From c2d01423e02d9721f897812cf6a93e64c7d75c15 Mon Sep 17 00:00:00 2001
From: Serhiy Storchaka <storchaka@gmail.com>
Date: Sat, 18 Jan 2014 16:14:10 +0200
Subject: Issue #20243: TarFile no longer raise ReadError when opened in write
 mode.

---
 Lib/test/test_tarfile.py | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'Lib/test/test_tarfile.py')

diff --git a/Lib/test/test_tarfile.py b/Lib/test/test_tarfile.py
index ceaa3aa494..f22b908797 100644
--- a/Lib/test/test_tarfile.py
+++ b/Lib/test/test_tarfile.py
@@ -1155,6 +1155,22 @@ class WriteTest(WriteTestBase, unittest.TestCase):
         finally:
             os.chdir(cwd)
 
+    def test_open_nonwritable_fileobj(self):
+        for exctype in OSError, EOFError, RuntimeError:
+            class BadFile(io.BytesIO):
+                first = True
+                def write(self, data):
+                    if self.first:
+                        self.first = False
+                        raise exctype
+
+            f = BadFile()
+            with self.assertRaises(exctype):
+                tar = tarfile.open(tmpname, self.mode, fileobj=f,
+                                   format=tarfile.PAX_FORMAT,
+                                   pax_headers={'non': 'empty'})
+            self.assertFalse(f.closed)
+
 class GzipWriteTest(GzipTest, WriteTest):
     pass
 
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