Check to make sure dulwich is available and print error

1 files changed, 2 insertions, 0 deletions

diff --git a/scripts/builder/repository.py b/scripts/builder/repository.py
index 89db9a5..f3f7d6f 100644
--- a/scripts/builder/repository.py
+++ b/scripts/builder/repository.py
@@ -1,75 +1,77 @@
 #!/usr/bin/env python
 # -*- coding: UTF-8 -*-
 
 
 def repositoryWithPath (path):
         try:
                 from dulwich.repo import Repo
 
                 repo = Repo(path)
                 result = GitRepository(repo, path)
+        except ImportError:
+                print "Failed to import dulwich, please install http://www.samba.org/~jelmer/dulwich/"
         except:
                 from mercurial import ui, hg
 
                 repo = hg.repository(ui.ui(), path)
                 result = HgRepository(repo, path)
 
         return result
 
 
 #===================================================================
 
 
 class Repository(object):
 
         def __init__ (self, repository, path):
                 self.repository = repository
                 self.path = path
 
 
         def revision (self):
                 raise NotImplementedError()
         
 
         def areTherePendingChanges (self):
                 raise NotImplementedError()
 
 
         def version (self):
                 result = self.revision()
                 if self.areTherePendingChanges():
                         result = '>>> ' + result + ' <<<'
 
                 # print "VERSION: " + result
                 return result
 
 
 #===================================================================
 
 
 class GitRepository(Repository):
 
         def revision (self):
                 return repository.refs['HEAD']
         
 
         def areTherePendingChanges (self):
                 return repository.is_dirty()
 
 
 #===================================================================
 
 
 class HgRepository(Repository):
                 #http://mercurial.selenic.com/wiki/MercurialApi
 
         def revision (self):
                 return 'hg:' + str(self.repository['tip'])
         
 
         def areTherePendingChanges (self):
                 # TODO: FIXME: repository.status() does not report 'unknown(?)' files. :(
                 return not all(map(lambda fileList: len(fileList) == 0, self.repository.status()))
 
 
 #===================================================================