How can I put a tar file inside tar file in golang

Supriya Published at

supriya :

I want to create a tar file and inside that tar file I want to put other tar files.Hierarchy is something like

TopLevelTar.tar.gz
    |-->primary/primary.tar
    |-->secondary/secondaty.tar
    |-->tertiary/tertiary.tar

How can I do it in golag?

shivendra pratap singh :

I think this might help you. Basically, this solution is creating a tarball from multiple files. You have to simply give path of your files in place of a.go and b.go etc.

package main

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

func addFile(tw *tar.Writer, path string) error {
    file, err := os.Open(path)
    if err != nil {
        return err
    }
    defer file.Close()
    if stat, err := file.Stat(); err == nil {
        // now lets create the header as needed for this file within the tarball
        header := new(tar.Header)
        header.Name = path
        header.Size = stat.Size()
        header.Mode = int64(stat.Mode())
        header.ModTime = stat.ModTime()
        // write the header to the tarball archive
        if err := tw.WriteHeader(header); err != nil {
            return err
        }
        // copy the file data to the tarball
        if _, err := io.Copy(tw, file); err != nil {
            return err
        }
    }
    return nil
}

func main() {
    // set up the output file
    file, err := os.Create("output.tar.gz")
    if err != nil {
        log.Fatalln(err)
    }
    defer file.Close()
    // set up the gzip writer
    gw := gzip.NewWriter(file)
    defer gw.Close()
    tw := tar.NewWriter(gw)
    defer tw.Close()
    // grab the paths that need to be added in
    paths := []string{
        "a.go",
        "b.go",
    }
    // add each file as needed into the current tar archive
    for i := range paths {
        if err := addFile(tw, paths[i]); err != nil {
            log.Fatalln(err)
        }
    }
}

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