third_party/WebKit/Source/devtools/scripts/devtools_file_hashes.py

   1 #!/usr/bin/env python
   2 # Copyright (c) 2014 Google Inc. All rights reserved.
   3 #
   4 # Redistribution and use in source and binary forms, with or without
   5 # modification, are permitted provided that the following conditions are
   6 # met:
   7 #
   8 #     * Redistributions of source code must retain the above copyright
   9 # notice, this list of conditions and the following disclaimer.
  10 #     * Redistributions in binary form must reproduce the above
  11 # copyright notice, this list of conditions and the following disclaimer
  12 # in the documentation and/or other materials provided with the
  13 # distribution.
  14 #     * Neither the name of Google Inc. nor the names of its
  15 # contributors may be used to endorse or promote products derived from
  16 # this software without specific prior written permission.
  17 #
  18 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  24 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29
  30 import hashlib
  31 import os.path
  32
  33 try:
  34     import json
  35 except ImportError:
  36     import simplejson as json
  37
  38
  39 def save_hashes(hashes_file_path, hashes):
  40     try:
  41         with open(hashes_file_path, "wt") as hashes_file:
  42             json.dump(hashes, hashes_file, indent=4, separators=(",", ": "))
  43     except:
  44         print "ERROR: Failed to write %s" % hashes_file_path
  45         raise
  46
  47
  48 def load_hashes(hashes_file_path):
  49     try:
  50         with open(hashes_file_path, "r") as hashes_file:
  51             hashes = json.load(hashes_file)
  52     except:
  53         return {}
  54     return hashes
  55
  56
  57 def calculate_file_hash(file_path):
  58     with open(file_path) as file:
  59         data = file.read()
  60         md5_hash = hashlib.md5(data).hexdigest()
  61     return md5_hash
  62
  63
  64 def files_with_invalid_hashes(hash_file_path, file_paths):
  65     hashes = load_hashes(hash_file_path)
  66     result = []
  67     for file_path in file_paths:
  68         file_name = os.path.basename(file_path)
  69         if calculate_file_hash(file_path) != hashes.get(file_name, ""):
  70             result.append(file_path)
  71     return result
  72
  73
  74 def update_file_hashes(hash_file_path, file_paths):
  75     hashes = {}
  76     for file_path in file_paths:
  77         file_name = os.path.basename(file_path)
  78         hashes[file_name] = calculate_file_hash(file_path)
  79     save_hashes(hash_file_path, hashes)