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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Copyright 2019 The ChromiumOS Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Test to ensure we're not touching /dev/ptmx when running commands."""
import os
import subprocess
import tempfile
import time
import unittest
from cros_utils import command_executer
class NoPsuedoTerminalTest(unittest.TestCase):
"""Test to ensure we're not touching /dev/ptmx when running commands."""
_strace_process = None
STRACE_TIMEOUT = 10
def _AttachStraceToSelf(self, output_file):
"""Attaches strace to the current process."""
args = ["sudo", "strace", "-o", output_file, "-p", str(os.getpid())]
print(args)
# pylint: disable=bad-option-value, subprocess-popen-preexec-fn
self._strace_process = subprocess.Popen(args, preexec_fn=os.setpgrp)
# Wait until we see some activity.
start_time = time.time()
while time.time() - start_time < self.STRACE_TIMEOUT:
if os.path.isfile(output_file) and open(output_file).read(1):
return True
time.sleep(1)
return False
def _KillStraceProcess(self):
"""Kills strace that was started by _AttachStraceToSelf()."""
pgid = os.getpgid(self._strace_process.pid)
args = ["sudo", "kill", str(pgid)]
if subprocess.call(args) == 0:
os.waitpid(pgid, 0)
return True
return False
def testNoPseudoTerminalWhenRunningCommand(self):
"""Test to make sure we're not touching /dev/ptmx when running commands."""
temp_file = tempfile.mktemp()
self.assertTrue(self._AttachStraceToSelf(temp_file))
ce = command_executer.GetCommandExecuter()
ce.RunCommand("echo")
self.assertTrue(self._KillStraceProcess())
strace_contents = open(temp_file).read()
self.assertFalse("/dev/ptmx" in strace_contents)
if __name__ == "__main__":
unittest.main()
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