3 files changed, 24 insertions, 7 deletions
diff --git a/libbe/storage/__init__.py b/libbe/storage/__init__.py
index 104b1e1..e99f799 100644
--- a/libbe/storage/__init__.py
+++ b/libbe/storage/__init__.py
@@ -3,6 +3,7 @@
 import base
 
 ConnectionError = base.ConnectionError
+InvalidStorageVersion = base.InvalidStorageVersion
 InvalidID = base.InvalidID
 InvalidRevision = base.InvalidRevision
 InvalidDirectory = base.InvalidDirectory
@@ -30,7 +31,7 @@ def get_storage(location):
     s.repo = location
     return s
 
-__all__ = [ConnectionError, InvalidID, InvalidRevision,
-           InvalidDirectory, NotWriteable, NotReadable,
+__all__ = [ConnectionError, InvalidStorageVersion, InvalidID,
+           InvalidRevision, InvalidDirectory, NotWriteable, NotReadable,
            EmptyCommit, STORAGE_VERSIONS, STORAGE_VERSION,
            get_storage]
diff --git a/libbe/storage/base.py b/libbe/storage/base.py
index f32353f..b43f765 100644
--- a/libbe/storage/base.py
+++ b/libbe/storage/base.py
@@ -26,6 +26,16 @@ if TESTING == True:
 class ConnectionError (Exception):
     pass
 
+class InvalidStorageVersion(ConnectionError):
+    def __init__(self, active_version, expected_version=None):
+        if expected_version == None:
+            expected_version = libbe.storage.STORAGE_VERSION
+        msg = 'Storage in "%s" not the expected "%s"' \
+            % (active_version, expected_version)
+        Exception.__init__(self, msg)
+        self.active_version = active_version
+        self.expected_version = expected_version
+
 class InvalidID (KeyError):
     pass
 
@@ -50,6 +60,7 @@ class EmptyCommit(Exception):
     def __init__(self):
         Exception.__init__(self, 'No changes to commit')
 
+
 class Entry (Tree):
     def __init__(self, id, value=None, parent=None, directory=False,
                  children=None):
@@ -134,7 +145,7 @@ class Storage (object):
         """Return a version string for this backend."""
         return '0'
 
-    def storage_version(self):
+    def storage_version(self, revision=None):
         """Return the storage format for this backend."""
         return libbe.storage.STORAGE_VERSION
 
diff --git a/libbe/storage/vcs/base.py b/libbe/storage/vcs/base.py
index 1df08cf..e96b466 100644
--- a/libbe/storage/vcs/base.py
+++ b/libbe/storage/vcs/base.py
@@ -32,6 +32,7 @@ import re
 import shutil
 import sys
 import tempfile
+import types
 
 import libbe
 import libbe.storage
@@ -885,15 +886,19 @@ os.listdir(self.get_path("bugs")):
         if version != libbe.storage.STORAGE_VERSION:
             upgrade.upgrade(self.repo, version)
 
-    def storage_version(self, path=None):
+    def storage_version(self, revision=None, path=None):
         """
         Requires disk access.
         """
         if path == None:
             path = os.path.join(self.repo, '.be', 'version')
-        return libbe.util.encoding.get_file_contents(
-            path, decode=True).rstrip('\n')
-
+        if revision == None: # don't require connection
+            return libbe.util.encoding.get_file_contents(
+                path, decode=True).rstrip('\n')
+        contents = self._vcs_get_file_contents(path, revision=revision)
+        if type(contents) != types.UnicodeType:
+            contents = unicode(contents, self.encoding)
+        return contents.strip()
 
 
 if libbe.TESTING == True: