Function runLogin

cli/command/registry/login.go:150–187

(ctx context.Context, dockerCLI command.Cli, opts loginOptions)

}

func runLogin(ctx context.Context, dockerCLI command.Cli, opts loginOptions) error {
	if err := verifyLoginOptions(dockerCLI, &opts); err != nil {
		return err
	}

	maybePrintEnvAuthWarning(dockerCLI)

	var (
		serverAddress string
		msg           string
	)
	if opts.serverAddress != "" && opts.serverAddress != registry.DefaultNamespace {
		serverAddress = opts.serverAddress
	} else {
		serverAddress = registry.IndexServer
	}
	isDefaultRegistry := serverAddress == registry.IndexServer

	// attempt login with current (stored) credentials
	authConfig, err := command.GetDefaultAuthConfig(dockerCLI.ConfigFile(), opts.user == "" && opts.password == "", serverAddress, isDefaultRegistry)
	if err == nil && authConfig.Username != "" && authConfig.Password != "" {
		msg, err = loginWithStoredCredentials(ctx, dockerCLI, authConfig)
	}

	// if we failed to authenticate with stored credentials (or didn't have stored credentials),
	// prompt the user for new credentials
	if err != nil || authConfig.Username == "" || authConfig.Password == "" {
		msg, err = loginUser(ctx, dockerCLI, opts, authConfig.Username, authConfig.ServerAddress)
		if err != nil {
			return err
		}
	}

	if msg != "" {
		_, _ = fmt.Fprintln(dockerCLI.Out(), msg)
	}
	return nil
}

func loginWithStoredCredentials(ctx context.Context, dockerCLI command.Cli, authConfig registrytypes.AuthConfig) (msg string, _ error) {
	_, _ = fmt.Fprintf(dockerCLI.Err(), "Authenticating with existing credentials...")