On Mon, Mar 31, 2014 at 2:22 AM, Ben Franksen <ben.frank...@online.de>wrote:
> > Then I > > do `nix-env -i` (or whatever I need) with `-f > > <path_to_my_copy_of_nixpkgs>`. That tells Nix to use _my_ expressions. In > > case of `nixos-rebuild` there is `-I` flag. > > As I said, I really like the declarative system configuration and therefore > want to avoid ad-hoc installation using nix-env if possible. However, I > guess I can adapt that approach to changing my configuration.nix and then > doing a nixos-rebuild. > If you, for some reason, don't want to install packages to your user profile with `nix-env -i` you are free to list those packages in `environment.systemPackages`. My point was that `nixos-rebuild` has an option `-I` that tells it to use your source of expressions. So if you want to modify some NixOS modules or Nix packages, you do this in your local nixpkgs repo, edit `configuration.nix` accordingly, and run `nixos-rebuild -I nixpkgs=<path_to_your_nixpkgs> switch`. Of course you can have release branched checked-out in your local repo and you'll get the release version of NixOS with your modifications.
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