# 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, lib, pkgs, ... }:

{
  imports =
    [ # Include the results of the hardware scan.
      ./hel/hw.nix
      ./hel/boot.nix
      ./users.nix
      ./custom/zsh.nix
      ./custom/tinc/def.nix
      ./custom/tinc/yggdrasil.nix
      ./custom/uucp.nix
      ./custom/btrfs-snapshots.nix
    ];

  system.stateVersion = "16.09";

  networking = {
    hostName = "hel";
    domain = "midgard.yggdrasil";

    hosts = {
      "127.0.0.1" = [ "hel.midgard.yggdrasil" "hel" ];
      "::1" = [ "hel.midgard.yggdrasil" "hel" ];
    };
    
    firewall = {
      enable = true;
      allowedTCPPorts = [ 22 # ssh
                        ];
    };

    networkmanager = {
      enable = true;
      unmanaged = [ "docker0" ];
    };
  };

  systemd.services.ModemManager = {
    enable = true;
    wantedBy = [ "network.target" ];
  };

  powerManagement.enable = true;

  i18n = {
    consoleFont = "lat9w-16";
    consoleKeyMap = "dvp";
    defaultLocale = "en_US.UTF-8";
  };

  boot.kernelPackages = pkgs.linuxPackages_latest;
  # boot.kernelPatches = [
  #     { patch = ./patches/udl.patch;
  #       name = "udl-vblank";
  #     }
  #   ];

  environment.systemPackages = with pkgs; [
    git
    slock
    shadow
    (callPackage ./utils/nix/rebuild-system.nix {})
    rewacom
    autorandr
    ntfs3g
    exfat
  ];

  nixpkgs.config.packageOverrides = pkgs: rec {
    rewacom = pkgs.writeScriptBin "rewacom" ''
      #!${pkgs.stdenv.shell}
      modprobe -r wacom
      modprobe wacom
    '';

    samsung-unified-linux-driver = pkgs.stdenv.lib.overrideDerivation pkgs.samsung-unified-linux-driver (oldAttrs: {
      buildInputs = oldAttrs.buildInputs ++ [ pkgs.makeWrapper ];
      builder = pkgs.writeScript "builder.sh" ''
        #!${pkgs.stdenv.shell}

        source ${pkgs.stdenv}/setup

        ${oldAttrs.builder} ${pkgs.lib.concatStringsSep " " oldAttrs.args}

        export PATH=${pkgs.makeWrapper}/bin:$PATH
      
        echo "Wrapping samsung filters"
        wrapProgram $out/lib/cups/filter/rastertosamsungspl \
          --prefix PATH : ${pkgs.ghostscript}/bin
        wrapProgram $out/lib/cups/filter/rastertosamsungsplc \
          --prefix PATH : ${pkgs.ghostscript}/bin
      '';
    });
  };

  nixpkgs.config.allowUnfree = true;

  virtualisation.docker = {
    enable = true;
    autoPrune.enable = true;
    enableOnBoot = false;
  };

  services = {
    vnstat = {
      enable = true;
    };

    journald = {
      rateLimitBurst = 0;
    };
   
    gpsd = {
      enable = true;
      debugLevel = 3;
      device = "/dev/gps0";
      readonly = false;
    };

    logind.extraConfig = ''
      HandleLidSwitch=sleep
      HandleSuspendKey=sleep
      LidSwitchIgnoreInhibited=no
    '';

    openssh = {
      enable = true;
      extraConfig = ''
        Match User media
          ForceCommand internal-sftp
          PermitTTY no
          AllowTcpForwarding no
          AllowStreamLocalForwarding no
          X11Forwarding no
          AllowAgentForwarding no
          ChrootDirectory /run/%u
          AuthorizedKeysFile /etc/ssh/authorized_keys.d/%u
      '';
    };

    atd = {
      enable = true;
      allowEveryone = true;
    };

    xserver = {
      enable = true;
      
      layout = "us";
      xkbVariant = "dvp";
      xkbOptions = "compose:caps";
      
      displayManager.slim = {
        enable = true;
        defaultUser = "gkleen";
      };

      desktopManager = {
        default = "none";
        xterm.enable = false;
      };

      windowManager = {
        default = "xmonad";
        xmonad = {
          enable = true;
          extraPackages = haskellPackages: (with haskellPackages; [ xmonad-contrib hostname libnotify aeson temporary parsec network taffybar ]);
        };
      };

