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1734cdb995
This fixes https://bugzilla.redhat.com/show_bug.cgi?id=638633 Although scripts are not used by interfaces of type other than "ethernet" in qemu, due to the fact that the parser stores the script name in a union that is only valid when type is ethernet or bridge, there is no way for anyone except the parser itself to catch the problem of specifying an interface script for an inappropriate interface type (by the time the parsed data gets back to the code that called the parser, all evidence that a script was specified is forgotten). Since the parser itself should be agnostic to which type of interface allows scripts (an example of why: a script specified for an interface of type bridge is valid for xen domains, but not for qemu domains), the solution here is to move the script out of the union(s) in the DomainNetDef, always populate it when specified (regardless of interface type), and let the driver decide whether or not it is appropriate. Currently the qemu, xen, libxml, and uml drivers recognize the script parameter and do something with it (the uml driver only to report that it isn't supported). Those drivers have been updated to log a CONFIG_UNSUPPORTED error when a script is specified for an interface type that's inappropriate for that particular hypervisor. (NB: There was earlier discussion of solving this problem by adding a VALIDATE flag to all libvirt APIs that accept XML, which would cause the XML to be validated against the RNG files. One statement during that discussion was that the RNG shouldn't contain hypervisor-specific things, though, and a proper solution to this problem would require that (again, because a script for an interface of type "bridge" is accepted by xen, but not by qemu). |
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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>