env GOVCS='private:all,public:none'
! go get github.com/google/go-cmp
stderr '^go: GOVCS disallows using git for public github.com/google/go-cmp; see ''go help vcs''$'

# other patterns work (for more patterns, see TestGOVCS)
env GOPRIVATE=
env GOVCS='github.com:svn|hg'
! go get github.com/google/go-cmp
stderr '^go: GOVCS disallows using git for public github.com/google/go-cmp; see ''go help vcs''$'

		// or they require our intercepted vcs-test.golang.org to regenerate the repository.
		// Require all tests that use VCS commands to be skipped in short mode.
		env = append(env, "TESTGOVCS=panic")
	}

	if os.Getenv("CGO_ENABLED") != "" || runtime.GOOS != goHostOS || runtime.GOARCH != goHostArch {
		// If the actual CGO_ENABLED might not match the cmd/go default, set it

		if !ok {
			muIface, _ = dirLock.LoadOrStore(dir, new(sync.Mutex))
		}
		mu := muIface.(*sync.Mutex)
		mu.Lock()
		defer mu.Unlock()
	}

	cmd := str.StringList(cmdline...)
	if os.Getenv("TESTGOVCS") == "panic" {
		panic(fmt.Sprintf("use of vcs: %v", cmd))
	}
	if xLog, ok := cfg.BuildXWriter(ctx); ok {
		text := new(strings.Builder)
		if dir != "" {
			text.WriteString("cd ")
			text.WriteString(dir)

	if tg.env == nil {
		tg.env = append([]string(nil), os.Environ()...)
		tg.env = append(tg.env, "GO111MODULE=off", "TESTGONETWORK=panic")
		if testing.Short() {
			tg.env = append(tg.env, "TESTGOVCS=panic")
		}
	}
	for i, v := range tg.env {
		if strings.HasPrefix(v, name+"=") {
			tg.env = append(tg.env[:i], tg.env[i+1:]...)
			break
		}
	}
}

func (tg *testgoData) goTool() string {