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bug#39771: [core-updates] 'guix pull' and './pre-inst-env' produces diff

From: Marius Bakke
Subject: bug#39771: [core-updates] 'guix pull' and './pre-inst-env' produces different derivations
Date: Mon, 02 Mar 2020 21:23:32 +0100
User-agent: Notmuch/0.29.3 (https://notmuchmail.org) Emacs/26.3 (x86_64-pc-linux-gnu)

Marius Bakke <address@hidden> writes:

> Marius Bakke <address@hidden> writes:
>> Hello,
>> There is a strange bug on the core-updates branch: if you 'guix pull
>> --branch=core-updates', everything from around 'guile-bootstrap@2.0' in
>> the package graph will have different derivations from what you get in
>> the git checkout:
>> On my local fork of core-updates:
>> ./pre-inst-env guix build -d bash
>> /gnu/store/y834q3sf056hkglpli4gr3ijmpvgzb7c-bash-5.0.16.drv
>> After 'guix pull -p /tmp/core-updates --url=/my/checkout
>> --branch=core-updates', on the same commit:
>> /tmp/core-updates/bin/guix build -d bash
>> /gnu/store/m3q1w669f7br5cs4admdy5p8rijrjmvp-bash-5.0.16.drv
> I've tracked this down to 'gash-boot'.  Namely the use of ,(version): it
> evaluates to '2.2.6' when run with ./pre-inst-env and "3.0.0" after
> 'guix pull'.
> I suspect both are wrong, and that it really intends to use the version
> of gash here.  Timothy, can you confirm?
> Currently trying to 'guix pull' with a hard coded "2.2.6" version to
> see if other instances need changing.

This patch solves the problem without triggering a full rebuild:

diff --git a/gnu/packages/commencement.scm b/gnu/packages/commencement.scm
index cfbb5e3bff..0d5bfa4dfa 100644
--- a/gnu/packages/commencement.scm
+++ b/gnu/packages/commencement.scm
@@ -151,7 +151,7 @@ pure Scheme to Tar and decompression in one easy step.")
          (use-modules (guix build gnu-bootstrap))
          (modify-phases %standard-phases
            (replace 'configure
-             (bootstrap-configure ,(version) "gash" "scripts"))
+             (bootstrap-configure "2.2.6" "gash" "scripts"))
            (replace 'build (bootstrap-build "gash"))
            (replace 'install (bootstrap-install "gash" "scripts"))
            (add-after 'install 'install-symlinks
@@ -214,7 +214,7 @@ pure Scheme to Tar and decompression in one easy step.")
                (delete-file "scripts/template.in")
            (replace 'configure
-             (bootstrap-configure ,(version) "gash" "scripts"))
+             (bootstrap-configure "2.2.6" "gash" "scripts"))
            (replace 'build (bootstrap-build "gash"))
            (replace 'install (bootstrap-install "gash" "scripts"))
            ;; XXX: The scripts should add Gash to their load paths and
I have another full-rebuild commit in the pipeline (bzip2 currently
keeps a reference to the Mes toolchain), so we might as well fix it

Waiting for confirmation from Timothy as to what the proper fix is,

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