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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/upgrade_detector/directory_monitor.h"
#include <memory>
#include <utility>
#include "base/base_paths.h"
#include "base/check.h"
#include "base/files/file_path.h"
#include "base/files/file_path_watcher.h"
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/memory/scoped_refptr.h"
#include "base/path_service.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/task_traits.h"
#include "base/task/thread_pool.h"
#include "build/build_config.h"
#include "chrome/browser/upgrade_detector/installed_version_monitor.h"
#if BUILDFLAG(IS_MAC)
#include "base/apple/bundle_locations.h"
#endif
namespace {
base::FilePath GetDefaultMonitorLocation() {
#if BUILDFLAG(IS_MAC)
return base::apple::OuterBundlePath();
#else
return base::PathService::CheckedGet(base::DIR_EXE);
#endif
}
} // namespace
DirectoryMonitor::DirectoryMonitor(base::FilePath install_dir)
: install_dir_(std::move(install_dir)) {
DCHECK(!install_dir_.empty());
}
DirectoryMonitor::~DirectoryMonitor() {
if (watcher_)
task_runner_->DeleteSoon(FROM_HERE, std::move(watcher_));
}
void DirectoryMonitor::Start(Callback on_change_callback) {
DCHECK(!watcher_);
task_runner_ = base::ThreadPool::CreateSequencedTaskRunner(
{base::TaskPriority::BEST_EFFORT,
base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN, base::MayBlock()});
watcher_ = std::make_unique<base::FilePathWatcher>();
#if BUILDFLAG(IS_MAC)
// The normal Watch risks triggering a macOS Catalina+ consent dialog, so use
// a trivial watch here.
const base::FilePathWatcher::Type watch_type =
base::FilePathWatcher::Type::kTrivial;
#else
const base::FilePathWatcher::Type watch_type =
base::FilePathWatcher::Type::kNonRecursive;
#endif
// Start the watcher on a background sequence, reporting a failure to start to
// |on_change_callback| on the caller's sequence. The watcher is given a
// trampoline that will run |on_change_callback| on the caller's sequence.
// base::Unretained is safe because the watcher instance lives on the target
// sequence and will be destroyed there in a subsequent task.
task_runner_->PostTaskAndReplyWithResult(
FROM_HERE,
base::BindOnce(
&base::FilePathWatcher::Watch, base::Unretained(watcher_.get()),
std::move(install_dir_), watch_type,
base::BindRepeating(
[](base::SequencedTaskRunner* main_sequence,
const Callback& on_change_callback, const base::FilePath&,
bool error) {
main_sequence->PostTask(
FROM_HERE, base::BindOnce(on_change_callback, error));
},
base::RetainedRef(base::SequencedTaskRunner::GetCurrentDefault()),
on_change_callback)),
base::BindOnce(
[](const Callback& on_change_callback, bool start_result) {
if (!start_result)
on_change_callback.Run(/*error=*/true);
},
on_change_callback));
}
// static
std::unique_ptr<InstalledVersionMonitor> InstalledVersionMonitor::Create() {
return std::make_unique<DirectoryMonitor>(GetDefaultMonitorLocation());
}
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