Add a first test for tools/find_runtime_symbols.

tools/find_runtime_symbols/prepare_symbol_info.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 import json
 import logging
 import os
 import re
 import shutil
 import subprocess
 import sys
 import tempfile
 
 from proc_maps import ProcMaps
 
 
 LOGGER = logging.getLogger('prepare_symbol_info')
 
 
 def _dump_command_result(command, output_dir_path, basename, suffix):
   handle_out, filename_out = tempfile.mkstemp(
       suffix=suffix, prefix=basename + '.', dir=output_dir_path)
   handle_err, filename_err = tempfile.mkstemp(
       suffix=suffix + '.err', prefix=basename + '.', dir=output_dir_path)
   error = False
   try:
     subprocess.check_call(
         command, stdout=handle_out, stderr=handle_err, shell=True)
-  except:
+  except (OSError, subprocess.CalledProcessError):
     error = True
   finally:
     os.close(handle_err)
     os.close(handle_out)
 
   if os.path.exists(filename_err):
     if LOGGER.getEffectiveLevel() <= logging.DEBUG:
       with open(filename_err, 'r') as f:
         for line in f:
           LOGGER.debug(line.rstrip())
@@ skipping 64 matching lines @@
           output_dir_path = tempfile.mkdtemp()
           used_tempdir = True
           LOGGER.warn('Using a temporary directory "%s".' % output_dir_path)
         else:
           LOGGER.warn('The directory "%s" is not available.' % output_dir_path)
           return None, used_tempdir
   else:
     LOGGER.info('Creating a new directory "%s".' % output_dir_path)
     try:
       os.mkdir(output_dir_path)
-    except OSError, e:
+    except OSError:
       LOGGER.warn('A directory "%s" cannot be created.' % output_dir_path)
       if use_tempdir:
         output_dir_path = tempfile.mkdtemp()
         used_tempdir = True
         LOGGER.warn('Using a temporary directory "%s".' % output_dir_path)
       else:
         LOGGER.warn('The directory "%s" is not available.' % output_dir_path)
         return None, used_tempdir
 
   shutil.copyfile(maps_path, os.path.join(output_dir_path, 'maps'))
@@ skipping 52 matching lines @@
   elif len(sys.argv) == 2:
     result, _ = prepare_symbol_info(sys.argv[1])
   else:
     result, _ = prepare_symbol_info(sys.argv[1], sys.argv[2])
 
   return not result
 
 
 if __name__ == '__main__':
   sys.exit(main())