nix-super/flake-registry.json

{
    "flakes": {
        "dwarffs": {
            "uri": "github:edolstra/dwarffs/flake"
        },
        "nix": {
            "uri": "github:tweag/nix/flakes"
        },
        "nixpkgs": {
            "uri": "github:edolstra/nixpkgs/release-19.03"
        }
    },
    "version": 1
}