let channelUrl = "https://github.com/NixOS/nixpkgs-channels/archive/nixos-unstable.tar.gz"; nixpkgs = builtins.fetchTarball channelUrl; pkgs = import nixpkgs {}; in pkgs.mkShell { NIX_PATH="nixpkgs=${nixpkgs}"; buildInputs = [ pkgs.git-crypt pkgs.nixops ]; }