Golang Action.IndentedString方法代码示例

func main() {
	var (
		conf                                           client.Configuration
		cli                                            client.Client
		err                                            error
		op                                             mig.Operation
		a                                              mig.Action
		migrc, show, render, target, expiration, afile string
		printAndExit                                   bool
		verbose, showversion                           bool
		modargs                                        []string
		run                                            interface{}
	)
	defer func() {
		if e := recover(); e != nil {
			fmt.Fprintf(os.Stderr, "%v\n", e)
		}
	}()
	homedir := client.FindHomedir()
	fs := flag.NewFlagSet("mig flag", flag.ContinueOnError)
	fs.Usage = continueOnFlagError
	fs.BoolVar(&printAndExit, "p", false, "display action json that would be used and exit")
	fs.StringVar(&migrc, "c", homedir+"/.migrc", "alternative configuration file")
	fs.StringVar(&show, "show", "found", "type of results to show")
	fs.StringVar(&render, "render", "text", "results rendering mode")
	fs.StringVar(&target, "t", fmt.Sprintf("status='%s' AND mode='daemon'", mig.AgtStatusOnline), "action target")
	fs.StringVar(&expiration, "e", "300s", "expiration")
	fs.StringVar(&afile, "i", "/path/to/file", "Load action from file")
	fs.BoolVar(&verbose, "v", false, "Enable verbose output")
	fs.BoolVar(&showversion, "V", false, "Show version")

	// if first argument is missing, or is help, print help
	// otherwise, pass the remainder of the arguments to the module for parsing
	// this client is agnostic to module parameters
	if len(os.Args) < 2 || os.Args[1] == "help" || os.Args[1] == "-h" || os.Args[1] == "--help" {
		usage()
	}

	if showversion || (len(os.Args) > 1 && (os.Args[1] == "-V" || os.Args[1] == "version")) {
		fmt.Println(mig.Version)
		os.Exit(0)
	}

	// when reading the action from a file, go directly to launch
	if os.Args[1] == "-i" {
		err = fs.Parse(os.Args[1:])
		if err != nil {
			panic(err)
		}
		if afile == "/path/to/file" {
			panic("-i flag must take an action file path as argument")
		}
		a, err = mig.ActionFromFile(afile)
		if err != nil {
			panic(err)
		}
		fmt.Fprintf(os.Stderr, "[info] launching action from file, all flags are ignored\n")
		if printAndExit {
			actionstr, err := a.IndentedString()
			if err != nil {
				panic(err)
			}
			fmt.Fprintf(os.Stdout, "%v\n", actionstr)
			os.Exit(0)
		}
		goto readytolaunch
	}

	// arguments parsing works as follow:
	// * os.Args[1] must contain the name of the module to launch. we first verify
	//   that a module exist for this name and then continue parsing
	// * os.Args[2:] contains both global options and module parameters. We parse the
	//   whole []string to extract global options, and module parameters will be left
	//   unparsed in fs.Args()
	// * fs.Args() with the module parameters is passed as a string to the module parser
	//   which will return a module operation to store in the action
	op.Module = os.Args[1]
	if _, ok := modules.Available[op.Module]; !ok {
		panic("Unknown module " + op.Module)
	}

	// -- Ugly hack Warning --
	// Parse() will fail on the first flag that is not defined, but in our case module flags
	// are defined in the module packages and not in this program. Therefore, the flag parse error
	// is expected. Unfortunately, Parse() writes directly to stderr and displays the error to
	// the user, which confuses them. The right fix would be to prevent Parse() from writing to
	// stderr, since that's really the job of the calling program, but in the meantime we work around
	// it by redirecting stderr to null before calling Parse(), and put it back to normal afterward.
	// for ref, issue is at https://github.com/golang/go/blob/master/src/flag/flag.go#L793
	fs.SetOutput(os.NewFile(uintptr(87592), os.DevNull))
	err = fs.Parse(os.Args[2:])
	fs.SetOutput(nil)
	if err != nil {
		// ignore the flag not defined error, which is expected because
		// module parameters are defined in modules and not in main
		if len(err.Error()) > 30 && err.Error()[0:29] == "flag provided but not defined" {
			// requeue the parameter that failed
			modargs = append(modargs, err.Error()[31:])
		} else {
			// if it's another error, panic
//.........这里部分代码省略.........