1 files changed, 14 insertions, 15 deletions

diff --git a/gitdb/db/ref.py b/gitdb/db/ref.py
index 0a28b9e..d989126 100644
--- a/gitdb/db/ref.py
+++ b/gitdb/db/ref.py
@@ -2,25 +2,24 @@
 #
 # This module is part of GitDB and is released under
 # the New BSD License: http://www.opensource.org/licenses/bsd-license.php
-from base import (
-                    CompoundDB,
-                )
+from gitdb.db.base import (
+    CompoundDB,
+)
 
-import os
 __all__ = ('ReferenceDB', )
 
 class ReferenceDB(CompoundDB):
     """A database consisting of database referred to in a file"""
-    
+
     # Configuration
     # Specifies the object database to use for the paths found in the alternates
     # file. If None, it defaults to the GitDB
     ObjectDBCls = None
-    
+
     def __init__(self, ref_file):
         super(ReferenceDB, self).__init__()
         self._ref_file = ref_file
-        
+
     def _set_cache_(self, attr):
         if attr == '_dbs':
             self._dbs = list()
@@ -28,15 +27,15 @@ class ReferenceDB(CompoundDB):
         else:
             super(ReferenceDB, self)._set_cache_(attr)
         # END handle attrs
-        
+
     def _update_dbs_from_ref_file(self):
         dbcls = self.ObjectDBCls
         if dbcls is None:
             # late import
-            from git import GitDB
+            from gitdb.db.git import GitDB
             dbcls = GitDB
         # END get db type
-        
+
         # try to get as many as possible, don't fail if some are unavailable
         ref_paths = list()
         try:
@@ -44,10 +43,10 @@ class ReferenceDB(CompoundDB):
         except (OSError, IOError):
             pass
         # END handle alternates
-        
+
         ref_paths_set = set(ref_paths)
         cur_ref_paths_set = set(db.root_path() for db in self._dbs)
-        
+
         # remove existing
         for path in (cur_ref_paths_set - ref_paths_set):
             for i, db in enumerate(self._dbs[:]):
@@ -56,7 +55,7 @@ class ReferenceDB(CompoundDB):
                     continue
                 # END del matching db
         # END for each path to remove
-        
+
         # add new
         # sort them to maintain order
         added_paths = sorted(ref_paths_set - cur_ref_paths_set, key=lambda p: ref_paths.index(p))
@@ -68,11 +67,11 @@ class ReferenceDB(CompoundDB):
                     db.databases()
                 # END verification
                 self._dbs.append(db)
-            except Exception as e:
+            except Exception:
                 # ignore invalid paths or issues
                 pass
         # END for each path to add
-        
+
     def update_cache(self, force=False):
         # re-read alternates and update databases
         self._update_dbs_from_ref_file()