offlineasm/self_hash.rb

   1 # Copyright (C) 2011 Apple Inc. All rights reserved.
   2 #
   3 # Redistribution and use in source and binary forms, with or without
   4 # modification, are permitted provided that the following conditions
   5 # are met:
   6 # 1. Redistributions of source code must retain the above copyright
   7 #    notice, this list of conditions and the following disclaimer.
   8 # 2. Redistributions in binary form must reproduce the above copyright
   9 #    notice, this list of conditions and the following disclaimer in the
  10 #    documentation and/or other materials provided with the distribution.
  11 #
  12 # THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
  13 # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  14 # THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  15 # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  16 # BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  17 # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  18 # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  19 # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  20 # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  21 # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  22 # THE POSSIBILITY OF SUCH DAMAGE.
  23
  24 require "digest/sha1"
  25 require "pathname"
  26
  27 #
  28 # dirHash(directory, regexp) -> SHA1 hexdigest
  29 #
  30 # Returns a hash of all files in the given directory that fit the given
  31 # pattern.
  32 #
  33
  34 def dirHash(directory, regexp)
  35     directory = Pathname.new(directory)
  36     contents = ""
  37     Dir.foreach(directory) {
  38         | entry |
  39         if entry =~ regexp
  40             contents += IO::read(directory + entry)
  41         end
  42     }
  43     return Digest::SHA1.hexdigest(contents)
  44 end
  45
  46 #
  47 # selfHash -> SHA1 hexdigest
  48 #
  49 # Returns a hash of the offlineasm source code. This allows dependency
  50 # tracking for not just changes in input, but also changes in the assembler
  51 # itself.
  52 #
  53
  54 def selfHash
  55     dirHash(Pathname.new(__FILE__).dirname, /\.rb$/)
  56 end
  57