Add relative path support.

pending_manager.py

Index: pending_manager.py
diff --git a/pending_manager.py b/pending_manager.py
index 41e5afe0d30df1c573d0c55752d2e9675ac2d257..5dd586d6f71172242bbf423e325dd349dba30776 100644
--- a/pending_manager.py
+++ b/pending_manager.py
@@ -29,10 +29,6 @@ import model
 from verification import base
 
 
-def TODO(string):
-  logging.warning(string)
-
-
 def send_stack(e):
   breakpad.SendStack(e,
       ''.join(traceback.format_tb(sys.exc_info()[2])),
@@ -47,7 +43,7 @@ class PendingCommit(base.Verified):
       'issue', 'patchset', 'rietveld_server', 'description',
       'files',
       # Only a cache, these values can be regenerated.
-      'owner', 'reviewers', 'base_url', 'messages',
+      'owner', 'reviewers', 'base_url', 'messages', 'relpath',
       # Only used after a patch was committed. Keeping here for completeness.
       'revision',
   ]
@@ -64,6 +60,7 @@ class PendingCommit(base.Verified):
     self.description = description
     self.messages = messages
     self.revision = None
+    self.relpath = ''
     self.files = []
 
   def patch_url(self):
@@ -282,9 +279,15 @@ class PendingManager(object):
     """
     try:
       patches = self.rietveld.get_patch(pending.issue, pending.patchset)
+      if not patches:
+        raise base.DiscardPending(
+            pending, 'No diff was found for this patchset.')
+      if pending.relpath:
+        patches.set_relpath(pending.relpath)
       pending.files = [p.filename for p in patches]
       if not pending.files:
-        raise base.DiscardPending(pending, 'No diff found.')
+        raise base.DiscardPending(
+            pending, 'No file was found in this patchset.')
       self.checkout.apply_patch(patches)
     except checkout.PatchApplicationFailed, e:
       out = 'Can\'t apply patch for file %s.' % e.filename