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[Flavio Percoco <1537626@xxxxxxxxxxxxxxxxxx>]

** Also affects: glance/liberty
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1537626

Title:
  `glance location-update` deletes locations and backend images

Status in Glance:
  In Progress
Status in Glance liberty series:
  New
Status in python-glanceclient:
  In Progress

Bug description:
  Hi all,

  I am having trouble using `glance location-update --url <current_url>
  --metadata <new_metadata>` to update the metadata of a location. When
  I try run the command, the locations become a blank list and the image
  is deleted from my backend (swift+https). I have traced it down to the
  following:

  When doing a location-update, glanceclient actually sends two patch
  commands:

  [{'op': 'replace', 'path': '/locations', 'value': []},
   {'op': 'replace',
    'path': '/locations',
    'value': [{u'metadata': {u'key': 'value'},
  {u'url': u'swift+https://image1'}]}]

  This is due to a note in python-
  glanceclient/glanceclient/v2/images.py, update_location():

          # NOTE: The server (as of now) doesn't support modifying individual
          # location entries. So we must:
          #   1. Empty existing list of locations.
          #   2. Send another request to set 'locations' to the new list
          #      of locations.

  However, at the server end, the _do_replace_locations() function which
  handles this call, actually deletes the locations and images when it
  gets the first call with the empty values
  (glance/glance/api/v2/images.py) ???

      def _do_replace_locations(self, image, value):
          if len(image.locations) > 0 and len(value) > 0:
              msg = _("Cannot replace locations from a non-empty "
                      "list to a non-empty list.")
              raise webob.exc.HTTPBadRequest(explanation=msg)
          if len(value) == 0:
              # NOTE(zhiyan): this actually deletes the location
              # from the backend store.
              del image.locations[:]
              if image.status == 'active':
                  image.status = 'queued'

  This seems to result in the first call deleting all the locations from
  the backend store, and the second call throwing an error because there
  is no location any more.

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