[Libguestfs] [PATCH libnbd] copy: Always allow multiple connections

[Richard W.M. Jones]

Actually no, I had to revert this.

https://gitlab.com/nbdkit/libnbd/-/commit/fb42056929e9177e0de2603e2f430a8111ae7a5f

I added a test:

https://gitlab.com/nbdkit/libnbd/-/commit/23b41ad0a2a6d6582a8e643e42960d2e3c72e53e

However the test deadlocks when we try to open multiple connections to
qemu-nbd (with your patch).  As best I can tell this is because of
qemu's file locking.  qemu-nbd doesn't seem to support the -U option
found in qemu-img, but even if it did I don't think it would be a good
idea to tell users that they have to use it.

I think this needs to be fixed in qemu-nbd itself.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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