Open Stack

Hi, I'd like you to take a look at this patch for potential
SecurityImpact.
https://review.openstack.org/82841

Log:
commit 25e761acd56d4c820273fc0245ada06c500c1637
Author: David Ripton <dripton at redhat.com>
Date:   Tue Jan 28 16:38:51 2014 -0500

    Persist image format to a file, to prevent attacks based on changing it
    
    The attack is based on creating a raw image that looks like a qcow2
    image, and taking advantage of the code that used 'qemu-img info' to
    autodetect the image format.
    
    Now we store the image format to a 'disk.info' file, for Qcow2 and Raw
    images, and only autodetect for images that have never been written to
    that file.
    
    SecurityImpact
    
    Conflicts:
    	nova/virt/libvirt/imagebackend.py
    
    Manual tweaks to some mocking in test_imagebackend.py
    
    Change-Id: I2016efdb3f49a44ec4d677ac596eacc97871f30a
    Co-authored-by: Nikola Dipanov <ndipanov at redhat.com>
    Closes-bug: #1221190