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Re: more package transformations: overrides

From: Ludovic Courtès
Subject: Re: more package transformations: overrides
Date: Wed, 22 Mar 2023 15:38:03 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.2 (gnu/linux)


Ricardo Wurmus <> skribis:

> when using package transformations the command line can become crowded
> very quickly.  Sometimes I would like to be able to provide a file
> containing a set of alternative packages that are used recursively in
> the package dependency graph, as some sort of override.

The long-command-line issue can be addressed by using a manifest,
possibly generated (info "(guix) Writing Manifests").

> What do you think about extending package transformations to allow for
> reading override packages from a file?  The replacements would happen by
> matching package names, so a package named “python-pytorch” in my
> overrides file would replace the original “python-pytorch” package in
> the input graph.  All these packages would be applied as overrides
> together.

Could this override mechanism be itself a package transformation option?

  guix shell python-pytorch \

Perhaps ‘--with-overrides’ without any argument would pick a default
file name.

It would be implemented in terms of ‘package-input-rewriting/spec’ I


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