[Libguestfs] [nbdkit PATCH 3/4] server: Implement list_exports.

[Eric Blake]

On 7/31/20 5:22 PM, Eric Blake wrote:
> From: "Richard W.M. Jones" <rjones at redhat.com>
> 
> See also:
> https://www.redhat.com/archives/libguestfs/2020-July/msg00090.html
> Message-Id: <20200722124201.1823468-2-rjones at redhat.com>
> 
> For now, this implementation is only for plugins; adding filter
> support will come later (and probably requires further edits, for the
> ability for any filter to open up an independent connection to the
> plugin without being handed next_ops on entry).
> ---

> @@ -652,6 +661,46 @@ Returning C<0> will allow the connection to continue.  If there is an
>   error or you want to deny the connection, call C<nbdkit_error> with an
>   error message and return C<-1>.
> 
> +=head2 C<.list_exports>
> +
> + int list_exports (int readonly, int default_only,
> +                   struct nbdkit_exports *exports);

I'm trying to figure out a situation where knowing whether we are 
running under 'nbdkit -r' (and thus all exports will be read-only) will 
affect the list advertised by the plugin.  But then again, we _do_ pass 
the readonly flag to both .preconnect and .open, which are bookends 
around this call.  That said, now's the time to decide whether to keep 
it or to simplify the interface by dropping it, before we bake in a 
stable release with the API.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org