Check and uninstall extensions before installing it

microsoft/testsuites/vm_extensions/runtime_extensions/custom_script.py

@@ -21,6 +21,7 @@
 from lisa.sut_orchestrator import AZURE
 from lisa.sut_orchestrator.azure.features import AzureExtension
 from lisa.sut_orchestrator.azure.tools import Waagent
+from lisa.util import LisaException
 from microsoft.testsuites.vm_extensions.runtime_extensions.common import (
     check_waagent_version_supported,
     execute_command,
@@ -38,10 +39,22 @@ def _create_and_verify_extension_run(
     assert_exception: Any = None,
 ) -> None:
     extension = node.features[AzureExtension]
+    extension_name = "CustomScript"
+    try:
+        # Delete VM Extension if already present
+        extension.delete(extension_name)
+    except HttpResponseError as identifier:
+        if any(s in str(identifier) for s in ["was not found"]):
+            node.log.info(f"{extension_name} is not installed")
+        else:
+            raise LisaException(
+                f"unexpected exception happened {identifier} during delete"
+                f" extension {extension_name}"
+            ) from identifier
 
     def enable_extension() -> Any:
         result = extension.create_or_update(
-            name="CustomScript",
+            name=extension_name,
             publisher="Microsoft.Azure.Extensions",
             type_="CustomScript",
             type_handler_version="2.1",