cfb7abc7fc
When a user logs into a non-default area we give them a private $HOME for that area (that's what 'area' is supposed to be after all). We so far left $XDG_RUNTIME_DIRECTORY as it was. Let's change that and mirror the subdirectory logic there too. Why? $XDG_RUNTIME_DIR is generally the place where AF_UNIX sockets are bound that can be used to connect to per-user services. (in particular all those which are behind D-Bus.) If we don't patch $XDG_RUNTIME_DIR like this then this means all the backing services will use the main area, which is problematic (since clients and services will disagree on $HOME), and makes it impossible to support the area concept for graphical logins properly. This does not actually make graphical logins work, but it at least makes them fail cleanly. That's because this patch alone won't make sure a per-area service manager/dbus instance is invoked automatically. That however can be added later, in a patch to logind.
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