Earlier quoted context omitted.
Wait, isn't a point of NixOS is that your updates are guaranteed to be smooth? I haven't used it, but your story now worries me. I don't want to be back at "just reinstall the OS" days, even if configuration is portable.
On NixOS installing any package is the same as reinstalling the operating system. Reinstalling the operating system just took a minute longer because it had to do more downloading. (edit: in theory, I actually bet that the certificates sneakily leak mutable state into the system with the expiry process, i.e. I bet that if I reinstalled the same version of NixOS with the same configuration, I'd get an install that wou…
I've only ever noticed one difference: installing the bootloader only happens on nixos-install, not always on nixos-rebuild