nixos-config/flake.nix

{
  description = "Entrypoint of all nix configurations";

  inputs = {
    disko.url = "github:nix-community/disko";
    hardware.url = "github:nixos/nixos-hardware";
    home-manager.url = "github:nix-community/home-manager";
    jovian.url = "github:Jovian-Experiments/Jovian-NixOS";
    mailserver.url = "gitlab:simple-nixos-mailserver/nixos-mailserver";
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    nix-custom.url = "git+https://forgejo.invariantspace.com/macronova/nix-custom";
    plasma-manager.url = "github:pjones/plasma-manager";
    sops-nix.url = "github:Mic92/sops-nix";
  };

  outputs = inputs @ {
    self,
    nixpkgs,
    nix-custom,
    ...
  }: let
    linuxCfgDir = ./linux;
    templateDir = ./template;
  in {
    nixosConfigurations =
      builtins.mapAttrs
      (instance: _:
        nixpkgs.lib.nixosSystem {
          modules = [
            # Import config from folder
            (linuxCfgDir + "/${instance}")
            # Setup Nix
            ({pkgs, ...}: {
              networking.hostName = instance;
              nix = {
                gc = {
                  automatic = true;
                  options = "--delete-older-than 30d";
                };
                settings = {
                  auto-optimise-store = true;
                  experimental-features = ["nix-command" "flakes"];
                  trusted-substituters = ["https://mirrors.tuna.tsinghua.edu.cn/nix-channels/store"];
                };
              };
              nixpkgs = {
                config.allowUnfree = true;
                overlays = [nix-custom.overlays.default];
              };
            })
          ];
          specialArgs = {inherit inputs;};
        })
      (builtins.readDir linuxCfgDir);
    templates =
      builtins.mapAttrs
      (template: _: {
        path = templateDir + "/${template}";
        description = "Template flake setup: ${template}";
      })
      (builtins.readDir templateDir);
  };
}