Re: [libvirt] [PATCH 0/1] qemu-ga: add guest-sync-delimited
On Mon, Feb 06, 2012 at 06:07:34PM -0600, Michael Roth wrote:
Sorry for the somewhat redundant cover letter, but needed to note
that:
This applies on top of "[PATCH v2 0/8] qemu-ga: add support for Windows", and
can also be obtained from:
git://github.com/mdroth/qemu.git qga-guest-sync-delimited
As noted in the commit there's a wiki write-up with more details on what
exactly this is for:
http://wiki.qemu.org/Features/QAPI/GuestAgent#QEMU_Guest_Agent_Protocol
It's not absolutely required, but it does make dealing with some communication
corner cases a heck of a lot easier.
Actually, let me re-spin this without the deprecated flag for
guest-sync, since I suspect a more common client implementation would do
something like:
qga.write(obj_to_json_string(req_obj))
resp_obj = obj_from_json_string(qga.readline())
as opposed to the JSON streamer that qemu-ga/QMP uses. You might miss a
response doing the above approach if there was garbage in the channel,
but you'll always been able to recover on the second attempt. So
guest-sync is still useful there, assuming we codify 1-line-per-response
in the QGA protocol.