[bug#68716] [PATCH v5 5/8] services: Extend polkit capabilities of gnome-desktop-service.

[Liliana Marie Prikler <liliana.prikler@gmail.com>]

As with our udev extension, this makes it so that all inputs are considered
modulo a new ignorelist.

* gnu/services/desktop.scm (gnome-desktop-configuration): Add
polkit-ignorelist.
(gnome-polkit-settings): Adjust accordingly.
---
 gnu/services/desktop.scm | 44 ++++++++++++++++++++++++----------------
 1 file changed, 27 insertions(+), 17 deletions(-)

diff --git a/gnu/services/desktop.scm b/gnu/services/desktop.scm
index 0631571c49..b3c0f4fc41 100644
--- a/gnu/services/desktop.scm
+++ b/gnu/services/desktop.scm
@@ -1425,7 +1425,12 @@ (define-configuration/no-serialization gnome-desktop-configuration
    "A list of regular expressions denoting udev rules or hardware file names
 provided by any package that should not be installed.  By default, every udev
 rule and hardware file specified by any package referenced in the other fields
-are installed."))
+are installed.")
+  (polkit-ignorelist
+   (list-of-strings '())
+   "A list of regular expressions denoting polkit rules provided by any package
+that should not be installed.  By default, every polkit rule added by any package
+referenced in the other fields are installed."))
 
 (define (gnome-package gnome name)
   "Return the package NAME among the GNOME package inputs.  NAME can be a
@@ -1467,22 +1472,27 @@ (define (gnome-udev-configuration-files config)
 (define (gnome-polkit-settings config)
   "Return the list of GNOME dependencies that provide polkit actions and
 rules."
-  (let ((gnome (gnome-desktop-configuration-gnome config))
-        (shell (gnome-desktop-configuration-shell config)))
-    (or (any (match-lambda ((and pkg (= package-name "gvfs")) (list pkg))
-                           (_ #f))
-              shell)
-        (and (maybe-value-set? gnome)
-             (gnome-packages gnome
-                             '("gnome-settings-daemon"
-                               "gnome-control-center"
-                               "gnome-system-monitor"
-                               "gvfs")))
-        (raise
-         (condition
-          (&error-location
-           (location (gnome-desktop-configuration-source-location config)))
-          (&message (message (G_ "Missing gvfs"))))))))
+  (list
+   (computed-file
+    "gnome-polkit-settings"
+    (with-imported-modules
+        (source-module-closure '((guix build utils)
+                                 (guix build union)))
+      #~(let ((output (string-append #$output "/share/polkit-1")))
+          (use-modules (guix build utils)
+                       (guix build union))
+          (mkdir-p (dirname output))
+          (union-build output
+                       (search-path-as-list
+                        (list "share/polkit-1")
+                        (list #$@(gnome-profile config)))
+                       #:create-all-directories? #t)
+          (for-each
+           (lambda (pattern)
+             (for-each
+              delete-file-recursively
+              (find-files output pattern)))
+           (list #$@(gnome-desktop-configuration-polkit-ignorelist config))))))))
 
 (define (gnome-profile config)
   "Return a list of packages propagated through CONFIG."
-- 
2.41.0