bug#56971: greeter user permissions are not enough to talk with seatd

[Liliana Marie Prikler <liliana.prikler@ist.tugraz.at>]

block 56971 by 56690 56699
thanks

Hi muradm,

Am Donnerstag, dem 04.08.2022 um 12:45 +0300 schrieb muradm:
> [...] greeter (e.g. gtkgreet) requiring communication
> with seatd is failing to start, causing "black screen"
> behavior on active terminal (switching to the other non seatd
> related terminal is possible, for manual permissions
> adjustment as workaround).
> 
> To address this issue, we need more flexible control over
> seatd user/group, which creates seatd.sock, and greeter user
> which connects to seatd.sock.
Okay.

> However, not all greeters require that, so I decided to make
> more flexible.
Flexibility for its own sake is not always the right solution.  On the
other hand, looking at the two patches, it appears they are to be used
in combination?

>  Propsed solutions consists of:
> 
> * 56690 - gnu: seatd-service-type: Should use seat group.
> With this change, if seatd-service-type is present in the
> system configuration, "seat" group will be added, and seatd
> will run as root/seat. Group is configurable, but default is 
> "seat".
Why just the group and no user?  Is it not possible to launch seatd as
non-root?

> * 56699 - gnu: greetd-service-type: Add greeter-extra-groups 
>   config field.
> With this change, if user wants to use seatd-service-type with
> greeter requiring seatd.sock, he can add "seat" group to
> greeter-extra-groups field.
Note that you still have a TODO on that patch.

Cheers