From 3f0ef20269aef0408a0a325bf5300a1ca676aa52 Mon Sep 17 00:00:00 2001
From: Georg Brandl <georg@python.org>
Date: Sun, 5 Apr 2009 14:48:49 +0000
Subject: [PATCH] #5471: fix expanduser() for $HOME set to "/".

---
 Lib/posixpath.py           | 2 +-
 Lib/test/test_posixpath.py | 5 +++++
 Misc/NEWS                  | 2 ++
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/Lib/posixpath.py b/Lib/posixpath.py
index 6eb45fd0ead..0ec430ddf7c 100644
--- a/Lib/posixpath.py
+++ b/Lib/posixpath.py
@@ -262,7 +262,7 @@ def expanduser(path):
         except KeyError:
             return path
         userhome = pwent.pw_dir
-    userhome = userhome.rstrip('/')
+    userhome = userhome.rstrip('/') or userhome
     return userhome + path[i:]
 
 
diff --git a/Lib/test/test_posixpath.py b/Lib/test/test_posixpath.py
index 46ac0672631..e6f750a0c2e 100644
--- a/Lib/test/test_posixpath.py
+++ b/Lib/test/test_posixpath.py
@@ -345,6 +345,11 @@ class PosixPathTest(unittest.TestCase):
             self.assert_(isinstance(posixpath.expanduser("~root/"), basestring))
             self.assert_(isinstance(posixpath.expanduser("~foo/"), basestring))
 
+            orig_home = os.environ['HOME']
+            os.environ['HOME'] = '/'
+            self.assertEqual(posixpath.expanduser("~"), "/")
+            os.environ['HOME'] = orig_home
+
         self.assertRaises(TypeError, posixpath.expanduser)
 
     def test_expandvars(self):
diff --git a/Misc/NEWS b/Misc/NEWS
index bfcd9fa9114..fd35fad3120 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -212,6 +212,8 @@ Core and Builtins
 Library
 -------
 
+- Issue 5471: Fix os.path.expanduser() for $HOME set to '/'.
+
 - Issue 1326077: fix the formatting of SyntaxErrors by the traceback module.
 
 - Issue 1726172: fix IndexError in the case of and empty response in ftplib.