[Feature]Add subcommand --version (ray-project#166)

* add subcommand --version

* fix

* lint

Co-authored-by: wuhua.ck <wuhua.ck@alibaba-inc.com>

ray-operator/Makefile

@@ -1,3 +1,5 @@
+BUILD_TIME      := $(shell date "+%F %T")
+COMMIT_SHA1     := $(shell git rev-parse HEAD )
 
 # Image URL to use all building/pushing image targets
 IMG ?= controller:latest
@@ -58,7 +60,13 @@ test: manifests generate fmt vet ## Run tests.
 ##@ Build
 
 build: generate fmt vet ## Build manager binary.
-	go build -o bin/manager main.go
+	go build                                    \
+    -ldflags                                    \
+    "                                           \
+    -X 'main._buildTime_=${BUILD_TIME}'         \
+    -X 'main._commitId_=${COMMIT_SHA1}'         \
+    "                                           \
+    -o bin/manager main.go
 
 run: manifests generate fmt vet ## Run a controller from your host.
 	go run ./main.go

ray-operator/main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"flag"
+	"fmt"
 	"os"
 
 	"sigs.k8s.io/controller-runtime/pkg/healthz"
@@ -19,8 +20,11 @@ import (
 )
 
 var (
-	scheme   = runtime.NewScheme()
-	setupLog = ctrl.Log.WithName("setup")
+	_version_   = "0.2"
+	_buildTime_ = ""
+	_commitId_  = ""
+	scheme      = runtime.NewScheme()
+	setupLog    = ctrl.Log.WithName("setup")
 )
 
 func init() {
@@ -30,11 +34,13 @@ func init() {
 }
 
 func main() {
+	var version bool
 	var metricsAddr string
 	var enableLeaderElection bool
 	var probeAddr string
 	var reconcileConcurrency int
 	var watchNamespace string
+	flag.BoolVar(&version, "version", false, "Show the version information.")
 	flag.StringVar(&metricsAddr, "metrics-addr", ":8080", "The address the metric endpoint binds to.")
 	flag.StringVar(&probeAddr, "health-probe-bind-address", ":8081", "The address the probe endpoint binds to.")
 	flag.BoolVar(&enableLeaderElection, "enable-leader-election", true,
@@ -50,6 +56,12 @@ func main() {
 	}
 	opts.BindFlags(flag.CommandLine)
 	flag.Parse()
+	if version {
+		fmt.Printf("Version:\t%s\n", _version_)
+		fmt.Printf("Commit ID:\t%s\n", _commitId_)
+		fmt.Printf("Build time:\t%s\n", _buildTime_)
+		os.Exit(0)
+	}
 
 	ctrl.SetLogger(zap.New(zap.UseFlagOptions(&opts)))