How to Decompress tar.gz Files in Go Without Exceeding File Open Limits?

Decompressing tar.gz Files in Go

Decompressing tar.gz files in Go involves utilizing the archive/tar and compress/gzip packages. While a sample code was provided, it encountered issues related to file opening limits.

To address this, we propose an updated solution below, which modifies the way the output file is closed.

<code class="go">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)
}</code>

By closing the output file immediately after copying the contents from the tar reader, we free up file descriptor resources, which were previously causing the errors related to exceeding open file limits. This updated code should successfully decompress tar.gz files in Go.

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