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[Sean Dague <sean@xxxxxxxxx>]

** Changed in: nova
       Status: Triaged => Invalid

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https://bugs.launchpad.net/bugs/1257405

Title:
  Not checking image format produces lots of useless messages

Status in OpenStack Compute (Nova):
  Invalid

Bug description:
  The code for resizing partitionless images goes with the "tell, don't
  ask" idea and attempts to run extfs / mount utilities on an image even
  though they may fail. This produces lots of useless messages during
  the instance preparation, like these:

  2013-11-21 06:45:07 20902 DEBUG nova.virt.disk.mount.api [req-939d5d50-25ea-4f7a-8882-a880b9671e47 10873781609182 10816527907643] Failed to mount filesystem: Unexpected error while running command.
  Command: sudo nova-rootwrap /etc/nova/rootwrap.conf mount /dev/nbd8 /tmp/openstack-vfs-localfsSz6ylg
  Exit code: 32
  Stdout: ''
  Stderr: 'mount: you must specify the filesystem type\n' mnt_dev /usr/lib/python2.7/dist-packages/nova/virt/disk/mount/api.py:198
  2013-11-21 06:45:07 20902 DEBUG nova.virt.disk.mount.api [req-939d5d50-25ea-4f7a-8882-a880b9671e47 10873781609182 10816527907643] Fail to mount, tearing back down do_mount /usr/lib/python2.7/dist-packages/nova/virt/disk/mount/api.py:219
  2013-11-21 06:45:07 20902 DEBUG nova.virt.disk.mount.api [req-939d5d50-25ea-4f7a-8882-a880b9671e47 10873781609182 10816527907643] Unmap dev /dev/nbd8 unmap_dev /usr/lib/python2.7/dist-packages/nova/virt/disk/mount/api.py:184
  2013-11-21 06:45:07 20902 DEBUG nova.virt.disk.mount.nbd [req-939d5d50-25ea-4f7a-8882-a880b9671e47 10873781609182 10816527907643] Release nbd device /dev/nbd8 unget_dev /usr/lib/python2.7/dist-packages/nova/virt/disk/mount/nbd.py:128
  2013-11-21 06:45:07 20902 DEBUG nova.openstack.common.processutils [req-939d5d50-25ea-4f7a-8882-a880b9671e47 10873781609182 10816527907643] Running cmd (subprocess): sudo nova-rootwrap /etc/nova/rootwrap.conf qemu-nbd -d /dev/nbd8 execute /usr/lib/python2.7/dist-packages/nova/openstack/common/processutils.py:147
  2013-11-21 06:45:07 20902 DEBUG nova.virt.disk.vfs.localfs [req-939d5d50-25ea-4f7a-8882-a880b9671e47 10873781609182 10816527907643] Failed to mount image Failed to mount filesystem: Unexpected error while running command.
  Command: sudo nova-rootwrap /etc/nova/rootwrap.conf mount /dev/nbd8 /tmp/openstack-vfs-localfsSz6ylg
  Exit code: 32
  Stdout: ''
  Stderr: 'mount: you must specify the filesystem type\n') setup /usr/lib/python2.7/dist-packages/nova/virt/disk/vfs/localfs.py:83
  2013-11-21 06:45:07 20902 DEBUG nova.virt.disk.api [req-939d5d50-25ea-4f7a-8882-a880b9671e47 10873781609182 10816527907643] Unable to mount image /var/lib/nova/instances/5159cff0-91f6-4521-a0be-d74ce4f81fad/disk with error Failed to mount filesystem: Unexpected error while running command.
  Command: sudo nova-rootwrap /etc/nova/rootwrap.conf mount /dev/nbd8 /tmp/openstack-vfs-localfsSz6ylg
  Exit code: 32
  Stdout: ''
  Stderr: 'mount: you must specify the filesystem type\n'. Cannot resize. is_image_partitionless /usr/lib/python2.7/dist-packages/nova/virt/disk/api.py:191

  This could be fixed by doing a simple check on the the image itself to
  pick up the magic signature. This would allow to skip e2resize on non-
  extfs files and simple mounting on partitioned images without the
  error messages.

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