Re: [Qemu-devel] [PATCH] net: Inform the user about deprecated -net options

[Paolo Bonzini <pbonzini@redhat.com>]

On 15/12/2015 12:46, Thomas Huth wrote:
> We likely don't want to maintain the legacy -net options forever,
> so let's start informing the users that this option will be
> removed in a future version. However, there are two cases where
> we should not spill out a message yet: First is the "-net nic"
> option which might still be required to configure on-board NICs
> that can not be handled via "-netdev" yet, and second is the
> "-net user" default option that is created automatically when
> no other networking option has been specified.
> 
> Signed-off-by: Thomas Huth <thuth@redhat.com>
> ---
>  net/net.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/net/net.c b/net/net.c
> index ade6051..2593961 100644
> --- a/net/net.c
> +++ b/net/net.c
> @@ -1006,6 +1006,12 @@ static int net_client_init1(const void *object, int is_netdev, Error **errp)
>              return -1;
>          }
>  
> +        if (opts->type != NET_CLIENT_OPTIONS_KIND_NIC &&
> +            (!default_net || opts->type != NET_CLIENT_OPTIONS_KIND_USER)) {
> +            error_report("Deprecated net option - "
> +                         "this will be removed in a future version!");
> +        }

Honestly, I still do not believe that they will be removed.  They are
little more than syntactic sugar at this point.

Paolo

>          if (!net_client_init_fun[opts->type]) {
>              error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
>                         "a net backend type (maybe it is not compiled "
>