bug#44644: /tmp/emacs0/ not cleaned up upon exit

[Eli Zaretskii <eliz@gnu.org>]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: jidanni@jidanni.org,  44644@debbugs.gnu.org
> Date: Fri, 27 Nov 2020 08:48:30 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > At most, yes.  The problem is, it isn't easy to know when the
> > directory is under /tmp (we don't use temporary-file-directory, for
> > the reasons explained in the comment to server-socket-dir).  Maybe we
> > should put some special property on server-dir when that is the case?
> 
> Did you mean server-socket-dir instead of server-dir here?

Yes, sorry.

> Yes, I guess that'd be possible, but the user may change
> server-socket-dir without changing the property...
> 
> We could literally just check whether the parent of server-socket-dir is
> "/tmp" and only delete then.  It'd be pretty defensive, but should fix
> this minor annoyance.

If no better ideas come to mind, yes.

I actually don't share the feeling of an annoyance here: /tmp is
regularly cleaned up anyway, right?  But that's me.