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Description of problem:
When do p2p migration to an unknown host, libvirt will report error like
error: operation failed: Failed to connect to remote libvirt URI (null)
here the "(null)" should be the uri content.

Version-Release number of selected component (if applicable):
libvirt-0.9.4-2.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1. start a guest
2. do migration with command
# virsh migrate --p2p guest qemu+ssh://1.1.1.1/system
  
Actual results:
error: operation failed: Failed to connect to remote libvirt URI (null)

Expected results:
error: operation failed: Failed to connect to remote libvirt URI qemu+ssh://1.1.1.1/system

Additional info:

Verify pass on
libvirt-0.9.4-5.el6.x86_64

# virsh migrate --p2p guest qemu+ssh://1.1.1.1/system
error: operation failed: Failed to connect to remote libvirt URI qemu+ssh://1.1.1.1/system

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    New Contents:
Cause:
Invalid variable was used to construct the error message.

Consequence:
If a migration command has failed, the error message reported the remote URI to be '(null)' instead of the requested migration URI. This could hide the reason why the command failed.

Fix:
Error message is constructed using the correct variable containing the migration URI.

Result:
Correct migration URI is reported on error.

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-2011-1513.html