1{
 2  den.aspects.core.nix = {
 3    nixos = {
 4      nix.settings = {
 5        experimental-features = [
 6          "nix-command"
 7          "flakes"
 8          "auto-allocate-uids"
 9          "cgroups"
10        ];
11        # Select UIDs for builds automatically, EXPERIMENTAL
12        auto-allocate-uids = true;
13        # Required by auto-allocate-uids
14        use-cgroups = true;
15        # Automatically hard link identical files in the Nix store
16        auto-optimise-store = true;
17        # Remote servers preferred substituters instead of local builders
18        builders-use-substitutes = true;
19        # Unlimited HTTP connections
20        http-connections = 0;
21        # Use `$XDG_STATE_HOME/nix/...` instead of `$HOME/.nix-...`
22        use-xdg-base-directories = true;
23
24        trusted-users = ["@wheel"];
25
26        flake-registry = "";
27
28        substituters = [
29          # Official cache's mirrors located in China
30          "https://mirrors.ustc.edu.cn/nix-channels/store?priority=10"
31          "https://mirrors.tuna.tsinghua.edu.cn/nix-channels/store?priority=10"
32          # Official cache
33          "https://nix-community.cachix.org?priority=11"
34
35          # Nixpkgs with CUDA enabled cache
36          "https://cache.flox.dev?priority=20"
37        ];
38        trusted-public-keys = [
39          "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
40
41          "flox-cache-public-1:7F4OyH7ZCnFhcze3fJdfyXYLQw/aV7GEed86nQ7IsOs="
42        ];
43      };
44      nix.channel.enable = false;
45
46      nixpkgs.flake.setFlakeRegistry = true;
47
48      system.copySystemConfiguration = false;
49    };
50  };
51}