Print information about NGINX version

cmd/nginx/main.go

@@ -59,6 +59,8 @@ func main() {
 		glog.Fatal(err)
 	}
 
+	nginxVersion()
+
 	fs, err := file.NewLocalFS()
 	if err != nil {
 		glog.Fatal(err)

cmd/nginx/nginx.go

@@ -0,0 +1,37 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+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 main
+
+import (
+	"os"
+	"os/exec"
+
+	"github.com/golang/glog"
+)
+
+func nginxVersion() {
+	flag := "-v"
+
+	if glog.V(2) {
+		flag = "-V"
+	}
+
+	cmd := exec.Command("nginx", flag)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	cmd.Run()
+}