This allows quick reloads using the following trick:
$(nix-build --show-trace --no-out-link \
-E '(with import <nixpkgs/nixos> {};
pkgs.writeScript "update-hass-config"
config.systemd.services.home-assistant.preStart)')
systemctl reload home-assistant
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at https://nixos.org/nixos and in the manual in doc/manual.