fix(hunt): label every verified target of a change; undo an inherited sparse-checkout in the worktree

label_rows honoured only a change's primary site, so 43 of the 48 accepted access-control
locations were unlabelled; every entry of targets is now a positive with its own label_ref and
span. The training clones were emptied with sparse-checkout to save disk and a new worktree
inherits it: every file read failed and the source and semantic producers reported an unread tree
on all 599 rows. The runner now disables sparse-checkout in the worktree it adds.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

src/openultrasast/hunt/labels.py

@@ -16,21 +16,30 @@ def label_rows(rows: Sequence[Mapping[str, Any]], change: Mapping[str, Any]) ->
         raise ValueError("a label needs a traceable case_id")
     if kind == "vulnerability" and not all(change.get(k) for k in ("path", "function", "function_lines", "family")):
         raise ValueError("a vulnerability label needs its path, function, span and family")
+    # Every verified site of the change is a positive: the primary one and, when several accepted
+    # locations share the fix commit, each entry of ``targets``.
+    sites = []
+    if kind == "vulnerability":
+        sites.append((change["path"], change["function"], list(change["function_lines"]), change["case_id"]))
+        for target in change.get("targets", []):
+            sites.append((target["path"], target["function"], list(target["function_lines"]), target.get("case_id", change["case_id"])))
     result = []
     for row in rows:
         data = deepcopy(dict(row))
-        span = change.get("function_lines")
         function = row.get("function", row.get("feature.source.function"))
-        site = (
-            kind == "vulnerability"
-            and row.get("path") == change["path"]
-            and (function == change["function"] or (span[0] <= row.get("line", 0) <= span[1]))
+        matched = next(
+            (
+                site
+                for site in sites
+                if row.get("path") == site[0] and (function == site[1] or (site[2][0] <= row.get("line", 0) <= site[2][1]))
+            ),
+            None,
         )
         data.update(
-            label=1 if site else 0 if kind == "ordinary" else None,
-            family=change["family"] if site else None,
-            fix_span=list(span) if site else None,
-            label_ref=change["case_id"] if site or kind == "ordinary" else None,
+            label=1 if matched else 0 if kind == "ordinary" else None,
+            family=change["family"] if matched else None,
+            fix_span=matched[2] if matched else None,
+            label_ref=matched[3] if matched else change["case_id"] if kind == "ordinary" else None,
             verification=None,
         )
         result.append(data)

src/openultrasast/hunt/runner.py

@@ -118,6 +118,7 @@ def hunt_change(
             try:
                 _git(repo_root, "worktree", "add", "--detach", str(root), change["head"])
                 added = True
+                _full_checkout(root)
                 if _git(root, "rev-parse", "HEAD").strip() != change["head"]:
                     raise InstrumentFailure("head_mismatch")
                 instrument["head_verified"] = True
@@ -160,6 +161,19 @@ def hunt_change(
     return record
 
 
+def _full_checkout(root: Path) -> None:
+    """Undo a sparse-checkout a worktree inherits from a clone whose working tree was emptied to save disk.
+
+    Without this every file read fails and the producers report an unread tree, which must never pass as a
+    clean result."""
+    try:
+        sparse = _git(root, "config", "--get", "core.sparseCheckout").strip()
+    except subprocess.CalledProcessError:
+        return
+    if sparse == "true":
+        _git(root, "sparse-checkout", "disable")
+
+
 def _function_at(root: Path, finding: Mapping[str, Any]) -> str | None:
     try:
         path = str(finding["path"])

tests/test_hunt_labels.py

@@ -45,3 +45,22 @@ def test_positive_requires_traceable_reference():
     del change["case_id"]
     with pytest.raises(ValueError, match="case_id"):
         label_rows([], change)
+
+
+def test_every_verified_target_of_a_change_is_a_positive():
+    change = {
+        **positive(),
+        "case_id": "c1",
+        "targets": [
+            {"case_id": "c1", "path": "app.py", "function": "handle", "function_lines": [10, 20]},
+            {"case_id": "c2", "path": "lib.py", "function": "check", "function_lines": [3, 8]},
+        ],
+    }
+    rows = [
+        {"path": "app.py", "line": 12, "function": "handle"},
+        {"path": "lib.py", "line": 5, "function": "check"},
+        {"path": "lib.py", "line": 40, "function": "other"},
+    ]
+    out = label_rows(rows, change)
+    assert [r["label"] for r in out] == [1, 1, None]
+    assert out[1]["label_ref"] == "c2" and out[1]["fix_span"] == [3, 8] and out[2]["label_ref"] is None