From 27a6fe514690d06c0424e59421dcc02445ad36a7 Mon Sep 17 00:00:00 2001
From: Tibor Vass <tibor@docker.com>
Date: Thu, 6 Sep 2018 20:18:07 +0000
Subject: [PATCH] pkg/progress: work around closing closed channel panic

I could not reproduce the panic in #37735, so here's a bandaid.

Signed-off-by: Tibor Vass <tibor@docker.com>
(cherry picked from commit 7dac70324d0ce6acd23458b0bef06f099837d648)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Upstream-commit: 2c26eac56628527ed64c79ce9145ed97583cbeca
Component: engine
---
 components/engine/pkg/progress/progress.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/components/engine/pkg/progress/progress.go b/components/engine/pkg/progress/progress.go
index 9aea591954..32300914eb 100644
--- a/components/engine/pkg/progress/progress.go
+++ b/components/engine/pkg/progress/progress.go
@@ -39,6 +39,10 @@ type Output interface {
 type chanOutput chan<- Progress
 
 func (out chanOutput) WriteProgress(p Progress) error {
+	// FIXME: workaround for panic in #37735
+	defer func() {
+		recover()
+	}()
 	out <- p
 	return nil
 }