Alyssa Ross 7658c90f21
nixos/xserver: improve DM error message when X off
Previously, if you, for example, set
services.xserver.displayManager.sddm.enable, but forgot to set
services.xserver.enable, you would get an error message that looked like
this:

    error: attribute 'display-manager' missing

Which was not particularly helpful.

Using assertions, we can make this message much better.
2019-05-02 16:19:59 +00:00
..