bug#73613: texlive-luatex is not reproducible

[Maxim Cournoyer <maxim.cournoyer@gmail.com>]

Hi Nicolas,

Nicolas Goaziou <mail@nicolasgoaziou.fr> writes:

> Hello,
>
> Maxim Cournoyer <maxim.cournoyer@gmail.com> writes:
>
>> This was discovered building texlive-luatex twice (--rounds=2 -K);
>> diffoscope shows that:
>>
>
> [...]
>
>> These are apparently time stamps as well as UUIDs.  Debian [0, 1] and
>> NixOS [1] have patched some of them using faketime and substitute [0].
>>
>> We should follow suite.
>>
>> [0]  https://salsa.debian.org/live-team/live-build/-/blob/master/examples/hooks/reproducible/2006-reproducible-texlive-binaries-fmt-files.hook.chroot
>> [1]  https://github.com/NixOS/nixpkgs/pull/227873
>
> This is difficult to follow, because Debian and NixOS do not seem to
> apply the same fixes. For example, the former wraps "faketime" around
> "tex -ini tex.ini" call whereas the latter wraps it around
> "fmtutil-sys --all" call.
>
> By the way, how do you call "faketime" from (guix build-system texlive)?
> It is not possible to use (gnu packages check) module from there, isn't
> it?

You'd have to add it to the implicit inputs defined for the build
system.

> Note that Guix never runs "mtxrun --generate", so I don't think UUIDs
> are a problem in our case.

OK.  I'm afraid don't have more insights than what I had shared already
:-).

-- 
Thanks,
Maxim