On Mon, 2021-03-29 at 10:07 +0200, Leo Prikler wrote:
> [...]
> 
> In a similar manner, if I see an Emacs version upgrade at the start of
> the transaction, I already know to prepare for a little environment
> variable dance to get it to start correctly.  I think there has been an
> idea to update environment variables in GNOME Shell directly, for
> instance, but
> a. we're lacking the technology to do so at the moment (e.g. guile-
> dbus)

Actually, we do have dbus bindings for guile (actually, a reimplementation
of dbus in (Guile) Scheme): guile-ac-d-bus.  It doesn't support file descriptor
passing (at least on Guile, other Schemes may differ) though, but that's
probably not required for this.

Greetings,
Maxime.