[libvirt-users] Mounting VM filesystem on host while VM running

[Michal Privoznik]

On 08.08.2016 13:23, Andrea Bolognani wrote:
> On Mon, 2016-08-08 at 10:37 +0200, Michal Privoznik wrote:
>> On 08.08.2016 10:23, Patrick PICHON wrote:
>>>  
>>> hello Michal,
>>>  
>>> That was my worries as well, and I think that your advice is probably
>>> the right one. Or even, I'm might request an enhancement to the collect
>>> libvirt plugin to report also FS information.
>>  
>> What I'd like to see is libvirt's ability to spawn commands inside
>> guest. But it is not that simple. I mean, the hardest part is to design
>> public libvirt API. For instance, we'd have to deal with both blocking &
>> non-blocking (i.e. long-running) commands; then we would need to give
>> users possibility to read command's output (possibly asynchronously).
>>  
>> With this, you'd just: virDomainRunCommand(dom, 'df', '-h', NULL); or
>> something and you'd be good.
> 
> Not as straightforward as you'd like, but if you use QEMU you
> can already achieve something similar via qemu-guest-agent.
> 
> https://www.redhat.com/archives/libvir-list/2016-August/msg00339.html

This is exactly what I had in mind when writing those lines above. It is
not very convenient for user I'd say. Anyway, it shows that we should
start discussing the design for our virDomainCommand* API - users would
benefit from it.

Michal