;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014, 2015, 2016, 2017, 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2015 Andy Wingo <wingo@igalia.com>
;;; Copyright © 2015 Mark H Weaver <mhw@netris.org>
;;; Copyright © 2016 Sou Bunnbu <iyzsong@gmail.com>
;;; Copyright © 2017, 2020 Maxim Cournoyer <maxim.cournoyer@gmail.com>
;;; Copyright © 2017 Nikita <nikita@n0.is>
;;; Copyright © 2018, 2020 Efraim Flashner <efraim@flashner.co.il>
;;; Copyright © 2018 Ricardo Wurmus <rekado@elephly.net>
;;; Copyright © 2017, 2019 Christopher Baines <mail@cbaines.net>
;;; Copyright © 2019 Tim Gesthuizen <tim.gesthuizen@yahoo.de>
;;; Copyright © 2019 David Wilson <david@daviwil.com>
;;; Copyright © 2020 Tobias Geerinckx-Rice <me@tobias.gr>
;;; Copyright © 2020 Reza Alizadeh Majd <r.majd@pantherx.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu services desktop)
  #:use-module (gnu services)
  #:use-module (gnu services shepherd)
  #:use-module (gnu services base)
  #:use-module (gnu services dbus)
  #:use-module (gnu services avahi)
  #:use-module (gnu services xorg)
  #:use-module (gnu services networking)
  #:use-module (gnu services sound)
  #:use-module ((gnu system file-systems)
                #:select (%elogind-file-systems file-system))
  #:use-module (gnu system)
  #:use-module (gnu system shadow)
  #:use-module (gnu system pam)
  #:use-module (gnu packages glib)
  #:use-module (gnu packages admin)
  #:use-module (gnu packages cups)
  #:use-module (gnu packages freedesktop)
  #:use-module (gnu packages gnome)
  #:use-module (gnu packages xfce)
  #:use-module (gnu packages avahi)
  #:use-module (gnu packages xdisorg)
  #:use-module (gnu packages scanner)
  #:use-module (gnu packages suckless)
  #:use-module (gnu packages linux)
  #:use-module (gnu packages libusb)
  #:use-module (gnu packages lxqt)
  #:use-module (gnu packages mate)
  #:use-module (gnu packages nfs)
  #:use-module (gnu packages enlightenment)
  #:use-module (guix deprecation)
  #:use-module (guix records)
  #:use-module (guix packages)
  #:use-module (guix store)
  #:use-module (guix utils)
  #:use-module (guix gexp)
  #:use-module (srfi srfi-1)
  #:use-module (ice-9 match)
  #:export (<upower-configuration>
            upower-configuration
            upower-configuration?
            upower-configuration-upower
            upower-configuration-watts-up-pro?
            upower-configuration-poll-batteries?
            upower-configuration-ignore-lid?
            upower-configuration-use-percentage-for-policy?
            upower-configuration-percentage-low
            upower-configuration-percentage-critical
            upower-configuration-percentage-action
            upower-configuration-time-low
            upower-configuration-time-critical
            upower-configuration-time-action
            upower-configuration-critical-power-action

            upower-service-type

            udisks-configuration
            udisks-configuration?
            udisks-service
            udisks-service-type

            colord-service-type

            geoclue-application
            geoclue-configuration
            geoclue-configuration?
            %standard-geoclue-applications
            geoclue-service
            geoclue-service-type

            bluetooth-service-type
            bluetooth-configuration
            bluetooth-configuration?
            bluetooth-service

            elogind-configuration
            elogind-configuration?
            elogind-service
            elogind-service-type

            %fontconfig-file-system
            fontconfig-file-system-service

            accountsservice-service-type
            accountsservice-service

            cups-pk-helper-service-type
            sane-service-type

            gnome-desktop-configuration
            gnome-desktop-configuration?
            gnome-desktop-service
            gnome-desktop-service-type

            mate-desktop-configuration
            mate-desktop-configuration?
            mate-desktop-service
            mate-desktop-service-type

            lxqt-desktop-configuration
            lxqt-desktop-configuration?
            lxqt-desktop-service-type

            xfce-desktop-configuration
            xfce-desktop-configuration?
            xfce-desktop-service
            xfce-desktop-service-type

            x11-socket-directory-service

            enlightenment-desktop-configuration
            enlightenment-desktop-configuration?
            enlightenment-desktop-service-type

            inputattach-configuration
            inputattach-configuration?
            inputattach-service-type

            polkit-wheel-service

            gnome-keyring-configuration
            gnome-keyring-configuration?
            gnome-keyring-service-type

            %desktop-services))

;;; Commentary:
;;;
;;; This module contains service definitions for a "desktop" environment.
;;;
;;; Code:


;;;
;;; Helpers.
;;;

(define (bool value)
  (if value "true\n" "false\n"))

(define (package-direct-input-selector input)
  (lambda (package)
    (match (assoc-ref (package-direct-inputs package) input)
      ((package . _) package))))



;;;
;;; Upower D-Bus service.
;;;

