config/profiles/auto-upgrade.nix

{ config, pkgs, lib, inputs, ... }:
{

  system.autoUpgrade.enable = true;
  #system.autoUpgrade.allowReboot = true; # reboot after a kernel (module) or initrd upgrade, consider also setting `rebootWindow`

  # TODO: make /etc/nixos a symlink to the in-store flake? - bad idea, horrible error recovery
  # TODO: make /etc/nixos a writeable checkout of repo?
  environment.etc."current-system-flake".source = inputs.self; # the plan was to allow me to locate the new flake.lock, but alas https://github.com/NixOS/nix/issues/6895

  system.autoUpgrade.flake = inputs.self.outPath; # a nix store path
  #system.autoUpgrade.flake = "github:pbsds/nix-config"; # TODO: use this instead?

  system.autoUpgrade.flags = [
    "--recreate-lock-file" # fetch new inputs
    "--no-write-lock-file" # no write new flakelock, as the in-store flake is read-only
    "-L"                   # print build logs
  ];

}