예제 #1
0
파일: config.go 프로젝트: exekias/juju
// newValidConfig builds a new environConfig from the provided Config
// and returns it. This includes applying the provided defaults
// values, if any. The resulting config values are validated.
func newValidConfig(cfg *config.Config, defaults map[string]interface{}) (*environConfig, error) {
	// Any auth credentials handling should happen first...

	// Ensure that the provided config is valid.
	if err := config.Validate(cfg, nil); err != nil {
		return nil, errors.Trace(err)
	}

	// Apply the defaults and coerce/validate the custom config attrs.
	fixedDefaults, unset := adjustDefaults(cfg, defaults)
	cfg, err := cfg.Remove(unset)
	if err != nil {
		return nil, errors.Trace(err)
	}
	validated, err := cfg.ValidateUnknownAttrs(configFields, fixedDefaults)
	if err != nil {
		return nil, errors.Trace(err)
	}
	validCfg, err := cfg.Apply(validated)
	if err != nil {
		return nil, errors.Trace(err)
	}

	// Build the config.
	ecfg := newConfig(validCfg)

	// Update to defaults set via client config.
	clientCfg, err := ecfg.clientConfig()
	if err != nil {
		return nil, errors.Trace(err)
	}
	ecfg, err = ecfg.updateForClientConfig(clientCfg)
	if err != nil {
		return nil, errors.Trace(err)
	}

	// Do final (more complex, provider-specific) validation.
	if err := ecfg.validate(); err != nil {
		return nil, errors.Trace(err)
	}

	return ecfg, nil
}