[bug#41863] [PATCH] services: Fix gdm-autologin pam service.

[Alex Griffin via Guix-patches via <guix-patches@gnu.org>]

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This patch fixes GDM's auto-login feature.

See the discussions in #35674 and #40411. It works for me, but I don't want to just commit it because I don't really understand PAM. (Then again, who does?)

--
Alex Griffin

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From 2d07fab70a4051189e013a20a95cfbb08c904803 Mon Sep 17 00:00:00 2001
From: Alex Griffin <a@ajgrf.com>
Date: Sun, 14 Jun 2020 17:58:47 -0500
Subject: [PATCH] services: Fix gdm-autologin pam service.

* gnu/services/xorg.scm (gdm-pam-service): Mark pam_gdm.so optional.
---
 gnu/services/xorg.scm | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gnu/services/xorg.scm b/gnu/services/xorg.scm
index ca39994516..4590709187 100644
--- a/gnu/services/xorg.scm
+++ b/gnu/services/xorg.scm
@@ -7,6 +7,7 @@
 ;;; Copyright © 2019 Tim Gesthuizen <tim.gesthuizen@yahoo.de>
 ;;; Copyright © 2020 shtwzrd <shtwzrd@protonmail.com>
 ;;; Copyright © 2020 Jakub Kądziołka <kuba@kadziolka.net>
+;;; Copyright © 2020 Alex Griffin <a@ajgrf.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -925,7 +926,7 @@ the GNOME desktop environment.")
     (inherit (unix-pam-service "gdm-autologin"
                                #:login-uid? #t))
     (auth (list (pam-entry
-                 (control "[success=ok default=1]")
+                 (control "optional")
                  (module (file-append (gdm-configuration-gdm config)
                                       "/lib/security/pam_gdm.so")))
                 (pam-entry
-- 
2.26.2