From e7a5a3850f09d26ddb035a8da4d233efc6a81581 Mon Sep 17 00:00:00 2001
From: Jordi Masip <masipcat@users.noreply.github.com>
Date: Thu, 3 Dec 2020 18:02:18 +0100
Subject: [PATCH] cmd: add ability to read config from stdin (#3898)

---
 cmd/main.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/cmd/main.go b/cmd/main.go
index e92e71f6..2dfb8677 100644
--- a/cmd/main.go
+++ b/cmd/main.go
@@ -123,7 +123,11 @@ func loadConfig(configFile, adapterName string) ([]byte, string, error) {
 	var cfgAdapter caddyconfig.Adapter
 	var err error
 	if configFile != "" {
-		config, err = ioutil.ReadFile(configFile)
+		if configFile == "-" {
+			config, err = ioutil.ReadAll(os.Stdin)
+		} else {
+			config, err = ioutil.ReadFile(configFile)
+		}
 		if err != nil {
 			return nil, "", fmt.Errorf("reading config file: %v", err)
 		}