Golang : Unzip file

Go's standard library provides support for several archive file formats. Zip format is the most common standard of compressing file. It is easy to unzip zip file in Go. Below is the code to unzip a zip file.

gounzip.go

 package main

 import (
 "archive/zip"
 "flag"
 "fmt"
 "io"
 "os"
 "path/filepath"
 )

 func main() {

 flag.Parse() // get the arguments from command line

 zipfile := flag.Arg(0)

 if zipfile == "" {
 fmt.Println("Usage : gounzip sourcefile.zip")
 os.Exit(1)
 }

 reader, err := zip.OpenReader(zipfile)
 if err != nil {
 fmt.Println(err)
 os.Exit(1)
 }
 defer reader.Close()

 for _, f := range reader.Reader.File {

 zipped, err := f.Open()
 if err != nil {
 fmt.Println(err)
 os.Exit(1)
 }

 defer zipped.Close()

 // get the individual file name and extract the current directory
 path := filepath.Join("./", f.Name)

 if f.FileInfo().IsDir() {
 os.MkdirAll(path, f.Mode())
 fmt.Println("Creating directory", path)
 } else {
 writer, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE, f.Mode())

 if err != nil {
 fmt.Println(err)
 os.Exit(1)
 }

 defer writer.Close()

 if _, err = io.Copy(writer, zipped); err != nil {
 fmt.Println(err)
 os.Exit(1)
 }

 fmt.Println("Decompressing : ", path)

 }
 }
 }

Build the executable and

test out the ./gounzip somefile.zip

Sample out :

./gounzip v1.8.31.2-beta.zip

Creating directory ngx_pagespeed-1.8.31.2-beta

Decompressing : ngx_pagespeed-1.8.31.2-beta/.gitignore

Decompressing : ngx_pagespeed-1.8.31.2-beta/LICENSE

Decompressing : ngx_pagespeed-1.8.31.2-beta/README.md

Decompressing : ngx_pagespeed-1.8.31.2-beta/config

Decompressing : ngxpagespeed-1.8.31.2-beta/cppfeature

Creating directory ngx_pagespeed-1.8.31.2-beta/scripts

...

References:

golang zip

test zip