      wacom.enable = true;
      multitouch.enable = true;

      dpi = 210;
    };

    ntp.enable = false;
    timesyncd.enable = false;

    chrony = {
      enable = true;
      extraConfig = ''
        refclock SOCK /var/run/chrony.gps0.sock refid GPS
      '';
    };

    yggdrasilTinc = {
      enable = true;
      connect = true;
      name = "hel";
      interfaceConfig = {
        ip4 = [ { address = "10.141.2.3"; prefixLength = 16; } ];
      };
    };

    uucp = {
      enable = true;
      nodeName = "hel";
      remoteNodes = ["isaac" "ymir"]; # legacy name for odin
      sshUser = {
        openssh.authorizedKeys.keys = [ ''no-port-forwarding,no-X11-forwarding,no-agent-forwarding,command="${config.security.wrapperDir}/uucico" ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFH1QWdgoC03nzW5GBuCl2pqASHeIXIYtE9IInHdaKcO uucp@ymir''
	                                ''no-port-forwarding,no-X11-forwarding,no-agent-forwarding,command="${pkgs.writeScript "odin.sh" "#!${pkgs.stdenv.shell}\necho .\nexec -a uucico ${config.security.wrapperDir}/uucico\n"}" ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIJhACtnt9+3j2ev4QVA2QBlPtblPnu7yol2njgfMlHtC uucp@odin''
                                      ];
      };
      sshConfig = ''
        Host isaac
          Hostname odin.asgard.yggdrasil
          IdentityFile ~/.ssh/odin
	Host ymir
	  Hostname ymir.niflheim.yggdrasil
	  IdentityFile ~/.ssh/ymir
      '';
      commandPath = [ "${pkgs.callPackage ./hel/recv-media.nix {}}/bin" config.security.wrapperDir ];
      defaultCommands = [];
      commands = {
        "isaac" = ["recv-media" "notify-gkleen"];
      };
      protocols = {
        "isaac" = "t";
      };
    };
    
    postfix = {
      enable = true;
      enableSmtp = true;
      enableSubmission = false;
      setSendmail = true;
      networksStyle = "host";
      hostname = "hel.midgard.yggdrasil";
      destination = [];
      relayHost = "uucp:ymir";
      recipientDelimiter = "+";
      extraMasterConf = ''
        uucp        unix - n n - - pipe flags=Fqhu user=uucp argv=${config.security.wrapperDir}/uux -z -a $sender - $nexthop!rmail ($recipient)
        sshsendmail unix - n n - - pipe flags=Fq user=postfix_ssh argv=${pkgs.openssh}/bin/ssh -F /var/db/postfix_ssh/ssh.config $nexthop sendmail -f $sender -G $recipient
      '';
      transport = ''
        gkleen+sent@yggdrasil.li uucp:isaac
      '';
      extraConfig = ''
        always_bcc = gkleen+sent@yggdrasil.li
      
        default_transport = uucp:ymir

        inet_interfaces = loopback-only
      
        authorized_submit_users = !uucp, static:anyone
        message_size_limit = 0

        sender_dependent_default_transport_maps = regexp:${pkgs.writeText "sender_relay" ''
          /@math(ematik)?\.(lmu|uni-muenchen)\.de$/ sshsendmail:math60.mathinst.loc
          /@(cip|stud)\.ifi\.(lmu|uni-muenchen)\.de$/ smtp:smtp.ifi.lmu.de
          /@campus\.lmu\.de$/ smtp:postout.lrz.de
        ''}

        smtp_sasl_auth_enable = yes
        smtp_sender_dependent_authentication = yes
        smtp_sasl_tls_security_options = noanonymous
        smtp_tls_security_level = dane
        smtp_sasl_password_maps = texthash:/var/db/postfix/sasl_passwd
        smtp_cname_overrides_servername = no
        smtp_always_send_ehlo = yes

        smtp_tls_loglevel = 1
        smtp_dns_support_level = dnssec
      '';
    };

    printing = {
      enable = true;
      drivers = with pkgs; [ samsung-unified-linux-driver ];
    };

    upower = {
      enable = true;
    };

    locate = {
      enable = true;
      interval = "hourly";
      locate = pkgs.mlocate;
      localuser = null;
      prunePaths = ["/tmp" "/var/tmp" "/var/cache" "/var/lock" "/var/run" "/var/spool"];
    };

