"GIT_TRACE_CURL=1",
			"GIT_TRACE_CURL_NO_DATA=1",
			"GIT_REDACT_COOKIES=o,SSO,GSSO_Uberproxy")
	}

	return env
}

// homeEnvName returns the environment variable used by os.UserHomeDir
// to locate the user's home directory.
func homeEnvName() string {
	switch runtime.GOOS {
	case "windows":
		return "USERPROFILE"
	case "plan9":
		return "home"
	default:
		return "HOME"
	}
}

	}
	httpsURL, err := url.Parse(srv.HTTPS.URL)
	if err != nil {
		return nil, err
	}
	env := []string{
		pathEnvName() + "=" + testBin + string(filepath.ListSeparator) + os.Getenv(pathEnvName()),
		homeEnvName() + "=/no-home",
		"CCACHE_DISABLE=1", // ccache breaks with non-existent HOME
		"GOARCH=" + runtime.GOARCH,
		"TESTGO_GOHOSTARCH=" + goHostArch,
		"GOCACHE=" + testGOCACHE,
		"GOCOVERDIR=" + os.Getenv("GOCOVERDIR"),

	if tg.grepCountBoth(regexp.QuoteMeta(filepath.Join("testdata", "b", "src", "foo", "quxx"))+`$`) != 1 {
		t.Error(`go install foo/quxx expected error: .*testdata/b/src/foo/quxx`)
	}
}

func homeEnvName() string {
	switch runtime.GOOS {
	case "windows":
		return "USERPROFILE"
	case "plan9":
		return "home"
	default:
		return "HOME"
	}
}

func tempEnvName() string {