[Nix-dev] /etc/nixos/configuration.nix not versioned?

[phreedom at yandex.ru]

On Friday, September 16, 2016 09:13:27 Wink Saville wrote:
> As a newbie I was playing around and last night I rolled back to an
> older configuration and realized that the configuration.nix file
> didn't rollback. I can now realize that configuration.nix has nothing
> to do with booting or running the system and it only builds the
> system.
> 
> But at the moment I have 20 variations of my system in
> /boot/loader/entries/* but only the "latest"
> /etc/nixos/configuration.nix. So how are people managing
> configuration.nix files and keeping them 'synchronized' with /boot/**/
> in particular /boot/loader/entries/* ?
> 
> What I've just done is put /etc/nixos into a git repository, but that
> puts the burden on me to keep it synchronized with the
> /boot/loader/entries. Hopefully there is a better way.
> 
> -- Wink
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A bit hacky solution: system.copySystemConfiguration = true;
A more formal solution would be to version all your stuff yourself with nixpkgs 
as a submodule if necessary.