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Although reverting to a snapshot is a form of data loss, this is normally expected. However, there are two cases where additional surprises (failure to run the reverted state, or a break in connectivity to the domain) can come into play. Requiring extra acknowledgment in these cases will make it less likely that someone can get into an unrecoverable state due to a default revert. Also create a new error code, so users can distinguish when forcing would make a difference, rather than having to blindly request force. * include/libvirt/libvirt.h.in (VIR_DOMAIN_SNAPSHOT_REVERT_FORCE): New flag. * src/libvirt.c (virDomainRevertToSnapshot): Document it. * include/libvirt/virterror.h (VIR_ERR_SNAPSHOT_REVERT_RISKY): New error value. * src/util/virterror.c (virErrorMsg): Implement it. * tools/virsh.c (cmdDomainSnapshotRevert): Add --force to virsh. * tools/virsh.pod (snapshot-revert): Document it.
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>