nix-config/hosts/heather/default.nix

# heather — сервер на Yandex Cloud (NixOS 26.11).
# https://git.iscg.dev/mikl/nix-config
#
# Перенесено из muscari (переименование 2026-07-11).
# VM на Yandex Cloud, 2 vCPU / 8 GB / 64 GB SSD (network-ssd), Legacy BIOS.
# Образ NixOS собирается как qcow2 (см. ./image.nix, make-disk-image.nix) и
# заливается как boot disk в YC. НЕ через nixos-anywhere — kexec на YC хрупкий.
# См. memory/yandex-nixos-qcow2.md.
#
# Архитектура (2026-07-12, заменила k3s):
#   Caddy (edge, TLS) → host-сервисы (syncthing) + docker-контейнеры (arion)
#   Cilium/k3s выключены — overhead 1.3 GB был неоправдан для single-node.
# См. ./docker.nix, ./caddy.nix, ./syncthing.nix, ./arion-compose.nix.

{ config, pkgs, lib, ... }:
{
  imports = [
    ./image.nix           # YC guest profile + qcow2 build target
    ./docker.nix          # docker + arion CLI (контейнеры)
    ./caddy.nix           # edge proxy, TLS, роутинг по доменам
    ./syncthing.nix       # sync + relay
    ./tuwunel-admin.nix   # matrix admin web UI (systemd, статический бинарник)
    ./nick.nix            # Nick timer prototype (systemd, localhost:8787)
    # Jupyter is intentionally disabled until it has a separate service identity.
    # Keep its venv, notebooks and external credentials untouched.
    ./astrnet.nix        # AstrNet (Sol): two WireGuard legs, FRR/BGP, ingress guard
    ./minecraft-api.nix  # mesh-only typed Minecraft API, isolated DynamicUser
  ];

  # Heather has 8 GiB RAM and runs several containers. Keep a 4 GiB
  # swapfile so a transient application spike does not take down the host.
  swapDevices = [
    {
      device = "/var/swapfile";
      size = 4096;
    }
  ];

  # WireGuard tooling is also used by AstrNet. Keep this package and the
  # diagnostics tools available in non-login SSH sessions.
  environment.systemPackages = with pkgs; [
    wireguard-tools
    tmux
    jq
    wget
    python3
  ];

  # Static public pages used by the personal gcalcli OAuth application.
  environment.etc = {
    "gcalcli-site/index.html".source = ./gcalcli-site/index.html;
    "gcalcli-site/privacy.html".source = ./gcalcli-site/privacy.html;
    "gcalcli-site/terms.html".source = ./gcalcli-site/terms.html;
    "gcalcli-site/style.css".source = ./gcalcli-site/style.css;
  };

  # Docker requires forwarding; AstrNet ingress is blocked by astrnet-guard.
  boot.kernel.sysctl."net.ipv4.ip_forward" = 1;

  # Arion-проект как systemd-сервис: arion-compose.nix → docker-compose → up.
  # NB: settings — это модуль с imports, НЕ `import ./arion-compose.nix`.
  virtualisation.arion.backend = "docker";
  virtualisation.arion.projects.heather = {
    serviceName = "heather";   # systemd: heather.service
    settings = {
      imports = [ ./arion-compose.nix ];
    };
  };
  # Applying the NixOS configuration must not run `arion up` for *all* services:
  # in particular it would start the intentionally stopped Teable stack and
  # touch production Matrix. After changing an image, update that one service
  # explicitly with `arion --prebuilt-file <active-unit-compose> up -d --no-deps SERVICE`.
  systemd.services.heather.restartIfChanged = false;

  # The public dashboard is navigation only, never a Docker administration client.
  assertions = [
    {
      assertion = let
        services = config.virtualisation.arion.projects.heather.settings.services;
      in !(services ? dockerproxy) && lib.all
        (service: lib.all (mount: !(lib.hasInfix "docker.sock" mount)) service.service.volumes)
        (lib.attrValues services);
      message = "Heather web stack must not expose Docker socket access or a dockerproxy service.";
    }
  ];

  networking = {
    hostName = "heather";
    # Firewall выключен в ./image.nix (полагаемся на YC Security Groups).
    # Порты тут только для документации — реально открывает YC SG.
    firewall.allowedTCPPorts = [
      22      # SSH
      80      # HTTP (Caddy → redirect to HTTPS)
      443     # HTTPS (Caddy, TLS termination)
      2222    # forgejo git ssh (публично)
      22000   # syncthing sync
      22067   # strelaysrv (relay)
      22070   # strelaysrv (status)
      7881    # MatrixRTC LiveKit ICE/TCP
      3478    # coturn TURN (tcp+udp)
    ];
    firewall.allowedUDPPorts = [
      22000   # syncthing sync (QUIC)
      10000   # jitsi jvb (RTP media)
      7882    # MatrixRTC LiveKit ICE/UDP mux
      3478    # coturn TURN
    ];
    # coturn RTP relay range
    firewall.allowedUDPPortRanges = [
      { from = 49152; to = 65535; }  # coturn RTP relay
    ];
  };
  # useDHCP задаёт ./image.nix (mkDefault) — облачный профиль.

  # SSH ключи для mikl: forgejo .keys endpoint с sha256-pinning.
  # Poppy-ключ (этот ноутбук) лежит там последней строкой.
  users.users.mikl.openssh.authorizedKeys.keyFiles = [
    (pkgs.fetchurl {
      url = "https://git.iscg.dev/mikl.keys";
      sha256 = "sha256-Omc/3NJn0nM8SWeF33trFwOAVgSX0fXB5dfEakcRoTA=";
    })
  ];

  # Rescue-канал: root с тем же poppy-ключом. PermitRootLogin = prohibit-password
  # (см. image.nix) пускает root только по ключу — парольного root-логина нет.
  # Нужен, чтобы не оказаться запертым без root, если passwordless sudo сломается
  # (как произошло на первом образе heather): ssh root@heather и nixos-rebuild.
  users.users.root.openssh.authorizedKeys.keyFiles = [
    (pkgs.fetchurl {
      url = "https://git.iscg.dev/mikl.keys";
      sha256 = "sha256-Omc/3NJn0nM8SWeF33trFwOAVgSX0fXB5dfEakcRoTA=";
    })
  ];

  # После первой установки 25.11 не трогаем (NixOS convention)
  system.stateVersion = "25.11";
}