text: #!/usr/bin/env python
  # Copyright 2017 IBM Corp.
  #
  # All Rights Reserved.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  from __future__ import nested_scopes, generators, division, absolute_import, \
      with_statement, print_function, unicode_literals
  
  import sys
  import subprocess
  from datetime import datetime
  import re
  
  
  def get_changed_files():
      return subprocess.check_output(
          ['git', 'diff', 'HEAD~', '--name-only', '--diff-filter=d'])
  
  
  current_year = str(datetime.today().year)
  
  no_errors = True
  errors = []
  
  for changed_file in get_changed_files().splitlines():
      with open(changed_file, 'r') as f:
          for line in f:
              match = re.search("Copyright (\d{4}) IBM", line)
              if match:
                  if match and match.group(1) != current_year:
                      no_errors = False
                      errors.append("%s: \"%s\"" % (changed_file, line.rstrip()))
  
  if no_errors:
      sys.exit(0)
  else:
      for error in errors:
          print("Outdated copyright year in file %s" % error)
      sys.exit(1)
  