skip directories with perm error when building autoimport index

rope/contrib/autoimport/sqlite.py

@@ -546,13 +546,23 @@ def filter_folders(folder: Path) -> bool:
         folder_paths = filter(filter_folders, folder_paths)  # type:ignore
         return list(OrderedDict.fromkeys(folder_paths))
 
+    def _safe_iterdir(self, folder: Path):
+        dirs = folder.iterdir()
+        while True:
+            try:
+                yield next(dirs)
+            except PermissionError:
+                pass
+            except StopIteration:
+                break
+
     def _get_available_packages(self) -> List[Package]:
         packages: List[Package] = [
             Package(module, Source.BUILTIN, None, PackageType.BUILTIN)
             for module in sys.builtin_module_names
         ]
         for folder in self._get_python_folders():
-            for package in folder.iterdir():
+            for package in self._safe_iterdir(folder):
                 package_tuple = get_package_tuple(package, self.project)
                 if package_tuple is None:
                     continue
@@ -602,7 +612,7 @@ def _find_package_path(self, target_name: str) -> Optional[Package]:
         if target_name in sys.builtin_module_names:
             return Package(target_name, Source.BUILTIN, None, PackageType.BUILTIN)
         for folder in self._get_python_folders():
-            for package in folder.iterdir():
+            for package in self._safe_iterdir(folder):
                 package_tuple = get_package_tuple(package, self.project)
                 if package_tuple is None:
                     continue

ropetest/contrib/autoimporttest.py

@@ -142,6 +142,22 @@ def test_generate_full_cache(self):
         for table in self.importer._dump_all():
             self.assertTrue(len(table) > 0)
 
+    def test_generate_full_cache(self):
+        """The single thread test takes much longer than the multithread test but is easier to debug"""
+        single_thread = False
+        self.importer.generate_modules_cache(single_thread=single_thread)
+        """
+        Create a temporary directory and set permissions to 000
+        """
+        import tempfile, sys
+        with tempfile.TemporaryDirectory() as dir:
+            import os
+            os.chmod(dir, 0)
+            sys.path.append(dir)
+            self.importer.generate_modules_cache(single_thread=single_thread)
+        self.assertIn(("from typing import Dict", "Dict"), self.importer.search("Dict"))
+        self.assertTrue(len(self.importer._dump_all()) > 0)
+
 
 class AutoImportObservingTest(unittest.TestCase):
     def setUp(self):