Refactor BaseFile methods to return a DownloadInterruptReason instead of a net::Error.

content/browser/download/base_file_posix.cc

+// Copyright (c) 2012 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 "content/browser/download/base_file.h"
+
+#include "base/file_util.h"
+#include "content/public/browser/download_interrupt_reasons.h"
+
+content::DownloadInterruptReason BaseFile::MoveFileAndAdjustPermissions(
+    const FilePath& new_path) {
+  // Similarly, on Unix, we're moving a temp file created with permissions 600
+  // to |new_path|. Here, we try to fix up the destination file with appropriate
+  // permissions.
+  struct stat st;
+  // First check the file existence and create an empty file if it doesn't
+  // exist.
+  if (!file_util::PathExists(new_path)) {
+    int write_error = file_util::WriteFile(new_path, "", 0);
+    if (write_error < 0)
+      return LogNetError("WriteFile", net::MapSystemError(errno));
+  }
+  int stat_error = stat(new_path.value().c_str(), &st);
+  bool stat_succeeded = (stat_error == 0);
+  if (!stat_succeeded)
+    LogNetError("stat", net::MapSystemError(errno));

[Randy Smith (Not in Mondays), 2012/10/23 20:18:13]

Why not logging the OS error directly here?  Given that we can just avoid doing
the extra translation?

[asanka, 2012/10/23 21:53:34]

We are logging the OS error as well now, although we still have an extra
conversion.

+
+  // TODO(estade): Move() falls back to copying and deleting when a simple
+  // rename fails. Copying sucks for large downloads. crbug.com/8737
+  if (!file_util::Move(full_path_, new_path))
+    return LogNetError("Move", net::MapSystemError(errno));
+
+  if (stat_succeeded) {
+    // On Windows file systems (FAT, NTFS), chmod fails.  This is OK.
+    int chmod_error = chmod(new_path.value().c_str(), st.st_mode);
+    if (chmod_error < 0)
+      LogNetError("chmod", net::MapSystemError(errno));
+  }
+  return content::DOWNLOAD_INTERRUPT_REASON_NONE;
+}