From dfc3562e290a7eab071656e80720afc6c08f2bd1 Mon Sep 17 00:00:00 2001
From: Madhu Rajanna <madhupr007@gmail.com>
Date: Wed, 6 Nov 2019 10:22:07 +0530
Subject: [PATCH] Add Version flag to cephcsi

This will be helpful if someone wants
to check the cephcsi version

output
```
docker run quay.io/cephcsi/cephcsi:v1.2.1 --version
Cephcsi Version: v1.2.1
Git Commit: 4b871366327d63e27fc1abfb699f0faaf0fc16b9
GoVersion: go1.12.5
Compiler: gc
Platform: linux/amd64
```

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
---
 cmd/cephcsi.go   | 13 +++++++++++++
 pkg/util/util.go |  1 +
 2 files changed, 14 insertions(+)

diff --git a/cmd/cephcsi.go b/cmd/cephcsi.go
index 54bb89059..2e76b1c18 100644
--- a/cmd/cephcsi.go
+++ b/cmd/cephcsi.go
@@ -18,8 +18,10 @@ package main
 
 import (
 	"flag"
+	"fmt"
 	"os"
 	"path/filepath"
+	"runtime"
 	"time"
 
 	"github.com/ceph/ceph-csi/pkg/cephfs"
@@ -75,6 +77,8 @@ func init() {
 	flag.StringVar(&conf.HistogramOption, "histogramoption", "0.5,2,6",
 		"Histogram option for grpc metrics, should be comma separated value, ex:= 0.5,2,6 where start=0.5 factor=2, count=6")
 
+	flag.BoolVar(&conf.Version, "version", false, "Print cephcsi version information")
+
 	klog.InitFlags(nil)
 	if err := flag.Set("logtostderr", "true"); err != nil {
 		klog.Exitf("failed to set logtostderr flag: %v", err)
@@ -101,6 +105,15 @@ func getDriverName() string {
 }
 
 func main() {
+	if conf.Version {
+		fmt.Println("Cephcsi Version:", util.DriverVersion)
+		fmt.Println("Git Commit:", util.GitCommit)
+		fmt.Println("Go Version:", runtime.Version())
+		fmt.Println("Compiler:", runtime.Compiler)
+		fmt.Printf("Platform: %s/%s\n", runtime.GOOS, runtime.GOARCH)
+		os.Exit(0)
+	}
+
 	klog.Infof("Driver version: %s and Git version: %s", util.DriverVersion, util.GitCommit)
 	var cp util.CachePersister
 
diff --git a/pkg/util/util.go b/pkg/util/util.go
index 75cda5e95..27ba598a4 100644
--- a/pkg/util/util.go
+++ b/pkg/util/util.go
@@ -97,6 +97,7 @@ type Config struct {
 
 	IsControllerServer bool // if set to true start provisoner server
 	IsNodeServer       bool // if set to true start node server
+	Version            bool // cephcsi version
 
 	// rbd related flag
 	Containerized bool // whether run as containerized