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Re: [Qemu-block] [Qemu-devel] storing machine data in qcow images?
From: |
Richard W.M. Jones |
Subject: |
Re: [Qemu-block] [Qemu-devel] storing machine data in qcow images? |
Date: |
Tue, 5 Jun 2018 20:58:55 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Tue, Jun 05, 2018 at 02:54:07PM -0500, Eric Blake wrote:
> On 06/05/2018 02:47 PM, Michael S. Tsirkin wrote:
>
> >>>Layer 1:
> >>> The string shall always be a JSON 'object'; i.e. of the form
> >>> { "something": ... , "more": ... }
> >>>
> >>> The key strings shall be non-null and non-empty and shall
> >>> be unique.
>
> >>
> >>I think it would be simpler if layer 0 simply provided a list of
> >>names/value pairs, where names are ascii strings, and values are
> >>binary data[1]. It would make layer 1 unnecessary, and allow (3)
> >>and (4) to happen.
> >>
> >>[1] In other words, Rich's proposal of "named blobs":
> >>https://www.mail-archive.com/address@hidden/msg37856.html
> >
> >I think simple is beautiful, too. But assuming they
> >really are binary how are blobs encoded?
> >Did binary really mean UTF-8 here?
By binary I actually meant binary. The idea is you could
store things like PNG images in them (for icons).
> Binary blobs can always be base64 encoded for representation within
> a valid JSON UTF-8 string (and we already have several QMP
> interfaces that utilize base64 encoding to pass through what is
> otherwise invalid UTF-8). It does inflate things slightly compared
> to a format that allows a raw length coupled with raw data, but that
> is not necessarily a problem.
Of course how we represent them externally and/or while
using QMP / qemu-img to store and retrieve them is up for grabs.
Doesn't JSON allow binary to be encoded? (Knowing how poorly
done JSON is, I wouldn't be surprised if not)
Rich.
--
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- Re: [Qemu-block] [Qemu-devel] storing machine data in qcow images?, Dr. David Alan Gilbert, 2018/06/05
- Re: [Qemu-block] [Qemu-devel] storing machine data in qcow images?, Eduardo Habkost, 2018/06/05
- Re: [Qemu-block] [Qemu-devel] storing machine data in qcow images?, Michael S. Tsirkin, 2018/06/05
- Re: [Qemu-block] [Qemu-devel] storing machine data in qcow images?, Eric Blake, 2018/06/05
- Re: [Qemu-block] [Qemu-devel] storing machine data in qcow images?,
Richard W.M. Jones <=
- Re: [Qemu-block] [Qemu-devel] storing machine data in qcow images?, Eric Blake, 2018/06/05
- Re: [Qemu-block] [Qemu-devel] storing machine data in qcow images?, Michael S. Tsirkin, 2018/06/05
- Re: [Qemu-block] [Qemu-devel] storing machine data in qcow images?, Eric Blake, 2018/06/05
- Re: [Qemu-block] [Qemu-devel] storing machine data in qcow images?, Michael S. Tsirkin, 2018/06/05
- Re: [Qemu-block] [Qemu-devel] storing machine data in qcow images?, Dr. David Alan Gilbert, 2018/06/06
- Re: [Qemu-block] [Qemu-devel] storing machine data in qcow images?, Gerd Hoffmann, 2018/06/06
- Re: [Qemu-block] [Qemu-devel] storing machine data in qcow images?, Michael S. Tsirkin, 2018/06/05
Re: [Qemu-block] [Qemu-devel] storing machine data in qcow images?, Gerd Hoffmann, 2018/06/06
Re: [Qemu-block] [Qemu-devel] storing machine data in qcow images?, Dr. David Alan Gilbert, 2018/06/06