[bug#31342] [PATCH 2/2] gnu: services: Add Enlightenment desktop service.

[Efraim Flashner <efraim@flashner.co.il>]

* gnu/services/desktop.scm (<enlightenment-desktop-configuration>,
enlightenment-desktop-service-type): New variables.
(enlightenment-desktop-service): New public variable.
* doc/guix.texi (Desktop Services): Document the service.
---
 doc/guix.texi            | 10 +++----
 gnu/services/desktop.scm | 61 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 66 insertions(+), 5 deletions(-)

diff --git a/doc/guix.texi b/doc/guix.texi
index dc9894173..4fd3464ad 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -12584,11 +12584,11 @@ field of an @code{operating-system} declaration (@pxref{operating-system
 Reference, @code{services}}).
 
 Additionally, the @code{gnome-desktop-service},
-@code{xfce-desktop-service} and @code{mate-desktop-service}
-procedures can add GNOME, XFCE and/or MATE to a system.
-To ``add GNOME'' means that system-level services like the
-backlight adjustment helpers and the power management utilities are
-added to the system, extending @code{polkit} and @code{dbus}
+@code{xfce-desktop-service}, @code{mate-desktop-service} and
+@code{enlightenment-desktop-service} procedures can add GNOME, XFCE, MATE
+and/or Enlightenment to a system.  To ``add GNOME'' means that system-level
+services like the backlight adjustment helpers and the power management
+utilities are added to the system, extending @code{polkit} and @code{dbus}
 appropriately, allowing GNOME to operate with elevated privileges on a
 limited number of special-purpose system interfaces.  Additionally,
 adding a service made by @code{gnome-desktop-service} adds the GNOME
diff --git a/gnu/services/desktop.scm b/gnu/services/desktop.scm
index 517d5d3ef..605d06c23 100644
--- a/gnu/services/desktop.scm
+++ b/gnu/services/desktop.scm
@@ -5,6 +5,7 @@
 ;;; Copyright © 2016 Sou Bunnbu <iyzsong@gmail.com>
 ;;; Copyright © 2017 Maxim Cournoyer <maxim.cournoyer@gmail.com>
 ;;; Copyright © 2017 Nils Gillmann <ng0@n0.is>
+;;; Copyright © 2018 Efraim Flashner <efraim@flashner.co.il>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -31,6 +32,7 @@
   #:use-module (gnu services networking)
   #:use-module ((gnu system file-systems)
                 #:select (%elogind-file-systems))
+  #:use-module (gnu system)
   #:use-module (gnu system shadow)
   #:use-module (gnu system pam)
   #:use-module (gnu packages glib)
@@ -44,9 +46,11 @@
   #:use-module (gnu packages linux)
   #:use-module (gnu packages libusb)
   #:use-module (gnu packages mate)
+  #:use-module (gnu packages enlightenment)
   #: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)
@@ -96,6 +100,11 @@
 
             x11-socket-directory-service
 
+            enlightenment-desktop-configuration
+            enlightenment-desktop-configuration?
+            enlightenment-desktop-service
+            enlightenment-desktop-service-type
+
             %desktop-services))
 
 ;;; Commentary:
@@ -899,6 +908,58 @@ with the administrator's password."
                         (let ((directory "/tmp/.X11-unix"))
                           (mkdir-p directory)
                           (chmod directory #o777))))))
+\f
+;;;
+;;; Enlightenment desktop service.
+;;;
+
+(define-record-type* <enlightenment-desktop-configuration>
+  enlightenment-desktop-configuration
+  make-enlightenment-desktop-configuration
+  enlightenment-desktop-configuration
+  (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_backlight")
+          ;; TODO: Move this binary to a screen-locker service.
+          (file-append enlightenment
+                       "/lib/enlightenment/utils/enlightenment_ckpasswd")
+          (file-append enlightenment
+                       (string-append
+                         "/lib/enlightenment/modules/cpufreq/linux-gnu-"
+                         (string-drop-right (%current-system) 6) ; drop '-linux'
+                         "-"
+                         (version-major+minor (package-version enlightenment))
+                         "/freqset")))))
+
+(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))))))
+
+(define* (enlightenment-desktop-service
+           #:key (config (enlightenment-desktop-configuration)))
+  "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 expects to have
+their setuid bit set."
+  (service enlightenment-desktop-service-type config))
 
 \f
 ;;;
-- 
2.17.0