From e6c5950af0337f6d991f98d8b93b24825334e270 Mon Sep 17 00:00:00 2001
From: Georg Brandl <georg@python.org>
Date: Sun, 1 Aug 2010 15:30:56 +0000
Subject: [PATCH] #5551: symbolic links never can be mount points.  Fixes the
 fix for #1713.

---
 Lib/posixpath.py | 3 +++
 Misc/NEWS        | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/Lib/posixpath.py b/Lib/posixpath.py
index 667f5c52de2..e9f4251846c 100644
--- a/Lib/posixpath.py
+++ b/Lib/posixpath.py
@@ -200,6 +200,9 @@ def samestat(s1, s2):
 
 def ismount(path):
     """Test whether a path is a mount point"""
+    if islink(path):
+        # A symlink can never be a mount point
+        return False
     try:
         s1 = os.lstat(path)
         if isinstance(path, bytes):
diff --git a/Misc/NEWS b/Misc/NEWS
index 0fa78458f52..94bf2b9de07 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -29,6 +29,9 @@ Extensions
 Library
 -------
 
+- Issue #1713: Fix os.path.ismount(), which returned true for symbolic links
+  across devices.
+
 - Issue #8826: Properly load old-style "expires" attribute in http.cookies.
 
 - Issue #1690103: Fix initial namespace for code run with trace.main().