Bug#775608: shutdown-at-night: fails to shut down the system if gdm3 is used

[Petter Reinholdtsen]

[Wolfgang Schweer]
> The gdm3 greeter seems to be a special gnome-session running as a user
> with name '(unknown)'. shutdown-at-night uses 'who' to decide if users
> are still active but doesn't recognize this very case.

Gah, I really wish gdm would make up its mind on how to handle utmp and
wtmp.

> The patch has been tested and commited to git.
>
> (wheezy is affected as well, version: 0.10+deb7u2)

Look good to me.  Should we try to get it into Jessie?  I can't upload
at the moment, so I hope someone can step up. :)

-- 
Happy hacking
Petter Reinholdtsen