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package main
import (
"archive/tar"
"io"
"log"
"os"
flag "github.com/spf13/pflag"
)
func main() {
var prefix string
var verbose int
flag.CountVarP(&verbose, "verbose", "v", "add verbosity")
flag.StringVarP(&prefix, "prefix", "p", "", "adds prefix to filenames")
flag.Parse()
if err := process(prefix, verbose); err != nil {
log.Fatal(err)
}
}
func process(prefix string, verbose int) error {
tr := tar.NewReader(os.Stdin)
tw := tar.NewWriter(os.Stdout)
defer tw.Close()
for {
hdr, err := tr.Next()
if err == io.EOF {
break
} else if err != nil {
return err
}
if verbose >= 1 {
log.Printf("file: %s", hdr.Name)
}
hdr.Name = prefix + hdr.Name
if err = tw.WriteHeader(hdr); err != nil {
return err
}
if _, err := io.Copy(tw, tr); err != nil {
return err
}
}
if err := tw.Flush(); err != nil {
return err
}
return nil
}
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