# SPDX-License-Identifier: Apache-2.0
# SPDX-FileCopyrightText: Copyright contributors to the vLLM-Omni project
"""Lifecycle and concurrency tests for the local filesystem store."""

from __future__ import annotations

import contextlib
import errno
import hashlib
import json
import multiprocessing as mp
import os
import shutil
import stat
import tempfile
import threading
import time
import warnings
from collections.abc import Sequence
from dataclasses import replace
from multiprocessing.process import BaseProcess
from pathlib import Path
from typing import IO, Any

import pytest
import torch

from vllm_omni.host_weight_runtime import (
    AdaptationIdentity,
    ArtifactInventoryState,
    BuildRequest,
    CapacityPolicy,
    ComponentIdentity,
    CoordinationScope,
    FailureCode,
    HostWeightError,
    HostWeightLease,
    IntegrityPolicy,
    ProducerIdentity,
    ProductionMetadata,
    ProductionSourceMode,
    ResolutionStage,
    RuntimeWeightLayout,
    StorageClass,
    StorageDomainPolicy,
    StorageScope,
    StoreResult,
    StoreStatus,
    TensorKind,
    TensorWriteSpec,
    ValidationLevel,
    WeightArtifactIdentity,
    WeightProductionSpec,
    WeightRepresentation,
    WeightSourceIdentity,
)
from vllm_omni.host_weight_runtime.filesystem import (
    FilesystemHostWeightStore,
    detect_filesystem_type,
    detect_storage_class,
)
from vllm_omni.host_weight_runtime.filesystem import store as filesystem_store_module
from vllm_omni.host_weight_runtime.filesystem import writer as filesystem_writer_module
from vllm_omni.host_weight_runtime.filesystem.locks import FileLock
from vllm_omni.host_weight_runtime.filesystem.writer import ArtifactWriterError, FilesystemArtifactWriter

pytestmark = [pytest.mark.core_model, pytest.mark.cpu]

# Spawning imports the complete vLLM package and exceeded 10 seconds on a loaded
# CI worker. Keep process-bootstrap bounds separate from the short store
# deadlines exercised by these tests.
_PROCESS_START_TIMEOUT_SECONDS = 60.0
_PROCESS_COMPLETION_TIMEOUT_SECONDS = 60.0
_PROCESS_CLEANUP_TIMEOUT_SECONDS = 5.0


def _identity(*, tp_rank: int = 0) -> WeightArtifactIdentity:
    return WeightArtifactIdentity(
        schema_version=1,
        source=WeightSourceIdentity("test-org/test-model", "0123456789abcdef", "source-files-sha256"),
        component=ComponentIdentity("transformer", "diffusion.dit"),
        representation=WeightRepresentation("runtime-bf16", "torch.bfloat16"),
        layout=RuntimeWeightLayout(
            "final-module-layout",
            tensor_parallel_size=2,
            tensor_parallel_rank=tp_rank,
        ),
        adaptation=AdaptationIdentity(),
        producer=ProducerIdentity(
            "test.final-layout",
            "1",
            "implementation-sha256",
            "test-producer-v1",
            "test-restorer-v1",
        ),
    )


def _weight(offset: int = 0) -> torch.Tensor:
    return torch.arange(offset, offset + 12, dtype=torch.float32).to(torch.bfloat16).reshape(4, 3)


def _specs() -> tuple[TensorWriteSpec, ...]:
    return (
        TensorWriteSpec("layer.weight", (4, 3), torch.bfloat16),
        TensorWriteSpec("layer.scale", (2,), torch.float32, kind=TensorKind.BUFFER, role="scale"),
    )


def _open_fd_targets() -> tuple[str, ...]:
    targets = []
    for path in Path("/proc/self/fd").iterdir():
        with contextlib.suppress(OSError):
            targets.append(os.readlink(path))
    return tuple(targets)


def _direct_writer(tmp_path: Path) -> FilesystemArtifactWriter:
    staging = tmp_path / "staging"
    staging.mkdir()
    return FilesystemArtifactWriter(staging, capacity_check=lambda _projected, _additional: None)


def test_ordered_writer_hashes_payload_during_writes(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    writer = _direct_writer(tmp_path)
    weight = _weight()
    scale = torch.tensor([1.0, 2.0])

    def fail_rescan(_path: Path, _specs: tuple[TensorWriteSpec, ...]) -> object:
        raise AssertionError("ordered payload must not be rescanned")

    monkeypatch.setattr(filesystem_writer_module, "_scan_payload", fail_rescan)
    with writer.open_tensor_file("weights.safetensors", _specs(), ordered=True) as output:
        # The writer's ordered contract follows canonical storage-key order.
        output.write_tensor("layer.scale", scale)
        output.write_rows("layer.weight", 0, weight[:2])
        output.write_rows("layer.weight", 2, weight[2:])

    manifest, _ = writer.finalize(_identity(), ProductionMetadata("test-producer-v1", "test-restorer-v1"))

    payload = writer.staging_dir / "weights.safetensors"
    assert manifest.files[0].sha256 == hashlib.sha256(payload.read_bytes()).hexdigest()
    expected_tensor_digests = {
        "layer.scale": hashlib.sha256(memoryview(scale.view(torch.uint8).numpy())).hexdigest(),
        "layer.weight": hashlib.sha256(memoryview(weight.contiguous().view(torch.uint8).numpy())).hexdigest(),
    }
    assert {entry.name: entry.sha256 for entry in manifest.tensors} == expected_tensor_digests


def test_ordered_writer_rejects_out_of_order_payload(tmp_path: Path) -> None:
    writer = _direct_writer(tmp_path)
    output = writer.open_tensor_file("weights.safetensors", _specs(), ordered=True)

    with pytest.raises(ArtifactWriterError, match="ordered tensor payload expected offset"):
        output.write_tensor("layer.weight", _weight())

    output.abort()
    assert not list(writer.staging_dir.iterdir())


def test_payload_fsync_overlaps_producer_work(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    writer = _direct_writer(tmp_path)
    started = threading.Event()
    release = threading.Event()
    closed = threading.Event()
    original_fsync = filesystem_writer_module._fsync_payload

    def blocking_fsync(fd: int) -> None:
        started.set()
        if not release.wait(timeout=5):
            raise TimeoutError("test did not release payload fsync")
        original_fsync(fd)

    monkeypatch.setattr(filesystem_writer_module, "_fsync_payload", blocking_fsync)
    output = writer.open_tensor_file("weights.safetensors", _specs(), ordered=True)
    output.write_tensor("layer.scale", torch.tensor([1.0, 2.0]))
    output.write_tensor("layer.weight", _weight())
    close_errors: list[BaseException] = []

    def close_output() -> None:
        try:
            output.close()
        except BaseException as exc:
            close_errors.append(exc)
        finally:
            closed.set()

    close_thread = threading.Thread(target=close_output)
    close_thread.start()
    try:
        assert started.wait(timeout=2)
        assert closed.wait(timeout=1), "payload close waited for fsync instead of overlapping it"
    finally:
        release.set()
        close_thread.join(timeout=5)

    assert not close_errors
    writer.finalize(_identity(), ProductionMetadata("test-producer-v1", "test-restorer-v1"))


def test_payload_fsync_failure_prevents_publication(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    writer = _direct_writer(tmp_path)

    def failing_fsync(fd: int) -> None:
        try:
            raise OSError(errno.EIO, "injected fsync failure")
        finally:
            os.close(fd)

    monkeypatch.setattr(filesystem_writer_module, "_fsync_payload", failing_fsync)
    with writer.open_tensor_file("weights.safetensors", _specs(), ordered=True) as output:
        output.write_tensor("layer.scale", torch.tensor([1.0, 2.0]))
        output.write_tensor("layer.weight", _weight())

    with pytest.raises(OSError, match="injected fsync failure"):
        writer.finalize(_identity(), ProductionMetadata("test-producer-v1", "test-restorer-v1"))

    assert not (writer.staging_dir / "manifest.json").exists()
    assert not (writer.staging_dir / "READY.json").exists()


def test_unordered_payload_fallback_hashes_files_in_parallel(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    writer = _direct_writer(tmp_path)
    specs = (
        TensorWriteSpec("a", (2,), torch.float32),
        TensorWriteSpec("b", (2,), torch.float32),
    )
    for name, spec in zip(("a.safetensors", "b.safetensors"), specs, strict=True):
        with writer.open_tensor_file(name, (spec,)) as output:
            output.write_tensor(spec.name, torch.tensor([1.0, 2.0]))

    original_scan = filesystem_writer_module._scan_payload
    barrier = threading.Barrier(2)
    thread_ids: set[int] = set()
    thread_ids_lock = threading.Lock()

    def synchronized_scan(path: Path, file_specs: tuple[TensorWriteSpec, ...]) -> object:
        with thread_ids_lock:
            thread_ids.add(threading.get_ident())
        barrier.wait(timeout=5)
        return original_scan(path, file_specs)

    monkeypatch.setattr(filesystem_writer_module, "_scan_payload", synchronized_scan)
    manifest, _ = writer.finalize(_identity(), ProductionMetadata("test-producer-v1", "test-restorer-v1"))

    assert len(manifest.files) == 2
    assert len(thread_ids) == 2


class FakeProducer:
    def __init__(
        self,
        identity: WeightArtifactIdentity,
        *,
        counter_path: Path | None = None,
        delay_seconds: float = 0.0,
        started: object | None = None,
        release: object | None = None,
        write_mode: str = "rows",
        weight_offset: int = 0,
        coordination_scope: CoordinationScope = CoordinationScope.SINGLE_PROCESS,
    ) -> None:
        self._spec = WeightProductionSpec(
            producer_id="test.final-layout",
            outputs=(identity,),
            source_mode=ProductionSourceMode.FINALIZED_MODEL,
            coordination_scope=coordination_scope,
        )
        self.counter_path = counter_path
        self.delay_seconds = delay_seconds
        self.started = started
        self.release = release
        self.write_mode = write_mode
        self.weight_offset = weight_offset

    @property
    def spec(self) -> WeightProductionSpec:
        return self._spec

    def produce(self, writer: object) -> ProductionMetadata:
        if self.counter_path is not None:
            fd = os.open(self.counter_path, os.O_CREAT | os.O_APPEND | os.O_WRONLY | os.O_CLOEXEC, 0o600)
            try:
                os.write(fd, f"{os.getpid()}\n".encode())
                os.fsync(fd)
            finally:
                os.close(fd)
        if self.started is not None:
            self.started.set()  # type: ignore[attr-defined]
        if self.release is not None and not self.release.wait(timeout=10):  # type: ignore[attr-defined]
            raise TimeoutError("test producer was not released")
        if self.delay_seconds:
            time.sleep(self.delay_seconds)

        with writer.open_tensor_file("weights.safetensors", _specs()) as output:  # type: ignore[attr-defined]
            if self.write_mode == "rows":
                output.write_rows("layer.weight", 0, _weight(self.weight_offset)[:2])
                output.write_rows("layer.weight", 2, _weight(self.weight_offset)[2:])
            elif self.write_mode == "complete":
                output.write_tensor("layer.weight", _weight(self.weight_offset))
            elif self.write_mode == "incomplete":
                output.write_rows("layer.weight", 0, _weight(self.weight_offset)[:2])
            elif self.write_mode == "overlap":
                output.write_rows("layer.weight", 0, _weight(self.weight_offset)[:3])
                output.write_rows("layer.weight", 2, _weight(self.weight_offset)[2:])
            else:  # pragma: no cover - test helper guard
                raise AssertionError(f"unknown write mode {self.write_mode}")
            output.write_tensor("layer.scale", torch.tensor([1.0, 2.0]))
        return ProductionMetadata("test-producer-v1", "test-restorer-v1")


class CrashProducer(FakeProducer):
    def produce(self, writer: object) -> ProductionMetadata:
        output = writer.open_tensor_file("weights.safetensors", _specs())  # type: ignore[attr-defined]
        output.write_rows("layer.weight", 0, _weight()[:2])
        os._exit(17)


class NonCooperativeStore(FilesystemHostWeightStore):
    """Test double representing a publisher that does not join the build lock."""

