Comment # 8 on bug 1128835 from Hans Petter Jansson

gnome-terminal used to have a --disable-factory flag that let you start it up
directly in your process tree, but alas, it was removed.

To save some time I'm copying part of Lennart's conclusion from the thread
here:

https://lists.freedesktop.org/archives/systemd-devel/2019-June/042936.html

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So, I think you found most of this out already, but the "session"
keyring concept is not particularly useful in today's world where
desktops run with a per-user systemd instance of which most apps are
forked off. Just don't bother with session keyrings besides ensuring
they are propery created. Make sure that every PAM session comes with
pam_keyinit configured, so that they all get their own keyring
properly hooked up (and that includes the PAM session systemd --user
runs as) but other then that, don't make use of it, as it makes no
sense in a world where every session of the same user shares the same
service manager that does not inherit process attributes from the
user's original login session.

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Franck: As a matter of design, does that work for us? If so, I suggest we close
this.