[Bug 1537130] Re: Glance depends on swift client

[Corey Bryant]

Looking at the upstream code for glance_store stable/liberty
(https://github.com/openstack/glance_store) there are optional
dependencies listed in setup.cfg [extras], which include swiftclient.
It looks like these need to be added to the package's debian/control
Suggests or Depends section for glance_store.  Typically we determine
package dependencies based on the upstream (test-)requirements.txt, so I
think this is a gap in where we're looking for upstream dependencies.

  55 [extras]
  56 # Dependencies for each of the optional stores
  57 s3 =
  58   boto>=2.32.1
  59 vmware =
  60   oslo.vmware>=1.16.0 # Apache-2.0
  61 swift =
  62   httplib2>=0.7.5
  63   python-swiftclient>=2.2.0,<3.0.0
  64 gridfs =
  65   pymongo>=3.0.2
  66 cinder =
  67   python-cinderclient>=1.3.1

** Changed in: glance (Ubuntu)
       Status: Confirmed => Triaged

** Changed in: glance (Ubuntu)
   Importance: Undecided => Medium

** Also affects: python-glance-store (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: python-glance-store (Ubuntu)
       Status: New => Triaged

** Changed in: python-glance-store (Ubuntu)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1537130

Title:
  Glance depends on swift client

Status in Glance:
  New
Status in glance package in Ubuntu:
  Triaged
Status in python-glance-store package in Ubuntu:
  Triaged

Bug description:
  Using the cloud archive repository for Liberty, the glance-api service
  (2:11.0.0-0ubuntu1~cloud0) appears to depend on the swift client
  regardless of whether or not the glance configuration uses the swift
  back-end.

  ERROR stevedore.extension [-] Could not load 'glance.store.swift.Store': No module named swiftclient
  ERROR stevedore.extension [-] No module named swiftclient
  ERROR stevedore.extension Traceback (most recent call last):
  ERROR stevedore.extension   File "/usr/lib/python2.7/dist-packages/stevedore/extension.py", line 162, in _load_plugins
  ERROR stevedore.extension     verify_requirements,
  ERROR stevedore.extension   File "/usr/lib/python2.7/dist-packages/stevedore/extension.py", line 183, in _load_one_plugin
  ERROR stevedore.extension     plugin = ep.resolve()
  ERROR stevedore.extension   File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2361, in resolve
  ERROR stevedore.extension     module = __import__(self.module_name, fromlist=['__name__'], level=0)
  ERROR stevedore.extension   File "/usr/lib/python2.7/dist-packages/glance_store/_drivers/swift/__init__.py", line 17, in <module>
  ERROR stevedore.extension     from glance_store._drivers.swift.store import *  # noqa
  ERROR stevedore.extension   File "/usr/lib/python2.7/dist-packages/glance_store/_drivers/swift/store.py", line 28, in <module>
  ERROR stevedore.extension     import swiftclient
  ERROR stevedore.extension ImportError: No module named swiftclient
  ERROR stevedore.extension
  ERROR stevedore.extension [-] Could not load 'swift': cannot import name utils
  ERROR stevedore.extension [-] cannot import name utils
  ERROR stevedore.extension Traceback (most recent call last):
  ERROR stevedore.extension   File "/usr/lib/python2.7/dist-packages/stevedore/extension.py", line 162, in _load_plugins
  ERROR stevedore.extension     verify_requirements,
  ERROR stevedore.extension   File "/usr/lib/python2.7/dist-packages/stevedore/extension.py", line 183, in _load_one_plugin
  ERROR stevedore.extension     plugin = ep.resolve()
  ERROR stevedore.extension   File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2361, in resolve
  ERROR stevedore.extension     module = __import__(self.module_name, fromlist=['__name__'], level=0)
  ERROR stevedore.extension   File "/usr/lib/python2.7/dist-packages/glance_store/_drivers/swift/__init__.py", line 16, in <module>
  ERROR stevedore.extension     from glance_store._drivers.swift import utils  # noqa
  ERROR stevedore.extension ImportError: cannot import name utils
  ERROR stevedore.extension

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