Re: F38 proposal: Reproducible builds: Clamp build mtimes to $SOURCE_DATE_EPOCH (System-Wide Change proposal)

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* Alexander Sosedkin:

> On Fri, Nov 11, 2022 at 11:53 AM Petr Pisar <ppisar@xxxxxxxxxx> wrote:
>> An RPM package itself carry a build time in its RPM header.
>> Are we also going to fake this time in the name of
>> reproducibility?
>
> My opinion: yes, please do (%use_source_date_epoch_as_buildtime).
> And fake the builder hostname (%_buildhost).
> And enable back --enable-deterministic-archives in binutils:
> (https://bugzilla.redhat.com/show_bug.cgi?id=1195883).
> And do whatever else is necessary to stop shipping binary packages
> that users can't reproduce bit-to-bit.

The downside of doing this is that it's no longer possible to check
whether a build happened against a buildroot with a particular fix in
it.  The time-based check was never 100% reliable, but it could be used
as a good indicator in the past.

Thanks,
Florian
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