func TestFixedGOROOT(t *testing.T) {
if runtime.GOOS == "plan9" {
t.Skipf("skipping plan9, it is inconsistent by allowing GOROOT to be updated by Setenv")
}
// Restore both the real GOROOT environment variable, and runtime's copies:
if orig, ok := syscall.Getenv("GOROOT"); ok {
defer syscall.Setenv("GOROOT", orig)
} else {
defer syscall.Unsetenv("GOROOT")
}
envs := runtime.Envs()
oldenvs := append([]string{}, envs...)
defer runtime.SetEnvs(oldenvs)
// attempt to reuse existing envs backing array.
want := runtime.GOROOT()
runtime.SetEnvs(append(envs[:0], "GOROOT="+want))
if got := runtime.GOROOT(); got != want {
t.Errorf(`initial runtime.GOROOT()=%q, want %q`, got, want)
}
if err := syscall.Setenv("GOROOT", "/os"); err != nil {
t.Fatal(err)
}
if got := runtime.GOROOT(); got != want {
t.Errorf(`after setenv runtime.GOROOT()=%q, want %q`, got, want)
}
if err := syscall.Unsetenv("GOROOT"); err != nil {
t.Fatal(err)
}
if got := runtime.GOROOT(); got != want {
t.Errorf(`after unsetenv runtime.GOROOT()=%q, want %q`, got, want)
}
}
// Unsetenv unsets a single environment variable.
func Unsetenv(key string) error {
return syscall.Unsetenv(key)
}
func Unsetenv(key string) error {
// This was added in Go 1.4.
return syscall.Unsetenv(key)
}