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// Copyright (c) 2009 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/chromeos_version_loader.h"
#include "base/file_path.h"
#include "base/file_util.h"
#include "base/message_loop.h"
#include "base/string_util.h"
#include "base/thread.h"
#include "chrome/browser/browser_process.h"
// Beginning of line we look for that gives version number.
static const char kPrefix[] = "CHROMEOS_RELEASE_DESCRIPTION=";
// File to look for version number in.
static const char kPath[] = "/etc/lsb-release";
ChromeOSVersionLoader::ChromeOSVersionLoader() : backend_(new Backend()) {
}
ChromeOSVersionLoader::Handle ChromeOSVersionLoader::GetVersion(
CancelableRequestConsumerBase* consumer,
ChromeOSVersionLoader::GetVersionCallback* callback) {
if (!g_browser_process->file_thread()) {
// This should only happen if Chrome is shutting down, so we don't do
// anything.
return 0;
}
scoped_refptr<CancelableRequest<GetVersionCallback> > request(
new CancelableRequest<GetVersionCallback>(callback));
AddRequest(request, consumer);
g_browser_process->file_thread()->message_loop()->PostTask(
FROM_HERE,
NewRunnableMethod(backend_.get(), &Backend::GetVersion, request));
return request->handle();
}
// static
std::string ChromeOSVersionLoader::ParseVersion(const std::string& contents) {
// The file contains lines such as:
// XXX=YYY
// AAA=ZZZ
// Split the lines and look for the one that starts with kPrefix. The version
// file is small, which is why we don't try and be tricky.
std::vector<std::string> lines;
SplitString(contents, '\n', &lines);
for (size_t i = 0; i < lines.size(); ++i) {
if (StartsWithASCII(lines[i], kPrefix, false)) {
std::string version = lines[i].substr(std::string(kPrefix).size());
if (version.size() > 1 && version[0] == '"' &&
version[version.size() - 1] == '"') {
// Trim trailing and leading quotes.
version = version.substr(1, version.size() - 2);
}
return version;
}
}
return std::string();
}
void ChromeOSVersionLoader::Backend::GetVersion(
scoped_refptr<GetVersionRequest> request) {
if (request->canceled())
return;
std::string version;
std::string contents;
if (file_util::ReadFileToString(FilePath(kPath), &contents))
version = ParseVersion(contents);
request->ForwardResult(GetVersionCallback::TupleType(request->handle(),
version));
}
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