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[David Wittman <1182624@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1183606 ***
    https://bugs.launchpad.net/bugs/1183606

** This bug has been marked a duplicate of bug 1183606
   qcow image support broken in stable/folsom nova compute

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https://bugs.launchpad.net/bugs/1182624

Title:
  Uncached instance builds fail with non-zero root disk sizes

Status in OpenStack Compute (Nova):
  Confirmed
Status in “nova” package in Ubuntu:
  Confirmed

Bug description:
  A recent change in the Folsom code has resulted in issues building new
  instances with a non-zero root disk size. It is currently trying to
  compare the flavor size to the size of the base image before the base
  image is actually pulled down. As a result, builds fail with the
  following error in nova-compute.log:

  2013-05-21 17:44:18 ERROR nova.compute.manager [req-a1b0cf46-aad0-48e4-8474-ea350de678d5 5dbf5c9e5c4740638fa563a942475b12 180d2f50f1384c65b456da82ed90429d] [instance: 67b18b5c-755a-4484-a75a-9ce3629eb0c5] Build error: ['Traceback (most recent call last):\n', '  File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 503, in _run_instance\n    injected_files, admin_password)\n', '  File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 756, in _spawn\n    block_device_info)\n', '
  File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 117, in wrapped\n    temp_level, payload)\n', '
  File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__\n    self.gen.next()\n', '
  File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 92, in wrapped\n    return f(*args, **kw)\n', '
  File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 1091, in spawn\n    admin_pass=admin_password)\n', '
  File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 1357, in _create_image\n    project_id=instance[\'project_id\'])\n', '
  File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/imagebackend.py", line 131, in cache\n    *args, **kwargs)\n', '
  File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/imagebackend.py", line 181, in create_image\n    if size and size < disk.get_disk_size(base):\n', '
  File "/usr/lib/python2.7/dist-packages/nova/virt/disk/api.py", line 115, in get_disk_size\n    size = images.qemu_img_info(path)[\'virtual size\']\n', '
  File "/usr/lib/python2.7/dist-packages/nova/virt/images.py", line 50, in qemu_img_info\n    \'qemu-img\', \'info\', path)\n', '
  File "/usr/lib/python2.7/dist-packages/nova/utils.py", line 210, in execute\n    cmd=\' \'.join(cmd))\n', 'ProcessExecutionError: Unexpected error while running command.\nCommand: env LC_ALL=C LANG=C qemu-img info /var/lib/nova/instances/_base/ef98e9c3ea74090467df43c56068756bae1b8a4e\nExit code: 1\nStdout: \'\'\nStderr: "qemu-img: Could not open \'/var/lib/nova/instances/_base/ef98e9c3ea74090467df43c56068756bae1b8a4e\': No such file or directory\\n"\n']

  System Info:
  # lsb_release -rd
  Description:    Ubuntu 12.04.2 LTS
  Release:        12.04

  # apt-cache policy nova-compute
  nova-compute:
    Installed: 2012.2.3-0ubuntu2.1~cloud0
    Candidate: 2012.2.3-0ubuntu2.1~cloud0
    Version table:
   *** 2012.2.3-0ubuntu2.1~cloud0 0
          500 http://ubuntu-cloud.archive.canonical.com/ubuntu/ precise-proposed/folsom/main amd64 Packages
          100 /var/lib/dpkg/status
       2012.1.3+stable-20130423-e52e6912-0ubuntu1.1 0
          500 http://mirror.rackspace.com/ubuntu/ precise-updates/main amd64 Packages
          500 http://security.ubuntu.com/ubuntu/ precise-security/main amd64 Packages
       2012.1-0ubuntu2 0
          500 http://mirror.rackspace.com/ubuntu/ precise/main amd64 Packages

  This issue does NOT occur if the image being used is already cached in
  the instances_path on the compute host.

  Here is the commit where the bug was introduced:

  https://github.com/openstack/nova/commit/6740c4141ea1152529b82cbf6e5b808eaba912e7

  It appears to be a merge issue with Folsom, as the prepare_template
  line appears above the conditional in Grizzly.

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