(define-record-type* <upower-configuration>
  upower-configuration make-upower-configuration
  upower-configuration?
  (upower                     upower-configuration-upower
                              (default upower))
  (watts-up-pro?              upower-configuration-watts-up-pro?
                              (default #f))
  (poll-batteries?            upower-configuration-poll-batteries?
                              (default #t))
  (ignore-lid?                upower-configuration-ignore-lid?
                              (default #f))
  (use-percentage-for-policy? upower-configuration-use-percentage-for-policy?
                              (default #f))
  (percentage-low             upower-configuration-percentage-low
                              (default 10))
  (percentage-critical        upower-configuration-percentage-critical
                              (default 3))
  (percentage-action          upower-configuration-percentage-action
                              (default 2))
  (time-low                   upower-configuration-time-low
                              (default 1200))
  (time-critical              upower-configuration-time-critical
                              (default 300))
  (time-action                upower-configuration-time-action
                              (default 120))
  (critical-power-action      upower-configuration-critical-power-action
                              (default 'hybrid-sleep)))

(define* upower-configuration-file
  ;; Return an upower-daemon configuration file.
  (match-lambda
    (($ <upower-configuration> upower
        watts-up-pro? poll-batteries? ignore-lid? use-percentage-for-policy?
        percentage-low percentage-critical percentage-action time-low
        time-critical time-action critical-power-action)
     (plain-file "UPower.conf"
                 (string-append
                  "[UPower]\n"
                  "EnableWattsUpPro=" (bool watts-up-pro?)
                  "NoPollBatteries=" (bool (not poll-batteries?))
                  "IgnoreLid=" (bool ignore-lid?)
                  "UsePercentageForPolicy=" (bool use-percentage-for-policy?)
                  "PercentageLow=" (number->string percentage-low) "\n"
                  "PercentageCritical=" (number->string percentage-critical) "\n"
                  "PercentageAction=" (number->string percentage-action) "\n"
                  "TimeLow=" (number->string time-low) "\n"
                  "TimeCritical=" (number->string time-critical) "\n"
                  "TimeAction=" (number->string time-action) "\n"
                  "CriticalPowerAction=" (match critical-power-action
                                           ('hybrid-sleep "HybridSleep")
                                           ('hibernate "Hibernate")
                                           ('power-off "PowerOff"))
                  "\n")))))

(define %upower-activation
  #~(begin
      (use-modules (guix build utils))
      (mkdir-p "/var/lib/upower")))

(define (upower-dbus-service config)
  (list (wrapped-dbus-service (upower-configuration-upower config)
                              "libexec/upowerd"
                              `(("UPOWER_CONF_FILE_NAME"
                                 ,(upower-configuration-file config))))))

(define (upower-shepherd-service config)
  "Return a shepherd service for UPower with CONFIG."
  (let ((upower (upower-configuration-upower config))
        (config (upower-configuration-file config)))
    (list (shepherd-service
           (documentation "Run the UPower power and battery monitor.")
           (provision '(upower-daemon))
           (requirement '(dbus-system udev))

           (start #~(make-forkexec-constructor
                     (list (string-append #$upower "/libexec/upowerd"))
                     #:environment-variables
                     (list (string-append "UPOWER_CONF_FILE_NAME="
                                          #$config))))
           (stop #~(make-kill-destructor))))))

(define upower-service-type
  (let ((upower-package (compose list upower-configuration-upower)))
    (service-type (name 'upower)
                  (description
                   "Run @command{upowerd}}, a system-wide monitor for power
consumption and battery levels, with the given configuration settings.  It
implements the @code{org.freedesktop.UPower} D-Bus interface, and is notably
used by GNOME.")
                  (extensions
                   (list (service-extension dbus-root-service-type
                                            upower-dbus-service)
                         (service-extension shepherd-root-service-type
                                            upower-shepherd-service)
                         (service-extension activation-service-type
                                            (const %upower-activation))
                         (service-extension udev-service-type
                                            upower-package)

                         ;; Make the 'upower' command visible.
                         (service-extension profile-service-type
                                            upower-package)))
                  (default-value (upower-configuration)))))


;;;
;;; GeoClue D-Bus service.
;;;

;; TODO: Export.
(define-record-type* <geoclue-configuration>
  geoclue-configuration make-geoclue-configuration
  geoclue-configuration?
  (geoclue geoclue-configuration-geoclue
           (default geoclue))
  (whitelist geoclue-configuration-whitelist)
  (wifi-geolocation-url geoclue-configuration-wifi-geolocation-url)
  (submit-data? geoclue-configuration-submit-data?)
  (wifi-submission-url geoclue-configuration-wifi-submission-url)
  (submission-nick geoclue-configuration-submission-nick)
  (applications geoclue-configuration-applications))

(define* (geoclue-application name #:key (allowed? #t) system? (users '()))
  "Configure default GeoClue access permissions for an application.  NAME is
the Desktop ID of the application, without the .desktop part.  If ALLOWED? is
true, the application will have access to location information by default.
The boolean SYSTEM? value indicates that an application is a system component
or not.  Finally USERS is a list of UIDs of all users for which this
application is allowed location info access.  An empty users list means all
users are allowed."
  (string-append
   "[" name "]\n"
   "allowed=" (bool allowed?)
   "system=" (bool system?)
   "users=" (string-join users ";") "\n"))

(define %standard-geoclue-applications
  (list (geoclue-application "gnome-datetime-panel" #:system? #t)
        (geoclue-application "epiphany" #:system? #f)
        (geoclue-application "firefox" #:system? #f)))

(define* (geoclue-configuration-file config)
  "Return a geoclue configuration file."
  (plain-file "geoclue.conf"
              (string-append
               "[agent]\n"
               "whitelist="
               (string-join (geoclue-configuration-whitelist config)
                            ";") "\n"
               "[wifi]\n"
               "url=" (geoclue-configuration-wifi-geolocation-url config) "\n"
               "submit-data=" (bool (geoclue-configuration-submit-data? config))
               "submission-url="
               (geoclue-configuration-wifi-submission-url config) "\n"
               "submission-nick="
               (geoclue-configuration-submission-nick config)
               "\n"
               (string-join (geoclue-configuration-applications config)
                            "\n"))))

(define (geoclue-dbus-service config)
  (list (wrapped-dbus-service (geoclue-configuration-geoclue config)
                              "libexec/geoclue"
                              `(("GEOCLUE_CONFIG_FILE"
                                 ,(geoclue-configuration-file config))))))

(define %geoclue-accounts
  (list (user-group (name "geoclue") (system? #t))
        (user-account
         (name "geoclue")
         (group "geoclue")
         (system? #t)
         (comment "GeoClue daemon user")
         (home-directory "/var/empty")
         (shell "/run/current-system/profile/sbin/nologin"))))

(define geoclue-service-type
  (service-type (name 'geoclue)
                (extensions
                 (list (service-extension dbus-root-service-type
                                          geoclue-dbus-service)
                       (service-extension account-service-type
                                          (const %geoclue-accounts))))))

(define* (geoclue-service #:key (geoclue geoclue)
                          (whitelist '())
                          (wifi-geolocation-url
                           ;; Mozilla geolocation service:
                           "https://location.services.mozilla.com/v1/geolocate?key=geoclue")
                          (submit-data? #f)
                          (wifi-submission-url
                           "https://location.services.mozilla.com/v1/submit?key=geoclue")
                          (submission-nick "geoclue")
                          (applications %standard-geoclue-applications))
  "Return a service that runs the @command{geoclue} location service.  This
service provides a D-Bus interface to allow applications to request access to
a user's physical location, and optionally to add information to online
location databases.  By default, only the GNOME date-time panel and the Icecat
and Epiphany web browsers are able to ask for the user's location, and in the
case of Icecat and Epiphany, both will ask the user for permission first.  See
@uref{https://wiki.freedesktop.org/www/Software/GeoClue/, the geoclue web
site} for more information."
  (service geoclue-service-type
           (geoclue-configuration
            (geoclue geoclue)
            (whitelist whitelist)
            (wifi-geolocation-url wifi-geolocation-url)
            (submit-data? submit-data?)
            (wifi-submission-url wifi-submission-url)
            (submission-nick submission-nick)
            (applications applications))))


;;;
;;; Bluetooth.
;;;

(define-record-type* <bluetooth-configuration>
  bluetooth-configuration make-bluetooth-configuration
  bluetooth-configuration?
  (bluez bluetooth-configuration-bluez (default bluez))
  (auto-enable? bluetooth-configuration-auto-enable? (default #f)))

(define (bluetooth-configuration-file config)
  "Return a configuration file for the systemd bluetooth service, as a string."
  (string-append
   "[Policy]\n"
   "AutoEnable=" (bool (bluetooth-configuration-auto-enable?
                        config))))

(define (bluetooth-directory config)
  (computed-file "etc-bluetooth"
                 #~(begin
                     (mkdir #$output)
                     (chdir #$output)
                     (call-with-output-file "main.conf"
                       (lambda (port)
                         (display #$(bluetooth-configuration-file config)
                                  port))))))

(define (bluetooth-shepherd-service config)
  "Return a shepherd service for @command{bluetoothd}."
  (shepherd-service
   (provision '(bluetooth))
   (requirement '(dbus-system udev))
   (documentation "Run the bluetoothd daemon.")
   (start #~(make-forkexec-constructor
             (list #$(file-append (bluetooth-configuration-bluez config)
                                  "/libexec/bluetooth/bluetoothd"))))
   (stop #~(make-kill-destructor))))

(define bluetooth-service-type
  (service-type
   (name 'bluetooth)
   (extensions
    (list (service-extension dbus-root-service-type
                             (compose list bluetooth-configuration-bluez))
          (service-extension udev-service-type
                             (compose list bluetooth-configuration-bluez))
          (service-extension etc-service-type
                             (lambda (config)
                               `(("bluetooth"
                                  ,(bluetooth-directory config)))))
          (service-extension shepherd-root-service-type
                             (compose list bluetooth-shepherd-service))))
   (default-value (bluetooth-configuration))
   (description "Run the @command{bluetoothd} daemon, which manages all the
Bluetooth devices and provides a number of D-Bus interfaces.")))

(define* (bluetooth-service #:key (bluez bluez) (auto-enable? #f))
  "Return a service that runs the @command{bluetoothd} daemon, which manages
all the Bluetooth devices and provides a number of D-Bus interfaces.  When
AUTO-ENABLE? is true, the bluetooth controller is powered automatically at
boot.

Users need to be in the @code{lp} group to access the D-Bus service.
"
  (service bluetooth-service-type
           (bluetooth-configuration
            (bluez bluez)
            (auto-enable? auto-enable?))))


