
Supporting a path here is important because it allows e.g. fetching a configuration from a URL. To do this and provide the configuration as a string, IFD would be necessary. It's just written into a path anyway.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.