Nix has a build cache which is keyed by a hash of the build inputs, so a package will only be rebuilt if sources or dependencies change. The cache is immutable

Nix has a build cache which is keyed by a hash of the build inputs, so a package will only be rebuilt if sources or dependencies change. The cache is immutable and is populated on demand from the network. https://nixos.org/nix/ https://nixos.org/nix/