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Description of problem:
Although finding interface with matching mac addr, the return is still '1'.

Version-Release number of selected component (if applicable):
libvirt-0.9.8-0rc2.el6.x86_64

How reproducible:
always.

Steps to Reproduce:
1. virsh domif-getlink <guest name> <interface mac>
2. echo $?
  
Actual results:
# virsh domif-getlink vr-rhel6u2-x86_64-kvm 52:54:00:2f:c4:5d
52:54:00:2f:c4:5d default

# echo $?
1


Expected results:
return 0 when the result is right.

Additional info:

Patch for upstream:

https://www.redhat.com/archives/libvir-list/2011-December/msg00378.html

Patch has been ACKed and pushed on upstream.

commit 623562964867a4e1927cacb97aa895219e02ccfc
Author: Peter Krempa <pkrempa>
Date:   Thu Dec 8 10:09:59 2011 +0100

    virsh: return correct value from cmdDomIfGetLink
    
    Reported by Alex Jia <ajia>. Function cmdDomIfGetLink did not
    set a success return value on success path.
    
    Signed-off-by: Alex Jia<ajia>

I test with libvirt-0.9.8-1.el6.x86_64, the same issue.

Roproduce it with libvirt-0.9.8-0rc2.el6.x86_64.
Verify it with libvirt-0.9.9-1.el6 and it passed.

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/RHSA-2012-0748.html