crashpad/test/scoped_temp_dir_win.cc

// Copyright 2015 The Crashpad Authors
//
// 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.

#include "test/scoped_temp_dir.h"

#include <wchar.h>
#include <windows.h>

#include <string>

#include "base/check.h"
#include "base/strings/stringprintf.h"
#include "base/strings/utf_string_conversions.h"
#include "gtest/gtest.h"
#include "util/misc/random_string.h"

namespace crashpad {
namespace test {

namespace {

base::FilePath GenerateCandidateName() {
  wchar_t temp_path[MAX_PATH + 1];
  DWORD path_len = GetTempPath(MAX_PATH, temp_path);
  PCHECK(path_len != 0) << "GetTempPath";
  base::FilePath system_temp_dir(temp_path);
  std::wstring new_dir_name = base::UTF8ToWide(base::StringPrintf(
      "crashpad.test.%lu.%s", GetCurrentProcessId(), RandomString().c_str()));
  return system_temp_dir.Append(new_dir_name);
}

constexpr int kRetries = 50;

}  // namespace

void ScopedTempDir::Rename() {
  for (int count = 0; count < kRetries; ++count) {
    // Try to move to a new temporary directory with a randomly generated name.
    // If the one we try exists, retry with a new name until we reach some
    // limit.
    base::FilePath target_path = GenerateCandidateName();
    if (MoveFileEx(path_.value().c_str(), target_path.value().c_str(), 0)) {
      path_ = target_path;
      return;
    }
  }

  CHECK(false) << "Couldn't move to a new unique temp dir";
}

// static
base::FilePath ScopedTempDir::CreateTemporaryDirectory() {
  for (int count = 0; count < kRetries; ++count) {
    // Try to create a new temporary directory with random generated name. If
    // the one we generate exists, keep trying another path name until we reach
    // some limit.
    base::FilePath path_to_create = GenerateCandidateName();
    if (CreateDirectory(path_to_create.value().c_str(), nullptr))
      return path_to_create;
  }

  CHECK(false) << "Couldn't create a new unique temp dir";
  return base::FilePath();
}

}  // namespace test
}  // namespace crashpad