[libvirt] Event after reverting to snapshot

Cole Robinson crobinso at redhat.com
Tue Dec 8 17:59:30 UTC 2015


On 12/08/2015 12:53 PM, Dmitry Andreev wrote:
> Hi,
> 
> I'm looking for a way to catch an event about reverting to snapshot.
> 
> As I can see in the code there is no lifecycle event if VM state wasn't changed.
> 
> The comment in the code of qemuDomainRevertToSnapshot:
> 
>     /* We have the following transitions, which create the following events:
>      * 1. inactive -> inactive: none
>      * 2. inactive -> running:  EVENT_STARTED
>      * 3. inactive -> paused:   EVENT_STARTED, EVENT_PAUSED
>      * 4. running  -> inactive: EVENT_STOPPED
>      * 5. running  -> running:  none
>      * 6. running  -> paused:   EVENT_PAUSED
>      * 7. paused   -> inactive: EVENT_STOPPED
>      * 8. paused   -> running:  EVENT_RESUMED
>      * 9. paused   -> paused:   none
>      * Also, several transitions occur even if we fail partway through,
>      * and use of FORCE can cause multiple transitions.
>      */
> 
> Also there is no VIR_DOMAIN_EVENT_DEFINED event after reverting to snapshot,
> even when domain configuration is changed. Isn't that strange? Checked on
> stopped VM.
> 
> Is there any way to catch event about changes in configuration after reverting
> to snapshot.
> 

There's a similar fedora bug about this:

https://bugzilla.redhat.com/show_bug.cgi?id=1081148

I think libvirt needs to be extended to handle both the cases you mention

- Cole




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