Flaky daemonize test

[fmoo]

test_daemon.py is failing sporadically on my linux desktop:

===================================================================================================== FAILURES ======================================================================================================
___________________________________________________________________________________________ SimpleTestCase.test_daemonize ___________________________________________________________________________________________

self = <tests.test_daemon.SimpleTestCase testMethod=test_daemonize>

    def test_daemonize(self):
        if not HAS_DAEMONIZE:
            raise Skip("need `daemonize` for this test case")

        def daemon_helper():
            time.sleep(100)
            self.fail()

        with NamedTemporaryFile() as tf:
            # Fork so daemonizing the current process does not mess up with the
            # test suite.
            child_pid = os.fork()
            if child_pid == 0:
                try:
                    daemon.daemonize(daemon_helper, name='sparts_unittest',
                                     pidfile=tf.name, logger=self.logger)
                except SystemExit:
                    # Catch the daemonize library's attempt to sys.exit()
                    pass
            else:

                def checkdaemon():
                    try:
                        return daemon.status(tf.name, self.logger)
                    except ValueError:
                        return False

                # Eliminate the race condition waiting for
                # daemonize.Daemonize() to create *and* write the pid to the
                # pidfile.
                timer.run_until_true(checkdaemon, timeout=1.0)

                self.assertTrue(daemon.status(tf.name, self.logger))
>               self.assertTrue(daemon.kill(tf.name, self.logger))

tests/test_daemon.py:92: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
/usr/lib/python2.7/tempfile.py:427: in __exit__
    self.close()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <closed file '<fdopen>', mode 'w+b' at 0x7f03d84dfed0>

    def close(self):
        if not self.close_called:
            self.close_called = True
            self.file.close()
            if self.delete:
>               self.unlink(self.name)
E               OSError: [Errno 2] No such file or directory: '/tmp/tmpRNzIO8'

/usr/lib/python2.7/tempfile.py:418: OSError
----------------------------------------------------------------------------------------------- Captured stderr call ------------------------------------------------------------------------------------------------
DEBUG:TestService:All tasks started
DEBUG:TestService:VService Active.  Awaiting graceful shutdown.
============================================================================================== short test summary info ==============================================================================================
FAIL tests/test_daemon.py::SimpleTestCase::test_daemonize
SKIP [1] /home/pete/src/sparts/tests/test_fb303.py:13: Skip: thrift is required to run this test
SKIP [1] /home/pete/src/sparts/tests/thrift/test_compiler.py:12: Skip: Unable to find thrift binary on this system
SKIP [1] /home/pete/src/sparts/tests/thrift/test_client.py:11: Skip: Need thrift language bindings to run this test
SKIP [1] /home/pete/src/sparts/tests/tasks/thrift/test_multiplexed.py:18: Skip: Need thrift language bindings to run this test
SKIP [1] /home/pete/src/sparts/tests/tasks/test_thrift.py:15: Skip: Need thrift language bindings to run this test
============================================================================ 1 failed, 70 passed, 5 skipped, 2 warnings in 4.91 seconds =============================================================================