# Edit this configuration file to define what should be installed on
# your system.  Help is available in the configuration.nix(5) man page
# and in the NixOS manual (accessible by running ‘nixos-help’).

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

{
  imports =
    [ # Include the results of the hardware scan.
      ./odin/hw.nix
      ./users.nix
      ./custom/uucp.nix
      ./custom/uucp-mediaserver.nix
      ./custom/borgbackup.nix
      ./custom/motion.nix
      ./custom/unit-status-mail.nix
      ./custom/zsh.nix
      ./utils/nix/module.nix
    ];

  # Use the GRUB 2 boot loader.
  boot.loader.grub.enable = true;
  boot.loader.grub.version = 2;
  # Define on which hard drive you want to install Grub.
  boot.loader.grub.device = "/dev/disk/by-id/ata-MKNSSDCR60GB_MK130619AS1031770";

  boot.extraTTYs = [ "tty7" ];

  boot.initrd.network = {
    enable = true;
    ssh = {
      enable = true;
      authorizedKeys = [ (builtins.readFile ./users/keys/gkleen-hel-rsa.pub) ];
    };
  };

  networking.hostName = "odin"; # Define your hostname.

  # Select internationalisation properties.
  i18n = {
    consoleKeyMap = "dvp";
    defaultLocale = "en_US.UTF-8";
  };

  # Set your time zone.
  time.timeZone = "Europe/Berlin";

  environment.systemPackages = with pkgs; [
    pythonPackages.magic-wormhole
    tmux
    mosh
    quota
    git
    samba
    ntfs3g
    rebuild-system
    monitor-uucp
  ];

  services.openssh = {
    enable = true;
    passwordAuthentication = false;
    challengeResponseAuthentication = false;
    extraConfig = ''
      AllowGroups ssh
    '';
  };
  users.groups."ssh" = {
    members = ["uucp" "root"];
  };

  networking.firewall = {
    enable = true;
    allowPing = true;
    allowedTCPPorts = [ 22 # ssh
                        139 445 # samba
                        2010 2011 # notmuch-tcp
                        5001 # iperf
                      ];
    allowedTCPPortRanges = [ { from = 8080; to = 8080; } # motion
                           ];
    allowedUDPPorts = [ 137 138 # samba
                      ];
    allowedUDPPortRanges = [ { from = 60000; to = 61000; } # mosh
                           ];
  };

  users.extraUsers.root = let
      template = import ./users/gkleen.nix;
    in {
      inherit (template) shell;
      openssh.authorizedKeys.keyFiles = template.openssh.authorizedKeys.keyFiles;
    };

  services.journald = {
    rateLimitBurst = 0;
    console = "/dev/tty7";
  };

  services.haveged.enable = true;

  services.uucp = {
    enable = true;
    nodeName = "odin";
    remoteNodes = {
      "ymir" = {
        publicKeys = ["ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIGANj+LJ4CI6VrAgBRocKCGq74kZnwD1PdKr/gdlfVr1 uucp@ymir"];
        hostnames = ["ymir.yggdrasil.li" "ymir.niflheim.yggdrasil"];
        commands = ["rmail"];
      };
      "hel" = {
        publicKeys = ["ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIKD8ycFGfVkBL9wjA5Kc33cl6Qt5K2505G/38oH8Cy/e uucp@hel"];
        hostnames = ["hel.asgard.yggdrasil" "hel.faraday.asgard.yggdrasil" "hel.midgard.yggdrasil"];
        commands = ["rmail" "recv"];
      };
    };

    media-server = {
      enable = true;
      remoteNodes = [ "hel" ];
    };

    commandPath = [ "${pkgs.rmail}/bin" config.security.wrapperDir ];
  };

  programs.recv.enable = true;

  users.groups."media" = {
    members = [ "uucp" ];
  };

