chrome/browser/chromeos/version_loader.cc

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/chromeos/version_loader.h"
   6
   7 #include <vector>
   8
   9 #include "base/file_path.h"
  10 #include "base/file_util.h"
  11 #include "base/message_loop.h"
  12 #include "base/string_split.h"
  13 #include "base/string_util.h"
  14 #include "base/stringprintf.h"
  15 #include "base/threading/thread.h"
  16 #include "base/time.h"
  17 #include "chrome/browser/browser_process.h"
  18 #include "content/public/browser/browser_thread.h"
  19
  20 using content::BrowserThread;
  21
  22 namespace chromeos {
  23
  24 // File to look for version number in.
  25 static const char kPathVersion[] = "/etc/lsb-release";
  26
  27 // File to look for firmware number in.
  28 static const char kPathFirmware[] = "/var/log/bios_info.txt";
  29
  30 VersionLoader::VersionLoader() : backend_(new Backend()) {}
  31
  32 VersionLoader::~VersionLoader() {}
  33
  34 // Beginning of line we look for that gives full version number.
  35 // Format: x.x.xx.x (Developer|Official build extra info) board info
  36 // static
  37 const char VersionLoader::kFullVersionPrefix[] =
  38     "CHROMEOS_RELEASE_DESCRIPTION=";
  39
  40 // Same but for short version (x.x.xx.x).
  41 // static
  42 const char VersionLoader::kVersionPrefix[] = "CHROMEOS_RELEASE_VERSION=";
  43
  44 // Beginning of line we look for that gives the firmware version.
  45 const char VersionLoader::kFirmwarePrefix[] = "version";
  46
  47 VersionLoader::Handle VersionLoader::GetVersion(
  48     CancelableRequestConsumerBase* consumer,
  49     const VersionLoader::GetVersionCallback& callback,
  50     VersionFormat format) {
  51   if (!BrowserThread::IsMessageLoopValid(BrowserThread::FILE)) {
  52     // This should only happen if Chrome is shutting down, so we don't do
  53     // anything.
  54     return 0;
  55   }
  56
  57   scoped_refptr<GetVersionRequest> request(new GetVersionRequest(callback));
  58   AddRequest(request, consumer);
  59
  60   BrowserThread::PostTask(
  61       BrowserThread::FILE,
  62       FROM_HERE,
  63       NewRunnableMethod(backend_.get(), &Backend::GetVersion, request, format));
  64   return request->handle();
  65 }
  66
  67 VersionLoader::Handle VersionLoader::GetFirmware(
  68     CancelableRequestConsumerBase* consumer,
  69     const VersionLoader::GetFirmwareCallback& callback) {
  70   if (!BrowserThread::IsMessageLoopValid(BrowserThread::FILE)) {
  71     // This should only happen if Chrome is shutting down, so we don't do
  72     // anything.
  73     return 0;
  74   }
  75
  76   scoped_refptr<GetFirmwareRequest> request(new GetFirmwareRequest(callback));
  77   AddRequest(request, consumer);
  78
  79   BrowserThread::PostTask(
  80       BrowserThread::FILE,
  81       FROM_HERE,
  82       NewRunnableMethod(backend_.get(), &Backend::GetFirmware, request));
  83   return request->handle();
  84 }
  85
  86 // static
  87 std::string VersionLoader::ParseVersion(const std::string& contents,
  88                                         const std::string& prefix) {
  89   // The file contains lines such as:
  90   // XXX=YYY
  91   // AAA=ZZZ
  92   // Split the lines and look for the one that starts with prefix. The version
  93   // file is small, which is why we don't try and be tricky.
  94   std::vector<std::string> lines;
  95   base::SplitString(contents, '\n', &lines);
  96   for (size_t i = 0; i < lines.size(); ++i) {
  97     if (StartsWithASCII(lines[i], prefix, false)) {
  98       std::string version = lines[i].substr(std::string(prefix).size());
  99       if (version.size() > 1 && version[0] == '"' &&
 100           version[version.size() - 1] == '"') {
 101         // Trim trailing and leading quotes.
 102         version = version.substr(1, version.size() - 2);
 103       }
 104       return version;
 105     }
 106   }
 107   return std::string();
 108 }
 109
 110 // static
 111 std::string VersionLoader::ParseFirmware(const std::string& contents) {
 112   // The file contains lines such as:
 113   // vendor           | ...
 114   // version          | ...
 115   // release_date     | ...
 116   // We don't make any assumption that the spaces between "version" and "|" is
 117   //   fixed. So we just match kFirmwarePrefix at the start of the line and find
 118   //   the first character that is not "|" or space
 119
 120   std::vector<std::string> lines;
 121   base::SplitString(contents, '\n', &lines);
 122   for (size_t i = 0; i < lines.size(); ++i) {
 123     if (StartsWithASCII(lines[i], kFirmwarePrefix, false)) {
 124       std::string str = lines[i].substr(std::string(kFirmwarePrefix).size());
 125       size_t found = str.find_first_not_of("| ");
 126       if (found != std::string::npos)
 127         return str.substr(found);
 128     }
 129   }
 130   return std::string();
 131 }
 132
 133 void VersionLoader::Backend::GetVersion(
 134     scoped_refptr<GetVersionRequest> request,
 135     VersionFormat format) {
 136   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
 137   if (request->canceled())
 138     return;
 139
 140   std::string version;
 141   std::string contents;
 142   const FilePath file_path(kPathVersion);
 143   if (file_util::ReadFileToString(file_path, &contents)) {
 144     version = ParseVersion(
 145         contents,
 146         (format == VERSION_FULL) ? kFullVersionPrefix : kVersionPrefix);
 147   }
 148
 149   if (format == VERSION_SHORT_WITH_DATE) {
 150     base::PlatformFileInfo fileinfo;
 151     if (file_util::GetFileInfo(file_path, &fileinfo)) {
 152       base::Time::Exploded ctime;
 153       fileinfo.creation_time.UTCExplode(&ctime);
 154       version += base::StringPrintf("-%02u.%02u.%02u",
 155                                     ctime.year % 100,
 156                                     ctime.month,
 157                                     ctime.day_of_month);
 158     }
 159   }
 160
 161   request->ForwardResult(request->handle(), version);
 162 }
 163
 164 void VersionLoader::Backend::GetFirmware(
 165     scoped_refptr<GetFirmwareRequest> request) {
 166   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
 167   if (request->canceled())
 168     return;
 169
 170   std::string firmware;
 171   std::string contents;
 172   const FilePath file_path(kPathFirmware);
 173   if (file_util::ReadFileToString(file_path, &contents)) {
 174     firmware = ParseFirmware(contents);
 175   }
 176
 177   request->ForwardResult(request->handle(), firmware);
 178 }
 179
 180 }  // namespace chromeos