On Fri, Feb 19, 2016 at 12:33:10PM +0000, Andrei Perietanu wrote:

On Fri, Feb 19, 2016 at 12:12 PM, Martin Kletzander <mkletzan@redhat.com>
wrote:

On Fri, Feb 19, 2016 at 11:12:32AM +0000, Andrei Perietanu wrote:

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'/>*

So there are two bugs here, probably.  Does this go away if you refresh
the pool?

         No, refreshing the pool does not help. The problem is not that I
don't see the new volume, the problem is I get a "raw" file instead of
"qcow2"

I know, I wanted to see whether that format changed.  Are those files
really cloned?  I tried the same thing you did and I have the right
format there.  What libvirt version are you running?

The other thing is that it doesn't matter what's here, you should
explicitly specify the format in the domain XML anyway.  Do you do that?

      The tutorial I followed (libvirt.org) says:
"Cloning a storage volume is similar to creating a new storage volume,
except that an existing storage volume is used for most of the attributes.
Only the name and permissions in the XML parameter are used for the new
volume, everything else is inherited from the existing volume."
So I don't specifically mention the file formal in the xml for the new
volume.

   <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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taking of any action in reliance upon this information by persons or
entities other than the intended recipient is prohibited. If you receive
this in error please contact the sender and delete the material from any
computer immediately. It is the policy of Klas  Limited to disavow the
sending of offensive material and should you consider that the material
contained in the message is offensive you should contact the sender
immediately and also your I.T. Manager.

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Washington, DC 20007.

Klas Limited (Company Number 163303) trading as Klas Telecom, an Irish
Limited Liability Company, with its registered office at Fourth Floor, One
Kilmainham Square, Inchicore Road, Kilmainham, Dublin 8, Ireland.