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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 "chrome/installer/util/move_tree_work_item.h"
#include <shlwapi.h>
#include "base/files/file_util.h"
#include "base/logging.h"
#include "chrome/installer/util/duplicate_tree_detector.h"
#include "chrome/installer/util/logging_installer.h"
MoveTreeWorkItem::~MoveTreeWorkItem() {
}
MoveTreeWorkItem::MoveTreeWorkItem(const base::FilePath& source_path,
const base::FilePath& dest_path,
const base::FilePath& temp_dir,
MoveTreeOption duplicate_option)
: source_path_(source_path),
dest_path_(dest_path),
temp_dir_(temp_dir),
duplicate_option_(duplicate_option),
moved_to_dest_path_(false),
moved_to_backup_(false),
source_moved_to_backup_(false) {
}
bool MoveTreeWorkItem::Do() {
if (!base::PathExists(source_path_)) {
LOG(ERROR) << source_path_.value() << " does not exist";
return false;
}
// If dest_path_ exists, we can do one of two things:
// 1) If the contents of src_path_are already fully contained in dest_path_
// then do nothing and return success. Fully contained means the full
// file structure with identical files is contained in dest_path_. For
// Chrome, if dest_path_ exists, this is expected to be the common case.
// 2) If the contents of src_path_ are NOT fully contained in dest_path_, we
// attempt to backup dest_path_ and replace it with src_path_. This will
// fail if files in dest_path_ are in use.
if (base::PathExists(dest_path_)) {
// Generate a backup path that can keep the original files under dest_path_.
if (!backup_path_.CreateUniqueTempDirUnderPath(temp_dir_)) {
PLOG(ERROR) << "Failed to get backup path in folder "
<< temp_dir_.value();
return false;
}
base::FilePath backup = backup_path_.path().Append(dest_path_.BaseName());
if (duplicate_option_ == CHECK_DUPLICATES) {
if (installer::IsIdenticalFileHierarchy(source_path_, dest_path_)) {
// The files we are moving are already present in the destination path.
// We most likely don't need to do anything. As such, just move the
// source files to the temp folder as backup.
if (base::Move(source_path_, backup)) {
source_moved_to_backup_ = true;
VLOG(1) << "Moved source " << source_path_.value()
<< " to backup path " << backup.value();
return true;
} else {
// We failed to move the source tree to the backup path. This is odd
// but just fall through and attempt the regular behaviour as well.
LOG(ERROR) << "Failed to backup source " << source_path_.value()
<< " to backup path " << backup.value()
<< " for duplicate trees. Trying regular Move instead.";
}
} else {
VLOG(1) << "Source path " << source_path_.value()
<< " differs from " << dest_path_.value()
<< ", updating now.";
}
}
if (base::Move(dest_path_, backup)) {
moved_to_backup_ = true;
VLOG(1) << "Moved destination " << dest_path_.value()
<< " to backup path " << backup.value();
} else {
PLOG(ERROR) << "failed moving " << dest_path_.value()
<< " to " << backup.value();
return false;
}
}
// Now move source to destination.
if (base::Move(source_path_, dest_path_)) {
moved_to_dest_path_ = true;
VLOG(1) << "Moved source " << source_path_.value()
<< " to destination " << dest_path_.value();
} else {
PLOG(ERROR) << "failed move " << source_path_.value()
<< " to " << dest_path_.value();
return false;
}
return true;
}
void MoveTreeWorkItem::Rollback() {
if (moved_to_dest_path_ && !base::Move(dest_path_, source_path_))
LOG(ERROR) << "Can not move " << dest_path_.value()
<< " to " << source_path_.value();
base::FilePath backup = backup_path_.path().Append(dest_path_.BaseName());
if (moved_to_backup_ && !base::Move(backup, dest_path_)) {
LOG(ERROR) << "failed move " << backup.value()
<< " to " << dest_path_.value();
}
if (source_moved_to_backup_ && !base::Move(backup, source_path_)) {
LOG(ERROR) << "Can not restore " << backup.value()
<< " to " << source_path_.value();
}
}
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