From 7cc42f2df843687139301d70d3e14c9c3e7582ef Mon Sep 17 00:00:00 2001
From: Manuel de Brito Fontes <aledbf@gmail.com>
Date: Wed, 25 Oct 2017 01:06:48 -0300
Subject: [PATCH] Add version flag

---
 deploy/README.md                 |  2 +-
 pkg/ingress/controller/launch.go |  9 +++++++++
 pkg/ingress/types.go             | 10 ++++++++++
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/deploy/README.md b/deploy/README.md
index a5bda3d67..bd2684326 100644
--- a/deploy/README.md
+++ b/deploy/README.md
@@ -183,5 +183,5 @@ To detect which version of the ingress controller is running, exec into the pod
 ```console
 POD_NAMESPACE=ingress-nginx
 POD_NAME=$(kubectl get pods -n $POD_NAMESPACE -l app=ingress-nginx -o jsonpath={.items[0].metadata.name})
-kubectl exec -it $POD_NAME -n $POD_NAMESPACE /nginx-ingress-controller version
+kubectl exec -it $POD_NAME -n $POD_NAMESPACE /nginx-ingress-controller --version
 ```
diff --git a/pkg/ingress/controller/launch.go b/pkg/ingress/controller/launch.go
index 57d0d253a..d7b6aef0f 100644
--- a/pkg/ingress/controller/launch.go
+++ b/pkg/ingress/controller/launch.go
@@ -104,6 +104,9 @@ func NewIngressController(backend ingress.Controller) *GenericController {
 
 		useNodeInternalIP = flags.Bool("report-node-internal-ip-address", false,
 			`Defines if the nodes IP address to be returned in the ingress status should be the internal instead of the external IP address`)
+
+		showVersion = flags.Bool("version", false,
+			`Shows release information about the NGINX Ingress controller`)
 	)
 
 	flags.AddGoFlagSet(flag.CommandLine)
@@ -112,6 +115,12 @@ func NewIngressController(backend ingress.Controller) *GenericController {
 	// Workaround for this issue:
 	// https://github.com/kubernetes/kubernetes/issues/17162
 	flag.CommandLine.Parse([]string{})
+
+	if *showVersion {
+		fmt.Println(backend.Info().String())
+		os.Exit(0)
+	}
+
 	backend.OverrideFlags(flags)
 
 	flag.Set("logtostderr", "true")
diff --git a/pkg/ingress/types.go b/pkg/ingress/types.go
index 840dc9b3d..37a552f97 100644
--- a/pkg/ingress/types.go
+++ b/pkg/ingress/types.go
@@ -17,6 +17,7 @@ limitations under the License.
 package ingress
 
 import (
+	"fmt"
 	"time"
 
 	"github.com/spf13/pflag"
@@ -130,6 +131,15 @@ type BackendInfo struct {
 	Repository string `json:"repository"`
 }
 
+func (bi BackendInfo) String() string {
+	return fmt.Sprintf(`
+Name:       %v
+Release:    %v
+Build:      %v
+Repository: %v
+`, bi.Name, bi.Release, bi.Build, bi.Repository)
+}
+
 // Configuration holds the definition of all the parts required to describe all
 // ingresses reachable by the ingress controller (using a filter by namespace)
 type Configuration struct {