1# Behaves like `<nixpkgs>` but pinned. Like `<nixpkgs>`, requires attrset for opt overlays.
 2attrs:
 3let
 4  hostpkgs = import <nixpkgs> {};
 5  pinnedNixpkgs = hostpkgs.lib.importJSON ./nixpkgs.json;
 6  nixpkgs = builtins.fetchTarball {
 7    url = pinnedNixpkgs.url;
 8    sha256 = pinnedNixpkgs.sha256;
 9  };
10in import nixpkgs attrs