Timed go get -u -v g golang.org/x/vgo

main.go

package main

import (
   "bufio"
   "fmt"
   "io"
   "os"
   "os/exec"
   "time"
)

func main() {
   r, w := io.Pipe()

   cmd := exec.Command("go", "get", "-v", "-u", "golang.org/x/vgo")
   cmd.Stdout = w
   cmd.Stderr = w

   start := time.Now()
   scanner := bufio.NewScanner(r)

   go func() {
      if err := cmd.Run(); err != nil {
         panic(err)
      }
      w.Close()
   }()

   for scanner.Scan() {
      fmt.Printf("%5.2fs: %v\n", time.Now().Sub(start).Seconds(), scanner.Text())
   }
   if err := scanner.Err(); err != nil {
      fmt.Fprintln(os.Stderr, "reading standard input:", err)
   }
}