Error check stack config

Former-commit-id: d454a4ffc1

app/util.py

@@ -1,4 +1,4 @@
-# Copyright © 2022 Cerc
+# Copyright © 2022, 2023 Cerc
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as published by
@@ -13,6 +13,12 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http:#www.gnu.org/licenses/>.
 
+import os.path
+import sys
+import yaml
+from pathlib import Path
+
+
 def include_exclude_check(s, include, exclude):
     if include is None and exclude is None:
         return True
@@ -22,3 +28,23 @@ def include_exclude_check(s, include, exclude):
     if exclude is not None:
         exclude_list = exclude.split(",")
         return s not in exclude_list
+
+
+def get_parsed_stack_config(stack):
+    # In order to be compatible with Python 3.8 we need to use this hack to get the path:
+    # See: https://stackoverflow.com/questions/25389095/python-get-path-of-root-project-structure
+    stack_file_path = Path(__file__).absolute().parent.joinpath("data", "stacks", stack, "stack.yml")
+    try:
+        with stack_file_path:
+            stack_config = yaml.safe_load(open(stack_file_path, "r"))
+            return stack_config
+    except FileNotFoundError as error:
+        # We try here to generate a useful diagnostic error
+        # First check if the stack directory is present
+        stack_directory = stack_file_path.parent
+        if os.path.exists(stack_directory):
+            print(f"Error: stack.yml file is missing from stack: {stack}")
+        else:
+            print(f"Error: stack: {stack} does not exist")
+        print(f"Exiting, error: {error}")
+        sys.exit(1)