Add option to set birdnet app data manually

docs/setup.rst

@@ -281,6 +281,14 @@ All BirdNET data (models, benchmarks) is stored in the application-data director
 - **macOS:** ``~/Library/Application Support/birdnet``
 - **Windows:** ``%APPDATA%/birdnet``
 
+The default location can be overridden by setting the ``BIRDNET_APP_DATA`` environment variable to any absolute path before the ``birdnet`` package is imported.::
+
+  # Windows pre-execution script
+  set BIRDNET_APP_DATA=C:\Program Files\BirdNET-Analyzer\birdnet-data
+
+  # Linux / macOS pre-execution script
+  export BIRDNET_APP_DATA=/opt/birdnet-analyzer/birdnet-data
+
 Why is Python 3.10 not supported?
 ^^^^
 

src/birdnet/globals.py

@@ -145,6 +145,8 @@
 
 PKG_NAME = "birdnet"
 
+ENV_VAR_APP_DATA = "BIRDNET_APP_DATA"
+
 # flag for "can be written to" = free
 WRITABLE_FLAG = np.uint8(0)
 

src/birdnet/utils/local_data.py

@@ -4,6 +4,7 @@
 
 from birdnet.globals import (
   ACOUSTIC_MODEL_VERSIONS,
+  ENV_VAR_APP_DATA,
   GEO_MODEL_VERSIONS,
   MODEL_BACKEND_PB,
   MODEL_BACKEND_TF,
@@ -38,6 +39,9 @@ def get_app_data_path() -> Path:
 
 
 def get_birdnet_app_data_folder() -> Path:
+  override = os.getenv(ENV_VAR_APP_DATA)
+  if override is not None:
+    return Path(override)
   app_data = get_app_data_path()
   result = app_data / PKG_NAME
   return result