[Pkg-utopia-maintainers] Bug#495257: dbus: System bus must not be restarted during package upgrades

[Tyson Clugg]

First up, I'm not a DBus daemon developer.

I disagree that the DBus daemon should never be restarted because the
NetworkManager developers say so.  This is a step towards the "dark
side" - rebooting your box after performing an upgrade is the M$ way of
doing things.  Solid engineering can prevent this.

I have no idea if the following is possible, but it may be a good start
to solving the DBus upgrade/restart puzzle:

1. Start new DBus daemon on a new socket:
     /var/run/dbus/system_bus_socket.new

2. Connect to the old socket and start proxying messages between the 2
daemons.

3. Move the new socket over the top of the old socket:

mv /var/run/dbus/system_bus_socket.new /var/run/dbus/system_bus_socket

4. Send message to the old daemon to force disconnection of all clients
which should reconnect to the new daemon, once all clients disconnected
then the old daemon shuts down.

Comments?

-- 
Regards

Tyson Clugg
Programmer
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