{
  description = "cy's flake";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    sops-nix = {
      url = "github:Mic92/sops-nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    home-manager = {
      url = "github:nix-community/home-manager";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    treefmt = {
      url = "github:numtide/treefmt-nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    disko = {
      url = "github:nix-community/disko/latest";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    lanzaboote = {
      url = "github:nix-community/lanzaboote/v0.4.1";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    nixvim = {
      url = "github:nix-community/nixvim";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    flake-parts.url = "github:hercules-ci/flake-parts";
    flake-parts.inputs.nixpkgs-lib.follows = "nixpkgs";

    nixpkgs-btrbk.url = "github:cything/nixpkgs/btrbk"; # unmerged PR
    nixpkgs-garage.url = "github:cything/nixpkgs/garage-module"; # unmerged PR
  };

  nixConfig = {
    extra-substituters = [
      "https://cache.cything.io/central"
      "https://cache.cything.io/infra-ci"
      "https://cache.cything.io/attic"
    ];
    extra-trusted-public-keys = [
      "central:uWhjva6m6dhC2hqNisjn2hXGvdGBs19vPkA1dPEuwFg="
      "infra-ci:xG5f5tddUBcvToYjlpHD5OY/puYQkKmgKeIQCshNs38="
      "attic:HL3hVpqXxwcF7Q1R+IvU2i0+YxIjQA2xxKM5EJMXLLs="
    ];
    builders-use-substitutes = true;
  };

  outputs =
    inputs@{ flake-parts, nixpkgs, home-manager, disko, ...}:
    flake-parts.lib.mkFlake { inherit inputs; } {
      systems = [
        "x86_64-linux"
      ];
      imports = [
        inputs.treefmt.flakeModule
      ];
      perSystem =
      {
        self',
        system,
        ...
      }:
      {
        treefmt = {
          projectRootFile = "flake.nix";
          programs.nixfmt.enable = true;
          programs.stylua.enable = true;
          programs.yamlfmt.enable = true;
          programs.typos.enable = true;
          programs.shellcheck.enable = true;
          programs.deadnix.enable = true;

          settings.global.excludes = [ "secrets/*" ];
        };
      };

      flake.nixosConfigurations =
      let
        lib = nixpkgs.lib;

        overlays = [
          # (overlayPkgsFromFlake inputs.eza [
          # ])
        ] ++ import ./overlay;

        pkgs = 
          import nixpkgs {
            inherit overlays;
            config = {
              allowUnfree = true;
            };
          };
      in
        {
          ytnix = lib.nixosSystem {
            specialArgs = { inherit inputs; };
            modules = [
              {
                nixpkgs = { inherit pkgs; };
              }
              ./hosts/ytnix
              inputs.sops-nix.nixosModules.sops
              ./modules
              inputs.lanzaboote.nixosModules.lanzaboote
            ];
          };

          chunk = lib.nixosSystem {
            specialArgs = { inherit inputs; };
            modules = [
              {
                nixpkgs = { inherit pkgs; };
                disabledModules = [
                  "services/web-servers/garage.nix"
                ];
              }
              ./hosts/chunk
              inputs.sops-nix.nixosModules.sops
              ./modules
              (inputs.nixpkgs-garage + "/nixos/modules/services/web-servers/garage.nix")
            ];
          };

          titan = lib.nixosSystem {
            specialArgs = { inherit inputs; };
            modules = [
              {
                nixpkgs = { inherit pkgs; };
              }
              ./hosts/titan
              disko.nixosModules.disko
              inputs.sops-nix.nixosModules.sops
              ./modules
            ];
          };
        };

      # homeConfigurations = {
      #   "yt@ytnix" = home-manager.lib.homeManagerConfiguration {
      #     inherit pkgs;
      #     extraSpecialArgs = { inherit inputs; };
      #     modules = [
      #       ./home/yt/ytnix.nix
      #       inputs.nixvim.homeManagerModules.nixvim
      #     ];
      #   };
      #
      #   "yt@chunk" = home-manager.lib.homeManagerConfiguration {
      #     inherit pkgs;
      #     extraSpecialArgs = { inherit inputs; };
      #     modules = [
      #       ./home/yt/chunk.nix
      #       inputs.nixvim.homeManagerModules.nixvim
      #     ];
      #   };
      # };
    };
}