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Consider the following valid snapshot XML as the <driver> element is
allowed to be empty in the domainsnapshot.rng schema:
$ cat snap.xml
<domainsnapshot>
<disks>
<disk name='vda' snapshot='external'>
<source file='/tmp/foo'/>
<driver/>
</disk>
</disks>
</domainsnapshot>
produces the following error:
$ virsh snapshot-create domain snap.xml
error: internal error: unknown disk snapshot driver '(null)'
The driver type is parsed as NULL from the XML as the attribute is not
present and then directly used to produce the error message.
With this patch the attempt to parse the driver type is skipped if not
present to avoid changing the schema to forbid the empty driver element.
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>