Adding extra debugging to extension docs build process.

chrome/common/extensions/docs/build/directory.py

 #!/usr/bin/python
 # Copyright (c) 2010 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.
 
 """Class for parsing metadata about extension samples."""
 
 import locale
 import os
 import os.path
@@ skipping 622 matching lines @@
     zip_path = os.path.join(sample_parentpath, zip_filename)
     zip_manifest_path = os.path.join(sample_dirname, 'manifest.json')
 
     zipfile.ZipFile.debug = 3
 
     if os.path.isfile(zip_path):
       try:
         old_zip_file = zipfile.ZipFile(zip_path, 'r')
       except IOError, msg:
         raise Exception("Could not read zip at %s: %s" % (zip_path, msg))
+      except zipfile.BadZipfile, msg:
+        raise Exception("File at %s is not a zip file: %s" % (zip_path, msg))
 
       try:
         info = old_zip_file.getinfo(zip_manifest_path)
         hash = info.comment
         if hash == self['source_hash']:
           return None    # Hashes match - no need to generate file
       except KeyError, msg:
         pass             # The old zip file doesn't contain a hash - overwrite
       finally:
         old_zip_file.close()
@@ skipping 13 matching lines @@
           zip_file.write(abspath, relpath)
           if file == 'manifest.json':
             info = zip_file.getinfo(zip_manifest_path)
             info.comment = self['source_hash']
     except RuntimeError, msg:
       raise Exception("Could not write zip at %s: %s" % (zip_path, msg))
     finally:
       zip_file.close()
 
     return self._get_relative_zip_path()