Use of _ without importing it - "NameError: name '_' is not defined"

[Wlodzimierz Borkowski]

To reproduce start main function in glance/glance/cmd/api.py or glance/glance/cmd/registry.py.
There is exception in devstack:

File "/opt/stack/glance/glance/cmd/api.py", line 28, in <module>
    from glance.common import utils
  File "/opt/stack/glance/glance/common/utils.py", line 45, in <module>
    from glance.common import exception
  File "/opt/stack/glance/glance/common/exception.py", line 30, in <module>
    class GlanceException(Exception):
  File "/opt/stack/glance/glance/common/exception.py", line 38, in GlanceException
    message = _("An unknown exception occurred")
NameError: name '_' is not defined

Process finished with exit code 1

Seems to be similar to bug #885529

I think one of the possible solution (which works for me) is to put in glance/glance/__init__.py lines below:

from glance.openstack.common import gettextutils
gettextutils.install('glance')

Check with glance:2015.1

[Dolph Mathews (dolph)]

Keystone had ongoing issues similar to this, and ultimately moved away from importing gettextutils via entry points (as you're suggesting is the fix here, and will probably work in this one case) to instead do explicit imports into every module where gettextutils is used, which has been much more reliable.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/128657

[OpenStack Infra (hudson-openstack)]

Change abandoned by Roman Vasilets (<email address hidden>) on branch: master
Review: https://review.openstack.org/128657

[Ian Cordasco (icordasc)]

Roman abandoned their change so I moved this back to triaged and unassigned them. If you wish to pick this up, please assign yourself. Roman, if you intend to continue working on this re-assign yourself please.