{ lib, ... }: { # Define impermanence options that need to be available to all modules # The actual impermanence implementation is in common/impermanence.nix or common/impermanence-tmpfs.nix options.custom.impermanence.persistPath = lib.mkOption { type = lib.types.str; default = "/persist"; description = "Path where persistent data is stored (e.g., /persist for btrfs, /nix/persist for tmpfs)"; }; }