{inputs, ...}: {
  flake.nixngConfigurations.mautrixFacebook = inputs.nixng.nglib.makeSystem {
    system = "x86_64-linux";
    name = "mautrix-facebook";
    inherit (inputs) nixpkgs;
    config = {
      pkgs,
      lib,
      ...
    }: let
      inherit
        (lib)
        singleton
        ;
    in {
      dumb-init = {
        enable = true;
        type.services = {};
      };

      init.services.mautrix-facebook = {
        enabled = true;
        shutdownOnExit = true;
        script = let
          mautrix-facebook = pkgs.mautrix-facebook.overridePythonAttrs (old: {
            propagatedBuildInputs = singleton pkgs.python3.pkgs.aiosqlite ++ old.propagatedBuildInputs;
          });
        in
          pkgs.writeShellScript "mautrix-facebook"
          ''
            DATA_DIR="/var/lib/mautrix-facebook"
            CONFIG_FILE="$DATA_DIR/config.yaml"
            REGISTRATION_FILE="/var/lib/registrations/mautrix-facebook.yaml"
            DB_FILE="$DATA_DIR/sqlite.db"

            cp ${./mautrix-facebook.yaml} "$CONFIG_FILE" ; chmod 755 "$CONFIG_FILE"
            ${pkgs.sqlite}/bin/sqlite3 $DB_FILE '.databases ; .quit'

            [ -e "$REGISTRATION_FILE" ] || \
              ${mautrix-facebook}/bin/mautrix-facebook -c "$CONFIG_FILE" -r "$REGISTRATION_FILE" -g
            ${mautrix-facebook}/bin/mautrix-facebook -c "$CONFIG_FILE" -r "$REGISTRATION_FILE" -n
          '';
      };
    };
  };
}