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package main
import (
"archive/tar"
"bufio"
"io"
"log"
"os"
"path"
"github.com/klauspost/readahead"
flag "github.com/spf13/pflag"
)
type processParams struct {
prefix string
concatenate bool
cleanPath bool
}
func main() {
var verbose int
var params processParams
flag.CountVarP(&verbose, "verbose", "v", "add verbosity")
flag.StringVarP(¶ms.prefix, "prefix", "p", "", "adds prefix to filenames")
flag.BoolVarP(¶ms.concatenate, "concatenate", "c", false, "concatenate tar archives")
flag.BoolVarP(¶ms.cleanPath, "clean-path", "", false, "clean tar entry path")
flag.Parse()
logger := NewLogger(LevelEnum(verbose) + 2)
if err := process(params, logger); err != nil {
log.Fatal(err)
}
}
func process(params processParams, logger *Logger) error {
in := readahead.NewReader(os.Stdin)
defer in.Close()
out := bufio.NewWriter(os.Stdout)
defer out.Flush()
tr := tar.NewReader(in)
tw := tar.NewWriter(out)
defer tw.Close()
for {
hdr, err := tr.Next()
if err == io.EOF {
if params.concatenate {
tr = tar.NewReader(in)
hdr, err = tr.Next()
if err == io.EOF {
break
} else if err != nil {
return err
}
} else {
break
}
} else if err != nil {
return err
}
logger.Infof(`TarEntry.name = %s`, hdr.Name)
if params.cleanPath {
hdr.Name = path.Clean("/" + hdr.Name)[1:]
}
hdr.Name = params.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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