  services.postfix = {
    enable = true;
    enableSmtp = false;
    enableSubmission = false;
    setSendmail = true;
    networksStyle = "host";
    hostname = "odin.asgard.yggdrasil";
    recipientDelimiter = "+";
    postmasterAlias = "gkleen";
    rootAlias = "gkleen";
    extraAliases = ''
      uucp: gkleen
    '';

    virtual = ''
      @hel gkleen
    '';

    destination = [
      ''regexp:${pkgs.writeText "destination" ''
          /\.?localdomain$/ ACCEPT
          /^localhost$/ ACCEPT
          /\.?odin(\.asgard\.yggdrasil)?$/ ACCEPT
        ''}
      ''
      ];
    config = {
      default_transport = "uucp:ymir";

      message_size_limit = "0";
      mailbox_size_limit = "0";

      mail_spool_directory = "/srv/mail";

      luser_relay = ''postmaster''${recipient_delimiter}''${local:unknown}'';
    };

    masterConfig = {
      uucp = {
        type = "unix";
        private = true;
        privileged = true;
        chroot = false;
        command = "pipe";
        args = [ "flags=Fqhu" "user=uucp" ''argv=${config.security.wrapperDir}/uux -z -a $sender - $nexthop!rmail ($recipient)'' ];
      };
    };

    networks = ["127.0.0.0/8" "[::ffff:127.0.0.0]/104" "[::1]/128" "10.141.0.0/16"];
  };

  services.borgbackup = {
    snapshots = "lvm";
    prefix = "yggdrasil.asgard.odin.";
    targets = {
      "munin" = {
        repo = "borg.munin:borg";
        paths = [
          { VG = "raid6"; LV = "mail"; }
          { VG = "raid6"; LV = "home"; }
          { VG = "raid6"; LV = "media"; }
          { VG = "raid6"; LV = "root"; }
          { VG = "ssd-raid1"; LV = "root"; }
        ];

        prune = lib.genAttrs
          ["raid6/mail" "raid6/home" "raid6/media" "raid6/root" "ssd-raid1/root"]
          (name: [
            "--keep-within" "24H"
            "--keep-daily" "31"
            "--keep-monthly" "12"
            "--keep-yearly" "-1"
          ]);
      };
    };
  };

  services.samba = {
    enable = true;
    shares = {
      homes = {
        comment = "Home Directories";
        browseable = true;
        "valid users" = "%S";
        writable = true;
      };

      eos = {
        comment = "Disk image of eos";
        browseable = true;
        "valid users" = "mherold";
        writable = true;
        path = "/srv/eos";
      };

      media = {
        browseable = true;
        writable = false;
        path = "/srv/media";
        "guest ok" = true;
        "guest only"  = true;
      };
    };
    extraConfig = ''
      domain master = yes
      workgroup = ASGARD
      load printers = no
      printing = bsd
      printcap name = /dev/null
      disable spoolss = yes
      guest account = nobody
    '';
  };

  fileSystems."/srv/eos.lower" = {
    device = "/dev/disk/by-uuid/2A3052E73052BA11";
    fsType = "ntfs-3g";
    options = ["ro" "uid=1001" "gid=100" "fmask=0177" "dmask=0077" "permissions"];
  };

  systemd.mounts = [
    {
      wantedBy = [ "samba-smbd.service" ];
      before = [ "samba-smbd.service" ];
    
      where = "/srv/eos";
      what = "overlay";
      type = "overlay";
      options = lib.concatStringsSep ","
        [ "lowerdir=/srv/eos.lower"
          "upperdir=/home/mherold/.eos.upper"
          "workdir=/home/mherold/.eos.work"
        ];

      unitConfig = {
        RequiresMountsFor = [ "/srv/eos.lower" "/home/mherold/.eos.upper" "/home/mherold/.eos.work" ];
      };
    }
  ];

  services.motion = {
    cameras = [
      {
        extraConfig = ''
          camera_name cat-food

          netcam_url mjpeg://ipcam01.hlidskjalf.yggdrasil:80/mjpeg.cgi
          netcam_keepalive on
          width 640
          height 480

          stream_port 8080

          despeckle_filter EedDl
          threshold_tune on
          noise_tune on
          lightswitch 50
          minimum_motion_frames 5
        '';
        configFiles = [ "/etc/motion/cat-food.secret" ];
      }
    ];

    extraConfig = ''
      text_left "%$\n%F %T %Z"
      text_right ""
      text_changes off

      event_gap 20

      output_pictures off

      ffmpeg_output_movies on
      ffmpeg_video_codec mkv
      ffmpeg_bps 500000
      max_movie_time 600

      target_dir /srv/hlidskjalf
      movie_filename %Y-%m-%d/%H-%M-%S.%$

      stream_localhost off
      stream_auth_method 1

      stream_quality 80
      stream_maxrate 100
      stream_motion on

      webcontrol_port 0
      ipv6_enabled on
    '';

    configFiles = [ "/etc/motion/motion.secret" ];
  };

  users.groups."hlidskjalf" = {
    members = [ "motion" "uucp" ];
  };

  virtualisation.libvirtd = {
    enable = true;
  };

  services.rollingDirectories = [
    { path = "/srv/hlidskjalf";
      maxSize = "20Gi";
    }
  ];

  security.polkit = {
    enable = true;
    extraConfig = ''
      polkit.addRule(function(action, subject) {
        if (    action.id == "org.freedesktop.systemd1.manage-units"
             && subject.isInGroup("wheel")
           ) {
            return polkit.Result.YES;
        }
      });
    '';
  };

  programs.ssh = {
    startAgent = true;
    agentTimeout = "1h";
  };

  nix = {
    daemonIONiceLevel = 3;
    daemonNiceLevel = 10;
    gc = {
      automatic = true;
      options = "--delete-older-than 21d";
    };
    autoOptimiseStore = true;
  };

  services.smartd = {
    enable = true;
    autodetect = false;
    devices = map (id: { device = "/dev/disk/by-id/" + id; })
      [ "ata-MKNSSDCR60GB_MK130620AS1032639"
        "ata-MKNSSDCR60GB_MK130619AS1031770"
        "ata-WDC_WD20EFRX-68AX9N0_WD-WMC301206808"
        "ata-WDC_WD20EFRX-68AX9N0_WD-WMC300900004"
        "ata-WDC_WD20EZRX-00D8PB0_WD-WMC4M0FA7MUY"
        "ata-WDC_WD20EARX-00PASB0_WD-WCAZA8424566"
        "ata-ST2000VN000-1HJ164_W7201QX1"
        "nvme-KINGSTON_SKC1000240G_50026B728204C4FC"
      ];
    notifications = {
      mail.enable = true;
      wall.enable = true;
    };
    defaults.monitored = "-a -n standby,10 -o on -s (S/../.././02|L/../../7/04)";
    extraOptions = [ "--interval=600" "-A" "/var/log/smart/" "-s" "/var/lib/smart/" ];
  };

  systemd.services."iperf-tcp" = {
    wantedBy = [ "multi-user.target" ];
    serviceConfig = {
      ExecStart = "${pkgs.iperf2}/bin/iperf -sV";
    };
  };

  systemd.services."iperf-udp" = {
    wantedBy = [ "multi-user.target" ];
    serviceConfig = {
      ExecStart = "${pkgs.iperf2}/bin/iperf -suV";
    };
  };

  systemd.status-mail = {
    recipient = "root@odin.asgard.yggdrasil";
    onFailure = [ "nixos-upgrade"
                  "borgbackup-munin@" "borgbackup-prune-munin"
                  "smartd"
                ];
  };

  system.autoUpgrade.enable = true;
  system.nixos.stateVersion = "18.09";

  systemd.services."nixos-upgrade" = {
    path = with pkgs; [ git ];
    preStart = ''
      git -C /etc/nixos pull --recurse-submodules
    '';
  };
}