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Merge pull request #363 from ryan4yin/fix/smartctl-exporter-describe-descriptors
chore(workarounds): add a registry; pin smartctl_exporter to the #329 fix
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@@ -59,6 +59,12 @@ deployments. Keep repository guidance here; reusable global rules live in `agent
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- Use `lib.mkDefault` for defaults and `lib.mkForce` only when necessary.
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- Give module options a `description` and preserve platform-specific conditions.
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## Workarounds
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Temporary workarounds, version pins, carried patches, and known gaps are recorded in
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[WORKAROUNDS.md](./WORKAROUNDS.md), each with a removal condition. Add a row in the same change that
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introduces one, and re-evaluate entries when their `Revisit` trigger comes up.
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## Command Hazards
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- `just eval-host <host>`, `just build-host <host>`, `just build-microvm <guest>`, and `just test`
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@@ -120,6 +126,7 @@ repository, and cross-link them — no need to be told.
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## Further Context
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- [Repository overview](./README.md)
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- [Workarounds & known gaps](./WORKAROUNDS.md)
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- [Outputs and tests](./outputs/README.md)
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- [Hosts](./hosts/README.md), [system modules](./modules/README.md), and
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[Home Manager](./home/README.md)
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@@ -0,0 +1,66 @@
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# Workarounds & known gaps
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Temporary workarounds, version pins, carried patches, and known gaps are collected here, grouped by
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type, each with the condition under which it can be removed. Review the list periodically so
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obsolete workarounds get rolled back instead of lingering.
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## How to use
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- **Adding** — a change that introduces a workaround, pin, carried patch, or known gap adds a row
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under the matching section below in the same PR, with a concrete **removal condition**.
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- **Removing** — once the removal condition is met, delete the change and set `Status` to `removed`
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(mention the ID in the commit), or delete the row.
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- **Reviewing** — re-evaluate rows whose `Revisit` trigger is due and refresh `Status`.
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## Pins
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A version or revision pinned for a reason that can go away.
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| ID | What & where | Why | Removal condition | Added | Revisit | Status |
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| ------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------- | ---------- | ---------------------- | ------ |
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| WA-001 | smartctl_exporter pinned to upstream `6274decc`, which carries PR [#329](https://github.com/prometheus-community/smartctl_exporter/pull/329) — `overlays/smartctl-exporter/` | `/metrics` returns HTTP 500 once a device becomes readable after startup ([#305](https://github.com/prometheus-community/smartctl_exporter/issues/305), [#326](https://github.com/prometheus-community/smartctl_exporter/issues/326)) | Drop once nixpkgs provides a version containing the #329 fix | 2026-10-03 | next nixpkgs bump | active |
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| WA-002 | `nixpkgs-2505` — `flake.nix`; consumer `home/base/tui/container.nix` | `kubernetes-helm` regressed in newer nixpkgs | Drop the input and its consumer once helm works again in current nixpkgs | 2025-12-03 | when helm is revisited | active |
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| WA-003 | `rust-overlay` follow — `flake.nix` | lanzaboote v1.1.0's pinned rust-overlay uses the deprecated `stdenv.isLinux`/`stdenv.isDarwin` | Drop the follow once lanzaboote updates its pin (or we drop the lanzaboote pin) | 2026-09-25 | on lanzaboote bump | active |
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| WA-004 | `catppuccin` on `main` — `flake.nix` | `main` carries the nodejs→nodejs-slim deprecation fix, which is not in a release | Switch to a release tag once it includes the fix | 2026-09-25 | on catppuccin release | active |
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| WA-005 | `tuios` input — `flake.nix`; `home/base/tui/tuios/` | nixpkgs lags behind upstream | Use nixpkgs' `tuios` once it is recent enough | 2026-10-03 | on nixpkgs bump | active |
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| WA-006 | `nixpkgs-blender` — `flake.nix` | Blender 5.2 LTS + CUDA/OptiX pin; keeps `just up` from triggering a full source rebuild | Bump deliberately when needed; drop the pin if the current nixpkgs build is acceptable | 2026-07-24 | deliberate | active |
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| WA-007 | WeChat from `nixpkgs-master` — `hardening/bwraps/default.nix` | newest builds; the pinned channel lags | Fall back to the stable channel once it has a good build | 2026-10-03 | on nixpkgs bump | active |
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## Workarounds
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A setting that works around a bug or a hardware quirk.
