Enable Chrome Sandbox with run_test_cases.py

testing/test_env.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.
 
 """Sets environment variables needed to run a chromium unit test."""
 
 import os
+import stat
 import subprocess
 import sys
 
 # This is hardcoded to be src/ relative to this script.
 ROOT_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
 
+CHROME_SANDBOX_ENV = 'CHROME_DEVEL_SANDBOX'
+CHROME_SANDBOX_PATH = '/opt/chromium/chrome_sandbox'
+
+
+def should_enable_sandbox(sandbox_path):
+  """Return a boolean indicating that the current slave is capable of using the
+  sandbox and should enable it.  This should return True iff the slave is a
+  Linux host with the sandbox file present and configured correctly."""
+  if not (sys.platform.startswith('linux') and
+          os.path.exists(sandbox_path)):
+    return False
+  sandbox_stat = os.stat(sandbox_path)
+  if ((sandbox_stat.st_mode & stat.S_ISUID) and
+      (sandbox_stat.st_mode & stat.S_IRUSR) and
+      (sandbox_stat.st_mode & stat.S_IXUSR) and
+      (sandbox_stat.st_uid == 0)):
+    return True
+  return False
+
+
+def enable_sandbox_if_required(env, verbose=False):
+  """Checks enables the sandbox if it is required, otherwise it disables it."""
+  chrome_sandbox_path = env.get(CHROME_SANDBOX_ENV, CHROME_SANDBOX_PATH)
+
+  if should_enable_sandbox(chrome_sandbox_path):
+    if verbose:
+      print 'Enabling sandbox. Setting environment variable:'
+      print '  %s="%s"' % (CHROME_SANDBOX_ENV, chrome_sandbox_path)
+    env[CHROME_SANDBOX_ENV] = chrome_sandbox_path
+  else:
+    if verbose:
+      print 'Disabling sandbox. Setting environment variable:'
+      print '  %s=""' % CHROME_SANDBOX_ENV
+    env[CHROME_SANDBOX_ENV] = ''
+
 
 def fix_python_path(cmd):
   """Returns the fixed command line to call the right python executable."""
   out = cmd[:]
   if out[0] == 'python':
     out[0] = sys.executable
   elif out[0].endswith('.py'):
     out.insert(0, sys.executable)
   return out
 
 
 def run_executable(cmd, env):
   """Runs an executable with:
     - environment variable CR_SOURCE_ROOT set to the root directory.
     - environment variable LANGUAGE to en_US.UTF-8.
+    - environment variable CHROME_DEVEL_SANDBOX set if need
     - Reuses sys.executable automatically.
   """
   # Many tests assume a English interface...
   env['LANG'] = 'en_US.UTF-8'
   # Used by base/base_paths_linux.cc as an override. Just make sure the default
   # logic is used.
   env.pop('CR_SOURCE_ROOT', None)
+  enable_sandbox_if_required(env)
   # Ensure paths are correctly separated on windows.
   cmd[0] = cmd[0].replace('/', os.path.sep)
   cmd = fix_python_path(cmd)
   try:
     return subprocess.call(cmd, env=env)
   except OSError:
     print >> sys.stderr, 'Failed to start %s' % cmd
     raise
 
 
 def main():
   return run_executable(sys.argv[1:], os.environ.copy())
 
 
 if __name__ == '__main__':
   sys.exit(main())