{config, ...}:
# This module defines common default settings that all OS builds should include.
let
  ports = import ../Cloud/Ports.nix;
in {
  boot.tmp.cleanOnBoot = true;
  networking.firewall.allowPing = true;
  nix.settings.substituters = ["https://cache.nixos.org"]; # "ssh://dev.simatime.com" ];
  nix.gc.automatic = true;
  nix.gc.dates = "Sunday 02:15";
  nix.optimise.automatic = true;
  nix.optimise.dates = ["Sunday 02:30"];
  nix.settings.extra-sandbox-paths = [config.programs.ccache.cacheDir];
  nix.settings.trusted-users = ["ben"];
  programs.ccache.enable = true;
  programs.mosh.enable = true;
  programs.mosh.withUtempter = true;
  security.acme.defaults.email = "ben@bsima.me";
  security.acme.acceptTerms = true;
  security.sudo.wheelNeedsPassword = false;
  services.clamav.daemon.enable = true; # security
  services.clamav.updater.enable = true; # security
  services.fail2ban.enable = true; # security
  services.fail2ban.ignoreIP = [ports.bensIp]; # my home IP
  services.fail2ban.maxretry = 10;
  services.openssh.enable = true;
  services.openssh.openFirewall = true;
  services.openssh.settings.X11Forwarding = true;
  services.openssh.settings.PasswordAuthentication = false;
  services.openssh.settings.PermitRootLogin = "prohibit-password";
  system.autoUpgrade.enable = false; # 'true' breaks our nixpkgs pin
  zramSwap.enable = true;
}