    def _build_lock_path(self, key: str) -> Path:
        return self.locks_dir / f"{key}.noncooperative-build.lock"

    def _remove_stale_temps_locked(self, _key: str) -> None:
        return


class InitialLookupBarrierStore(FilesystemHostWeightStore):
    """Make both test workers observe the initial miss before either builds."""

    def __init__(
        self,
        domain: StorageDomainPolicy,
        capacity: CapacityPolicy,
        integrity: IntegrityPolicy,
        *,
        initial_lookup_barrier: object,
    ) -> None:
        super().__init__(domain, capacity, integrity)
        self._initial_lookup_barrier = initial_lookup_barrier
        self._lookup_count = 0

    def lookup(
        self,
        identity: WeightArtifactIdentity,
        *,
        validation: ValidationLevel,
        deadline: float | None = None,
    ) -> StoreResult:
        result = super().lookup(identity, validation=validation, deadline=deadline)
        self._lookup_count += 1
        if self._lookup_count == 1:
            self._initial_lookup_barrier.wait(timeout=10)  # type: ignore[attr-defined]
        return result


class PausingOpenLeaseStore(FilesystemHostWeightStore):
    """Pause after opening a lease so another lookup can publish a deny marker."""

    def __init__(
        self,
        domain: StorageDomainPolicy,
        capacity: CapacityPolicy,
        integrity: IntegrityPolicy,
        *,
        lease_opened: threading.Event,
        resume_lookup: threading.Event,
    ) -> None:
        super().__init__(domain, capacity, integrity)
        self._lease_opened = lease_opened
        self._resume_lookup = resume_lookup

    def _open_lease(
        self,
        identity: WeightArtifactIdentity,
        entry_path: Path,
        artifact_lock: FileLock,
        validation: ValidationLevel,
    ) -> HostWeightLease:
        lease = super()._open_lease(identity, entry_path, artifact_lock, validation)
        self._lease_opened.set()
        if not self._resume_lookup.wait(5):
            lease.close()
            raise TimeoutError("test did not resume paused lookup")
        return lease


def _make_store(
    root: Path,
    *,
    capacity: CapacityPolicy | None = None,
    integrity: IntegrityPolicy | None = None,
) -> FilesystemHostWeightStore:
    root.mkdir(parents=True, exist_ok=True, mode=0o700)
    domain = StorageDomainPolicy(root=root, storage_class=detect_storage_class(root))
    return FilesystemHostWeightStore(domain, capacity or CapacityPolicy(), integrity or IntegrityPolicy())


class _FaultyTemporaryFile:
    """NamedTemporaryFile proxy that injects a write or close failure."""

    def __init__(
        self,
        handle: IO[bytes],
        *,
        write_error: BaseException | None = None,
        close_error: BaseException | None = None,
    ) -> None:
        self._handle = handle
        self._write_error = write_error
        self._close_error = close_error

    def __getattr__(self, name: str) -> object:
        return getattr(self._handle, name)

    def __enter__(self) -> _FaultyTemporaryFile:
        return self

    def __exit__(self, *exc_info: object) -> None:
        self._handle.close()
        if self._close_error is not None:
            raise self._close_error

    def write(self, data: bytes) -> int:
        if self._write_error is not None:
            raise self._write_error
        return self._handle.write(data)


def _inject_temporary_file_failure(
    monkeypatch: pytest.MonkeyPatch,
    *,
    write_error: BaseException | None = None,
    close_error: BaseException | None = None,
) -> None:
    original = tempfile.NamedTemporaryFile

    def faulty(*args: Any, **kwargs: Any) -> _FaultyTemporaryFile:
        handle: IO[bytes] = original(*args, **kwargs)
        return _FaultyTemporaryFile(handle, write_error=write_error, close_error=close_error)

    monkeypatch.setattr(tempfile, "NamedTemporaryFile", faulty)


def test_atomic_json_replace_failure_removes_temporary_file(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    path = tmp_path / "domain.json"
    path.write_bytes(b"existing metadata")
    replace_error = OSError(errno.EIO, "injected replace failure")

    def fail_replace(source: os.PathLike[str], destination: os.PathLike[str]) -> None:
        raise replace_error

    monkeypatch.setattr(os, "replace", fail_replace)

    with pytest.raises(OSError) as error:
        filesystem_store_module._write_atomic_json(path, {"schema_version": 1})

    assert error.value is replace_error
    assert path.read_bytes() == b"existing metadata"
    assert not list(tmp_path.glob(".domain.json.*.tmp"))


def test_atomic_json_cleanup_failure_preserves_replace_error(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    path = tmp_path / "domain.json"
    replace_error = OSError(errno.EIO, "injected replace failure")
    original_unlink = Path.unlink
    cleanup_attempted = False

    def fail_replace(source: os.PathLike[str], destination: os.PathLike[str]) -> None:
        raise replace_error

    def fail_temporary_unlink(target: Path, missing_ok: bool = False) -> None:
        nonlocal cleanup_attempted
        if target.parent == tmp_path and target.name.startswith(".domain.json."):
            cleanup_attempted = True
            raise PermissionError(errno.EACCES, "injected cleanup failure")
        original_unlink(target, missing_ok=missing_ok)

    monkeypatch.setattr(os, "replace", fail_replace)
    monkeypatch.setattr(Path, "unlink", fail_temporary_unlink)

    with pytest.raises(OSError) as error:
        filesystem_store_module._write_atomic_json(path, {"schema_version": 1})

    assert cleanup_attempted
    assert error.value is replace_error
    assert len(list(tmp_path.glob(".domain.json.*.tmp"))) == 1


@pytest.mark.parametrize("close_fails", [False, True])
def test_atomic_json_write_failure_preserves_error_when_cleanup_fails(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
    close_fails: bool,
) -> None:
    path = tmp_path / "domain.json"
    write_error = OSError(errno.EIO, "injected write failure")
    original_unlink = Path.unlink
    cleanup_attempted = False

    def fail_temporary_unlink(target: Path, missing_ok: bool = False) -> None:
        nonlocal cleanup_attempted
        if target.parent == tmp_path and target.name.startswith(".domain.json."):
            cleanup_attempted = True
            raise PermissionError(errno.EACCES, "injected cleanup failure")
        original_unlink(target, missing_ok=missing_ok)

    _inject_temporary_file_failure(
        monkeypatch,
        write_error=write_error,
        close_error=OSError(errno.EIO, "injected close failure") if close_fails else None,
    )
    monkeypatch.setattr(Path, "unlink", fail_temporary_unlink)

    with pytest.raises(OSError) as error:
        filesystem_store_module._write_atomic_json(path, {"schema_version": 1})

    assert cleanup_attempted
    assert error.value is write_error
    assert not path.exists()
    assert len(list(tmp_path.glob(".domain.json.*.tmp"))) == 1


def test_atomic_json_close_failure_removes_temporary_file(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    path = tmp_path / "domain.json"
    close_error = OSError(errno.EIO, "injected close failure")

    _inject_temporary_file_failure(monkeypatch, close_error=close_error)

    with pytest.raises(OSError) as error:
        filesystem_store_module._write_atomic_json(path, {"schema_version": 1})

    assert error.value is close_error
    assert not path.exists()
    assert not list(tmp_path.glob(".domain.json.*.tmp"))


def _publish_test_artifact(
    store: FilesystemHostWeightStore,
    identity: WeightArtifactIdentity | None = None,
) -> tuple[WeightArtifactIdentity, Path]:
    identity = identity or _identity()
    result = store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )
    assert result.status is StoreStatus.BUILT
    assert result.lease is not None
    result.lease.close()
    return identity, store.artifacts_dir / identity.key


def _corrupt_test_payload(artifact: Path) -> None:
    payload = artifact / "weights.safetensors"
    os.chmod(artifact, 0o755)
    os.chmod(payload, 0o644)
    with payload.open("r+b") as handle:
        handle.seek(-1, os.SEEK_END)
        value = handle.read(1)
        handle.seek(-1, os.SEEK_END)
        handle.write(bytes([value[0] ^ 0xFF]))
        handle.flush()
        os.fsync(handle.fileno())
    os.chmod(payload, 0o444)
    os.chmod(artifact, 0o555)


def _build_process(root: str, counter: str, initial_lookup_barrier: object, result_queue: object) -> None:
    try:
        identity = _identity()
        root_path = Path(root)
        root_path.mkdir(parents=True, exist_ok=True, mode=0o700)
        store = InitialLookupBarrierStore(
            StorageDomainPolicy(root=root_path, storage_class=detect_storage_class(root_path)),
            CapacityPolicy(),
            IntegrityPolicy(),
            initial_lookup_barrier=initial_lookup_barrier,
        )
        result = store.get_or_build(
            BuildRequest(identity),
            FakeProducer(identity, counter_path=Path(counter), delay_seconds=0.25),
            validation=ValidationLevel.FULL_CHECKSUM,
            deadline=time.monotonic() + 15,
        )
        fingerprint = result.lease.provenance.backing_fingerprint if result.lease is not None else None
        if result.lease is not None:
            result.lease.close()
        result_queue.put((result.status.value, fingerprint, None))  # type: ignore[attr-defined]
    except BaseException as exc:
        result_queue.put(("error", None, repr(exc)))  # type: ignore[attr-defined]


def _controlled_build_process(root: str, started: object, release: object, result_queue: object) -> None:
    try:
        identity = _identity()
        store = _make_store(Path(root))
        result = store.get_or_build(
            BuildRequest(identity),
            FakeProducer(identity, started=started, release=release),
            validation=ValidationLevel.FULL_CHECKSUM,
            deadline=time.monotonic() + 15,
        )
        if result.lease is not None:
            result.lease.close()
        result_queue.put((result.status.value, None))  # type: ignore[attr-defined]
    except BaseException as exc:
        result_queue.put(("error", repr(exc)))  # type: ignore[attr-defined]


def _pausing_weak_lookup_process(root: str, opened: object, resume: object, result_queue: object) -> None:
    try:
        policy = StorageDomainPolicy(root=Path(root), storage_class=detect_storage_class(Path(root)))
        store = PausingOpenLeaseStore(
            policy,
            CapacityPolicy(),
            IntegrityPolicy(),
            lease_opened=opened,  # type: ignore[arg-type]
            resume_lookup=resume,  # type: ignore[arg-type]
        )
        result = store.lookup(_identity(), validation=ValidationLevel.MANIFEST_AND_METADATA)
        if result.lease is not None:
            result.lease.close()
        code = result.failure.code.value if result.failure is not None else None
        result_queue.put((result.status.value, code, None))  # type: ignore[attr-defined]
    except BaseException as exc:
        result_queue.put(("error", None, repr(exc)))  # type: ignore[attr-defined]


def _crash_build_process(root: str) -> None:
    identity = _identity()
    store = _make_store(Path(root))
    store.get_or_build(
        BuildRequest(identity),
        CrashProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 15,
    )


def _crash_cleanup_process(root: str) -> None:
    identity = _identity()
    store = _make_store(Path(root))

    def crash_before_removal(path: Path) -> None:
        if path.parent == store.quarantine_dir and ".cleanup." in path.name:
            os._exit(23)
        FilesystemHostWeightStore._remove_tree(path)

    store._remove_tree = crash_before_removal  # type: ignore[method-assign]
    store.cleanup(identity)
    raise AssertionError("cleanup did not reach the injected crash point")


def _crash_cleanup_before_rename_process(root: str) -> None:
    identity = _identity()
    store = _make_store(Path(root))
    artifact = store.artifacts_dir / identity.key
    original_replace = os.replace

    def crash_before_rename(
        source: str | os.PathLike[str],
        destination: str | os.PathLike[str],
    ) -> None:
        if Path(source) == artifact and ".cleanup." in Path(destination).name:
            os._exit(31)
        original_replace(source, destination)

