How to decompress tar.gz file in go? [duplicate]

Question

I have a file called file.tar.gz and it has a folder inside. Using go I want to decompress it and save the folder in the current directory.

I've found these code on a forum but it doesn't work in my case.

package main

import (
    "archive/tar"
    "compress/gzip"
    "io"
    "log"
    "os"
)

func ExtractTarGz(gzipStream io.Reader) {
    uncompressedStream, err := gzip.NewReader(gzipStream)
    if err != nil {
        log.Fatal("ExtractTarGz: NewReader failed")
    }

    tarReader := tar.NewReader(uncompressedStream)

    for true {
        header, err := tarReader.Next()

        if err == io.EOF {
            break
        }

        if err != nil {
            log.Fatalf("ExtractTarGz: Next() failed: %s", err.Error())
        }

        switch header.Typeflag {
        case tar.TypeDir:
            if err := os.Mkdir(header.Name, 0755); err != nil {
                log.Fatalf("ExtractTarGz: Mkdir() failed: %s", err.Error())
            }
        case tar.TypeReg:
            outFile, err := os.Create(header.Name)
            if err != nil {
                log.Fatalf("ExtractTarGz: Create() failed: %s", err.Error())
            }
            defer outFile.Close()
            if _, err := io.Copy(outFile, tarReader); err != nil {
                log.Fatalf("ExtractTarGz: Copy() failed: %s", err.Error())
            }
        default:
            log.Fatalf(
                "ExtractTarGz: uknown type: %s in %s",
                header.Typeflag,
                header.Name)
        }
    }
}
func main() {
    r, err := os.Open("./file.tar.gz")
    if err != nil {
        log.Fatalf(err.Error())
    }
    ExtractTarGz(r)
}

It gives me the error:

ExtractTarGz: Create() failed: open go/pkg/linux_amd64_race/unicod/utf16.a: too many open files exit status 1 

Answer 1

package main

import (
    "archive/tar"
    "compress/gzip"
    "fmt"
    "io"
    "log"
    "os"
)

func ExtractTarGz(gzipStream io.Reader) {
    uncompressedStream, err := gzip.NewReader(gzipStream)
    if err != nil {
        log.Fatal("ExtractTarGz: NewReader failed")
    }

    tarReader := tar.NewReader(uncompressedStream)

    for true {
        header, err := tarReader.Next()

        if err == io.EOF {
            break
        }

        if err != nil {
            log.Fatalf("ExtractTarGz: Next() failed: %s", err.Error())
        }

        switch header.Typeflag {
        case tar.TypeDir:
            if err := os.Mkdir(header.Name, 0755); err != nil {
                log.Fatalf("ExtractTarGz: Mkdir() failed: %s", err.Error())
            }
        case tar.TypeReg:
            outFile, err := os.Create(header.Name)
            if err != nil {
                log.Fatalf("ExtractTarGz: Create() failed: %s", err.Error())
            }
            if _, err := io.Copy(outFile, tarReader); err != nil {
                log.Fatalf("ExtractTarGz: Copy() failed: %s", err.Error())
            }
            outFile.Close()

        default:
            log.Fatalf(
                "ExtractTarGz: uknown type: %s in %s",
                header.Typeflag,
                header.Name)
        }

    }
}
func main() {
    r, err := os.Open("./file.tar.gz")
    if err != nil {
        fmt.Println("error")
    }
    ExtractTarGz(r)
}