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{
  lib,
  pkgs,
  ...
}:
let
  instanceType = lib.types.submodule {
    options = {
      enable = lib.mkEnableOption "Enable Kopia instance";
      user = lib.mkOption {
        type = lib.types.str;
        default = "root";
        description = "User under which the Kopia instance runs.";
      };
      environmentFile = lib.mkOption {
        type = lib.types.nullOr lib.types.path;
        default = null;
        description = "File containing environment variables for kopia like password.";
      };
    };
  };
  mkInstanceServices =
    instances: serviceCreator:
    lib.pipe instances [
      (lib.attrsets.mapAttrs' serviceCreator)
      (lib.recursiveUpdate { })
    ];
in
{
  imports = [
    {
      _module.args.mkInstanceServices = mkInstanceServices;
      imports = [
        ./repositories.nix
        ./maintenance.nix
        ./snapshot.nix
        ./policy.nix
        ./web.nix
      ];
    }
  ];

  options.services.kopia = {
    enable = lib.mkEnableOption "Enable Kopia backup";
    instances = lib.mkOption {
      type = lib.types.attrsOf instanceType;
      default = { };
    };
  };

  config.environment.systemPackages = [ pkgs.kopia ];
}