(+Cc: Efraim following our discussion on IRC.)

Ludovic Courtès <ludo@gnu.org> skribis:

> This is a bug where the presence of propagated inputs leads ‘guix
> upgrade’ to assume something would be upgraded, even when that’s not the
> case.  This can be reproduced with:
>
>   guix install -p foo guile
>   guix upgrade -p foo

I came up with an actual fix for that (attached), nice and clean, which
would allow ‘guix upgrade’ to correctly determine whether something is
going to be upgraded.

But then I realized that this cannot work in the presence of grafts:
first because ‘-n’ currently implies ‘--no-grafts’, so this is an apple
to orange comparison, and then because computing the output file name of
a grafted package can require building the package (grafts are “dynamic
dependencies”.)

So I’m willing to punt for now.

I wonder if there’s a UI trick we could use to avoid displaying too many
“(dependencies changed)” though.

Thoughts?

Ludo’.