Fix compatibilithy with Python 2.4.

NEWS

@@ -5,6 +5,8 @@
   * Fix use of alternates in ``DiskObjectStore``.{__contains__,__iter__}.
     (Dmitriy)
 
+  * Fix compatibility with Python 2.4. (David Carr)
+
 0.8.6	2012-11-09
 
  API CHANGES

dulwich/repo.py

@@ -1243,8 +1243,11 @@ class Repo(BaseRepo):
             self._controldir = root
         elif (os.path.isfile(os.path.join(root, ".git"))):
             import re
-            with open(os.path.join(root, ".git"), 'r') as f:
+            f = open(os.path.join(root, ".git"), 'r')
+            try:
                 _, path = re.match('(gitdir: )(.+$)', f.read()).groups()
+            finally:
+                f.close()
             self.bare = False
             self._controldir = os.path.join(root, path)
         else: