Re: [PATCH v2] hmp: Make json format optional for qom-set

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* David Hildenbrand (david@redhat.com) wrote:
> Commit 7d2ef6dcc1cf ("hmp: Simplify qom-set") switched to the json
> parser, making it possible to specify complex types. However, with this
> change it is no longer possible to specify proper sizes (e.g., 2G, 128M),
> turning the interface harder to use for properties that consume sizes.
> 
> Let's switch back to the previous handling and allow to specify passing
> json via the "-j" parameter.
> 
> Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
> Cc: Markus Armbruster <armbru@redhat.com>
> Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
> Cc: Paolo Bonzini <pbonzini@redhat.com>
> Cc: "Daniel P. Berrangé" <berrange@redhat.com>
> Cc: Eduardo Habkost <ehabkost@redhat.com>
> Signed-off-by: David Hildenbrand <david@redhat.com>

Yep OK.  Shame it's got back to even more complex but it makes sense.


Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

> ---
> v1 - v2:
> - keep the "value:S" as correctly noted by Paolo :)
> ---
>  hmp-commands.hx    |  7 ++++---
>  qom/qom-hmp-cmds.c | 20 ++++++++++++++++----
>  2 files changed, 20 insertions(+), 7 deletions(-)
> 
> diff --git a/hmp-commands.hx b/hmp-commands.hx
> index 28256209b5..5d12fbeebe 100644
> --- a/hmp-commands.hx
> +++ b/hmp-commands.hx
> @@ -1806,9 +1806,10 @@ ERST
>  
>      {
>          .name       = "qom-set",
> -        .args_type  = "path:s,property:s,value:S",
> -        .params     = "path property value",
> -        .help       = "set QOM property",
> +        .args_type  = "json:-j,path:s,property:s,value:S",
> +        .params     = "[-j] path property value",
> +        .help       = "set QOM property.\n\t\t\t"
> +                      "-j: the property is specified in json format.",
>          .cmd        = hmp_qom_set,
>          .flags      = "p",
>      },
> diff --git a/qom/qom-hmp-cmds.c b/qom/qom-hmp-cmds.c
> index f704b6949a..a794e62f0b 100644
> --- a/qom/qom-hmp-cmds.c
> +++ b/qom/qom-hmp-cmds.c
> @@ -44,15 +44,27 @@ void hmp_qom_list(Monitor *mon, const QDict *qdict)
>  
>  void hmp_qom_set(Monitor *mon, const QDict *qdict)
>  {
> +    const bool json = qdict_get_try_bool(qdict, "json", false);
>      const char *path = qdict_get_str(qdict, "path");
>      const char *property = qdict_get_str(qdict, "property");
>      const char *value = qdict_get_str(qdict, "value");
>      Error *err = NULL;
> -    QObject *obj;
>  
> -    obj = qobject_from_json(value, &err);
> -    if (err == NULL) {
> -        qmp_qom_set(path, property, obj, &err);
> +    if (!json) {
> +        Object *obj = object_resolve_path(path, NULL);
> +
> +        if (!obj) {
> +            error_set(&err, ERROR_CLASS_DEVICE_NOT_FOUND,
> +                      "Device '%s' not found", path);
> +        } else {
> +            object_property_parse(obj, value, property, &err);
> +        }
> +    } else {
> +        QObject *obj = qobject_from_json(value, &err);
> +
> +        if (!err) {
> +            qmp_qom_set(path, property, obj, &err);
> +        }
>      }
>  
>      hmp_handle_error(mon, err);
> -- 
> 2.26.2
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK