should set the default parallel-build? to #f in the
guile-build-system at least in the meantime, with a prominent comment as
to why and a reference to the upstream issue?  Many Guile packages use
the gnu-build-system so that wouldn't cover all of them like
'guix'... I'm not sure.

It'd be nicer to fix the underlying guile issue (again?), but I doubt
many people are up to this.

-- 
Thanks,
Maxim

Re: bug#74204: [bug#74112] Guix is not reproducible

[Ludovic Courtès]

Hi,

Maxim Cournoyer <maxim.cournoyer@gmail.com> skribis:

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

[...]

>> Maybe I am missing something.  To my knowledge, .go files produced by
>> Guile are not always reproducible, see bug#20272 [1].  And, from my
>> understanding, Guix cannot be reproducible until this bug had been
>> fixed.  Therefore, I am not convinced that this patch is worth under
>> this frame considering the build-time penalty it brings.
>>
>> That’s said, maybe it’s better than nothing and the package ’guix’ is
>> barely built after all.  I do not know.
>>
>> What people think?
>
> Perhaps we should set the default parallel-build? to #f in the
> guile-build-system at least in the meantime, with a prominent comment as
> to why and a reference to the upstream issue?  Many Guile packages use
> the gnu-build-system so that wouldn't cover all of them like
> 'guix'... I'm not sure.

Sounds good to me: packages using ‘guile-build-system’ are usually
relatively small so the impact is negligible.

‘guix’ is a little different because it takes so much time to build
sequentially…

Ludo’.