From: Petri Lehtinen <petri@digip.org>
Date: Fri, 29 Jun 2012 12:09:12 +0000 (+0300)
Subject: #5346: Preserve permissions of mbox, MMDF and Babyl mailbox files on flush()
X-Git-Tag: v2.7.4rc1~734
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=d07de404907b7eab1796b9065ff6bcc3de14c4fc;p=python

#5346: Preserve permissions of mbox, MMDF and Babyl mailbox files on flush()
---

diff --git a/Lib/mailbox.py b/Lib/mailbox.py
index fc154fa12a..61683674ff 100644
--- a/Lib/mailbox.py
+++ b/Lib/mailbox.py
@@ -665,6 +665,9 @@ class _singlefileMailbox(Mailbox):
         _sync_close(new_file)
         # self._file is about to get replaced, so no need to sync.
         self._file.close()
+        # Make sure the new file's mode is the same as the old file's
+        mode = os.stat(self._path).st_mode
+        os.chmod(new_file.name, mode)
         try:
             os.rename(new_file.name, self._path)
         except OSError, e:
diff --git a/Lib/test/test_mailbox.py b/Lib/test/test_mailbox.py
index a8c692b981..d479bf85f1 100644
--- a/Lib/test/test_mailbox.py
+++ b/Lib/test/test_mailbox.py
@@ -848,6 +848,23 @@ class _TestSingleFile(TestMailbox):
         self._box = self._factory(self._path)
         self.assertEqual(len(self._box), 1)
 
+    def test_permissions_after_flush(self):
+        # See issue #5346
+
+        # Make the mailbox world writable. It's unlikely that the new
+        # mailbox file would have these permissions after flush(),
+        # because umask usually prevents it.
+        mode = os.stat(self._path).st_mode | 0o666
+        os.chmod(self._path, mode)
+
+        self._box.add(self._template % 0)
+        i = self._box.add(self._template % 1)
+        # Need to remove one message to make flush() create a new file
+        self._box.remove(i)
+        self._box.flush()
+
+        self.assertEqual(os.stat(self._path).st_mode, mode)
+
 
 class _TestMboxMMDF(_TestSingleFile):
 
diff --git a/Misc/NEWS b/Misc/NEWS
index 09ea7e3b9d..9839903dfd 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -75,6 +75,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #5346: Preserve permissions of mbox, MMDF and Babyl mailbox
+  files on flush().
+
 - Issue #15219: Fix a reference leak when hashlib.new() is called with
   invalid parameters.