From ec9967ff11851facad48bb0c11639e52a77f79b9 Mon Sep 17 00:00:00 2001
From: Francisco Souza <franciscossouza@gmail.com>
Date: Thu, 13 Sep 2012 10:25:35 -0400
Subject: [PATCH] go/build: reject empty strings in Import

Fixes #3889.

R=rsc, adg
CC=golang-dev
https://golang.org/cl/6499102
---
 src/pkg/go/build/build.go      |  3 +++
 src/pkg/go/build/build_test.go | 13 +++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/src/pkg/go/build/build.go b/src/pkg/go/build/build.go
index a65ff437ab..53daa6db2f 100644
--- a/src/pkg/go/build/build.go
+++ b/src/pkg/go/build/build.go
@@ -351,6 +351,9 @@ func (ctxt *Context) Import(path string, srcDir string, mode ImportMode) (*Packa
 	p := &Package{
 		ImportPath: path,
 	}
+	if path == "" {
+		return p, fmt.Errorf("import %q: invalid import path", path)
+	}
 
 	var pkga string
 	var pkgerr error
diff --git a/src/pkg/go/build/build_test.go b/src/pkg/go/build/build_test.go
index caa4f26f33..d8cf98840d 100644
--- a/src/pkg/go/build/build_test.go
+++ b/src/pkg/go/build/build_test.go
@@ -61,6 +61,19 @@ func TestDotSlashImport(t *testing.T) {
 	}
 }
 
+func TestEmptyImport(t *testing.T) {
+	p, err := Import("", Default.GOROOT, FindOnly)
+	if err == nil {
+		t.Fatal(`Import("") returned nil error.`)
+	}
+	if p == nil {
+		t.Fatal(`Import("") returned nil package.`)
+	}
+	if p.ImportPath != "" {
+		t.Fatalf("ImportPath=%q, want %q.", p.ImportPath, "")
+	}
+}
+
 func TestLocalDirectory(t *testing.T) {
 	cwd, err := os.Getwd()
 	if err != nil {
-- 
2.48.1