Add kvm2 --version

Makefile

@@ -366,7 +366,7 @@ release-minikube: out/minikube checksum
 out/docker-machine-driver-kvm2:
 	go build 																		\
 		-installsuffix "static" 													\
-		-ldflags "-X k8s.io/minikube/pkg/drivers/kvm/version.VERSION=$(VERSION)" 	\
+		-ldflags "-X k8s.io/minikube/pkg/drivers/kvm.version=$(VERSION)" 	\
 		-tags libvirt.1.3.1 														\
 		-o $(BUILD_DIR)/docker-machine-driver-kvm2 									\
 		k8s.io/minikube/cmd/drivers/kvm

cmd/drivers/kvm/main.go

@@ -19,10 +19,18 @@ limitations under the License.
 package main
 
 import (
+	"fmt"
+	"os"
+
 	"github.com/docker/machine/libmachine/drivers/plugin"
 	"k8s.io/minikube/pkg/drivers/kvm"
 )
 
 func main() {
+	if len(os.Args) > 1 && os.Args[1] == "--version" {
+		fmt.Println(kvm.GetVersion())
+		return
+	}
+
 	plugin.RegisterDriver(kvm.NewDriver("", ""))
 }

pkg/drivers/kvm/version.go

@@ -0,0 +1,27 @@
+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package kvm
+
+// The current version of the docker-machine-driver-kvm2
+
+// version is a private field and should be set when compiling with --ldflags="-X k8s.io/minikube/pkg/drivers/kvm.version=vX.Y.Z"
+var version = "v0.0.0-unset"
+
+// GetVersion returns the current docker-machine-driver-kvm2 version
+func GetVersion() string {
+	return version
+}