[gcr/meson-stuff: 3/6] meson: Install DBus services in the correct prefix

[Niels De Graef <nielsdg src gnome org>]

commit c16f69a98d3cfa52eae7f650cd2adfe95f5dea87
Author: Niels De Graef <nielsdegraef gmail com>
Date:   Sun Jun 12 23:23:49 2022 +0200

    meson: Install DBus services in the correct prefix
    
    We should use the pkg-config variable of the `dbus-1` package to check
    where we should install our D-Bus services, but we also need to make
    sure we don't pollute anything outside of $prefix, so make sure to get
    that case as well.

 gcr/meson.build | 2 +-
 meson.build     | 9 +++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)
---
diff --git a/gcr/meson.build b/gcr/meson.build
index 745dade3..88428eed 100644
--- a/gcr/meson.build
+++ b/gcr/meson.build
@@ -311,7 +311,7 @@ foreach service_file : gcr_service_files
     configuration: {
       'libexecdir': gcr_prefix / get_option('libexecdir'),
     },
-    install_dir: get_option('datadir') / 'dbus-1' / 'services',
+    install_dir: dbus_services_dir,
   )
 endforeach
 
diff --git a/meson.build b/meson.build
index c3d9ba38..a1e08822 100644
--- a/meson.build
+++ b/meson.build
@@ -73,6 +73,15 @@ if libsystemd.found() and systemd.found()
   with_systemd = true
 endif
 
+dbus_dep = dependency('dbus-1', required: false)
+if dbus_dep.found()
+  dbus_services_dir = dbus_dep.get_variable('session_bus_services_dir',
+    pkgconfig_define: [ 'datadir', get_option('datadir') ],
+  )
+else
+  dbus_services_dir = get_option('datadir') / 'dbus-1' / 'services'
+endif
+
 if get_option('gtk3')
   gtk3_min_version = '3.22'
   gtk3_dep = dependency('gtk+-3.0', version: '>=' + gtk3_min_version)