[bug#74112] [PATCH] Fix determinism issue in guix package

[Jakob Kirsch via Guix-patches via <guix-patches@gnu.org>]

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I've recently noticed that `guix challenge guix` returns different hashes for each substitute server and also every build with `guix build --no-grafts guix` fails.
Running `guix build --no-grafts guix --cores=1` seems to reliably produce the same hash though. As someone pointed out on XMPP, Guile seems to have issues with parallel builds so this patch disables them for the guix package.

I think this has high importance because the main guix package should be reproducible in order to trust the whole chain of packages.

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From 0f3df56dd0c430c09ba2839c9e2d5b32948201ae Mon Sep 17 00:00:00 2001
Message-ID: <0f3df56dd0c430c09ba2839c9e2d5b32948201ae.1730311414.git.jakob.kirsch@web.de>
From: Jakob Kirsch <jakob.kirsch@web.de>
Date: Wed, 30 Oct 2024 19:02:15 +0100
Subject: [PATCH v1] gnu: guix: Fix determinism issue

* gnu/packages/package-management.scm (guix): Fix determinism issue by disabling parallel build.

Change-Id: Ie28e16ed1f15cbc0da0c0d70b2c461e2baa3ff0a
---
 gnu/packages/package-management.scm | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gnu/packages/package-management.scm b/gnu/packages/package-management.scm
index 1763d2d59f..478a74385b 100644
--- a/gnu/packages/package-management.scm
+++ b/gnu/packages/package-management.scm
@@ -199,7 +199,8 @@ (define-public guix
                 (file-name (string-append "guix-" version "-checkout"))))
       (build-system gnu-build-system)
       (arguments
-       `(#:configure-flags (list
+       `(#:parallel-build? #false ; for reproducibility
+         #:configure-flags (list

                             ;; Provide channel metadata for 'guix describe'.
                             ;; Don't pass '--with-channel-url' and

base-commit: d6f775c30c6f47e174f6110d1089edc6315600e4
--
2.46.0