GNU bug report logs - #42025
Determinism Problem with Mpv

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Msavoritias <marinus.savoritias <at> disroot.org>
To: bug-guix <at> gnu.org
Subject: Determinism Problem with Mpv
Date: Tue, 23 Jun 2020 19:41:56 +0200

[Message part 1 (text/plain, inline)]

Hi,

I was updating Guix today with the option rounds=2 and I hit an error 
with mpv having different outputs everytime it was built.

The message is this:
building /gnu/store/qkmylc2cd950kf4zk8y3ay0hpwcvjpvr-mpv-0.32.0.drv...
\output ‘/gnu/store/q71zaxglbwmw3z4r1a3jmf1mgwrpmv4c-mpv-0.32.0’ of 
‘/gnu/store/qkmylc2cd950kf4zk8y3ay0hpwcvjpvr-mpv-0.32.0.drv’ 
differs from previous round
build of /gnu/store/qkmylc2cd950kf4zk8y3ay0hpwcvjpvr-mpv-0.32.0.drv 
failed
View build log at 
'/var/log/guix/drvs/qk/mylc2cd950kf4zk8y3ay0hpwcvjpvr-mpv-0.32.0.drv.bz2'.
cannot build derivation 
`/gnu/store/3j9pkj5kad042i1zyqzdw2vl1yfsbznk-celluloid-0.19.drv': 1 
dependencies couldn't be built
guix upgrade: error: build of 
`/gnu/store/3j9pkj5kad042i1zyqzdw2vl1yfsbznk-celluloid-0.19.drv' failed

And my system is this:
Generation 9	Jun 23 2020 19:41:06	(current)
 guix aa246ea
   repository URL: <https://git.savannah.gnu.org/git/guix.git>
   branch: master
   commit: aa246eaa6b338fc6509bd5e6b93fa23121b2c95c

Let me know if there is more information I can provide.

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Message #10 received at 42025-done <at> debbugs.gnu.org (full text, mbox):

From: Marius Bakke <marius <at> gnu.org>
To: Msavoritias <marinus.savoritias <at> disroot.org>, 42025-done <at> debbugs.gnu.org
Subject: Re: bug#42025: Determinism Problem with Mpv
Date: Tue, 23 Jun 2020 22:27:39 +0200

[Message part 1 (text/plain, inline)]

Msavoritias <marinus.savoritias <at> disroot.org> writes:

> Hi,
>
> I was updating Guix today with the option rounds=2 and I hit an error 
> with mpv having different outputs everytime it was built.

Fixed in a864d407119980ef5cfd4be079b8ec2b8038102b, thanks!

[signature.asc (application/pgp-signature, inline)]

Message #13 received at 42025 <at> debbugs.gnu.org (full text, mbox):

From: Ricardo Wurmus <rekado <at> elephly.net>
To: Msavoritias <marinus.savoritias <at> disroot.org>
Cc: 42025 <at> debbugs.gnu.org
Subject: Re: bug#42025: Determinism Problem with Mpv
Date: Tue, 23 Jun 2020 23:29:49 +0200

Thank you for the report.

> The message is this:
> building /gnu/store/qkmylc2cd950kf4zk8y3ay0hpwcvjpvr-mpv-0.32.0.drv...
> \output ‘/gnu/store/q71zaxglbwmw3z4r1a3jmf1mgwrpmv4c-mpv-0.32.0’ of
> ‘/gnu/store/qkmylc2cd950kf4zk8y3ay0hpwcvjpvr-mpv-0.32.0.drv’ differs
> from previous round

[…]

> Let me know if there is more information I can provide.

Can you please tell us what files differ when you build mpv a second
time with “guix build --check -K --no-grafts mpv” and compare the two
output directories?  Perhaps there are obvious patterns that could give
us a clue as to what causes the differences.

-- 
Ricardo

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