Make no assumptions on biosdevname/systemd device naming

This hopefully covers all use cases regardless of the distro or device type
(virtio, e1000, rtl8139, passthrough).

README.md

@@ -63,8 +63,12 @@ Vagrant.configure("2") do |config|
     :ovirt__network_name => 'ovirtmgmt' #DHCP
     # Static configuration
     #:ovirt__ip => '192.168.2.198', :ovirt__network_name => 'ovirtmgmt', :ovirt__gateway => '192.168.2.125', :ovirt__netmask => '255.255.0.0', :ovirt__dns_servers => '192.168.2.1', :ovirt__dns_search => 'test.local'
-    # Static configuration with biosdevname naming interfaces in format ensX, where X starts from 3
-    #:ovirt__ip => '192.168.2.198', :ovirt__network_name => 'ovirtmgmt', :ovirt__gateway => '192.168.2.125', :ovirt__netmask => '255.255.0.0', :ovirt__dns_servers => '192.168.2.1', :ovirt__dns_search => 'test.local', :ovirt__biosdevname => true
+    # Static configuration with biosdevname. Guest OS assigns interface names (ens3, em1 or something else). ovirt__interface_name has to match that name.
+    #:ovirt__ip => '192.168.2.198', :ovirt__network_name => 'ovirtmgmt', :ovirt__gateway => '192.168.2.125', :ovirt__netmask => '255.255.0.0', :ovirt__dns_servers => '192.168.2.1', :ovirt__dns_search => 'test.local', :ovirt__interface_name => 'ens3'
+
+#  configure additional interface
+#  config.vm.network :private_network,
+#    :ovirt__ip => '192.168.2.199', :ovirt__network_name => 'ovirtmgmt', :ovirt__netmask => '255.255.0.0', :ovirt__interface_name => 'ens4'
 
   config.vm.provider :ovirt4 do |ovirt|
     ovirt.url = 'https://server/ovirt-engine/api'

lib/vagrant-ovirt4/action/start_vm.rb

@@ -46,16 +46,15 @@ def call(env)
           (0...configured_ifaces_options.length()).each do |iface_index|
             iface_options = configured_ifaces_options[iface_index]
 
-            if iface_options[:biosdevname] then
-              prefix = 'ens'
-              iface_index = iface_index + 3
+            if iface_options[:interface_name] != nil then
+              iface_name = iface_options[:interface_name]
             else
-              prefix = 'eth'
+              iface_name = "eth#{iface_index}"
             end
 
             if iface_options[:ip] then
               nic_configuration = {
-                name: "#{prefix}#{iface_index}",
+                name: iface_name,
                 on_boot: true,
                 boot_protocol: OvirtSDK4::BootProtocol::STATIC,
                 ip: {
@@ -67,7 +66,7 @@ def call(env)
               }
             else
               nic_configuration = {
-                name: "#{prefix}#{iface_index}",
+                name: iface_name,
                 on_boot: true,
                 boot_protocol: OvirtSDK4::BootProtocol::DHCP,
               }