beamPackages.expert: add updateScript

{

  _experimental-update-script-combinators,

  erlang,

  fetchFromGitHub,

  mixRelease,

  lib,

  fetchMixDeps,

  gnused,

  lib,

  mixRelease,

  nix-update-script,

  nurl,

  writeShellApplication,

}:

let

  version = "0.1.0";

  passthru = {

    inherit engineDeps;

    updateScript = _experimental-update-script-combinators.sequence [

      (nix-update-script { })

      (lib.getExe (writeShellApplication {

        name = "expert-update-engine";

        runtimeInputs = [

          gnused

          nurl

        ];

        text = ''

          nixpkgs="$(git rev-parse --show-toplevel)"

          engineHashOld=${engineDeps.hash}

          engineHashNew=$(nurl -e "(import $nixpkgs/. { }).$UPDATE_NIX_ATTR_PATH.engineDeps")

          echo "$UPDATE_NIX_ATTR_PATH.engineDeps.hash" >&2

          sed -i "s|$engineHashOld|$engineHashNew|" "$nixpkgs"/pkgs/development/beam-modules/expert/default.nix

        '';

      }))

    ];

  };

  meta = {