show-tar-header

show-tar-header.go

package main

import (
	"archive/tar"
	"flag"
	"fmt"
	"io"
	"os"
)

func main() {
	flag.Parse()

	var r io.Reader
	if flag.NArg() > 0 {
		fh, err := os.Open(flag.Args()[0])
		if err != nil {
			fmt.Fprintln(os.Stderr, err)
			os.Exit(1)
		}
		defer fh.Close()

		r = fh
	} else {
		r = os.Stdin
	}

	tR := tar.NewReader(r)
	for {
		var shouldBreak bool
		hdr, err := tR.Next()
		if err != nil && err != io.EOF {
			fmt.Fprintln(os.Stderr, err)
			os.Exit(1)
		}
		if err == io.EOF {
			shouldBreak = true
		}
		if hdr == nil {
			break
		}

		fmt.Printf("%#v\n", hdr)

		if shouldBreak {
			break
		}
	}
}