From a7569356c1b9353a427c267bb9f66b5ac9c57f4b Mon Sep 17 00:00:00 2001
From: Andrew Gaul <andrew@gaul.org>
Date: Fri, 13 Jan 2017 15:42:17 -0800
Subject: [PATCH] Add friendly error for missing cert or key

Previously compy failed with the confusing:

2017/01/13 15:34:38 open : no such file or directory
---
 compy.go | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/compy.go b/compy.go
index aaf87ea..3395b06 100644
--- a/compy.go
+++ b/compy.go
@@ -26,6 +26,14 @@ func main() {
 
 	p := proxy.New()
 
+	if (*ca == "") != (*caKey == "") {
+		log.Fatalln("must specify both CA certificate and key")
+	}
+
+	if (*cert == "") != (*key == "") {
+		log.Fatalln("must specify both certificate and key")
+	}
+
 	if *ca != "" {
 		if err := p.EnableMitm(*ca, *caKey); err != nil {
 			fmt.Println("not using mitm:", err)