688 lines
26 KiB
Scheme
688 lines
26 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2019, 2020 L p R n d n <guix@lprndn.info>
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;;; Copyright © 2020 Ricardo Wurmus <rekado@elephly.net>
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;;; Copyright © 2022 Maxim Cournoyer <maxim.cournoyer@gmail.com>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gnu services lightdm)
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#:use-module (gnu artwork)
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#:use-module (gnu packages admin)
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#:use-module (gnu packages display-managers)
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#:use-module (gnu packages freedesktop)
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#:use-module (gnu packages gnome)
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#:use-module (gnu packages vnc)
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#:use-module (gnu packages xorg)
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#:use-module (gnu services configuration)
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#:use-module (gnu services dbus)
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#:use-module (gnu services desktop)
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#:use-module (gnu services shepherd)
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#:use-module (gnu services xorg)
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#:use-module (gnu services)
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#:use-module (gnu system pam)
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#:use-module (gnu system shadow)
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#:use-module (guix diagnostics)
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#:use-module (guix gexp)
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#:use-module (guix i18n)
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#:use-module (guix records)
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#:use-module (ice-9 format)
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#:use-module (ice-9 match)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-26)
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#:export (lightdm-seat-configuration
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lightdm-seat-configuration?
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lightdm-seat-configuration-name
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lightdm-seat-configuration-type
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lightdm-seat-configuration-user-session
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lightdm-seat-configuration-autologin-user
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lightdm-seat-configuration-greeter-session
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lightdm-seat-configuration-xserver-command
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lightdm-seat-configuration-session-wrapper
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lightdm-seat-configuration-extra-config
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lightdm-gtk-greeter-configuration
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lightdm-gtk-greeter-configuration?
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lightdm-gtk-greeter-configuration-lightdm-gtk-greeter
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lightdm-gtk-greeter-configuration-assets
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lightdm-gtk-greeter-configuration-theme-name
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lightdm-gtk-greeter-configuration-icon-theme-name
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lightdm-gtk-greeter-configuration-cursor-theme-name
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lightdm-gtk-greeter-configuration-allow-debug
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lightdm-gtk-greeter-configuration-background
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lightdm-gtk-greeter-configuration-a11y-states
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lightdm-gtk-greeter-configuration-reader
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lightdm-gtk-greeter-configuration-extra-config
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lightdm-configuration
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lightdm-configuration?
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lightdm-configuration-lightdm
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lightdm-configuration-allow-empty-passwords?
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lightdm-configuration-xorg-configuration
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lightdm-configuration-greeters
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lightdm-configuration-seats
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lightdm-configuration-xdmcp?
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lightdm-configuration-xdmcp-listen-address
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lightdm-configuration-vnc-server?
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lightdm-configuration-vnc-server-command
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lightdm-configuration-vnc-server-listen-address
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lightdm-configuration-vnc-server-port
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lightdm-configuration-extra-config
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lightdm-service-type))
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;;;
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;;; Greeters.
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;;;
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(define list-of-file-likes?
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(list-of file-like?))
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(define %a11y-states '(contrast font keyboard reader))
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(define (a11y-state? value)
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(memq value %a11y-states))
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(define list-of-a11y-states?
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(list-of a11y-state?))
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(define-maybe boolean)
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(define (serialize-boolean name value)
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(define (strip-trailing-? name)
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;; field? -> field
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(let ((str (symbol->string name)))
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(if (string-suffix? "?" str)
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(string-drop-right str 1)
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str)))
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(format #f "~a=~:[false~;true~]~%" (strip-trailing-? name) value))
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(define-maybe file-like)
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(define (serialize-file-like name value)
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#~(format #f "~a=~a~%" '#$name #$value))
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(define (serialize-list-of-a11y-states name value)
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(format #f "~a=~a~%" name (string-join (map symbol->string value) ";")))
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(define (serialize-string name value)
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(format #f "~a=~a~%" name value))
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(define (serialize-number name value)
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(format #f "~a=~a~%" name value))
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(define (serialize-list-of-strings _ value)
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(string-join value "\n"))
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(define-configuration lightdm-gtk-greeter-configuration
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(lightdm-gtk-greeter
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(file-like lightdm-gtk-greeter)
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"The lightdm-gtk-greeter package to use."
