Re: [libvirt PATCH] qemu_snapshot: fix detection if non-leaf snapshot isn't in active chain

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On Tue, Jan 30, 2024 at 13:15:50 +0100, Pavel Hrdina wrote:
> The condition was completely wrong. As per the comment for function
> virDomainMomentIsAncestor() it checks that the first argument is
> descendant of the second argument.
> 
> Consider the following snapshot tree for VM:
> 
>   s1
>     |
>     +- s2
>     |   |
>     |   +- s3
>     |
>     +- s4
>         |
>         +- s5 (current)
> 
> When deleting s2 with the original code we checked if
> virDomainMomentIsAncestor(s2, s5) which would return false basically for
> any snapshot as s5 is leaf snapshot so no children.
> 
> When deleting s2 with fixed code we check if
> virDomainMomentIsAncestor(s5, s2) which still returns false but when
> deleting s4 it will correctly return true.
> 
> Resolves: https://issues.redhat.com/browse/RHEL-23212
> Signed-off-by: Pavel Hrdina <phrdina@xxxxxxxxxx>
> ---
>  src/qemu/qemu_snapshot.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Please add the currently-wrong error message into the commit message.

Reviewed-by: Peter Krempa <pkrempa@xxxxxxxxxx>
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