00:32 <antifuchs> hm, not sure I asked this before, but what's the best way to pin a specific nixpkgs version? I'm using niv to pin all my other deps, would love to use it to pin nixpkgs, as well

00:33 <antifuchs> should I just set `nixpkgs.config.packageOverrides` to a function that returns my niv'd nixpkgs?

00:39 <antifuchs> huh, yeah, that's it, I think!

11:29 <Mic92> antifuchs: nix flakes can do it for you, this is considered experimental for now, but will become the goto solution in future. You can also set your NIX_PATH with entries from niv in your configuration.nix.

11:29 <Mic92> I do something similar with flakes: https://github.com/Mic92/dotfiles/blob/master/nixos/configurations.nix#L15

11:30 <Mic92> I am not a heavy darwin-nix user, but I suppose their should be a similar mechanism for macOS.

17:48 <adelbertc> how do ir eference.. an "existing overlay" like https://github.com/nix-community/emacs-overlay in my (non-NixOS) system (macOS)? I dump my own overlays in `~/.config/nixpkgs/overlays/` but I don't know how I would reference the Emacs one?

21:56 <aterius> You could do something like this

21:56 <aterius> echo "import (builtins.fetchTarball {

21:56 <aterius> })" >> $HOME/.config/nixpkgs/overlays/emacs.nix

21:56 <aterius> url = https://github.com/nix-community/emacs-overlay/archive/master.tar.gz;