From f5a5f8086c19ba6a4c6eafe89acca806334fa427 Mon Sep 17 00:00:00 2001
From: Julien Brochet <julien@aerialls.io>
Date: Fri, 4 Sep 2020 20:48:46 +0200
Subject: [PATCH] Add version cli argument

---
 README.md   | 2 ++
 exporter.go | 8 ++++++++
 2 files changed, 10 insertions(+)

diff --git a/README.md b/README.md
index ae8ec642..c25d7436 100644
--- a/README.md
+++ b/README.md
@@ -93,6 +93,8 @@ Usage of ./nginx-prometheus-exporter:
         An address or unix domain socket path to listen on for web interface and telemetry. The default value can be overwritten by LISTEN_ADDRESS environment variable. (default ":9113")
   -web.telemetry-path string
         A path under which to expose metrics. The default value can be overwritten by TELEMETRY_PATH environment variable. (default "/metrics")
+  -version
+        Display the NGINX exporter version. (default false)
 ```
 
 ### Exported Metrics
diff --git a/exporter.go b/exporter.go
index 88a8806c..68391362 100644
--- a/exporter.go
+++ b/exporter.go
@@ -264,6 +264,9 @@ For NGINX, the stub_status page must be available through the URI. For NGINX Plu
 	nginxRetries = flag.Uint("nginx.retries",
 		defaultNginxRetries,
 		"A number of retries the exporter will make on start to connect to the NGINX stub_status page/NGINX Plus API before exiting with an error. The default value can be overwritten by NGINX_RETRIES environment variable.")
+	displayVersion = flag.Bool("version",
+		false,
+		"Display the NGINX exporter version.")
 
 	// Custom command-line flags
 	timeout = createPositiveDurationFlag("nginx.timeout",
@@ -282,6 +285,11 @@ For NGINX, the stub_status page must be available through the URI. For NGINX Plu
 func main() {
 	flag.Parse()
 
+	if *displayVersion {
+		fmt.Printf("NGINX Prometheus Exporter Version=%v GitCommit=%v\n", version, gitCommit)
+		os.Exit(0)
+	}
+
 	log.Printf("Starting NGINX Prometheus Exporter Version=%v GitCommit=%v", version, gitCommit)
 
 	registry := prometheus.NewRegistry()