if isPresent(EnvKMSSecretKey) && os.Getenv(EnvKMSSecretKey) == "" {
		os.Unsetenv(EnvKMSSecretKey)
	}
	if isPresent(EnvKMSSecretKeyFile) {
		if filename := os.Getenv(EnvKMSSecretKeyFile); filename == "" {
			os.Unsetenv(EnvKMSSecretKeyFile)
		} else if _, err := os.Stat(filename); errors.Is(err, os.ErrNotExist) {
			os.Unsetenv(EnvKMSSecretKeyFile)
		}
	}

	// disable ENVs which interfere with tests.
	for _, env := range []string{
		crypto.EnvKMSAutoEncryption,
		config.EnvAccessKey,
		config.EnvSecretKey,
		config.EnvRootUser,
		config.EnvRootPassword,
	} {
		os.Unsetenv(env)
	}

	// Set as non-distributed.
	globalIsDistErasure = false

	// Disable printing console messages during tests.
	color.Output = io.Discard
	// Disable Error logging in testing.