services: plasma: Add dbus settings.

* gnu/services/desktop.scm (plasma-dbus-service): New procedure.
(plasma-desktop-service-type)[extensions]: Add It.

* gnu/packages/kde-plasma.scm (plasma-workspace)[arguments]: Add
remove-dbus-service phase.

Change-Id: Iadadbff7183bc4655e4cb9bc28cd85df19511949

gnu/packages/kde-plasma.scm

@@ -2909,7 +2909,15 @@ (define-public plasma-workspace
 locationsrunnertest|testimagefinder|testimagelistmodel|\
 testpackageimagelistmodel|testimageproxymodel|testslidemodel|testimagefrontend|\
 dbusservicewatchertest|klippertest|keystatetest|lockedtest|tst_triangleFilter|\
-testimagebackend)")))))))
+testimagebackend)"))))
+               ;; share/dbus-1/system-services have same name file
+               ;; when dbus-root-service-type merge it, wail report
+               ;; "file exists".
+               (add-after 'install 'remove-dbus-service
+                 (lambda _
+                   (delete-file
+                    (string-append
+                     #$output "/share/dbus-1/services/org.kde.fontinst.service")))))))
     (home-page "https://invent.kde.org/plasma/plasma-workspace")
     (synopsis "Plasma workspace components")
     (description

gnu/services/desktop.scm

@@ -1785,6 +1785,21 @@ (define (plasma-polkit-settings config)
            "powerdevil"
            "plasma-firewall"))))
 
+(define (plasma-dbus-service config)
+  "Return the list of KDE Plasma dependencies that provide D-Bus services."
+  (let ((plasma-plasma (plasma-package config)))
+    (map (lambda (name)
+           ((package-direct-input-selector name) plasma-plasma))
+         '("plasma-desktop"
+           "plasma-workspace"
+           "kactivitymanagerd"
+           "plasma-disks"
+           "kinfocenter"
+           "libksysguard"
+           "ktexteditor"
+           "powerdevil"
+           "plasma-firewall"))))
+
 ;; see https://bugs.kde.org/show_bug.cgi?id=456210
 ;; if `kde' no exits, fallback to `other', and then unlock lockscreen not work,
 ;; so add it.
@@ -1799,6 +1814,8 @@ (define plasma-desktop-service-type
    (extensions
     (list (service-extension polkit-service-type
                              plasma-polkit-settings)
+          (service-extension dbus-root-service-type
+                             plasma-dbus-service)
           (service-extension pam-root-service-type
                              plasma-pam-services)
           (service-extension profile-service-type