From 12cb5676fb0c3437dd270a15f6a2ad5ab4d588c2 Mon Sep 17 00:00:00 2001
From: Brad Rydzewski <brad.rydzewski@gmail.com>
Date: Fri, 19 Apr 2019 17:27:24 -0700
Subject: [PATCH] error if cyclical pipeline dependency [ci skip]

---
 trigger/trigger.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/trigger/trigger.go b/trigger/trigger.go
index 3d0767c6..9d7fd214 100644
--- a/trigger/trigger.go
+++ b/trigger/trigger.go
@@ -276,6 +276,10 @@ func (t *triggerer) Trigger(ctx context.Context, repo *core.Repository, base *co
 		}
 	}
 
+	if dag.DetectCycles() {
+		return t.createBuildError(ctx, repo, base, "Error: Dependency cycle detected in Pipeline")
+	}
+
 	if len(matched) == 0 {
 		logger.Infoln("trigger: skipping build, no matching pipelines")
 		return nil, nil