copyfile.hpp

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// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//  http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef __STOUT_OS_WINDOWS_COPYFILE_HPP__
#define __STOUT_OS_WINDOWS_COPYFILE_HPP__

#include <string>

#include <stout/error.hpp>
#include <stout/nothing.hpp>
#include <stout/path.hpp>
#include <stout/try.hpp>
#include <stout/windows.hpp>

#include <stout/internal/windows/longpath.hpp>


namespace os {

// Uses the `CopyFile` Windows API to perform a file copy.
// Unlike the POSIX implementation, we do not need to check if the
// source or destination are directories, because `CopyFile` only
// works on files.
//
// https://msdn.microsoft.com/en-us/library/windows/desktop/aa363851(v=vs.85).aspx
//
// NOLINT(whitespace/line_length)

inline Try<Nothing> copyfile(
    const std::string& source, const std::string& destination)
{
  if (!path::is_absolute(source)) {
    return Error("`source` was a relative path");
  }

  if (!path::is_absolute(destination)) {
    return Error("`destination` was a relative path");
  }

  if (!::CopyFileW(
          ::internal::windows::longpath(source).data(),
          ::internal::windows::longpath(destination).data(),
          // NOTE: This allows the destination to be overwritten if the
          // destination already exists, as is the case in the POSIX version of
          // `copyfile`.
          false)) {
    return WindowsError();
  }

  return Nothing();
}

} // namespace os {

#endif // __STOUT_OS_WINDOWS_COPYFILE_HPP__