fix(shared-data): handle bad files in pipette defs

We are iterating through pipette definitions on disk but not really
handlign the possibility that you might have random files or dirs in
there. Now we do, and you can drop .DS_Store to your heart's content.

Closes RQA-2726

shared-data/python/opentrons_shared_data/pipette/load_data.py

@@ -1,7 +1,9 @@
 import json
 import os
+from pathlib import Path
+from logging import getLogger
 
-from typing import Dict, Any, Union, Optional, List
+from typing import Dict, Any, Union, Optional, List, Iterator
 from typing_extensions import Literal
 from functools import lru_cache
 
@@ -26,6 +28,7 @@
 
 LoadedConfiguration = Dict[str, Union[str, Dict[str, Any]]]
 
+LOG = getLogger(__name__)
 
 def _get_configuration_dictionary(
     config_type: Literal["general", "geometry", "liquid"],
@@ -95,6 +98,11 @@ def _physical(
 ) -> LoadedConfiguration:
     return _get_configuration_dictionary("general", channels, model, version)
 
+def _dirs_in(path: Path) -> Iterator[Path]:
+    for child in path.iterdir():
+        if child.is_dir():
+            yield child
+
 
 @lru_cache(maxsize=None)
 def load_serial_lookup_table() -> Dict[str, str]:
@@ -112,23 +120,27 @@ def load_serial_lookup_table() -> Dict[str, str]:
         "eight_channel": "multi",
     }
     _model_shorthand = {"p1000": "p1k", "p300": "p3h"}
-    for channel_dir in os.listdir(config_path):
-        for model_dir in os.listdir(config_path / channel_dir):
-            for version_file in os.listdir(config_path / channel_dir / model_dir):
-                version_list = version_file.split(".json")[0].split("_")
-                built_model = f"{model_dir}_{_channel_model_str[channel_dir]}_v{version_list[0]}.{version_list[1]}"
-
-                model_shorthand = _model_shorthand.get(model_dir, model_dir)
-
+    for channel_dir in _dirs_in(config_path):
+        for model_dir in _dirs_in(channel_dir):
+            for version_file in model_dir.iterdir():
+                if version_file.suffix != '.json':
+                    continue
+                try:
+                    version_list = version_file.stem.split("_")
+                    built_model = f"{model_dir.stem}_{_channel_model_str[channel_dir.stem]}_v{version_list[0]}.{version_list[1]}"
+                except IndexError:
+                    LOG.warning(f'Pipette def with bad name {version_file} ignored')
+                    continue
+                model_shorthand = _model_shorthand.get(model_dir.stem, model_dir.stem)
                 if (
                     model_dir == "p300"
                     and int(version_list[0]) == 1
                     and int(version_list[1]) == 0
                 ):
                     # Well apparently, we decided to switch the shorthand of the p300 depending
                     # on whether it's a "V1" model or not...so...here is the lovely workaround.
-                    model_shorthand = model_dir
-                serial_shorthand = f"{model_shorthand.upper()}{_channel_shorthand[channel_dir]}V{version_list[0]}{version_list[1]}"
+                    model_shorthand = model_dir.stem
+                serial_shorthand = f"{model_shorthand.upper()}{_channel_shorthand[channel_dir.stem]}V{version_list[0]}{version_list[1]}"
                 _lookup_table[serial_shorthand] = built_model
     return _lookup_table