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[Ian Cordasco <icordasc+launchpad@xxxxxxxxxx>]

See https://review.openstack.org/#/c/161428/ for a simpler solution that
does not add boto as a requirement.

** Project changed: glance => glance-store

** Changed in: glance-store
     Assignee: Oleg Gashev (oleg-f) => Ian Cordasco (icordasc)

** Changed in: glance-store
    Milestone: None => v0.1.13

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https://bugs.launchpad.net/bugs/1426767

Title:
  Loading backend stores is not conditional and fails if optional
  dependencies are missing

Status in OpenStack Glance backend store-drivers library (glance_store):
  In Progress

Bug description:
  # pip list|grep glance
  glance (2015.1.dev40)
  glance-store (0.1.11)

  # /usr/bin/glance-api 
  2015-02-28 15:21:25.949 23107 ERROR stevedore.extension [-] Could not load 's3': No module named boto.exception
  2015-02-28 15:21:25.950 23107 ERROR stevedore.extension [-] No module named boto.exception
  2015-02-28 15:21:25.950 23107 TRACE stevedore.extension Traceback (most recent call last):
  2015-02-28 15:21:25.950 23107 TRACE stevedore.extension   File "/usr/lib/python2.7/site-packages/stevedore/extension.py", line 162, in _load_plugins
  2015-02-28 15:21:25.950 23107 TRACE stevedore.extension     verify_requirements,
  2015-02-28 15:21:25.950 23107 TRACE stevedore.extension   File "/usr/lib/python2.7/site-packages/stevedore/extension.py", line 185, in _load_one_plugin
  2015-02-28 15:21:25.950 23107 TRACE stevedore.extension     plugin = ep.load(require=verify_requirements)
  2015-02-28 15:21:25.950 23107 TRACE stevedore.extension   File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2025, in load
  2015-02-28 15:21:25.950 23107 TRACE stevedore.extension     entry = __import__(self.module_name, globals(),globals(), ['__name__'])
  2015-02-28 15:21:25.950 23107 TRACE stevedore.extension   File "/usr/lib/python2.7/site-packages/glance_store/_drivers/s3.py", line 26, in <module>
  2015-02-28 15:21:25.950 23107 TRACE stevedore.extension     import boto.exception
  2015-02-28 15:21:25.950 23107 TRACE stevedore.extension ImportError: No module named boto.exception
  2015-02-28 15:21:25.950 23107 TRACE stevedore.extension 
  2015-02-28 15:21:26.033 23107 ERROR stevedore.extension [-] Could not load 'glance.store.s3.Store': No module named boto.exception
  2015-02-28 15:21:26.034 23107 ERROR stevedore.extension [-] No module named boto.exception
  2015-02-28 15:21:26.034 23107 TRACE stevedore.extension Traceback (most recent call last):
  2015-02-28 15:21:26.034 23107 TRACE stevedore.extension   File "/usr/lib/python2.7/site-packages/stevedore/extension.py", line 162, in _load_plugins
  2015-02-28 15:21:26.034 23107 TRACE stevedore.extension     verify_requirements,
  2015-02-28 15:21:26.034 23107 TRACE stevedore.extension   File "/usr/lib/python2.7/site-packages/stevedore/extension.py", line 185, in _load_one_plugin
  2015-02-28 15:21:26.034 23107 TRACE stevedore.extension     plugin = ep.load(require=verify_requirements)
  2015-02-28 15:21:26.034 23107 TRACE stevedore.extension   File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2025, in load
  2015-02-28 15:21:26.034 23107 TRACE stevedore.extension     entry = __import__(self.module_name, globals(),globals(), ['__name__'])
  2015-02-28 15:21:26.034 23107 TRACE stevedore.extension   File "/usr/lib/python2.7/site-packages/glance_store/_drivers/s3.py", line 26, in <module>
  2015-02-28 15:21:26.034 23107 TRACE stevedore.extension     import boto.exception
  2015-02-28 15:21:26.034 23107 TRACE stevedore.extension ImportError: No module named boto.exception
  2015-02-28 15:21:26.034 23107 TRACE stevedore.extension

  boto does not exist to glance_store requirements.

  After boto installation, issue was fixed.

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