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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
var concatenate bool
flag.CountVarP(&verbose, "verbose", "v", "add verbosity")
flag.StringVarP(&prefix, "prefix", "p", "", "adds prefix to filenames")
flag.BoolVarP(&concatenate, "concatenate", "c", false, "concatenate tar archives")
flag.Parse()
logger := NewLogger(LevelEnum(verbose) + 2)
params := processParams{
prefix: prefix,
concatenate: concatenate,
}
if err := process(params, logger); err != nil {
log.Fatal(err)
}
}
type processParams struct {
prefix string
concatenate bool
}
func process(params processParams, logger *Logger) error {
tr := tar.NewReader(os.Stdin)
tw := tar.NewWriter(os.Stdout)
defer tw.Close()
for {
hdr, err := tr.Next()
if err == io.EOF {
if params.concatenate {
tr = tar.NewReader(os.Stdin)
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)
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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