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empty-serializer)
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(assets
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(list-of-file-likes (list adwaita-icon-theme
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gnome-themes-extra
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;; FIXME: hicolor-icon-theme should be in the
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;; packages of the desktop templates.
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hicolor-icon-theme))
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"The list of packages complementing the greeter, such as package providing
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icon themes."
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empty-serializer)
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(theme-name
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(string "Adwaita")
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"The name of the theme to use.")
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(icon-theme-name
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(string "Adwaita")
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"The name of the icon theme to use.")
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(cursor-theme-name
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(string "Adwaita")
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"The name of the cursor theme to use.")
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(cursor-theme-size
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(number 16)
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"The size to use for the the cursor theme.")
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(allow-debugging?
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maybe-boolean
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"Set to #t to enable debug log level.")
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(background
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(file-like (file-append %artwork-repository
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"/backgrounds/guix-checkered-16-9.svg"))
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"The background image to use.")
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;; FIXME: This should be enabled by default, but it currently doesn't work,
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;; failing to connect to D-Bus, causing the login to fail.
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(at-spi-enabled?
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(boolean #f)
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"Enable accessibility support through the Assistive Technology Service
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Provider Interface (AT-SPI).")
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(a11y-states
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(list-of-a11y-states %a11y-states)
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"The accessibility features to enable, given as list of symbols.")
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(reader
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maybe-file-like
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"The command to use to launch a screen reader.")
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(extra-config
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(list-of-strings '())
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"Extra configuration values to append to the LightDM GTK Greeter
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configuration file."))
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(define (strip-record-type-name-brackets name)
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"Remove the '<' and '>' brackets from NAME, a symbol."
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(let ((name (symbol->string name)))
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(if (and (string-prefix? "<" name)
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(string-suffix? ">" name))
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(string->symbol (string-drop (string-drop-right name 1) 1))
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(error "unexpected record type name" name))))
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(define (config->name config)
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"Return the constructor name (a symbol) from CONFIG."
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(strip-record-type-name-brackets
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(record-type-name (struct-vtable config))))
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(define (greeter-configuration->greeter-fields config)
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"Return the fields of CONFIG, a greeter configuration."
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(match config
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;; Note: register any new greeter configuration here.
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((? lightdm-gtk-greeter-configuration?)
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lightdm-gtk-greeter-configuration-fields)))
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(define (greeter-configuration->packages config)
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"Return the list of greeter packages, including assets, used by CONFIG, a
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greeter configuration."
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(match config
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;; Note: register any new greeter configuration here.
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((? lightdm-gtk-greeter-configuration?)
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(cons (lightdm-gtk-greeter-configuration-lightdm-gtk-greeter config)
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(lightdm-gtk-greeter-configuration-assets config)))))
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;;; TODO: Implement directly in (gnu services configuration), perhaps by
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;;; making the FIELDS argument optional.
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(define (serialize-configuration* config)
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"Like `serialize-configuration', but not requiring to provide a FIELDS
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argument."
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(define fields (greeter-configuration->greeter-fields config))
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(serialize-configuration config fields))
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(define (greeter-configuration->conf-name config)
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"Return the file name of CONFIG, a greeter configuration."
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(format #f "~a.conf" (greeter-configuration->greeter-session config)))
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(define (greeter-configuration->file config)
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"Serialize CONFIG into a file under the output directory, so that it can be
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easily added to XDG_CONF_DIRS."
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(computed-file
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(greeter-configuration->conf-name config)
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#~(begin
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(call-with-output-file #$output
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(lambda (port)
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(format port (string-append
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"[greeter]\n"
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#$(serialize-configuration* config))))))))
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;;;
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;;; Seats.
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;;;
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(define seat-name? string?)
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(define (serialize-seat-name _ value)
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(format #f "[Seat:~a]~%" value))
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(define (seat-type? type)
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(memq type '(local xremote)))
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(define (serialize-seat-type name value)
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(format #f "~a=~a~%" name value))
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(define-maybe seat-type)
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(define (greeter-session? value)
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(memq value '(lightdm-gtk-greeter)))
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(define (serialize-greeter-session name value)
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(format #f "~a=~a~%" name value))
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(define-maybe greeter-session)
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(define-maybe string)
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;;; Note: all the fields except for the seat name should be 'maybe's, since
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;;; the real default value is set by the %lightdm-seat-default define later,
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;;; and this avoids repeating ourselves in the serialized configuration file.
