File size: 11,880 Bytes
767a051 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 | """Verification of the 0.4.2 literal-only handoff boundary."""
from __future__ import annotations
import hashlib
import json
from pathlib import Path
from typing import Any, Mapping
from tom_world03.canonical import attach_hash, require_hash
from .model import BASE_HANDOFF_HASH, BASE_WORLD_HASH, CANONICAL_SEED_SHA256
HANDOFF_SCHEMA = "TOM-LITERAL-HANDOFF-0.4.2"
CORRECTIVE_HANDOFF_SCHEMA = "TOM-CORRECTIVE-HANDOFF-0.5.1"
def _sha256(path: Path) -> str:
h = hashlib.sha256()
with path.open("rb") as handle:
for chunk in iter(lambda: handle.read(1024 * 1024), b""):
h.update(chunk)
return "sha256:" + h.hexdigest()
def verify_literal_handoff(root: str | Path, handoff_path: str | Path | None = None) -> dict[str, Any]:
base = Path(root).resolve()
path = Path(handoff_path).resolve() if handoff_path is not None else base / "sources/TOM_LITERAL_HANDOFF_0_4_2.json"
handoff = json.loads(path.read_text(encoding="utf-8"))
require_hash(handoff, label="literal handoff")
if handoff.get("schema") != HANDOFF_SCHEMA:
raise ValueError(f"literal handoff schema must be {HANDOFF_SCHEMA}")
if handoff.get("content_hash") != BASE_HANDOFF_HASH:
raise ValueError("literal handoff identity differs from the learner base binding")
if handoff.get("semantic_change") is not False:
raise ValueError("0.4.2 literal handoff must declare no semantic change")
if handoff.get("canonical_seed_sha256") != "sha256:" + CANONICAL_SEED_SHA256:
raise ValueError("literal handoff canonical seed binding mismatch")
records = handoff.get("authoritative_files")
if not isinstance(records, list) or not records:
raise ValueError("literal handoff requires authoritative_files")
results: list[dict[str, Any]] = []
errors: list[str] = []
paths: set[str] = set()
for item in records:
if not isinstance(item, Mapping):
errors.append("authoritative file entry is not an object")
continue
rel = str(item.get("path", ""))
if not rel or rel.startswith("/") or ".." in Path(rel).parts:
errors.append(f"unsafe authoritative path {rel!r}")
continue
if rel in paths:
errors.append(f"duplicate authoritative path {rel}")
continue
paths.add(rel)
candidate = base / rel
expected_size = int(item.get("bytes", -1))
expected_hash = str(item.get("sha256", ""))
exists = candidate.is_file()
actual_size = candidate.stat().st_size if exists else None
actual_hash = _sha256(candidate) if exists else None
equal = exists and actual_size == expected_size and actual_hash == expected_hash
if not equal:
errors.append(
f"authoritative file mismatch {rel}: expected {expected_size}/{expected_hash}, "
f"actual {actual_size}/{actual_hash}"
)
results.append({
"path": rel,
"expected_bytes": expected_size,
"actual_bytes": actual_size,
"expected_sha256": expected_hash,
"actual_sha256": actual_hash,
"equal": equal,
})
seed = base / "TOM_seed_genome_2026-09-01.txt"
seed_ok = seed.is_file() and seed.stat().st_size == 244 and not seed.read_bytes().endswith((b"\n", b"\r")) and _sha256(seed) == "sha256:" + CANONICAL_SEED_SHA256
if not seed_ok:
errors.append("canonical seed bytes fail the literal handoff contract")
return attach_hash({
"schema": "TOM-LITERAL-HANDOFF-VERIFICATION-0.4.2",
"handoff_hash": handoff["content_hash"],
"base_world_hash": BASE_WORLD_HASH,
"root": base.name,
"authoritative_file_count": len(records),
"canonical_seed_verified": seed_ok,
"files": results,
"valid": not errors,
"errors": errors,
})
def _safe_relative(value: Any, *, label: str) -> str:
rel = str(value)
parts = Path(rel).parts
if not rel or Path(rel).is_absolute() or ".." in parts:
raise ValueError(f"unsafe {label} path {rel!r}")
return rel
def verify_corrective_handoff(
root: str | Path,
corrective_path: str | Path | None = None,
) -> dict[str, Any]:
"""Verify the 0.4.2 base plus explicit, byte-preserved 0.5.1 changes.
This does not relabel modified files as an unchanged 0.4.2 handoff. Every
replaced base file is checked against both its original literal bytes and
its declared corrective bytes, while every other base file must remain
byte-identical in place.
