Initial framework: reusable modules, lib, pkgs, overlays, scripts, sample environment

pkgs/README.md

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+# Packages
+Custom software packages not found in upstream Nixpkgs.
+Contains project-specific derivations (default.nix).
+Can be referenced via overlays or directly by hosts.

pkgs/default.nix

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+let
+  spec = builtins.fromJSON (builtins.readFile ./nixpkgs.json);
+in
+import (builtins.fetchTarball {
+  url = "https://github.com/NixOS/nixpkgs/archive/${spec.rev}.tar.gz";
+  sha256 = spec.sha256;
+}) {}
+# TODO: add a nixos-infra module

pkgs/nixpkgs.json

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+{
+  "url": "https://github.com/NixOS/nixpkgs/archive/755f5aa91337890c432639c60b6064bb7fe67769.tar.gz",
+  "rev": "755f5aa91337890c432639c60b6064bb7fe67769",
+  "sha256": "1lmn8dicfwmsfdaiw18xjjys78bal6yjy3a41j02my7kw0wlb76a"
+}