Configuration attribute to allow passing additional arguments to lxc-create

[mowings]

We have a use case where we would like to create containers with btrfs (or possibly other) backing stores. The current implementation of lxc-create (well, as shipped with 13.10) requires that we be explicit by passing -B btrfs when creating a container, else rootfs is created as a simple directory, rather than a subvolume.

So it would be good to have a config option that allows passing additional arguments to lxc-create. For example:

inst.vm.provider :lxc do |lxc|
  lxc.create_extra_opts = ['-B', 'btrfs']
end

I'll add this into my fork -- if there's any interest I can send over a pr.

[fgrehm]

I like that, please send over the PR so I can include it on the next version of the plugin :) Thanks in advance

[fgrehm]

I'm not sure we still need this now that we have a config option for setting the backingstore since the only "useful" option that would be used would be the --lxcpath param that can be made a top level config as well if there's enough interest on it.

BUT, if you or someone else is up for sending a PR that exposes those "raw" parameters I'll look into merging it ;-)