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[Brian Rosmaita <rosmaita.fossdev@xxxxxxxxx>]

This is not a valid glance bug.  Once the image data is set, no one is
allowed to change the disk_format, container_format, size, or checksum.
This is by design.  It is particularly the case for snapshots, where
Nova knows exactly what it is dealing with and will set the disk_format
and container_format correctly.

Additionally, it is possible to change the disk_format and
container_format on images in 'queued' status using the Image API.

** Changed in: glance
       Status: In Progress => Invalid

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https://bugs.launchpad.net/bugs/1772232

Title:
  User gets logged out when editing a snapshot

Status in Glance:
  Invalid
Status in OpenStack Dashboard (Horizon):
  New

Bug description:
  Procedure:
  1- Go Project -> Compute -> Instances.
  2- Create a snapshot of any instance.
  3- Go to the newly created snapshot raw in Project -> Compute -> Images.
  4- Edit Image -> change disk format to another format, e.g, "ISO".
  5- The user logs out directly.

  Note: Even admin user faces the same issue.

  After analyzing the issue, I found that a "Forbidden HTTP request
  (403)" is thrown if any user tries to edit the "disk format" attribute
  if the image is not in "queued" status even though queued images
  cannot be edited. And that, in turn, logs user out.

  Editing disk format of any image won't really change its format. So,
  it might be true to have an error message when editing disk format
  attribute. If the case of Forbidden HTTP request is not correct, we
  can throw any other exception indicating that the content cannot be
  changed.

  I have the version 3.15.0 of openstack.

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