[libvirt] [PATCHv3 0/2] notify about reverting to a snapshot

[John Ferlan]

On 12/23/2015 09:25 AM, Dmitry Andreev wrote:
> Reverting to snapshot may change domain configuration but
> there will be no events about that.
> 
> Lack of the event become a problem for virt-manager 
> https://bugzilla.redhat.com/show_bug.cgi?id=1081148
> 
> This patch-set introduces new event and emits it in
> qemuDomainRevertToSnapshot.
> 
> v3:
> [2/2] event is emited only in the case when stopped domain
>   is reverted to a stopped domain.
> 
> Dmitry Andreev (2):
>   Introduce new VIR_DOMAIN_EVENT_DEFINED_FROM_SNAPSHOT sub-event
>   qemu: emit 'defined' event after reverted to snapshot without state
>     changes
> 
>  examples/object-events/event-test.c | 2 ++
>  include/libvirt/libvirt-domain.h    | 1 +
>  src/qemu/qemu_driver.c              | 8 +++++++-
>  tools/virsh-domain.c                | 3 ++-
>  4 files changed, 12 insertions(+), 2 deletions(-)
> 

This seems to be a reasonable approach; however, since Peter understands
the snapshot code better than I do, I expect he will want to chime in
(I've CC'd him).

It does seem though it's important to note somehow in the documentation
of the new event that it is only useful for the offline -> offline
revert.  Think patch 1's comment and commit message.

w/r/t patch 2 - the new else statement ...

 * Don't see any way that event could be defined...

 * Doesn't seem to matter if the FORCE flag was used or not

so it seems just an "else if (config)" could be done.

John