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:
  77     # ASan uses a script for offline symbolization.
  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
  84   if asan:
  85     asan_options = symbolization_options[:]
  86     if lsan:
  87       asan_options.append('detect_leaks=1')
  88
  89     extra_env['ASAN_OPTIONS'] = ' '.join(asan_options)
  90
  91     if sys.platform == 'darwin':
  92       isolate_output_dir = os.path.abspath(os.path.dirname(cmd[0]))
  93       # This is needed because the test binary has @executable_path embedded in
  94       # it that the OS tries to resolve to the cache directory and not the
  95       # mapped directory.
  96       extra_env['DYLD_LIBRARY_PATH'] = str(isolate_output_dir)
  97
  98   if lsan:
  99     if asan or msan:
 100       lsan_options = []
 101     else:
 102       lsan_options = symbolization_options[:]
 103     if sys.platform == 'linux2':
 104       # Use the debug version of libstdc++ under LSan. If we don't, there will
 105       # be a lot of incomplete stack traces in the reports.
 106       extra_env['LD_LIBRARY_PATH'] = '/usr/lib/x86_64-linux-gnu/debug:'
 107
 108     suppressions_file = os.path.join(ROOT_DIR, 'tools', 'lsan',
 109         'suppressions.txt')
 110     lsan_options += ['suppressions=%s' % suppressions_file,
 111                      'print_suppressions=1']
 112     extra_env['LSAN_OPTIONS'] = ' '.join(lsan_options)
 113
 114   if msan:
 115     msan_options = symbolization_options[:]
 116     if lsan:
 117       msan_options.append('detect_leaks=1')
 118     extra_env['MSAN_OPTIONS'] = ' '.join(msan_options)
 119
 120   if tsan:
 121     tsan_options = symbolization_options[:]
 122     extra_env['TSAN_OPTIONS'] = ' '.join(tsan_options)
 123
 124   return extra_env
 125
 126
 127 def get_sanitizer_symbolize_command(json_path=None):
 128   """Construct the command to invoke offline symbolization script."""
 129   script_path = '../tools/valgrind/asan/asan_symbolize.py'
 130   cmd = [sys.executable, script_path]
 131   if json_path is not None:
 132     cmd.append('--test-summary-json-file=%s' % json_path)
 133   return cmd
 134
 135
 136 def get_json_path(cmd):
 137   """Extract the JSON test summary path from a command line."""
 138   json_path_flag = '--test-launcher-summary-output='
 139   for arg in cmd:
 140     if arg.startswith(json_path_flag):
 141       return arg.split(json_path_flag).pop()
 142   return None
 143
 144
 145 def symbolize_snippets_in_json(cmd, env):
 146   """Symbolize output snippets inside the JSON test summary."""
 147   json_path = get_json_path(cmd)
 148   if json_path is None:
 149     return
 150
 151   try:
 152     symbolize_command = get_sanitizer_symbolize_command(json_path=json_path)
 153     p = subprocess.Popen(symbolize_command, stderr=subprocess.PIPE, env=env)
 154     (_, stderr) = p.communicate()
 155   except OSError as e:
 156       print 'Exception while symbolizing snippets: %s' % e
 157
 158   if p.returncode != 0:
 159     print "Error: failed to symbolize snippets in JSON:\n"
 160     print stderr
 161
 162
 163 def run_executable(cmd, env):
 164   """Runs an executable with:
 165     - environment variable CR_SOURCE_ROOT set to the root directory.
 166     - environment variable LANGUAGE to en_US.UTF-8.
 167     - environment variable CHROME_DEVEL_SANDBOX set
 168     - Reuses sys.executable automatically.
 169   """
 170   extra_env = {}
 171   # Many tests assume a English interface...
 172   extra_env['LANG'] = 'en_US.UTF-8'
 173   # Used by base/base_paths_linux.cc as an override. Just make sure the default
 174   # logic is used.
 175   env.pop('CR_SOURCE_ROOT', None)
 176   extra_env.update(get_sandbox_env(env))
 177
 178   # Copy logic from  tools/build/scripts/slave/runtest.py.
 179   asan = '--asan=1' in cmd
 180   lsan = '--lsan=1' in cmd
 181   msan = '--msan=1' in cmd
 182   tsan = '--tsan=1' in cmd
 183   use_symbolization_script = (asan or msan) and not lsan
 184
 185   if asan or lsan or msan or tsan:
 186     extra_env.update(get_sanitizer_env(cmd, asan, lsan, msan, tsan))
 187
 188   if lsan or tsan:
 189     # LSan and TSan are not sandbox-friendly.
 190     cmd.append('--no-sandbox')
 191
 192   cmd = trim_cmd(cmd)
 193
 194   # Ensure paths are correctly separated on windows.
 195   cmd[0] = cmd[0].replace('/', os.path.sep)
 196   cmd = fix_python_path(cmd)
 197
 198   print('Additional test environment:\n%s\n'
 199         'Command: %s\n' % (
 200         '\n'.join('    %s=%s' %
 201             (k, v) for k, v in sorted(extra_env.iteritems())),
 202         ' '.join(cmd)))
 203   env.update(extra_env or {})
 204   try:
 205     # See above comment regarding offline symbolization.
 206     if use_symbolization_script:
 207       # Need to pipe to the symbolizer script.
 208       p1 = subprocess.Popen(cmd, env=env, stdout=subprocess.PIPE,
 209                             stderr=sys.stdout)
 210       p2 = subprocess.Popen(get_sanitizer_symbolize_command(),
 211                             env=env, stdin=p1.stdout)
 212       p1.stdout.close()  # Allow p1 to receive a SIGPIPE if p2 exits.
 213       p1.wait()
 214       p2.wait()
 215       # Also feed the out-of-band JSON output to the symbolizer script.
 216       symbolize_snippets_in_json(cmd, env)
 217       return p1.returncode
 218     else:
 219       return subprocess.call(cmd, env=env)
 220   except OSError:
 221     print >> sys.stderr, 'Failed to start %s' % cmd
 222     raise
 223
 224
 225 def main():
 226   return run_executable(sys.argv[1:], os.environ.copy())
 227
 228
 229 if __name__ == '__main__':
 230   sys.exit(main())