[Libguestfs] [nbdkit PATCH] sh: Allow pwrite to not consume all data

[Richard W.M. Jones]

I pushed this as commit d40eb85b2 including the changes suggested by
Laszlo and Eric.  Thanks!

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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nbdkit - Flexible, fast NBD server with plugins
https://gitlab.com/nbdkit/nbdkit