Config: Add callback function to have message about setup in case of …

…preset change

fixes: #2859

pkg/crc/config/callbacks.go

@@ -18,6 +18,12 @@ func RequiresDeleteMsg(key string, _ interface{}) string {
 		"delete the CRC instance with 'crc delete' and start it with 'crc start'.", key)
 }
 
+func RequiresDeleteAndSetupMsg(key string, _ interface{}) string {
+	return fmt.Sprintf("Changes to configuration property '%s' are only applied when the CRC instance is created.\n"+
+		"If you already have a running CRC instance with different %s, then for this configuration change to take effect, "+
+		"delete the CRC instance with 'crc delete', setup it with `crc setup` and start it with 'crc start'.", key, key)
+}
+
 func SuccessfullyApplied(key string, value interface{}) string {
 	return fmt.Sprintf("Successfully configured %s to %s", key, cast.ToString(value))
 }

pkg/crc/config/settings.go

@@ -77,7 +77,7 @@ func RegisterSettings(cfg *Config) {
 	}
 
 	// Preset setting should be on top because CPUs/Memory config depend on it.
-	cfg.AddSetting(Preset, string(preset.OpenShift), validatePreset, RequiresDeleteMsg,
+	cfg.AddSetting(Preset, string(preset.OpenShift), validatePreset, RequiresDeleteAndSetupMsg,
 		fmt.Sprintf("Virtual machine preset (alpha feature - valid values are: %s or %s)", preset.Podman, preset.OpenShift))
 	// Start command settings in config
 	cfg.AddSetting(Bundle, defaultBundlePath(cfg), validateBundlePath, SuccessfullyApplied,