libvirt users - Jun 2012 - How to list and change domain's disk image file

Hi

I'm writing a C program using libvirt API and need to list the storage
volumes used by each domain. I'm wondering if there is a way to do
this better of searching the XML strings of all domains, does anyone
can suggest me something ?

I also need to create a function to change the img file of a given
domain. I intend to do the following:

1. virDomainGetXMLDesc (domain)
2. change the XML to other img file
3. virDomainUndefine (domain)
4. virDomainCreateXML (changed XML)

Am i correct doing this ? There is a better method ?

Thanks

Ricardo

On 06/11/2012 08:20 PM, Ricardo Hillbrecht wrote:
> Hi
> 
> I'm writing a C program using libvirt API and need to list the storage
> volumes used by each domain. I'm wondering if there is a way to do
> this better of searching the XML strings of all domains, does anyone
> can suggest me something ?
Parsing the XML is the current method of doing this.  I have plans of
someday adding a new API that returns a list of virStorageVolPtr
corresponding to a given domain, but that's still a ways down the road.
> 
> I also need to create a function to change the img file of a given
> domain. I intend to do the following:
> 
> 1. virDomainGetXMLDesc (domain)
> 2. change the XML to other img file
> 3. virDomainUndefine (domain)
You can skip this step (it is okay to redefine an existing domain).
> 4. virDomainCreateXML (changed XML)
> 
> Am i correct doing this ? There is a better method ?
You are doing it correctly for affecting the next boot; and this is how
programs like virt-manager do it.  If you want the changes to take place
while the domain is live, then you will have to use the hotplug APIs
such as virDomainDeviceModify.

-- 
Eric Blake   eblake at redhat.com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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