On Fri, Dec 2, 2016 at 10:39 AM, Mantas Mikulėnas <graw...@gmail.com> wrote:
> On Fri, Dec 2, 2016 at 10:28 AM, Mohan R <mohan...@gmail.com> wrote: > >> Hi, >> >> I'm working on a display-manager for a multiseat environment. Here is how >> we use logind >> >> 1. create new seat through udev >> 2. we set the XDG_SEAT in pamenv before calling pam_open_session() >> 3. we take XDG_SESSION_ID, XDG_RUNTIME_DIR and DBUS_SESSION_BUS_ADDRESS >> from pam_systemd >> >> Let say if a user already have a session(session0) in a seat >> (customseat0) and he want to start another session in another seat >> (customseat1). Our display manager would get the same >> DBUS_SESSION_BUS_ADDRESS from pam_systemd for session1. >> >> As we cannot use the same address for two sessions, we have to start >> dbus-session manually. Using the address provided by dbus-session as >> DBUS_SESSION_BUS_ADDRESS, we then proceed with starting gnome-keyring and >> gnome-session. >> >> Problem is, processes forked by 'systemd --user' will have >> DBUS_SESSION_BUS_ADDRESS="unix:path=$XDG_RUNTIME_DIR/bus" but processes >> forked by gnome-session will have DBUS_SESSION_BUS_ADDRESS=$DBUS >> _SESSION_PROVIDED_ADDRESS. >> >> Is there any way to make pam_systemd provides uniq >> DBUS_SESSION_BUS_ADDRESS for every session (may be >> unix:path=$XDG_RUNTIME_DIR/$XDG_SESSION_ID/bus)? or is there any way to >> ask 'systemd --user' to provide different DBUS_SESSION_BUS_ADDRESS to the >> childs? >> > > No, only one graphical session at a time is supported. While you can start > additional sessions using `dbus-run-session` or the old `dbus-launch` (and > have them run independently, "traditional way"), systemd --user will only > ever use the main user bus. > > Also, if you made systemd specify different bus envvars for different > services, you wouldn't be able to start the same service for *both* > sessions at once... > > (*Technically,* I suppose it would be possible to make logind start > per-session instances of --user and so on and so on, but as it is nothing > like that is supported.) > > -- > Mantas Mikulėnas <graw...@gmail.com> > (to clarify, the "1 graphical session" limitation is course per-user, not system-wide) -- Mantas Mikulėnas <graw...@gmail.com>
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