[bug#56618] [PATCH 0/2] Let 'guix gc -d' delete old Home generations

["Ludovic Courtès" <ludo@gnu.org>]

Hello,

Maxim Cournoyer <maxim.cournoyer@gmail.com> skribis:

> Ludovic Courtès <ludo@gnu.org> writes:

[...]

>> It’s an expected annoyance: to determine whether a graft needs to be
>> applied, we first need to download/build the ungrafted variant, which is
>> why you’re seeing this (this is worsened by the fact that many packages
>> are candidates for grafting currently on ‘master’).
>
> A perhaps naive idea: could we register GC roots for the ungrafted
> variant when grafted?  To avoid having to fetch it anew following 'guix
> gc' ?

And then we need code to remove those GC roots at some point, etc.  To
me that seems like a can of worms and lack of separation of concerns.

A related topic is GC.  If personally only ever use ‘guix gc -F25G’ or
similar; I almost never run ‘guix gc’ without arguments.  Perhaps we
should more clearly advocate that and/or have a Guix System service
enabled by default that does something along these lines.

Thoughts?

Ludo’.