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Re: [Qemu-devel] [PATCH 1/1] Add -version-simple argument, printing only
From: |
Daniel P. Berrange |
Subject: |
Re: [Qemu-devel] [PATCH 1/1] Add -version-simple argument, printing only version number. |
Date: |
Fri, 14 May 2010 14:34:33 +0100 |
User-agent: |
Mutt/1.4.1i |
On Fri, May 14, 2010 at 01:24:44PM +0200, Markus Armbruster wrote:
> "Daniel P. Berrange" <address@hidden> writes:
>
> > On Fri, May 14, 2010 at 11:42:57AM +0200, Markus Armbruster wrote:
> >> "Daniel P. Berrange" <address@hidden> writes:
> [...]
> >> > It would also be nice to avoid having to parse the -help output to
> >> > determine
> >> > ARGV supported too. I wonder if it would be a good idea to just produce a
> >> > well structured equivalent to -help that provides the same data, but in
> >> > JSON format for sane parsing. That would let peple easily determine the
> >> > supported ARGV as well as version number(s)
> >>
> >> I'm all for machine-readable self-documentation. And the place for that
> >> is QMP. Humble beginnings are already there:
> >>
> >> { "execute": "query-version", "arguments": { } }
> >> --> {"return": {"qemu": "0.12.50", "package": ""}}
> >>
> >> { "execute": "query-commands", "arguments": { } }
> >> --> {"return": [{"name": "quit"}, {"name": "eject"}, [...]
> >>
> >> Any practical problems with use of QMP instead of parsing command line
> >> option output?
> >
> > It is unneccessarily complex for such a simple task, requiring you to
> > configure & connect to the monitor & do the capabilities negotiaton
> > and then issue the command.
> >
> > To just query the version requires this ridiculous interaction:
> >
> > $ qemu -chardev stdio,id=monitor -monitor chardev=monitor,mode=control
> > {"execute":"qmp_capabilities"}
> > {"QMP": {"version": {"qemu": "0.12.1", "package": "
> > (qemu-kvm-0.12.1.2)"}, "capabilities": []}}
> > {"execute":"query-version"}
> > {"return": {"qemu": "0.12.50", "package": ""}}
>
> Actually,
>
> $ qemu -nodefaults -nographic -S -chardev stdio,id=qmp -mon
> mode=control,chardev=qmp </dev/null
> {"QMP": {"version": {"qemu": "0.12.50", "package": ""}, "capabilities": []}}
>
> suffices, with the minor wart that you have to SIGINT out.
Only in this particular example. The same pain I illustrate still exists
for other static query actions such as query-device, or a hypothetical
query-argv for getting supported command line args. I really think we need
to map these into the more concise & easily accessible style:
> > eg, make this work:
> >
> > $ qemu -query-version
> > {"qemu": "0.12.50", "package": ""}
>
> I wouldn't mind.
Regards,
Daniel
--
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- [Qemu-devel] [PATCH] Add -version-simple argument to QEMU, Jes . Sorensen, 2010/05/13
- [Qemu-devel] [PATCH 1/1] Add -version-simple argument, printing only version number., Jes . Sorensen, 2010/05/13
- Re: [Qemu-devel] [PATCH 1/1] Add -version-simple argument, printing only version number., Daniel P. Berrange, 2010/05/13
- Re: [Qemu-devel] [PATCH 1/1] Add -version-simple argument, printing only version number., Jes Sorensen, 2010/05/13
- Re: [Qemu-devel] [PATCH 1/1] Add -version-simple argument, printing only version number., Blue Swirl, 2010/05/13
- Re: [Qemu-devel] [PATCH 1/1] Add -version-simple argument, printing only version number., Markus Armbruster, 2010/05/14
- Re: [Qemu-devel] [PATCH 1/1] Add -version-simple argument, printing only version number., Daniel P. Berrange, 2010/05/14
- Re: [Qemu-devel] [PATCH 1/1] Add -version-simple argument, printing only version number., Markus Armbruster, 2010/05/14
- Re: [Qemu-devel] [PATCH 1/1] Add -version-simple argument, printing only version number.,
Daniel P. Berrange <=
- Re: [Qemu-devel] [PATCH 1/1] Add -version-simple argument, printing only version number., Anthony Liguori, 2010/05/14
- Re: [Qemu-devel] [PATCH 1/1] Add -version-simple argument, printing only version number., Daniel P. Berrange, 2010/05/14
- Re: [Qemu-devel] [PATCH 1/1] Add -version-simple argument, printing only version number., Anthony Liguori, 2010/05/14
- Re: [Qemu-devel] [PATCH 1/1] Add -version-simple argument, printing only version number., Daniel P. Berrange, 2010/05/14
- Re: [Qemu-devel] [PATCH 1/1] Add -version-simple argument, printing only version number., Markus Armbruster, 2010/05/14
[Qemu-devel] Re: [PATCH 1/1] Add -version-simple argument, printing only version number., Anthony Liguori, 2010/05/14