[ovirt-devel] v2v: download/stream disks via Libvirt API

[Shahar Havivi]

Hi,                                                                             
                                                                                
                                                     
                                                                                
                                                                                
                                                     
I want to add a utility to VDSM that stream domains disks from Libvirt remote   
                                                                                
                                                     
machine to oVirt.                                                               
                                                                                
                                                     
This utility is needed for importing kvm based VMs to oVirt, currently we are   
                                                                                
                                                     
importing VMWare and Xen VMs via virt-v2v which doesn't support kvm based VMs.  
                                                                                
                                                     
                                                                                
                                                                                
                                                     
The tool should mimic virt-v2v output for smooth integration for v2v module     
                                                                                
                                                     
in VDSM.                                                                        
                                                                                
                                                     
                                                                       
As I see it the VDSM will parse the domain xml pass to the utility the source   
                                                                                
                                                     
disks keys (remote path) and will prepare local image for the streaming:        
                                                                                
                                                     
                                                                                
                                                                                
                                                     
$ kvmstream --uri qemu://mydomain.com/system --in 
/remote/disk1.img,/remote/disk2.img --out /local/disk1.img,/local/disk2.img     
                                                                                
   
                                                                                
                                                                                
                                                     
The underline implementation is:                                                
                                                                                
                                                     
VDSM parse domain xml looks for storage disks, prepare images pass to the       
                                                                                
                                                     
utility the local/remove disks,                                                 
                                                                                
                                                     
The utility open connection to remote Libvirt use storageVolLookupByPath to     
                                                                                
                                                     
locate each remote disk and uses virStorageVolDownload(remote, local) to        
                                                                                
                                                     
stream the disks to VDSM.                                                       
                                                                                
                                                     
                                                                                
                                                                                
                                                     
POC is ready download images with virt-v2v output,                              
                                                                                
                                                     
Any suggestions/notes?                                                          
                                                                                
                                                     
                                                                                
                                                                                
                                                     
Thanks,                                                                         
                                                                                
                                                     
  Shahar Havivi. 
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