Provide a default for OPENSTACK_IMAGE_BACKEND

[Julie Pichon]

The new OPENSTACK_IMAGE_BACKEND is defined in local_settings.py.example, which can cause confusion for users (such as people upgrading) who suddenly find the Format drop-down empty and cannot create new images.

I thin we should have a reasonable default defined elsewhere, e.g. in settings.py which can then be overridden as needed in the local_settings.py.

OPENSTACK_IMAGE_BACKEND = {
    'image_formats': [
        ('', ''),
        ('aki', _('AKI - Amazon Kernel Image')),
        ('ami', _('AMI - Amazon Machine Image')),
        ('ari', _('ARI - Amazon Ramdisk Image')),
        ('iso', _('ISO - Optical Disk Image')),
        ('qcow2', _('QCOW2 - QEMU Emulator')),
        ('raw', _('Raw')),
        ('vdi', _('VDI')),
        ('vhd', _('VHD')),
        ('vmdk', _('VMDK'))
    ]
}

It's more surprising to the user than the new SECURITY_GROUP_RULES setting, since this is something that used to work but now doesn't.

[Julie Pichon (jpichon)]

See also bug 1223317 for the related puppet-horizon bug (this problem was initially reported by users who deployed using the puppet module, which uses its own copy of local_settings.py at deployment time).

[Akihiro Motoki (amotoki)]

Agree. It is better to have the default settings in a separate file from local_settings.py.

@jpich
Are you working on it? It is already targeted to Havana RC1.

[Julie Pichon (jpichon)]

Yes, I will submit a patch.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/46045

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/46045
Committed: http://github.com/openstack/horizon/commit/4609c7a9c265c1d413e5f369a5b32368d7e19a3d
Submitter: Jenkins
Branch: master

commit 4609c7a9c265c1d413e5f369a5b32368d7e19a3d
Author: Julie Pichon <email address hidden>
Date: Wed Sep 11 11:09:42 2013 +0100

    Provide a default for OPENSTACK_IMAGE_BACKEND

    The list of image formats has become customisable, but didn't have a
    default which can cause issues since it's a required field when
    creating a new image. Also document the setting.

    Additionally, mark OpenStack settings documentation as "(Partial)"
    until #1221115 is closed.

    Change-Id: I980c2d61bc9f9ac14fa39e5088c2ce03c48499b2
    Closes-Bug: #1223427