From e5f66de850af3302fbe378c8acded2b0fa55472c Mon Sep 17 00:00:00 2001
From: Elliott Beach <elliott2.71828@gmail.com>
Date: Fri, 29 Sep 2017 11:16:12 -0500
Subject: [PATCH] Support default value of $GOPATH (#532)

Add support for go1.8 of blank $GOPATH
---
 cobra/cmd/helpers.go | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/cobra/cmd/helpers.go b/cobra/cmd/helpers.go
index c5e261c..e5b37ec 100644
--- a/cobra/cmd/helpers.go
+++ b/cobra/cmd/helpers.go
@@ -18,6 +18,7 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"os/exec"
 	"path/filepath"
 	"strings"
 	"text/template"
@@ -31,7 +32,27 @@ func init() {
 	envGoPath := os.Getenv("GOPATH")
 	goPaths := filepath.SplitList(envGoPath)
 	if len(goPaths) == 0 {
-		er("$GOPATH is not set")
+		// Adapted from https://github.com/Masterminds/glide/pull/798/files.
+		// As of Go 1.8 the GOPATH is no longer required to be set. Instead there
+		// is a default value. If there is no GOPATH check for the default value.
+		// Note, checking the GOPATH first to avoid invoking the go toolchain if
+		// possible.
+
+		goExecutable := os.Getenv("COBRA_GO_EXECUTABLE")
+		if len(goExecutable) <= 0 {
+			goExecutable = "go"
+		}
+
+		out, err := exec.Command(goExecutable, "env", "GOPATH").Output()
+		if err != nil {
+			er(err)
+		}
+
+		toolchainGoPath := strings.TrimSpace(string(out))
+		goPaths = filepath.SplitList(toolchainGoPath)
+		if len(goPaths) == 0 {
+			er("$GOPATH is not set")
+		}
 	}
 	srcPaths = make([]string, 0, len(goPaths))
 	for _, goPath := range goPaths {