TestNamespace::test_uts_namespace fails when run via tox

[mgorny]

Full log: py38.log

Apparently socket.getfqdn() != socket.gethostname() (the latter returns host as expected). According to docs, it's trying to do some resolver magic, so it might be that.

=================================== FAILURES ===================================
_______________________ TestNamespace.test_uts_namespace _______________________

self = <test_contexts.TestNamespace object at 0x7f993b1840d0>

    @pytest.mark.skipif(not (os.path.exists('/proc/self/ns/user') and os.path.exists('/proc/self/ns/uts')),
                        reason='user and uts namespace support required')
    def test_uts_namespace(self):
        try:
            with Namespace(user=True, uts=True, hostname='host') as ns:
>               ns_hostname, _, ns_domainname = socket.getfqdn().partition('.')

tests/module/test_contexts.py:127: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <test_contexts.TestNamespace object at 0x7f993b1840d0>

    @pytest.mark.skipif(not (os.path.exists('/proc/self/ns/user') and os.path.exists('/proc/self/ns/uts')),
                        reason='user and uts namespace support required')
    def test_uts_namespace(self):
        try:
            with Namespace(user=True, uts=True, hostname='host') as ns:
>               ns_hostname, _, ns_domainname = socket.getfqdn().partition('.')

tests/module/test_contexts.py:127: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <snakeoil.contexts.Namespace object at 0x7f993b171850>
frame = <frame at 0x563be90e7f00, file '/home/mgorny/git/snakeoil/tests/module/test_contexts.py', line 131, code test_uts_namespace>
event = 'line', arg = None

    def __invoke_trace_funcs(self, frame, event, arg):
        """Invoke all trace funcs that have been injected.
    
        Once the injected functions have been executed all trace hooks are
        removed in order to minimize overhead.
        """
        try:
            for func in self.__injected_trace_funcs[frame]:
>               func(frame, event, arg)

.tox/py38/lib/python3.8/site-packages/snakeoil/contexts.py:237: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <snakeoil.contexts.Namespace object at 0x7f993b171850>
frame = <frame at 0x563be90e7f00, file '/home/mgorny/git/snakeoil/tests/module/test_contexts.py', line 131, code test_uts_namespace>
event = 'line', arg = None

    def __exit_context(self, frame, event, arg):
        """Simple function to throw a ParentException."""
>       raise self.ParentException()
E       snakeoil.contexts.SplitExec.ParentException

.tox/py38/lib/python3.8/site-packages/snakeoil/contexts.py:212: ParentException

During handling of the above exception, another exception occurred:

self = <test_contexts.TestNamespace object at 0x7f993b1840d0>

    @pytest.mark.skipif(not (os.path.exists('/proc/self/ns/user') and os.path.exists('/proc/self/ns/uts')),
                        reason='user and uts namespace support required')
    def test_uts_namespace(self):
        try:
            with Namespace(user=True, uts=True, hostname='host') as ns:
                ns_hostname, _, ns_domainname = socket.getfqdn().partition('.')
                assert ns_hostname == 'host'
>               assert ns_domainname == ''

tests/module/test_contexts.py:129: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <snakeoil.contexts.Namespace object at 0x7f993b171850>
exc_type = <class 'snakeoil.contexts.SplitExec.ParentException'>
exc_value = ParentException()
exc_traceback = <traceback object at 0x7f993b174ac0>

    def __exit__(self, exc_type, exc_value, exc_traceback):
        if self.childpid is not None:
            # make sure system tracing function is reset
            self.__revert_tracing(inspect.currentframe())
            # re-raise unknown exceptions from the parent
            if exc_type is not self.ParentException:
                raise exc_value
    
            # get exception from the child
            try:
                exc = self.__pipe.recv()
                self.locals = exc._locals
            except EOFError as e:
                exc = SystemExit(e)
    
            # handle child exiting abnormally
            if not isinstance(exc, SystemExit):
                os.waitpid(self.childpid, 0)
                self._exception_cleanup()
                sys.excepthook = self.__excepthook
>               raise exc
E               AssertionError: assert 'pomiot' == 'host'
E                 - host
E                 + pomiot

