Fix fail to enable bluetooth issue

When launch blueman-manager while bluetooth is disable, it may fails
with error:

  Failed to enable bluetooth

Because when get bluetooth status right after change its status, the
status may not be updated that plugin applet/KillSwitch.py sets the
bluetooth status via method of another dbus service which doesn't return
immediately.

Provides a new dbus method for PowerManager which checks whether dbus
method SetBluetoothStatus() has finished. Then it makes sure to get
right bluetooth status.

Upstream-Status: Inappropriate
Send to upstream but not accepted:
https://github.com/blueman-project/blueman/pull/1121

Signed-off-by: Kai Kang <kai.kang@windriver.com>
---
 blueman/Functions.py                   | 10 ++++++++++
 blueman/plugins/applet/PowerManager.py |  4 ++++
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/blueman/Functions.py b/blueman/Functions.py
index 3b76271..c5eeb27 100644
--- a/blueman/Functions.py
+++ b/blueman/Functions.py
@@ -86,6 +86,16 @@ def check_bluetooth_status(message, exitfunc):
             return
 
     applet.SetBluetoothStatus('(b)', True)
+
+    timeout = time.time() + 10
+    while applet.GetRequestStatus():
+        time.sleep(0.1)
+        if time.time() > timeout:
+            # timeout 5s has been set in applet/PowerManager.py
+            # so it should NOT reach timeout here
+            logging.warning('Should NOT reach timeout.')
+            break
+
     if not applet.GetBluetoothStatus():
         print('Failed to enable bluetooth')
         exitfunc()
diff --git a/blueman/plugins/applet/PowerManager.py b/blueman/plugins/applet/PowerManager.py
index 8ec9fc4..29a0fb0 100644
--- a/blueman/plugins/applet/PowerManager.py
+++ b/blueman/plugins/applet/PowerManager.py
@@ -48,6 +48,7 @@ class PowerManager(AppletPlugin):
         self._add_dbus_signal("BluetoothStatusChanged", "b")
         self._add_dbus_method("SetBluetoothStatus", ("b",), "", self.request_power_state)
         self._add_dbus_method("GetBluetoothStatus", (), "b", self.get_bluetooth_status)
+        self._add_dbus_method("GetRequestStatus", (), "b", self.get_request_status)
 
     def on_unload(self):
         self.parent.Plugins.Menu.unregister(self)
@@ -182,6 +183,9 @@ class PowerManager(AppletPlugin):
     def get_bluetooth_status(self):
         return self.current_state
 
+    def get_request_status(self):
+        return self.request_in_progress
+
     def on_adapter_property_changed(self, _path, key, value):
         if key == "Powered":
             if value and not self.current_state:
-- 
2.20.1