Re: [PATCH v5 5/8] qapi: Implement deprecated-output=hide for QMP introspection

[Eric Blake <eblake@redhat.com>]

On 9/14/20 3:47 AM, Markus Armbruster wrote:
> This policy suppresses deprecated bits in output, and thus permits
> "testing the future".  Implement it for QMP command query-qmp-schema:
> suppress information on deprecated commands, events and object type
> members, i.e. anything that has the special feature flag "deprecated".
> 
> Signed-off-by: Markus Armbruster <armbru@redhat.com>
> ---
>   qapi/introspect.json                 |   2 +-
>   monitor/monitor-internal.h           |   3 -
>   monitor/misc.c                       |   2 -
>   monitor/qmp-cmds-control.c           | 100 +++++++++++++++++++++++----
>   storage-daemon/qemu-storage-daemon.c |   2 -
>   5 files changed, 89 insertions(+), 20 deletions(-)
> 
> diff --git a/qapi/introspect.json b/qapi/introspect.json
> index 944bb87a20..39bd303778 100644
> --- a/qapi/introspect.json
> +++ b/qapi/introspect.json
> @@ -49,7 +49,7 @@
>   ##
>   { 'command': 'query-qmp-schema',
>     'returns': [ 'SchemaInfo' ],
> -  'gen': false }                # just to simplify qmp_query_json()
> +  'allow-preconfig': true }

Interesting change. Dropping 'gen':false is explained below...

> @@ -153,17 +157,89 @@ EventInfoList *qmp_query_events(Error **errp)
>       return ev_list;
>   }
>   
> -/*
> - * Minor hack: generated marshalling suppressed for this command
> - * ('gen': false in the schema) so we can parse the JSON string
> - * directly into QObject instead of first parsing it with
> - * visit_type_SchemaInfoList() into a SchemaInfoList, then marshal it
> - * to QObject with generated output marshallers, every time.  Instead,
> - * we do it in test-qobject-input-visitor.c, just to make sure
> - * qapi-gen.py's output actually conforms to the schema.
> - */
> -void qmp_query_qmp_schema(QDict *qdict, QObject **ret_data,
> -                                 Error **errp)
> +static void *split_off_generic_list(void *list,
> +                                    bool (*splitp)(void *elt),
> +                                    void **part)

...but adding 'allow-preconfig':true, while it makes sense, seems a bit 
unrelated.  Worth a better commit message?

Reviewed-by: Eric Blake <eblake@redhat.com>

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