migrations::anonymous_namespace{MigrationMgr.cpp} Namespace Reference

Functions
bool	rename_and_symlink_path (const std::filesystem::path &old_path, const std::filesystem::path &new_path)
bool	rename_and_symlink_file (const std::filesystem::path &base_path, const std::string &dir_name, const std::string &old_file_name, const std::string &new_file_name)

Function Documentation

bool migrations::anonymous_namespace{MigrationMgr.cpp}::rename_and_symlink_file	(	const std::filesystem::path &	base_path,
		const std::string &	dir_name,
		const std::string &	old_file_name,
		const std::string &	new_file_name
	)

Definition at line 263 of file MigrationMgr.cpp.

References rename_and_symlink_path().

Referenced by migrations::MigrationMgr::executeRebrandMigration().

                                                             {
  auto old_path = std::filesystem::canonical(base_path);
  auto new_path = std::filesystem::canonical(base_path);
  if (!dir_name.empty()) {
    old_path /= dir_name;
    new_path /= dir_name;
  }
  if (old_file_name.empty()) {
    throw std::runtime_error(
        "Unexpected error in rename_and_symlink_file: old_file_name is empty");
  }
  old_path /= old_file_name;

  if (new_file_name.empty()) {
    throw std::runtime_error(
        "Unexpected error in rename_and_symlink_file: new_file_name is empty");
  }
  new_path /= new_file_name;

  return rename_and_symlink_path(old_path, new_path);
}

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bool migrations::anonymous_namespace{MigrationMgr.cpp}::rename_and_symlink_path	(	const std::filesystem::path &	old_path,
		const std::filesystem::path &	new_path
	)

Definition at line 207 of file MigrationMgr.cpp.

Referenced by migrations::MigrationMgr::executeRebrandMigration(), and rename_and_symlink_file().

                                                                {
  bool file_updated{false};
  if (std::filesystem::exists(old_path)) {
    // Skip if we have already created a symlink for the old path.
    if (std::filesystem::is_symlink(old_path)) {
      if (std::filesystem::read_symlink(old_path) != new_path.filename()) {
        std::stringstream ss;
        ss << "Rebrand migration: Encountered an unexpected symlink at path: " << old_path
           << ". Symlink does not reference file: " << new_path.filename();
        throw std::runtime_error(ss.str());
      }
      if (!std::filesystem::exists(new_path)) {
        std::stringstream ss;
        ss << "Rebrand migration: Encountered symlink at legacy path: " << old_path
           << " but no corresponding file at new path: " << new_path;
        throw std::runtime_error(ss.str());
      }
    } else {
      if (std::filesystem::exists(new_path)) {
        std::stringstream ss;
        ss << "Rebrand migration: Encountered existing non-symlink files at the legacy "
              "path: "
           << old_path << " and new path: " << new_path;
        throw std::runtime_error(ss.str());
      }
      std::filesystem::rename(old_path, new_path);
      std::cout << "Rebrand migration: Renamed " << old_path << " to " << new_path
                << std::endl;
      file_updated = true;
    }
  }

  if (std::filesystem::exists(old_path)) {
    if (!std::filesystem::is_symlink(old_path)) {
      std::stringstream ss;
      ss << "Rebrand migration: An unexpected error occurred. A symlink should have been "
            "created at "
         << old_path;
      throw std::runtime_error(ss.str());
    }
    if (std::filesystem::read_symlink(old_path) != new_path.filename()) {
      std::stringstream ss;
      ss << "Rebrand migration: Encountered an unexpected symlink at path: " << old_path
         << ". Symlink does not reference file: " << new_path.filename();
      throw std::runtime_error(ss.str());
    }
  } else if (std::filesystem::exists(new_path)) {
    std::filesystem::create_symlink(new_path.filename(), old_path);
    std::cout << "Rebrand migration: Added symlink from " << old_path << " to "
              << new_path.filename() << std::endl;
    file_updated = true;
  }
  return file_updated;
}

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