Re: [PATCH v18 03/14] net/tap: deprecate "no" as special value for script/downscript

On Mon, Jul 13, 2026 at 12:37:54PM +0300, Vladimir Sementsov-Ogievskiy wrote:
> On 13.07.26 10:45, Markus Armbruster wrote:
> > Vladimir Sementsov-Ogievskiy <[email protected]> writes:
> > 
> > > The interface is ambiguous, as "no" is valid file name. So,
> > > using "no" as a special value to disable script is deprecated.
> > > Use an empty string ("script=" / "downscript=") instead.
> > > 
> > > In a future version, "no" will be treated as a plain file name, just
> > > like any other non-empty value.
> > > 
> > > Document the deprecation in docs/about/deprecated.rst, qapi/net.json,
> > > and qemu-options.hx. Update other docs to use empty string instead of
> > > "no". Add a warning.
> > > 
> > > Signed-off-by: Vladimir Sementsov-Ogievskiy <[email protected]>
> > 
> > [...]
> > 
> > > diff --git a/net/tap.c b/net/tap.c
> > > index fedd48c48d2..1ec9e5ebe6f 100644
> > > --- a/net/tap.c
> > > +++ b/net/tap.c
> > > @@ -103,6 +103,8 @@ static bool tap_is_explicit_no_script(const char *script_arg)
> > >       }
> > >       if (strcmp(script_arg, "no") == 0) {
> > > +        warn_report("script=no/downscript=no is deprecated; "
> > > +                    "use script=/downscript= instead");
> > 
> > net_init_tap() could pass the parameter name for a simpler error
> > message.  Probably not worth the bother.
> > 
> > >           return true;
> > >       }
> > 
> > In net_init_tap_one():
> > 
> >             qemu_set_info_str(&s->nc, "ifname=%s,script=%s,downscript=%s", ifname,
> >                               script ?: "no", downscript ?: "no");
> > 
> > This sets nc->info_str, which is shown by "info network".  Should we
> > replace "no" by ""?
> > 
> 
> Agree, will do.

Would it be better to not include the script/downscript parameters at
all if they're disabled ?

With regards,
Daniel
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