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.go b/src/pkg/os/exec/lp_unix.go
index 2163221..1d1ec07 100644
--- a/src/pkg/os/exec/lp_unix.go
+++ b/src/pkg/os/exec/lp_unix.go
@@ -42,6 +42,9 @@
return "", &Error{file, err}
}
pathenv := os.Getenv("PATH")
+ if pathenv == "" {
+ return "", &Error{file, ErrNotFound}
+ }
for _, dir := range strings.Split(pathenv, ":") {
if dir == "" {
// Unix shell semantics: path element "" means "."
