Hi, > On 30 Mar 2015, at 15:07, Eelco Dolstra <eelco.dols...@logicblox.com> wrote: > > We could add an option to suppress creating a new generation if nothing has > changed.
I read some code and I have a suggestion - tell me if I’m missing something obvious, because this looks really simple. In createGeneration we already look at the existing generations https://github.com/NixOS/nix/blob/master/src/nix-env/profiles.cc#L77 <https://github.com/NixOS/nix/blob/master/src/nix-env/profiles.cc#L77> Looking at the generation links, I can see this in my profiles directory: lrwxr-xr-x 1 ctheune wheel 60B Mar 17 17:15 default-30-link -> /nix/store/ywgj0k27h2c6ly7l40afbqxncis858c1-user-environment lrwxr-xr-x 1 ctheune wheel 60B Mar 17 17:16 default-31-link -> /nix/store/ywgj0k27h2c6ly7l40afbqxncis858c1-user-environment lrwxr-xr-x 1 ctheune wheel 60B Mar 17 17:16 default-32-link -> /nix/store/ywgj0k27h2c6ly7l40afbqxncis858c1-user-environment So. How about adapting createGeneration to not create a new generation if it targets the same environment as the previous one? Maybe with an option? Would this be the right point to change this? Am I missing something? Looks quite simple to me (minus my C++ writing abilities being basically nonexisting). If this path looks OK to you then I’d be happy to bash my head against the C++ to learn something. Christian — Christian Theune · c...@flyingcircus.io · +49 345 219401 0 Flying Circus Internet Operations GmbH · http://flyingcircus.io Forsterstraße 29 · 06112 Halle (Saale) · Deutschland HR Stendal HRB 21169 · Geschäftsführer: Christian. Theune, Christian. Zagrodnick
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