components/crash/tools/dmp2minidump.py

   1 #!/usr/bin/env python
   2 # Copyright 2013 The Chromium Authors. All rights reserved.
   3 # Use of this source code is governed by a BSD-style license that can be
   4 # found in the LICENSE file.
   5
   6 """A tool to extract minidumps from dmp crash dumps."""
   7
   8 import os
   9 import sys
  10 from cgi import parse_multipart
  11
  12
  13 def ProcessDump(dump_file, minidump_file):
  14   """Extracts the part of the dump file that minidump_stackwalk can read.
  15
  16   The dump files generated by the breakpad integration multi-part form data
  17   that include the minidump as file attachment.
  18
  19   Args:
  20     dump_file: the dump file that needs to be processed.
  21     minidump_file: the file to write the minidump to.
  22   """
  23   try:
  24     dump = open(dump_file, 'rb')
  25     boundary = dump.readline().strip()[2:]
  26     data = parse_multipart(dump, {'boundary': boundary})
  27   except:
  28     print 'Failed to read dmp file %s' % dump_file
  29     return
  30
  31   if not 'upload_file_minidump' in data:
  32     print 'Could not find minidump file in dump.'
  33     return
  34
  35   f = open(minidump_file, 'w')
  36   f.write("\r\n".join(data['upload_file_minidump']))
  37   f.close()
  38
  39
  40 def main():
  41   if len(sys.argv) != 3:
  42     print 'Usage: %s [dmp file] [minidump]' % sys.argv[0]
  43     print ''
  44     print 'Extracts the minidump stored in the crash dump file'
  45     return 1
  46
  47   ProcessDump(sys.argv[1], sys.argv[2])
  48
  49
  50 if '__main__' == __name__:
  51   sys.exit(main())