testing/test_env.py

   1 #!/usr/bin/env python
   2 # Copyright (c) 2012 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 """Sets environment variables needed to run a chromium unit test."""
   7
   8 import os
   9 import stat
  10 import subprocess
  11 import sys
  12
  13 # This is hardcoded to be src/ relative to this script.
  14 ROOT_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
  15
  16 CHROME_SANDBOX_ENV = 'CHROME_DEVEL_SANDBOX'
  17 CHROME_SANDBOX_PATH = '/opt/chromium/chrome_sandbox'
  18
  19
  20 def get_sandbox_env(env):
  21   """Returns the environment flags needed for the SUID sandbox to work."""
  22   extra_env = {}
  23   chrome_sandbox_path = env.get(CHROME_SANDBOX_ENV, CHROME_SANDBOX_PATH)
  24   # The above would silently disable the SUID sandbox if the env value were
  25   # an empty string. We don't want to allow that. http://crbug.com/245376
  26   # TODO(jln): Remove this check once it's no longer possible to disable the
  27   # sandbox that way.
  28   if not chrome_sandbox_path:
  29     chrome_sandbox_path = CHROME_SANDBOX_PATH
  30   extra_env[CHROME_SANDBOX_ENV] = chrome_sandbox_path
  31
  32   return extra_env
  33
  34
  35 def trim_cmd(cmd):
  36   """Removes internal flags from cmd since they're just used to communicate from
  37   the host machine to this script running on the swarm slaves."""
  38   sanitizers = ['asan', 'lsan', 'msan', 'tsan']
  39   internal_flags = frozenset('--%s=%d' % (name, value)
  40                              for name in sanitizers
  41                              for value in [0, 1])
  42   return [i for i in cmd if i not in internal_flags]
  43
  44
  45 def fix_python_path(cmd):
  46   """Returns the fixed command line to call the right python executable."""
  47   out = cmd[:]
  48   if out[0] == 'python':
  49     out[0] = sys.executable
  50   elif out[0].endswith('.py'):
  51     out.insert(0, sys.executable)
  52   return out
  53
  54
  55 def get_sanitizer_env(cmd, asan, lsan, msan, tsan):
  56   """Returns the envirnoment flags needed for sanitizer tools."""
  57
  58   extra_env = {}
  59
  60   # Instruct GTK to use malloc while running sanitizer-instrumented tests.
  61   extra_env['G_SLICE'] = 'always-malloc'
  62
  63   extra_env['NSS_DISABLE_ARENA_FREE_LIST'] = '1'
  64   extra_env['NSS_DISABLE_UNLOAD'] = '1'
  65
  66   # TODO(glider): remove the symbolizer path once
  67   # https://code.google.com/p/address-sanitizer/issues/detail?id=134 is fixed.
  68   symbolizer_path = os.path.abspath(os.path.join(ROOT_DIR, 'third_party',
  69       'llvm-build', 'Release+Asserts', 'bin', 'llvm-symbolizer'))
  70
  71   if lsan or tsan:
  72     # LSan is not sandbox-compatible, so we can use online symbolization. In
  73     # fact, it needs symbolization to be able to apply suppressions.
  74     symbolization_options = ['symbolize=1',
  75                              'external_symbolizer_path=%s' % symbolizer_path]
  76   elif (asan or msan) and sys.platform not in ['win32', 'cygwin']:
  77     # ASan uses a script for offline symbolization, except on Windows.
  78     # Important note: when running ASan with leak detection enabled, we must use
  79     # the LSan symbolization options above.
  80     symbolization_options = ['symbolize=0']
  81     # Set the path to llvm-symbolizer to be used by asan_symbolize.py
  82     extra_env['LLVM_SYMBOLIZER_PATH'] = symbolizer_path
  83   else:
  84     symbolization_options = []
  85
  86   if asan:
  87     asan_options = symbolization_options[:]
  88     if lsan:
  89       asan_options.append('detect_leaks=1')
  90
  91     if asan_options:
  92       extra_env['ASAN_OPTIONS'] = ' '.join(asan_options)
  93
  94     if sys.platform == 'darwin':
  95       isolate_output_dir = os.path.abspath(os.path.dirname(cmd[0]))
  96       # This is needed because the test binary has @executable_path embedded in
  97       # it that the OS tries to resolve to the cache directory and not the
  98       # mapped directory.
  99       extra_env['DYLD_LIBRARY_PATH'] = str(isolate_output_dir)
 100
 101   if lsan:
 102     if asan or msan:
 103       lsan_options = []
 104     else:
 105       lsan_options = symbolization_options[:]
 106     if sys.platform == 'linux2':
 107       # Use the debug version of libstdc++ under LSan. If we don't, there will
 108       # be a lot of incomplete stack traces in the reports.
