cs_power.py: Discover suspend/hibernate capabilities from cinnamon-

session.

This is what our logout dialog uses, and the capabilities should
match. The session manager is already checking with the active
login manager (systemd or consolekit).

Ref:
#13219

Author: mtwebster

files/usr/share/cinnamon/cinnamon-settings/modules/cs_power.py

@@ -148,7 +148,7 @@ def on_module_selected(self):
 
         section = power_page.add_section(_("Power options"))
 
-        lid_options, button_power_options, critical_options, can_suspend, can_hybrid_sleep, can_hibernate = get_available_options(self.up_client)
+        lid_options, button_power_options, critical_options, can_suspend, can_hybrid_sleep, can_hibernate = get_available_options()
 
         size_group = Gtk.SizeGroup(mode=Gtk.SizeGroupMode.HORIZONTAL)
 
@@ -577,44 +577,23 @@ def on_alias_changed(self, entry, event, device_id):
         self.settings.set_strv("device-aliases", aliases)
 
 
-def get_available_options(up_client):
+def get_available_options():
     can_suspend = False
     can_hibernate = False
     can_hybrid_sleep = False
 
-    # Try logind first
+    # There's no reason this should ever fail as a normal user
     try:
-        connection = Gio.bus_get_sync(Gio.BusType.SYSTEM, None)
-        proxy = Gio.DBusProxy.new_sync(
-            connection,
-            Gio.DBusProxyFlags.NONE,
-            None,
-            "org.freedesktop.login1",
-            "/org/freedesktop/login1",
-            "org.freedesktop.login1.Manager",
-            None)
-
-        can_suspend = proxy.CanSuspend() == "yes"
-        can_hibernate = proxy.CanHibernate() == "yes"
-        can_hybrid_sleep = proxy.CanHybridSleep() == "yes"
-    except:
-        pass
-
-    # Next try ConsoleKit
-    try:
-        connection = Gio.bus_get_sync(Gio.BusType.SYSTEM, None)
-        proxy = Gio.DBusProxy.new_sync(
-            connection,
-            Gio.DBusProxyFlags.NONE,
-            None,
-            "org.freedesktop.ConsoleKit",
-            "/org/freedesktop/ConsoleKit/Manager",
-            "org.freedesktop.ConsoleKit.Manager",
-            None)
-
-        can_suspend = can_suspend or (proxy.CanSuspend() == "yes")
-        can_hibernate = can_hibernate or (proxy.CanHybridSleep() == "yes")
-        can_hybrid_sleep = can_hybrid_sleep or (proxy.CanHybridSleep() == "yes")
+        proxy = Gio.DBusProxy.new_for_bus_sync(
+                    Gio.BusType.SESSION,
+                    Gio.DBusProxyFlags.NONE,
+                    None,
+                    "org.gnome.SessionManager",
+                    "/org/gnome/SessionManager",
+                    "org.cinnamon.SessionManager.EndSessionDialog",
+                    None)
+
+        __, __, __, can_hybrid_sleep, can_suspend, can_hibernate, __ = proxy.GetCapabilities()
     except:
         pass