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[Andreas Hasenack <andreas@xxxxxxxxxxxxx>]

I did the same deployment with the local provider, on my trusty host,
and the precise container allowed that python snipped to be executed as
a regular user without problems.

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https://bugs.launchpad.net/bugs/1353734

Title:
  Permission denied when creating semaphore in container

Status in “lxc” package in Ubuntu:
  New

Bug description:
  Deployed a precise host on canonistack, then a precise container inside that host:
  andreas@nsn7:~$ juju status
  environment: andreas-canonistack2
  machines:
    "0":
      agent-state: started
      agent-version: 1.20.3
      dns-name: 10.55.32.177
      instance-id: b898eee8-9aef-4e6c-9749-dce73f490dc6
      instance-state: ACTIVE
      series: precise
      containers:
        0/lxc/0:
          agent-state: started
          agent-version: 1.20.3
          dns-name: 10.0.3.118
          instance-id: juju-machine-0-lxc-0
          series: precise
          hardware: arch=amd64
      hardware: arch=amd64 cpu-cores=1 mem=1024M root-disk=10240M
      state-server-member-status: has-vote
  services:
    ubuntu-precise:
      charm: cs:precise/ubuntu-4
      exposed: false
      units:
        ubuntu-precise/0:
          agent-state: started
          agent-version: 1.20.3
          machine: 0/lxc/0
          public-address: 10.0.3.118

  
  Test script:

  andreas@nsn7:~$ juju ssh ubuntu-precise/0 'python -c "from multiprocessing import synchronize; synchronize.Lock()"'
  Warning: Permanently added '10.55.32.177' (ECDSA) to the list of known hosts.
  Warning: Permanently added '10.0.3.118' (ECDSA) to the list of known hosts.
  Traceback (most recent call last):
    File "<string>", line 1, in <module>
    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 13] Permission denied
  Connection to 10.0.3.118 closed.
  ERROR subprocess encountered error code 1

  
  On the precise host:
  root@juju-andreas-canonistack2-machine-0:~# ls -la /dev/shm
  lrwxrwxrwx 1 root root 8 Aug  6 21:51 /dev/shm -> /run/shm

  root@juju-andreas-canonistack2-machine-0:~# grep shm /proc/mounts 
  none /run/shm tmpfs rw,nosuid,nodev,relatime 0 0

  root@juju-andreas-canonistack2-machine-0:~# dpkg-query -W sysvinit-utils lxc
  lxc	1.0.0~alpha1-0ubuntu14.1~ctools0
  sysvinit-utils	2.88dsf-13.10ubuntu11.1

  
  On the precise container:
  root@juju-machine-0-lxc-0:~# ls -la /dev/shm
  total 8
  drwxr-xr-x 2 root root 4096 Jul 17 07:05 .
  drwxr-xr-x 6 root root 4096 Aug  6 22:19 ..

  root@juju-machine-0-lxc-0:~# grep shm /proc/mounts 
  none /run/shm tmpfs rw,nosuid,nodev,relatime 0 0
  root@juju-machine-0-lxc-0:~# 

  Both are precise 12.04.5. The host was image b898eee8-9aef-
  4e6c-9749-dce73f490dc6 from canonistack's lcy02 region.

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