"""
base = Path(root).resolve()
base_path = base / "sources/TOM_LITERAL_HANDOFF_0_4_2.json"
overlay_path = (
Path(corrective_path).resolve()
if corrective_path is not None
else base / "sources/TOM_CORRECTIVE_HANDOFF_0_5_1.json"
)
old = json.loads(base_path.read_text(encoding="utf-8"))
require_hash(old, label="literal handoff")
if old.get("schema") != HANDOFF_SCHEMA or old.get("content_hash") != BASE_HANDOFF_HASH:
raise ValueError("corrective handoff base identity mismatch")
corrective = json.loads(overlay_path.read_text(encoding="utf-8"))
require_hash(corrective, label="corrective handoff")
if corrective.get("schema") != CORRECTIVE_HANDOFF_SCHEMA:
raise ValueError(f"corrective handoff schema must be {CORRECTIVE_HANDOFF_SCHEMA}")
if corrective.get("base_handoff_hash") != BASE_HANDOFF_HASH:
raise ValueError("corrective handoff does not bind the 0.4.2 base")
if corrective.get("canonical_seed_sha256") != "sha256:" + CANONICAL_SEED_SHA256:
raise ValueError("corrective handoff canonical seed binding mismatch")
if corrective.get("semantic_change") is not True:
raise ValueError("0.5.1 corrective handoff must declare its semantic change")
old_records = old.get("authoritative_files")
replacements = corrective.get("replacements")
additions = corrective.get("additions")
if not isinstance(old_records, list) or not old_records:
raise ValueError("base handoff requires authoritative_files")
if not isinstance(replacements, list) or not replacements:
raise ValueError("corrective handoff requires replacements")
if not isinstance(additions, list) or not additions:
raise ValueError("corrective handoff requires additions")
old_by_path = {str(item.get("path")): item for item in old_records if isinstance(item, Mapping)}
replacement_by_path: dict[str, Mapping[str, Any]] = {}
errors: list[str] = []
replacement_results: list[dict[str, Any]] = []
for item in replacements:
if not isinstance(item, Mapping):
errors.append("replacement entry is not an object")
continue
try:
rel = _safe_relative(item.get("path"), label="replacement")
prior_rel = _safe_relative(item.get("prior_copy"), label="prior-copy")
except ValueError as exc:
errors.append(str(exc))
continue
if rel in replacement_by_path:
errors.append(f"duplicate replacement path {rel}")
continue
replacement_by_path[rel] = item
inherited = old_by_path.get(rel)
prior_bytes = int(item.get("prior_bytes", -1))
prior_hash = str(item.get("prior_sha256", ""))
current_bytes = int(item.get("bytes", -1))
current_hash = str(item.get("sha256", ""))
base_binding_equal = bool(
inherited
and inherited.get("bytes") == prior_bytes
and inherited.get("sha256") == prior_hash
)
prior = base / prior_rel
current = base / rel
prior_equal = bool(
prior.is_file()
and prior.stat().st_size == prior_bytes
and _sha256(prior) == prior_hash
)
current_equal = bool(
current.is_file()
and current.stat().st_size == current_bytes
and _sha256(current) == current_hash
)
if not base_binding_equal:
errors.append(f"replacement prior binding differs from base handoff: {rel}")
if not prior_equal:
errors.append(f"preserved prior bytes mismatch: {prior_rel}")
if not current_equal:
errors.append(f"corrective replacement bytes mismatch: {rel}")
replacement_results.append({
"path": rel,
"prior_copy": prior_rel,
"base_binding_equal": base_binding_equal,
"prior_bytes_equal": prior_equal,
"corrective_bytes_equal": current_equal,
"prior_sha256": prior_hash,
"corrective_sha256": current_hash,
"reason": item.get("reason"),
})
unchanged_results: list[dict[str, Any]] = []
for rel, item in sorted(old_by_path.items()):
if rel in replacement_by_path:
continue
try:
safe = _safe_relative(rel, label="base-authority")
except ValueError as exc:
errors.append(str(exc))
continue
path = base / safe
equal = bool(
path.is_file()
and path.stat().st_size == int(item.get("bytes", -1))
and _sha256(path) == str(item.get("sha256", ""))
)
if not equal:
errors.append(f"unchanged base authority mismatch: {rel}")
unchanged_results.append({"path": rel, "equal": equal})
if set(replacement_by_path) - set(old_by_path):
errors.append("corrective replacement names a path absent from the base handoff")
addition_results: list[dict[str, Any]] = []
addition_paths: set[str] = set()
for item in additions:
if not isinstance(item, Mapping):
errors.append("addition entry is not an object")
continue
try:
rel = _safe_relative(item.get("path"), label="addition")
except ValueError as exc:
errors.append(str(exc))
continue
if rel in addition_paths or rel in old_by_path:
errors.append(f"duplicate or inherited addition path {rel}")
continue
addition_paths.add(rel)
path = base / rel
equal = bool(
path.is_file()
and path.stat().st_size == int(item.get("bytes", -1))
and _sha256(path) == str(item.get("sha256", ""))
)
if not equal:
errors.append(f"corrective addition bytes mismatch: {rel}")
addition_results.append({
"path": rel,
"bytes": item.get("bytes"),
"sha256": item.get("sha256"),
"equal": equal,
"role": item.get("role"),
})
seed = base / "TOM_seed_genome_2026-09-01.txt"
seed_ok = bool(
seed.is_file()
and seed.stat().st_size == 244
and not seed.read_bytes().endswith((b"\n", b"\r"))
and _sha256(seed) == "sha256:" + CANONICAL_SEED_SHA256
)
if not seed_ok:
errors.append("canonical seed bytes fail the corrective handoff contract")
return attach_hash({
"schema": "TOM-CORRECTIVE-HANDOFF-VERIFICATION-0.5.1",
"base_handoff_hash": old["content_hash"],
"handoff_hash": old["content_hash"],
"corrective_handoff_hash": corrective["content_hash"],
"base_world_hash": BASE_WORLD_HASH,
"root": base.name,
"canonical_seed_verified": seed_ok,
"base_authoritative_file_count": len(old_records),
"unchanged_base_file_count": len(unchanged_results),
"replacement_count": len(replacement_results),
"addition_count": len(addition_results),
"unchanged_files": unchanged_results,
"replacements": replacement_results,
"additions": addition_results,
"valid": not errors,
"errors": errors,
})
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