[chromedriver] Clean tmp directory and kill Chrome processes before each run cycle.

chrome/test/chromedriver/run_buildbot_steps.py

 #!/usr/bin/env python
 # Copyright (c) 2013 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.
 
 """Runs all the buildbot steps for ChromeDriver except for update/compile."""
 
 import optparse
 import os
 import subprocess
+import shutil
 import sys
+import tempfile
 import urllib2
 import zipfile
 
 _THIS_DIR = os.path.abspath(os.path.dirname(__file__))
 sys.path.insert(0, os.path.join(_THIS_DIR, os.pardir, 'pylib'))
 
 from common import chrome_paths
 from common import util
 
 GS_BUCKET = 'gs://chromedriver-prebuilts'
@@ skipping 101 matching lines @@
     '--project', 'chromedriver',
     '--user', 'chromedriver.bot@gmail.com',
     '--label', 'Release',
     zip_path
   ]
   with open(os.devnull, 'wb') as no_output:
     if subprocess.Popen(cmd, stdout=no_output, stderr=no_output).wait():
       print '@@@STEP_FAILURE@@@'
 
 
+def KillChromes():
+  chrome_map = {
+      'win': 'chrome.exe',
+      'mac': 'Chromium',
+      'linux': 'chrome',
+  }
+  if util.IsWindows():
+    cmd = ['taskkill', '/F', '/IM']
+  else:
+    cmd = ['pkill', '-9']
+  cmd.append(chrome_map[util.GetPlatformName()])
+  util.RunCommand(cmd)
+
+
+def CleanTmpDir():
+  tmp_dir = tempfile.gettempdir()
+  print 'cleaning temp directory:', tmp_dir
+  for file_name in os.listdir(tmp_dir):
+    if os.path.isdir(os.path.join(tmp_dir, file_name)):
+      print 'deleting sub-directory', file_name
+      shutil.rmtree(os.path.join(tmp_dir, file_name), True)
+
+
 def main():
   parser = optparse.OptionParser()
   parser.add_option(
       '', '--android-package',
       help='Application package name, if running tests on Android.')
   parser.add_option(
       '-r', '--revision', type='string', default=None,
       help='Chromium revision')
   options, _ = parser.parse_args()
 
+  if not options.android_package:
+    KillChromes()
+  CleanTmpDir()
+
   if options.android_package:
     Download()
   else:
     if options.revision is None:
       parser.error('Must supply a --revision')
 
     platform = util.GetPlatformName()
     if 'linux' in platform:
       Archive(options.revision)
 
   cmd = [
     sys.executable,
     os.path.join(_THIS_DIR, 'run_all_tests.py'),
   ]
   if options.android_package:
     cmd.append('--android-package=' + options.android_package)
 
   passed = (util.RunCommand(cmd) == 0)
 
   if not options.android_package and passed:
     MaybeRelease(options.revision)
 
 
 if __name__ == '__main__':
   main()