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Using a specific nixpkgs version to install a package
{ pkgs ? (import <nixpkgs> {}) }:
rec {
# import nixpkgs from a specific commit hash
oldNixpkgs = pkgs.fetchFromGitHub {
owner = "nixos";
repo = "nixpkgs";
# here goes the commit hash
rev = "c2268175651c4aa1da23c1b84ecebc0a0df56633";
sha256 = "0asjhmzwgipbmv3l58l4g4miw6mhywpzzviirys1r33ykbacvjkf";
# import the "old" packages
oldPkgs = import "${oldNixpkgs}" {};
# use the oldPkgs and use the "ripgrep" package
myRipgrep = oldPkgs.ripgrep;
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