Fix for SF bug #1029475 : reload() doesn't work with PEP 302 loaders.

Lib/test/test_importhooks.py

@@ -12,7 +12,13 @@ def get_file():
     return __file__
 """
 
+reload_src = test_src+"""\
+reloaded = True
+"""
+
 test_co = compile(test_src, "<???>", "exec")
+reload_co = compile(reload_src, "<???>", "exec")
+
 test_path = "!!!_test_!!!"
 
 
@@ -32,6 +38,7 @@ class TestImporter:
         "hooktestpackage": (True, test_co),
         "hooktestpackage.sub": (True, test_co),
         "hooktestpackage.sub.subber": (False, test_co),
+        "reloadmodule": (False, test_co),
     }
 
     def __init__(self, path=test_path):
@@ -52,8 +59,7 @@ class TestImporter:
 
     def load_module(self, fullname):
         ispkg, code = self.modules[fullname]
-        mod = imp.new_module(fullname)
-        sys.modules[fullname] = mod
+        mod = sys.modules.setdefault(fullname,imp.new_module(fullname))
         mod.__file__ = "<%s>" % self.__class__.__name__
         mod.__loader__ = self
         if ispkg:
@@ -163,6 +169,14 @@ class ImportHooksTestCase(ImportHooksBaseTestCase):
             self.assertEqual(hooktestpackage.sub.__loader__, importer)
             self.assertEqual(hooktestpackage.sub.subber.__loader__, importer)
 
+        TestImporter.modules['reloadmodule'] = (False, test_co)
+        import reloadmodule
+        self.failIf(hasattr(reloadmodule,'reloaded'))
+
+        TestImporter.modules['reloadmodule'] = (False, reload_co)
+        reload(reloadmodule)
+        self.failUnless(hasattr(reloadmodule,'reloaded'))
+       
     def testMetaPath(self):
         i = MetaImporter()
         sys.meta_path.append(i)

Python/import.c

@@ -2252,7 +2252,7 @@ PyObject *
 PyImport_ReloadModule(PyObject *m)
 {
 	PyObject *modules = PyImport_GetModuleDict();
-	PyObject *path = NULL;
+	PyObject *path = NULL, *loader = NULL;
 	char *name, *subname;
 	char buf[MAXPATHLEN+1];
 	struct filedescr *fdp;
@@ -2295,11 +2295,17 @@ PyImport_ReloadModule(PyObject *m)
 			PyErr_Clear();
 	}
 	buf[0] = '\0';
-	fdp = find_module(name, subname, path, buf, MAXPATHLEN+1, &fp, NULL);
+	fdp = find_module(name, subname, path, buf, MAXPATHLEN+1, &fp, &loader);
 	Py_XDECREF(path);
-	if (fdp == NULL)
+
+	if (fdp == NULL) {
+		Py_XDECREF(loader);
 		return NULL;
-	newm = load_module(name, fp, buf, fdp->type, NULL);
+	}
+
+	newm = load_module(name, fp, buf, fdp->type, loader);
+	Py_XDECREF(loader);
+
 	if (fp)
 		fclose(fp);
 	if (newm == NULL) {