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[Erno Kuvaja <jokke@xxxxxx>]

This bug is so old that if the issue still persists we should open new
one.

** Changed in: glance
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/1061722

Title:
  Regression in handling of 0 sized remote images

Status in OpenStack Image Registry and Delivery Service (Glance):
  Invalid

Bug description:
  It seems a problem exists around remote images added with a missing or
  0 size.

  Change I3093eba1 was added to HEAD the remote for the size in this
  case.  However, what about 0 size images added before this patch?

  Change I7656bc97 should handle these by grabbing the size from the
  cache.  Unfortunately Change I61e96f3f appears to effectively break
  the former as it sets images with a 0 size in the registry to an empty
  iterator, before it even reaches the cache:

  # simulate a remote image
  $ echo 'hello world' > foo
  $ { echo -ne "HTTP/1.0 200 OK\r\nContent-Length: $(wc -c <foo)\r\n\r\n"; cat foo; } | nc -l 8080

  # add it to glance
  $ curl -X POST -H "X-Image-Meta-Name:Image0" -H "X-Image-Meta-disk_format:raw" -H "X-Image-Meta-container_format:ovf" -H "X-Image-Meta-Is-Public:True" -H "X-Image-Meta-Location: http://localhost:8080"; http://localhost:9292/v1/images

  # simulate bug 900959 (i.e. a remote image added before the logic to fetch the size was introduced), by setting the size in the registry to 0
  $ sqlite3 -line /var/lib/glance/glance.sqlite "update images set size=0 where id='7c6fea6b-817b-48ba-af06-0f22bcc4e018';"

  # now try to download the image
  $ curl http://localhost:9292/v1/images/7c6fea6b-817b-48ba-af06-0f22bcc4e018
  # Nothing returned!

  # empty file placed in the cache
  $ ls -s /var/lib/glance/image-cache/7c6fea6b-817b-48ba-af06-0f22bcc4e018
  0 /var/lib/glance/image-cache/7c6fea6b-817b-48ba-af06-0f22bcc4e018

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