From mboxrd@z Thu Jan  1 00:00:00 1970
From: Federico Beffa <beffa@ieee.org>
Subject: Re: [PATCH] profiles: Generate GHC's package database cache.
Date: Sun, 5 Apr 2015 22:27:43 +0200
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To: =?UTF-8?Q?Ludovic_Court=C3=A8s?= <ludo@gnu.org>
Cc: Guix-devel <guix-devel@gnu.org>

ludo@gnu.org (Ludovic Court=C3=A8s) writes:

> Eventually we could think of more sophisticated way to determine whether
> to trigger a given =E2=80=9Chook=E2=80=9D (info-dir, ca-certificates, ghc=
.)  Perhaps
> this =E2=80=98ghc-package-cache-file=E2=80=99 procedure could be added as=
 an
> =E2=80=98environment-hook=E2=80=99 field of the ghc package and it would =
be triggered
> iff GHC is installed.  (This approach would work well for GHC, but not
> for info-dir or ca-certificates, though.)

On top of the mentioned cases above, there are many programs making use
of caches. Some are:

* GLib's IO modules normally use a cache file 'giomodule.cache'. We set
  the env. var. GIO_EXTRA_MODULES, but it's use is explicitly
  discouraged by the project.

* XDG icons 'icon-theme.cache': I see some clashes in my profile (e.g.,
  gtk and Inkscape).

* TeX 'ls-R' files: it would probably simplify modularization.

* I see python's easy_install site.py clashes in my profile.  These are
  probably harmless, but annoying.

It would definitely be good to establish a solid and general way to run
"hooks" to address this kind of situations.

Regards,
Fede