publish.go

package main

import (
	"archive/tar"
	"compress/gzip"
	"crypto/md5"
	"fmt"
	"io"
	"log"
	"os"
	"path/filepath"

	"github.com/icub3d/gop/wrapio"
)

func main() {

	out, err := os.Create(os.Args[1])
	if err != nil {
		log.Fatalln("opening", os.Args[1], err)
	}
	defer out.Close()

	h := md5.New()
	hw := wrapio.NewHashWriter(h, out)
	gzw := gzip.NewWriter(hw)
	tw := tar.NewWriter(gzw)

	for _, path := range os.Args[2:] {
		err = filepath.Walk(path, func(path string, info os.FileInfo, err error) error {
			if info.IsDir() { // skip directories.
				return nil
			}

			// Open up the file
			f, err := os.Open(path)
			if err != nil {
				return err
			}
			defer f.Close()

			// Make the header and write it to the tarball.
			header := &tar.Header{
				Name:    path,
				Size:    info.Size(),
				Mode:    int64(info.Mode()),
				ModTime: info.ModTime(),
			}
			if err := tw.WriteHeader(header); err != nil {
				return err
			}

			// copy the file data to the tarball
			if _, err := io.Copy(tw, f); err != nil {
				return err
			}
			return nil
		})
		if err != nil {
			log.Println("walking:", err)
		}
	}

	tw.Close()
	gzw.Close()
	fmt.Printf("%x\n", h.Sum(nil))
}