Merge

merge.go

func mergeIntoBaseArchive(baseArchive ArchiveInfo, basedir string, contents []string, file string) {
  var mapped map[string]bool
  mapped = make(map[string]bool)
  for _, item := range contents {
    stripped := strings.Replace(item, basedir, "", 1)
    mapped[stripped] = true
  }

  // tar pntr for copy
  dupe, dupeErr := os.Create(file)
  if (dupeErr != nil) {
    panic(dupeErr)
  }

  basePntr, baseErr := os.Open(baseArchive.Path)
  if (baseErr != nil) {
    panic(baseErr)
  }

  for _, item := range baseArchive.Items {
    _, posErr := basePntr.Seek(item.Start, 0)
    if (posErr != nil) {
      log.Fatalln(posErr)
    }
    io.CopyN(dupe, basePntr, item.Length)
  }

  basePntr.Close()
  dupe.Close()
}