[Bug 1570356] Re: unable to load plugins in Centos

[Juan Antonio Osorio Robles]

Thanks Brian!

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https://bugs.launchpad.net/bugs/1570356

Title:
  unable to load plugins in Centos

Status in Barbican:
  Fix Released
Status in barbican package in Ubuntu:
  Fix Released
Status in barbican source package in Xenial:
  Fix Committed

Bug description:
  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.

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