[Nix-dev] Gratuitous generations

[Michael Raskin]

>On Mon, Mar 30, 2015 at 9:47 PM, Ryan Trinkle <ryan.trinkle at gmail.com> wrote:
>> On a somewhat related note, is there any way to see the exact
>> configuration.nix for a particular generation?  It would be great to be able
>> to diff generations against each other (e.g.: to figure out whether a
>> channel update caused a problem or whether it was my own change).
>
>You are not the first one to request this feature.
>They are a few issues in the way, but I will open an issue and do it
>as soon as I am done with the httpd rewrite.

In the meantime just adding /etc/ entry that is a copy of 
/etc/nixos/configuration.nix should work…