From b11498e8aa458385660da6d3b6db646626a6c4a1 Mon Sep 17 00:00:00 2001
From: Bastian Kleineidam <bastian.kleineidam@web.de>
Date: Fri, 22 Feb 2013 18:33:38 +0100
Subject: [PATCH] Add chdir utility function.

---
 patoolib/util.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/patoolib/util.py b/patoolib/util.py
index 1601479..374c95e 100644
--- a/patoolib/util.py
+++ b/patoolib/util.py
@@ -492,4 +492,16 @@ def link_or_copy(src, dst, verbose=False):
         shutil.copy(src, dst)
 
 
+def chdir(directory):
+    """Remember and return current directory before calling os.chdir().
+    If the current directory could not be determined, return None.
+    """
+    try:
+        olddir = os.getcwd()
+    except OSError:
+        olddir = None
+    os.chdir(directory)
+    return olddir
+
+
 init_mimedb()