non-unicode error message -> glance-reg dies without saying why

[James Polley]

My logs were full of:

Oct 20 11:21:35 undercloud-undercloud-uxtyfj4ag5qy glance-reg: 2014-10-20 11:21:35.199 34161 TRACE glance Traceback (most recent call last):
Oct 20 11:21:35 undercloud-undercloud-uxtyfj4ag5qy glance-reg: 2014-10-20 11:21:35.199 34161 TRACE glance File "/opt/stack/venvs/glance/bin/glance-registry", line 10, in <module>
Oct 20 11:21:35 undercloud-undercloud-uxtyfj4ag5qy glance-reg: 2014-10-20 11:21:35.199 34161 TRACE glance sys.exit(main())
Oct 20 11:21:35 undercloud-undercloud-uxtyfj4ag5qy glance-reg: 2014-10-20 11:21:35.199 34161 TRACE glance File "/opt/stack/venvs/glance/local/lib/python2.7/site-packages/glance/cmd/registry.py", line 74, in main
Oct 20 11:21:35 undercloud-undercloud-uxtyfj4ag5qy glance-reg: 2014-10-20 11:21:35.199 34161 TRACE glance sys.exit("ERROR: %s" % e)
Oct 20 11:21:35 undercloud-undercloud-uxtyfj4ag5qy glance-reg: 2014-10-20 11:21:35.199 34161 TRACE glance File "/opt/stack/venvs/glance/local/lib/python2.7/site-packages/oslo/i18n/_message.py", line 167, in __str__
Oct 20 11:21:35 undercloud-undercloud-uxtyfj4ag5qy glance-reg: 2014-10-20 11:21:35.199 34161 TRACE glance raise UnicodeError(msg)
Oct 20 11:21:35 undercloud-undercloud-uxtyfj4ag5qy glance-reg: 2014-10-20 11:21:35.199 34161 TRACE glance UnicodeError: Message objects do not support str() because they may contain non-ascii characters. Please use unicode() or translate() instead.
Oct 20 11:21:35 undercloud-undercloud-uxtyfj4ag5qy glance-reg: 2014-10-20 11:21:35.199 34161 TRACE glance

After this, init would restart glance-reg, ready for it to die again shortly afterwards.

The original error is swallowed by the error processing the first error message, and I can't tell what the original error was.

[James Polley (tchaypo)]

http://lists.openstack.org/pipermail/openstack-dev/2014-June/038857.html gave me a big hint about what was happening here.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/129579
Committed: https://git.openstack.org/cgit/openstack/glance/commit/?id=b52c7970a0e14a2be1526c2d6312e023272b3912
Submitter: Jenkins
Branch: master

commit b52c7970a0e14a2be1526c2d6312e023272b3912
Author: James Polley <email address hidden>
Date: Mon Oct 20 22:26:18 2014 +1100

    Use unicode for error message

    Prior to this change, glance-reg would encounter an error, then
    encounter an error reporting the first error. Glance-reg would end up
    dead with the only error message printed being about the fact that the
    first error message wasn't unicode.

    After this change, glance-reg still dies just as readily - but on the
    way down, it manages to emit the original error message. In my case,
    this means that I now know that the original fault is that it can't bind
    to 0.0.0.0:9191

    Change-Id: I0e90b538996f87fe100c973fdf1fb61791e4e660
    closes-bug: 1383255