Hello,
some time ago I hand to manipulate the domain XML description using Pythons
Elemtree XML implementation, which had problems generating the right format
for libvirt: elemtree just supports adding Qname elements (that
is "{http://libvirt.org/schemas/domain/qemu/1.0}commandline";) which
internally would create a temporary binding of this namespace to the "ns0"
Prefix.
My work-around for Elemtree was the add the name-space mapping for "qemu"
to "http://libvirt.org/schemas/domain/qemu/1.0"; to ETs internal mapping table
and add an "xmlns:qemu" attribute by hand:
ET._namespace_map[QEMU_URI] = 'qemu'
domain.attrib['xmlns:qemu'] = QEMU_URI
libvirt on the other hand expects the prefix to be "qemu" and only checks,
that this prefix is bound to the URI mentioned above at the root node).
The following examples would be XML valid, but are not accepted by libvirt:
<domain>...
<qemu:commandline xmlns:qemu="http://libvirt.org/schemas/domain/qemu/1.0";>
...</qemu:commandline>
</domain>
<domain xmlns:ns0="http://libvirt.org/schemas/domain/qemu/1.0";>...
<ns0:commandline>
...</ns0:commandline>
</domain>
The following (esoteric) example might be wrongly accepted by libvirt
(untested):
<domain xmlns:qemu="http://libvirt.org/schemas/domain/qemu/1.0";>
<qemu:commandline xmlns:qemu="urn:foo">
...</qemu:commandline>
</domain>
I don't know if this is worth fixing, but I still encountered the first two
problems myself and had to spend some time to detecting what I did wrong. So
at least I want to share my finding with others, so they don't do the same
mistake.
Sincerely
Philipp Hahn
--
Philipp Hahn Open Source Software Engineer hahn@xxxxxxxxxxxxx
Univention GmbH Linux for Your Business fon: +49 421 22 232- 0
Mary-Somerville-Str.1 D-28359 Bremen fax: +49 421 22 232-99
http://www.univention.de/
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