Network configuration is lost when machine definition overrides provider's configuration

[ggiamarchi]

When network configuration is defined in a provider block outside of a machine definition, it is not taken into account if the provider configuration is overridden inside a machine definition.

For instance, in my tenant i have two networks net1 and net2. The following Vagrantfile fails on vagrant up

Vagrant.configure('2') do |config|

  config.ssh.username = ENV['OS_SSH_USERNAME']

  config.vm.provider :openstack do |os|
    os.openstack_auth_url    = ENV['OS_AUTH_URL']
    os.tenant_name           = ENV['OS_TENANT_NAME']
    os.username              = ENV['OS_USERNAME']
    os.password              = ENV['OS_PASSWORD']
    os.floating_ip_pool      = ENV['OS_FLOATING_IP_POOL']
    os.flavor                = ENV['OS_FLAVOR']
    os.image                 = ENV['OS_IMAGE']
    os.networks             << 'net1'
  end

  config.vm.define 'server' do |s|
    s.vm.provider :openstack do

    end
  end
end

with the error

Multiple possible networks found, use a Network ID to be more specific.

because the network configuration had not been included in the query sent to nova to create the machine.

If i define machines without override provider's configuration it works. For instance,

config.vm.define 'server-1' do |s|
  s.vm.provider :openstack
end

config.vm.define 'server-2'

works correctly.