qemu hook: event for source host too

[Guy Godfroy]

Cool :)
Don't worry I'm not on a rush: I guess the feature will not be part of 
Debian before next major release anyway.

Le ven., janv. 24, 2020 at 17:24, Michal Privoznik 
<mprivozn at redhat.com> a écrit :
> On 1/24/20 4:34 PM, Guy Godfroy wrote:
>> I don't really understand what new hook this would be.
> 
> Libvirt's migration happens in phases [1]. The last one is 'Confirm' 
> where either the domain is either killed (because it's running on the 
> destination successfully), or resumed (because there was an error).
> 
> If you make a lock shared at the beginning of the migration, but 
> migration doesn't succeed you want to make it exclusive again in the 
> Confirm phase. Or release it, because the domain is being killed (in 
> which case we already run a hook script, so might get away with this 
> specific case). Basically, in the hook called from the confirm phase 
> you want to undo everything that the hook script called at the 
> beginning of the migration has done.
> 
> BTW: I might have some time to work on this during weekend, but no 
> promises. If you want to write patches though, I can give you some 
> pointers and review them ;-)
> 
> Michal
> 
> 1: 
> <https://libvirt.org/git/?p=libvirt.git;a=blob;f=src/libvirt-domain.c;h=4074397b30c3bba8b57d2058b3608234dd7a20ec;hb=HEAD#l2933>

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