On Wed, Feb 27, 2013 at 09:42:50AM -0600, Anthony Liguori wrote:
> Paolo Bonzini <pbonzini@xxxxxxxxxx> writes:
>
> > Il 26/02/2013 20:35, Anthony Liguori ha scritto:
> >>>> >>
> >>>> >> See also discussion on multi-valued keys in command line option
> >>>> >> arguments and config files in v1 thread. Hopefully we can reach a
> >>>> >> conclusion soon, and then we'll see whether this patch is what we want.
> >>> >
> >>> > Yeah, let's drop this patch by now. I am starting to be convinced that
> >>> > "cpus=A,cpus=B,cpus=C" is the best approach. It is not pretty, but at
> >>> > least it uses generic parser code instead of yet another ad-hoc
> >>> > parser.
> >> No, we cannot rely on this behavior. We had to do it to support
> >> backwards compat with netdev but it should not be used anywhere else.
> >
> > We chose a config format (git's) because it was a good match for
> > QemuOpts, and multiple-valued operations are well supported by that
> > config format; see git-config(1). There is no reason to consider it a
> > backwards-compatibility hack.
>
> There's such thing as list support in QemuOpts.
[skipping stuff about internal implementation details that don't matter]
>
> If we want to have list syntax, we need to introduce first class support
> for it.
Absolutely. But how the syntax for it should look like?
> Here's a simple example of how to do this. Obviously we would
> want to introduce some better error checking so we can catch if someone
> tries to access a list with a non-list accessor. We also would need
> list accessor functions.
>
> But it's really not hard at all.
Of course. Once we decide how the syntax will look like, implementing
it should be very easy. But as far as I can see, we were trying to
discuss what's the appropriate syntax, here.
I still don't see why "option=A:B:C" with no possibility of having list
items containing ":" (like your proposal below) is a better generic
syntax for lists than "option=A,option=B,option=C".
> From 4ee7ed36d597f0defd78baac7480ecb29e11e1c1 Mon Sep 17 00:00:00 2001
> From: Anthony Liguori <aliguori@xxxxxxxxxx>
> Date: Wed, 27 Feb 2013 09:32:09 -0600
> Subject: [PATCH] qemu-opts: support lists
>
> Signed-off-by: Anthony Liguori <aliguori@xxxxxxxxxx>
> ---
> include/qemu/option.h | 2 ++
> util/qemu-option.c | 12 ++++++++++++
> 2 files changed, 14 insertions(+)
>
> diff --git a/include/qemu/option.h b/include/qemu/option.h
> index ba197cd..e4808c3 100644
> --- a/include/qemu/option.h
> +++ b/include/qemu/option.h
> @@ -41,6 +41,7 @@ enum QEMUOptionParType {
> typedef struct QEMUOptionParameter {
> const char *name;
> enum QEMUOptionParType type;
> + bool list;
> union {
> uint64_t n;
> char* s;
> @@ -95,6 +96,7 @@ enum QemuOptType {
> typedef struct QemuOptDesc {
> const char *name;
> enum QemuOptType type;
> + bool list;
> const char *help;
> } QemuOptDesc;
>
> diff --git a/util/qemu-option.c b/util/qemu-option.c
> index 5a1d03c..6b1ae6e 100644
> --- a/util/qemu-option.c
> +++ b/util/qemu-option.c
> @@ -636,6 +636,18 @@ static void opt_set(QemuOpts *opts, const char *name, const char *value,
> return;
> }
>
> + if (desc->list && strchr(value, ':')) {
> + gchar **tokens = g_strsplit(value, ":", 0);
> + int i;
> + for (i = 0; tokens[i]; i++) {
> + opt_set(opts, name, tokens[i], prepend, errp);
> + if (error_is_set(errp)) {
> + return;
> + }
> + }
> + g_strfreev(tokens);
> + }
> +
> opt = g_malloc0(sizeof(*opt));
> opt->name = g_strdup(name);
> opt->opts = opts;
> --
> 1.8.0
>
>
> Regards,
>
> Anthony Liguori
>
> >
> > Paolo
--
Eduardo
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