--- a/mozillatry.py	Fri Dec 07 11:41:27 2012 -0800
+++ b/mozillatry.py	Fri Dec 07 14:53:54 2012 -0800
@@ -7,6 +7,7 @@
 import configuration
 import optparse
 import os
+import shutil
 import sys
 
 from subprocess import check_call as call
@@ -16,6 +17,9 @@
     assert os.path.exists(directory) and os.path.isdir(directory)
     hg_dir = os.path.join(directory, '.hg')
     assert os.path.exists(hg_dir) and os.path.isdir(hg_dir)
+    patches = os.path.join(hg_dir, 'patches')
+    if os.path.exists(patches):
+        shutil.rmtree(patches)
     call(['hg', 'revert', '--no-backup', '--all'], cwd=directory)
     call(['hg', 'qpop', '--all'], cwd=directory)
     try:
@@ -23,19 +27,20 @@
     except:
         pass
 
-def update(directory):
-    """update a mozilla-central checkout"""
+def update_repo(directory):
+    """update an hg repository"""
     assert os.path.exists(directory) and os.path.isdir(directory)
     reset(directory)
     call(['hg', 'pull'], cwd=directory)
     call(['hg', 'update'], cwd=directory)
     call(['hg', 'qinit'], cwd=directory)
 
-def push_to_try(patches, repo, commit, _try='ssh://hg.mozilla.org/try/'):
+def push_to_try(patches, repo, commit, _try='ssh://hg.mozilla.org/try/', update=True):
     """push a series of patches to try repository"""
 
     # ensure the repo is in a good state
-    update(repo)
+    if update:
+        update_repo(repo)
 
     try:
         # apply patches