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authorLudovic Courtès <ludo@gnu.org>2019-11-01 23:48:40 +0100
committerLudovic Courtès <ludo@gnu.org>2019-11-02 00:12:19 +0100
commit27727b18b8597f7c6fd99adc7797c555aa1c92e9 (patch)
tree5b0e7a9375bd1aef0fed34d9aa2c89b9a64bf67d /gnu/services
parent33f9778bc83086837b99e5c5e99cd514cb0d154e (diff)
downloadguix-27727b18b8597f7c6fd99adc7797c555aa1c92e9.tar.gz
services: dbus: Remove non-existent directories from 'system-local.conf'.
This typically halves the number of entries in
/etc/dbus-1/system-local.conf.

* gnu/services/dbus.scm (dbus-configuration-directory)[build](directives):
New macro.
(services->sxml): Use it.
Diffstat (limited to 'gnu/services')
-rw-r--r--gnu/services/dbus.scm26
1 files changed, 20 insertions, 6 deletions
diff --git a/gnu/services/dbus.scm b/gnu/services/dbus.scm
index fcdeb3bf60..a697a8820e 100644
--- a/gnu/services/dbus.scm
+++ b/gnu/services/dbus.scm
@@ -86,6 +86,19 @@ includes the @code{etc/dbus-1/system.d} directories of each package listed in
         (use-modules (sxml simple)
                      (srfi srfi-1))
 
+        (define-syntax directives
+          (syntax-rules ()
+            ;; Expand the given directives (SXML expressions) only if their
+            ;; key names a file that exists.
+            ((_ (name directory) rest ...)
+             (let ((dir directory))
+               (if (file-exists? dir)
+                   `((name ,dir)
+                     ,@(directives rest ...))
+                   (directives rest ...))))
+            ((_)
+             '())))
+
         (define (services->sxml services)
           ;; Return the SXML 'includedir' clauses for DIRS.
           `(busconfig
@@ -98,12 +111,13 @@ includes the @code{etc/dbus-1/system.d} directories of each package listed in
             (servicedir "/etc/dbus-1/system-services")
 
             ,@(append-map (lambda (dir)
-                            `((includedir
-                               ,(string-append dir "/etc/dbus-1/system.d"))
-                              (includedir
-                               ,(string-append dir "/share/dbus-1/system.d"))
-                              (servicedir       ;for '.service' files
-                               ,(string-append dir "/share/dbus-1/services"))))
+                            (directives
+                             (includedir
+                              (string-append dir "/etc/dbus-1/system.d"))
+                             (includedir
+                              (string-append dir "/share/dbus-1/system.d"))
+                             (servicedir          ;for '.service' files
+                              (string-append dir "/share/dbus-1/services"))))
                           services)))
 
         (mkdir #$output)