{
  config,
  pkgs,
  lib,
  ...
}:

# serge <3
# TODO: distributed sccache (with redis)

{
  programs.ccache.enable = true;
  programs.ccache.owner = "root"; # default
  programs.ccache.group = "nixbld"; # default

  programs.nix-required-mounts.enable = true;
  programs.nix-required-mounts.allowedPatterns."ccache" = {
    onFeatures = [
      "ccache"
      "sccache"
    ];
    paths = [
      config.programs.ccache.cacheDir
      "/var/cache/sccache"
    ];
  };

  nix.settings.system-features = [
    "ccache"
    "sccache"
  ];
  systemd.tmpfiles.settings."50-ccache" =
    let
      tmp = rec {
        "d" = {
          user = config.programs.ccache.owner;
          group = config.programs.ccache.group;
          mode = "0770";
        };
        "Z" = d;
      };
    in
    {
      "/var/cache/ccache" = tmp;
      "/var/cache/sccache" = tmp;
    };

}