bug#52786: [aarch64] elogind 246.10 fails to start on ROCK64, breaking sway

["pelzflorian (Florian Pelz)" <pelzflorian@pelzflorian.de>]

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On Tue, Dec 28, 2021 at 04:35:23PM +0100, pelzflorian (Florian Pelz) wrote:
> elogind commit 7db52c01ed07f543f8272ea9a726cb542e771595 is the first
> elogind version that does not launch, but it is too entangled to
> simply revert.  I will take another look tomorrow.

This was a dead end.  With 7db52c01ed07f543f8272ea9a726cb542e771595,
elogind did actually launch but shepherd did not recognize it.  The
attached patch was required, but it does not make a difference for
starting sway.  (Neither is it an alternative fix for
<https://issues.guix.gnu.org/issue/52051>.)

Elogind’s entire v246-stable branch does not run sway anymore on
ROCK64.  I don’t think bisecting is a good way to find the cause.

The sway errors are:

00:00:00.013 [ERROR] [wlr] [libseat] [libseat/backend/seatd.c:78] Could not connect to socket /run/seatd.sock: No such file or directory
00:00:00.031 [ERROR] [wlr] [libseat] [libseat/backend/logind.c:267] Could not activate session: Action org.freedesktop.login1.chvt is not registered
00:00:00.031 [ERROR] [wlr] [libseat] [libseat/libseat.c:73] No backend was able to open a seat
00:00:00.031 [ERROR] [wlr] [backend/session/session.c:84] Unable to create seat: Function not implemented
00:00:00.031 [ERROR] [wlr] [backend/session/session.c:218] Failed to load session backend
00:00:00.031 [ERROR] [wlr] [backend/backend.c:353] Failed to start a DRM session
00:00:00.031 [ERROR] [sway/server.c:53] Unable to create backend

The first line seems harmless and is also printed on old elogind
before sway starts.

I will try to actually understand what is happening.

Regards,
Florian

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From: Florian Pelz <pelzflorian@pelzflorian.de>
Date: Sat, 1 Jan 2022 12:17:14 +0100
Subject: [PATCH] TEST elogind: Watch PID file.

* gnu/services/desktop.scm (elogind-shepherd-service): Set #:pid-file.
---
 gnu/services/desktop.scm | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/gnu/services/desktop.scm b/gnu/services/desktop.scm
index c6761ca784..fc5617c046 100644
--- a/gnu/services/desktop.scm
+++ b/gnu/services/desktop.scm
@@ -13,6 +13,7 @@
 ;;; Copyright © 2020 Tobias Geerinckx-Rice <me@tobias.gr>
 ;;; Copyright © 2020 Reza Alizadeh Majd <r.majd@pantherx.org>
 ;;; Copyright © 2021 Brice Waegeneire <brice@waegenei.re>
+;;; Copyright © 2022 Florian Pelz <pelzflorian@pelzflorian.de>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -731,7 +732,9 @@ (define (elogind-shepherd-service config)
                    #:environment-variables
                    (list (string-append "ELOGIND_CONF_FILE="
                                         #$(elogind-configuration-file
-                                           config)))))
+                                           config)))
+                   ;; The PID path from elogind's package definition:
+                   #:pid-file "/run/systemd/elogind.pid"))
          (stop #~(make-kill-destructor)))))
 
 (define elogind-service-type

base-commit: 87624540b486d710749ad00ef5aa427a9e5c1d0c
-- 
2.34.0