[libvirt] [PATCH v2 3/3] qemu: Don't add -spice port=0 when no port is specified

[Ján Tomko]

On Wed, Mar 16, 2016 at 05:45:05PM +0100, Christophe Fergeau wrote:
> If a <graphics type='spice'> has no port nor tlsPort set, the generated
> QEMU command line will contain -spice port=0.
> This is later going to be ignored by spice-server, but it's better not
> to add it at all in this situation.
> As an empty -spice is not allowed, we still need to append port=0 if we
> did not add any other argument.
> ---
>  src/qemu/qemu_command.c                            | 11 +++++++++--
>  .../qemuxml2argv-graphics-spice-no-args.args       | 21 +++++++++++++++++++++
>  .../qemuxml2argv-graphics-spice-no-args.xml        | 22 ++++++++++++++++++++++
>  .../qemuxml2argv-video-virtio-gpu-spice-gl.args    |  2 +-
>  tests/qemuxml2argvtest.c                           |  2 ++
>  5 files changed, 55 insertions(+), 3 deletions(-)
>  create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-graphics-spice-no-args.args
>  create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-graphics-spice-no-args.xml
> 

ACK


> @@ -7234,7 +7234,14 @@ qemuBuildGraphicsSPICECommandLine(virQEMUDriverConfigPtr cfg,
>      virBufferTrim(&opt, ",", -1);
>  
>      virCommandAddArg(cmd, "-spice");
> -    virCommandAddArgBuffer(cmd, &opt);
> +    /* If we did not add any SPICE arguments, add a dummy 'port=0' one
> +     * as -spice alone is not allowed on QEMU command line and will be
> +     * ignored by libvirt

I am confused by the "will be ignored by libvirt" part.

Jan

> +     */
> +    if (virBufferUse(&opt) == 0)
> +        virCommandAddArg(cmd, "port=0");
> +    else
> +        virCommandAddArgBuffer(cmd, &opt);
>      if (graphics->data.spice.keymap)