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Re: [kvm-devel] [Qemu-devel] Re: Storing command line options in images
From: |
Laurent Vivier |
Subject: |
Re: [kvm-devel] [Qemu-devel] Re: Storing command line options in images |
Date: |
Mon, 13 Aug 2007 11:19:18 +0200 |
User-agent: |
Thunderbird 1.5.0.2 (X11/20060420) |
Avi Kivity wrote:
> Jorge Lucángeli Obes wrote:
>>>> My feeling is that config files are outdated. When used with a gui,
>>>> you end up writing silly parsers and stuff and still wrecking things
>>>> horribly when the the gui writer's expectations don't match reality.
>>>> When used without a gui, they increase the amount of details one has
>>>> to remember (where's that config file? I renamed my image, did I
>>>> remember to update the config file?). They also make upgrading more
>>>> difficult.
>>>>
>>> There's only so much that can be expressed on a command line. There are
>>> actually limits to the command line size on a lot of platforms. I don't
>>> see why reading options from a file is so much worse than reading them
>>> from the command line.
>>>
>>
>> In my view, the bottom line is: we need an _easy_ way of launching VMs
>> when one doesn't want all the options of the managed approach. I back
>> Avi on this one, I would like to be able to do
>>
>> qemu guest.img
>>
>
> Well, I disagree with Avi now. Dan's comment about guest images now
> being untrusted is a killer.
>
>> without worrying about configuration files, or XML, or parsing. That's
>> not to say that a global configuration file for QEMU wouldn't be
>> useful, but I think it would solve a different problem.
>>
>> When I read Avi's TODO, I basically thought about getting rid of the
>> long command lines I had to store in scripts. I wanted to write that
>> command line once, and then forgetting about it, until I needed to
>> change it. I wanted an image to be self-contained as much as possible.
>> That's what I set to achieve.
>>
>> All that said, I rethought Anthony's idea of storing plain text in the
>> image and with proper tools, it can work out. I don't like the idea of
>> having users overwriting and padding files, but the approach seems
>> less of a hack than using empty snapshots. In short: I think we will
>> need to have something like 'qemu-img cmdline' anyways, independent of
>> the implementation. That's because I would like an implementation that
>> does not depend on extra files. For that, we already have libvirt and
>> the likes.
>>
>
> I like the format-independent nature of Anthony's idea too. Basically
> we're adding a meta-format that works along with all other formats.
>
> Anthony's other idea, to require self-contained images to be executable,
> may be workable. I have some doubts that it is a sufficient indicator
> of trust (though with normal shell scripts and executables it is).
I know we are not in democracy, but if I can vote I'd like to vote to the idea
of Christian Brunschen...
We can modify qemu to test if the argument is a directory, if yes, it reads args
from file args in this directory and for security the disk image must be in the
same directory.
for instance, we have:
./pc1/
./pc1/args
./pc1/my_disk
and in ./pc1/args, we have "-hda my_disk"
and when we run "qemu pc1", it starts "qemu -hda ./pc1/my_disk"
I don't like the idea of the config file (when it is complex it is very hard to
have a correct one like for Xen or like for Xorg)
I don't like the idea of Anthony because it looks like a hack .
Laurent, the killjoy
--
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"Software is hard" - Donald Knuth
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- [Qemu-devel] Storing command line options in images, Jorge Lucángeli Obes, 2007/08/10
- [Qemu-devel] Re: [kvm-devel] Storing command line options in images, Anthony Liguori, 2007/08/10
- Re: [Qemu-devel] Re: [kvm-devel] Storing command line options in images, Avi Kivity, 2007/08/10
- Re: [kvm-devel] [Qemu-devel] Re: Storing command line options in images, Anthony Liguori, 2007/08/10
- Re: [kvm-devel] [Qemu-devel] Re: Storing command line options in images, Avi Kivity, 2007/08/10
- Re: [kvm-devel] [Qemu-devel] Re: Storing command line options in images, Anthony Liguori, 2007/08/10
- Re: [kvm-devel] [Qemu-devel] Re: Storing command line options in images, Jorge Lucángeli Obes, 2007/08/10
- Re: [kvm-devel] [Qemu-devel] Re: Storing command line options in images, Avi Kivity, 2007/08/13
- Re: [kvm-devel] [Qemu-devel] Re: Storing command line options in images,
Laurent Vivier <=
- Re: [kvm-devel] [Qemu-devel] Re: Storing command line options in images, Christian MICHON, 2007/08/13
- Re: [kvm-devel] [Qemu-devel] Re: Storing command line options in images, Markus Hitter, 2007/08/14
- Re: [kvm-devel] [Qemu-devel] Re: Storing command line options in images, Laurent Vivier, 2007/08/14
- Re: [kvm-devel] [Qemu-devel] Re: Storing command line options in images, Jorge Lucángeli Obes, 2007/08/14
- Re: [kvm-devel] [Qemu-devel] Re: Storing command line options in images, Thiemo Seufer, 2007/08/14
- Re: [kvm-devel] [Qemu-devel] Re: Storing command line options in images, Christian MICHON, 2007/08/14
- Re: [kvm-devel] [Qemu-devel] Re: Storing command line options in images, Thiemo Seufer, 2007/08/13
- Re: [kvm-devel] [Qemu-devel] Re: Storing command line options in images, Christian MICHON, 2007/08/13
- Re: [kvm-devel] [Qemu-devel] Re: Storing command line options in images, Philip Boulain, 2007/08/13
- [Qemu-devel] Re: [kvm-devel] Storing command line options in images, Jernej Simončič, 2007/08/13