nixpkgs/nixos/modules/services/x11/display-managers/auto.nix

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{ config, pkgs, ... }:
with pkgs.lib;
let
dmcfg = config.services.xserver.displayManager;
cfg = dmcfg.auto;
in
{
###### interface
options = {
services.xserver.displayManager.auto = {
enable = mkOption {
default = false;
description = ''
Whether to enable the fake "auto" display manager, which
automatically logs in the user specified in the
<option>user</option> option. This is mostly useful for
automated tests.
'';
};
user = mkOption {
default = "root";
description = "The user account to login automatically.";
};
};
};
###### implementation
config = mkIf cfg.enable {
services.xserver.displayManager.slim = {
enable = true;
autoLogin = true;
defaultUser = cfg.user;
};
};
}