Re: [PATCH v3 4/4] qemu-img: Deprecate use of -b without -F
On Mon, Mar 09, 2020 at 10:42:25AM -0500, Eric Blake wrote:
[...]
> > +qemu-img backing file without format (since 5.0.0)
> >
+''''''''''''''''''''''''''''''''''''''''''''''''''
> > +
> > +The use of ``qemu-img create``, ``qemu-img rebase``, ``qemu-img
> > +convert``, or ``qemu-img amend`` to create or modify an image that
> > +depends on a backing file now recommends that an explicit backing
> > +format be provided.
Also for the `qemu-img amend` case, I'm not clear if the following scenario
ought to throw the warning:
$> ~/build/qemu/qemu-img info --backing-chain overlay1.qcow2
image: overlay1.qcow2
file format: qcow2
virtual size: 4 GiB (4294967296 bytes)
disk size: 196 KiB
cluster_size: 65536
backing file: base.raw
Format specific information:
compat: 1.1
lazy refcounts: false
refcount bits: 16
corrupt: false
image: base.raw
file format: raw
virtual size: 4 GiB (4294967296 bytes)
disk size: 778 MiB
$> ~/build/qemu/qemu-img amend -o compat=v3 overlay1.qcow2
$> echo $?
0
I'm just trying to work out the scenarios where the warnings ought to
show up (for all the four cases: create, rebase, convert, amend).
[...]
--
/kashyap