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bug#33124: Cuirass: register GC roots for evaluations under /var/guix/gc

From: Ludovic Courtès
Subject: bug#33124: Cuirass: register GC roots for evaluations under /var/guix/gcroots
Date: Wed, 07 Nov 2018 15:29:38 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux)

Hi Clément,

Clément Lassieur <address@hidden> skribis:

> I think the goal here is to make sure that the builds that resulted from
> of 1) important evaluations (releases) and 2) recent evaluations aren't
> garbage collected.
> <sneek> snape, civodul says: i think Cuirass should register GC roots for its
>       evaluations under /var/guix/gcroots
> <snape> [...] How many such evaluations should be registered?  If all
>       are registered, we'll run out of space won't we?  So would it be
>       like the last 15 or something?
> <civodul> snape: i think we'd register all of them and use (guix cache) to
>         automatically wipe old ones periodically  [09:53]
> <civodul> snape: when there's a release we could manually stash important
>         evaluations away so they won't be deleted
> <civodul> so i'd just create one subdir for each eval say in
>         /var/guix/profiles/USER/cuirass/evaluations  [09:54]
> <civodul> and that'd contain a bunch of symlinks to both the .drv and the
>         outputs

I went ahead and implemented a simple version of this in commit

Let me know what you think!


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