Hi all ,
I have just investigated on the following question :
/But are we sure we don't need to support multiple sessions per user? //
///
Here is my results:
* First,
Following DBUS Documentation,
There is only 1 dbus session per user login.
"The other instances are created one per user login session. These
instances allow applications in the user's session to communicate with
one another. "
> http://dbus.freedesktop.org/doc/dbus-tutorial.html
So DBUS is designed to get only 1 dbus session per USER.
* Second,
For Deamons there are two ways to get session adress:
by getting DBUS_SESSION environment variable (used if it an abstract
socket =>
DBUS_SESSION_BUS_ADDRESS=unix:abstract=/tmp/dbus-Dav2MOo24R,guid=39d30047a4517965af8bc05b5257b029
)
by knowning the dbus adress : this is the case in tizen: each user have
a dbus session socket stored : /run/<User>...
* Finally, *the dbus service system (/usr/share/dbus-1/services/)
should be hard to manage*, because this system allow to launch an
app that provides a specific dbus interface when a process request
it, througth the dbus session.
In my opinion, it is probably *"*not" a good idea to get multiples dbus
sesssion per user login.
Regards,
Baptiste DURAND
Le 16/10/2013 11:59, Jussi Laako a écrit :
On 16.10.2013 12:41, Patrick Ohly wrote:
This might not be the case for this particular example: on the IVI image
using the systemd user session management, the session D-Bus socket
address is hard-coded per user. Initially, systemd listens on that
address and then starts the dbus-daemon on demand when a client tries to
connect to D-Bus via that socket.
OK, on openSUSE (also using systemd) that is the case only for system
bus. Session bus still runs with "dbus-daemon --fork --print-address
--session" and has random dbus session bus address.
Fixed per user address may become tricky in case there are more than
one user session per userid.
With our current plan, there would be a separate guest user per seat
so it shouldn't become an issue. But are we sure we don't need to
support multiple sessions per user?
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