[Bug 1570356] [NEW] unable to load plugins in Centos

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You have been subscribed to a public bug by Ubuntu Foundations Team Bug Bot (crichton):

The certificate_manager module in barbican/plugins/interface creates an
instance of _CertificateEventPluginManager whithin that same module. the
_CertificateEventPluginManager in turn, imports the plugins, which
import the certificate_manager module itself. So in Centos we see that
this causes an error when trying to import the modules:

Apr 11 15:33:31 centos-7-ovh-gra1-54094 gunicorn[25012]: cannot import name certificate_manager
Apr 11 15:33:31 centos-7-ovh-gra1-54094 gunicorn[25012]: Traceback (most recent call last):
Apr 11 15:33:31 centos-7-ovh-gra1-54094 gunicorn[25012]: File "/usr/lib/python2.7/site-packages/stevedore/extension.py", line 163, in _load_plugins
Apr 11 15:33:31 centos-7-ovh-gra1-54094 gunicorn[25012]: verify_requirements,
Apr 11 15:33:31 centos-7-ovh-gra1-54094 gunicorn[25012]: File "/usr/lib/python2.7/site-packages/stevedore/named.py", line 123, in _load_one_plugin
Apr 11 15:33:31 centos-7-ovh-gra1-54094 gunicorn[25012]: verify_requirements,
Apr 11 15:33:31 centos-7-ovh-gra1-54094 gunicorn[25012]: File "/usr/lib/python2.7/site-packages/stevedore/extension.py", line 184, in _load_one_plugin
Apr 11 15:33:31 centos-7-ovh-gra1-54094 gunicorn[25012]: plugin = ep.resolve()
Apr 11 15:33:31 centos-7-ovh-gra1-54094 gunicorn[25012]: File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2208, in resolve
Apr 11 15:33:31 centos-7-ovh-gra1-54094 gunicorn[25012]: module = __import__(self.module_name, fromlist=['__name__'], level=0)
Apr 11 15:33:31 centos-7-ovh-gra1-54094 gunicorn[25012]: File "/usr/lib/python2.7/site-packages/barbican/plugin/simple_certificate_manager.py", line 19, in <module>
Apr 11 15:33:31 centos-7-ovh-gra1-54094 gunicorn[25012]: from barbican.plugin.interface import certificate_manager as cert
Apr 11 15:33:31 centos-7-ovh-gra1-54094 gunicorn[25012]: ImportError: cannot import name certificate_manager

This is due to the circular dependency I mentioned above.

** Affects: barbican
     Importance: Undecided
         Status: Fix Released

** Affects: barbican (Ubuntu)
     Importance: High
         Status: Triaged


** Tags: in-stable-mitaka patch
-- 
unable to load plugins in Centos
https://bugs.launchpad.net/bugs/1570356
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