enhance(nix): Cachix

[Malix-Labs]

general enhancement, using the flake.nix's nixConfig would scope the binary cache to the flake and doesn't require to enable it prior to adding the flake input

hyprwm/Hyprland#13519 would also make it automatic

References

• https://wiki.nixos.org/wiki/Binary_Cache#Binary_cache_hint_in_Flakes
• https://wiki.nixos.org/wiki/Flakes#Nix_configuration

[fufexan]

nixConfig does not propagate to NixOS. It is only useful when building packages or system configs from a flake .

That being said, people that don't use flakes still need to use nix.settings to set the substituters, as well as anyone building their config in any other way than using flakes (e.g. nix-build, nix repl).

It might be good to mention as a one-off change that will be reverted after hyprland is installed and the substituters set, but even then it might confuse new users.

[Malix-Labs]

nixConfig does not propagate to NixOS

In which case are you confident it's the case?

My original goal was to document hyprwm/Hyprland#13519

people that don't use flakes still need to use nix.settings to set the substituters

That is true;
I was under the impression Hyprland only supported nixpkgs and flakes to be used in Nix/OS