os/exec: LookPath on Unix shouldn't look in cwd when PATH is empty
R=golang-dev, dave, bradfitz
CC=golang-dev
https://golang.org/cl/7305053
diff --git a/src/pkg/os/exec/lp_unix_test.go b/src/pkg/os/exec/lp_unix_test.go
new file mode 100644
index 0000000..3cba13e
--- /dev/null
+++ b/src/pkg/os/exec/lp_unix_test.go
@@ -0,0 +1,52 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin freebsd linux netbsd openbsd
+
+package exec
+
+import (
+ "io/ioutil"
+ "os"
+ "testing"
+)
+
+func TestLookPathUnixEmptyPath(t *testing.T) {
+ tmp, err := ioutil.TempDir("", "TestLookPathUnixEmptyPath")
+ if err != nil {
+ t.Fatal("TempDir failed: ", err)
+ }
+ defer os.RemoveAll(tmp)
+ wd, err := os.Getwd()
+ if err != nil {
+ t.Fatal("Getwd failed: ", err)
+ }
+ err = os.Chdir(tmp)
+ if err != nil {
+ t.Fatal("Chdir failed: ", err)
+ }
+ defer os.Chdir(wd)
+
+ f, err := os.OpenFile("exec_me", os.O_CREATE|os.O_EXCL, 0700)
+ if err != nil {
+ t.Fatal("OpenFile failed: ", err)
+ }
+ defer f.Close()
+
+ pathenv := os.Getenv("PATH")
+ defer os.Setenv("PATH", pathenv)
+
+ err = os.Setenv("PATH", "")
+ if err != nil {
+ t.Fatal("Setenv failed: ", err)
+ }
+
+ path, err := LookPath("exec_me")
+ if err == nil {
+ t.Fatal("LookPath found exec_me in empty $PATH")
+ }
+ if path != "" {
+ t.Fatalf("LookPath path == %q when err != nil", path)
+ }
+}
