Re: [Qemu-devel] [PATCH] pty: unbreak libvirt

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

On Thu, Jan 03, 2013 at 02:23:03PM +0100, Gerd Hoffmann wrote:
> Commit 586502189edf9fd0f89a83de96717a2ea826fdb0 breaks libvirt pty
> support because it tried to figure the pts name from stderr output.
> 
> Fix this by moving the label to the end of the line, this way the
> libvirt parser does still recognise the message.  libvirt looks
> for "char device redirected to ${ptsname}<whitespace>".

FWIW, libvirt was not supposed to be parsing this data still.
We rely on query-chardev to get the PTYs, but we were accidentally
still invoking the stdio parsing code even though we didn't use
the result :-(

This flaw is fixed in latest libvirt GIT.

> 
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
>  qemu-char.c |    9 +++++----
>  1 files changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/qemu-char.c b/qemu-char.c
> index 331ad5c..f41788c 100644
> --- a/qemu-char.c
> +++ b/qemu-char.c
> @@ -1012,10 +1012,11 @@ static CharDriverState *qemu_chr_open_pty(QemuOpts *opts)
>      qemu_opt_set(opts, "path", q_ptsname(master_fd));
>  
>      label = qemu_opts_id(opts);
> -    fprintf(stderr, "char device%s%s redirected to %s\n",
> -            label ? " " : "",
> -            label ?: "",
> -            q_ptsname(master_fd));
> +    fprintf(stderr, "char device redirected to %s%s%s%s\n",
> +            q_ptsname(master_fd),
> +            label ? " (label " : "",
> +            label ? label      : "",
> +            label ? ")"        : "");
>  
>      s = g_malloc0(sizeof(PtyCharDriver));
>      chr->opaque = s;


Daniel
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