From mboxrd@z Thu Jan  1 00:00:00 1970
From: Leo Famulari <leo@famulari.name>
Subject: Re: [PATCH] gnu: Add dlib.
Date: Thu, 18 Aug 2016 16:18:28 -0400
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To: Ben Woodcroft <b.woodcroft@uq.edu.au>
Cc: guix-devel <guix-devel@gnu.org>, Alex Kost <alezost@gmail.com>

On Wed, Aug 17, 2016 at 01:24:46PM +1000, Ben Woodcroft wrote:
> On 17/08/16 09:45, Leo Famulari wrote:
> > How did it appear non-deterministic to you?
> Just based on guix build --check:
> 
> guix build: error: build failed: derivation
> `/gnu/store/sxybcxw64q1ajzq6dysal75ffgq6238i-dlib-19.1.drv' may not be
> deterministic: output
> `/gnu/store/il57dcii4pzii11zlixjjxxxw699bg5x-dlib-19.1' differs
> 
> I'm actually not sure, why does it say "may not be deterministic"? If it
> builds twice and the second version is different, doesn't that mean it is
> definitely not deterministic by counter-example, unless there has been some
> leakage into the build container?

Ah yes, that checks if the built output is bit-for-bit identical. I
thought that you meant there was some non-determinism in the build
system, like a race condition caused by parallel building. Which could
also be true.