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

[Marius Bakke]

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 believe this is a recent regression (probably the wip-bootstrap
changes?), as I've pulled (and reconfigured) on the branch before.

Any idea what is going on here?

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