[Bug 1633576] Re: neutron-db-manage fails when old migrations are present

[James Page]

"packages are additive so system had migrations for 'havana' in
/usr/lib/python2.7/dist-packages/neutron/db/migration/alembic_migrations
but current neutron-db-manage doesn't know about 'havana' so freaks
out."

packages should not additive - if a file does not exist in the newer
version of python-neutron, it should be removed on upgrade so I'm a bit
baffled as to why you see this behaviour.

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https://bugs.launchpad.net/bugs/1633576

Title:
  neutron-db-manage fails when old migrations are present

Status in neutron:
  Invalid
Status in neutron package in Ubuntu:
  New

Bug description:
  Ubuntu 14.04 using cloud-archive packages upgrading from kilo to liberty
  python-neutron:
    Installed: 2:8.2.0-0ubuntu1~cloud0
    500 http://ubuntu-cloud.archive.canonical.com/ubuntu/ trusty-updates/mitaka/main amd64 Packages

  neutron db migration error in prod kilo->liberty upgrade:

  # neutron-db-manage upgrade head

  /usr/lib/python2.7/dist-packages/alembic/util/messaging.py:69: UserWarning: Revision havana referenced from havana -> 1cbdb560f806 (head), empty message is not present
  <snip details at http://pastebin.com/D8Pdsvn9 >
  KeyError: 'havana'

  packages are additive so system had migrations for 'havana' in
  /usr/lib/python2.7/dist-
  packages/neutron/db/migration/alembic_migrations but current neutron-
  db-manage doesn't know about 'havana' so freaks out.

  solution: 
  rm -r /usr/lib/python2.7/dist-packages/neutron/db/migration/alembic_migrations
  apt-get install --reinstall python-neutron

  then migrations work as expected.

  I feel like this is a packaging bug and old migrations should be
  removed on upgrade.  I could also see this as an upstream bug where
  code should at least remember historic version names, but choosing to
  report here ...

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