diff --git a/gcl.py b/gcl.py
index 4dfed3389..84819279b 100755
--- a/gcl.py
+++ b/gcl.py
@@ -831,16 +831,6 @@ def TryChange(change_info, args, swallow_exception):
     root = os.path.join(root, '')
     return subpath[len(root):]
 
-  # Try to find the gclient root.
-  def FindGclientRootDir(from_dir):
-    path = os.path.realpath(from_dir)
-    while not os.path.exists(os.path.join(path, '.gclient')):
-      next = os.path.split(path)
-      if not next[1]:
-        return None
-      path = next[0]
-    return path
-
   trychange_args = []
   settings = {
     'port': GetCodeReviewSetting('TRYSERVER_HTTP_PORT'),
@@ -854,7 +844,7 @@ def TryChange(change_info, args, swallow_exception):
     if v:
       trychange_args.extend(['--' + k, v])
 
-  gclient_root = FindGclientRootDir(GetRepositoryRoot())
+  gclient_root = gclient_utils.FindGclientRoot(GetRepositoryRoot())
   if gclient_root:
     trychange_args.extend(['--root', PathDifference(gclient_root,
                                                     GetRepositoryRoot())])
diff --git a/gclient_utils.py b/gclient_utils.py
index 4944cf967..97d05edd1 100644
--- a/gclient_utils.py
+++ b/gclient_utils.py
@@ -307,3 +307,13 @@ def IsUsingGit(root, paths):
     if os.path.exists(os.path.join(root, path, '.git')):
       return True
   return False
+
+def FindGclientRoot(from_dir):
+  """Tries to find the gclient root."""
+  path = os.path.realpath(from_dir)
+  while not os.path.exists(os.path.join(path, '.gclient')):
+    next = os.path.split(path)
+    if not next[1]:
+      return None
+    path = next[0]
+  return path
diff --git a/scm.py b/scm.py
index 2e1355588..db4711e36 100644
--- a/scm.py
+++ b/scm.py
@@ -177,12 +177,17 @@ class GIT(object):
     return upstream_branch
 
   @staticmethod
-  def GenerateDiff(cwd, branch=None):
-    """Diffs against the upstream branch or optionally another branch."""
+  def GenerateDiff(cwd, branch=None, full_move=False):
+    """Diffs against the upstream branch or optionally another branch.
+
+    full_move means that move or copy operations should completely recreate the
+    files, usually in the prospect to apply the patch for a try job."""
     if not branch:
       branch = GIT.GetUpstream(cwd)
-    diff = GIT.Capture(['diff-tree', '-p', '--no-prefix', branch, 'HEAD'],
-                       cwd).splitlines(True)
+    command = ['diff-tree', '-p', '--no-prefix', branch, 'HEAD']
+    if not full_move:
+      command.append('-C')
+    diff = GIT.Capture(command, cwd).splitlines(True)
     for i in range(len(diff)):
       # In the case of added files, replace /dev/null with the path to the
       # file being added.
@@ -524,7 +529,9 @@ class SVN(object):
     """Diffs a single file.
 
     Be sure to be in the appropriate directory before calling to have the
-    expected relative path."""
+    expected relative path.
+    full_move means that move or copy operations should completely recreate the
+    files, usually in the prospect to apply the patch for a try job."""
     # Use svn info output instead of os.path.isdir because the latter fails
     # when the file is deleted.
     if SVN.CaptureInfo(filename).get("Node Kind") == "directory":
diff --git a/tests/gclient_utils_test.py b/tests/gclient_utils_test.py
index c769e2093..bb4e313d2 100644
--- a/tests/gclient_utils_test.py
+++ b/tests/gclient_utils_test.py
@@ -15,6 +15,7 @@ class GclientUtilsUnittest(SuperMoxTestBase):
   def testMembersChanged(self):
     members = [
         'CheckCall', 'CheckCallError', 'Error', 'FileRead', 'FileWrite',
+        'FindGclientRoot',
         'FullUrlFromRelative', 'FullUrlFromRelative2', 'GetNamedNodeText',
         'GetNodeNamedAttributeText', 'IsUsingGit', 'ParseXML',
         'PrintableObject', 'RemoveDirectory', 'SplitUrlRevision',
diff --git a/tests/trychange_unittest.py b/tests/trychange_unittest.py
index 298865cb8..f972040b5 100644
--- a/tests/trychange_unittest.py
+++ b/tests/trychange_unittest.py
@@ -83,7 +83,8 @@ class GITUnittest(TryChangeTestsBase):
   def testBasic(self):
     trychange.os.getcwd().AndReturn(self.fake_root)
     trychange.scm.GIT.GetCheckoutRoot(self.fake_root).AndReturn(self.fake_root)
-    trychange.scm.GIT.GenerateDiff(self.fake_root).AndReturn('a diff')
+    trychange.scm.GIT.GenerateDiff(self.fake_root,
+                                   full_move=True).AndReturn('a diff')
     trychange.scm.GIT.GetPatchName(self.fake_root).AndReturn('bleh-1233')
     trychange.scm.GIT.GetEmail(self.fake_root).AndReturn('georges@example.com')
     self.mox.ReplayAll()
diff --git a/trychange.py b/trychange.py
index b53a4f5b6..41c7f9f93 100755
--- a/trychange.py
+++ b/trychange.py
@@ -132,7 +132,8 @@ class GIT(SCM):
     SCM.__init__(self, *args, **kwargs)
     self.checkout_root = scm.GIT.GetCheckoutRoot(os.getcwd())
     if not self.options.diff:
-      self.options.diff = scm.GIT.GenerateDiff(self.checkout_root)
+      self.options.diff = scm.GIT.GenerateDiff(self.checkout_root,
+                                               full_move=True)
     if not self.options.name:
       self.options.name = scm.GIT.GetPatchName(self.checkout_root)
     if not self.options.email: