Bazel client, Windows, tests: `rm -rf TEST_TMPDIR`

Add test helpers to recursively delete the
TEST_TMPDIR in the TearDown method of tests, to
ensure each test sees a fresh temp directory.

Also add tests for these test helpers.

--
PiperOrigin-RevId: 147135561
MOS_MIGRATED_REVID=147135561

1 files changed, 104 insertions, 0 deletions

diff --git a/src/test/cpp/util/windows_test_util.cc b/src/test/cpp/util/windows_test_util.cc
new file mode 100644
index 0000000000..dfea7b05bb
--- /dev/null
+++ b/src/test/cpp/util/windows_test_util.cc
@@ -0,0 +1,104 @@
+// Copyright 2016 The Bazel Authors. All rights reserved.
+//
+// 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 <windows.h>
+
+#include <algorithm>
+#include <memory>
+#include <string>
+
+#include "src/test/cpp/util/windows_test_util.h"
+
+#if !defined(COMPILER_MSVC) && !defined(__CYGWIN__)
+#error("This test should only be run on Windows")
+#endif  // !defined(COMPILER_MSVC) && !defined(__CYGWIN__)
+
+namespace blaze_util {
+
+using std::unique_ptr;
+using std::wstring;
+
+wstring GetTestTmpDirW() {
+  DWORD size = ::GetEnvironmentVariableW(L"TEST_TMPDIR", NULL, 0);
+  unique_ptr<WCHAR[]> buf(new WCHAR[size]);
+  ::GetEnvironmentVariableW(L"TEST_TMPDIR", buf.get(), size);
+  wstring result(buf.get());
+  std::replace(result.begin(), result.end(), '/', '\\');
+  return result;
+}
+
+bool DeleteAllUnder(wstring path) {
+  static const wstring kDot(L".");
+  static const wstring kDotDot(L"..");
+
+  // Prepend UNC prefix if the path doesn't have it already. Don't bother
+  // checking if the path is shorter than MAX_PATH, let's just do it
+  // unconditionally; this is a test after all, performance isn't paramount.
+  if (path.find(L"\\\\?\\") != 0) {
+    path = wstring(L"\\\\?\\") + path;
+  }
+  // Append "\" if necessary.
+  if (path.back() != '\\') {
+    path.push_back('\\');
+  }
+
+  WIN32_FIND_DATAW metadata;
+  HANDLE handle = FindFirstFileW((path + L"*").c_str(), &metadata);
+  if (handle == INVALID_HANDLE_VALUE) {
+    return true;  // directory doesn't exist
+  }
+
+  bool result = true;
+  do {
+    wstring childname = metadata.cFileName;
+    if (kDot != childname && kDotDot != childname) {
+      wstring childpath = path + childname;
+      if ((metadata.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0) {
+        // If this is not a junction, delete its contents recursively.
+        // Finally delete this directory/junction too.
+        if (((metadata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) == 0 &&
+             !DeleteAllUnder(childpath)) ||
+            !::RemoveDirectoryW(childpath.c_str())) {
+          result = false;
+          break;
+        }
+      } else {
+        if (!::DeleteFileW(childpath.c_str())) {
+          result = false;
+          break;
+        }
+      }
+    }
+  } while (FindNextFileW(handle, &metadata));
+  FindClose(handle);
+  return result;
+}
+
+bool CreateDummyFile(const wstring& path) {
+  HANDLE handle =
+      ::CreateFileW(path.c_str(), GENERIC_WRITE, FILE_SHARE_READ, NULL,
+                    CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
+  if (handle == INVALID_HANDLE_VALUE) {
+    return false;
+  }
+  bool result = true;
+  DWORD actually_written = 0;
+  if (!::WriteFile(handle, "hello", 5, &actually_written, NULL) &&
+      actually_written != 5) {
+    result = false;
+  }
+  CloseHandle(handle);
+  return result;
+}
+
+}  // namespace blaze_util