Function loadConfigFile

cmd/controller/flags.go:175–199

loadConfigFile reads and parses a config file. Returns the parsed config and a set of keys that were present in the file. The keys set is used to determine which fields to merge (even if zero-valued).

(configFile string)

// Returns the parsed config and a set of keys that were present in the file.
// The keys set is used to determine which fields to merge (even if zero-valued).
func loadConfigFile(configFile string) (*config.Config, map[string]struct{}, error) {
	data, err := os.ReadFile(configFile)
	if err != nil {
		return nil, nil, fmt.Errorf("failed to read config file: %w", err)
	}

	// First pass: get the set of keys present in the file
	var rawMap map[string]any
	if err := yaml.Unmarshal(data, &rawMap); err != nil {
		return nil, nil, fmt.Errorf("failed to parse config file: %w", err)
	}

	keys := make(map[string]struct{})
	for k := range rawMap {
		keys[k] = struct{}{}
	}

	// Second pass: unmarshal into the config struct
	cfg := &config.Config{}
	if err := unmarshalConfigStrict(data, cfg); err != nil {
		return nil, nil, fmt.Errorf("failed to parse config file: %w", err)
	}

	return cfg, keys, nil
}

// unmarshalConfigStrict unmarshals YAML config data with support for time.Duration fields.
// It returns an error if the config contains unknown fields, ensuring the user is aware