Starting DBus from gnome-session instead of Xsession

[Loïc Minier <lool+debian@via.ecp.fr>]

        Hi,

 The session DBus in Debian Xsessions is currently started by
 /etc/X11/Xsession.d/75dbus_dbus-launch if the use-session-dbus option
 is set.

 Newer gnome-session will spawn a session DBus automatically if none has
 been started.

 If gnome-session launches DBus, DBus will inherit env from
 gnome-session which is handy for gnome-keyring for example.

 I suspect we wouldn't suffer from the sound issues (the desktop sounds
 are not working bugs) would we be moving to launch DBus from
 gnome-session, and I think this is what we should aim to do.


 I personally think it makes a lot of sense to launch DBus from
 gnome-session; what I wonder about is how we're going to switch to this
 setup.
   Ubuntu plans to fix this via a patch to the dbus Xsession snippet to
 avoid starting DBus when running GNOME session; see Ubuntu #62163 and
 <http://librarian.launchpad.net/7170382/dbus_1.0.2-1ubuntu34.patch>.
   It's not trivial to know whether we're really in a GNOME session
 because:
 - from the PoV of gdm, there are a couple of GNOME sessions, and the
   "Default" session, which will launch x-session-manager which might or
   might not gnome-session
 - sessions can be started via startx and/or various other ways


 Note: there's currently an upstream bug that gnome-session does not
 wait on DBus enough; see GNOME bug #395488.

-- 
Loïc Minier