2 files changed, 5 insertions, 0 deletions
diff --git a/libbe/storage/vcs/base.py b/libbe/storage/vcs/base.py
index 7d17b56..fffabf8 100644
--- a/libbe/storage/vcs/base.py
+++ b/libbe/storage/vcs/base.py
@@ -36,6 +36,7 @@ import tempfile
 import libbe
 import libbe.storage.base
 import libbe.util.encoding
+from libbe.storage.base import EmptyCommit, InvalidRevision
 from libbe.util.utility import Dir, search_parent_directories
 from libbe.util.subproc import CommandError, invoke
 from libbe.util.plugin import import_by_name
diff --git a/libbe/storage/vcs/hg.py b/libbe/storage/vcs/hg.py
index f1a7eef..260f0c4 100644
--- a/libbe/storage/vcs/hg.py
+++ b/libbe/storage/vcs/hg.py
@@ -100,6 +100,10 @@ class Hg(base.VCS):
         return self._vcs_revision_id(-1)
 
     def _vcs_revision_id(self, index, style='id'):
+        try:
+            index = str(int(index))
+        except ValueError:
+            return None
         args = ['identify', '--rev', str(int(index)), '--%s' % style]
         kwargs = {'expect': (0,255)}
         status,output,error = self._u_invoke_client(*args, **kwargs)