;;;
;;; Colord D-Bus service.
;;;

(define %colord-activation
  #~(begin
      (use-modules (guix build utils))
      (mkdir-p "/var/lib/colord")
      (let ((user (getpwnam "colord")))
        (chown "/var/lib/colord"
               (passwd:uid user) (passwd:gid user)))))

(define %colord-accounts
  (list (user-group (name "colord") (system? #t))
        (user-account
         (name "colord")
         (group "colord")
         (system? #t)
         (comment "colord daemon user")
         (home-directory "/var/empty")
         (shell (file-append shadow "/sbin/nologin")))))

(define colord-service-type
  (service-type (name 'colord)
                (extensions
                 (list (service-extension account-service-type
                                          (const %colord-accounts))
                       (service-extension activation-service-type
                                          (const %colord-activation))

                       ;; Colord is a D-Bus service that dbus-daemon can
                       ;; activate.
                       (service-extension dbus-root-service-type list)

                       ;; Colord provides "color device" rules for udev.
                       (service-extension udev-service-type list)

                       ;; It provides polkit "actions".
                       (service-extension polkit-service-type list)))
                (default-value colord)
                (description
                 "Run @command{colord}, a system service with a D-Bus
interface to manage the color profiles of input and output devices such as
screens and scanners.")))


;;;
;;; UDisks.
;;;

(define-record-type* <udisks-configuration>
  udisks-configuration make-udisks-configuration
  udisks-configuration?
  (udisks   udisks-configuration-udisks
            (default udisks)))

(define %udisks-activation
  (with-imported-modules '((guix build utils))
    #~(begin
        (use-modules (guix build utils))

        (let ((run-dir "/var/run/udisks2"))
          (mkdir-p run-dir)
          (chmod run-dir #o700)))))

(define udisks-service-type
  (let ((udisks-package (lambda (config)
                          (list (udisks-configuration-udisks config)))))
    (service-type (name 'udisks)
                  (extensions
                   (list (service-extension polkit-service-type
                                            udisks-package)
                         (service-extension dbus-root-service-type
                                            udisks-package)
                         (service-extension udev-service-type
                                            udisks-package)
                         (service-extension activation-service-type
                                            (const %udisks-activation))

                         ;; Profile 'udisksctl' & co. in the system profile.
                         (service-extension profile-service-type
                                            udisks-package))))))

(define* (udisks-service #:key (udisks udisks))
  "Return a service for @uref{http://udisks.freedesktop.org/docs/latest/,
UDisks}, a @dfn{disk management} daemon that provides user interfaces with
notifications and ways to mount/unmount disks.  Programs that talk to UDisks
include the @command{udisksctl} command, part of UDisks, and GNOME Disks."
  (service udisks-service-type
           (udisks-configuration (udisks udisks))))


;;;
;;; Elogind login and seat management service.
;;;

(define-record-type* <elogind-configuration> elogind-configuration
  make-elogind-configuration
  elogind-configuration?
  (elogind                          elogind-package
                                    (default elogind))
  (kill-user-processes?             elogind-kill-user-processes?
                                    (default #f))
  (kill-only-users                  elogind-kill-only-users
                                    (default '()))
  (kill-exclude-users               elogind-kill-exclude-users
                                    (default '("root")))
  (inhibit-delay-max-seconds        elogind-inhibit-delay-max-seconds
                                    (default 5))
  (handle-power-key                 elogind-handle-power-key
                                    (default 'poweroff))
  (handle-suspend-key               elogind-handle-suspend-key
                                    (default 'suspend))
  (handle-hibernate-key             elogind-handle-hibernate-key
                                    ;; (default 'hibernate)
                                    ;; XXX Ignore it for now, since we don't
                                    ;; yet handle resume-from-hibernation in
                                    ;; our initrd.
                                    (default 'ignore))
  (handle-lid-switch                elogind-handle-lid-switch
                                    (default 'suspend))
  (handle-lid-switch-docked         elogind-handle-lid-switch-docked
                                    (default 'ignore))
  (handle-lid-switch-external-power elogind-handle-lid-switch-external-power
                                    (default 'ignore))
  (power-key-ignore-inhibited?      elogind-power-key-ignore-inhibited?
                                    (default #f))
  (suspend-key-ignore-inhibited?    elogind-suspend-key-ignore-inhibited?
                                    (default #f))
  (hibernate-key-ignore-inhibited?  elogind-hibernate-key-ignore-inhibited?
                                    (default #f))
  (lid-switch-ignore-inhibited?     elogind-lid-switch-ignore-inhibited?
                                    (default #t))
  (holdoff-timeout-seconds          elogind-holdoff-timeout-seconds
                                    (default 30))
  (idle-action                      elogind-idle-action
                                    (default 'ignore))
  (idle-action-seconds              elogind-idle-action-seconds
                                    (default (* 30 60)))
  (runtime-directory-size-percent   elogind-runtime-directory-size-percent
                                    (default 10))
  (runtime-directory-size           elogind-runtime-directory-size
                                    (default #f))
  (remove-ipc?                      elogind-remove-ipc?
                                    (default #t))

  (suspend-state                    elogind-suspend-state
                                    (default '("mem" "standby" "freeze")))
  (suspend-mode                     elogind-suspend-mode
                                    (default '()))
  (hibernate-state                  elogind-hibernate-state
                                    (default '("disk")))
  (hibernate-mode                   elogind-hibernate-mode
                                    (default '("platform" "shutdown")))
  (hybrid-sleep-state               elogind-hybrid-sleep-state
                                    (default '("disk")))
  (hybrid-sleep-mode                elogind-hybrid-sleep-mode
                                    (default
                                      '("suspend" "platform" "shutdown"))))

(define (elogind-configuration-file config)
  (define (yesno x)
    (match x
      (#t "yes")
      (#f "no")
      (_ (error "expected #t or #f, instead got:" x))))
  (define char-set:user-name
    (string->char-set "abcdefghijklmnopqrstuvwxyz0123456789_-"))
  (define (valid-list? l pred)
    (and-map (lambda (x) (string-every pred x)) l))
  (define (user-name-list users)
    (unless (valid-list? users char-set:user-name)
      (error "invalid user list" users))
    (string-join users " "))
  (define (enum val allowed)
    (unless (memq val allowed)
      (error "invalid value" val allowed))
    (symbol->string val))
  (define (non-negative-integer x)
    (unless (exact-integer? x) (error "not an integer" x))
    (when (negative? x) (error "negative number not allowed" x))
    (number->string x))
  (define handle-actions
    '(ignore poweroff reboot halt kexec suspend hibernate hybrid-sleep lock))
  (define (handle-action x)
    (enum x handle-actions))
  (define (sleep-list tokens)
    (unless (valid-list? tokens char-set:user-name)
      (error "invalid sleep list" tokens))
    (string-join tokens " "))
  (define-syntax ini-file-clause
    (syntax-rules ()
      ((_ config (prop (parser getter)))
       (string-append prop "=" (parser (getter config)) "\n"))
      ((_ config str)
       (string-append str "\n"))))
  (define-syntax-rule (ini-file config file clause ...)
    (plain-file file (string-append (ini-file-clause config clause) ...)))
  (ini-file
   config "logind.conf"
   "[Login]"
   ("KillUserProcesses" (yesno elogind-kill-user-processes?))
   ("KillOnlyUsers" (user-name-list elogind-kill-only-users))
   ("KillExcludeUsers" (user-name-list elogind-kill-exclude-users))
   ("InhibitDelayMaxSec" (non-negative-integer elogind-inhibit-delay-max-seconds))
   ("HandlePowerKey" (handle-action elogind-handle-power-key))
   ("HandleSuspendKey" (handle-action elogind-handle-suspend-key))
   ("HandleHibernateKey" (handle-action elogind-handle-hibernate-key))
   ("HandleLidSwitch" (handle-action elogind-handle-lid-switch))
   ("HandleLidSwitchDocked" (handle-action elogind-handle-lid-switch-docked))
   ("HandleLidSwitchExternalPower" (handle-action elogind-handle-lid-switch-external-power))
   ("PowerKeyIgnoreInhibited" (yesno elogind-power-key-ignore-inhibited?))
   ("SuspendKeyIgnoreInhibited" (yesno elogind-suspend-key-ignore-inhibited?))
   ("HibernateKeyIgnoreInhibited" (yesno elogind-hibernate-key-ignore-inhibited?))
   ("LidSwitchIgnoreInhibited" (yesno elogind-lid-switch-ignore-inhibited?))
   ("HoldoffTimeoutSec" (non-negative-integer elogind-holdoff-timeout-seconds))
   ("IdleAction" (handle-action elogind-idle-action))
   ("IdleActionSec" (non-negative-integer elogind-idle-action-seconds))
   ("RuntimeDirectorySize"
    (identity
     (lambda (config)
       (match (elogind-runtime-directory-size-percent config)
         (#f (non-negative-integer (elogind-runtime-directory-size config)))
         (percent (string-append (non-negative-integer percent) "%"))))))
   ("RemoveIPC" (yesno elogind-remove-ipc?))
   "[Sleep]"
   ("SuspendState" (sleep-list elogind-suspend-state))
   ("SuspendMode" (sleep-list elogind-suspend-mode))
   ("HibernateState" (sleep-list elogind-hibernate-state))
   ("HibernateMode" (sleep-list elogind-hibernate-mode))
   ("HybridSleepState" (sleep-list elogind-hybrid-sleep-state))
   ("HybridSleepMode" (sleep-list elogind-hybrid-sleep-mode))))

(define (elogind-dbus-service config)
  (list (wrapped-dbus-service (elogind-package config)
                              "libexec/elogind/elogind"
                              `(("ELOGIND_CONF_FILE"
                                 ,(elogind-configuration-file config))))))

(define (pam-extension-procedure config)
  "Return an extension for PAM-ROOT-SERVICE-TYPE that ensures that all the PAM
services use 'pam_elogind.so', a module that allows elogind to keep track of
logged-in users (run 'loginctl' to see elogind's world view of users and
seats.)"
  (define pam-elogind
    (pam-entry
     (control "required")
     (module (file-append (elogind-package config)
                          "/lib/security/pam_elogind.so"))))

  (list (lambda (pam)
          (pam-service
           (inherit pam)
           (session (cons pam-elogind (pam-service-session pam)))))))

(define (elogind-shepherd-service config)
  "Return a Shepherd service to start elogind according to @var{config}."
  (list (shepherd-service
         (requirement '(dbus-system))
         (provision '(elogind))
         (start #~(make-forkexec-constructor
                   (list #$(file-append (elogind-package config)
                                        "/libexec/elogind/elogind"))
                   #:environment-variables
                   (list (string-append "ELOGIND_CONF_FILE="
                                        #$(elogind-configuration-file
                                           config)))))
         (stop #~(make-kill-destructor)))))

(define elogind-service-type
  (service-type (name 'elogind)
                (extensions
                 (list (service-extension dbus-root-service-type
                                          elogind-dbus-service)
                       (service-extension udev-service-type
                                          (compose list elogind-package))
                       (service-extension polkit-service-type
                                          (compose list elogind-package))

