[bug#64861] [PATCH] guix: Add lint check for guix as propagated-input

[Christopher Baines]

Karl Hallsby <karl@hallsby.com> writes:

> * guix/lint.scm (new check): Run lint check warning user if the provided
> package uses guix as a propagated-input.
>
> Passing guix as a propagated-input is problematic when users install a package
> into their profiles. This can cause the guix propagated by the package to be
> used in preference of the real one in $HOME/.config/. It was first noticed on
> IRC with https://logs.guix.gnu.org/guix/2023-07-22.log#044534, and reproduced
> with a different package https://logs.guix.gnu.org/guix/2023-07-25.log#054737.
> ---
>  guix/lint.scm | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)

I'm not sure this lint warning is helpful as in both cases mentioned in
the IRC links you provided (guile-imanifest and guix-data-service),
these packages provide Guile modules that depend on Guix, and therefore
the guix package is expected in their propagated inputs.

If you remove guix or make it a input instead of a propagated input,
then this breaks using the package, for example, with this change:

  modified   gnu/packages/guile-xyz.scm
  @@ -2098,8 +2098,10 @@ (define-public guile-imanifest
         (build-system guile-build-system)
         (native-inputs
          (list guile-3.0))
  +      (inputs
  +       (list guix))
         (propagated-inputs
  -       (list guile-readline guile-colorized guix))
  +       (list guile-readline guile-colorized))
         (home-page "https://sr.ht/~brown121407/guile-imanifest";)
         (synopsis "Interactive Guix manifests")
         (description "This package provides functions to generate Guix 
manifests

Using guile-imanifest breaks:

  → ./pre-inst-env guix environment --pure --ad-hoc guile guile-imanifest -- 
guile -c "(use-modules (imanifest))"
  Backtrace:
    ...

  ice-9/boot-9.scm:3330:6: In procedure resolve-interface:
  no code for module (guix profiles)


I think some other approach is needed to avoid people having problems
with the guix package appearing in their users profile.

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