Removes files from //build that we don't need

build/android/gyp/util/md5_check.py

-# Copyright 2013 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-import hashlib
-import os
-
-
-def CallAndRecordIfStale(
-    function, record_path=None, input_paths=None, input_strings=None,
-    force=False):
-  """Calls function if the md5sum of the input paths/strings has changed.
-
-  The md5sum of the inputs is compared with the one stored in record_path. If
-  this has changed (or the record doesn't exist), function will be called and
-  the new md5sum will be recorded.
-
-  If force is True, the function will be called regardless of whether the
-  md5sum is out of date.
-  """
-  if not input_paths:
-    input_paths = []
-  if not input_strings:
-    input_strings = []
-  md5_checker = _Md5Checker(
-      record_path=record_path,
-      input_paths=input_paths,
-      input_strings=input_strings)
-  if force or md5_checker.IsStale():
-    function()
-    md5_checker.Write()
-
-
-def _UpdateMd5ForFile(md5, path, block_size=2**16):
-  with open(path, 'rb') as infile:
-    while True:
-      data = infile.read(block_size)
-      if not data:
-        break
-      md5.update(data)
-
-
-def _UpdateMd5ForDirectory(md5, dir_path):
-  for root, _, files in os.walk(dir_path):
-    for f in files:
-      _UpdateMd5ForFile(md5, os.path.join(root, f))
-
-
-def _UpdateMd5ForPath(md5, path):
-  if os.path.isdir(path):
-    _UpdateMd5ForDirectory(md5, path)
-  else:
-    _UpdateMd5ForFile(md5, path)
-
-
-class _Md5Checker(object):
-  def __init__(self, record_path=None, input_paths=None, input_strings=None):
-    if not input_paths:
-      input_paths = []
-    if not input_strings:
-      input_strings = []
-
-    assert record_path.endswith('.stamp'), (
-        'record paths must end in \'.stamp\' so that they are easy to find '
-        'and delete')
-
-    self.record_path = record_path
-
-    md5 = hashlib.md5()
-    for i in sorted(input_paths):
-      _UpdateMd5ForPath(md5, i)
-    for s in input_strings:
-      md5.update(s)
-    self.new_digest = md5.hexdigest()
-
-    self.old_digest = ''
-    if os.path.exists(self.record_path):
-      with open(self.record_path, 'r') as old_record:
-        self.old_digest = old_record.read()
-
-  def IsStale(self):
-    return self.old_digest != self.new_digest
-
-  def Write(self):
-    with open(self.record_path, 'w') as new_record:
-      new_record.write(self.new_digest)