{ privateFiles }:
{ config, pkgs, ... }:
{
  boot.kernelPackages = pkgs.linuxPackages_latest;
  myEnv = import "${privateFiles}/environment.nix" // { inherit privateFiles; };

  networking = {
    firewall.enable = true;
    # 176.9.151.89 declared in nixops -> infra / tools
    interfaces."eth0".ipv4.addresses = pkgs.lib.attrsets.mapAttrsToList
      (n: ips: { address = ips.ip4; prefixLength = 32; })
      (pkgs.lib.attrsets.filterAttrs (n: v: n != "main") config.hostEnv.ips);
    interfaces."eth0".ipv6.addresses = pkgs.lib.flatten (pkgs.lib.attrsets.mapAttrsToList
      (n: ips: map (ip: { address = ip; prefixLength = (if n == "main" && ip == pkgs.lib.head ips.ip6 then 64 else 128); }) (ips.ip6 or []))
      config.hostEnv.ips);
  };

  imports = builtins.attrValues (import ../..);

  boot.kernel.sysctl = {
    # https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.md
    "net.ipv4.tcp_sack" = 0;
  };
  myServices.buildbot.enable = true;
  myServices.databases.enable = true;
  myServices.gitolite.enable = true;
  myServices.monitoring.enable = true;
  myServices.irc.enable = true;
  myServices.pub.enable = true;
  myServices.tasks.enable = true;
  myServices.mpd.enable = true;
  myServices.dns.enable = true;
  myServices.certificates.enable = true;
  myServices.websites.enable = true;
  myServices.mail.enable = true;
  myServices.ejabberd.enable = true;
  myServices.vpn.enable = true;
  services.pure-ftpd.enable = true;
  services.duplyBackup.enable = true;
  services.duplyBackup.profiles.oldies.rootDir = "/var/lib/oldies";

  secrets.keys = [
    {
      dest = "rsync_backup/identity";
      user = "root";
      group = "root";
      permissions = "0400";
      text = config.myEnv.rsync_backup.ssh_key.private;
    }
  ];
  programs.ssh.knownHosts.dilion = {
    hostNames = ["dilion.immae.eu"];
    publicKey = let
      profile = config.myEnv.rsync_backup.profiles.dilion;
    in
      "${profile.host_key_type} ${profile.host_key}";
  };

  deployment = {
    targetEnv = "hetzner";
    hetzner = {
      robotUser = config.myEnv.hetzner.user;
      robotPass = config.myEnv.hetzner.pass;
      mainIPv4 = config.hostEnv.ips.main.ip4;
      partitions = ''
        clearpart --all --initlabel --drives=sda,sdb

        part swap1 --recommended --label=swap1 --fstype=swap --ondisk=sda
        part swap2 --recommended --label=swap2 --fstype=swap --ondisk=sdb

        part raid.1 --grow --ondisk=sda
        part raid.2 --grow --ondisk=sdb

        raid / --level=1 --device=md0 --fstype=ext4 --label=root raid.1 raid.2
      '';
    };
  };

  services.cron = {
    enable = true;
    mailto = "cron@immae.eu";
    systemCronJobs = [
      ''
        # The star after /var/lib/* avoids deleting all folders in case of problem
        0 3,9,15,21 * * * root rsync -e "ssh -i /var/secrets/rsync_backup/identity" --new-compress -aAXv --delete --numeric-ids --super --rsync-path="sudo rsync" /var/lib/* backup@dilion.immae.eu: > /dev/null
        0 0 * * * root journalctl -q --since="25 hours ago" -u postfix -g "immae.eu.*Recipient address rejected"
      ''
    ];
  };

  # This value determines the NixOS release with which your system is
  # to be compatible, in order to avoid breaking some software such as
  # database servers. You should change this only after NixOS release
  # notes say you should.
  # https://nixos.org/nixos/manual/release-notes.html
  system.stateVersion = "19.03"; # Did you read the comment?
}