[patch] Auto session bus launch from libdbus, take 2

[Havoc Pennington]

John (J5) Palmieri wrote:
> looks good to me
> 

The additional work for 1.0 would be:
  - run this in %post of rpms
  - make dbus-launch use it instead of hostnames in thiago's patch

There is one feature this enables other than the autolaunch, which is 
dbus_connections_on_same_machine(DBusConnection *connection,
                                  DBusConnection *other);
or
dbus_connection_on_local_machine (DBusConnection *connection);

But probably don't want to add that API for 1.0.

An issue I'm unsure how to resolve is that if we run this on "make 
install" then it will overwrite an existing machine id, which is not 
desirable. But if we don't do anything on "make install" tarball 
installs will be wonky out of the box.

A possible answer is to have make install do a 'dbus-uuidgen 
--ensure=installfile' instead of just creating the uuid in the build 
tree and then installing it like any other file.

Anyway, the key question I think is whether the %post changes and change 
to dbus-launch can/should be done.

Havoc