flake.lock

{
  "nodes": {
    "nixpkgs": {
      "locked": {
        "lastModified": 1747967828,
        "narHash": "sha256-wA/ckEEgrmv+0N2L4BQ7XfU1DHvCGTDd4nPpZwmqi6I=",
        "owner": "nixos",
        "repo": "nixpkgs",
        "rev": "eda6a410f1ac02dc9a0e60869dd5b7e134d04d4f",
        "type": "github"
      },
      "original": {
        "owner": "nixos",
        "repo": "nixpkgs",
        "rev": "eda6a410f1ac02dc9a0e60869dd5b7e134d04d4f",
        "type": "github"
      }
    },
    "root": {
      "inputs": {
        "nixpkgs": "nixpkgs"
      }
    }
  },
  "root": "root",
  "version": 7
}

flake.nix

{
  # latest master as of 2025-05-22
  inputs.nixpkgs.url = "github:nixos/nixpkgs/eda6a410f1ac02dc9a0e60869dd5b7e134d04d4f";
  outputs = { nixpkgs, ... }@inputs: {
    debugInputs = inputs;
    nixosConfigurations.example = nixpkgs.lib.nixosSystem {
      system = "x86_64-linux";
      modules = [
        {
          boot.supportedFilesystems = [ "notARealFileSystem" ];
        }
        # isoInstaller has enough options to make it Just Build for this example
        "${inputs.nixpkgs}/nixos/modules/installer/cd-dvd/installation-cd-minimal.nix"
      ];
    };
  };
}