nix-config/outputs/x86_64-linux/tests/idols-aquamarine/expr.nix

{
  myvars,
  outputs,
  lib,
  ...
}:
let
  eval = outputs.nixosConfigurations.aquamarine;
  cfg = eval.config;
  inherit (myvars.networking.hostsAddr.aquamarine) ipv4;
in
{
  # A server configuration is named after the bare hostname (no `-niri`).
  hostNameIsBare = cfg.networking.hostName == "aquamarine";

  # The two Radeon AI PRO R9700 cards: driver and the IOMMU mode ROCm needs for multi-GPU.
  amdgpuDriverLoaded = builtins.elem "amdgpu" cfg.boot.kernelModules;
  iommuPassthrough = builtins.elem "iommu=pt" cfg.boot.kernelParams;
  # This board's ACPI firmware cannot power the dGPU back on, and amdgpu throws
  # the error away, so the card dies on its first idle resume (./ROCM.md, WA-032).
  runtimePmDisabled = builtins.elem "amdgpu.runpm=0" cfg.boot.kernelParams;

  # An unattended host recovers a hung card itself instead of waiting for a reboot.
  gpuRecoveryEnabled = builtins.elem "amdgpu.gpu_recovery=1" cfg.boot.kernelParams;
  deepCStatesAllowed = !(builtins.elem "processor.max_cstate=2" cfg.boot.kernelParams);
  cpuEppConfigured =
    lib.attrByPath [
      "devices"
      "system"
      "cpu"
      "cpu[0-9]*"
      "cpufreq"
      "energy_performance_preference"
    ] null cfg.boot.kernel.sysfs == "balance_power";

  # Aqua uses native IPv6; the gateway returns real AAAA records instead of
  # requiring a host-local IPv4 precedence workaround.
  nativeIpv6Preference =
    !(cfg.environment.etc ? "gai.conf")
    || !lib.hasInfix "precedence ::ffff:0:0/96 100" cfg.environment.etc."gai.conf".text;

  # The Strata checkout lives under ~/src, which has to survive the tmpfs root
  # like ~/codes does.
  sourceCheckoutsPersistent = builtins.any (
    d: d.directory == "/home/${myvars.username}/src"
  ) cfg.preservation.preserveAt."/persistent".users.${myvars.username}.directories;

  # A cold flake cache re-downloads the input of a `nix run <flake-ref>` at boot.
  cachePersistent = builtins.any (
    d: d.directory == "/home/${myvars.username}/.cache"
  ) cfg.preservation.preserveAt."/persistent".users.${myvars.username}.directories;

  # Directories the tmpfs root would otherwise drop.
  userUnitDirsPersistent =
    let
      dirs = cfg.preservation.preserveAt."/persistent".users.${myvars.username}.directories;
    in
    builtins.all (path: builtins.any (d: d.directory == "/home/${myvars.username}/${path}") dirs) [
      ".config/systemd/user"
      ".config/containers/systemd"
    ];
  rootlessPodmanEnabled = cfg.virtualisation.podman.enable;

  latestKernel =
    cfg.boot.kernelPackages.kernel.version == eval.pkgs.linuxPackages_latest.kernel.version;
  btopShowsRadeon = cfg.modules.btop.package == eval.pkgs.btop-rocm;
  # CAP_PERFMON inside the wrapper is what the i915 iGPU needs.
  btopReadsIgpu = cfg.modules.btop.perfmon;
  # The iGPU takes video work off the R9700s: VA-API, oneVPL and OpenCL/Level-Zero.
  igpuMediaStackInstalled =
    let
      packageNames = map (package: package.pname or "") (cfg.hardware.graphics.extraPackages or [ ]);
    in
    builtins.all (name: builtins.elem name packageNames) [
      "intel-media-driver"
      "vpl-gpu-rt"
      "intel-compute-runtime"
    ];
  rocmOpenclIcdOnly =
    let
      graphics = cfg.hardware.graphics.extraPackages;
    in
    builtins.elem eval.pkgs.rocmPackages.clr.icd graphics
    && !builtins.elem eval.pkgs.rocmPackages.clr graphics;
  gpuMetricsExported = builtins.elem "drm" cfg.services.prometheus.exporters.node.enabledCollectors;
  raplMetricsExported = builtins.elem "rapl" cfg.services.prometheus.exporters.node.enabledCollectors;
  raplPermissionsExposed = lib.hasInfix "chgrp rapl" cfg.services.udev.extraRules;
  # node_exporter rejects a repeated flag, and this list merges with the base
  # module's entries, so a duplicate restart-loops the unit.
  collectorFlagsUnique =
    builtins.length (cfg.services.prometheus.exporters.node.enabledCollectors)
    == builtins.length (lib.unique cfg.services.prometheus.exporters.node.enabledCollectors);
  inferenceUserCanRender = builtins.elem "render" cfg.users.users.${myvars.username}.extraGroups;

  # Headless: no desktop session, no Home Manager.
  noHomeManager = !cfg ? home-manager.users;
  pythonInstalled = builtins.any (
    package: lib.hasPrefix "python3-" (package.name or "")
  ) cfg.environment.systemPackages;

  # The board renames the wired NIC with the PCIe topology, so networkd matches the
  # `en*` prefix; a name-based match leaves the host without an address.
  staticAddressMatchesWiredInterface =
    builtins.elem "${ipv4}/24" cfg.systemd.network.networks."10-lan".networkConfig.Address
    && cfg.systemd.network.networks."10-lan".matchConfig.Name == [ "en*" ];

  # Ephemeral root with the persistent volume required at boot, as on `ai`.
  rootIsTmpfs = cfg.fileSystems."/".fsType or null == "tmpfs";
  stateIsPersistent = cfg.fileSystems."/persistent".neededForBoot or false;

  # Install step 4 of ./README.md depends on this mapper name staying put.
  luksMapperNamed = builtins.attrNames cfg.boot.initrd.luks.devices == [ "aqua-luks" ];
}