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Customizing /etc

From: Ludovic Courtès
Subject: Customizing /etc
Date: Mon, 19 Sep 2016 23:08:43 +0900
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux)

Alex Kost <address@hidden> skribis:

> Ludovic Courtès (2016-09-14 16:58 +0200) wrote:
>> Hello,
>> address@hidden (Carlos Sánchez de La Lama) skribis:
>>> I have an interesting case here. I have guile installed in my system
>>> profile, so that
>>> /var/guix/profiles/system/profile/share/aclocal/guile.m4
>>> is there. However, autoconf is installed in my *user* profile, so
>>> ACLOCAL_PATH is augmented in ~/.guix-profile/etc/profile to include
>>> ~/.guix-profile/share/aclocal
>>> But not the system-profile aclocal directory, which would be put into
>>> ACLOCAL_PATH by /var/guix/profiles/system/profile/etc/profile if
>>> autoconf was installed in the systme profile as well.
>>> Is this the intended behaviour? I am wondering whether packages with
>>> search paths should include both the user-profile directories and the
>>> system-profile ones.
>> I think you’re right.  This was discussed at
>> <>, leading to a patch (for GuixSD).
>> However, we failed to build consensus around the approach of this patch,
>> so we did not apply it.  If you have ideas, please email
>> address@hidden  :-)
> I think I was the one who prevents the consensus.  To make it clear, I'm
> for the suggested solution, but only *after* giving a user a freedom to
> avoid loading such a heavy command as "guix package --search-paths".  On
> a "usual" GNU/Linux distro a user can edit /etc/profile, but on GuixSD
> it is not possible currently.  That's why I think there should be
> provided a possibility to override /etc/profile at first.

Indeed, thanks for the reminder!

In fact, we have this through ‘etc-service-type’, except that currently
/etc/profile is systematically added.

So an idea that comes to mind is to allow ‘etc-service-type’ to be
extended with procedures that would be able to filter or otherwise
change the /etc entries (similar to what we do for PAM):

diff --git a/gnu/services.scm b/gnu/services.scm
index 7e322c5..9397232 100644
--- a/gnu/services.scm
+++ b/gnu/services.scm
@@ -426,9 +426,13 @@ directory."
                   (service-extension activation-service-type
-                                     (lambda (files)
-                                       (let ((etc
-                                              (files->etc-directory files)))
+                                     (lambda (files+procs)
+                                       (let* ((proc (apply compose
+                                                           (filter procedure?
+                                              (files (filter pair? 
+                                              (etc
+                                               (files->etc-directory (proc 
                                          #~(activate-etc #$etc))))
                   (service-extension system-service-type etc-entry)))
                 (compose concatenate)
In your config, you could have something like:

  (services (cons (simple-service 'rm-/etc/profile etc-service-type
                                  (const (lambda (files)
                                           (assoc-delete "profile" files))))


In fact I think we would need to have a more generic mechanism to hook
into ‘fold-services’, but I’m not sure what it should look like.


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