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 "config"
  25 require "digest/sha1"
  26 require "pathname"
  27
  28 #
  29 # dirHash(directory, regexp) -> SHA1 hexdigest
  30 #
  31 # Returns a hash of all files in the given directory that fit the given
  32 # pattern.
  33 #
  34
  35 def dirHash(directory, regexp)
  36     directory = Pathname.new(directory)
  37     contents = ""
  38     Dir.foreach(directory) {
  39         | entry |
  40         if entry =~ regexp
  41             contents += IO::read(directory + entry)
  42         end
  43     }
  44     return Digest::SHA1.hexdigest(contents)
  45 end
  46
  47 #
  48 # fileListHash(fileList) -> SHA1 hexdigest
  49 #
  50 # Returns a hash of all files in the list.
  51 #
  52
  53 def fileListHash(fileList)
  54     contents = ""
  55     fileList.each {
  56         | fileName |
  57         contents += IO::read(fileName)
  58     }
  59     return Digest::SHA1.hexdigest(contents)
  60 end
  61
  62 #
  63 # selfHash -> SHA1 hexdigest
  64 #
  65 # Returns a hash of the offlineasm source code. This allows dependency
  66 # tracking for not just changes in input, but also changes in the assembler
  67 # itself.
  68 #
  69
  70 def selfHash
  71     dirHash(Pathname.new(__FILE__).dirname, /\.rb$/)
  72 end
  73