Re: [Qemu-devel] [PATCH v2] socket: allow wait=false for client socket

["Daniel P. Berrangé" <berrange@redhat.com>]

On Mon, Apr 15, 2019 at 06:16:33PM +0200, Marc-André Lureau wrote:
> On Mon, Apr 15, 2019 at 6:08 PM Daniel P. Berrangé <berrange@redhat.com> wrote:
> >
> > On Mon, Apr 15, 2019 at 06:06:09PM +0200, Marc-André Lureau wrote:
> > > Commit 767abe7 ("chardev: forbid 'wait' option with client sockets")
> > > is a bit too strict. Current libvirt always set wait=false, and will
> > > thus fail to add client chardev.
> > >
> > > Make the code more permissive, allowing wait=false with client socket
> > > chardevs.
> > >
> > > Fixes: 767abe7f49e8be14d29da5db3527817b5d696a52
> > > Cc: Daniel P. Berrangé <berrange@redhat.com>
> > > Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
> > > ---
> > >  chardev/char-socket.c | 10 +++++++---
> > >  1 file changed, 7 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/chardev/char-socket.c b/chardev/char-socket.c
> > > index 3916505d67..ebc1adb83e 100644
> > > --- a/chardev/char-socket.c
> > > +++ b/chardev/char-socket.c
> > > @@ -1263,9 +1263,13 @@ static bool qmp_chardev_validate_socket(ChardevSocket *sock,
> > >              return false;
> > >          }
> > >          if (sock->has_wait) {
> > > -            error_setg(errp, "%s",
> > > -                       "'wait' option is incompatible with "
> > > -                       "socket in client connect mode");
> > > +            warn_report("'wait' option is deprecated with "
> > > +                        "socket in client connect mode");
> > > +            if (sock->wait) {
> > > +                error_setg(errp, "%s",
> > > +                           "'wait' option is incompatible with "
> > > +                           "socket in client connect mode");
> > > +            }
> > >              return false;
> > >          }
> > >      }
> >
> > NB, it should also update qemu-deprecated.texi
> 
> Is that clear enough?
> 
> diff --git a/qemu-deprecated.texi b/qemu-deprecated.texi
> index 2219386769..0f53d1c228 100644
> --- a/qemu-deprecated.texi
> +++ b/qemu-deprecated.texi
> @@ -105,6 +105,12 @@ details.
>  The ``query-events'' command has been superseded by the more powerful
>  and accurate ``query-qmp-schema'' command.
> 
> +@subsection chardev client socket with 'wait' option (since 4.0)
> +
> +The ``chardev-add'' and ``chardev-change'' should not be used to
> +create client sockets with a ``wait'' field, which is reserved for
> +server sockets only.

It applies to command line syntax too, so I would just generalize that
a little to

 "Character devices creating sockets in client mode should not
  specify the 'wait' field, which is only applicable to sockets
  in server mode"


Regards,
Daniel
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