implement things needed to run net/disk_cache/backend_unittest

base/file_util_linux.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/file_util.h"
 
 #include <fcntl.h>
 
 #include <string>
 #include <vector>
 
 #include "base/logging.h"
 #include "base/string_util.h"
 
 namespace file_util {
 
 const wchar_t kPathSeparator = L'/';
 
 bool GetTempDir(std::wstring* path) {
   const char* tmp = getenv("TMPDIR");
   if (tmp)
     *path = UTF8ToWide(tmp);
   else
     *path = L"/tmp";
   return true;
 }
 
+// Does not copy attributes, permissions, metadata etc.
 bool CopyFile(const std::wstring& from_path, const std::wstring& to_path) {
   int infile = open(WideToUTF8(from_path).c_str(), O_RDONLY);
   if (infile < 0)
     return false;
   
   int outfile = creat(WideToUTF8(to_path).c_str(), 0666);
   if (outfile < 0) {
     close(infile);
     return false;
   }
@@ skipping 26 matching lines @@
   }
 
   if (close(infile) < 0)
     result = false;
   if (close(outfile) < 0)
     result = false;
 
   return result;
 }
 
+// TODO: Make this function symlink-aware.
+// Does not copy attributes, permissions, metadata etc.
+bool CopyDirectory(const std::wstring& from_path, const std::wstring& to_path,
+                   bool recursive) {
+  if (!CreateDirectory(to_path)) {
+    return false;
+  }
+
+  FileEnumerator enumerator(from_path, false, FileEnumerator::FILES);
+  std::wstring path;
+  while ((path = enumerator.Next()) != L"") {
+    path = GetFilenameFromPath(path);
+    std::wstring from = from_path;
+    AppendToPath(&from, path);
+
+    std::wstring to = to_path;
+    AppendToPath(&to, path);
+
+    if (!CopyFile(from, to)) {
+      // If some files have been copied successfully they won't be deleted.
+      return false;
+    }
+  }
+
+  if (recursive) {
+    FileEnumerator enumerator(from_path, false, FileEnumerator::DIRECTORIES);
+    std::wstring path;
+    while ((path = enumerator.Next()) != L"") {
+      path = GetFilenameFromPath(path);
+      std::wstring from = from_path;
+      AppendToPath(&from, path);
+
+      std::wstring to = to_path;
+      AppendToPath(&to, path);
+
+      if (!CopyDirectory(from, to, true)) {
+        // If some files have been copied successfully they won't be deleted.
+        return false;
+      }
+    }
+  }
+
+  return true;
+}
+
 }  // namespace file_util