nichts/modules/system/os/impermanence/module.nix

{
  inputs,
  config,
  lib,
  ...
}: let
  inherit (lib) mkIf mkForce;
  inherit (builtins) map;

  cfg = config.modules.system.impermanence;
in {
  imports = [
    inputs.impermanence.nixosModules.impermanence
  ];
  config = mkIf cfg.enable {
    users = {
      mutableUsers = true;
      users = {
        cr = {
          hashedPasswordFile = "/persist/passwords/cr";
        };
        root.hashedPasswordFile = "/persist/passwords/root";
      };
    };

    environment.persistence."/persist" = {
      enable = true;
      hideMounts = true;
      directories = [
        "/etc/nixos"
        "/etc/nix"
        "/etc/NetworkManager/system-connections"
        "/var/db/sudo"
        "/var/log"
        "/var/lib/bluetooth"
        "/var/lib/nixos"
        "/var/lib/pipewire"
        "/var/lib/systemd/coredump"
      ];

      users.cr = {
        directories =
          [
            "cloud"
            "repos"
          ]
          ++ map (
            dir: ".config/${dir}"
          ) ["nicotine" "Signal" "Nextcloud" "emacs" "doom"]
          ++ map (
            dir: ".cache/${dir}"
          ) ["tealdeer" "keepassxc" "nix" "starship" "nix-index" "mozilla" "zsh" "nvim"]
          ++ map (
            dir: ".local/share/${dir}"
          ) ["direnv" "Steam" "TelegramDesktop" "PrismLauncher" "nicotine" "zoxide" ".keepass"];
      };
    };

    # for some reason *this* is what makes networkmanager not get screwed completely instead of the impermanence module
    systemd.tmpfiles.rules = [
      "L /var/lib/NetworkManager/secret_key - - - - /persist/var/lib/NetworkManager/secret_key"
      "L /var/lib/NetworkManager/seen-bssids - - - - /persist/var/lib/NetworkManager/seen-bssids"
      "L /var/lib/NetworkManager/timestamps - - - - /persist/var/lib/NetworkManager/timestamps"
    ];

    services.openssh.hostKeys = mkForce [
      {
        bits = 4096;
        path = "/persist/etc/ssh/ssh_host_rsa_key";
        type = "rsa";
      }
      {
        bits = 4096;
        path = "/persist/etc/ssh/ssh_host_ed25519_key";
        type = "ed25519";
      }
    ];
  };
}