[PATCH v5 0/8] Configurable policy for handling deprecated interfaces

Peter Maydell peter.maydell at linaro.org
Mon Sep 21 12:56:52 UTC 2020

On Mon, 14 Sep 2020 at 09:55, Markus Armbruster <armbru at redhat.com> wrote:
> New option -compat lets you configure what to do when deprecated
> interfaces get used.  This is intended for testing users of the
> management interfaces.  It is experimental.
> -compat deprecated-input=<in-policy> configures what to do when
> deprecated input is received.  Available policies:
> * accept: Accept deprecated commands and arguments (default)
> * reject: Reject them
> * crash: Crash
> -compat deprecated-output=<out-policy> configures what to do when
> deprecated output is sent.  Available output policies:
> * accept: Emit deprecated command results and events (default)
> * hide: Suppress them
> For now, -compat covers only deprecated syntactic aspects of QMP.  We
> may want to extend it to cover semantic aspects, CLI, and experimental
> features.

Some bikeshedding on option naming...

If this only covers QMP, should we make the argument to -compat
have a name that expresses that? eg deprecated-qmp-input,
deprecated-qmp-output ?

Also, it seems a bit repetitive to say 'deprecated' here all
the time -- do you have a future use of -compat in mind which
would be to adjust something that is *not* deprecated ? If
not, maybe the 'deprecated' part should be in the option name
rather than in every argument, eg

  -deprecation-compat qmp-input=crash,qmp-output=hide,cli-option=reject


-- PMM

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