Update version in the Makefile

Makefile

@@ -19,18 +19,19 @@ IMAGE_NAME=csi-snapshotter
 IMAGE_VERSION=canary
 IMAGE_TAG=$(REGISTRY_NAME)/$(IMAGE_NAME):$(IMAGE_VERSION)
 
+REV=$(shell git describe --long --tags --match='v*' --dirty)
+
 ifdef V
 TESTARGS = -v -args -alsologtostderr -v 5
 else
 TESTARGS =
 endif
 
-
 all: csi-snapshotter
 
 csi-snapshotter:
 	mkdir -p bin
-	CGO_ENABLED=0 GOOS=linux go build -a -ldflags '-extldflags "-static"' -o ./bin/csi-snapshotter ./cmd/csi-snapshotter
+	CGO_ENABLED=0 GOOS=linux go build -a -ldflags '-X main.version=$(REV) -extldflags "-static"' -o ./bin/csi-snapshotter ./cmd/csi-snapshotter
 
 clean:
 	-rm -rf bin

cmd/csi-snapshotter/main.go

@@ -58,12 +58,23 @@ var (
 	resyncPeriod                    = flag.Duration("resync-period", 60*time.Second, "Resync interval of the controller.")
 	snapshotNamePrefix              = flag.String("snapshot-name-prefix", "snapshot", "Prefix to apply to the name of a created snapshot")
 	snapshotNameUUIDLength          = flag.Int("snapshot-name-uuid-length", -1, "Length in characters for the generated uuid of a created snapshot. Defaults behavior is to NOT truncate.")
+	showVersion                     = flag.Bool("version", false, "Show version.")
+)
+
+var (
+	version = "unknown"
 )
 
 func main() {
 	flag.Set("logtostderr", "true")
 	flag.Parse()
 
+	if *showVersion {
+		fmt.Println(os.Args[0], version)
+		os.Exit(0)
+	}
+	glog.Infof("Version: %s", version)
+
 	// Create the client config. Use kubeconfig if given, otherwise assume in-cluster.
 	config, err := buildConfig(*kubeconfig)
 	if err != nil {