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Re: [Qemu-devel] Should the "props" be documented for QMP `object-add`?

From: Daniel P . Berrangé
Subject: Re: [Qemu-devel] Should the "props" be documented for QMP `object-add`?
Date: Wed, 9 Jan 2019 11:02:08 +0000
User-agent: Mutt/1.10.1 (2018-07-13)

On Wed, Jan 09, 2019 at 09:51:13AM +0100, Kashyap Chamarthy wrote:
> I notice that the following QMP command:
>     {
>       "execute":"object-add",
>       "arguments":{
>         "qom-type":"tls-creds-x509",
>         "id":"objlibvirt_migrate_tls0",
>         "props":{
>           "dir":"/etc/pki/qemu",
>           "endpoint":"server",
>           "verify-peer":true
>         }
>       }
>     }
> ... is the same as its command-line equivalent:
>     -object 
> tls-creds-x509,id=tls0,dir=/etc/pki/qemu,endpoint=server,verify-peer=yes
> That said, in qapi/misc.json "@object-add" doesn't document any of the
> "props".  Is it on purpose?  Maybe because it is a 1:1 mapping of the
> command-line `-object` (which _is_ documented in qemu-doc.texi).
> Is it a good idea to send a patch to document the "props" in
> qapi/misc.json?  Or would it be needless duplication?

It is not practical at this time because object_add uses QOM object
properties and these are exclusively defined in code, not QAPI schema.

There's a long term todo item to use QAPI schema to define QOM objects,
which would then auto-generate the boilerplate QOM code, at which point
it all becomes self-documenting. That's basically lacking dev resources
to work on it though...

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