From 67a518b70c76c9d55b0f551f76d3c999f05377d1 Mon Sep 17 00:00:00 2001
From: Tibor Vass <teabee89@gmail.com>
Date: Wed, 30 Jul 2014 10:20:52 -0400
Subject: [PATCH] Make --attach case-insensitive

Docker-DCO-1.1-Signed-off-by: Tibor Vass <teabee89@gmail.com> (github: tiborvass)
---
 opts/opts.go | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/opts/opts.go b/opts/opts.go
index 43bef37068..bfee2ad217 100644
--- a/opts/opts.go
+++ b/opts/opts.go
@@ -87,10 +87,13 @@ func (opts *ListOpts) Len() int {
 type ValidatorFctType func(val string) (string, error)
 
 func ValidateAttach(val string) (string, error) {
-	if val != "stdin" && val != "stdout" && val != "stderr" {
-		return val, fmt.Errorf("Unsupported stream name: %s", val)
+	s := strings.ToLower(val)
+	for _, str := range []string{"stdin", "stdout", "stderr"} {
+		if s == str {
+			return s, nil
+		}
 	}
-	return val, nil
+	return val, fmt.Errorf("valid streams are STDIN, STDOUT and STDERR.")
 }
 
 func ValidateLink(val string) (string, error) {