Issue #23696: Chain ZipImportError to the OSError

Lib/test/test_zipimport.py

@@ -450,7 +450,10 @@ class BadFileZipImportTestCase(unittest.TestCase):
         fd = os.open(TESTMOD, os.O_CREAT, 000)
         try:
             os.close(fd)
-            self.assertZipFailure(TESTMOD)
+
+            with self.assertRaises(zipimport.ZipImportError) as cm:
+                zipimport.zipimporter(TESTMOD)
+            self.assertIsInstance(cm.exception.__context__, PermissionError)
         finally:
             # If we leave "the read-only bit" set on Windows, nothing can
             # delete TESTMOD, and later tests suffer bogus failures.

Modules/zipimport.c

@@ -875,8 +875,12 @@ read_directory(PyObject *archive)
 
     fp = _Py_fopen_obj(archive, "rb");
     if (fp == NULL) {
-        if (PyErr_ExceptionMatches(PyExc_OSError))
+        if (PyErr_ExceptionMatches(PyExc_OSError)) {
+            PyObject *exc, *val, *tb;
+            PyErr_Fetch(&exc, &val, &tb);
             PyErr_Format(ZipImportError, "can't open Zip file: %R", archive);
+            _PyErr_ChainExceptions(exc, val, tb);
+        }
         return NULL;
     }