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Description of problem:
$ qemu-img create -f vdi vdi.img 1M
Formatting 'vdi.img', fmt=vdi size=1048576 static=off 
$ qemu-img create -f qcow2 qcow2.img 1M
Formatting 'qcow2.img', fmt=qcow2 size=1048576 encryption=off cluster_size=65536 
$ file vdi.img 
vdi.img: data
$ file qcow2.img
qcow2.img: Qemu Image, Format: Qcow , Version: 2


Version-Release number of selected component (if applicable):
file-5.04-11.el6.x86_64

Created attachment 564863 [details]
proposed patch

This request was evaluated by Red Hat Product Management for inclusion in the
current release of Red Hat Enterprise Linux. Because the affected component is
not scheduled to be updated in the current release, Red Hat is unfortunately
unable to address this request at this time.  It has been proposed for the next
release. If you would like it considered as an exception in the current
release, please ask your support representative.

    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
Cause: File did not contain magic pattern to detect vdi images.
Consequence: File was not able to detect vdi images.
Fix: Magic pattern to detect vdi images have been added.
Result: File now detects vdi images as expected.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2012-1339.html