    filesystem_store_module.os.replace = crash_before_rename
    store.cleanup(identity)
    raise AssertionError("cleanup did not reach the pre-rename crash point")


def _crash_quarantine_after_rename_process(root: str) -> None:
    identity = _identity()
    store = _make_store(Path(root))
    original_harden = filesystem_store_module._harden_open_directory

    def crash_before_destination_hardening(fd: int, path: Path, mode: int) -> None:
        if path.parent == store.quarantine_dir:
            os._exit(37)
        original_harden(fd, path, mode)

    filesystem_store_module._harden_open_directory = crash_before_destination_hardening
    with FileLock(store._artifact_lock_path(identity.key), exclusive=True, deadline=None):
        store._quarantine_locked(identity.key, reason="validation_failure")
    raise AssertionError("quarantine did not reach the post-rename crash point")


def _crash_after_artifacts_fsync_process(root: str) -> None:
    identity = _identity()
    store = _make_store(Path(root))
    original_fsync_directory = filesystem_store_module._fsync_directory

    def crash_after_artifacts_fsync(path: Path) -> None:
        original_fsync_directory(path)
        if path == store.artifacts_dir:
            os._exit(29)

    filesystem_store_module._fsync_directory = crash_after_artifacts_fsync
    store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 15,
    )
    raise AssertionError("publication did not reach the injected crash point")


def _crash_after_publication_hardening_process(root: str) -> None:
    identity = _identity()
    store = _make_store(Path(root))
    artifact = store.artifacts_dir / identity.key
    original_chmod = os.chmod

    def crash_after_hardening(
        path: str | os.PathLike[str],
        mode: int,
        *args: object,
        **kwargs: object,
    ) -> None:
        original_chmod(path, mode, *args, **kwargs)  # type: ignore[arg-type]
        if Path(path) == artifact and mode == 0o555:
            os._exit(41)

    filesystem_store_module.os.chmod = crash_after_hardening
    store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 15,
    )
    raise AssertionError("publication did not reach the post-hardening crash point")


def _join_processes(
    processes: Sequence[BaseProcess],
    timeout: float = _PROCESS_COMPLETION_TIMEOUT_SECONDS,
) -> None:
    deadline = time.monotonic() + timeout
    for process in processes:
        process.join(max(0.0, deadline - time.monotonic()))
    timed_out = [process for process in processes if process.is_alive()]
    if not timed_out:
        return
    timed_out_workers = ", ".join(f"{process.name}(pid={process.pid})" for process in timed_out)
    for process in timed_out:
        process.terminate()
    for process in timed_out:
        process.join(_PROCESS_CLEANUP_TIMEOUT_SECONDS)
    survivors = [process for process in timed_out if process.is_alive()]
    for process in survivors:
        process.kill()
        process.join(_PROCESS_CLEANUP_TIMEOUT_SECONDS)
    unstoppable = [process for process in survivors if process.is_alive()]
    assert not unstoppable, "timed-out test worker processes could not be stopped"
    pytest.fail(f"test worker processes exceeded the {timeout:g}-second group deadline: {timed_out_workers}")


def test_build_lookup_share_one_published_backing_and_lease_blocks_cleanup(tmp_path: Path) -> None:
    identity = _identity()
    store = _make_store(tmp_path / "store")

    built = store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )
    assert built.status is StoreStatus.BUILT
    assert built.lease is not None
    assert torch.equal(built.lease.tensors["layer.weight"], _weight())
    assert torch.equal(built.lease.tensors["layer.scale"], torch.tensor([1.0, 2.0]))
    assert built.lease.mapped_regions
    assert all(region.address > 0 and region.length > 0 and region.read_only for region in built.lease.mapped_regions)
    with pytest.raises(TypeError, match="process-local"):
        built.lease.__reduce_ex__(4)

    second = store.lookup(identity, validation=ValidationLevel.FULL_CHECKSUM)
    assert second.status is StoreStatus.HIT
    assert second.lease is not None
    assert second.lease.provenance.publication_id == built.lease.provenance.publication_id
    assert second.lease.provenance.backing_fingerprint == built.lease.provenance.backing_fingerprint
    payload = store.artifacts_dir / identity.key / "weights.safetensors"
    assert any(str(payload) in target for target in _open_fd_targets())

    artifact = store.inspect_artifact(identity, validation=ValidationLevel.FULL_CHECKSUM)
    assert artifact.status is StoreStatus.HIT
    assert artifact.manifest is not None and artifact.manifest.identity == identity
    assert artifact.publication_id == built.lease.provenance.publication_id
    assert artifact.artifact_lock_active
    domain = store.inspect_domain()
    assert domain.domain_uuid == built.lease.provenance.domain_uuid
    assert domain.filesystem_type == detect_filesystem_type(store.root)
    assert any(
        item.artifact_key == identity.key and item.state is ArtifactInventoryState.READY and item.size_bytes > 0
        for item in domain.inventory
    )

    active = store.cleanup(identity)
    assert active is not None and active.code is FailureCode.ACTIVE_LEASE
    second.lease.close()
    built.lease.close()
    built.lease.close()
    assert not built.lease.tensors
    assert not any(str(payload) in target for target in _open_fd_targets())

    assert store.cleanup(identity) is None
    assert store.lookup(identity, validation=ValidationLevel.FULL_CHECKSUM).status is StoreStatus.MISS


def test_publication_hardens_artifact_after_atomic_rename(tmp_path: Path) -> None:
    identity = _identity()
    store = _make_store(tmp_path / "store")

    built = store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )

    assert built.status is StoreStatus.BUILT
    assert built.lease is not None
    built.lease.close()
    artifact_dir = store.artifacts_dir / identity.key
    assert artifact_dir.stat().st_mode & 0o777 == 0o555


@pytest.mark.parametrize(
    ("expected_filesystem", "filesystem_root"),
    [("overlay", Path("/tmp")), ("tmpfs", Path("/dev/shm"))],
)
def test_hardened_artifact_cleanup_on_supported_filesystem(
    expected_filesystem: str,
    filesystem_root: Path,
) -> None:
    if not filesystem_root.is_dir():
        pytest.skip(f"{filesystem_root} is unavailable")
    try:
        filesystem_type = detect_filesystem_type(filesystem_root)
    except OSError as exc:
        pytest.skip(f"cannot inspect {filesystem_root} filesystem type: {exc}")
    if filesystem_type != expected_filesystem:
        pytest.skip(f"{filesystem_root} is {filesystem_type!r}, not {expected_filesystem}")
    if not os.access(filesystem_root, os.W_OK | os.X_OK):
        pytest.skip(f"{filesystem_root} is not writable")

    with tempfile.TemporaryDirectory(prefix="vllm-omni-hwr-", dir=filesystem_root) as directory:
        store = _make_store(Path(directory) / "store")
        identity, artifact = _publish_test_artifact(store)
        assert artifact.stat().st_mode & 0o777 == 0o555

        assert store.cleanup(identity) is None
        assert not artifact.exists()
        assert not list(store.quarantine_dir.glob(f"{identity.key}.cleanup.*"))


@pytest.mark.parametrize("failure_point", ["chmod", "rename"])
def test_failed_cleanup_move_preserves_ready_immutability(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
    failure_point: str,
) -> None:
    store = _make_store(tmp_path / "store")
    identity, artifact = _publish_test_artifact(store)
    artifact_inode = artifact.stat().st_ino

    if failure_point == "chmod":
        original_fchmod = os.fchmod

        def fail_make_writable(fd: int, mode: int) -> None:
            if os.fstat(fd).st_ino == artifact_inode and mode & stat.S_IWUSR:
                raise OSError(errno.EIO, "injected artifact chmod failure")
            original_fchmod(fd, mode)

        monkeypatch.setattr(os, "fchmod", fail_make_writable)
    else:
        original_replace = os.replace

        def fail_artifact_rename(
            source: str | os.PathLike[str],
            destination: str | os.PathLike[str],
        ) -> None:
            if Path(source) == artifact:
                raise OSError(errno.EIO, "injected artifact rename failure")
            original_replace(source, destination)

        monkeypatch.setattr(os, "replace", fail_artifact_rename)

    failure = store.cleanup(identity)

    assert failure is not None
    assert failure.code is FailureCode.QUARANTINE_FAILED
    assert failure.retryable
    assert artifact.stat().st_mode & 0o777 == 0o555
    assert not list(store.quarantine_dir.iterdir())
    hit = store.lookup(identity, validation=ValidationLevel.FULL_CHECKSUM)
    assert hit.status is StoreStatus.HIT
    assert hit.lease is not None
    hit.lease.close()


def test_move_artifact_one_shot_restore_failure_still_hardens_destination(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    store = _make_store(tmp_path / "store")
    identity, artifact = _publish_test_artifact(store)
    destination = store.quarantine_dir / f"{identity.key}.direct-test"
    artifact_inode = artifact.stat().st_ino
    original_fchmod = os.fchmod
    injected = False

    def fail_first_hardening(fd: int, mode: int) -> None:
        nonlocal injected
        if os.fstat(fd).st_ino == artifact_inode and destination.exists() and not mode & 0o222 and not injected:
            injected = True
            raise OSError(errno.EIO, "injected artifact hardening failure")
        original_fchmod(fd, mode)

    monkeypatch.setattr(os, "fchmod", fail_first_hardening)
    with FileLock(store._artifact_lock_path(identity.key), exclusive=True, deadline=None):
        filesystem_store_module._move_artifact_locked(artifact, destination)

    assert injected
    assert not artifact.exists()
    assert destination.is_dir()
    assert not destination.stat().st_mode & 0o222


@pytest.mark.parametrize("failing_parent", ["artifacts", "quarantine"])
def test_cleanup_move_fsync_failure_leaves_retryable_immutable_tombstone(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
    failing_parent: str,
) -> None:
    store = _make_store(tmp_path / "store")
    identity, artifact = _publish_test_artifact(store)
    original_fsync_directory = filesystem_store_module._fsync_directory
    failed_path = store.artifacts_dir if failing_parent == "artifacts" else store.quarantine_dir

    def fail_parent_fsync(path: Path) -> None:
        if path == failed_path:
            raise OSError(errno.EIO, "injected cleanup fsync failure")
        original_fsync_directory(path)

    monkeypatch.setattr(filesystem_store_module, "_fsync_directory", fail_parent_fsync)
    failure = store.cleanup(identity)

    assert failure is not None
    assert failure.code is FailureCode.QUARANTINE_FAILED
    assert failure.retryable
    assert not artifact.exists()
    tombstones = list(store.quarantine_dir.glob(f"{identity.key}.cleanup.*"))
    assert len(tombstones) == 1
    assert tombstones[0].stat().st_mode & 0o777 == 0o555
    assert tombstones[0].stat().st_mode & filesystem_store_module._ARTIFACT_INVALIDATION_MODE

    monkeypatch.setattr(filesystem_store_module, "_fsync_directory", original_fsync_directory)
    assert store.cleanup(identity) is None
    assert not list(store.quarantine_dir.glob(f"{identity.key}.cleanup.*"))


def test_cleanup_retries_removal_failure_tombstone(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    store = _make_store(tmp_path / "store")
    identity, artifact = _publish_test_artifact(store)
    original_rmtree = shutil.rmtree

    def fail_cleanup_removal(
        path: str | os.PathLike[str],
    ) -> None:
        if Path(path).parent == store.quarantine_dir and ".cleanup." in Path(path).name:
            raise OSError(errno.EIO, "injected cleanup removal failure")
        original_rmtree(path)

    monkeypatch.setattr(shutil, "rmtree", fail_cleanup_removal)
    failure = store.cleanup(identity)

    assert failure is not None
    assert failure.code is FailureCode.QUARANTINE_FAILED
    assert failure.retryable
    assert not artifact.exists()
    tombstones = list(store.quarantine_dir.glob(f"{identity.key}.cleanup.*"))
    assert len(tombstones) == 1

    monkeypatch.setattr(shutil, "rmtree", original_rmtree)
    assert store.cleanup(identity) is None
    assert not list(store.quarantine_dir.glob(f"{identity.key}.cleanup.*"))


