func ExportAppendChain(chainmgr *core.ChainManager, fn string, first uint64, last uint64) error { glog.Infoln("Exporting blockchain to", fn) // TODO verify mode perms fh, err := os.OpenFile(fn, os.O_CREATE|os.O_APPEND|os.O_WRONLY, os.ModePerm) if err != nil { return err } defer fh.Close() if err := chainmgr.ExportN(fh, first, last); err != nil { return err } glog.Infoln("Exported blockchain to", fn) return nil }