 109       extra_env['LD_LIBRARY_PATH'] = '/usr/lib/x86_64-linux-gnu/debug:'
 110
 111     extra_env['LSAN_OPTIONS'] = ' '.join(lsan_options)
 112
 113   if msan:
 114     msan_options = symbolization_options[:]
 115     if lsan:
 116       msan_options.append('detect_leaks=1')
 117     extra_env['MSAN_OPTIONS'] = ' '.join(msan_options)
 118
 119   if tsan:
 120     tsan_options = symbolization_options[:]
 121     extra_env['TSAN_OPTIONS'] = ' '.join(tsan_options)
 122
 123   return extra_env
 124
 125
 126 def get_sanitizer_symbolize_command(json_path=None, executable_path=None):
 127   """Construct the command to invoke offline symbolization script."""
 128   script_path = '../tools/valgrind/asan/asan_symbolize.py'
 129   cmd = [sys.executable, script_path]
 130   if json_path is not None:
 131     cmd.append('--test-summary-json-file=%s' % json_path)
 132   if executable_path is not None:
 133     cmd.append('--executable-path=%s' % executable_path)
 134   return cmd
 135
 136
 137 def get_json_path(cmd):
 138   """Extract the JSON test summary path from a command line."""
 139   json_path_flag = '--test-launcher-summary-output='
 140   for arg in cmd:
 141     if arg.startswith(json_path_flag):
 142       return arg.split(json_path_flag).pop()
 143   return None
 144
 145
 146 def symbolize_snippets_in_json(cmd, env):
 147   """Symbolize output snippets inside the JSON test summary."""
 148   json_path = get_json_path(cmd)
 149   if json_path is None:
 150     return
 151
 152   try:
 153     symbolize_command = get_sanitizer_symbolize_command(
 154         json_path=json_path, executable_path=cmd[0])
 155     p = subprocess.Popen(symbolize_command, stderr=subprocess.PIPE, env=env)
 156     (_, stderr) = p.communicate()
 157   except OSError as e:
 158       print 'Exception while symbolizing snippets: %s' % e
 159
 160   if p.returncode != 0:
 161     print "Error: failed to symbolize snippets in JSON:\n"
 162     print stderr
 163
 164
 165 def run_executable(cmd, env):
 166   """Runs an executable with:
 167     - environment variable CR_SOURCE_ROOT set to the root directory.
 168     - environment variable LANGUAGE to en_US.UTF-8.
 169     - environment variable CHROME_DEVEL_SANDBOX set
 170     - Reuses sys.executable automatically.
 171   """
 172   extra_env = {}
 173   # Many tests assume a English interface...
 174   extra_env['LANG'] = 'en_US.UTF-8'
 175   # Used by base/base_paths_linux.cc as an override. Just make sure the default
 176   # logic is used.
 177   env.pop('CR_SOURCE_ROOT', None)
 178   extra_env.update(get_sandbox_env(env))
 179
 180   # Copy logic from  tools/build/scripts/slave/runtest.py.
 181   asan = '--asan=1' in cmd
 182   lsan = '--lsan=1' in cmd
 183   msan = '--msan=1' in cmd
 184   tsan = '--tsan=1' in cmd
 185   if sys.platform in ['win32', 'cygwin']:
 186     # Symbolization works in-process on Windows even when sandboxed.
 187     use_symbolization_script = False
 188   else:
 189     # LSan doesn't support sandboxing yet, so we use the in-process symbolizer.
 190     # Note that ASan and MSan can work together with LSan.
 191     use_symbolization_script = (asan or msan) and not lsan
 192
 193   if asan or lsan or msan or tsan:
 194     extra_env.update(get_sanitizer_env(cmd, asan, lsan, msan, tsan))
 195
 196   if lsan or tsan:
 197     # LSan and TSan are not sandbox-friendly.
 198     cmd.append('--no-sandbox')
 199
 200   cmd = trim_cmd(cmd)
 201
 202   # Ensure paths are correctly separated on windows.
 203   cmd[0] = cmd[0].replace('/', os.path.sep)
 204   cmd = fix_python_path(cmd)
 205
 206   print('Additional test environment:\n%s\n'
 207         'Command: %s\n' % (
 208         '\n'.join('    %s=%s' %
 209             (k, v) for k, v in sorted(extra_env.iteritems())),
 210         ' '.join(cmd)))
 211   env.update(extra_env or {})
 212   try:
 213     # See above comment regarding offline symbolization.
 214     if use_symbolization_script:
 215       # Need to pipe to the symbolizer script.
 216       p1 = subprocess.Popen(cmd, env=env, stdout=subprocess.PIPE,
 217                             stderr=sys.stdout)
 218       p2 = subprocess.Popen(
 219           get_sanitizer_symbolize_command(executable_path=cmd[0]),
 220           env=env, stdin=p1.stdout)
 221       p1.stdout.close()  # Allow p1 to receive a SIGPIPE if p2 exits.
 222       p1.wait()
 223       p2.wait()
 224       # Also feed the out-of-band JSON output to the symbolizer script.
 225       symbolize_snippets_in_json(cmd, env)
 226       return p1.returncode
 227     else:
 228       return subprocess.call(cmd, env=env)
 229   except OSError:
 230     print >> sys.stderr, 'Failed to start %s' % cmd
 231     raise
 232
 233
 234 def main():
 235   return run_executable(sys.argv[1:], os.environ.copy())
 236
 237
 238 if __name__ == '__main__':
 239   sys.exit(main())