From cf1809a64b2836ed048628d65a90cb55c9c44da5 Mon Sep 17 00:00:00 2001
From: radioinmyhead <xiaotongzh@qq.com>
Date: Tue, 21 Feb 2017 16:30:55 +0800
Subject: [PATCH] fix GOROOT

set goroot by runtime.GOROOT if goroot is empty
---
 g_docs.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/g_docs.go b/g_docs.go
index fbc22b3..d6c2df2 100644
--- a/g_docs.go
+++ b/g_docs.go
@@ -26,6 +26,7 @@ import (
 	"path/filepath"
 	"reflect"
 	"regexp"
+	"runtime"
 	"strconv"
 	"strings"
 	"unicode"
@@ -402,6 +403,9 @@ func analyseControllerPkg(localName, pkgpath string) {
 
 func isSystemPackage(pkgpath string) bool {
 	goroot := os.Getenv("GOROOT")
+	if goroot == "" {
+		goroot = runtime.GOROOT()
+	}
 	if goroot == "" {
 		logger.Fatalf("GOROOT environment variable is not set or empty")
 	}