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In old version, function FindMedium in UIVirtualBox doesn't work for vbox2.2 and 3.0. We assume it will not be used when vbox in these versions. But when rewriting vboxStorageVolLookupByPath, we found it was compatibe to use FindMedium to get a IHardDisk object, even in vbox old versions. To achieve this, first make FindMedium call FindHardDisk when VBOX_API_VERSION < 4000000. Then change the argument type **IMedium to **IHardDisk. (As the rules in heriachy, we can't transfer a IHardDisk to match IMedium in output) In vbox 2.2 and 3.0, the caller must be aware that they will get a IHardDisk object in return.
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>