@pytest.mark.parallel
def test_cleanup_after_move_crash_tombstone_is_removed_by_next_build(tmp_path: Path) -> None:
    root = tmp_path / "store"
    store = _make_store(root)
    identity, artifact = _publish_test_artifact(store)
    process = mp.get_context("spawn").Process(target=_crash_cleanup_process, args=(str(root),))

    process.start()
    _join_processes([process])

    assert process.exitcode == 23
    assert not artifact.exists()
    tombstones = list(store.quarantine_dir.glob(f"{identity.key}.cleanup.*"))
    assert len(tombstones) == 1
    assert not tombstones[0].stat().st_mode & 0o222

    rebuilt = store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )
    assert rebuilt.status is StoreStatus.BUILT
    assert rebuilt.lease is not None
    rebuilt.lease.close()
    assert not list(store.quarantine_dir.glob(f"{identity.key}.cleanup.*"))
    assert not (store.deny_dir / f"{identity.key}.json").exists()


@pytest.mark.parallel
def test_pre_rename_cleanup_crash_leaves_persistently_denied_artifact(tmp_path: Path) -> None:
    root = tmp_path / "store"
    store = _make_store(root)
    identity, artifact = _publish_test_artifact(store)
    process = mp.get_context("spawn").Process(
        target=_crash_cleanup_before_rename_process,
        args=(str(root),),
    )

    process.start()
    _join_processes([process])

    assert process.exitcode == 31
    assert artifact.is_dir()
    assert artifact.stat().st_mode & stat.S_IWUSR
    assert artifact.stat().st_mode & filesystem_store_module._ARTIFACT_INVALIDATION_MODE
    weak_store = _make_store(
        root,
        integrity=IntegrityPolicy(require_trusted_permissions=False),
    )
    denied = weak_store.lookup(identity, validation=ValidationLevel.MANIFEST_AND_METADATA)
    assert denied.status is StoreStatus.INVALID
    assert denied.failure is not None and denied.failure.code is FailureCode.ARTIFACT_DENIED

    rebuilt = weak_store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )
    assert rebuilt.status is StoreStatus.BUILT
    assert rebuilt.lease is not None
    rebuilt.lease.close()
    quarantined = list(store.quarantine_dir.glob(f"{identity.key}.validation_failure.*"))
    assert len(quarantined) == 1
    assert not quarantined[0].stat().st_mode & 0o222
    assert not quarantined[0].stat().st_mode & filesystem_store_module._ARTIFACT_INVALIDATION_MODE
    assert not (store.deny_dir / f"{identity.key}.json").exists()
    assert not list(store.tmp_dir.iterdir())


@pytest.mark.parallel
def test_post_rename_quarantine_crash_is_rehardened_by_next_build(tmp_path: Path) -> None:
    root = tmp_path / "store"
    store = _make_store(root)
    identity, artifact = _publish_test_artifact(store)
    process = mp.get_context("spawn").Process(
        target=_crash_quarantine_after_rename_process,
        args=(str(root),),
    )

    process.start()
    _join_processes([process])

    assert process.exitcode == 37
    assert not artifact.exists()
    quarantined = list(store.quarantine_dir.glob(f"{identity.key}.validation_failure.*"))
    assert len(quarantined) == 1
    assert quarantined[0].stat().st_mode & stat.S_IWUSR
    assert quarantined[0].stat().st_mode & filesystem_store_module._ARTIFACT_INVALIDATION_MODE

    rebuilt = store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )
    assert rebuilt.status is StoreStatus.BUILT
    assert rebuilt.lease is not None
    rebuilt.lease.close()
    assert not quarantined[0].stat().st_mode & 0o222
    assert not quarantined[0].stat().st_mode & filesystem_store_module._ARTIFACT_INVALIDATION_MODE
    assert not (store.deny_dir / f"{identity.key}.json").exists()
    assert not list(store.tmp_dir.iterdir())


@pytest.mark.parametrize("failure_point", ["chmod", "artifact_inode_fsync", "artifacts_fsync"])
def test_post_rename_failure_quarantines_non_authoritative_publication(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
    failure_point: str,
) -> None:
    store = _make_store(tmp_path / "store")
    identity = _identity()
    original_fsync_directory = filesystem_store_module._fsync_directory
    injected = False

    if failure_point == "chmod":
        original_chmod = os.chmod

        def fail_publication_chmod(
            path: str | os.PathLike[str],
            mode: int,
            *args: object,
            **kwargs: object,
        ) -> None:
            nonlocal injected
            if Path(path) == store.artifacts_dir / identity.key and mode == 0o555 and not injected:
                injected = True
                raise OSError(errno.EIO, "injected publication chmod failure")
            original_chmod(path, mode, *args, **kwargs)  # type: ignore[arg-type]

        monkeypatch.setattr(os, "chmod", fail_publication_chmod)
    else:
        failed_path = (
            store.artifacts_dir / identity.key if failure_point == "artifact_inode_fsync" else store.artifacts_dir
        )

        def fail_publication_fsync(path: Path) -> None:
            nonlocal injected
            if path == failed_path and not injected:
                injected = True
                raise OSError(errno.EIO, f"injected {failure_point} publication failure")
            original_fsync_directory(path)

        monkeypatch.setattr(filesystem_store_module, "_fsync_directory", fail_publication_fsync)
    result = store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )

    assert injected
    assert result.status is StoreStatus.FAILED
    assert result.failure is not None
    assert result.failure.stage is ResolutionStage.LIFECYCLE
    assert result.failure.code is FailureCode.PUBLICATION_FAILED
    assert not result.failure.retryable
    assert store.lookup(identity, validation=ValidationLevel.FULL_CHECKSUM).status is StoreStatus.MISS
    quarantined = list(store.quarantine_dir.iterdir())
    assert len(quarantined) == 1
    assert ".publication_failure." in quarantined[0].name
    assert quarantined[0].stat().st_mode & 0o777 == 0o555
    assert not list(store.tmp_dir.iterdir())

    monkeypatch.setattr(filesystem_store_module, "_fsync_directory", original_fsync_directory)
    rebuilt = store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )
    assert rebuilt.status is StoreStatus.BUILT
    assert rebuilt.lease is not None
    rebuilt.lease.close()
    assert not (store.deny_dir / f"{identity.key}.json").exists()
    assert not list(store.tmp_dir.iterdir())
    assert not list(store.quarantine_dir.glob(f"{identity.key}.cleanup.*"))


def test_uncontained_publication_failure_is_retryable_and_outcome_uncertain(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    store = _make_store(tmp_path / "store")
    identity = _identity()
    artifact = store.artifacts_dir / identity.key
    original_fsync_directory = filesystem_store_module._fsync_directory
    original_open = os.open
    publication_failed = False

    def fail_artifact_inode_fsync(path: Path) -> None:
        nonlocal publication_failed
        if path == artifact:
            publication_failed = True
            raise OSError(errno.EIO, "injected publication inode fsync failure")
        original_fsync_directory(path)

    def fail_containment_open(
        path: str | bytes | os.PathLike[str] | os.PathLike[bytes],
        flags: int,
        mode: int = 0o777,
        *,
        dir_fd: int | None = None,
    ) -> int:
        if publication_failed and Path(os.fsdecode(path)) == artifact:
            raise OSError(errno.EIO, "injected persistent containment failure")
        return original_open(path, flags, mode, dir_fd=dir_fd)

    with monkeypatch.context() as fault:
        fault.setattr(filesystem_store_module, "_fsync_directory", fail_artifact_inode_fsync)
        fault.setattr(os, "open", fail_containment_open)
        result = store.get_or_build(
            BuildRequest(identity),
            FakeProducer(identity),
            validation=ValidationLevel.FULL_CHECKSUM,
            deadline=time.monotonic() + 10,
        )

    assert publication_failed
    assert result.status is StoreStatus.FAILED
    assert result.failure is not None
    assert result.failure.stage is ResolutionStage.DOMAIN
    assert result.failure.code is FailureCode.DOMAIN_UNAVAILABLE
    assert result.failure.retryable
    details = result.failure.details.to_value()
    assert isinstance(details, dict)
    assert details["outcome_uncertain"] is True
    assert artifact.is_dir()
    assert not artifact.stat().st_mode & filesystem_store_module._ARTIFACT_INVALIDATION_MODE
    assert not list(store.quarantine_dir.iterdir())
    hit = store.lookup(identity, validation=ValidationLevel.FULL_CHECKSUM)
    assert hit.status is StoreStatus.HIT
    assert hit.lease is not None
    hit.lease.close()


@pytest.mark.parallel
def test_crash_after_publication_hardening_leaves_logically_committed_hit(tmp_path: Path) -> None:
    root = tmp_path / "store"
    store = _make_store(root)
    identity = _identity()
    process = mp.get_context("spawn").Process(
        target=_crash_after_publication_hardening_process,
        args=(str(root),),
    )

    process.start()
    _join_processes([process])

    assert process.exitcode == 41
    artifact = store.artifacts_dir / identity.key
    assert artifact.is_dir()
    assert not artifact.stat().st_mode & 0o222
    assert not artifact.stat().st_mode & filesystem_store_module._ARTIFACT_INVALIDATION_MODE
    assert not (store.deny_dir / f"{identity.key}.json").exists()
    assert not list(store.tmp_dir.iterdir())
    hit = store.lookup(identity, validation=ValidationLevel.FULL_CHECKSUM)
    assert hit.status is StoreStatus.HIT
    assert hit.lease is not None
    hit.lease.close()
    assert not list(store.quarantine_dir.iterdir())


@pytest.mark.parallel
def test_crash_after_final_artifacts_fsync_leaves_authoritative_hit(tmp_path: Path) -> None:
    root = tmp_path / "store"
    store = _make_store(root)
    identity = _identity()
    process = mp.get_context("spawn").Process(target=_crash_after_artifacts_fsync_process, args=(str(root),))

    process.start()
    _join_processes([process])

    assert process.exitcode == 29
    artifact = store.artifacts_dir / identity.key
    assert artifact.is_dir()
    assert not artifact.stat().st_mode & 0o222
    assert not artifact.stat().st_mode & filesystem_store_module._ARTIFACT_INVALIDATION_MODE
    assert not (store.deny_dir / f"{identity.key}.json").exists()
    assert not list(store.tmp_dir.iterdir())
    hit = store.lookup(identity, validation=ValidationLevel.FULL_CHECKSUM)
    assert hit.status is StoreStatus.HIT
    assert hit.lease is not None
    hit.lease.close()

    joined = store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )
    assert joined.status is StoreStatus.HIT
    assert joined.lease is not None
    joined.lease.close()
    assert not list(store.quarantine_dir.iterdir())


