Improve error handling for missing Provider configurations

Throw a ProviderException when a provider configuration is missing
but the Provider is linked to an excisting Stack.

Changelog.md

@@ -1,3 +1,7 @@
+Unreleased
+-------------------------
+* [Enhancement] Add better error handling for missing Provider configuration.
+
 Version 7.9.1 (2024-02-14)
 -------------------------
 * [Bug fix] Don't allow accessing a fullscreen lab directly from a URL,

hastexo/provider.py

@@ -66,6 +66,9 @@ def init(name):
                 return OpenstackProvider(name, config, sleep_seconds)
             elif provider_type == "gcloud":
                 return GcloudProvider(name, config, sleep_seconds)
+        else:
+            raise ProviderException(
+                f"No configuration provided for provider {name}")
 
     def __init__(self, name, config, sleep):
         self.name = name

tests/unit/test_provider.py

@@ -169,6 +169,12 @@ def test_init(self):
         self.assertNotEqual(provider.heat_c, None)
         self.assertNotEqual(provider.nova_c, None)
 
+    def test_init_missing_configuration(self):
+        self.settings["providers"].pop(self.provider_name)
+
+        with self.assertRaises(ProviderException):
+            Provider.init(self.provider_name)
+
     def test_generate_ssh_keys(self):
         provider = Provider.init(self.provider_name)