@kiwiflyer Instead of tr and cut, can you improve string processing (maybe use 
more predictable sed/awk like simply do this `grep $path | awk '{print $1}'`  
if you only want the target device, like vda, vdb etc.)? I'm concerned if 
different versions of libvirt or different distributions may give a different 
kind of output.

[ Full content available at: https://github.com/apache/cloudstack/pull/2878 ]
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