* Create the Nix daemon socket in a separate directory

  (/nix/var/nix/daemon-socket).  This allows access to the Nix daemon
  to be restricted by setting the mode/ownership on that directory as
  desired, e.g.

    $ chmod 770 /nix/var/nix/daemon-socket
    $ chown root.wheel /nix/var/nix/daemon-socket

  to allow only users in the wheel group to use Nix.

  Setting the ownership on a socket is much trickier, since the socket
  must be deleted and recreated every time the daemon is started
  (which would require additional Nix configuration file directives to
  specify the mode/ownership, and wouldn't support arbitrary ACLs),
  some BSD variants appear to ignore permissions on sockets, and it's
  not clear whether the umask is respected on every platform when
  creating sockets.

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