func ConfigAndEnvProcessing() error {
	configPath := filepath.Dir(root.IstioConfig)
	baseName := filepath.Base(root.IstioConfig)
	configType := filepath.Ext(root.IstioConfig)
	configName := baseName[0 : len(baseName)-len(configType)]
	if configType != "" {
		configType = configType[1:]
	}

	// Allow users to override some variables through $HOME/.istioctl/config.yaml
	// and environment variables.
	viper.SetEnvPrefix("ISTIOCTL")

settings (--set meshConfig.enableTracing=true). See documentation for more info:` + url.IstioOperatorSpec
	// ManifestsFlagHelpStr is the command line description for --manifests
	ManifestsFlagHelpStr = `Specify a path to a directory of charts and profiles
(e.g. ~/Downloads/istio-` + baseVersion + `/manifests).
`
)

const (

		AmbientEnabled:    viper.GetBool(constants.AmbientEnabled),
		AmbientDNSCapture: viper.GetBool(constants.AmbientDNSCapture),
		AmbientIPv6:       viper.GetBool(constants.AmbientIPv6),
	}

	if len(installCfg.K8sNodeName) == 0 {
		var err error
		installCfg.K8sNodeName, err = os.Hostname()
		if err != nil {
			return nil, err
		}
	}

	repairCfg := config.RepairConfig{