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(define-configuration lightdm-seat-configuration
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(name
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seat-name
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"The name of the seat. An asterisk (*) can be used in the name
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to apply the seat configuration to all the seat names it matches.")
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(user-session
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maybe-string
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"The session to use by default. The session name must be provided as a
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lowercase string, such as @code{\"gnome\"}, @code{\"ratpoison\"}, etc.")
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(type
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(seat-type 'local)
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"The type of the seat, either the @code{local} or @code{xremote} symbol.")
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(autologin-user
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maybe-string
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"The username to automatically log in with by default.")
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(greeter-session
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(greeter-session 'lightdm-gtk-greeter)
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"The greeter session to use, specified as a symbol. Currently, only
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@code{lightdm-gtk-greeter} is supported.")
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;; Note: xserver-command must be lazily computed, so that it can be
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;; overridden via 'lightdm-configuration-xorg-configuration'.
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(xserver-command
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maybe-file-like
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"The Xorg server command to run.")
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(session-wrapper
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(file-like (xinitrc))
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"The xinitrc session wrapper to use.")
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(extra-config
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(list-of-strings '())
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"Extra configuration values to append to the seat configuration section."))
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(define (greeter-session->greater-configuration-pred identifier)
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"Return the predicate to check if a configuration is of the type specifying
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a greeter identified by IDENTIFIER."
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(match identifier
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;; Note: register any new greeter identifier here.
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('lightdm-gtk-greeter
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lightdm-gtk-greeter-configuration?)))
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(define (greeter-configuration->greeter-session config)
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"Given CONFIG, a greeter configuration object, return its identifier,
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a symbol."
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(let ((suffix "-configuration")
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(greeter-conf-name (config->name config)))
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(string->symbol (string-drop-right (symbol->string greeter-conf-name)
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(string-length suffix)))))
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(define list-of-seat-configurations?
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(list-of lightdm-seat-configuration?))
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;;;
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;;; LightDM.
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;;;
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(define (greeter-configuration? config)
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(or (lightdm-gtk-greeter-configuration? config)
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;; Note: register any new greeter configuration here.
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))
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(define (list-of-greeter-configurations? greeter-configs)
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(and ((list-of greeter-configuration?) greeter-configs)
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;; Greeter configurations must also not be provided more than once.
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(let* ((types (map (compose record-type-name struct-vtable)
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greeter-configs))
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(dupes (filter (lambda (type)
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(< 1 (count (cut eq? type <>) types)))
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types)))
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(unless (null? dupes)
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(leave (G_ "duplicate greeter configurations: ~a~%") dupes)))))
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(define-configuration/no-serialization lightdm-configuration
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(lightdm
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(file-like lightdm)
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"The lightdm package to use.")
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(allow-empty-passwords?
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(boolean #f)
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"Whether users not having a password set can login.")
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(debug?
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(boolean #f)
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"Enable verbose output.")
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(xorg-configuration
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(xorg-configuration (xorg-configuration))
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"The default Xorg server configuration to use to generate the Xorg server
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start script. It can be refined per seat via the @code{xserver-command} of
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the @code{<lightdm-seat-configuration>} record, if desired.")
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(greeters
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(list-of-greeter-configurations (list (lightdm-gtk-greeter-configuration)))
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"The LightDM greeter configurations specifying the greeters to use.")
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(seats
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(list-of-seat-configurations (list (lightdm-seat-configuration
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(name "*"))))
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"The seat configurations to use. A LightDM seat is akin to a user.")
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(xdmcp?
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(boolean #f)
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"Whether a XDMCP server should listen on port UDP 177.")
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(xdmcp-listen-address
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maybe-string
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"The host or IP address the XDMCP server listens for incoming connections.
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When unspecified, listen on for any hosts/IP addresses.")
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(vnc-server?
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(boolean #f)
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"Whether a VNC server is started.")
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(vnc-server-command
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(file-like (file-append tigervnc-server "bin/Xvnc"))
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"The Xvnc command to use for the VNC server, it's possible to provide extra
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options not otherwise exposed along the command, for example to disable
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security:
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@lisp
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(vnc-server-command
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(file-append tigervnc-server \"/bin/Xvnc\"
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\" -SecurityTypes None\" ))
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@end lisp
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Or to set a PasswordFile for the classic (unsecure) VncAuth mechanism:
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@lisp
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(vnc-server-command
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(file-append tigervnc-server \"/bin/Xvnc\"
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\" -PasswordFile /var/lib/lightdm/.vnc/passwd\"))
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@end lisp
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The password file should be manually created using the @command{vncpasswd}
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command.
