Re: [libvirt] mdevctl: A shoestring mediated device management and persistence utility

On Mon, 1 Jul 2019 10:20:43 +0200 Cornelia Huck <cohuck(a)redhat.com&gt; wrote: > On Fri, 28 Jun 2019 11:05:46 -0600 > Alex Williamson <alex.williamson(a)redhat.com&gt; wrote: > > > On Fri, 28 Jun 2019 11:06:48 +0200 > > Cornelia Huck <cohuck(a)redhat.com&gt; wrote: > > > > What do you think of a way to specify JSON for the attributes directly > > > on the command line? Or would it be better to just edit the config > > > files directly? > > > > Supplying json on the command like seems difficult, even doing so with > > with jq requires escaping quotes. It's not a very friendly > > experience. Maybe something more like how virsh allows snippets of xml > > to be included, we could use jq to validate a json snippet provided > > as a file and add it to the attributes... of course if we need to allow > > libvirt to modify the json config files directly, the user could do > > that as well. Is there a use case you're thinking of? Maybe we could > > augment the 'list' command to take a --uuid and --dumpjson option and > > the 'define' command to accept a --jsonfile. Maybe the 'start' command > > could accept the same, so a transient device could define attributes > > w/o excessive command line options. Thanks, > > > > Alex > > I was mostly thinking about complex configurations where writing a JSON > config would be simpler than adding a lot of command line options. > Something like dumping a JSON file and allowing to refer to a JSON file > as you suggested could be useful; but then, those very complex use > cases are probably already covered by editing the config file directly. > Not sure if it is worth the effort; maybe just leave it as it is for > now. Well, I already did it. It seems useful for creating transient devices with attribute specifications. If it's too ugly we can drop it.

Thanks, Alex