Issue #8485: PyUnicode_FSConverter() doesn't accept bytearray object anymore,

you have to convert your bytearray filenames to bytes

Doc/whatsnew/3.2.rst

@@ -151,4 +151,6 @@ Porting to Python 3.2
 This section lists previously described changes and other bugfixes
 that may require changes to your code:
 
+* bytearray objects cannot be used anymore as filenames: convert them to bytes
+
 * Stub

Include/unicodeobject.h

@@ -1238,8 +1238,8 @@ PyAPI_FUNC(int) PyUnicode_EncodeDecimal(
 /* --- File system encoding ---------------------------------------------- */
 
 /* ParseTuple converter which converts a Unicode object into the file
-   system encoding, using the PEP 383 error handler; bytes objects are
-   output as-is. */
+   system encoding as a bytes object, using the PEP 383 error handler; bytes
+   objects are output as-is. */
 
 PyAPI_FUNC(int) PyUnicode_FSConverter(PyObject*, void*);
 

Lib/test/test_bytes.py

@@ -815,13 +815,6 @@ class ByteArrayTest(BaseBytesTest):
         self.assertRaises(BufferError, delslice)
         self.assertEquals(b, orig)
 
-    def test_empty_bytearray(self):
-        # Issue #7561: operations on empty bytearrays could crash in many
-        # situations, due to a fragile implementation of the
-        # PyByteArray_AS_STRING() C macro.
-        self.assertRaises(ValueError, int, bytearray(b''))
-        self.assertRaises((ValueError, OSError), os.mkdir, bytearray(b''))
-
 
 class AssortedBytesTest(unittest.TestCase):
     #

Lib/test/test_os.py

@@ -607,14 +607,6 @@ class ExecTests(unittest.TestCase):
     def test_execvpe_with_bad_arglist(self):
         self.assertRaises(ValueError, os.execvpe, 'notepad', [], None)
 
-class ArgTests(unittest.TestCase):
-    def test_bytearray(self):
-        # Issue #7561: posix module didn't release bytearray exports properly.
-        b = bytearray(os.sep.encode('ascii'))
-        self.assertRaises(OSError, os.mkdir, b)
-        # Check object is still resizable.
-        b[:] = b''
-
 class Win32ErrorTests(unittest.TestCase):
     def test_rename(self):
         self.assertRaises(WindowsError, os.rename, support.TESTFN, support.TESTFN+".bak")
@@ -872,7 +864,6 @@ class Win32KillTests(unittest.TestCase):
 
 def test_main():
     support.run_unittest(
-        ArgTests,
         FileTests,
         StatAttributeTests,
         EnvironTests,

Misc/NEWS

@@ -12,6 +12,9 @@ What's New in Python 3.2 Alpha 1?
 Core and Builtins
 -----------------
 
+- Issue #8485: PyUnicode_FSConverter() doesn't accept bytearray object anymore,
+  you have to convert your bytearray filenames to bytes
+
 - Issue #7332: Remove the 16KB stack-based buffer in
   PyMarshal_ReadLastObjectFromFile, which doesn't bring any noticeable
   benefit compared to the dynamic memory allocation fallback.  Patch by

Modules/_posixsubprocess.c

@@ -271,10 +271,7 @@ subprocess_fork_exec(PyObject* self, PyObject *args)
     if (cwd_obj != Py_None) {
         if (PyUnicode_FSConverter(cwd_obj, &cwd_obj2) == 0)
             goto cleanup;
-        if (PyBytes_Check(cwd_obj2))
-            cwd = PyBytes_AS_STRING(cwd_obj2);
-        else
-            cwd = PyByteArray_AS_STRING(cwd_obj2);
+        cwd = PyBytes_AsString(cwd_obj2);
     } else {
         cwd = NULL;
         cwd_obj2 = NULL;

Objects/unicodeobject.c

@@ -1624,7 +1624,7 @@ PyUnicode_FSConverter(PyObject* arg, void* addr)
         Py_DECREF(*(PyObject**)addr);
         return 1;
     }
-    if (PyBytes_Check(arg) || PyByteArray_Check(arg)) {
+    if (PyBytes_Check(arg)) {
         output = arg;
         Py_INCREF(output);
     }