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Re: reproducibility
From: |
Ludovic Courtès |
Subject: |
Re: reproducibility |
Date: |
Tue, 12 Jan 2016 22:37:46 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux) |
Federico Beffa <address@hidden> skribis:
> On Sun, Jan 10, 2016 at 9:49 PM, Ludovic Courtès <address@hidden> wrote:
>> Federico Beffa <address@hidden> skribis:
>>
>>> I've noticed that a derivation is a function of the order of the
>>> inputs. As an example, the following two input orders give rise to two
>>> distinct derivations:
>>>
>>> A)
>>>
>>> (inputs
>>> `(("texlive" ,texlive)
>>> ("texinfo" ,texinfo)
>>> ("m4" ,m4)
>>> ("libx11" ,libx11))
>>>
>>> B)
>>> (inputs
>>> `(("texinfo" ,texinfo)
>>> ("texlive" ,texlive)
>>> ("m4" ,m4)
>>> ("libx11" ,libx11))
>>>
>>> Is this intentional?
>>
>> Yes. There are several places where order matters, most importantly
>> search paths, and these are computed from the input lists.
>
> If order matters, it would probably be more robust to force internally
> a specific order rather than relying on the (often random) order
> defined in a package recipe (possibly created by an importer, ...).
Most of the time any order would work, but I can imagine situations
where the packager could purposefully choose a specific order. So I’d
rather not do any automatic sorting, if that’s what you have in mind.
Thanks,
Ludo’.