From 315f281d6d87e8e89197651dd7d46f34b8f07a53 Mon Sep 17 00:00:00 2001
From: Aaron Gable <aaron@letsencrypt.org>
Date: Mon, 1 Aug 2022 14:05:36 -0700
Subject: [PATCH] Publisher: abort if conflicting chains configured (#6266)

Fixes #6089
---
 cmd/boulder-publisher/main.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/cmd/boulder-publisher/main.go b/cmd/boulder-publisher/main.go
index 61a7748f0..dece97e1b 100644
--- a/cmd/boulder-publisher/main.go
+++ b/cmd/boulder-publisher/main.go
@@ -2,6 +2,7 @@ package notmain
 
 import (
 	"flag"
+	"fmt"
 	"os"
 	"runtime"
 
@@ -87,6 +88,9 @@ func main() {
 		cmd.FailOnError(err, "failed to load chain.")
 		issuer := chain[0]
 		id := issuer.NameID()
+		if _, exists := bundles[id]; exists {
+			cmd.Fail(fmt.Sprintf("Got multiple chains configured for issuer %q", issuer.Subject.CommonName))
+		}
 		bundles[id] = publisher.GetCTBundleForChain(chain)
 	}