From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Subject: bug#30435: libreoffice: Fonts don't show up after install
Date: Thu, 02 Apr 2020 17:46:00 +0200
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References: <bad1fc034ed4a0a4dbf14f74d431b7ae@posteo.de>
 <87a73ui78x.fsf@ambrevar.xyz>
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In-Reply-To: <87a73ui78x.fsf@ambrevar.xyz> (Pierre Neidhardt's message of
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To: Pierre Neidhardt <mail@ambrevar.xyz>
Cc: 30435@debbugs.gnu.org, guix-devel@gnu.org, hmk <hmk42@posteo.de>

Hi,

Pierre Neidhardt <mail@ambrevar.xyz> skribis:

> Running
>
> fc-cache -fv
>
> fixes the issue.
>
> Should we run this command in a profile hook?

Profile hooks are normal derivations; as such, they don=E2=80=99t have acce=
ss to
anything but their dependencies and their output(s).

There=E2=80=99s currently no infrastructure to run arbitrary code upon pack=
age
installation (which I think is a feature more than a bug :-)).  We could
make an exception, but it=E2=80=99s kinda ugly.

I wonder if, instead, we could have Fontconfig realize that the cache is
stale somehow.

Alternately, we could generate the cache in a profile hook and have
Fontconfig use that cache instead of the one in ~/.cache.  However,
Fontconfig would need to be able to:

  1. Be told which cache to use, not just the one from ~/.guix-profile,
     so that it works equally well with other profiles.

  2. Merge several caches, so it can also account for fonts installed in
     /run/current-system/profile.

We discussed all this several times in the past but I don=E2=80=99t think it
went further.

Ludo=E2=80=99.