Only presubmit check files in git repo for copyright note etc. (if using git).

tools/presubmit.py

 #!/usr/bin/env python
 #
 # Copyright 2011 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 24 matching lines @@
   md5er = md5.new
 
 
 import optparse
 import os
 from os.path import abspath, join, dirname, basename, exists
 import pickle
 import re
 import sys
 import subprocess
+from subprocess import PIPE
 
 # Disabled LINT rules and reason.
 # build/include_what_you_use: Started giving false positives for variables
 #  named "string" and "map" assuming that you needed to include STL headers.
 
 ENABLED_LINT_RULES = """
 build/class
 build/deprecated
 build/endif_comment
 build/forward_decl
@@ skipping 174 matching lines @@
     r'Copyright [\d-]*20[0-1][0-9] the V8 project authors. All rights reserved.')
 
 class SourceProcessor(SourceFileProcessor):
   """
   Check that all files include a copyright notice and no trailing whitespaces.
   """
 
   RELEVANT_EXTENSIONS = ['.js', '.cc', '.h', '.py', '.c', 'SConscript',
       'SConstruct', '.status', '.gyp', '.gypi']
 
+  # Overwriting the one in the parent class.
+  def FindFilesIn(self, path):
+    if os.path.exists(path+'/.git'):
+      output = subprocess.Popen('git ls-files --full-name',
+                                stdout=PIPE, cwd=path, shell=True)
+      result = []
+      for file in output.stdout.read().split():
+        for dir_part in os.path.dirname(file).split(os.sep):
+          if self.IgnoreDir(dir_part):
+            break
+        else:
+          if self.IsRelevant(file) and not self.IgnoreFile(file):
+            result.append(join(path, file))
+      if output.wait() == 0:
+        return result
+    return super(SourceProcessor, self).FindFilesIn(path)
+
   def IsRelevant(self, name):
     for ext in SourceProcessor.RELEVANT_EXTENSIONS:
       if name.endswith(ext):
         return True
     return False
 
   def GetPathsToSearch(self):
     return ['.']
 
   def IgnoreDir(self, name):
@@ skipping 70 matching lines @@
     success = CppLintProcessor().Run(workspace) and success
   success = SourceProcessor().Run(workspace) and success
   if success:
     return 0
   else:
     return 1
 
 
 if __name__ == '__main__':
   sys.exit(Main())