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This is in response to bugzilla 664629 https://bugzilla.redhat.com/show_bug.cgi?id=664629 The patch below returns an appropriate error message if the chain of nwfilters is found to contain unresolvable variables and therefore cannot be instantiated. Example: The following XMl added to a domain: <interface type='bridge'> <mac address='52:54:00:9f:80:45'/> <source bridge='virbr0'/> <model type='virtio'/> <filterref filter='test'/> </interface> that references the following filter <filter name='test' chain='root'> <filterref filter='clean-traffic'/> <filterref filter='allow-dhcp-server'/> </filter> now displays upon 'virsh start mydomain' error: Failed to start domain mydomain error: internal error Cannot instantiate filter due to unresolvable variable: DHCPSERVER 'DHPCSERVER' is contained in allow-dhcp-server.
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>