nix-config/config/default.nix

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

# this file contains default configuration that may be turned on depending on other config settings.
# options should go to modules.

lib.mkMerge [
  {
    boot.cleanTmpDir = true;

    documentation.nixos.enable = false;

    environment = {
      gnome.excludePackages = with pkgs; [
        epiphany # we are using firefox or chromium and requires second webkitgtk
      ];
      noXlibs = !lib.any (host: host == config.networking.hostName) [ "dacbert" "glotzbert" "rpi-netboot" ];
      systemPackages = with pkgs; [
        bmon
        curl
        dig
        ethtool
        git
        htop
        iotop
        mtr
        pv
        ripgrep
        screen
        tcpdump
        tree
        vim
        wget
      ];
    };

    hardware.enableRedistributableFirmware = lib.mkDefault true;

    i18n = {
      defaultLocale = "en_US.UTF-8";
      supportedLocales = [
        "en_US.UTF-8/UTF-8"
        "de_DE.UTF-8/UTF-8"
      ];
    };

    nix = {
      settings = {
        builders-use-substitutes = true;
        connect-timeout = 20;
        experimental-features = "nix-command flakes";
        fallback = true;
        trusted-public-keys = [
          "nix-serve.hq.c3d2.de:KZRGGnwOYzys6pxgM8jlur36RmkJQ/y8y62e52fj1ps="
        ];
        # don't self feed hydra
        substituters = lib.mkIf (config.networking.hostName != "hydra") (
          lib.mkBefore [ "https://nix-serve.hq.c3d2.de" ]
        );
      };
      gc = {
        automatic = lib.mkDefault true;
        dates = "06:00";
        options = "--delete-older-than 21d";
        randomizedDelaySec = "6h";
      };
    };

    # trust sandro to set good defaults in nixos-modules
    opinionatedDefaults = true;

    services = {
      gnome.gnome-initial-setup.enable = false;
      openssh = {
        # Required for deployment and sops
        enable = true;
        permitRootLogin = "prohibit-password";
      };
      portunus = with zentralwerk.lib.config.site.net.serv; {
        domain = "auth.c3d2.de";
        externalIp4 = hosts4.auth;
        externalIp6 = hosts6.up4.auth;
      };
    };

    programs = {
      fzf.keybindings = true;
      tmux = {
        enable = true;
        aggressiveResize = true;
        baseIndex = 0;
        clock24 = true;
        historyLimit = 50000;
        terminal = "xterm-256color";
        extraConfig = ''
          # mouse control
          set -g mouse on

          # focus events enabled for terminals that support them
          set -g focus-events on

          # open new tab in PWD
          bind '"' split-window -c "#{pane_current_path}"
          bind % split-window -h -c "#{pane_current_path}"
          bind c new-window -c "#{pane_current_path}"

          # don't clear selection on copy
          bind-key -Tcopy-mode-vi MouseDragEnd1Pane send -X copy-selection-no-clear
          bind-key -Tcopy-mode-vi y send -X copy-selection-no-clear
        '';
      };
      vim.defaultEditor = true;
    };

    boot.kernel.sysctl = {
      "net.ipv4.tcp_congestion_control" = "bbr";
    };

    security.acme = {
      acceptTerms = true;
      defaults = {
        email = "mail@c3d2.de";
        # letsencrypt staging server with way higher rate limits
        # server = "https://acme-staging-v02.api.letsencrypt.org/directory";
      };
    };

    # TODO: move to nixos-modules
    services = {
      zfs.autoScrub.enable = true;
    };

    systemd = {
      # Do not break the boot
      enableEmergencyMode = false;

      # Reboot on hang
      watchdog = lib.mkIf (!config.boot.isContainer) {
        runtimeTime = "15s";
        rebootTime = "15s";
      };
    };

    time.timeZone = lib.mkDefault "Europe/Berlin";

    users.motd = builtins.readFile ./motd;

    zramSwap.enable = true;
  }
]