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This is the API agreed on in: https://www.redhat.com/archives/libvir-list/2011-May/msg00026.html (with a slight name change to use "...begin" rather than "...start"). This implements transactional changes to the host network config. When a transaction is begun with ncf_change_begin(), all other netcf APIs will continue to work as they always have, but a snapshot of the existing config will be taken, allowing reversion (rollback, using ncf_change_rollback()) to the exact state of config at the time ncf_change_begin() was called. Alternately, if it's determined that the new changes are acceptable, ncf_change_commit() can be called, which will eliminate the snapshot and make the changes permanent. As a failsafe measure, if neither ncf_change_commit() or ncf_change_rollback() is called by the next time the system reboots, the netcf-transaction initscript will be automatically called to rollback the changes.
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>