[PATCH 2/2] qemu-img: Require -F with -b backing image

[Eric Blake]

On 5/3/21 4:36 PM, Eric Blake wrote:
> Back in commit d9f059aa6c (qemu-img: Deprecate use of -b without -F),
> we deprecated the ability to create a file with a backing image that
> requires qemu to perform format probing.  Qemu can still probe older
> files for backwards compatibility, but it is time to finish off the
> ability to create such images, due to the potential security risk they
> present.  Update a couple of iotests affected by the change.
> 
> Signed-off-by: Eric Blake <eblake at redhat.com>
> ---
>  docs/system/deprecated.rst       | 20 -----------------
>  docs/system/removed-features.rst | 19 ++++++++++++++++
>  block.c                          | 37 ++++++++++----------------------
>  qemu-img.c                       |  6 ++++--
>  tests/qemu-iotests/114           | 18 ++++++++--------
>  tests/qemu-iotests/114.out       | 11 ++++------
>  tests/qemu-iotests/301           |  4 +---
>  tests/qemu-iotests/301.out       | 16 ++------------
>  8 files changed, 50 insertions(+), 81 deletions(-)

I'll need a followup to fix iotest failures in 40 and 41 (apparently
they weren't passing backing formats, but I did not catch them in my
original cleanup of iotests back in commit b66ff2c298)

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org