nixpkgs/nixos/modules/programs/dconf.nix

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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.programs.dconf;
mkDconfProfile = name: path:
{ source = path; target = "dconf/profile/${name}"; };
in
{
###### interface
options = {
programs.dconf = {
enable = mkEnableOption "dconf";
profiles = mkOption {
type = types.attrsOf types.path;
default = {};
description = "Set of dconf profile files.";
internal = true;
};
};
};
###### implementation
config = mkIf (cfg.profiles != {} || cfg.enable) {
environment.etc = optionals (cfg.profiles != {})
(mapAttrsToList mkDconfProfile cfg.profiles);
services.dbus.packages = [ pkgs.gnome3.dconf ];
environment.variables.GIO_EXTRA_MODULES = optional cfg.enable
"${pkgs.gnome3.dconf.lib}/lib/gio/modules";
# https://github.com/NixOS/nixpkgs/pull/31891
#environment.variables.XDG_DATA_DIRS = optional cfg.enable
# "$(echo ${pkgs.gnome3.gsettings-desktop-schemas}/share/gsettings-schemas/gsettings-desktop-schemas-*)";
};
}