GNU bug report logs - #42009
package cache build is not deterministic

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From: Ludovic Courtès <ludo <at> gnu.org>
To: zimoun <zimon.toutoune <at> gmail.com>
Cc: 42009 <at> debbugs.gnu.org, Tobias Geerinckx-Rice <me <at> tobias.gr>, Marinus <marinus.savoritias <at> disroot.org>
Subject: bug#42009: package.cache not deterministic
Date: Sun, 28 Jun 2020 22:29:49 +0200

Hi,

Most likely the problem with non-reproducible .go files is that the fix
for <https://bugs.gnu.org/20272> was incomplete.  In particular, I think
that gensyms are not reproducible when building things in parallel,
because the gensym depends on what’s loaded vs. interpreted.

Example of a simpler discrepancy:

--8<---------------cut here---------------start------------->8---
$ guix challenge guile-gcrypt
/gnu/store/i6zzgsjjlqyfn9zmanb55hqdackhc0mf-guile-gcrypt-0.3.0 contents differ:
  local hash: 0bkxim5532bd234iqxvxd31ybp6v7rmbrvyj3jrgpmgxbsw7hmxj
  https://ci.guix.gnu.org/nar/lzip/i6zzgsjjlqyfn9zmanb55hqdackhc0mf-guile-gcrypt-0.3.0: 00zsccxn1485bnvxvssgq50i2w69i38m9hnrk8z1sji9qcmmaxcs
  differing files:
    /lib/guile/3.0/site-ccache/gcrypt/pk-crypto.go
    /lib/guile/3.0/site-ccache/gcrypt/mac.go
--8<---------------cut here---------------end--------------->8---

HTH!

Ludo’.

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