Endpoint that blocks until there are running builds

router/router.go

@@ -158,6 +158,10 @@ func Load(mux *httptreemux.ContextMux, middleware ...gin.HandlerFunc) http.Handl
 			session.MustAdmin(),
 			server.ResumeQueue,
 		)
+		queue.GET("/norunningbuilds",
+			session.MustAdmin(),
+			server.BlockTilQueueHasRunningItem,
+		)
 	}
 
 	auth := e.Group("/authorize")

server/hook.go

@@ -62,6 +62,16 @@ func ResumeQueue(c *gin.Context) {
 	c.Status(http.StatusOK)
 }
 
+func BlockTilQueueHasRunningItem(c *gin.Context) {
+	for {
+		info := Config.Services.Queue.Info(c)
+		if info.Stats.Running == 0 {
+			break
+		}
+	}
+	c.Status(http.StatusOK)
+}
+
 func PostHook(c *gin.Context) {
 	remote_ := remote.FromContext(c)