interactive.go

package main

import (
        "fmt"
        "os"
        "os/exec"

        isatty "github.com/mattn/go-isatty"
)

func reExec(args ...string) error {
        cmd := exec.Command("/proc/self/exe", args...)
        cmd.Stdout = os.Stdout
        cmd.Stderr = os.Stderr
        cmd.Stdin = os.Stdin

        if err := cmd.Run(); err != nil {
                return fmt.Errorf("run command: %v", err)
        }
        return nil
}

// This program prints "Is Terminal"

func main() {
        if len(os.Args) > 1 && os.Args[1] == "reexec" {
                if isatty.IsTerminal(os.Stdout.Fd()) {
                        fmt.Fprintln(os.Stderr, "Is Terminal")
                } else {
                        fmt.Fprintln(os.Stderr, "Is Not Terminal")
                }
                return
        }

        if err := reExec("reexec"); err != nil {
                fmt.Fprintln(os.Stderr, err)
                os.Exit(2)
        }
}