//  Copyright (c) Meta Platforms, Inc. and affiliates.

//

//  This source code is licensed under both the GPLv2 (found in the

//  COPYING file in the root directory) and Apache 2.0 License

//  (found in the LICENSE.Apache file in the root directory).

#include "db/manifest_ops.h"

#include "file/filename.h"

namespace ROCKSDB_NAMESPACE {

Status GetCurrentManifestPath(const std::string& dbname, FileSystem* fs,

                              bool is_retry, std::string* manifest_path,

                              uint64_t* manifest_file_number) {

  assert(fs != nullptr);

  assert(manifest_path != nullptr);

  assert(manifest_file_number != nullptr);

  IOOptions opts;

  std::string fname;

  if (is_retry) {

    opts.verify_and_reconstruct_read = true;

  }

  Status s = ReadFileToString(fs, CurrentFileName(dbname), opts, &fname);

  if (!s.ok()) {

    return s;

  }

  if (fname.empty() || fname.back() != '\n') {

    return Status::Corruption("CURRENT file does not end with newline");

  }

  // remove the trailing '\n'

  fname.resize(fname.size() - 1);

  FileType type;

  bool parse_ok = ParseFileName(fname, manifest_file_number, &type);

  if (!parse_ok || type != kDescriptorFile) {

    return Status::Corruption("CURRENT file corrupted");

  }

  *manifest_path = dbname;

  if (dbname.back() != '/') {

    manifest_path->push_back('/');

  }

  manifest_path->append(fname);

  return Status::OK();

}

}  // namespace ROCKSDB_NAMESPACE