[Libguestfs] [PATCH 2/2] actions: refactor available & feature_available

[Richard W.M. Jones]

On Thu, Nov 05, 2015 at 04:56:43PM +0100, Pino Toscano wrote:
> Refactor the internal_feature_available to return the result for just
> one group, so it is easier to know on the library side what was the
> actual error, and which group refers to; drop internal_available, as no
> more needed after this.
> 
> On the library side, implement in available and feature_available the
> real logic to iterate through the requested group, and error out or
> return whether the groups are available. This also introduces caching
> for the features, so each needs to be queried just once in each
> appliance run.
> 
> The result of this is that there should be much less communication with
> the daemon to know about available features; the downside is that
> queries for more than one group at once, not already cached, will be
> cause more queries to the daemon.

Looks OK, ACK.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-builder quickly builds VMs from scratch
http://libguestfs.org/virt-builder.1.html