# nix-channel --add https://nixos.org/channels/nixos-19.03 nixos
# nix-channel --add https://nixos.org/channels/nixos-unstable unstable
# nix-channel --update
#
{ config, pkgs, lib, ... }:
let
  unstable = import <unstable> {};
  secrets = import ./secrets.nix;
  hostname = "code.dumpstack.io";
in {
  disabledModules = [ "services/misc/gitea.nix" ];

  imports = [
    ./hardware-configuration.nix
    <unstable/nixos/modules/services/misc/gitea.nix>
  ];

  boot.loader.grub.enable = true;
  boot.loader.grub.version = 2;
  boot.loader.grub.device = "/dev/vda";

  networking.hostName = "${hostname}";

  networking.firewall =  {
    enable = true;
    allowedTCPPorts = [ 80 443 ];
  };

  users.extraUsers.root = {
    openssh.authorizedKeys.keys = [ secrets.pubkey ];
  };

  services.openssh.enable = true;

  environment.systemPackages = with pkgs; [
    vim
  ];

  services.gitea = {
    enable = true;
    appName = "${hostname}";
    domain = "${hostname}";
    rootUrl = "https://${hostname}";
    extraConfig = ''
      [service]
      DISABLE_REGISTRATION = true

      [ui]
      DEFAULT_THEME = gitea
    '';
  };

  systemd.services.gitea.serviceConfig.SystemCallFilter =
    lib.mkForce "~@clock @cpu-emulation @debug @keyring @memlock @module @mount @obsolete @raw-io @reboot @resources @setuid @swap";

  services.nginx = {
    enable = true;
    virtualHosts."${hostname}" = {
      enableACME = true;
      forceSSL = true;

      locations."/".proxyPass = "http://127.0.0.1:3000";
    };
  };

  # force update all channels
  systemd.services.nixos-upgrade.serviceConfig.ExecStartPre =
    "${pkgs.nix}/bin/nix-channel --update";

  systemd.services.nixos-upgrade.serviceConfig.ExecStartPost = pkgs.writeScript "post-upgrade-check" ''
    #!${pkgs.stdenv.shell}
    current=$(readlink -f /run/current-system/kernel)
    booted=$(readlink -f /run/booted-system/kernel)
    if [ "$current" != "$booted" ]; then
      echo "kernel changed, reboot" | systemd-cat --identifier "post-upgrade-check";
      reboot
    else
      echo "same kernel, do not reboot" | systemd-cat --identifier "post-upgrade-check";
    fi
  '';

  system.stateVersion = "19.03";
  system.autoUpgrade.enable = true;

  nix = {
    optimise.automatic = true;
    gc = {
      automatic = true;
      options = "--delete-older-than 7d";
    };
  };
}