Tail jenkins console output in local console

jenkins_tail.go

package main

import (
	"flag"
	"fmt"
	"io/ioutil"
	"net/http"
	"net/url"
	"os"
	"strconv"
	"time"
)

func exit(err error, code int) {
	fmt.Println(err)
	os.Exit(code)
}

func main() {
	buildUrlPtr := flag.String("url", "", "URL of the jenkins build")
	userPtr := flag.String("user", "", "Jenkins username")
	tokenPtr := flag.String("token", "", "Jenkins user token")
	sleepPtr := flag.Int("sleep", 1, "Sleep time between calls")
	flag.Parse()

	sleep := *sleepPtr
	start := int64(0)
	stop := false
	client := &http.Client{}

	if *buildUrlPtr == "" || *userPtr == "" || *tokenPtr == "" {
		flag.PrintDefaults()
		os.Exit(1)
	}
	consolePath := fmt.Sprintf("%v/logText/progressiveText", *buildUrlPtr)

	httpReq, err := http.NewRequest("GET", consolePath, nil)
	if err != nil {
		exit(err, 1)
	}
	httpReq.SetBasicAuth(*userPtr, *tokenPtr)

	for !stop {
		q := url.Values{}
		q.Add("start", fmt.Sprintf("%d", start))
		httpReq.URL.RawQuery = q.Encode()

		resp, err := client.Do(httpReq)
		if resp.StatusCode > 399 {
			exit(err, 1)
		}
		for k, v := range resp.Header {
			if k == "X-Text-Size" {
				start, err = strconv.ParseInt(v[0], 0, 0)
				if err != nil {
					exit(err, 1)
				}
			}
		}
		moreData := resp.Header.Get("X-More-Data")
		if moreData == "" {
			stop = true
		}

		bytes, err := ioutil.ReadAll(resp.Body)
		if err != nil {
			exit(err, 1)
		}
		fmt.Printf("%s", bytes)

		time.Sleep(time.Duration(sleep) * time.Second)
	}
}