text: #!/usr/bin/env python
  
  # Copyright (C) 2016 Red Hat, Inc.
  #
  # 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 print_function
  
  import argparse
  import glob
  import json
  import mmap
  import os
  import re
  import sys
  
  parser = argparse.ArgumentParser()
  parser.add_argument("filenames", help="list of files to check, all files if unspecified", nargs='*')
  
  rootdir = os.path.dirname(__file__) + "/../../"
  rootdir = os.path.abspath(rootdir)
  parser.add_argument("--rootdir", default=rootdir, help="root directory to examine")
  
  default_boilerplate_dir = os.path.join(rootdir, "hack/boilerplate")
  parser.add_argument("--boilerplate-dir", default=default_boilerplate_dir)
  args = parser.parse_args()
  
  
  def get_refs():
      refs = {}
  
      for path in glob.glob(os.path.join(args.boilerplate_dir, "boilerplate.*.txt")):
          extension = os.path.basename(path).split(".")[1]
  
          ref_file = open(path, 'r')
          ref = ref_file.read().splitlines()
          ref_file.close()
          refs[extension] = ref
  
      return refs
  
  def file_passes(filename, refs, regexs):
      try:
          f = open(filename, 'r')
      except:
          return False
  
      data = f.read()
      f.close()
  
      basename = os.path.basename(filename)
      extension = file_extension(filename)
      if extension != "":
          ref = refs[extension]
      else:
          ref = refs[basename]
  
      # remove build tags from the top of Go files
      if extension == "go":
          p = regexs["go_build_constraints"]
          (data, found) = p.subn("", data, 1)
  
      # remove shebang from the top of shell files
      if extension == "sh":
          p = regexs["shebang"]
          (data, found) = p.subn("", data, 1)
  
      data = data.splitlines()
  
      # if our test file is smaller than the reference it surely fails!
      if len(ref) > len(data):
          return False
  
      # trim our file to the same number of lines as the reference file
      data = data[:len(ref)]
  
      p = regexs["year"]
      for d in data:
          if p.search(d):
              return False
  
      # Replace all occurrences of the regex "2016|2015|2014" with "YEAR"
      p = regexs["date"]
      for i, d in enumerate(data):
          (data[i], found) = p.subn('YEAR', d)
          if found != 0:
              break
  
      # if we don't match the reference at this point, fail
      if ref != data:
          return False
  
      return True
  
  def file_extension(filename):
      return os.path.splitext(filename)[1].split(".")[-1].lower()
  
  skipped_dirs = ['Godeps', 'third_party', '_gopath', '_output', '.git', 'cluster/env.sh', "vendor", "test/e2e/generated/bindata.go"]
  
  def normalize_files(files):
      newfiles = []
      for pathname in files:
          if any(x in pathname for x in skipped_dirs):
              continue
          newfiles.append(pathname)
      for i, pathname in enumerate(newfiles):
          if not os.path.isabs(pathname):
              newfiles[i] = os.path.join(args.rootdir, pathname)
      return newfiles
  
  def get_files(extensions):
      files = []
      if len(args.filenames) > 0:
          files = args.filenames
      else:
          for root, dirs, walkfiles in os.walk(args.rootdir):
              # don't visit certain dirs. This is just a performance improvement
              # as we would prune these later in normalize_files(). But doing it
              # cuts down the amount of filesystem walking we do and cuts down
              # the size of the file list
              for d in skipped_dirs:
                  if d in dirs:
                      dirs.remove(d)
  
              for name in walkfiles:
                  pathname = os.path.join(root, name)
                  files.append(pathname)
  
      files = normalize_files(files)
      outfiles = []
      for pathname in files:
          basename = os.path.basename(pathname)
          extension = file_extension(pathname)
          if extension in extensions or basename in extensions:
              outfiles.append(pathname)
      return outfiles
  
  def get_regexs():
      regexs = {}
      # Search for "YEAR" which exists in the boilerplate, but shouldn't in the real thing
      regexs["year"] = re.compile( 'YEAR' )
      # dates can be 2014, 2015 or 2016, company holder names can be anything
      regexs["date"] = re.compile( '(2014|2015|2016)' )
      # strip // +build \n\n build constraints
      regexs["go_build_constraints"] = re.compile(r"^(// \+build.*\n)+\n", re.MULTILINE)
      # strip #!.* from shell scripts
      regexs["shebang"] = re.compile(r"^(#!.*\n)\n*", re.MULTILINE)
      return regexs
  
  def main():
      regexs = get_regexs()
      refs = get_refs()
      filenames = get_files(refs.keys())
  
      for filename in filenames:
          if not file_passes(filename, refs, regexs):
              print(filename, file=sys.stdout)
  
  if __name__ == "__main__":
    sys.exit(main())
  