Function cmdStart

cmd/commandfuncs.go:45–170

(fl Flags)

)

func cmdStart(fl Flags) (int, error) {
	configFlag := fl.String("config")
	configAdapterFlag := fl.String("adapter")
	pidfileFlag := fl.String("pidfile")
	watchFlag := fl.Bool("watch")

	var err error
	var envfileFlag []string
	envfileFlag, err = fl.GetStringSlice("envfile")
	if err != nil {
		return caddy.ExitCodeFailedStartup,
			fmt.Errorf("reading envfile flag: %v", err)
	}

	// open a listener to which the child process will connect when
	// it is ready to confirm that it has successfully started
	ln, err := listenTCPForPingback(net.Listen)
	if err != nil {
		return caddy.ExitCodeFailedStartup,
			fmt.Errorf("opening listener for success confirmation: %v", err)
	}
	defer ln.Close()

	// craft the command with a pingback address and with a
	// pipe for its stdin, so we can tell it our confirmation
	// code that we expect so that some random port scan at
	// the most unfortunate time won't fool us into thinking
	// the child succeeded (i.e. the alternative is to just
	// wait for any connection on our listener, but better to
	// ensure it's the process we're expecting - we can be
	// sure by giving it some random bytes and having it echo
	// them back to us)
	cmd := exec.Command(os.Args[0], "run", "--pingback", ln.Addr().String()) //nolint:gosec // no command injection that I can determine...
	// we should be able to run caddy in relative paths
	if errors.Is(cmd.Err, exec.ErrDot) {
		cmd.Err = nil
	}
	if configFlag != "" {
		cmd.Args = append(cmd.Args, "--config", configFlag)
	}

	for _, envfile := range envfileFlag {
		cmd.Args = append(cmd.Args, "--envfile", envfile)
	}
	if configAdapterFlag != "" {
		cmd.Args = append(cmd.Args, "--adapter", configAdapterFlag)
	}
	if watchFlag {
		cmd.Args = append(cmd.Args, "--watch")
	}
	if pidfileFlag != "" {
		cmd.Args = append(cmd.Args, "--pidfile", pidfileFlag)
	}
	stdinPipe, err := cmd.StdinPipe()
	if err != nil {
		return caddy.ExitCodeFailedStartup,
			fmt.Errorf("creating stdin pipe: %v", err)
	}