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Note that LightDM will create new sessions for VNC users, which means they
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need to authenticate in the same way as local users would.
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")
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(vnc-server-listen-address
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maybe-string
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"The host or IP address the VNC server listens for incoming connections.
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When unspecified, listen for any hosts/IP addresses.")
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(vnc-server-port
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(number 5900)
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"The TCP port the VNC server should listen to.")
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(extra-config
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(list-of-strings '())
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"Extra configuration values to append to the LightDM configuration file."))
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(define (lightdm-configuration->greeters-config-dir config)
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"Return a directory containing all the serialized greeter configurations
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from CONFIG, a <lightdm-configuration> object."
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(file-union "etc-lightdm"
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(append-map (lambda (g)
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`((,(greeter-configuration->conf-name g)
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,(greeter-configuration->file g))))
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(lightdm-configuration-greeters config))))
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(define (lightdm-configuration->packages config)
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"Return all the greeter packages and their assets defined in CONFIG, a
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<lightdm-configuration> object, as well as the lightdm package itself."
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(cons (lightdm-configuration-lightdm config)
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(append-map greeter-configuration->packages
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(lightdm-configuration-greeters config))))
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(define (validate-lightdm-configuration config)
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"Sanity check CONFIG, a <lightdm-configuration> record instance."
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;; This is required to make inter-field validations, such as between the
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;; seats and greeters.
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(let* ((seats (lightdm-configuration-seats config))
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(greeter-sessions (delete-duplicates
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(map lightdm-seat-configuration-greeter-session
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seats)
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eq?))
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(greeter-configurations (lightdm-configuration-greeters config))
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(missing-greeters
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(filter-map
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(lambda (id)
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(define pred (greeter-session->greater-configuration-pred id))
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(if (find pred greeter-configurations)
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#f ;happy path
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id))
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greeter-sessions)))
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(unless (null? missing-greeters)
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(leave (G_ "no greeter configured for seat greeter sessions: ~a~%")
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missing-greeters))))
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(define (lightdm-configuration-file config)
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(match-record config <lightdm-configuration>
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(xorg-configuration seats
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xdmcp? xdmcp-listen-address
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vnc-server? vnc-server-command vnc-server-listen-address vnc-server-port
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extra-config)
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(apply
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mixed-text-file
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"lightdm.conf" "
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#
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# General configuration
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#
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[LightDM]
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greeter-user=lightdm
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sessions-directory=/run/current-system/profile/share/xsessions\
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:/run/current-system/profile/share/wayland-sessions
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remote-sessions-directory=/run/current-system/profile/share/remote-sessions
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"
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#~(string-join '#$extra-config "\n")
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"
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#
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# XDMCP Server configuration
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#
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[XDMCPServer]
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enabled=" (if xdmcp? "true" "false") "\n"
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(if (maybe-value-set? xdmcp-listen-address)
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(format #f "xdmcp-listen-address=~a" xdmcp-listen-address)
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"") "
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#
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# VNC Server configuration
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#
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[VNCServer]
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enabled=" (if vnc-server? "true" "false") "
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command=" vnc-server-command "
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port=" (number->string vnc-server-port) "\n"
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(if (maybe-value-set? vnc-server-listen-address)
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(format #f "vnc-server-listen-address=~a" vnc-server-listen-address)
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"") "
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#
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# Seat configuration.
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#
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"
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(map (lambda (seat)
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;; This complication exists to propagate a default value for
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;; the 'xserver-command' field of the seats. Having a
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;; 'xorg-configuration' field at the root of the
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;; lightdm-configuration enables the use of
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;; 'set-xorg-configuration' and can be more convenient.
|
||
(let ((seat* (if (maybe-value-set?
