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)
    ./paseo.nix           # paseo daemon (web UI для CLI-агентов, systemd + npm global)
    ./nick.nix            # Nick timer prototype (systemd, localhost:8787)
    ./jupyter.nix         # JupyterLab (systemd, localhost:8890, лимиты)
    ./mesh-clients.nix    # Sol-style client pool (wg-clients1)
    ./mesh-egress.nix     # Sol-style selected-destination egress policy
  ];

  # 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;
    }
  ];

  # First server-to-server WireGuard backbone link: heather ↔ hyacinth.
  # The private key is generated on the live host and stays outside the flake.
  # Basic diagnostics/admin tools must be available even in non-login SSH
  # sessions (and not depend on a stale Home Manager profile).
  environment.systemPackages = with pkgs; [
    wireguard-tools
    tmux
    jq
    wget
    python3
  ];

  # NixOS uses scripted networking here (not systemd-networkd), so create the
  # dummy identity interface through a small idempotent systemd unit.
  systemd.services.mesh-identity = {
    description = "Create mesh identity interface";
    wantedBy = [ "network.target" ];
    after = [ "wireguard-wg-mesh.service" "network-addresses-wg-mesh.service" ];
    wants = [ "wireguard-wg-mesh.service" ];
    serviceConfig = {
      Type = "oneshot";
      RemainAfterExit = true;
      ExecStart = pkgs.writeShellScript "mesh-identity-up" ''
        set -eu
        ${pkgs.iproute2}/bin/ip link show mesh0 >/dev/null 2>&1 || ${pkgs.iproute2}/bin/ip link add mesh0 type dummy
        ${pkgs.iproute2}/bin/ip addr replace 10.0.0.1/32 dev mesh0
        ${pkgs.iproute2}/bin/ip link set mesh0 up
      '';
      ExecStop = "${pkgs.iproute2}/bin/ip link del mesh0";
    };
  };

  networking.wireguard.interfaces.wg-mesh = {
    ips = [ "10.99.0.1/30" ];
    listenPort = 51820;
    privateKeyFile = "/var/lib/wireguard/wg-mesh.key";
    # Keep WG as transport/crypto ACL; install the identity route explicitly below.
    allowedIPsAsRoutes = false;
    peers = [
      {
        publicKey = "BxTH8+MiA8Hv48UfpWJDVXIhbO5HgO2KTBEXIqqr23k=";
        # Match all destinations for future policy routes; allowedIPsAsRoutes=false
        # keeps this from installing a default route automatically.
        allowedIPs = [ "0.0.0.0/0" ];
        endpoint = "195.242.119.59:51820";
        persistentKeepalive = 25;
      }
    ];
  };

  networking.interfaces.wg-mesh.ipv4.routes = [
    { address = "10.0.0.2"; prefixLength = 32; }
  ];

  # Needed later when this node becomes a transit/exit peer.
  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;

  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)
      3478    # coturn TURN (tcp+udp)
      8443    # xray VLESS+Reality (публичный прокси)
      51820   # WireGuard mesh backbone
    ];
    firewall.allowedUDPPorts = [
      51820   # WireGuard mesh backbone
      22000   # syncthing sync (QUIC)
      10000   # jitsi jvb (RTP media)
      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";
}