multiprocessing.queues.Queue does not work in pbuilder?

[Ole Streicher <olebole@debian.org>]

Hi,

I am trying to get the release candidate for python-astropy
packaged. The packaging includes a number of tests, where many fail in
pbuilder, which can be traced back to:

$ sudo pbuilder login
# apt-get install python
# python
Python 2.7.9 (default, Dec 11 2014, 08:58:12) 
[GCC 4.9.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from multiprocessing.queues import Queue
>>> q = Queue(8)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/multiprocessing/queues.py", line 63, in __init__
    self._rlock = Lock()
  File "/usr/lib/python2.7/multiprocessing/synchronize.py", line 147, in __init__
    SemLock.__init__(self, SEMAPHORE, 1, 1)
  File "/usr/lib/python2.7/multiprocessing/synchronize.py", line 75, in __init__
    sl = self._semlock = _multiprocessing.SemLock(kind, value, maxvalue)
OSError: [Errno 38] Function not implemented

The cause for this seems to be that /run/user is not mounted; if I mount
manually, it works fine:

# mkdir /run/user
# mount none /run/user -t tmpfs
# python
Python 2.7.9 (default, Dec 11 2014, 08:58:12) 
[GCC 4.9.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from multiprocessing.queues import Queue
>>> q = Queue(8)
>>> 

However, how can/should I do this in debian/rules?

Best

Ole