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// Copyright (c) 2011 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/files/file_path.h"
#include "base/files/scoped_temp_dir.h"
#include "base/gtest_prod_util.h"
#include "chrome/installer/util/work_item.h"
// A WorkItem subclass that recursively move a file system hierarchy from
// source path to destination path. The file system hierarchy could be a
// single file, or a directory.
// Under the cover MoveTreeWorkItem moves the destination path, if existing,
// to the temporary directory passed in, and then moves the source hierarchy
// to the destination location. During rollback the original destination
// hierarchy is moved back.
class MoveTreeWorkItem : public WorkItem {
~MoveTreeWorkItem() override;
friend class WorkItem;
// |source_path| specifies file or directory that will be moved to location
// specified by |dest_path|. To facilitate rollback, the caller needs to
// supply a temporary directory, |temp_dir| to save the original files if
// they exist under dest_path.
// If |check_duplicates| is CHECK_DUPLICATES, then Do() will first check
// whether the directory tree in source_path is entirely contained in
// dest_path and all files in source_path are present and of the same length
// in dest_path. If so, it will do nothing and return true, otherwise it will
// attempt to move source_path to dest_path as stated above.
MoveTreeWorkItem(const base::FilePath& source_path,
const base::FilePath& dest_path,
const base::FilePath& temp_dir,
MoveTreeOption duplicate_option);
// WorkItem:
bool DoImpl() override;
void RollbackImpl() override;
// Source path to move files from.
base::FilePath source_path_;
// Destination path to move files to.
base::FilePath dest_path_;
// Temporary directory to backup dest_path_ (if it already exists).
base::FilePath temp_dir_;
// The temporary directory into which the original dest_path_ has been moved.
base::ScopedTempDir backup_path_;
// Whether the source was moved to dest_path_
bool moved_to_dest_path_;
// Whether the original files have been moved to backup path under
// temporary directory. If true, moving back is needed during rollback.
bool moved_to_backup_;
// Whether we moved the source files to the backup path instead just to
// preserve the behaviour of a Move. This can only become true if
// duplicate_option_ is CHECK_DUPLICATES.
bool source_moved_to_backup_;
// Whether to check for duplicates before moving.
MoveTreeOption duplicate_option_;