|
||
(lightdm-seat-configuration-xserver-command seat))
|
||
seat
|
||
(lightdm-seat-configuration
|
||
(inherit seat)
|
||
(xserver-command (xorg-start-command
|
||
xorg-configuration))))))
|
||
(serialize-configuration seat*
|
||
lightdm-seat-configuration-fields)))
|
||
seats))))
|
||
|
||
(define %lightdm-accounts
|
||
(list (user-group (name "lightdm") (system? #t))
|
||
(user-account
|
||
(name "lightdm")
|
||
(group "lightdm")
|
||
(system? #t)
|
||
(comment "LightDM user")
|
||
(home-directory "/var/lib/lightdm")
|
||
(shell (file-append shadow "/sbin/nologin")))))
|
||
|
||
(define %lightdm-activation
|
||
;; Ensure /var/lib/lightdm is owned by the "lightdm" user. Adapted from the
|
||
;; %gdm-activation.
|
||
(with-imported-modules '((guix build utils))
|
||
#~(begin
|
||
(use-modules (guix build utils))
|
||
|
||
(define (ensure-ownership directory)
|
||
(let* ((lightdm (getpwnam "lightdm"))
|
||
(uid (passwd:uid lightdm))
|
||
(gid (passwd:gid lightdm))
|
||
(st (stat directory #f)))
|
||
;; Recurse into directory only if it has wrong ownership.
|
||
(when (and st
|
||
(or (not (= uid (stat:uid st)))
|
||
(not (= gid (stat:gid st)))))
|
||
(for-each (lambda (file)
|
||
(chown file uid gid))
|
||
(find-files "directory"
|
||
#:directories? #t)))))
|
||
|
||
(when (not (stat "/var/lib/lightdm-data" #f))
|
||
(mkdir-p "/var/lib/lightdm-data"))
|
||
(for-each ensure-ownership
|
||
'("/var/lib/lightdm"
|
||
"/var/lib/lightdm-data")))))
|
||
|
||
(define (lightdm-pam-service config)
|
||
"Return a PAM service for @command{lightdm}."
|
||
(unix-pam-service "lightdm"
|
||
#:login-uid? #t
|
||
#:allow-empty-passwords?
|
||
(lightdm-configuration-allow-empty-passwords? config)))
|
||
|
||
(define (lightdm-greeter-pam-service)
|
||
"Return a PAM service for @command{lightdm-greeter}."
|
||
(pam-service
|
||
(name "lightdm-greeter")
|
||
(auth (list
|
||
;; Load environment from /etc/environment and ~/.pam_environment.
|
||
(pam-entry (control "required") (module "pam_env.so"))
|
||
;; Always let the greeter start without authentication.
|
||
(pam-entry (control "required") (module "pam_permit.so"))))
|
||
;; No action required for account management
|
||
(account (list (pam-entry (control "required") (module "pam_permit.so"))))
|
||
;; Prohibit changing password.
|
||
(password (list (pam-entry (control "required") (module "pam_deny.so"))))
|
||
;; Setup session.
|
||
(session (list (pam-entry (control "required") (module "pam_unix.so"))))))
|
||
|
||
(define (lightdm-autologin-pam-service)
|
||
"Return a PAM service for @command{lightdm-autologin}}."
|
||
(pam-service
|
||
(name "lightdm-autologin")
|
||
(auth
|
||
(list
|
||
;; Block login if user is globally disabled.
|
||
(pam-entry (control "required") (module "pam_nologin.so"))
|
||
(pam-entry (control "required") (module "pam_succeed_if.so")
|
||
(arguments (list "uid >= 1000")))
|
||
;; Allow access without authentication.
|
||
(pam-entry (control "required") (module "pam_permit.so"))))
|
||
;; Stop autologin if account requires action.
|
||
(account (list (pam-entry (control "required") (module "pam_unix.so"))))
|
||
;; Prohibit changing password.
|
||
(password (list (pam-entry (control "required") (module "pam_deny.so"))))
|
||
;; Setup session.
|
||
(session (list (pam-entry (control "required") (module "pam_unix.so"))))))
|
||
|
||
(define (lightdm-pam-services config)
|
||
(list (lightdm-pam-service config)
|
||
(lightdm-greeter-pam-service)
|
||
(lightdm-autologin-pam-service)))
|
||
|
||
(define (lightdm-shepherd-service config)
|
||
"Return a <lightdm-service> for LightDM using CONFIG."
