Why am I getting a \'too many open files\' error when decompressing a tar.gz file in Go?

How to Decompress tar.gz File in Go

In this question, the user is attempting to decompress a file called file.tar.gz, which contains a folder, using Go. They have encountered an error stating "too many open files" when trying to create a file.

The provided code essentially extracts the contents of a tar.gz file, but there is a minor issue in the handling of regular files (TypeReg). The mistake lies in not closing the output file, outFile, after copying its contents. Failure to close the file gracefully results in the error "too many open files" because the file remains open even after the function returns.

To rectify this, we can modify the ExtractTarGz function to close the output file after copying its contents. Here is the updated code:

<code class="go">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() // Close the output file after copying its contents
        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>

The modified code includes a call to outFile.Close() to explicitly close the output file after copying its contents. This ensures that the file is properly closed and released, preventing the "too many open files" error.

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