From: Gerd Hoffmann <kraxel@redhat.com>
To: Markus Armbruster <armbru@redhat.com>
Cc: "Michael Roth" <mdroth@linux.vnet.ibm.com>,
"László Ersek" <lersek@redhat.com>,
qemu-devel@nongnu.org, "Kővágó, Zoltán" <dirty.ice.hu@gmail.com>
Subject: Re: [Qemu-devel] [PATCH v2 2/6] qapi: support nested structs in OptsVisitor
Date: Wed, 17 Jun 2015 10:41:41 +0200 [thread overview]
Message-ID: <1434530501.5549.23.camel@redhat.com> (raw)
In-Reply-To: <87oakeg4eo.fsf@blackfin.pond.sub.org>
On Mi, 2015-06-17 at 09:50 +0200, Markus Armbruster wrote:
> Copying László because his fingerprints are on OptsVisitor.
>
> "Kővágó, Zoltán" <dirty.ice.hu@gmail.com> writes:
>
> > The current OptsVisitor flattens the whole structure, if there are same named
> > fields under different paths (like `in' and `out' in `Audiodev'), the current
> > visitor can't cope with them (for example setting `frequency=44100' will set the
> > in's frequency to 44100 and leave out's frequency unspecified).
> >
> > This patch fixes it, by the following changes:
> > 1) Specifying just the field name will apply to all fields that has the
> > specified name (this means it would set both in's and out's frequency to
> > 44100 in the above example).
> > 2) Optionally user can specify the path in the hierarchy. Names are separated by
> > a dot (e.g. `in.frequency', `foo.bar.something', etc). The user need not
> > specify the whole path, only the last few components (i.e. `bar.something' is
> > equivalent to `foo.bar.something' if only `foo' has a `bar' field). This way
> > 1) is just a special case of this when only the last component is specified.
> > 3) In case of an ambiguity (e.g `frequency=44100,in.frequency=8000') the longest
> > matching (the most specific) path wins (so in this example, in's frequency
> > would become 8000, because `in.frequency' is more specific that `frequency',
> > and out's frequency would become 44100, because only `frequency' matches it).
>
> Can you explain why the complexity is needed, i.e. why we can't just
> require full paths always?
Keeping the short names is required for -netdev backward compatibility.
Restricting to short or full (i.e. something= or foo.bar.something=, but
disallow bar.something=) should not be a problem. I'm not sure this
simplifies things much though. We have to build the full path anyway,
and I think bar.something= is just a convenient thing we get almost for
free ...
cheers,
Gerd
next prev parent reply other threads:[~2015-06-17 8:41 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-16 12:49 [Qemu-devel] [PATCH v2 0/6] -audiodev option Kővágó, Zoltán
2015-06-16 12:49 ` [Qemu-devel] [PATCH v2 1/6] qapi: qapi for audio backends Kővágó, Zoltán
2015-06-17 7:46 ` Markus Armbruster
2015-06-17 10:54 ` Kővágó Zoltán
2015-06-17 11:48 ` Markus Armbruster
2015-06-17 12:07 ` Kővágó Zoltán
2015-06-17 13:37 ` Markus Armbruster
2015-06-17 13:53 ` Kővágó Zoltán
2015-06-17 16:06 ` Markus Armbruster
2015-06-18 0:21 ` Kővágó Zoltán
2015-06-18 8:51 ` Markus Armbruster
2015-06-17 15:50 ` Eric Blake
2015-06-16 12:49 ` [Qemu-devel] [PATCH v2 2/6] qapi: support nested structs in OptsVisitor Kővágó, Zoltán
2015-06-17 7:50 ` Markus Armbruster
2015-06-17 8:41 ` Gerd Hoffmann [this message]
2015-06-17 11:01 ` Kővágó Zoltán
2015-06-17 11:50 ` Markus Armbruster
2015-06-17 15:47 ` Eric Blake
2015-06-17 11:18 ` Markus Armbruster
2015-06-17 12:11 ` Kővágó Zoltán
2015-06-17 13:41 ` Markus Armbruster
2015-06-17 14:02 ` Kővágó Zoltán
2015-06-17 16:10 ` Markus Armbruster
2015-06-16 12:49 ` [Qemu-devel] [PATCH v2 3/6] opts: do not print separator before first item in qemu_opts_print Kővágó, Zoltán
2015-06-17 7:53 ` Markus Armbruster
2015-06-17 9:02 ` Kevin Wolf
2015-06-16 12:49 ` [Qemu-devel] [PATCH v2 4/6] qapi: AllocVisitor Kővágó, Zoltán
2015-06-17 7:56 ` Markus Armbruster
2015-06-17 12:01 ` Kővágó Zoltán
2015-06-17 13:42 ` Markus Armbruster
2015-06-16 12:49 ` [Qemu-devel] [PATCH v2 5/6] audio: use qapi AudioFormat instead of audfmt_e Kővágó, Zoltán
2015-06-17 8:01 ` Markus Armbruster
2015-06-17 11:05 ` Kővágó Zoltán
2015-06-17 11:51 ` Markus Armbruster
2015-06-17 16:01 ` Eric Blake
2015-06-16 12:49 ` [Qemu-devel] [PATCH v2 6/6] audio: -audiodev command line option Kővágó, Zoltán
2015-06-17 8:13 ` Markus Armbruster
2015-06-17 11:18 ` Kővágó Zoltán
2015-06-17 12:27 ` Markus Armbruster
2015-06-17 13:25 ` Kővágó Zoltán
2015-06-17 16:13 ` Markus Armbruster
2015-06-18 6:54 ` Gerd Hoffmann
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