From 664506b6cb64a98dc36dd0b097102a9d89cfaddb Mon Sep 17 00:00:00 2001
From: Ryan Yin <xiaoyin_c@qq.com>
Date: Fri, 4 Aug 2023 22:37:18 +0800
Subject: [PATCH] feat: use the same nixpkgs as much as possible

---
 lib/nixosSystem.nix | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/lib/nixosSystem.nix b/lib/nixosSystem.nix
index 1d4ba987..0cdc157e 100644
--- a/lib/nixosSystem.nix
+++ b/lib/nixosSystem.nix
@@ -14,6 +14,15 @@ in
     modules =
       nixos-modules
       ++ [
+        {
+          # make `nix run nixpkgs#nixpkgs` use the same nixpkgs as the one used by this flake.
+          nix.registry.nixpkgs.flake = nixpkgs;
+
+          # make `nix repl '<nixpkgs>'` use the same nixpkgs as the one used by this flake.
+          environment.etc."nix/inputs/nixpkgs".source = "${nixpkgs}";
+          nix.nixPath = ["/etc/nix/inputs"];
+        }
+
         nixos-generators.nixosModules.all-formats
         {
           # formatConfigs.iso = {config, ...}: {};