                       ;; Start elogind from the Shepherd rather than waiting
                       ;; for bus activation.  This ensures that it can handle
                       ;; events like lid close, etc.
                       (service-extension shepherd-root-service-type
                                          elogind-shepherd-service)

                       ;; Provide the 'loginctl' command.
                       (service-extension profile-service-type
                                          (compose list elogind-package))

                       ;; Extend PAM with pam_elogind.so.
                       (service-extension pam-root-service-type
                                          pam-extension-procedure)

                       ;; We need /run/user, /run/systemd, etc.
                       (service-extension file-system-service-type
                                          (const %elogind-file-systems))))
                (default-value (elogind-configuration))))

(define* (elogind-service #:key (config (elogind-configuration)))
  "Return a service that runs the @command{elogind} login and seat management
service.  The @command{elogind} service integrates with PAM to allow other
system components to know the set of logged-in users as well as their session
types (graphical, console, remote, etc.).  It can also clean up after users
when they log out."
  (service elogind-service-type config))


;;;
;;; Fontconfig and other desktop file-systems.
;;;

(define %fontconfig-file-system
  (file-system
    (device "none")
    (mount-point "/var/cache/fontconfig")
    (type "tmpfs")
    (flags '(read-only))
    (check? #f)))

;; The global fontconfig cache directory can sometimes contain stale entries,
;; possibly referencing fonts that have been GC'd, so mount it read-only.
;; As mentioned https://debbugs.gnu.org/cgi/bugreport.cgi?bug=36924#8 and
;; https://debbugs.gnu.org/cgi/bugreport.cgi?bug=38046#10 and elsewhere.
(define fontconfig-file-system-service
  (simple-service 'fontconfig-file-system
                  file-system-service-type
                  (list %fontconfig-file-system)))

;;;
;;; AccountsService service.
;;;

(define %accountsservice-activation
  #~(begin
      (use-modules (guix build utils))
      (mkdir-p "/var/lib/AccountsService")))

(define accountsservice-service-type
  (service-type (name 'accountsservice)
                (extensions
                 (list (service-extension activation-service-type
                                          (const %accountsservice-activation))
                       (service-extension dbus-root-service-type list)
                       (service-extension polkit-service-type list)))
                (default-value accountsservice)))

(define* (accountsservice-service #:key (accountsservice accountsservice))
  "Return a service that runs AccountsService, a system service that
can list available accounts, change their passwords, and so on.
AccountsService integrates with PolicyKit to enable unprivileged users to
acquire the capability to modify their system configuration.
@uref{https://www.freedesktop.org/wiki/Software/AccountsService/, the
accountsservice web site} for more information."
  (service accountsservice-service-type accountsservice))


;;;
;;; cups-pk-helper service.
;;;

(define cups-pk-helper-service-type
  (service-type
   (name 'cups-pk-helper)
   (description
    "PolicyKit helper to configure CUPS with fine-grained privileges.")
   (extensions
    (list (service-extension dbus-root-service-type list)
          (service-extension polkit-service-type list)))
   (default-value cups-pk-helper)))


;;;
;;; Scanner access via SANE.
;;;

(define %sane-accounts
  ;; The '60-libsane.rules' udev rules refers to the "scanner" group.
  (list (user-group (name "scanner") (system? #t))))

(define sane-service-type
  (service-type
   (name 'sane)
   (description
    "This service provides access to scanners @i{via}
@uref{http://www.sane-project.org, SANE} by installing the necessary udev
rules.")
   (default-value sane-backends-minimal)
   (extensions
    (list (service-extension udev-service-type list)
          (service-extension account-service-type
                             (const %sane-accounts))))))



;;;
;;; GNOME desktop service.
;;;

(define-record-type* <gnome-desktop-configuration> gnome-desktop-configuration
  make-gnome-desktop-configuration
  gnome-desktop-configuration?
  (gnome gnome-package (default gnome)))

(define (gnome-polkit-settings config)
  "Return the list of GNOME dependencies that provide polkit actions and
rules."
  (let ((gnome (gnome-package config)))
    (map (lambda (name)
           ((package-direct-input-selector name) gnome))
         '("gnome-settings-daemon"
           "gnome-control-center"
           "gnome-system-monitor"
           "gvfs"))))

(define gnome-desktop-service-type
  (service-type
   (name 'gnome-desktop)
   (extensions
    (list (service-extension polkit-service-type
                             gnome-polkit-settings)
          (service-extension profile-service-type
                             (compose list
                                      gnome-package))))
   (default-value (gnome-desktop-configuration))
   (description "Run the GNOME desktop environment.")))

(define-deprecated (gnome-desktop-service #:key (config
                                                 (gnome-desktop-configuration)))
  gnome-desktop-service-type
  "Return a service that adds the @code{gnome} package to the system profile,
and extends polkit with the actions from @code{gnome-settings-daemon}."
  (service gnome-desktop-service-type config))

;; MATE Desktop service.
;; TODO: Add mate-screensaver.

(define-record-type* <mate-desktop-configuration> mate-desktop-configuration
  make-mate-desktop-configuration
  mate-desktop-configuration?
  (mate-package mate-package (default mate)))

(define (mate-polkit-extension config)
  "Return the list of packages for CONFIG's MATE package that extend polkit."
  (let ((mate (mate-package config)))
    (map (lambda (input)
           ((package-direct-input-selector input) mate))
         '("mate-system-monitor"                  ;kill, renice processes
           "mate-settings-daemon"                 ;date/time settings
           "mate-power-manager"                   ;modify brightness
           "mate-control-center"                  ;RandR, display properties FIXME
           "mate-applets"))))                     ;CPU frequency scaling

(define mate-desktop-service-type
  (service-type
   (name 'mate-desktop)
   (extensions
    (list (service-extension polkit-service-type
                             mate-polkit-extension)
          (service-extension profile-service-type
                             (compose list
                                      mate-package))))
   (default-value (mate-desktop-configuration))
   (description "Run the MATE desktop environment.")))

(define-deprecated (mate-desktop-service #:key
                                         (config
                                          (mate-desktop-configuration)))
  mate-desktop-service-type
  "Return a service that adds the @code{mate} package to the system profile,
and extends polkit with the actions from @code{mate-settings-daemon}."
  (service mate-desktop-service-type config))


;;;
;;; XFCE desktop service.
;;;

(define-record-type* <xfce-desktop-configuration> xfce-desktop-configuration
  make-xfce-desktop-configuration
  xfce-desktop-configuration?
  (xfce xfce-package (default xfce)))

(define (xfce-polkit-settings config)
  "Return the list of XFCE dependencies that provide polkit actions and
rules."
  (let ((xfce (xfce-package config)))
    (map (lambda (name)
           ((package-direct-input-selector name) xfce))
         '("thunar"
           "xfce4-power-manager"))))

(define xfce-desktop-service-type
  (service-type
   (name 'xfce-desktop)
   (extensions
    (list (service-extension polkit-service-type
                             xfce-polkit-settings)
          (service-extension profile-service-type
                             (compose list xfce-package))))
   (default-value (xfce-desktop-configuration))
   (description "Run the Xfce desktop environment.")))

(define-deprecated (xfce-desktop-service #:key (config
                                                (xfce-desktop-configuration)))
  xfce-desktop-service-type
  "Return a service that adds the @code{xfce} package to the system profile,
and extends polkit with the ability for @code{thunar} to manipulate the file
system as root from within a user session, after the user has authenticated
with the administrator's password."
  (service xfce-desktop-service-type config))

+
;;;
;;; Lxqt desktop service.
;;;

(define-record-type* <lxqt-desktop-configuration> lxqt-desktop-configuration
  make-lxqt-desktop-configuration
  lxqt-desktop-configuration?
  (lxqt lxqt-package
        (default lxqt)))

(define (lxqt-polkit-settings config)
  "Return the list of LXQt dependencies that provide polkit actions and
rules."
  (let ((lxqt (lxqt-package config)))
    (map (lambda (name)
           ((package-direct-input-selector name) lxqt))
         '("lxqt-admin"))))

(define lxqt-desktop-service-type
  (service-type
   (name 'lxqt-desktop)
   (extensions
    (list (service-extension polkit-service-type
                             lxqt-polkit-settings)
          (service-extension profile-service-type
                             (compose list lxqt-package))))
   (default-value (lxqt-desktop-configuration))
   (description "Run LXQt desktop environment.")))


;;;
;;; X11 socket directory service
;;;

(define x11-socket-directory-service
  ;; Return a service that creates /tmp/.X11-unix.  When using X11, libxcb
  ;; takes care of creating that directory.  However, when using XWayland, we
  ;; need to create beforehand.  Thus, create it unconditionally here.
  (simple-service 'x11-socket-directory
                  activation-service-type
                  (with-imported-modules '((guix build utils))
                    #~(begin
                        (use-modules (guix build utils))
                        (let ((directory "/tmp/.X11-unix"))
                          (mkdir-p directory)
                          (chmod directory #o777))))))

;;;
;;; Enlightenment desktop service.
;;;

(define-record-type* <enlightenment-desktop-configuration>
  enlightenment-desktop-configuration make-enlightenment-desktop-configuration
  enlightenment-desktop-configuration?
  ;; <package>
  (enlightenment        enlightenment-package
                        (default enlightenment)))

(define (enlightenment-setuid-programs enlightenment-desktop-configuration)
  (match-record enlightenment-desktop-configuration
                <enlightenment-desktop-configuration>
                (enlightenment)
    (list (file-append enlightenment
                       "/lib/enlightenment/utils/enlightenment_sys")
          (file-append enlightenment
                       "/lib/enlightenment/utils/enlightenment_system")
          (file-append enlightenment
                       "/lib/enlightenment/utils/enlightenment_ckpasswd"))))

(define enlightenment-desktop-service-type
  (service-type
   (name 'enlightenment-desktop)
   (extensions
    (list (service-extension dbus-root-service-type
                             (compose list
                                      (package-direct-input-selector
                                       "efl")
                                      enlightenment-package))
          (service-extension setuid-program-service-type
                             enlightenment-setuid-programs)
          (service-extension profile-service-type
                             (compose list
                                      enlightenment-package))))
   (default-value (enlightenment-desktop-configuration))
   (description
    "Return a service that adds the @code{enlightenment} package to the system
profile, and extends dbus with the ability for @code{efl} to generate
thumbnails and makes setuid the programs which enlightenment needs to function
as expected.")))


;;;
;;; inputattach-service-type
;;;

(define-record-type* <inputattach-configuration>
  inputattach-configuration
  make-inputattach-configuration
  inputattach-configuration?
  (device-type inputattach-configuration-device-type
               (default "wacom"))
  (device inputattach-configuration-device
          (default "/dev/ttyS0"))
  (baud-rate inputattach-configuration-baud-rate
             (default #f))
  (log-file inputattach-configuration-log-file
            (default #f)))

(define inputattach-shepherd-service
  (match-lambda
    (($ <inputattach-configuration> type device baud-rate log-file)
     (let ((args (append (if baud-rate
                             (list "--baud" (number->string baud-rate))
                             '())
                         (list (string-append "--" type)
                               device))))
       (list (shepherd-service
              (provision '(inputattach))
              (requirement '(udev))
              (documentation "inputattach daemon")
              (start #~(make-forkexec-constructor
                        (cons (string-append #$inputattach
                                             "/bin/inputattach")
                              (quote #$args))
                        #:log-file #$log-file))
              (stop #~(make-kill-destructor))))))))

(define inputattach-service-type
  (service-type
   (name 'inputattach)
   (extensions
    (list (service-extension shepherd-root-service-type
                             inputattach-shepherd-service)))
   (default-value (inputattach-configuration))
   (description "Return a service that runs inputattach on a device and
dispatches events from it.")))


;;;
;;; gnome-keyring-service-type
;;;

(define-record-type* <gnome-keyring-configuration> gnome-keyring-configuration
  make-gnome-keyring-configuration
  gnome-keyring-configuration?
  (keyring gnome-keyring-package (default gnome-keyring))
  (pam-services gnome-keyring-pam-services (default '(("gdm-password" . login)
                                                      ("passwd" . passwd)))))

(define (pam-gnome-keyring config)
  (define (%pam-keyring-entry . arguments)
    (pam-entry
     (control "optional")
     (module (file-append (gnome-keyring-package config)
                          "/lib/security/pam_gnome_keyring.so"))
     (arguments arguments)))

  (list
   (lambda (service)
     (case (assoc-ref (gnome-keyring-pam-services config)
                      (pam-service-name service))
       ((login)
        (pam-service
         (inherit service)
         (auth (append (pam-service-auth service)
                       (list (%pam-keyring-entry))))
         (session (append (pam-service-session service)
                          (list (%pam-keyring-entry "auto_start"))))))
       ((passwd)
        (pam-service
         (inherit service)
         (password (append (pam-service-password service)
                           (list (%pam-keyring-entry))))))
       (else service)))))

(define gnome-keyring-service-type
  (service-type
   (name 'gnome-keyring)
   (extensions (list
                (service-extension pam-root-service-type pam-gnome-keyring)))
   (default-value (gnome-keyring-configuration))
   (description "Return a service, that adds the @code{gnome-keyring} package
to the system profile and extends PAM with entries using
@code{pam_gnome_keyring.so}, unlocking a user's login keyring when they log in
or setting its password with passwd.")))


;;;
;;; polkit-wheel-service -- Allow wheel group to perform admin actions
;;;

(define polkit-wheel
  (file-union
   "polkit-wheel"
   `(("share/polkit-1/rules.d/wheel.rules"
      ,(plain-file
        "wheel.rules"
        "polkit.addAdminRule(function(action, subject) {
    return [\"unix-group:wheel\"];
});
")))))

(define polkit-wheel-service
  (simple-service 'polkit-wheel polkit-service-type (list polkit-wheel)))


;;;
;;; The default set of desktop services.
;;;

(define %desktop-services
  ;; List of services typically useful for a "desktop" use case.
  (cons* (service gdm-service-type)

         ;; Screen lockers are a pretty useful thing and these are small.
         (screen-locker-service slock)
         (screen-locker-service xlockmore "xlock")

         ;; Add udev rules for MTP devices so that non-root users can access
         ;; them.
         (simple-service 'mtp udev-service-type (list libmtp))
         ;; Add udev rules for scanners.
         (service sane-service-type)
         ;; Add polkit rules, so that non-root users in the wheel group can
         ;; perform administrative tasks (similar to "sudo").
         polkit-wheel-service

         ;; Allow desktop users to also mount NTFS and NFS file systems
         ;; without root.
         (simple-service 'mount-setuid-helpers setuid-program-service-type
                         (list (file-append nfs-utils "/sbin/mount.nfs")
                               (file-append ntfs-3g "/sbin/mount.ntfs-3g")))

         ;; The global fontconfig cache directory can sometimes contain
         ;; stale entries, possibly referencing fonts that have been GC'd,
         ;; so mount it read-only.
         fontconfig-file-system-service

         ;; NetworkManager and its applet.
         (service network-manager-service-type)
         (service wpa-supplicant-service-type)    ;needed by NetworkManager
         (simple-service 'network-manager-applet
                         profile-service-type
                         (list network-manager-applet))
         (service modem-manager-service-type)
         (service usb-modeswitch-service-type)

         ;; The D-Bus clique.
         (service avahi-service-type)
         (udisks-service)
         (service upower-service-type)
         (accountsservice-service)
         (service cups-pk-helper-service-type)
         (service colord-service-type)
         (geoclue-service)
         (service polkit-service-type)
         (elogind-service)
         (dbus-service)

         (service ntp-service-type)

         x11-socket-directory-service

         (service pulseaudio-service-type)
         (service alsa-service-type)

         %base-services))

;;; desktop.scm ends here
