nixpkgs/nixos/modules/services/hardware/upower.nix

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# Upower daemon.
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.upower;
in
{
###### interface
options = {
services.upower = {
enable = mkOption {
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type = types.bool;
default = false;
description = ''
Whether to enable Upower, a DBus service that provides power
management support to applications.
'';
};
package = mkOption {
type = types.package;
default = pkgs.upower;
defaultText = "pkgs.upower";
example = lib.literalExample "pkgs.upower";
description = ''
Which upower package to use.
'';
};
};
};
###### implementation
config = mkIf cfg.enable {
environment.systemPackages = [ cfg.package ];
services.dbus.packages = [ cfg.package ];
services.udev.packages = [ cfg.package ];
systemd.packages = [ cfg.package ];
};
}