    dbus = {
      enable = true;
      packages = [ (pkgs.writeTextFile {
                      name = "eavesdrop.conf";
                      text = ''
                        <!DOCTYPE busconfig PUBLIC
                        "-//freedesktop//DTD D-Bus Bus Configuration 1.0//EN"
                        "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
                        <busconfig>
                          <policy user="root">
                            <allow eavesdrop="true"/>
                            <allow eavesdrop="true" send_destination="*"/>
                          </policy>
                        </busconfig>
                      '';
                      destination = "/etc/dbus-1/system.d/eavesdrop.conf";
                    })
                 ];
    };
  };

  systemd.services."gpsd".wants = [ "chronyd.service" ];
  systemd.services."gpsd".after = [ "chronyd.service" ];

  users = {
    mutableUsers = false;
  
    extraUsers.root = { inherit (import ./users/gkleen.nix) shell hashedPassword; };

    extraUsers.gkleen.extraGroups = [ "media" "networkmanager" "docker" ];

    extraUsers.media = {
      group = "media";
      home = "/var/media";
      isSystemUser = true;
      openssh.authorizedKeys.keyFiles = [
        ./users/keys/gkleen-media-hel.pub
      ];
      useDefaultShell = true;
    };

    extraUsers.postfix_ssh = {
      isSystemUser = true;
      home = "/var/db/postfix_ssh";
    };

    extraGroups = {
      network = {};
      media = {
        members = [ "uucp" "media" ];
      };
    };
  };

  security = {
    sudo.extraConfig = ''
      Cmnd_Alias  SYSCTRL = /run/current-system/sw/sbin/shutdown, /run/current-system/sw/sbin/reboot, /run/current-system/sw/sbin/halt, /run/current-system/sw/bin/systemctl, ${pkgs.rewacom}/bin/rewacom
      %wheel ALL=(ALL) NOPASSWD: SYSCTRL
    '';

    wrappers = { "slock".source = "${pkgs.slock}/bin/slock";
                 "mount".source = "${pkgs.utillinux.bin}/bin/mount";
                 "umount".source = "${pkgs.utillinux.bin}/bin/umount";
                 "newgrp".source = "${pkgs.shadow}/bin/newgrp";
                 "sg".source = "${pkgs.shadow}/bin/sg";
                 "thinklight".source =
                   "${(pkgs.callPackage ./custom/thinklight.nix { thinklight = "kbd_backlight"; })}/bin/thinklight";
                 "notify-gkleen" = {
                   group = "users";
                   owner = "gkleen";
                   setgid = true;
                   setuid = true;
                   permissions = "u+rx,g+x,o+x";
                   source = ''${pkgs.callPackage ./custom/notify-user.nix { inherit (pkgs.haskellPackages) ghcWithPackages; }}/bin/notify-gkleen'';
                 };
               };

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

  time.timeZone = "Europe/Berlin";

  hardware = {
    pulseaudio = {
      enable = true;
      package = with pkgs; pulseaudioFull;
      support32Bit = true;
    };

    opengl = {
      enable = true;
      extraPackages = with pkgs; [ vaapiIntel libvdpau-va-gl vaapiVdpau ];
      driSupport32Bit = true;
    };

    bluetooth = {
      enable = true;   
      extraConfig = ''
        [General]
        Enable=Source,Sink,Media,Socket
      '';
    };

    # sane = {
    #   enable = true;
    #   extraBackends = with pkgs; [ samsung-unified-linux-driver ];
    #   configDir = "/etc/sane.d";
    # };

    sensor.iio.enable = true;
  };

  sound.enable = true;


