[pve-devel] [PATCH container] api: clone_vm: don't include 'parent' property in clones

[Fabian Ebner]

Am 12.10.21 um 15:32 schrieb Oguz Bektas:
> apparently this caused a weird[0] bug... when a container with a
> snapshot 'foo' was cloned, it would take 'parent: foo' from the original
> container. when you add a new snapshot 'bar' to the cloned container,
> and then another one 'foo', this causes the snapshots to become parents
> of each other (thus not parsed correctly in the tree view of GUI nor
> with 'pct listsnapshot CTID')
> 
> [0]: https://forum.proxmox.com/threads/snapshots-of-one-lxc-disappeared.97711/
> 
> Signed-off-by: Oguz Bektas <o.bektas at proxmox.com>
> ---
>   src/PVE/API2/LXC.pm | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/src/PVE/API2/LXC.pm b/src/PVE/API2/LXC.pm
> index 1f2f1f0..15a1926 100644
> --- a/src/PVE/API2/LXC.pm
> +++ b/src/PVE/API2/LXC.pm
> @@ -1515,6 +1515,7 @@ __PACKAGE__->register_method({
>   	    delete $newconf->{snapshots};
>   	    delete $newconf->{pending};
>   	    delete $newconf->{template};
> +	    delete $newconf->{parent};
>   	    if ($param->{hostname}) {
>   		$newconf->{hostname} = $param->{hostname};
>   	    }
> 

A short note that we already do this for VMs could've been nice ;) In 
fact, we remove more properties there, namely also snapstate, snaptime 
and vmstate. Makes sense to do the same here (even if vmstate currently 
doesn't exist).

For already affected configs (luckily backups are not affected AFAICT), 
we might think about adding a cleanup/safeguard against creating loops 
when a new snapshot is created. Something like: if any already existing 
snapshot (or normal config) has the new snapshot name as parent, remove 
that parent property. Of course only after checking that the new 
snapshot name does not already exist. Or maybe die and prompt for manual 
cleanup.