Function parseConfigFileParameter

cmd/cortex/main.go:225–243

Parse -config.file and -config.expand-env option via separate flag set, to avoid polluting default one and calling flag.Parse on it twice.

(args []string)

// Parse -config.file and -config.expand-env option via separate flag set, to avoid polluting default one and calling flag.Parse on it twice.
func parseConfigFileParameter(args []string) (configFile string, expandEnv bool) {
	// ignore errors and any output here. Any flag errors will be reported by main flag.Parse() call.
	fs := flag.NewFlagSet("", flag.ContinueOnError)
	fs.SetOutput(io.Discard)

	// usage not used in these functions.
	fs.StringVar(&configFile, configFileOption, "", "")
	fs.BoolVar(&expandEnv, configExpandENV, false, "")

	// Try to find -config.file and -config.expand-env option in the flags. As Parsing stops on the first error, eg. unknown flag, we simply
	// try remaining parameters until we find config flag, or there are no params left.
	// (ContinueOnError just means that flag.Parse doesn't call panic or os.Exit, but it returns error, which we ignore)
	for len(args) > 0 {
		_ = fs.Parse(args)
		args = args[1:]
	}

	return
}

// LoadConfig read YAML-formatted config from filename into cfg.
func LoadConfig(filename string, expandENV bool, cfg *cortex.Config) error {