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Re: [Qemu-devel] feature idea: allow user to run custom scripts
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] feature idea: allow user to run custom scripts |
Date: |
Thu, 1 Oct 2015 09:01:47 +0100 |
User-agent: |
Mutt/1.5.24 (2015-08-30) |
* Markus Armbruster (address@hidden) wrote:
> "Dr. David Alan Gilbert" <address@hidden> writes:
>
> > * Markus Armbruster (address@hidden) wrote:
> >> "Dr. David Alan Gilbert" <address@hidden> writes:
> >>
> >> > * Peter Maydell (address@hidden) wrote:
> >> >> On 29 September 2015 at 14:11, Dr. David Alan Gilbert
> >> >> <address@hidden> wrote:
> >> >> > * Peter Maydell (address@hidden) wrote:
> >> >> >> On 28 September 2015 at 20:43, Programmingkid
> >> >> >> <address@hidden> wrote:
> >> >> >> >
> >> >> >> > On Sep 28, 2015, at 3:29 AM, Markus Armbruster wrote:
> >> >> >> >> You didn't mention you're talking about a *GUI* feature.
> >> >> >> >
> >> >> >> > I'm thinking it would be easier to send in the patch rather
> >> >> >> > than talk about
> >> >> >> > what this feature could be.
> >> >> >>
> >> >> >> I think Markus and I are trying to save you that effort by
> >> >> >> pointing out that this is a VM management layer feature,
> >> >> >> not a core QEMU feature.
> >> >> >
> >> >> > OK, so I'm going to agree with Programmingkid here.
> >> >> > I think this would be a useful feature to have in QEMU; I've
> >> >> > got gratuitous hacks in some of my test scripts that work
> >> >> > around it not being there.
> >> >> >
> >> >> > I think there are two possible things, both of which seem fairly
> >> >> > easy:
> >> >> > 1) Add a -chardev from file that works in this case
> >> >> > (I don't think the current chardev file works does it?)
> >>
> >> In general, character devices provide a bidirectional pipe, but -chardev
> >> file is write-only. I think you want -chardev pipe. I don't use it
> >> myself, because as socat user, I don't have to learn lesser tools :)
> >>
> >> Here's how I use it. Set up a local socket (any convenient
> >> bidirectional pipe would do, actually).
> >>
> >> Example: QMP
> >>
> >> # Configuration file for -readconfig
> >> [chardev "qmp"]
> >> backend = "socket"
> >> path = "sock-qmp"
> >> server = "on"
> >> wait = "off"
> >>
> >> [mon "qmp"]
> >> mode = "control"
> >> chardev = "qmp"
> >>
> >> Example: HMP
> >>
> >> [chardev "hmp"]
> >> backend = "socket"
> >> path = "sock-hmp"
> >> server = "on"
> >> wait = "off"
> >>
> >> [mon "hmp"]
> >> mode = "readline"
> >> chardev = "hmp"
> >>
> >> Then do stuff with it.
> >>
> >> Example: interactive QMP
> >>
> >> $ socat UNIX:sock-qmp READLINE,history=$HOME/.qmp_history,prompt='QMP>
> >> '
> >>
> >> Example: interactive HMP
> >>
> >> $ socat UNIX:sock-hmp READLINE,history=$HOME/.hmp_history
> >>
> >> Arguably superior to our built-in not-quite readline monitor.
> >>
> >> Example: send QMP input from a file, capture its output in a file
> >>
> >> $ socat UNIX:sock-qmp STDIO <input >output
> >
> > Yes, this example is exactly why I want something less painful.
> > A -chardev file that allowed read/write would be ideal, to be able to read
> > a series of commands at startup.
>
> Have you tried -chardev pipe? As I said, I don't use it myself, because
> my "painful" setup is more flexible, and not painful at all once set up.
Yes, I do use -chardev pipe in some of my scripts, and yes it's simpler
than the socket setup, but it's still a lot more complex than just stuffing
a list of commands in.
Dave
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK
- Re: [Qemu-devel] feature idea: allow user to run custom scripts, (continued)
- Re: [Qemu-devel] feature idea: allow user to run custom scripts, Markus Armbruster, 2015/10/08
- Re: [Qemu-devel] feature idea: allow user to run custom scripts, Dr. David Alan Gilbert, 2015/10/08
- Re: [Qemu-devel] feature idea: allow user to run custom scripts, Peter Maydell, 2015/10/08
- Re: [Qemu-devel] feature idea: allow user to run custom scripts, Programmingkid, 2015/10/08
- Re: [Qemu-devel] feature idea: allow user to run custom scripts, Paolo Bonzini, 2015/10/08
- Re: [Qemu-devel] feature idea: allow user to run custom scripts, Kevin Wolf, 2015/10/08
- Re: [Qemu-devel] feature idea: allow user to run custom scripts, Daniel P. Berrange, 2015/10/08
- Re: [Qemu-devel] feature idea: allow user to run custom scripts, Programmingkid, 2015/10/08
- Re: [Qemu-devel] feature idea: allow user to run custom scripts, Markus Armbruster, 2015/10/08
- Re: [Qemu-devel] feature idea: allow user to run custom scripts, Markus Armbruster, 2015/10/08
- Re: [Qemu-devel] feature idea: allow user to run custom scripts,
Dr. David Alan Gilbert <=
- Re: [Qemu-devel] feature idea: allow user to run custom scripts, Daniel P. Berrange, 2015/10/08
- Re: [Qemu-devel] feature idea: allow user to run custom scripts, Dr. David Alan Gilbert, 2015/10/08
- Re: [Qemu-devel] feature idea: allow user to run custom scripts, Daniel P. Berrange, 2015/10/08
- Re: [Qemu-devel] feature idea: allow user to run custom scripts, Programmingkid, 2015/10/08
- Re: [Qemu-devel] feature idea: allow user to run custom scripts, Eric Blake, 2015/10/08
- Re: [Qemu-devel] feature idea: allow user to run custom scripts, Programmingkid, 2015/10/08