@pytest.mark.parametrize("lock_kind", ["artifact", "build"])
def test_post_commit_lock_release_error_keeps_authoritative_outcome(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
    lock_kind: str,
) -> None:
    store = _make_store(tmp_path / "store")
    identity = _identity()
    lock_path = (
        store._artifact_lock_path(identity.key) if lock_kind == "artifact" else store._build_lock_path(identity.key)
    )
    original_fsync_directory = filesystem_store_module._fsync_directory
    original_close = FileLock.close
    committed = False
    injected = False

    def observe_publication_commit(path: Path) -> None:
        nonlocal committed
        original_fsync_directory(path)
        if path == store.artifacts_dir:
            committed = True

    def fail_post_commit_close(lock: FileLock) -> None:
        nonlocal injected
        original_close(lock)
        if committed and lock.path == lock_path and not injected:
            injected = True
            raise OSError(errno.EIO, f"injected post-commit {lock_kind} lock release failure")

    monkeypatch.setattr(filesystem_store_module, "_fsync_directory", observe_publication_commit)
    monkeypatch.setattr(FileLock, "close", fail_post_commit_close)
    result = store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )

    assert committed
    assert injected
    assert result.status is StoreStatus.BUILT
    assert result.lease is not None
    result.lease.close()
    hit = store.lookup(identity, validation=ValidationLevel.FULL_CHECKSUM)
    assert hit.status is StoreStatus.HIT
    assert hit.lease is not None
    hit.lease.close()
    assert not list(store.quarantine_dir.iterdir())
    assert not list(store.tmp_dir.iterdir())


def test_joined_build_lock_release_error_keeps_authoritative_outcome(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    store = _make_store(tmp_path / "store")
    identity, _ = _publish_test_artifact(store)
    build_lock_path = store._build_lock_path(identity.key)
    producer_count = tmp_path / "producer-count"
    original_lookup = store.lookup
    original_close = FileLock.close
    lookup_count = 0
    injected = False

    def miss_once(
        lookup_identity: WeightArtifactIdentity,
        *,
        validation: ValidationLevel,
        deadline: float | None = None,
    ) -> StoreResult:
        nonlocal lookup_count
        lookup_count += 1
        if lookup_count == 1:
            return StoreResult(StoreStatus.MISS)
        return original_lookup(lookup_identity, validation=validation, deadline=deadline)

    def fail_joined_build_lock_close(lock: FileLock) -> None:
        nonlocal injected
        original_close(lock)
        if lock.path == build_lock_path and not injected:
            injected = True
            raise OSError(errno.EIO, "injected joined build-lock release failure")

    monkeypatch.setattr(store, "lookup", miss_once)
    monkeypatch.setattr(FileLock, "close", fail_joined_build_lock_close)
    result = store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity, counter_path=producer_count),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )

    assert lookup_count == 2
    assert injected
    assert result.status is StoreStatus.JOINED
    assert result.lease is not None
    result.lease.close()
    assert not producer_count.exists()


def test_concurrent_lease_close_waits_for_resource_teardown(tmp_path: Path) -> None:
    identity = _identity()
    store = _make_store(tmp_path / "store")
    built = store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )
    assert built.lease is not None
    lease = built.lease
    teardown_started = threading.Event()
    allow_teardown = threading.Event()
    second_started = threading.Event()
    second_returned = threading.Event()
    errors: list[BaseException] = []

    def blocking_closer() -> None:
        teardown_started.set()
        if not allow_teardown.wait(5):
            raise TimeoutError("test did not release lease teardown")

    def close_lease(*, started: threading.Event | None = None, returned: threading.Event | None = None) -> None:
        if started is not None:
            started.set()
        try:
            lease.close()
        except BaseException as exc:
            errors.append(exc)
        finally:
            if returned is not None:
                returned.set()

    lease._resource_closers = (*lease._resource_closers, blocking_closer)
    first = threading.Thread(target=close_lease)
    second = threading.Thread(target=close_lease, kwargs={"started": second_started, "returned": second_returned})
    first.start()
    assert teardown_started.wait(5)
    second.start()
    assert second_started.wait(5)
    assert not second_returned.wait(0.2)

    allow_teardown.set()
    first.join(5)
    second.join(5)
    assert not first.is_alive() and not second.is_alive()
    assert second_returned.is_set()
    assert not errors


@pytest.mark.skipif(not hasattr(os, "fork"), reason="fork-specific flock ownership regression")
def test_forked_child_close_does_not_release_parent_lease_lock(tmp_path: Path) -> None:
    identity = _identity()
    store = _make_store(tmp_path / "store")
    built = store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )
    assert built.lease is not None

    with warnings.catch_warnings():
        warnings.simplefilter("ignore", DeprecationWarning)
        child_pid = os.fork()
    if child_pid == 0:  # pragma: no cover - assertions run in the parent
        try:
            built.lease.close()
        except BaseException:
            os._exit(1)
        os._exit(0)
    _, child_status = os.waitpid(child_pid, 0)
    assert os.waitstatus_to_exitcode(child_status) == 0

    active = store.cleanup(identity)
    assert active is not None and active.code is FailureCode.ACTIVE_LEASE
    built.lease.close()
    assert store.cleanup(identity) is None


@pytest.mark.parametrize("write_mode", ["incomplete", "overlap"])
def test_failed_streaming_writes_never_publish_partial_artifacts(tmp_path: Path, write_mode: str) -> None:
    identity = _identity()
    store = _make_store(tmp_path / "store")

    result = store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity, write_mode=write_mode),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )

    assert result.status is StoreStatus.FAILED
    assert result.failure is not None and result.failure.code is FailureCode.PRODUCER_FAILED
    assert not list(store.tmp_dir.iterdir())
    assert not list(store.artifacts_dir.iterdir())


@pytest.mark.parametrize(
    "dtype",
    [
        dtype
        for name in ("float8_e4m3fn", "float8_e5m2", "float8_e4m3fnuz", "float8_e5m2fnuz")
        if (dtype := getattr(torch, name, None)) is not None
    ],
)
def test_available_float8_formats_round_trip_through_streaming_store(tmp_path: Path, dtype: torch.dtype) -> None:
    identity = replace(
        _identity(),
        representation=WeightRepresentation(name="runtime-fp8", dtype=str(dtype)),
    )
    expected = torch.zeros((2, 4), dtype=dtype)

    class Float8Producer:
        spec = WeightProductionSpec(
            producer_id="test.final-layout",
            outputs=(identity,),
            source_mode=ProductionSourceMode.FINALIZED_MODEL,
        )

        def produce(self, writer: object) -> ProductionMetadata:
            spec = TensorWriteSpec("weight", tuple(expected.shape), dtype)
            with writer.open_tensor_file("weights.safetensors", (spec,)) as output:  # type: ignore[attr-defined]
                output.write_tensor("weight", expected)
            return ProductionMetadata("test-producer-v1", "test-restorer-v1")

    store = _make_store(tmp_path / "store")
    result = store.get_or_build(
        BuildRequest(identity),
        Float8Producer(),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )

    assert result.status is StoreStatus.BUILT
    assert result.lease is not None
    actual = result.lease.tensors["weight"]
    assert actual.dtype is dtype
    assert torch.equal(actual.view(torch.uint8), expected.view(torch.uint8))
    result.lease.close()


def test_lookup_treats_orphan_deny_marker_as_miss(tmp_path: Path) -> None:
    identity = _identity()
    store = _make_store(tmp_path / "store")
    deny = store.deny_dir / f"{identity.key}.json"
    deny.write_text("{}", encoding="utf-8")

    result = store.lookup(identity, validation=ValidationLevel.FULL_CHECKSUM)

    assert result.status is StoreStatus.MISS


def test_overlapping_weaker_lookup_cannot_return_after_artifact_is_denied(tmp_path: Path) -> None:
    identity = _identity()
    root = tmp_path / "store"
    store = _make_store(root)
    built = store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )
    assert built.lease is not None
    built.lease.close()

    artifact_dir = store.artifacts_dir / identity.key
    payload = artifact_dir / "weights.safetensors"
    os.chmod(artifact_dir, 0o755)
    os.chmod(payload, 0o644)
    with payload.open("r+b") as handle:
        handle.seek(-1, os.SEEK_END)
        original = handle.read(1)
        handle.seek(-1, os.SEEK_END)
        handle.write(bytes([original[0] ^ 0xFF]))
        handle.flush()
        os.fsync(handle.fileno())
    os.chmod(payload, 0o444)
    os.chmod(artifact_dir, 0o555)

    lease_opened = threading.Event()
    resume_lookup = threading.Event()
    overlapping = PausingOpenLeaseStore(
        StorageDomainPolicy(root=root, storage_class=detect_storage_class(root)),
        CapacityPolicy(),
        IntegrityPolicy(),
        lease_opened=lease_opened,
        resume_lookup=resume_lookup,
    )
    weak_results: list[StoreResult] = []

    def weak_lookup() -> None:
        weak_results.append(overlapping.lookup(identity, validation=ValidationLevel.MANIFEST_AND_METADATA))

    thread = threading.Thread(target=weak_lookup)
    thread.start()
    try:
        assert lease_opened.wait(5)
        strong = store.lookup(identity, validation=ValidationLevel.FULL_CHECKSUM)
        assert strong.status is StoreStatus.INVALID
        assert (store.deny_dir / f"{identity.key}.json").is_file()
    finally:
        resume_lookup.set()
        thread.join(5)

    assert not thread.is_alive()
    assert len(weak_results) == 1
    weak = weak_results[0]
    assert weak.status is StoreStatus.INVALID
    assert weak.failure is not None and weak.failure.code is FailureCode.ARTIFACT_DENIED


@pytest.mark.parametrize(
    ("failure_errno", "expected_stage", "expected_code"),
    [
        (errno.ENOSPC, ResolutionStage.CAPACITY, FailureCode.ENOSPC),
        (errno.EDQUOT, ResolutionStage.CAPACITY, FailureCode.ENOSPC),
        (errno.EIO, ResolutionStage.DOMAIN, FailureCode.DOMAIN_UNAVAILABLE),
    ],
)
@pytest.mark.skipif(
    not Path("/proc/self/fd").is_dir(),
    reason="fault targeting requires Linux /proc/self/fd",
)
def test_deny_write_failure_surfaces_as_retryable_storage_failure(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
    failure_errno: int,
    expected_stage: ResolutionStage,
    expected_code: FailureCode,
) -> None:
    store = _make_store(tmp_path / "store")
    identity, artifact = _publish_test_artifact(store)
    _corrupt_test_payload(artifact)
    deny_path = store.deny_dir / f"{identity.key}.json"
    original_write = os.write

    def fail_deny_write(fd: int, data: bytes) -> int:
        if Path(os.readlink(f"/proc/self/fd/{fd}")) == deny_path:
            raise OSError(failure_errno, "injected deny write failure")
        return original_write(fd, data)

    with monkeypatch.context() as fault:
        fault.setattr(os, "write", fail_deny_write)
        failed = store.lookup(identity, validation=ValidationLevel.FULL_CHECKSUM)

    assert failed.status is StoreStatus.FAILED
    assert failed.failure is not None
    assert failed.failure.stage is expected_stage
    assert failed.failure.code is expected_code
    assert failed.failure.retryable
    assert deny_path.exists()
    assert not artifact.exists()
    assert len(list(store.quarantine_dir.glob(f"{identity.key}.validation_failure.*"))) == 1

    rebuilt = store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )
    assert rebuilt.status is StoreStatus.BUILT
    assert rebuilt.lease is not None
    rebuilt.lease.close()
    assert not deny_path.exists()


def test_deny_open_failure_is_not_reported_as_successful_invalidation(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    store = _make_store(tmp_path / "store")
    identity, artifact = _publish_test_artifact(store)
    _corrupt_test_payload(artifact)
    deny_path = store.deny_dir / f"{identity.key}.json"
    original_open = os.open

    def fail_deny_open(
        path: str | bytes | os.PathLike[str] | os.PathLike[bytes],
        flags: int,
        mode: int = 0o777,
        *,
        dir_fd: int | None = None,
    ) -> int:
        if Path(os.fsdecode(path)) == deny_path and flags & os.O_CREAT:
            raise OSError(errno.EIO, "injected deny open failure")
        return original_open(path, flags, mode, dir_fd=dir_fd)

    with monkeypatch.context() as fault:
        fault.setattr(os, "open", fail_deny_open)
        failed = store.lookup(identity, validation=ValidationLevel.FULL_CHECKSUM)

    assert failed.status is StoreStatus.FAILED
    assert failed.failure is not None
    assert failed.failure.stage is ResolutionStage.DOMAIN
    assert failed.failure.code is FailureCode.DOMAIN_UNAVAILABLE
    assert failed.failure.retryable
    assert not deny_path.exists()
    assert not artifact.exists()
    quarantined = list(store.quarantine_dir.glob(f"{identity.key}.validation_failure.*"))
    assert len(quarantined) == 1
    assert not quarantined[0].stat().st_mode & 0o222

    assert store.lookup(identity, validation=ValidationLevel.MANIFEST_AND_METADATA).status is StoreStatus.MISS
    rebuilt = store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )
    assert rebuilt.status is StoreStatus.BUILT
    assert rebuilt.lease is not None
    rebuilt.lease.close()
    assert not deny_path.exists()


