Fix VIF creation.

src/api/vm.coffee

@@ -884,21 +884,13 @@ exports.attachDisk = attachDisk
 # FIXME: position should be optional and default to last.
 
 createInterface = $coroutine ({vm, network, position, mtu, mac}) ->
-  xapi = @getXAPI vm
-
-  VIF_ref = $wait xapi.call 'VIF.create', {
-    VM: vm.ref
-    network: network.ref
-    device: position
-    MTU: mtu ? '1500'
-    MAC: mac ? ''
-    other_config: {}
-    qos_algorithm_type: ''
-    qos_algorithm_params: {}
-  }
-
-  return $wait(xapi.call( 'VIF.get_record', VIF_ref)).uuid
+  vif = $wait @getXAPI(vm).createVirtualInterface(vm.id, network.id, {
+    mac,
+    mtu,
+    position
+  })
 
+  return vif.$id
 
 createInterface.params = {
   vm: { type: 'string' }

src/xapi.js

@@ -486,6 +486,30 @@ export default class Xapi extends XapiBase {
 
   // =================================================================
 
+  async createVirtualInterface (vmId, networkId, {
+    mac = '',
+    mtu = 1500,
+    position = 0
+  } = {}) {
+    const vm = this.getObject(vmId)
+    const network = this.getObject(networkId)
+
+    const ref = await this.call('VIF.create', {
+      device: String(position),
+      MAC: String(mac),
+      MTU: String(mtu),
+      network: network.$ref,
+      other_config: {},
+      qos_algorithm_params: {},
+      qos_algorithm_type: '',
+      VM: vm.$ref
+    })
+
+    return await this._getOrWaitObject(ref)
+  }
+
+  // =================================================================
+
   async _doDockerAction (vmId, action, containerId) {
     const vm = this.getObject(vmId)
     const host = vm.$resident_on

src/xo.js

@@ -312,7 +312,8 @@ export default class Xo extends EventEmitter {
         $poolId: {
           enumerable: true,
           value: pool.$id
-        }
+        },
+        ref: { value: xapiObject.$ref }
       })
 
       objects.set(id, xoObject)