{ privateFiles }:
{ config, pkgs, lib, ... }:
{
  boot.supportedFilesystems = [ "zfs" ];
  boot.kernelParams = ["zfs.zfs_arc_max=6442450944"];
  boot.kernelPackages = pkgs.linuxPackages_latest;
  myEnv = import "${privateFiles}/environment.nix" // { inherit privateFiles; };

  fileSystems = {
    "/"     = lib.mkForce { fsType = "zfs"; device = "zpool/root"; };
    "/boot" = { fsType = "ext4"; device = "/dev/disk/by-uuid/e6bb18fb-ff56-4b5f-ae9f-e60d40dc0622"; };
    "/etc"  = { fsType = "zfs"; device = "zpool/root/etc"; };
    "/nix"  = { fsType = "zfs"; device = "zpool/root/nix"; };
    "/tmp"  = { fsType = "zfs"; device = "zpool/root/tmp"; };
    "/var"  = { fsType = "zfs"; device = "zpool/root/var"; };
  };
  boot.initrd.secrets = {
    "/boot/pass.key" = "/boot/pass.key";
  };

  services.zfs = {
    autoScrub = {
      enable = true;
    };
  };
  networking = {
    hostId = "8262ca33"; # generated with head -c4 /dev/urandom | od -A none -t x4
    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 = "zrepl_backup/identity";
      user = "root";
      group = "root";
      permissions = "0400";
      text = config.myEnv.zrepl_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 = [
      ''
        0 0 * * * root journalctl -q --since="25 hours ago" -u postfix -t postfix/smtpd -g "immae.eu.*Recipient address rejected"
        # Need a way to blacklist properly
        # 0 0 * * * root journalctl -q --since="25 hours ago" -u postfix -t postfix/smtpd -g "NOQUEUE:"
        0 0 * * * root journalctl -q --since="25 hours ago" -u postfix -t postfix/smtp -g "status=bounced"
      ''
    ];
  };

  fileSystems."/var/lib/pub/immae/devtools" = {
    device = "/run/current-system/sw/bin/bindfs#/var/lib/ftp/devtools.immae.eu/";
    fsType = "fuse";
    options = [ "force-user=pub" "create-for-user=wwwrun" "create-for-group=wwwrun" ];
  };
  environment.systemPackages = [ pkgs.bindfs ];

  services.zrepl = {
    enable = true;
    config = let
      redis_dump = pkgs.writeScript "redis-dump" ''
        #! ${pkgs.stdenv.shell}
        ${pkgs.redis}/bin/redis-cli bgsave
      '';
    in ''
      jobs:
        - type: push
          # must not change
          name: "backup-to-dilion"
          filesystems:
            "zpool/root": true
            "zpool/root/etc": true
            "zpool/root/var<": true
          connect:
            type: ssh+stdinserver
            host: dilion.immae.eu
            user: backup
            port: 22
            identity_file: ${config.secrets.fullPaths."zrepl_backup/identity"}
          snapshotting:
            type: periodic
            prefix: zrepl_
            interval: 15m
            hooks:
              - type: mysql-lock-tables
                dsn: "${config.myEnv.zrepl_backup.mysql.user}:${config.myEnv.zrepl_backup.mysql.password}@tcp(localhost)/"
                filesystems:
                  "zpool/root/var": true
              - type: command
                path: ${redis_dump}
                err_is_fatal: false
                filesystems:
                  "zpool/root/var": true
          send:
            encrypted: true
          pruning:
            keep_sender:
              - type: not_replicated
              - type: regex
                regex: "^manual_.*"
              - type: grid
                grid: 1x1h(keep=all) | 24x1h | 7x1d | 4x7d | 6x30d
                regex: "^zrepl_.*"
            keep_receiver:
              - type: regex
                regex: "^manual_.*"
              - type: grid
                grid: 1x1h(keep=all) | 24x1h | 7x1d | 4x7d | 6x30d
                regex: "^zrepl_.*"
    '';
  };
  # 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 = "20.03"; # Did you read the comment?
}