test: make sure the dbus daemon is available before starting the test suite

On CircleCI, the builds fail one over four times because we are launching
the testsuite while ratbagd.devel is still not ready.

Do a basic polling after we launch the daemon so that we are aware when
the ratbagd daemon is ready.

A proper solution would be to use "new" for querying the proxy, not
"new_sync". However, this would require us to have a GTK mainloop
running, so it's a PITA.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>

tools/ratbagctl.test.in

@@ -547,6 +547,9 @@ class TestRatbgagCtlLED(TestRatbagCtl):
 
 
 def setUpModule():
+    from gi.repository import Gio
+    import time
+
     global ratbagd_process, ratbagd, parser
     # first copy the policy for the ratbagd daemon to be allowed to run
     shutil.copy(os.path.join('@MESON_BUILD_ROOT@', DBUS_CONF_NAME), DBUS_CONF_PATH)
@@ -555,6 +558,22 @@ def setUpModule():
 
     ratbagd_process = subprocess.Popen([os.path.join('@MESON_BUILD_ROOT@', "ratbagd.devel")], shell=False)
 
+    dbus = Gio.bus_get_sync(Gio.BusType.SYSTEM, None)
+
+    name_owner = None
+    start_time = time.clock()
+    while name_owner is None and time.clock() - start_time < 30:
+        proxy = Gio.DBusProxy.new_sync(dbus,
+                                       Gio.DBusProxyFlags.NONE,
+                                       None,
+                                       "org.freedesktop.ratbag_devel1_@ratbagd_sha@",
+                                       "/org/freedesktop/ratbag_devel1_@ratbagd_sha@",
+                                       "org.freedesktop.ratbag_devel1_@ratbagd_sha@.Manager",
+                                       None)
+        name_owner = proxy.get_name_owner()
+        if name_owner is None:
+            time.sleep(0.2)
+
     os.environ['RATBAGCTL_DEVEL'] = "org.freedesktop.ratbag_devel1_@ratbagd_sha@"
 
     ratbagd = ratbagctl.open_ratbagd()