services: Add Enlightenment desktop service.

* gnu/services/desktop.scm (<enlightenment-desktop-configuration>,
enlightenment-desktop-service-type): New variables.
* doc/guix.texi (Desktop Services): Document the service.
* NEWS: Mention it.

NEWS

@@ -11,6 +11,13 @@ Copyright © 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
 Please send Guix bug reports to bug-guix@gnu.org.
 
 * Changes in 0.15.0 (since 0.14.0)
+
+** Distribution
+
+*** New services
+
+enlightenment
+
 ** Programming interfaces
 
 *** package-full-name (guix packages) now uses "@" as its delimiter.

doc/guix.texi

@@ -12678,11 +12678,11 @@ 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}
+@code{xfce-desktop-service}, @code{mate-desktop-service} and
-procedures can add GNOME, XFCE and/or MATE to a system.
+@code{enlightenment-desktop-service-type} procedures can add GNOME, XFCE, MATE
-To ``add GNOME'' means that system-level services like the
+and/or Enlightenment to a system.  To ``add GNOME'' means that system-level
-backlight adjustment helpers and the power management utilities are
+services like the backlight adjustment helpers and the power management
-added to the system, extending @code{polkit} and @code{dbus}
+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
@@ -12695,7 +12695,10 @@ To ``add MATE'' means that @code{polkit} and @code{dbus} are extended
 appropriately, allowing MATE to operate with elevated privileges on a
 limited number of special-purpose system interfaces.  Additionally,
 adding a service made by @code{mate-desktop-service} adds the MATE
-metapackage to the system profile.
+metapackage to the system profile.  ``Adding ENLIGHTENMENT'' means that
+@code{dbus} is extended appropriately, and several of Enlightenment's binaries
+are set as setuid, allowing Enlightenment's screen locker and other
+functionality to work as expetected.
 
 The desktop environments in Guix use the Xorg display server by
 default.  If you'd like to use the newer display server protocol
@@ -12725,6 +12728,18 @@ profile, and extends polkit with the actions from
 @code{mate-settings-daemon}.
 @end deffn
 
+@deffn {Scheme Procedure} enlightenment-desktop-service-type
+Return a service that adds the @code{enlightenment} package to the system
+profile, and extends dbus with actions from @code{efl}.
+@end deffn
+
+@deftp {Data Type} enlightenment-desktop-service-configuration
+@table @asis
+@item @code{enlightenment} (default @code{enlightenment})
+The enlightenment package to use.
+@end table
+@end deftp
+
 Because the GNOME, XFCE and MATE desktop services pull in so many packages,
 the default @code{%desktop-services} variable doesn't include any of
 them by default.  To add GNOME, XFCE or MATE, just @code{cons} them onto

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.
 ;;;
@@ -32,6 +33,7 @@ (define-module (gnu services desktop)
   #:use-module (gnu services sound)
   #: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)
@@ -45,9 +47,11 @@ (define-module (gnu services desktop)
   #: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)
@@ -97,6 +101,10 @@ (define-module (gnu services desktop)
 
             x11-socket-directory-service
 
+            enlightenment-desktop-configuration
+            enlightenment-desktop-configuration?
+            enlightenment-desktop-service-type
+
             %desktop-services))
 
 ;;; Commentary:
@@ -900,6 +908,60 @@ (define x11-socket-directory-service
                         (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_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/"
+                         (match (string-tokenize (%current-system)
+                                                 (char-set-complement (char-set #\-)))
+                                ((arch "linux") (string-append "linux-gnu-" arch))
+                                ((arch "gnu")   (string-append "gnu-" arch)))
+                         "-"
+                         (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))))
+   (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.")))
 
 
 ;;;