[Libguestfs] [nbdkit PATCH] nbd: Update for libnbd 0.1.5

[Richard W.M. Jones]

On Thu, Jun 27, 2019 at 04:06:21PM -0500, Eric Blake wrote:
> libnbd 0.1.5 was released today, but is not yet packaged for
> Fedora. I'd prefer to bump the minimum version in the pkg-config check
> in configure.ac, as such, I won't be pushing this patch as-is, but
> waiting until Fedora does have the newer build. But anyone playing
> with a self-built libnbd library in the meantime needs this patch to
> deal with the ABI change.

The new build is in Fedora already, but for F29/F30 is still waiting
in the queue:

https://bodhi.fedoraproject.org/updates/FEDORA-2019-c301e5692c
https://bodhi.fedoraproject.org/updates/FEDORA-2019-83f9a5e552

I wouldn't bother with hacks to deal with both APIs, just bump the
minimum required version.

Rich.

>  plugins/nbd/nbd.c | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/plugins/nbd/nbd.c b/plugins/nbd/nbd.c
> index 68ea3dd0..818f94d6 100644
> --- a/plugins/nbd/nbd.c
> +++ b/plugins/nbd/nbd.c
> @@ -783,9 +783,18 @@ nbdplug_flush (void *handle, uint32_t flags)
>    return nbdplug_reply (h, s);
>  }
> 
> +/* XXX: Hack this signature to compile to 0.1.3 (minimum configure
> + * version) as well as 0.1.5 (API change, with witness of the addition
> + * of pread_structured at the same release). Once configure requires a
> + * higher minimum version, the #if hack can be dropped.
> + */
>  static int
>  nbdplug_extent (void *opaque, const char *metacontext, uint64_t offset,
> -                uint32_t *entries, size_t nr_entries)
> +                uint32_t *entries, size_t nr_entries
> +#if LIBNBD_HAVE_NBD_PREAD_STRUCTURED
> +                , int *error
> +#endif
> +                )
>  {
>    struct nbdkit_extents *extents = opaque;
> 
> -- 
> 2.20.1
> 
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