Fix compatibility issues with older python versions

Signed-off-by: Marcus Burghardt <[email protected]>

ssg/variables.py

@@ -1,8 +1,9 @@
 from __future__ import absolute_import
 from __future__ import print_function
 
-import os
 import glob
+import os
+import sys
 import yaml
 
 from collections import defaultdict
@@ -15,11 +16,17 @@
 )
 from .yaml import open_and_macro_expand
 
+
+if sys.version_info >= (3, 9):
+    list_type = list  # Python 3.9+ supports built-in generics
+else:
+    from typing import List as list_type  # Fallback for older versions
+
 # Cache variable files to avoid multiple reads
 _var_files_cache = {}
 
 
-def get_variable_files_in_folder(content_dir: str, subfolder: str) -> list[str]:
+def get_variable_files_in_folder(content_dir: str, subfolder: str) -> list_type[str]:
     """
     Retrieve a list of variable files within a specified folder in the project.
 
@@ -36,7 +43,7 @@ def get_variable_files_in_folder(content_dir: str, subfolder: str) -> list[str]:
     return glob.glob(pattern, recursive=True)
 
 
-def get_variable_files(content_dir: str) -> list[str]:
+def get_variable_files(content_dir: str) -> list_type[str]:
     """
     Retrieves all variable files from the specified content root directory.
 
@@ -296,7 +303,7 @@ def _load_controls_manager(controls_dir: str, product_yaml: dict) -> object:
     return control_mgr
 
 
-def _get_profiles_from_products(content_dir: str, products: list) -> list:
+def _get_profiles_from_products(content_dir: str, products: list) -> list_type:
     """
     Retrieves profiles with respective variables from the given products.