  # nix.gc = {
  #   automatic = true;
  #   dates = "daily";
  #   options = "--delete-older-than 30d";
  # };

  nix = {
    useSandbox = true;
    autoOptimiseStore = true;
    daemonNiceLevel = 10;
    daemonIONiceLevel = 3;
  };

  environment.variables = {
    SSL_CERT_FILE = "/etc/ssl/certs/ca-certificates.crt";
    SANE_CONFIG_DIR = "/etc/sane.d";
    TPRINT_BASEURL = "http://bragi.asgard.yggdrasil/thermoprint/api";
    MPD_HOST = "bragi.asgard.yggdrasil";
    MPD_PORT = "6600";
  };

  environment.etc."X11/xorg.conf.d/50-wacom.conf".source = lib.mkForce ./hel/wacom.conf;

  environment.etc."sane.d/dll.conf".text = "xerox_mfp";
  environment.etc."sane.d/xerox_mfp.conf".text = "tcp printer.asgard.yggdrasil";

  systemd.services."kill-user@" = {
    serviceConfig = {
      Type = "oneshot";
      ExecStart = "${pkgs.systemd}/bin/loginctl kill-user %I";
    };
  };
  systemd.targets."sleep" = {
    after = [ "kill-user@uucp.service" ];
    wants = [ "kill-user@uucp.service" ];
  };

  systemd.automounts = [
    { enable = true;
      where = "/run/media/var/media";
      automountConfig = {
        DirectoryMode = "700";
      };
      wantedBy = [ "local-fs.target" ];
    }
  ];

  systemd.mounts = [
    { enable = true;
      where = "/run/media/var/media";
      what = "/var/media";
      type = "none";
      options = "bind";
      mountConfig = {
        DirectoryMode = "700";
      };
    }
  ];

  systemd.user.services."pulseaudio".enable = lib.mkForce false;
  systemd.user.services."ssh-agent".enable = lib.mkForce false;
  systemd.user.sockets."pulseaudio".enable = lib.mkForce false;

  systemd.services."ac-plugged" = {
    description = "Inhibit handling of lid-switch and sleep";

    path = with pkgs;
             [ systemd coreutils ];

    script = ''
      exec systemd-inhibit --what=handle-lid-switch:sleep --why="AC is connected" --mode=block sleep infinity
    '';
  
    serviceConfig = {
      Type = "simple";
    };
  };

  services.udev.extraRules = with pkgs; ''
    SUBSYSTEM=="power_supply", ENV{POWER_SUPPLY_ONLINE}=="0", RUN+="${systemd}/bin/systemctl --no-block stop ac-plugged.service"
    SUBSYSTEM=="power_supply", ENV{POWER_SUPPLY_ONLINE}=="1", RUN+="${systemd}/bin/systemctl --no-block start ac-plugged.service"

    KERNELS=="1-2:1.2", ENV{ID_MM_DEVICE_IGNORE}="1", SYMLINK+="gps0"
    KERNELS=="1-2:1.3", ENV{ID_MM_DEVICE_IGNORE}="1", SYMLINK+="gpsctl0", TAG+="systemd"
  '';

  systemd.services."gpscfg" = {
    description = "Configure GPS";

    script = ''
      printf 'AT!GPSTRACK=1,255,30,1000,1\r' > /dev/gpsctl0
    '';
  };

  systemd.timers."gpscfg" = {
    enable = true;

    bindsTo = [ "dev-gpscfg0.device" ];
    after = [ "dev-gpscfg0.device" ];

    wantedBy = [ "timers.target" ];

    timerConfig = {
      OnActiveSec = "0s";
      OnUnitInactiveSec = "5m";
    };
  };

  systemd.services."NetworkManager-wait-online".enable = true;

  services.btrfs-snapshots.enable = true;

  systemd.timers."backup-odin@home-gkleen" = {
    enable = true;

    wantedBy = [ "timers.target" ];

    timerConfig = {
      Persistent = true;
      OnUnitInactiveSec = "6h";
      OnBootSec = "6h";
    };
  };
  systemd.services."backup-odin@" = {
    enable = true;

    bindsTo = [ "btrfs-snapshot@%i.service" "network-online.target" ];
    after = [ "btrfs-snapshot@%i.service" "network-online.target" ];

    path = with pkgs; [borgbackup];

    script = ''
      borg create \
        --stats \
        --list \
        --filter 'AME' \
        --exclude-caches \
        --keep-exclude-tags \
        --patterns-from .backup \
        --one-file-system \
        --compression auto,lzma \
        borg.odin:/srv/backup/borg::yggdrasil.midgard.hel.$1-{utcnow}
    '';
    scriptArgs = "%i";

    serviceConfig = {
      Type = "oneshot";
      WorkingDirectory = "/mnt/snapshot-%i";
      Nice = 15;
      IOSchedulingClass = 2;
      IOSchedulingPriority = 7;
      SuccessExitStatus = [1 2];
    };
  };
}