.tox/py38/lib/python3.8/site-packages/snakeoil/contexts.py:163: AssertionError
__________________ TestNamespaceDecorator.test_uts_namespace ___________________

args = (), kwargs = {}

    @wraps(func)
    def wrapper(*args, **kwargs):
        with Namespace(**namespaces):
>           return func(*args, **kwargs)

.tox/py38/lib/python3.8/site-packages/snakeoil/decorators.py:23: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

args = (), kwargs = {}

    @wraps(func)
    def wrapper(*args, **kwargs):
        with Namespace(**namespaces):
>           return func(*args, **kwargs)

.tox/py38/lib/python3.8/site-packages/snakeoil/decorators.py:23: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <snakeoil.contexts.Namespace object at 0x7f993b1cac70>
frame = <frame at 0x7f993b0f7420, file '/home/mgorny/git/snakeoil/.tox/py38/lib/python3.8/site-packages/snakeoil/decorators.py', line 23, code wrapper>
event = 'line', arg = None

    def __invoke_trace_funcs(self, frame, event, arg):
        """Invoke all trace funcs that have been injected.
    
        Once the injected functions have been executed all trace hooks are
        removed in order to minimize overhead.
        """
        try:
            for func in self.__injected_trace_funcs[frame]:
>               func(frame, event, arg)

.tox/py38/lib/python3.8/site-packages/snakeoil/contexts.py:237: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <snakeoil.contexts.Namespace object at 0x7f993b1cac70>
frame = <frame at 0x7f993b0f7420, file '/home/mgorny/git/snakeoil/.tox/py38/lib/python3.8/site-packages/snakeoil/decorators.py', line 23, code wrapper>
event = 'line', arg = None

    def __exit_context(self, frame, event, arg):
        """Simple function to throw a ParentException."""
>       raise self.ParentException()
E       snakeoil.contexts.SplitExec.ParentException

.tox/py38/lib/python3.8/site-packages/snakeoil/contexts.py:212: ParentException

During handling of the above exception, another exception occurred:

self = <test_decorators.TestNamespaceDecorator object at 0x7f993b1603a0>

    @pytest.mark.skipif(not (os.path.exists('/proc/self/ns/user') and os.path.exists('/proc/self/ns/uts')),
                        reason='user and uts namespace support required')
    def test_uts_namespace(self):
        @namespace(user=True, uts=True, hostname='host')
        def do_test():
            ns_hostname, _, ns_domainname = socket.getfqdn().partition('.')
            assert ns_hostname == 'host'
            assert ns_domainname == ''
    
        try:
>           do_test()

tests/module/test_decorators.py:47: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
.tox/py38/lib/python3.8/site-packages/snakeoil/decorators.py:23: in wrapper
    return func(*args, **kwargs)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <snakeoil.contexts.Namespace object at 0x7f993b1cac70>
exc_type = <class 'snakeoil.contexts.SplitExec.ParentException'>
exc_value = ParentException()
exc_traceback = <traceback object at 0x7f993b10dc80>

    def __exit__(self, exc_type, exc_value, exc_traceback):
        if self.childpid is not None:
            # make sure system tracing function is reset
            self.__revert_tracing(inspect.currentframe())
            # re-raise unknown exceptions from the parent
            if exc_type is not self.ParentException:
                raise exc_value
    
            # get exception from the child
            try:
                exc = self.__pipe.recv()
                self.locals = exc._locals
            except EOFError as e:
                exc = SystemExit(e)
    
            # handle child exiting abnormally
            if not isinstance(exc, SystemExit):
                os.waitpid(self.childpid, 0)
                self._exception_cleanup()
                sys.excepthook = self.__excepthook
>               raise exc
E               AssertionError: assert 'pomiot' == 'host'
E                 - host
E                 + pomiot

.tox/py38/lib/python3.8/site-packages/snakeoil/contexts.py:163: AssertionError
=========================== short test summary info ============================
FAILED tests/module/test_contexts.py::TestNamespace::test_uts_namespace - Ass...
FAILED tests/module/test_decorators.py::TestNamespaceDecorator::test_uts_namespace
================== 2 failed, 522 passed, 50 skipped in 28.96s ==================
ERROR: InvocationError for command /home/mgorny/git/snakeoil/.tox/py38/bin/coverage run -p -m pytest -v (exited with code 1)
___________________________________ summary ____________________________________
ERROR:   py38: commands failed