From 15c8846153fb531ff40d139a5d20b8267b7153e7 Mon Sep 17 00:00:00 2001
From: Matt Joiner <anacrolix@gmail.com>
Date: Wed, 4 Nov 2020 16:34:31 +1100
Subject: [PATCH] mse/cmd/mse: Fail on missing subcommand

---
 mse/cmd/mse/main.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/mse/cmd/mse/main.go b/mse/cmd/mse/main.go
index c4311ca3..2d90398a 100644
--- a/mse/cmd/mse/main.go
+++ b/mse/cmd/mse/main.go
@@ -37,7 +37,7 @@ func mainErr() error {
 	}{
 		CryptoMethod: mse.AllSupportedCrypto,
 	}
-	arg.MustParse(&args)
+	p := arg.MustParse(&args)
 	if args.Dial != nil {
 		cn, err := net.Dial(args.Dial.Network, args.Dial.Address)
 		if err != nil {
@@ -72,6 +72,9 @@ func mainErr() error {
 		}
 		doStreaming(rw)
 	}
+	if p.Subcommand() == nil {
+		p.Fail("missing subcommand")
+	}
 	return nil
 }