Reject invalid preset CLI entries (#1579)

* Reject invalid preset CLI entries

* Use modern preset CLI test loader

scripts/odysseus-preset

@@ -49,6 +49,15 @@ def _save(data: dict) -> None:
     tmp.replace(_PATH)
 
 
+def _entry_or_fail(presets: dict, name: str) -> dict:
+    if name not in presets:
+        fail(f"no preset named {name!r}")
+    entry = presets[name]
+    if not isinstance(entry, dict):
+        fail(f"preset {name!r} is corrupt: expected an object")
+    return entry
+
+
 def cmd_list(args):
     presets = _load()
     rows = []
@@ -66,9 +75,7 @@ def cmd_list(args):
 
 def cmd_get(args):
     presets = _load()
-    if args.name not in presets:
-        fail(f"no preset named {args.name!r}")
-    emit({"id": args.name, **presets[args.name]}, args)
+    emit({"id": args.name, **_entry_or_fail(presets, args.name)}, args)
 
 
 def cmd_set(args):
@@ -93,9 +100,8 @@ def cmd_set(args):
 
 def cmd_delete(args):
     presets = _load()
-    if args.name not in presets:
-        fail(f"no preset named {args.name!r}")
-    snap = presets.pop(args.name)
+    snap = _entry_or_fail(presets, args.name)
+    presets.pop(args.name)
     _save(presets)
     emit({"ok": True, "deleted": {"id": args.name, **snap}}, args)
 

tests/test_preset_cli_invalid_entries.py

@@ -0,0 +1,29 @@
+import importlib.machinery
+import importlib.util
+from pathlib import Path
+
+
+def _load_preset_cli():
+    path = Path(__file__).resolve().parent.parent / "scripts" / "odysseus-preset"
+    loader = importlib.machinery.SourceFileLoader("odysseus_preset_invalid_entries", str(path))
+    spec = importlib.util.spec_from_loader(loader.name, loader)
+    module = importlib.util.module_from_spec(spec)
+    loader.exec_module(module)
+    return module
+
+
+def test_entry_or_fail_rejects_non_object_entries():
+    cli = _load_preset_cli()
+
+    try:
+        cli._entry_or_fail({"broken": "raw prompt"}, "broken")
+    except SystemExit as exc:
+        assert exc.code == 1
+    else:
+        raise AssertionError("expected invalid preset entry to exit")
+
+
+def test_entry_or_fail_returns_valid_entry():
+    cli = _load_preset_cli()
+
+    assert cli._entry_or_fail({"ok": {"name": "ok"}}, "ok") == {"name": "ok"}