def test_deny_method_eio_synchronously_excludes_artifact_from_weaker_lookup(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    store = _make_store(tmp_path / "store")
    identity, artifact = _publish_test_artifact(store)
    _corrupt_test_payload(artifact)

    def fail_deny(_key: str, _failure: object) -> None:
        raise OSError(errno.EIO, "injected deny publication failure")

    with monkeypatch.context() as fault:
        fault.setattr(store, "_write_deny", fail_deny)
        failed = store.lookup(identity, validation=ValidationLevel.FULL_CHECKSUM)

    assert failed.status is StoreStatus.FAILED
    assert failed.failure is not None
    assert failed.failure.stage is ResolutionStage.DOMAIN
    assert failed.failure.code is FailureCode.DOMAIN_UNAVAILABLE
    assert failed.failure.retryable
    assert "injected deny publication failure" in failed.failure.message
    assert not artifact.exists()
    assert not (store.deny_dir / f"{identity.key}.json").exists()
    assert store.lookup(identity, validation=ValidationLevel.MANIFEST_AND_METADATA).status is StoreStatus.MISS
    quarantined = list(store.quarantine_dir.glob(f"{identity.key}.validation_failure.*"))
    assert len(quarantined) == 1
    assert not quarantined[0].stat().st_mode & 0o222


def test_deny_failure_containment_preserves_a_replacement_publication(tmp_path: Path) -> None:
    store = _make_store(tmp_path / "store")
    identity, artifact = _publish_test_artifact(store)
    old_inode = (artifact.stat().st_dev, artifact.stat().st_ino)
    _corrupt_test_payload(artifact)
    shared_lock = FileLock(
        store._artifact_lock_path(identity.key),
        exclusive=False,
        deadline=time.monotonic() + 10,
    )
    rebuilt_publications: list[tuple[str, tuple[int, int]]] = []

    class RebuildOnSharedLockRelease:
        def close(self) -> None:
            shared_lock.close()
            rebuilt = store.get_or_build(
                BuildRequest(identity),
                FakeProducer(identity),
                validation=ValidationLevel.FULL_CHECKSUM,
                deadline=time.monotonic() + 10,
            )
            assert rebuilt.status is StoreStatus.BUILT
            assert rebuilt.lease is not None
            rebuilt_inode = (artifact.stat().st_dev, artifact.stat().st_ino)
            rebuilt_publications.append((rebuilt.lease.provenance.publication_id, rebuilt_inode))
            rebuilt.lease.close()

    containment = store._contain_invalid_after_deny_failure(
        identity.key,
        RebuildOnSharedLockRelease(),  # type: ignore[arg-type]
        deadline=time.monotonic() + 10,
    )

    assert containment["invalidation_marker"] == "durable"
    assert containment["quarantine"] == "already_replaced"
    assert len(rebuilt_publications) == 1
    publication_id, rebuilt_inode = rebuilt_publications[0]
    assert rebuilt_inode != old_inode
    assert (artifact.stat().st_dev, artifact.stat().st_ino) == rebuilt_inode
    hit = store.lookup(identity, validation=ValidationLevel.FULL_CHECKSUM)
    assert hit.status is StoreStatus.HIT
    assert hit.lease is not None
    assert hit.lease.provenance.publication_id == publication_id
    hit.lease.close()
    assert len(list(store.quarantine_dir.glob(f"{identity.key}.validation_failure.*"))) == 1
    assert not (store.deny_dir / f"{identity.key}.json").exists()
    assert not list(store.tmp_dir.iterdir())
    assert not list(store.quarantine_dir.glob(f"{identity.key}.cleanup.*"))


@pytest.mark.parallel
def test_deny_failure_blocks_overlapping_weaker_lookup_across_processes(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    ctx = mp.get_context("spawn")
    root = tmp_path / "store"
    store = _make_store(root)
    identity, artifact = _publish_test_artifact(store)
    _corrupt_test_payload(artifact)
    lease_opened = ctx.Event()
    resume_lookup = ctx.Event()
    result_queue = ctx.Queue()
    process = ctx.Process(
        target=_pausing_weak_lookup_process,
        args=(str(root), lease_opened, resume_lookup, result_queue),
    )
    strong_results: list[StoreResult] = []

    def fail_deny(_key: str, _failure: object) -> None:
        raise OSError(errno.EIO, "injected deny publication failure")

    def strong_lookup() -> None:
        strong_results.append(
            store.lookup(
                identity,
                validation=ValidationLevel.FULL_CHECKSUM,
                deadline=time.monotonic() + 10,
            )
        )

    process.start()
    strong_thread = threading.Thread(target=strong_lookup)
    strong_started = False
    try:
        assert lease_opened.wait(timeout=_PROCESS_START_TIMEOUT_SECONDS)
        monkeypatch.setattr(store, "_write_deny", fail_deny)
        strong_thread.start()
        strong_started = True
        marker_deadline = time.monotonic() + 5
        while not artifact.stat().st_mode & filesystem_store_module._ARTIFACT_INVALIDATION_MODE:
            assert time.monotonic() < marker_deadline, "invalidation marker was not published"
            time.sleep(0.01)
    finally:
        resume_lookup.set()
        if strong_started:
            strong_thread.join(timeout=10)
        _join_processes([process])

    assert not strong_thread.is_alive()
    assert process.exitcode == 0
    assert result_queue.get(timeout=3) == (
        StoreStatus.INVALID.value,
        FailureCode.ARTIFACT_DENIED.value,
        None,
    )
    assert len(strong_results) == 1
    strong = strong_results[0]
    assert strong.status is StoreStatus.FAILED
    assert strong.failure is not None and strong.failure.code is FailureCode.DOMAIN_UNAVAILABLE
    assert not artifact.exists()
    assert len(list(store.quarantine_dir.glob(f"{identity.key}.validation_failure.*"))) == 1


@pytest.mark.parametrize("failure_point", ["entry_open", "ready_read", "payload_hash"])
def test_operational_lookup_eio_is_retryable_without_denying_valid_artifact(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
    failure_point: str,
) -> None:
    store = _make_store(tmp_path / "store")
    identity, artifact = _publish_test_artifact(store)

    with monkeypatch.context() as fault:
        if failure_point == "entry_open":
            original_open = os.open

            def fail_entry_open(
                path: str | bytes | os.PathLike[str] | os.PathLike[bytes],
                flags: int,
                mode: int = 0o777,
                *,
                dir_fd: int | None = None,
            ) -> int:
                if Path(os.fsdecode(path)) == artifact:
                    raise OSError(errno.EIO, "injected artifact open failure")
                return original_open(path, flags, mode, dir_fd=dir_fd)

            fault.setattr(os, "open", fail_entry_open)
        elif failure_point == "ready_read":
            original_read_json_at = filesystem_store_module._read_json_at

            def fail_ready_read(
                directory_fd: int,
                name: str,
                *,
                require_read_only: bool = False,
            ) -> dict[str, object]:
                if name == "READY.json":
                    raise OSError(errno.EIO, "injected READY metadata read failure")
                return original_read_json_at(
                    directory_fd,
                    name,
                    require_read_only=require_read_only,
                )

            fault.setattr(filesystem_store_module, "_read_json_at", fail_ready_read)
        else:

            def fail_hash(_fd: int, _size: int) -> str:
                raise OSError(errno.EIO, "injected hash failure")

            fault.setattr(filesystem_store_module, "_sha256_fd", fail_hash)
        failed = store.lookup(identity, validation=ValidationLevel.FULL_CHECKSUM)

    assert failed.status is StoreStatus.FAILED
    assert failed.failure is not None
    assert failed.failure.stage is ResolutionStage.DOMAIN
    assert failed.failure.code is FailureCode.DOMAIN_UNAVAILABLE
    assert failed.failure.retryable
    assert not (store.deny_dir / f"{identity.key}.json").exists()

    hit = store.lookup(identity, validation=ValidationLevel.FULL_CHECKSUM)
    assert hit.status is StoreStatus.HIT
    assert hit.lease is not None
    hit.lease.close()


@pytest.mark.parametrize("failure_point", ["entry_stat", "deny_stat"])
@pytest.mark.skipif(
    not Path("/proc/self/fd").is_dir(),
    reason="lock descriptor assertions require Linux /proc/self/fd",
)
def test_lookup_state_probe_eio_is_typed_and_releases_artifact_lock(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
    failure_point: str,
) -> None:
    store = _make_store(tmp_path / "store")
    identity, artifact = _publish_test_artifact(store)
    deny_path = store.deny_dir / f"{identity.key}.json"
    target = artifact if failure_point == "entry_stat" else deny_path
    artifact_lock_target = str(store._artifact_lock_path(identity.key))
    lock_fds_before = _open_fd_targets().count(artifact_lock_target)
    original_lstat = Path.lstat
    injected = False

    def fail_state_probe(path: Path) -> os.stat_result:
        nonlocal injected
        if path == target and not injected:
            injected = True
            raise OSError(errno.EIO, f"injected {failure_point} failure")
        return original_lstat(path)

    with monkeypatch.context() as fault:
        fault.setattr(Path, "lstat", fail_state_probe)
        failed = store.lookup(identity, validation=ValidationLevel.FULL_CHECKSUM)

    assert injected
    assert failed.status is StoreStatus.FAILED
    assert failed.failure is not None
    assert failed.failure.stage is ResolutionStage.DOMAIN
    assert failed.failure.code is FailureCode.DOMAIN_UNAVAILABLE
    assert failed.failure.retryable
    assert _open_fd_targets().count(artifact_lock_target) == lock_fds_before
    assert not deny_path.exists()
    hit = store.lookup(identity, validation=ValidationLevel.FULL_CHECKSUM)
    assert hit.status is StoreStatus.HIT
    assert hit.lease is not None
    hit.lease.close()


def test_full_checksum_denies_quarantines_and_rebuilds_corrupt_payload(tmp_path: Path) -> None:
    identity = _identity()
    store = _make_store(tmp_path / "store")
    rebuild_count = tmp_path / "rebuild-count"
    built = store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )
    assert built.lease is not None
    built.lease.close()

    artifact_dir = store.artifacts_dir / identity.key
    _corrupt_test_payload(artifact_dir)

    metadata_only = store.lookup(identity, validation=ValidationLevel.MANIFEST_AND_METADATA)
    assert metadata_only.status is StoreStatus.HIT
    assert metadata_only.lease is not None
    metadata_only.lease.close()

    inspected = store.inspect_artifact(identity, validation=ValidationLevel.FULL_CHECKSUM)
    assert inspected.status is StoreStatus.INVALID
    assert inspected.failure is not None and inspected.failure.code is FailureCode.CHECKSUM_MISMATCH
    assert not (store.deny_dir / f"{identity.key}.json").exists()

    invalid = store.lookup(identity, validation=ValidationLevel.FULL_CHECKSUM)
    assert invalid.status is StoreStatus.INVALID
    assert invalid.failure is not None and invalid.failure.code is FailureCode.CHECKSUM_MISMATCH
    assert (store.deny_dir / f"{identity.key}.json").is_file()

    rebuilt = store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity, counter_path=rebuild_count),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )
    assert rebuilt.status is StoreStatus.BUILT
    assert rebuilt.lease is not None
    assert torch.equal(rebuilt.lease.tensors["layer.weight"], _weight())
    rebuilt.lease.close()
    assert rebuild_count.read_text(encoding="utf-8").count("\n") == 1
    assert not (store.deny_dir / f"{identity.key}.json").exists()
    quarantined = list(store.quarantine_dir.glob(f"{identity.key}.validation_failure.*"))
    assert len(quarantined) == 1
    assert not quarantined[0].stat().st_mode & 0o222
    assert not list(store.tmp_dir.iterdir())
    assert not list(store.quarantine_dir.glob(f"{identity.key}.cleanup.*"))


