[Libguestfs] virt-sparsify --inline with Parallels/Virtuozzo Ploop Images

[Jonathan Wright]

virt-sparsify: error: libguestfs error: discard cannot be enabled on this
drive: qemu does not support discard for '*parallels*' format files

Since Virtuozzo 7.0.11 discard is officially supported for ploop images 
and I've mounted them with discard and confirmed this functionality 
works as expected.  Would it be possible to update libguestfs to be 
aware of this support so the --inplace flag will work?

https://virtuozzosupport.force.com/s/article/VZA-2019-059

"Native discard support in ploop enabling automatic discard requests on 
all ext4 filesystems over ploop block devices, except containers running 
on Virtuozzo Storage."

-- 
Jonathan Wright
KnownHost, LLC
https://www.knownhost.com

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