[libvirt-users] Snapshot overlay-file deletion

[Eric Blake]

On 08/31/2018 02:17 PM, Gionatan Danti wrote:
> Hi list,
> issuing the command "virsh blockcommit --delete --pivot" (on a 
> previously created external snapshot/overlay) returns an error regarding 
> an unsupported flag warning stating "error: unsupported flags (0x2)". I 
> need to manually "rm" the affected file after the blockcommit.
> 
> A similar issue was reported many years ago here [1]. Am I missing 
> something, or is the "--delete" flag not supported?

The qemu driver still does not implement the flag. Yes, it's a known 
issue for many years now, but it is surprisingly complex to come up with 
semantics for deletion of an external snapshot in a way that doesn't 
corrupt data, so no one has tackled that code project.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org