if err != nil {
		if os.IsNotExist(err) { // ignore if file doesn't exist.
			return "", nil
		}
		return "", err
	}
	return string(bytes.TrimSpace(credBuf)), nil
}

func loadEnvVarsFromFiles() {
	if env.IsSet(config.EnvAccessKeyFile) {
		accessKey, err := readFromSecret(env.Get(config.EnvAccessKeyFile, ""))
		if err != nil {
			logger.Fatal(config.ErrInvalidCredentials(err),

		if err != nil {
			// We can only log here since we need globalConsoleSys initialized
			logger.Fatal(err, "invalid --logrorate-dir option")
		}
	})

	// Always load ENV variables from files first.
	loadEnvVarsFromFiles()

	// Handle early server environment vars
	serverHandleEarlyEnvVars()

	// Handle all server command args and build the disks layout
	bootstrapTrace("serverHandleCmdArgs", func() {