--- /dev/null
+#!/bin/bash
+
+if [ -z "$NIXOPS_DEPLOYMENT" ]; then
+ # This will automatically upgrade to latest version at each build
+ nixpkgs="https://nixos.org/channels/nixos-19.03/nixexprs.tar.xz"
+else
+ nixpkgs="https://releases.nixos.org/nixos/19.03/nixos-19.03.172530.096e2f137b6/nixexprs.tar.xz"
+fi
+nixpkgsPrevious="$nixpkgs"
+nixpkgsNext="$nixpkgs"
+export NIX_PATH="nixpkgs=$nixpkgs:nixpkgsNext=$nixpkgsNext:nixpkgsPrevious=$nixpkgsPrevious"
+
+nixops_custom () {
+ DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+ d=$(nix-build --no-out-link -E "with import <nixpkgs> { overlays = builtins.attrValues (import $(dirname $DIR)/overlays); }; nixops")
+ ${d}/bin/nixops "$@"
+}