fix(protocols): re-add get_all_labware_definitions (#17077)

api/src/opentrons/protocols/api_support/util.py

@@ -391,3 +391,13 @@ def _check_version_wrapper(*args: Any, **kwargs: Any) -> Any:
         return cast(FuncT, _check_version_wrapper)
 
     return _set_version
+
+
+class ModifiedList(list[str]):
+    def __contains__(self, item: object) -> bool:
+        if not isinstance(item, str):
+            return False
+        for name in self:
+            if name == item.replace("-", "_").lower():
+                return True
+        return False

api/src/opentrons/protocols/labware.py

@@ -2,13 +2,15 @@
 
 import logging
 import json
+import os
 
 from pathlib import Path
-from typing import Any, AnyStr, Dict, Optional, Union
+from typing import Any, AnyStr, Dict, Optional, Union, List
 
 import jsonschema  # type: ignore
 
 from opentrons_shared_data import load_shared_data, get_shared_data_root
+from opentrons.protocols.api_support.util import ModifiedList
 from opentrons.protocols.api_support.constants import (
     OPENTRONS_NAMESPACE,
     CUSTOM_NAMESPACE,
@@ -61,6 +63,27 @@ def get_labware_definition(
     return _get_standard_labware_definition(load_name, namespace, version)
 
 
+def get_all_labware_definitions() -> List[str]:
+    """
+    Return a list of standard and custom labware definitions with load_name +
+        name_space + version existing on the robot
+    """
+    labware_list = ModifiedList()
+
+    def _check_for_subdirectories(path: Union[str, Path, os.DirEntry[str]]) -> None:
+        with os.scandir(path) as top_path:
+            for sub_dir in top_path:
+                if sub_dir.is_dir():
+                    labware_list.append(sub_dir.name)
+
+    # check for standard labware
+    _check_for_subdirectories(get_shared_data_root() / STANDARD_DEFS_PATH)
+    # check for custom labware
+    for namespace in os.scandir(USER_DEFS_PATH):
+        _check_for_subdirectories(namespace)
+    return labware_list
+
+
 def save_definition(
     labware_def: LabwareDefinition, force: bool = False, location: Optional[Path] = None
 ) -> None: