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// 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 "chrome/browser/chromeos/system/udev_info_provider.h"
#include "base/bind.h"
#include "base/command_line.h"
#include "base/lazy_instance.h"
#include "base/process_util.h"
#include "base/string_util.h"
#include "chrome/browser/chromeos/system/name_value_pairs_parser.h"
#include "content/public/browser/browser_thread.h"
using content::BrowserThread;
namespace chromeos {
namespace system {
namespace {
// Absolute path of the udevadm tool.
const char kUdevadmToolPath[] = "/sbin/udevadm";
// Key-value separator and string delimiter in output of "udevadm info".
const char kUdevadmEq[] = "=";
const char kUdevadmDelim[] = "\n";
const char kUdevadmCommentDelim[] = "";
} // namespace
class UdevInfoProviderImpl : public UdevInfoProvider {
public:
UdevInfoProviderImpl() {}
// UdevInfoProvider implementation.
virtual bool QueryDeviceProperty(const std::string& sys_path,
const std::string& property_name,
std::string* result) const OVERRIDE;
static UdevInfoProvider* GetInstance();
private:
DISALLOW_COPY_AND_ASSIGN(UdevInfoProviderImpl);
};
base::LazyInstance<UdevInfoProviderImpl> g_udev_info_provider =
LAZY_INSTANCE_INITIALIZER;
bool UdevInfoProviderImpl::QueryDeviceProperty(const std::string& sys_path,
const std::string& property_name,
std::string* result) const {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
const char* kUdevadmTool[] = {
kUdevadmToolPath,
"info",
"--path",
sys_path.c_str(),
"--query=property",
};
NameValuePairsParser::NameValueMap device_info;
NameValuePairsParser parser(&device_info);
if (!parser.ParseNameValuePairsFromTool(
arraysize(kUdevadmTool), kUdevadmTool, kUdevadmEq,
kUdevadmDelim, kUdevadmCommentDelim)) {
LOG(WARNING) << "There were errors parsing the output of "
<< kUdevadmToolPath << ".";
}
NameValuePairsParser::NameValueMap::const_iterator it =
device_info.find(property_name);
if (it == device_info.end())
return false;
*result = it->second;
return true;
}
UdevInfoProvider* UdevInfoProviderImpl::GetInstance() {
return &g_udev_info_provider.Get();
}
UdevInfoProvider* UdevInfoProvider::GetInstance() {
return UdevInfoProviderImpl::GetInstance();
}
} // namespace system
} // namespace chromeos
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