def test_pre_writable_crash_state_is_quarantined_immutably_and_rebuilt(tmp_path: Path) -> None:
    store = _make_store(tmp_path / "store")
    identity, artifact = _publish_test_artifact(store)
    rebuild_count = tmp_path / "rebuild-count"
    os.chmod(artifact, 0o755)

    invalid = store.lookup(identity, validation=ValidationLevel.FULL_CHECKSUM)

    assert invalid.status is StoreStatus.INVALID
    assert invalid.failure is not None and invalid.failure.code is FailureCode.MANIFEST_CORRUPT
    assert (store.deny_dir / f"{identity.key}.json").is_file()

    rebuilt = store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity, counter_path=rebuild_count),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )

    assert rebuilt.status is StoreStatus.BUILT
    assert rebuilt.lease is not None
    rebuilt.lease.close()
    assert rebuild_count.read_text(encoding="utf-8").count("\n") == 1
    assert not (store.artifacts_dir / identity.key).stat().st_mode & 0o222
    quarantined = list(store.quarantine_dir.glob(f"{identity.key}.validation_failure.*"))
    assert len(quarantined) == 1
    assert not quarantined[0].stat().st_mode & 0o222
    assert not (store.deny_dir / f"{identity.key}.json").exists()
    assert not list(store.tmp_dir.iterdir())
    assert not list(store.quarantine_dir.glob(f"{identity.key}.cleanup.*"))


def test_malformed_safetensors_is_a_typed_invalid_artifact(tmp_path: Path) -> None:
    identity = _identity()
    store = _make_store(tmp_path / "store")
    built = store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )
    assert built.lease is not None
    built.lease.close()

    artifact_dir = store.artifacts_dir / identity.key
    payload = artifact_dir / "weights.safetensors"
    os.chmod(artifact_dir, 0o755)
    os.chmod(payload, 0o644)
    with payload.open("r+b") as handle:
        handle.write(b"\xff" * 8)
        handle.flush()
        os.fsync(handle.fileno())
    os.chmod(payload, 0o444)
    os.chmod(artifact_dir, 0o555)

    result = store.lookup(identity, validation=ValidationLevel.MANIFEST_AND_METADATA)

    assert result.status is StoreStatus.INVALID
    assert result.failure is not None and result.failure.code is FailureCode.MANIFEST_CORRUPT
    assert (store.deny_dir / f"{identity.key}.json").is_file()


@pytest.mark.parametrize("schema_field", ["producer_schema", "restorer_schema"])
def test_lookup_rejects_manifest_schema_that_differs_from_identity(
    tmp_path: Path,
    schema_field: str,
) -> None:
    identity = _identity()
    store = _make_store(tmp_path / "store")
    built = store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )
    assert built.lease is not None
    built.lease.close()

    artifact_dir = store.artifacts_dir / identity.key
    manifest_path = artifact_dir / "manifest.json"
    marker_path = artifact_dir / "READY.json"
    manifest_document = json.loads(manifest_path.read_bytes())
    marker_document = json.loads(marker_path.read_bytes())
    manifest_document[schema_field] = "incompatible-schema"
    manifest_bytes = json.dumps(
        manifest_document,
        ensure_ascii=False,
        sort_keys=True,
        separators=(",", ":"),
    ).encode("utf-8")
    marker_document["manifest_sha256"] = hashlib.sha256(manifest_bytes).hexdigest()
    marker_bytes = json.dumps(
        marker_document,
        ensure_ascii=False,
        sort_keys=True,
        separators=(",", ":"),
    ).encode("utf-8")

    os.chmod(artifact_dir, 0o755)
    for path, contents in ((manifest_path, manifest_bytes), (marker_path, marker_bytes)):
        os.chmod(path, 0o644)
        path.write_bytes(contents)
        os.chmod(path, 0o444)
    os.chmod(artifact_dir, 0o555)

    result = store.lookup(identity, validation=ValidationLevel.MANIFEST_AND_METADATA)

    assert result.status is StoreStatus.INVALID
    assert result.failure is not None and result.failure.code is FailureCode.MANIFEST_INCOMPATIBLE
    assert (store.deny_dir / f"{identity.key}.json").is_file()


def test_noncooperative_conflicting_publication_is_reported_without_replacement(tmp_path: Path) -> None:
    identity = _identity()
    root = tmp_path / "store"
    store = _make_store(root)
    started = threading.Event()
    release = threading.Event()
    thread_result: list[StoreResult] = []

    def build_expected_content() -> None:
        thread_result.append(
            store.get_or_build(
                BuildRequest(identity),
                FakeProducer(identity, started=started, release=release),
                validation=ValidationLevel.FULL_CHECKSUM,
                deadline=time.monotonic() + 10,
            )
        )

    builder = threading.Thread(target=build_expected_content)
    builder.start()
    try:
        assert started.wait(timeout=5)
        competing = NonCooperativeStore(store.domain_policy, store.capacity_policy, store.integrity_policy)
        published = competing.get_or_build(
            BuildRequest(identity),
            FakeProducer(identity, weight_offset=100),
            validation=ValidationLevel.FULL_CHECKSUM,
            deadline=time.monotonic() + 10,
        )
        assert published.status is StoreStatus.BUILT
        assert published.lease is not None
        published.lease.close()
    finally:
        release.set()
        builder.join(timeout=10)
    assert not builder.is_alive()
    assert len(thread_result) == 1
    collision = thread_result[0]
    assert collision.status is StoreStatus.FAILED
    assert collision.failure is not None and collision.failure.code is FailureCode.IDENTITY_COLLISION

    winner = store.lookup(identity, validation=ValidationLevel.FULL_CHECKSUM)
    assert winner.status is StoreStatus.HIT
    assert winner.lease is not None
    assert torch.equal(winner.lease.tensors["layer.weight"], _weight(100))
    winner.lease.close()
    assert len(list(store.quarantine_dir.iterdir())) == 1


def test_same_semantic_competing_publication_remains_authoritative_on_staging_cleanup_eio(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    identity = _identity()
    root = tmp_path / "store"
    store = _make_store(root)
    injected = False
    original_remove_tree = FilesystemHostWeightStore._remove_tree

    class CompetingProducer(FakeProducer):
        def produce(self, writer: object) -> ProductionMetadata:
            competing = NonCooperativeStore(store.domain_policy, store.capacity_policy, store.integrity_policy)
            published = competing.get_or_build(
                BuildRequest(identity),
                FakeProducer(identity),
                validation=ValidationLevel.FULL_CHECKSUM,
                deadline=time.monotonic() + 10,
            )
            assert published.status is StoreStatus.BUILT
            assert published.lease is not None
            published.lease.close()
            return super().produce(writer)

    def fail_primary_staging_cleanup_once(path: Path) -> None:
        nonlocal injected
        if path.parent == store.tmp_dir and not injected:
            injected = True
            raise OSError(errno.EIO, "injected same-semantic staging cleanup failure")
        original_remove_tree(path)

    monkeypatch.setattr(store, "_remove_tree", fail_primary_staging_cleanup_once)
    result = store.get_or_build(
        BuildRequest(identity),
        CompetingProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )

    assert injected
    assert result.status is StoreStatus.BUILT
    assert result.lease is not None
    result.lease.close()
    assert not list(store.tmp_dir.iterdir())
    assert not list(store.deny_dir.iterdir())
    assert not list(store.quarantine_dir.iterdir())
    hit = store.lookup(identity, validation=ValidationLevel.FULL_CHECKSUM)
    assert hit.status is StoreStatus.HIT
    assert hit.lease is not None
    hit.lease.close()


def test_competing_publication_manifest_eio_is_retryable_and_preserves_entry(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    identity = _identity()
    root = tmp_path / "store"
    store = _make_store(root)
    artifact = store.artifacts_dir / identity.key
    manifest_path = artifact / "manifest.json"
    original_read_json_file = filesystem_store_module._read_json_file
    injected = False

    class CompetingProducer(FakeProducer):
        def produce(self, writer: object) -> ProductionMetadata:
            competing = NonCooperativeStore(store.domain_policy, store.capacity_policy, store.integrity_policy)
            published = competing.get_or_build(
                BuildRequest(identity),
                FakeProducer(identity),
                validation=ValidationLevel.FULL_CHECKSUM,
                deadline=time.monotonic() + 10,
            )
            assert published.status is StoreStatus.BUILT
            assert published.lease is not None
            published.lease.close()
            return super().produce(writer)

    def fail_competing_manifest_read_once(path: Path) -> dict[str, object]:
        nonlocal injected
        if path == manifest_path and not injected:
            injected = True
            raise OSError(errno.EIO, "injected competing manifest read failure")
        return original_read_json_file(path)

    monkeypatch.setattr(filesystem_store_module, "_read_json_file", fail_competing_manifest_read_once)
    result = store.get_or_build(
        BuildRequest(identity),
        CompetingProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )

    assert injected
    assert result.status is StoreStatus.FAILED
    assert result.failure is not None
    assert result.failure.stage is ResolutionStage.DOMAIN
    assert result.failure.code is FailureCode.DOMAIN_UNAVAILABLE
    assert result.failure.retryable
    details = result.failure.details.to_value()
    assert isinstance(details, dict)
    assert details["outcome_uncertain"] is True
    assert details["competing_entry"] == "preserved"
    assert artifact.is_dir()
    assert not list(store.quarantine_dir.iterdir())
    assert not list(store.tmp_dir.iterdir())
    hit = store.lookup(identity, validation=ValidationLevel.FULL_CHECKSUM)
    assert hit.status is StoreStatus.HIT
    assert hit.lease is not None
    hit.lease.close()


def test_payload_symlink_is_rejected_without_following_it(tmp_path: Path) -> None:
    identity = _identity()
    store = _make_store(tmp_path / "store")
    built = store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )
    assert built.lease is not None
    built.lease.close()

    artifact_dir = store.artifacts_dir / identity.key
    payload = artifact_dir / "weights.safetensors"
    outside = tmp_path / "outside.safetensors"
    os.chmod(artifact_dir, 0o755)
    payload.rename(outside)
    payload.symlink_to(outside)
    os.chmod(artifact_dir, 0o555)

    result = store.lookup(identity, validation=ValidationLevel.MANIFEST_AND_METADATA)
    assert result.status is StoreStatus.INVALID
    assert result.failure is not None and result.failure.code is FailureCode.MANIFEST_CORRUPT


def test_coordination_deadline_does_not_claim_to_cancel_an_active_producer(tmp_path: Path) -> None:
    identity = _identity()
    store = _make_store(tmp_path / "store")
    started = time.monotonic()

    result = store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity, delay_seconds=0.15),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 0.02,
    )

    assert time.monotonic() - started >= 0.1
    assert result.status is StoreStatus.BUILT
    assert result.lease is not None
    result.lease.close()


@pytest.mark.parallel
def test_multiprocess_contention_runs_one_builder_and_joins_same_artifact(tmp_path: Path) -> None:
    ctx = mp.get_context("spawn")
    root = tmp_path / "store"
    _make_store(root)
    counter = tmp_path / "producer-count"
    initial_lookup_barrier = ctx.Barrier(2)
    result_queue = ctx.Queue()
    processes = [
        ctx.Process(
            target=_build_process,
            args=(str(root), str(counter), initial_lookup_barrier, result_queue),
        )
        for _ in range(2)
    ]
    for process in processes:
        process.start()
    _join_processes(processes)

    results = [result_queue.get(timeout=3) for _ in processes]
    assert all(process.exitcode == 0 for process in processes)
    assert sorted(item[0] for item in results) == [StoreStatus.BUILT.value, StoreStatus.JOINED.value]
    assert all(item[2] is None for item in results)
    assert len({item[1] for item in results}) == 1
    assert counter.read_text(encoding="utf-8").count("\n") == 1


