Index: trunk/packages/invirt-dev/python/invirt/builder.py
===================================================================
--- trunk/packages/invirt-dev/python/invirt/builder.py	(revision 3040)
+++ trunk/packages/invirt-dev/python/invirt/builder.py	(revision 3041)
@@ -147,5 +147,6 @@
         # Almost by definition, A is a fast-forward of B if B..A is
         # empty
-        if not c.captureOutput(['git', 'rev-list', '%s..%s' % (commit, branch)]):
+        if not c.captureOutput(['git', 'rev-list', '%s..%s' % (commit, branch)],
+                               cwd=package_repo):
             raise InvalidBuild('New commit %s of %s is not a fast-forward of'
                                'commit currently in pocket %s' %