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import json
import os
import struct
import tempfile
import unittest
from pathlib import Path
from unittest.mock import patch
from lumi_eggcracker.artifacts import (
from_argv_paths,
from_mapped_files,
from_process_fds,
from_snapshot,
validate_gguf_fd,
validate_path,
)
from lumi_eggcracker.discovery import ProcessIdentity
from lumi_eggcracker.jsonio import JsonInputError
from lumi_eggcracker.procfd import (
MAX_PROC_MAP_BYTES,
StableFileMetadata,
executable_mapping_references,
unique_mapping_references,
)
def gguf(*, version: int = 3, tensors: int = 1, metadata: int = 0, padding: int = 64) -> bytes:
return b"GGUF" + struct.pack("<IQQ", version, tensors, metadata) + b"\0" * padding
def safetensors(*, dtype: str = "F32", shape: list[int] | None = None, offsets: tuple[int, int] = (0, 8), metadata: dict[str, str] | None = None) -> bytes:
value: dict[str, object] = {
"tensor": {"dtype": dtype, "shape": shape if shape is not None else [2], "data_offsets": list(offsets)}
}
if metadata is not None:
value["__metadata__"] = metadata
header = json.dumps(value, separators=(",", ":")).encode("utf-8")
header += b" " * ((8 - len(header) % 8) % 8)
return struct.pack("<Q", len(header)) + header + b"\0" * max(0, offsets[1])
class ArtifactTests(unittest.TestCase):
def test_extensionless_absolute_argv_model_path_is_inspected(self) -> None:
with tempfile.TemporaryDirectory() as raw:
path = Path(raw) / "sha256-content-addressed-blob"
path.write_bytes(gguf())
sample = type(
"Snapshot",
(),
{"argv": ("runner", "--model", str(path), "--offline")},
)()
evidence = from_argv_paths(sample)
self.assertEqual(("gguf-v3",), tuple(item.evidence_id for item in evidence))
def test_model_directory_argv_path_is_inspected_one_level_deep(self) -> None:
with tempfile.TemporaryDirectory() as raw:
directory = Path(raw) / "model-store"
directory.mkdir()
(directory / "config.json").write_text("{}", encoding="utf-8")
(directory / "model.safetensors").write_bytes(safetensors())
sample = type("Snapshot", (), {"argv": ("python", "--model", str(directory))})()
evidence = from_argv_paths(sample)
self.assertEqual(("safetensors-v1",), tuple(item.evidence_id for item in evidence))
def test_argv_probe_does_not_accept_name_or_embedded_marker(self) -> None:
with tempfile.TemporaryDirectory() as raw:
path = Path(raw) / "not-a-model"
path.write_bytes(b"GGUF model marker only")
sample = type("Snapshot", (), {"argv": ("runner", f"--model={path}")})()
self.assertEqual((), from_argv_paths(sample))
def test_executable_mapping_parser_excludes_data_maps_and_binds_mount(self) -> None:
with tempfile.TemporaryDirectory() as raw:
proc = Path(raw)
root = proc / "42"
root.mkdir()
(root / "maps").write_text(
"1000-2000 r--p 00000000 00:2a 11 /data\n"
"3000-4000 r-xp 00001000 00:2a 12 /runtime\n",
encoding="utf-8",
)
(root / "mountinfo").write_text(
"77 1 0:42 / /mnt/c rw - 9p drvfs rw\n", encoding="utf-8"
)
self.assertEqual(
(("3000-4000", 12, (77,)),),
tuple(
(item.name, item.inode, item.mount_ids)
for item in executable_mapping_references(42, proc=proc)
),
)
def test_executable_mapping_parser_does_not_truncate_at_4096_lines(self) -> None:
with tempfile.TemporaryDirectory() as raw:
proc = Path(raw)
root = proc / "42"
root.mkdir()
lines = [
f"{index + 1:x}-{index + 2:x} r-xp 00000000 00:2a {index + 1} /decoy/{index}\n"
for index in range(4286)
]
lines.append("20000-21000 r-xp 00000000 00:2a 9001 /runtime\n")
(root / "maps").write_text("".join(lines), encoding="utf-8")
(root / "mountinfo").write_text("", encoding="utf-8")
references = executable_mapping_references(42, proc=proc)
self.assertEqual(4287, len(references))
self.assertEqual(9001, references[-1].inode)
def test_oversized_mapping_table_fails_explicitly(self) -> None:
with tempfile.TemporaryDirectory() as raw:
proc = Path(raw)
root = proc / "42"
root.mkdir()
(root / "maps").write_bytes(b"x" * (MAX_PROC_MAP_BYTES + 1))
with self.assertRaisesRegex(JsonInputError, "bounded inspection limit"):
