From af15ed35830ba83aa171da30740b7c847d4e0b68 Mon Sep 17 00:00:00 2001
From: Adrien Delorme <adrien.delorme@icloud.com>
Date: Mon, 6 May 2019 15:29:59 +0200
Subject: [PATCH] nil signals are probably just a cancellation in disguise

---
 command/build.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/command/build.go b/command/build.go
index 9fac4b9db..91b615ce0 100644
--- a/command/build.go
+++ b/command/build.go
@@ -38,6 +38,11 @@ func (c *BuildCommand) Run(args []string) int {
 	go func() {
 		select {
 		case sig := <-sigCh:
+			if sig == nil {
+				// context got cancelled and this closed chan probably
+				// triggered first
+				return
+			}
 			c.Ui.Error(fmt.Sprintf("Cancelling build after receiving %s", sig))
 			cancelBuildCtx()
 		case <-buildCtx.Done():