On Mon, 13 Sep 2021 at 22:59:32 +0200, Aurelien Jarno wrote:
> - running the operation on a non-existing user, but as loginctl does a
> check that the user exists, it has to be done directly with the dbus
> API, for instance "gdbus call --system --dest org.freedesktop.login1
> --object-path /org/freedesktop/login1 --method
> org.freedesktop.login1.Manager.SetUserLinger 12345678 true true"
>
> The latest is more a bit more complex to do (especially that
> libglib2.0-bin is not necessarily installed on the system), but has the
> advantage of exercising all configured NSS modules.
systemd happens to have its own D-Bus implementation sd-bus (a competitor
to libdbus and GLib's GDBus) for which it provides busctl(1), an
equivalent of gdbus(1) and dbus-send(1). So this could be written as:
busctl call --system org.freedesktop.login1 /org/freedesktop/login1 \
org.freedesktop.login1.Manager SetUserLinger ubb $uid true true
which does not have dependencies outside systemd.deb.
The nonexistent uid should probably be in one of the ranges reserved by
Policy ยง9.2.2: perhaps 4294967294 or (uint32_t) -2, which is reserved
as a representation of the anonymous NFS user?
smcv
