From 5a03d31e737fb9a0ded6bd53d3f31193b800cdcf Mon Sep 17 00:00:00 2001
From: Ma Shimiao <mashimiao.fnst@cn.fujitsu.com>
Date: Thu, 26 May 2016 17:25:44 +0800
Subject: [PATCH] validate/env: add env name begins with digit check

Signed-off-by: Ma Shimiao <mashimiao.fnst@cn.fujitsu.com>
---
 validate.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/validate.go b/validate.go
index 71837345f..cfc3b9f87 100644
--- a/validate.go
+++ b/validate.go
@@ -266,10 +266,13 @@ func envValid(env string) bool {
 	if len(items) < 2 {
 		return false
 	}
-	for _, ch := range strings.TrimSpace(items[0]) {
+	for i, ch := range strings.TrimSpace(items[0]) {
 		if !unicode.IsDigit(ch) && !unicode.IsLetter(ch) && ch != '_' {
 			return false
 		}
+		if i == 0 && unicode.IsDigit(ch) {
+			logrus.Warnf("Env %v: variable name beginning with digit is not recommended.", env)
+		}
 	}
 	return true
 }