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dbus - user vs system session

systemctl status dbus

vs

systemctl --user status dbus

Which one is better? Or which one is less of an issue? Any difference?

Intuition would tell that a systemd user service with dbus is slightly less worse than a systemd system services with dbus. However, auote https://packages.debian.org/buster/dbus-user-session:

D-Bus is a message bus, used for sending messages between applications. Conceptually, it fits somewhere in between raw sockets and CORBA in terms of complexity.

On systemd systems, this package opts in to the session model in which a user’s session starts the first time they log in, and does not end until all their login sessions have ended. This model merges all parallel non-graphical login sessions (text mode, ssh, cron, etc.), and up to one graphical session, into a single “user-session” or “super-session” within which all background D-Bus services are shared.

Multiple graphical sessions per user are not currently supported in this mode; as a result, it is particularly suitable for gdm, which responds to requests to open a parallel graphical session by switching to the existing graphical session and unlocking it.

To retain dbus’ traditional session semantics, in which login sessions are artificially isolated from each other, remove this package and install dbus-x11 instead.

See the dbus package description for more information about D-Bus in general.

Would it be good of bad to have package dbus-user-session installed?

Background why I stumbled on this: got an issue while working on constrained system resources program starter wrapper as workaround to applications using too much system resources freezing the whole system. Related:

dbus-user-session is already installed by default in Non-Qubes-Whonix as part of a dependency of another package. Not yet installed by default in Qubes-Whonix.

I think --user is a de-privileged way to interact with dbus which is better for security, but you can run into problems with XDG RUNTIME

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