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| ID | What & where | Why | Removal condition | Added | Revisit | Status |
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| ------ | ------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------- | ---------- | ------------------------------------------- | ------ |
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| WA-008 | Relaxed NVMe APST (`nvme_core.default_ps_max_latency_us=100000`) — `hosts/idols-ai/hardware-configuration.nix` | the KINGBANK KP260 (DRAM-less QLC) froze on slow APST wake-ups | Drop the override once kernel/firmware fixes or replacement hardware make default APST reliable | 2026-10-03 | watch NVMe timeout/reset/AER in the journal | active |
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| WA-009 | USB-SATA bridge mitigations (`usbcore.autosuspend=-1`, `usb-storage.delay_use=10`) — `hosts/12kingdoms-youko/default.nix` | flaky JMicron JMS567 resets with UDMA-CRC and I/O errors | Drop once the bridge/controller is replaced; the signal is smartctl CRC/media errors | 2026-09-21 | on hardware change or CRC errors | active |
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| WA-010 | Insta360 Link USB reset on S3 resume — `hosts/idols-ai/default.nix` | the camera stays enumerated with a stalled UVC endpoint after resume | Drop after the Insta360 firmware or the kernel `uvcvideo` fixes it | 2026-08-01 | on kernel or firmware change | active |
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| WA-011 | Kernel module blacklist (`esp4`, `esp6`, `rxrpc`) — `modules/nixos/base/kernel-hardening.nix` | attack surface for the Dirty Frag LPE (CVE-2026-43284 / CVE-2026-43500) | Kept as defence in depth; drop only if something needs those modules | 2026-10-03 | rarely | active |
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If WA-008 freezes recur, the fallback is to restore
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`nvme_core.default_ps_max_latency_us=0 nvme_core.io_timeout=4294967295 pcie_aspm=off`; this is a
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recovery procedure, not its removal condition.
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## Known issues
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A known limitation with no fix yet.
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| ID | What & where | Why | Removal condition | Added | Revisit | Status |
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| ------ | ---------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------- | ----- | -------------------------------------- | ------ |
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| WA-012 | `muvm` (x86_64 apps/games via microVM) disabled — `hosts/12kingdoms-shoukei/apple-silicon.nix` | Apple Silicon's 16k page size means x86_64 apps need `muvm`; it is off because it does not build/run on nixos-apple-silicon yet ([nixos-apple-silicon#237](https://github.com/nix-community/nixos-apple-silicon/issues/237)) | Re-enable once `muvm` builds and works | — | on nixos-apple-silicon or muvm updates | active |
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## WIP
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An unfinished feature or gap.
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| ID | What & where | Why | Removal condition | Added | Revisit | Status |
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| ------ | --------------------------------- | -------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------- | ---------- | --------- | ------ |
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| WA-013 | NixOS tests — `outputs/README.md` | tests rebuild custom packages (no private cache) and hosts need their own ssh host key to decrypt agenix | Resolve when a private cache exists and tests can run per-service | 2024-03-13 | quarterly | active |
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## Related
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- Unmerged **nixpkgs** PRs are carried via the `nixpkgs-patched` input and the
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[`.agents/skills/nixpkgs-patched`](./.agents/skills/nixpkgs-patched/SKILL.md) workflow (that input
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currently carries nothing; package-level carries are recorded under `Pins`).
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- Routine version pins (colmena, agenix, disko, lanzaboote, haumea, home-manager, `nixpkgs-stable`,
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`nixpkgs-darwin`, …) are the versions in use, not workarounds, so they are not listed here.
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@@ -13,6 +13,8 @@ overlays/
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├── default.nix # Entrypoint for all overlays
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├── computer-use-linux.nix # trycua/computer-use-linux package
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├── cua-driver.nix # trycua/cua driver (cua-driver) package
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├── smartctl-exporter/ # smartctl_exporter pinned to the #329 fix
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│ └── default.nix
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└── fcitx5/ # Chinese input method configuration
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├── README.md
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├── default.nix # fcitx5 overlay definition
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@@ -55,3 +57,6 @@ This overlay provides:
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- `computer-use-linux.nix`: packages `pkgs/computer-use-linux`.
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- `cua-driver.nix`: packages `pkgs/cua-driver` (used by the computer-use VMs).
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- `smartctl-exporter/`: pins `prometheus-smartctl-exporter` to the upstream commit carrying PR
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[#329](https://github.com/prometheus-community/smartctl_exporter/pull/329) until nixpkgs provides
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a version containing the fix; see `overlays/smartctl-exporter/default.nix`.
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@@ -0,0 +1,23 @@
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# smartctl_exporter 0.14.0 derives `Describe()` from the devices it can read at
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# startup, so when a device only becomes readable later (an NVMe whose ACL
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# arrives late, or an HDD waking from standby) `Collect()` emits metrics whose
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# descriptors were never registered and `/metrics` returns HTTP 500, failing the
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# whole scrape and hiding even the healthy disks.
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#
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# Pin the package to the upstream commit that carries the fix (PR #329, merged
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# 2026-09-28, then included in the "Update Go (#391)" commit below) instead of
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# backporting it as a patch. Drop this overlay once nixpkgs provides a version
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# containing the #329 fix:
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# https://github.com/prometheus-community/smartctl_exporter/pull/329
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_: _final: prev: {
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prometheus-smartctl-exporter = prev.prometheus-smartctl-exporter.overrideAttrs (_prev: {
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version = "0.14.0-unstable-2026-09-28";
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src = prev.fetchFromGitHub {
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owner = "prometheus-community";
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repo = "smartctl_exporter";
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rev = "6274decc61212cc61e58796cc3b8cf5cfa035809";
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hash = "sha256-KR+j4uLqxVtRpQ7L8UxOypOHZG9CxUGw0ELIO7e6tXc=";
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};
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vendorHash = "sha256-PJiMYWdoQ3Zk7sYHveG9uIgOjllgPuu6RjAPVdKUi6Y=";
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});
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}
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