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+;; SPDX-FileCopyrightText: 2014-2022 Ludovic Courtès <ludo@gnu.org>
+;; SPDX-FileCopyrightText: 2015 Andy Wingo <wingo@igalia.com>
+;; SPDX-FileCopyrightText: 2015 Mark H Weaver <mhw@netris.org>
+;; SPDX-FileCopyrightText: 2016 Sou Bunnbu <iyzsong@gmail.com>
+;; SPDX-FileCopyrightText: 2017, 2020, 2022 Maxim Cournoyer <maxim.cournoyer@gmail.com>
+;; SPDX-FileCopyrightText: 2017 Nikita <nikita@n0.is>
+;; SPDX-FileCopyrightText: 2018, 2020 Efraim Flashner <efraim@flashner.co.il>
+;; SPDX-FileCopyrightText: 2018 Ricardo Wurmus <rekado@elephly.net>
+;; SPDX-FileCopyrightText: 2017, 2019 Christopher Baines <mail@cbaines.net>
+;; SPDX-FileCopyrightText: 2019 Tim Gesthuizen <tim.gesthuizen@yahoo.de>
+;; SPDX-FileCopyrightText: 2019 David Wilson <david@daviwil.com>
+;; SPDX-FileCopyrightText: 2020 Tobias Geerinckx-Rice <me@tobias.gr>
+;; SPDX-FileCopyrightText: 2020 Reza Alizadeh Majd <r.majd@pantherx.org>
+;; SPDX-FileCopyrightText: 2021 Brice Waegeneire <brice@waegenei.re>
+;; SPDX-FileCopyrightText: 2021, 2022 muradm <mail@muradm.net>
+;;
+;; SPDX-License-Identifier: GPL-3.0-or-later
+
+(define-module (rosenthal services desktop)
+  #:use-module (gnu packages admin)
+  #:use-module (gnu services)
+  #:use-module (gnu services shepherd)
+  #:use-module (gnu system pam)
+  #:use-module (gnu system shadow)
+  #:use-module (guix gexp)
+  #:use-module (guix records)
+  #:use-module (ice-9 match)
+  #:export (seatd-configuration
+            seatd-service-type))
+
+;;;
+;;; seatd-service-type -- minimal seat management daemon
+;;;
+
+(define (seatd-group-sanitizer group-or-name)
+  (match group-or-name
+    ((? user-group? group) group)
+    ((? string? group-name) (user-group (name group-name) (system? #t)))
+    (_ (leave (G_ "seatd: '~a' is not a valid group~%") group-or-name))))
+
+(define-record-type* <seatd-configuration> seatd-configuration
+  make-seatd-configuration
+  seatd-configuration?
+  (seatd seatd-package (default seatd))
+  (group seatd-group                    ; string | <user-group>
+         (default "seat")
+         (sanitize seatd-group-sanitizer))
+  (socket seatd-socket (default "/run/seatd.sock"))
+  (logfile seatd-logfile (default "/var/log/seatd.log"))
+  (loglevel seatd-loglevel (default "info")))
+
+(define (seatd-shepherd-service config)
+  (list (shepherd-service
+         (documentation "Minimal seat management daemon")
+         (requirement '())
+         (provision '(seatd))
+         (start #~(make-forkexec-constructor
+                   (list #$(file-append (seatd-package config) "/bin/seatd")
+                         "-g" #$(user-group-name (seatd-group config)))
+                   #:environment-variables
+                   (list (string-append "SEATD_LOGLEVEL="
+                                        #$(seatd-loglevel config))
+                         (string-append "SEATD_DEFAULTPATH="
+                                        #$(seatd-socket config)))
+                   #:log-file #$(seatd-logfile config)))
+         (stop #~(make-kill-destructor)))))
+
+(define seatd-accounts
+  (match-lambda (($ <seatd-configuration> _ group) (list group))))
+
+(define seatd-environment
+  (match-lambda
+    (($ <seatd-configuration> _ _ socket)
+     `(("SEATD_SOCK" . ,socket)))))
+
+(define seatd-service-type
+  (service-type
+   (name 'seatd)
+   (description "Seat management takes care of mediating access
+to shared devices (graphics, input), without requiring the
+applications needing access to be root.")
+   (extensions
+    (list
+     (service-extension account-service-type seatd-accounts)
+     (service-extension session-environment-service-type seatd-environment)
+     (service-extension shepherd-root-service-type seatd-shepherd-service)))
+   (default-value (seatd-configuration))))