Re-init plugin loader after collections installation (ansible#411)

src/ansible_compat/runtime.py

@@ -318,7 +318,7 @@ def load_collections(self) -> None:
                         path=path,
                     )
 
-    def _ensure_module_available(self) -> None:
+    def _ensure_module_available(self, reload = False) -> None:
         """Assure that Ansible Python module is installed and matching CLI version."""
         ansible_release_module = None
         with contextlib.suppress(ModuleNotFoundError, ImportError):
@@ -337,12 +337,14 @@ def _ensure_module_available(self) -> None:
 
         # For ansible 2.15+ we need to initialize the plugin loader
         # https://github.com/ansible/ansible-lint/issues/2945
-        if not Runtime.initialized:
+        if not Runtime.initialized or reload:
             col_path = [f"{self.cache_dir}/collections"]
             if self.version >= Version("2.15.0.dev0"):
                 # pylint: disable=import-outside-toplevel,no-name-in-module
+                from ansible.utils.collection_loader._collection_finder import _AnsibleCollectionFinder
                 from ansible.plugins.loader import init_plugin_loader
 
+                _AnsibleCollectionFinder._remove()
                 init_plugin_loader(col_path)
             else:
                 # noinspection PyProtectedMember
@@ -622,6 +624,7 @@ def install_requirements(  # noqa: C901
                 if result.returncode != 0:
                     _logger.error(result.stderr)
                     raise AnsibleCommandError(result)
+        self._ensure_module_available(reload=True)
 
     # pylint: disable=too-many-locals
     def prepare_environment(  # noqa: C901