@pytest.mark.parallel
def test_reader_sees_miss_during_build_and_waiter_has_bounded_timeout(tmp_path: Path) -> None:
    ctx = mp.get_context("spawn")
    root = tmp_path / "store"
    store = _make_store(root)
    identity = _identity()
    started = ctx.Event()
    release = ctx.Event()
    result_queue = ctx.Queue()
    process = ctx.Process(
        target=_controlled_build_process,
        args=(str(root), started, release, result_queue),
    )
    process.start()
    try:
        assert started.wait(timeout=_PROCESS_START_TIMEOUT_SECONDS)
        assert store.lookup(identity, validation=ValidationLevel.FULL_CHECKSUM).status is StoreStatus.MISS
        timed_out = store.get_or_build(
            BuildRequest(identity),
            FakeProducer(identity),
            validation=ValidationLevel.FULL_CHECKSUM,
            deadline=time.monotonic() + 0.1,
        )
        assert timed_out.status is StoreStatus.TIMEOUT
        assert timed_out.failure is not None and timed_out.failure.code is FailureCode.ACTIVE_BUILD_TIMEOUT
    finally:
        release.set()
        _join_processes([process])

    status, error = result_queue.get(timeout=3)
    assert process.exitcode == 0
    assert (status, error) == (StoreStatus.BUILT.value, None)


@pytest.mark.parallel
def test_crashed_builder_leaves_only_invisible_temp_and_next_builder_recovers(tmp_path: Path) -> None:
    ctx = mp.get_context("spawn")
    root = tmp_path / "store"
    store = _make_store(root)
    process = ctx.Process(target=_crash_build_process, args=(str(root),))
    process.start()
    _join_processes([process])

    assert process.exitcode == 17
    assert list(store.tmp_dir.iterdir())
    assert not list(store.artifacts_dir.iterdir())

    identity = _identity()
    recovered = store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )
    assert recovered.status is StoreStatus.BUILT
    assert recovered.lease is not None
    recovered.lease.close()
    assert not list(store.tmp_dir.iterdir())


def test_capacity_and_enospc_failures_are_typed_and_clean_staging(
    tmp_path: Path, monkeypatch: pytest.MonkeyPatch
) -> None:
    identity = _identity()
    limited = _make_store(tmp_path / "limited", capacity=CapacityPolicy(max_artifact_bytes=64))
    too_large = limited.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )
    assert too_large.status is StoreStatus.FAILED
    assert too_large.failure is not None and too_large.failure.code is FailureCode.ARTIFACT_TOO_LARGE
    assert not list(limited.tmp_dir.iterdir())

    no_space = _make_store(tmp_path / "enospc")

    def raise_enospc(_fd: int, _offset: int, _length: int) -> None:
        raise OSError(errno.ENOSPC, "injected no space")

    monkeypatch.setattr(os, "posix_fallocate", raise_enospc)
    failed = no_space.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )
    assert failed.status is StoreStatus.FAILED
    assert failed.failure is not None and failed.failure.code is FailureCode.ENOSPC
    assert not list(no_space.tmp_dir.iterdir())
    assert not list(no_space.artifacts_dir.iterdir())


@pytest.mark.parametrize(
    ("failure_errno", "expected_stage", "expected_code"),
    [
        (errno.ENOSPC, ResolutionStage.CAPACITY, FailureCode.ENOSPC),
        (errno.EDQUOT, ResolutionStage.CAPACITY, FailureCode.ENOSPC),
        (errno.EACCES, ResolutionStage.DOMAIN, FailureCode.DOMAIN_UNAVAILABLE),
        (errno.EIO, ResolutionStage.DOMAIN, FailureCode.DOMAIN_UNAVAILABLE),
    ],
)
def test_staging_directory_failures_are_typed_and_clean(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
    failure_errno: int,
    expected_stage: ResolutionStage,
    expected_code: FailureCode,
) -> None:
    identity = _identity()
    store = _make_store(tmp_path / "store")
    original_mkdir = Path.mkdir

    def fail_staging_mkdir(
        path: Path,
        mode: int = 0o777,
        parents: bool = False,
        exist_ok: bool = False,
    ) -> None:
        if path.parent == store.tmp_dir:
            raise OSError(failure_errno, "injected staging directory failure")
        original_mkdir(path, mode=mode, parents=parents, exist_ok=exist_ok)

    monkeypatch.setattr(Path, "mkdir", fail_staging_mkdir)
    result = store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )

    assert result.status is StoreStatus.FAILED
    assert result.failure is not None
    assert result.failure.stage is expected_stage
    assert result.failure.code is expected_code
    assert result.failure.retryable
    assert not list(store.tmp_dir.iterdir())
    assert not list(store.artifacts_dir.iterdir())


def test_post_producer_staging_io_failure_is_retryable_domain_failure(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    identity = _identity()
    store = _make_store(tmp_path / "store")
    original_fsync_directory = filesystem_store_module._fsync_directory

    def fail_staging_fsync(path: Path) -> None:
        if path.parent == store.tmp_dir:
            raise OSError(errno.EIO, "injected post-producer staging fsync failure")
        original_fsync_directory(path)

    monkeypatch.setattr(filesystem_store_module, "_fsync_directory", fail_staging_fsync)
    result = store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )

    assert result.status is StoreStatus.FAILED
    assert result.failure is not None
    assert result.failure.stage is ResolutionStage.DOMAIN
    assert result.failure.code is FailureCode.DOMAIN_UNAVAILABLE
    assert result.failure.retryable
    assert not list(store.tmp_dir.iterdir())
    assert not list(store.artifacts_dir.iterdir())


def test_async_payload_fsync_eio_is_retryable_domain_failure(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    identity = _identity()
    store = _make_store(tmp_path / "store")
    injection_count = 0

    def fail_payload_fsync(fd: int) -> None:
        nonlocal injection_count
        injection_count += 1
        try:
            raise OSError(errno.EIO, "injected payload-fsync EIO")
        finally:
            os.close(fd)

    with monkeypatch.context() as fault:
        fault.setattr(filesystem_writer_module, "_fsync_payload", fail_payload_fsync)
        failed = store.get_or_build(
            BuildRequest(identity),
            FakeProducer(identity),
            validation=ValidationLevel.FULL_CHECKSUM,
            deadline=time.monotonic() + 10,
        )

    assert injection_count == 1
    assert failed.status is StoreStatus.FAILED
    assert failed.failure is not None
    assert failed.failure.stage is ResolutionStage.DOMAIN
    assert failed.failure.code is FailureCode.DOMAIN_UNAVAILABLE
    assert failed.failure.retryable
    assert "injected payload-fsync EIO" in failed.failure.message
    assert not list(store.tmp_dir.iterdir())
    assert not list(store.artifacts_dir.iterdir())

    recovered = store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )
    assert recovered.status is StoreStatus.BUILT
    assert recovered.lease is not None
    recovered.lease.close()


def test_producer_raised_eio_remains_nonretryable_producer_failure(tmp_path: Path) -> None:
    identity = _identity()
    store = _make_store(tmp_path / "store")

    class FailingProducer(FakeProducer):
        def produce(self, writer: object) -> ProductionMetadata:
            del writer
            raise OSError(errno.EIO, "injected producer failure")

    result = store.get_or_build(
        BuildRequest(identity),
        FailingProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )

    assert result.status is StoreStatus.FAILED
    assert result.failure is not None
    assert result.failure.stage is ResolutionStage.PRODUCTION
    assert result.failure.code is FailureCode.PRODUCER_FAILED
    assert not result.failure.retryable
    assert not list(store.tmp_dir.iterdir())
    assert not list(store.artifacts_dir.iterdir())


def test_store_and_free_space_capacity_limits_fail_before_publication(tmp_path: Path) -> None:
    identity = _identity()
    store_limited = _make_store(tmp_path / "store-limit", capacity=CapacityPolicy(max_store_bytes=1))
    store_result = store_limited.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )
    assert store_result.status is StoreStatus.FAILED
    assert store_result.failure is not None and store_result.failure.code is FailureCode.STORE_LIMIT_EXCEEDED
    assert not list(store_limited.artifacts_dir.iterdir())

    free_root = tmp_path / "free-limit"
    free_root.mkdir(mode=0o700)
    # Leave enough margin for filesystem accounting to move between the
    # preflight measurement and the capacity check.
    unavailable_reserve = shutil.disk_usage(free_root).free + (1 << 30)
    free_limited = _make_store(free_root, capacity=CapacityPolicy(min_free_bytes=unavailable_reserve))
    free_result = free_limited.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )
    assert free_result.status is StoreStatus.FAILED
    assert free_result.failure is not None and free_result.failure.code is FailureCode.INSUFFICIENT_CAPACITY
    assert not list(free_limited.artifacts_dir.iterdir())


def test_domain_capacity_policy_is_authoritative(tmp_path: Path) -> None:
    root = tmp_path / "store"
    _make_store(root, capacity=CapacityPolicy(max_store_bytes=4096))

    with pytest.raises(HostWeightError, match="capacity policy differs"):
        _make_store(root, capacity=CapacityPolicy(max_store_bytes=8192))


@pytest.mark.parametrize("filesystem_type", ["nfs4", "cifs", "lustre", "ceph", "unknownfs"])
def test_remote_and_unknown_filesystems_cannot_back_the_local_store(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
    filesystem_type: str,
) -> None:
    monkeypatch.setattr(filesystem_store_module, "detect_filesystem_type", lambda _path: filesystem_type)
    root = tmp_path / "store"

    with pytest.raises(ValueError, match="not node-local|not recognized"):
        detect_storage_class(root)
    with pytest.raises(HostWeightError) as error:
        FilesystemHostWeightStore(
            StorageDomainPolicy(root=root, storage_class=StorageClass.DISK),
            CapacityPolicy(),
            IntegrityPolicy(),
        )

    assert error.value.failure.code is FailureCode.DOMAIN_POLICY_MISMATCH
    assert not root.exists()


def test_trusted_store_rejects_group_or_world_writable_root(tmp_path: Path) -> None:
    root = tmp_path / "untrusted"
    root.mkdir(mode=0o700)
    root.chmod(0o777)

    with pytest.raises(HostWeightError) as error:
        FilesystemHostWeightStore(
            StorageDomainPolicy(root=root, storage_class=detect_storage_class(root)),
            CapacityPolicy(),
            IntegrityPolicy(),
        )

    assert error.value.failure.code is FailureCode.DOMAIN_UNAVAILABLE


def test_unimplemented_coordination_and_fs_verity_return_typed_failures(tmp_path: Path) -> None:
    identity = _identity()
    store = _make_store(tmp_path / "store")

    unsupported_producer = store.get_or_build(
        BuildRequest(identity),
        FakeProducer(identity, coordination_scope=CoordinationScope.GROUP_COHORT),
        validation=ValidationLevel.FULL_CHECKSUM,
        deadline=time.monotonic() + 10,
    )
    assert unsupported_producer.status is StoreStatus.FAILED
    assert unsupported_producer.failure is not None
    assert unsupported_producer.failure.code is FailureCode.PRODUCER_UNSUPPORTED

    fs_verity = store.lookup(identity, validation=ValidationLevel.FS_VERITY)
    assert fs_verity.status is StoreStatus.FAILED
    assert fs_verity.failure is not None and fs_verity.failure.code is FailureCode.UNSUPPORTED


def test_unimplemented_numa_enforcement_and_background_scrub_fail_explicitly(tmp_path: Path) -> None:
    numa_root = tmp_path / "numa"
    numa_root.mkdir(mode=0o700)
    with pytest.raises(HostWeightError) as numa_error:
        FilesystemHostWeightStore(
            StorageDomainPolicy(
                root=numa_root,
                scope=StorageScope.NUMA,
                storage_class=detect_storage_class(numa_root),
                numa_prefault=True,
            ),
            CapacityPolicy(),
            IntegrityPolicy(),
        )
    assert numa_error.value.failure.code is FailureCode.UNSUPPORTED

    with pytest.raises(HostWeightError) as scrub_error:
        _make_store(tmp_path / "scrub", integrity=IntegrityPolicy(background_scrub=True))
    assert scrub_error.value.failure.code is FailureCode.UNSUPPORTED