self = <_pytest.tmpdir.TempdirFactory object at 0x7f23a5fc6b00>

    def getbasetemp(self):
        """ return base temporary directory. """
        try:
>           return self._basetemp
E           AttributeError: 'TempdirFactory' object has no attribute '_basetemp'

/usr/local/lib/python3.6/site-packages/_pytest/tmpdir.py:48: AttributeError

During handling of the above exception, another exception occurred:

self = <module 'py.error'>, func = <function rmtree at 0x7f23abf71378>, args = ('/src/buildstream/tmp',)
kwargs = {'ignore_errors': False}, __tracebackhide__ = False, cls = <class 'py.error.EISDIR'>
value = IsADirectoryError(21, 'Is a directory'), tb = <traceback object at 0x7f238c2405c8>, errno = 21

    def checked_call(self, func, *args, **kwargs):
        """ call a function and raise an errno-exception if applicable. """
        __tracebackhide__ = True
        try:
>           return func(*args, **kwargs)

/usr/local/lib/python3.6/site-packages/py/_error.py:66:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

path = '/src/buildstream/tmp', ignore_errors = False
onerror = <function rmtree.<locals>.onerror at 0x7f238ca447b8>

    def rmtree(path, ignore_errors=False, onerror=None):
        """Recursively delete a directory tree.

        If ignore_errors is set, errors are ignored; otherwise, if onerror
        is set, it is called to handle the error with arguments (func,
        path, exc_info) where func is platform and implementation dependent;
        path is the argument to that function that caused it to fail; and
        exc_info is a tuple returned by sys.exc_info().  If ignore_errors
        is false and onerror is None, an exception is raised.

        """
        if ignore_errors:
            def onerror(*args):
                pass
        elif onerror is None:
            def onerror(*args):
                raise
        if _use_fd_functions:
            # While the unsafe rmtree works fine on bytes, the fd based does not.
            if isinstance(path, bytes):
                path = os.fsdecode(path)
            # Note: To guard against symlink races, we use the standard
            # lstat()/open()/fstat() trick.
            try:
                orig_st = os.lstat(path)
            except Exception:
                onerror(os.lstat, path, sys.exc_info())
                return
            try:
                fd = os.open(path, os.O_RDONLY)
            except Exception:
                onerror(os.lstat, path, sys.exc_info())
                return
            try:
                if os.path.samestat(orig_st, os.fstat(fd)):
>                   _rmtree_safe_fd(fd, path, onerror)