[Libguestfs] [PATCH nbdkit] protocol: Implement NBD_OPT_GO.

[Nir Soffer]

On Sat, Aug 4, 2018 at 4:04 PM Richard W.M. Jones <rjones at redhat.com> wrote:

> This is only lightly tested (against just qemu NBD client), and the
> code might be structured a little better as the
> _negotiate_handshake_newstyle_options function has now grown to be
> huge.  Anyway works for me.
>

Works for my python nbd client:

$ rm -f /tmp/nbd.sock && src/nbdkit -f
plugins/file/.libs/nbdkit-file-plugin.so file=test.raw -e export -U
/tmp/nbd.sock

$ python -c "import logging; logging.basicConfig(level=logging.DEBUG); from
ovirt_imageio_common import nbd; c = nbd.Client('/tmp/nbd.sock', 'export');
c.write(1024**2, 'it works'); print c.read(1024**2, 8)"
INFO:nbd:Connecting to '/tmp/nbd.sock' 'export'
DEBUG:nbd:Received server flags: 3
DEBUG:nbd:Sending client flags: 1:
DEBUG:nbd:Sending option: 'IHAVEOPT\x00\x00\x00\x07\x00\x00\x00\x0c' data:
bytearray(b'\x00\x00\x00\x06export\x00\x00')
DEBUG:nbd:Received reply [magic=3e889045565a9 option=7 type=3 len=12]
DEBUG:nbd:Received export info [size=1073741824 flags=109]
DEBUG:nbd:Received reply [magic=3e889045565a9 option=7 type=1 len=0]
INFO:nbd:Ready for transmission
it works

Nir
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