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Description of problem:
Atomic diff leaks FD when comparing images are not RPM based,
it's caused by a ValueError exception without executing clean
up work.

Version-Release number of selected component (if applicable):
# rpm -q atomic docker
atomic-1.7-2.git68be076.el7.x86_64
docker-1.9.0-9.el7.x86_64

# cat /etc/redhat-release 
Red Hat Enterprise Linux Server release 7.1 (Maipo)

How reproducible:
always

Steps to Reproduce:
1. docker pull busybox
2. atomic diff -nr busybox busybox
3. df -hT

Actual results:

# atomic diff -nr busybox busybox
busybox is not RPM based.

# df | grep /tmp
/dev/dm-4                               10190100    38072   9611356   1% /tmp/d6d0332d84515366e5d0
/dev/dm-5                               10190100    38072   9611356   1% /tmp/12fca07986c8d85d76b2

Expected results:
Fix FD leaks

Additional info:

https://github.com/projectatomic/atomic/pull/234

Corrected in PR -> https://github.com/projectatomic/atomic/pull/239

Merged into upstream

Fixed in atomic-1.8

There is no FD leaks on atomic-1.8-2.gita35ae18.el7.x86_64, so move the bug to VERIFIED status.

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.

https://rhn.redhat.com/errata/RHBA-2016-0527.html