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[libvirt-users] problem cloning storage pool volume



I'm trying to clone a volume in a storage pool and I'm following the steps described here: http://libvirt.org/docs/libvirt-appdev-guide-python/en-US/html/libvirt_application_development_guide_using_python-Storage_Pools-Cloning.html

My code looks like:

 destXML = """
            <volume>
              <name>"""+newDiskName+""".qcow2</name>                  
              <target>
                <path>/jffs2/disk0/"""+poolName+'/'+newDiskName+""".qcow2</path>
                <format type='qcow2'/>
                <permissions>
                  <owner>-1</owner>
                  <group>-1</group>
                  <mode>0644</mode>
                  <label>virt_image_t</label>
                </permissions>
              </target>
            </volume>"""

srcDisk = tmpPool.storageVolLookupByName(vDisk)
newVol = sp.createXMLFrom(destXML,srcDisk, 0)  

According to the steps described in the link, this should be it; but I can't start any VM that are using this volume.

Also comparing the volume XML files for src/dest it looks like the format is not copied over:
source:
<volume type='file'>
  <name>k.qcow2</name>
  <key>/jffs2/disk0/sp/vDisk.qcow2</key>
  <source>
  </source>
  <capacity unit='bytes'>3221225472</capacity>
  <allocation unit='bytes'>332075008</allocation>
  <target>
    <path>/jffs2/disk0/sp/vDisk.qcow2</path>
    <format type='qcow2'/>
    <permissions>
      <mode>0644</mode>
      <owner>0</owner>
      <group>0</group>
    </permissions>
    <timestamps>
      <atime>1455879195</atime>
      <mtime>1455879171</mtime>
      <ctime>1455879171</ctime>
    </timestamps>
  </target>


dest:
<volume type='file'>
  <name>newDiskName.qcow2</name>
  <key>/jffs2/disk0/sp/newDiskName.qcow2</key>
  <source>
  </source>
  <capacity unit='bytes'>3221225472</capacity>
  <allocation unit='bytes'>326868992</allocation>
  <target>
    <path>/jffs2/disk0/sp/newDiskName.qcow2</path>
    <format type='raw'/>
    <permissions>
      <mode>0644</mode>
      <owner>0</owner>
      <group>0</group>
    </permissions>
    <timestamps>
      <atime>1455878686</atime>
      <mtime>1455878681</mtime>
      <ctime>1455878681</ctime>
    </timestamps>
  </target>
</volume>

I this a bug in  libvirt->createXMLFrom ?? Or am I missing something?

Thanks,
Andrei

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