Extracting a tar file from a .tgz file - go

Question

i have some issue with the package archive/tar.
Using the tarReader.Next() he recognize a file that should be considered as a file as a directory. The issue with that is the fact that it's a .tar file in it and i need it as a file to process it as well.
The fragment of code that recognize the file
header, err := tarReader.Next()
fmt.Println(header.Typeflag)
if err == io.EOF {
break
}
if err != nil {
fmt.Println(err)
os.Exit(1)
}
name := header.Name
fmt.Println(name)
Files:
file.tgz
-file.tar
--other files
Here is the full function
package main
import (
"archive/tar"
"compress/gzip"
"flag"
"fmt"
"io"
"io/ioutil"
"os"
)
func main() {
// get the arguments from the command line
flag.Int("n", 4, "an integer")
flag.Parse()
sourceFile := flag.Arg(0)
if sourceFile == "" {
fmt.Println("Dude, you didn't pass in a tar file!")
os.Exit(1)
}
fmt.Println("arg 1: ", flag.Arg(0))
processFile(sourceFile)
}
// ReadPackedFile is a function to unpack a tar.gz
func ReadPackedFile(filepath string) {
if filepath == "" {
panic("Empty input!")
}
processFile(filepath)
}
func processFile(srcFile string) {
f, err := os.Open(srcFile)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
defer f.Close()
gzf, err := gzip.NewReader(f)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
tarReader := tar.NewReader(gzf)
// defer io.Copy(os.Stdout, tarReader)
for true {
header, err := tarReader.Next()
fmt.Println(header.Typeflag)
if err == io.EOF {
break
}
if err != nil {
fmt.Println(err)
os.Exit(1)
}
name := header.Name
fmt.Println(name)
switch header.Typeflag {
case tar.TypeDir: // = directory
fmt.Println("Directory:", name)
os.Mkdir(name, 0755)
case tar.TypeReg: // = regular file
fmt.Println("Regular file:", name)
data := make([]byte, header.Size)
_, err := tarReader.Read(data)
if err != nil {
panic("Error reading file!!! PANIC!!!!!!")
}
ioutil.WriteFile(name, data, 0755)
default:
fmt.Printf("%s : %c %s %s\n",
"Yikes! Unable to figure out type",
header.Typeflag,
"in file",
name,
)
}
}
}
The error given by the console
PS C:\Users\ErikT\Workspace\Misc\pen\htmltag> go run .\main.go .\dragontail-12.14.1.tgz
arg 1: .\dragontail-12.14.1.tgz
53
/
Directory: /
53
12.14.1/
Directory: 12.14.1/
53
12.14.1/css/
Directory: 12.14.1/css/
48
12.14.1/css/view.css
Regular file: 12.14.1/css/view.css
panic: Error reading file!!! PANIC!!!!!!
goroutine 1 [running]:
main.processFile({0xc000014108?, 0xc000006018?})
C:/Users/ErikT/Workspace/Misc/pen/htmltag/main.go:83 +0x60c
main.main()
C:/Users/ErikT/Workspace/Misc/pen/htmltag/main.go:27 +0x1a7
exit status 2