HAL virtualization (was Re: dbus: api or implementation detail)

[Artem Kachitchkine]

> DBUS_SESSION_BUS_ADDRESS variable, which the
> apps have to set - which breaks R1, because all current applications use
> the system bus.
> 
> If there was a library on top of hald, that library would do token ->
> DBUS_SESSION_BUS_ADDRESS mapping transparently, say in libhal_ctx_init().

I've missed the fact that DBUS_SESSION_BUS_ADDRESS is set at login time, 
so there's no need for the apps to set it. But they would need to set 
D-BUS type SESSION instead of SYSTEM, so the issue remains.

In absense of an ideal solution, I suppose we could relax R1 and allow a 
simple code change in applications: if a token is present, use SESSION 
dbus type; otherwise use SYSTEM...

-Artem.
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