[LightDM] lightdm support for specifying list of users to be SHOWN in greeter?

[Robert Ancell]

Hi Rob,

The LightDM daemon only provides a hint to the greeters if users should be
displayed or not. It is up to each greeter to decide if wants to show a
subset of users. Unity Greeter provides an option to hide users. The GTK+
greeter doesn't provide an option. I'm not sure what the KDE greeters
provide.

We could add a user whitelist to the LightDM configuration and let the
greeters use that or you could just implement it in each greeter as
appropriate. Note that LightDM just provides hints to each greeter so the
feature would still need to be implemented in each greeter (though we would
probably add a helper function in liblightdm).

If you think the feature should be provided by LightDM please file a bug
here: https://bugs.launchpad.net/lightdm

On Tue, 14 Jul 2015 at 05:06 <robert.devanna at nospammail.net> wrote:

>
> Hi,
>
> I'm upgrading to KDE 'Next Gen' (plasma5 + KF5* + etc ).
>
> With this change, the default greeter switches from KDM to SDDM; tho, KDM
> still works -- for now.
>
> KDM's had the option -- for ages -- to specify a list of
> non-continugous-UID users to show in the greeter.
>
> So, e.g.
>
>   ShowUsers=0,1000,1001
>
> or
>
>   ShowUsers=1000,1006
>
> Afaict, lightdm's and sddm's greeters only provide an option to specify a
> list of users to HIDE.
>
> I raised the issue @ #sddm of whether the ShowUsers= option exists, or
> could be added.  Ended up with a debate as to why the option to specify
> users is needed, and that it's not really the users choice ...  No thanks
> to that.
>
> In #kde I was told that lightdm is a more flexible option, works with KDE,
> but was speculated that it does not -- in the currently available greeters
> -- have the ShowUsers= option.
>
> DOES lightdm currently have the capability?
>
> If not, is the limitation in the current greeters? Or in the underlying
> libraries?
>
> Could this feature just be added, and made available to all the greeters?
>
>
> Thanks,
>
> Rob
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