"""Test to ensure we're not touching /dev/ptmx when running commands."""
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from __future__ import print_function
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import os
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import subprocess
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import tempfile
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import time
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import unittest
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from cros_utils import command_executer
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class NoPsuedoTerminalTest(unittest.TestCase):
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"""Test to ensure we're not touching /dev/ptmx when running commands."""
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_strace_process = None
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STRACE_TIMEOUT = 10
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def _AttachStraceToSelf(self, output_file):
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"""Attaches strace to the current process."""
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args = ['strace', '-o', output_file, '-p', str(os.getpid())]
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print(args)
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self._strace_process = subprocess.Popen(args)
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# Wait until we see some activity.
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start_time = time.time()
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while time.time() - start_time < self.STRACE_TIMEOUT:
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if os.path.isfile(output_file) and open(output_file).read(1):
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return True
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time.sleep(1)
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return False
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def _KillStraceProcess(self):
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"""Kills strace that was started by _AttachStraceToSelf()."""
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self._strace_process.terminate()
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self._strace_process.wait()
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return True
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def testNoPseudoTerminalWhenRunningCommand(self):
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"""Test to make sure we're not touching /dev/ptmx when running commands."""
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temp_file = tempfile.mktemp()
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self.assertTrue(self._AttachStraceToSelf(temp_file))
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ce = command_executer.GetCommandExecuter()
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ce.RunCommand('echo')
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self.assertTrue(self._KillStraceProcess())
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strace_contents = open(temp_file).read()
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self.assertFalse('/dev/ptmx' in strace_contents)
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if __name__ == '__main__':
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unittest.main()
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