From 1ae65be0f7e621002e2e29921e0252c1b57a170c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20G=C3=B3rny?= <mgorny@gentoo.org>
Date: Sun, 20 Jun 2021 17:54:52 +0200
Subject: [PATCH] Implement PEP451 semantics for DynamicImporter

Make DynamicImporter PEP451-compliant in order to silence ImportWarnings
in Python 3.10.  This is mostly based on six._SixMetaPathImporter.

Fixes #476
---
 gi/importer.py | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/gi/importer.py b/gi/importer.py
index 32967974..006cf464 100644
--- a/gi/importer.py
+++ b/gi/importer.py
@@ -24,6 +24,7 @@
 import sys
 import warnings
 import importlib
+import importlib.util
 from contextlib import contextmanager
 
 import gi
@@ -103,6 +104,7 @@ def get_import_stacklevel(import_hook):
 class DynamicImporter(object):
 
     # Note: see PEP302 for the Importer Protocol implemented below.
+    # PEP451 for A ModuleSpec Type for the Import System.
 
     def __init__(self, path):
         self.path = path
@@ -117,6 +119,16 @@ class DynamicImporter(object):
 
         return self
 
+    def find_spec(self, fullname, path, target=None):
+        if not fullname.startswith(self.path):
+            return None
+
+        path, namespace = fullname.rsplit('.', 1)
+        if path != self.path:
+            return None
+
+        return importlib.util.spec_from_loader(fullname, self)
+
     def load_module(self, fullname):
         if fullname in sys.modules:
             return sys.modules[fullname]
@@ -149,3 +161,9 @@ class DynamicImporter(object):
         sys.modules[fullname] = dynamic_module
 
         return dynamic_module
+
+    def create_module(self, spec):
+        return self.load_module(spec.name)
+
+    def exec_module(self, module):
+        pass
-- 
2.32.0