Update to latest developer build of Chromium using Go

chromeup.go

package main

import "net/http"
import "fmt"

import "os"
import "os/exec"

import "log"
import "io/ioutil"

func main() {
    const VERSION_URL =  "http://commondatastorage.googleapis.com/chromium-browser-continuous/Win/LAST_CHANGE"
    resp, err := http.Get(VERSION_URL)
    if err != nil {
        log.Fatal(err)
        // handle error
    }
    defer resp.Body.Close()
    body, err := ioutil.ReadAll(resp.Body)

    bstring := string(body)
    fmt.Println("Updating to Chromium build", bstring)

    installer_url := fmt.Sprintf("http://commondatastorage.googleapis.com/chromium-browser-continuous/Win/%s/mini_installer.exe", bstring)
    exe_resp, err := http.Get(installer_url)
    if err != nil {
        log.Fatal(err)
    }
    defer exe_resp.Body.Close()
    exe_bod, err := ioutil.ReadAll(exe_resp.Body)
    if err != nil {
        log.Fatal(err)
    }
    fmt.Println("Read", len(exe_bod), "bytes from", installer_url)
    outf, err := os.Create("mini_installer.exe")
    outf.Write(exe_bod)
    outf.Close()
    
    install := exec.Command("mini_installer")
    err = install.Run()
    if err != nil {
        log.Fatal(err)
    }
}