added git revision to the binary for debugging purposes

cmd/droned/drone.go

@@ -46,6 +46,9 @@ var (
 	// build will timeout after N milliseconds.
 	// this will default to 500 minutes (6 hours)
 	timeout time.Duration
+
+	// commit sha for the current build.
+	version string
 )
 
 func main() {
@@ -67,6 +70,9 @@ func main() {
 	setupStatic()
 	setupHandlers()
 
+	// debug
+	log.Printf("starting drone version %s on port %s\n", version, port)
+
 	// start webserver using HTTPS or HTTP
 	if sslcert != "" && sslkey != "" {
 		panic(http.ListenAndServeTLS(port, sslcert, sslkey, nil))