executable_mapping_references(42, proc=proc)
def test_mapping_segments_are_deduplicated_by_stable_inode(self) -> None:
with tempfile.TemporaryDirectory() as raw:
proc = Path(raw)
mappings = proc / "42" / "map_files"
mappings.mkdir(parents=True)
first = mappings / "1-2"
first.write_bytes(b"runtime")
os.link(first, mappings / "2-3")
(mappings / "3-4").write_bytes(b"other")
self.assertEqual(
("1-2", "3-4"), unique_mapping_references(42, proc=proc)
)
def test_readable_deleted_drvfs_duplicate_does_not_require_fstat(self) -> None:
with tempfile.TemporaryDirectory() as raw:
path = Path(raw) / "model"
path.write_bytes(gguf())
descriptor = os.open(path, os.O_RDONLY)
try:
fallback = StableFileMetadata(7, 11, path.stat().st_size)
with patch(
"lumi_eggcracker.artifacts.os.fstat",
side_effect=FileNotFoundError(2, "deleted DrvFS descriptor"),
):
evidence = validate_gguf_fd(descriptor, fallback=fallback)
finally:
os.close(descriptor)
self.assertEqual("gguf-v3", evidence.evidence_id)
self.assertEqual((7, 11), (evidence.device, evidence.inode))
def test_mapping_windows_eventually_cover_model_after_fd_close(self) -> None:
with tempfile.TemporaryDirectory() as raw:
proc = Path(raw)
mappings = proc / "42" / "map_files"
mappings.mkdir(parents=True)
for index in range(65):
(mappings / f"{index + 1:x}-{index + 2:x}").write_bytes(b"not a model")
(mappings / "3f-40").write_bytes(gguf())
sample = type(
"Snapshot",
(),
{"identity": type("Identity", (), {"pid": 42})()},
)()
self.assertEqual((), from_mapped_files(sample, proc=proc, start_index=0))
evidence = from_mapped_files(sample, proc=proc, start_index=64)
self.assertEqual(("gguf-v3",), tuple(item.evidence_id for item in evidence))
def test_descriptor_windows_eventually_cover_late_model_fd(self) -> None:
with tempfile.TemporaryDirectory() as raw:
proc = Path(raw)
directory = proc / "42" / "fd"
directory.mkdir(parents=True)
for number in range(20):
(directory / str(number)).write_bytes(b"harmless")
(directory / "18").write_bytes(gguf())
sample = type("Snapshot", (), {"identity": ProcessIdentity(42, 100), "fd_entries": ()})()
self.assertEqual(
(), from_process_fds(sample, proc=proc, start_index=0, max_probes=16)
)
evidence = from_process_fds(
sample, proc=proc, start_index=16, max_probes=16
)
self.assertEqual({"gguf-v3"}, {item.evidence_id for item in evidence})
def test_descriptor_stripe_always_samples_highest_fd(self) -> None:
with tempfile.TemporaryDirectory() as raw:
proc = Path(raw)
directory = proc / "42" / "fd"
directory.mkdir(parents=True)
for number in range(704):
(directory / str(number)).write_bytes(b"harmless")
(directory / "703").write_bytes(gguf())
sample = type(
"Snapshot", (), {"identity": ProcessIdentity(42, 100), "fd_entries": ()}
)()
evidence = from_process_fds(sample, proc=proc, start_index=0, max_probes=64)
self.assertEqual({"gguf-v3"}, {item.evidence_id for item in evidence})
def test_valid_gguf_content_does_not_depend_on_filename(self) -> None:
with tempfile.TemporaryDirectory() as raw:
path = Path(raw) / "opaque-input"
path.write_bytes(gguf())
evidence = validate_path(path)
self.assertIsNotNone(evidence)
assert evidence is not None
self.assertEqual("gguf-v3", evidence.evidence_id)
self.assertNotIn(path.name, evidence.header_sha256)
def test_bad_magic_version_and_impossible_counts_do_not_qualify(self) -> None:
with tempfile.TemporaryDirectory() as raw:
root = Path(raw)
for index, body in enumerate(
(b"NOPE" + gguf()[4:], gguf(version=1), gguf(tensors=1_000_000, padding=1))
):
path = root / str(index)
path.write_bytes(body)
self.assertIsNone(validate_path(path))
def test_ai_looking_filename_is_not_content_evidence(self) -> None:
with tempfile.TemporaryDirectory() as raw:
path = Path(raw) / "model.gguf"
path.write_bytes(b"not a model")
self.assertIsNone(validate_path(path))
def test_symlink_and_non_regular_files_do_not_qualify(self) -> None:
with tempfile.TemporaryDirectory() as raw:
root = Path(raw)
target = root / "target"
link = root / "link"
target.write_bytes(gguf())
try:
os.symlink(target, link)
except OSError as error:
self.skipTest(f"symlinks unavailable: {error}")
self.assertIsNone(validate_path(link))
def test_valid_safetensors_is_extension_and_metadata_independent(self) -> None:
with tempfile.TemporaryDirectory() as raw:
path = Path(raw) / "opaque-input"
path.write_bytes(safetensors(metadata={"format": "pt"}))
evidence = validate_path(path)
self.assertIsNotNone(evidence)
assert evidence is not None
self.assertEqual("safetensors-v1", evidence.evidence_id)
self.assertEqual("SAFETENSORS", evidence.format)
def test_safetensors_rejects_duplicate_invalid_and_partial_headers(self) -> None:
with tempfile.TemporaryDirectory() as raw:
root = Path(raw)
duplicate = b'{"tensor":{"dtype":"F32","shape":[2],"data_offsets":[0,8]},"tensor":{}}'
duplicate_file = root / "duplicate"
duplicate_file.write_bytes(struct.pack("<Q", len(duplicate)) + duplicate + b"\0" * 8)
invalid_dtype = root / "dtype"
invalid_dtype.write_bytes(safetensors(dtype="F128"))
invalid_range = root / "range"
invalid_range.write_bytes(safetensors(offsets=(0, 4)))
truncated = root / "truncated"
truncated.write_bytes(struct.pack("<Q", 1024) + b"{}")
for path in (duplicate_file, invalid_dtype, invalid_range, truncated):
self.assertIsNone(validate_path(path))
def test_safetensors_duplicate_names_follow_reference_loader_last_value(self) -> None:
with tempfile.TemporaryDirectory() as raw:
path = Path(raw) / "duplicate-loader-accepted"
header = (
b'{"x":{"dtype":"U8","shape":[1],"data_offsets":[0,1]},'
b'"x":{"dtype":"U8","shape":[1],"data_offsets":[0,1]}}'
)
path.write_bytes(struct.pack("<Q", len(header)) + header + b"x")
evidence = validate_path(path)
self.assertIsNotNone(evidence)
assert evidence is not None
self.assertEqual("safetensors-v1", evidence.evidence_id)
def test_safetensors_allows_scalar_and_zero_dimension_tensors(self) -> None:
with tempfile.TemporaryDirectory() as raw:
root = Path(raw)
scalar = root / "scalar"
scalar.write_bytes(safetensors(shape=[], offsets=(0, 4))[:-4] + b"\0" * 4)
zero = root / "zero"
zero.write_bytes(safetensors(shape=[0], offsets=(0, 0)))
self.assertIsNotNone(validate_path(scalar))
self.assertIsNotNone(validate_path(zero))
def test_safetensors_requires_complete_contiguous_data_layout(self) -> None:
with tempfile.TemporaryDirectory() as raw:
root = Path(raw)
def write(value: dict[str, object], body: bytes, name: str) -> Path:
header = json.dumps(value, separators=(",", ":")).encode("utf-8")
header += b" " * ((8 - len(header) % 8) % 8)
path = root / name
path.write_bytes(struct.pack("<Q", len(header)) + header + body)
return path
hole = write(
{
"left": {"dtype": "F32", "shape": [1], "data_offsets": [0, 4]},
"right": {"dtype": "F32", "shape": [1], "data_offsets": [8, 12]},
},
b"\0" * 12,
"hole",
)
trailing = write(
{"tensor": {"dtype": "F32", "shape": [1], "data_offsets": [0, 4]}},
b"\0" * 8,
"trailing",
)
overlap = write(
{
"left": {"dtype": "F32", "shape": [1], "data_offsets": [0, 4]},
"right": {"dtype": "F32", "shape": [1], "data_offsets": [2, 6]},
},
b"\0" * 6,
"overlap",
)
out_of_order = write(
{
"right": {"dtype": "F32", "shape": [1], "data_offsets": [4, 8]},
"left": {"dtype": "F32", "shape": [1], "data_offsets": [0, 4]},
},
b"\0" * 8,
"out-of-order",
)
self.assertIsNone(validate_path(hole))
self.assertIsNone(validate_path(trailing))
self.assertIsNone(validate_path(overlap))
self.assertIsNotNone(validate_path(out_of_order))
@unittest.skipUnless(os.name == "posix", "stable absolute paths are Linux-only")
def test_artifact_cache_reuses_stable_inode_result(self) -> None:
with tempfile.TemporaryDirectory() as raw:
path = Path(raw) / "model"
path.write_bytes(gguf())
sample = type(
"Snapshot",
(),
{"identity": object(), "fd_entries": (), "map_paths": (str(path),)},
)()
cache: dict[tuple[int, int, int, int, int], object] = {}
first = from_snapshot(sample, cache=cache)
second = from_snapshot(sample, cache=cache)
self.assertEqual(first, second)
self.assertEqual(1, len(cache))
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