|
||
|
||
(validate-lightdm-configuration config)
|
||
|
||
(define lightdm-command
|
||
#~(list #$(file-append (lightdm-configuration-lightdm config)
|
||
"/sbin/lightdm")
|
||
#$@(if (lightdm-configuration-debug? config)
|
||
#~("--debug")
|
||
#~())
|
||
"--config"
|
||
#$(lightdm-configuration-file config)))
|
||
|
||
(define lightdm-paths
|
||
(let ((lightdm (lightdm-configuration-lightdm config)))
|
||
#~(string-join
|
||
'#$(map (lambda (dir)
|
||
(file-append lightdm dir))
|
||
'("/bin" "/sbin" "/libexec"))
|
||
":")))
|
||
|
||
(define greeters-config-dir
|
||
(lightdm-configuration->greeters-config-dir config))
|
||
|
||
(define data-dirs
|
||
;; LightDM itself needs to be in XDG_DATA_DIRS for the accountsservice
|
||
;; interface it provides to be picked up. The greeters must also be in
|
||
;; XDG_DATA_DIRS to be found.
|
||
(let ((packages (lightdm-configuration->packages config)))
|
||
#~(string-join '#$(map (cut file-append <> "/share") packages)
|
||
":")))
|
||
|
||
(list
|
||
(shepherd-service
|
||
(documentation "LightDM display manager")
|
||
(requirement '(dbus-system user-processes host-name))
|
||
(provision '(lightdm display-manager xorg-server))
|
||
(respawn? #f)
|
||
(start
|
||
#~(lambda ()
|
||
;; Note: sadly, environment variables defined for 'lightdm' are
|
||
;; cleared and/or overridden by /etc/profile by its spawned greeters,
|
||
;; so an out-of-band means such as /etc is required.
|
||
(fork+exec-command #$lightdm-command
|
||
;; Lightdm needs itself in its PATH.
|
||
#:environment-variables
|
||
(list
|
||
;; It knows to look for greeter configurations in
|
||
;; XDG_CONFIG_DIRS...
|
||
(string-append "XDG_CONFIG_DIRS="
|
||
#$greeters-config-dir)
|
||
;; ... and for greeter .desktop files as well as
|
||
;; lightdm accountsservice interface in
|
||
;; XDG_DATA_DIRS.
|
||
(string-append "XDG_DATA_DIRS="
|
||
#$data-dirs)
|
||
(string-append "PATH=" #$lightdm-paths)))))
|
||
(stop #~(make-kill-destructor)))))
|
||
|
||
(define lightdm-service-type
|
||
(handle-xorg-configuration
|
||
lightdm-configuration
|
||
(service-type
|
||
(name 'lightdm)
|
||
(default-value (lightdm-configuration))
|
||
(extensions
|
||
(list (service-extension pam-root-service-type lightdm-pam-services)
|
||
(service-extension shepherd-root-service-type
|
||
lightdm-shepherd-service)
|
||
(service-extension activation-service-type
|
||
(const %lightdm-activation))
|
||
(service-extension dbus-root-service-type
|
||
(compose list lightdm-configuration-lightdm))
|
||
(service-extension polkit-service-type
|
||
(compose list lightdm-configuration-lightdm))
|
||
(service-extension account-service-type
|
||
(const %lightdm-accounts))
|
||
;; Add 'lightdm' to the system profile, so that its
|
||
;; 'share/accountsservice' D-Bus service extension directory can be
|
||
;; found via the 'XDG_DATA_DIRS=/run/current-system/profile/share'
|
||
;; environment variable set in the wrapper of the
|
||
;; libexec/accounts-daemon binary of the accountsservice package.
|
||
;; This daemon is spawned by D-Bus, and there's little we can do to
|
||
;; affect its environment. For more reading, see:
|
||
;; https://github.com/NixOS/nixpkgs/issues/45059.
|
||
(service-extension profile-service-type
|
||
lightdm-configuration->packages)
|
||
;; This is needed for the greeter itself to find its configuration,
|
||
;; because XDG_CONF_DIRS gets overridden by /etc/profile.
|
||
(service-extension
|
||
etc-service-type
|
||
(lambda (config)
|
||
`(("lightdm"
|
||
,(lightdm-configuration->greeters-config-dir config)))))))
|
||
(description "Run @code{lightdm}, the LightDM graphical login manager."))))
|
||
|
||
|
||
;;;
|
||
;;; Generate documentation.
|
||
;;;
|
||
(define (generate-doc)
|
||
(configuration->documentation 'lightdm-configuration)
|
||
(configuration->documentation 'lightdm-gtk-greeter-configuration)
|
||
(configuration->documentation 'lightdm-seat-configuration))
|