base/sys_info_chromeos.cc

   1 // Copyright (c) 2012 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 "base/sys_info.h"
   6
   7 #include "base/basictypes.h"
   8 #include "base/environment.h"
   9 #include "base/file_util.h"
  10 #include "base/files/file_path.h"
  11 #include "base/lazy_instance.h"
  12 #include "base/strings/string_number_conversions.h"
  13 #include "base/strings/string_piece.h"
  14 #include "base/strings/string_split.h"
  15 #include "base/strings/string_tokenizer.h"
  16 #include "base/strings/string_util.h"
  17 #include "base/threading/thread_restrictions.h"
  18
  19 namespace base {
  20
  21 namespace {
  22
  23 const char* kLinuxStandardBaseVersionKeys[] = {
  24   "CHROMEOS_RELEASE_VERSION",
  25   "GOOGLE_RELEASE",
  26   "DISTRIB_RELEASE",
  27 };
  28
  29 const char kChromeOsReleaseNameKey[] = "CHROMEOS_RELEASE_NAME";
  30
  31 const char* const kChromeOsReleaseNames[] = {
  32   "Chrome OS",
  33   "Chromium OS",
  34 };
  35
  36 const char kLinuxStandardBaseReleaseFile[] = "/etc/lsb-release";
  37
  38 const char kLsbReleaseKey[] = "LSB_RELEASE";
  39 const char kLsbReleaseTimeKey[] = "LSB_RELEASE_TIME";  // Seconds since epoch
  40
  41 const char kLsbReleaseSourceKey[] = "lsb-release";
  42 const char kLsbReleaseSourceEnv[] = "env";
  43 const char kLsbReleaseSourceFile[] = "file";
  44
  45 class ChromeOSVersionInfo {
  46  public:
  47   ChromeOSVersionInfo() {
  48     Parse();
  49   }
  50
  51   void Parse() {
  52     lsb_release_map_.clear();
  53     major_version_ = 0;
  54     minor_version_ = 0;
  55     bugfix_version_ = 0;
  56     is_running_on_chromeos_ = false;
  57
  58     std::string lsb_release, lsb_release_time_str;
  59     scoped_ptr<Environment> env(Environment::Create());
  60     bool parsed_from_env =
  61         env->GetVar(kLsbReleaseKey, &lsb_release) &&
  62         env->GetVar(kLsbReleaseTimeKey, &lsb_release_time_str);
  63     if (parsed_from_env) {
  64       double us = 0;
  65       if (StringToDouble(lsb_release_time_str, &us))
  66         lsb_release_time_ = Time::FromDoubleT(us);
  67     } else {
  68       // If the LSB_RELEASE and LSB_RELEASE_TIME environment variables are not
  69       // set, fall back to a blocking read of the lsb_release file. This should
  70       // only happen in non Chrome OS environments.
  71       ThreadRestrictions::ScopedAllowIO allow_io;
  72       FilePath path(kLinuxStandardBaseReleaseFile);
  73       ReadFileToString(path, &lsb_release);
  74       PlatformFileInfo fileinfo;
  75       if (GetFileInfo(path, &fileinfo))
  76         lsb_release_time_ = fileinfo.creation_time;
  77     }
  78     ParseLsbRelease(lsb_release);
  79     // For debugging:
  80     lsb_release_map_[kLsbReleaseSourceKey] =
  81         parsed_from_env ? kLsbReleaseSourceEnv : kLsbReleaseSourceFile;
  82   }
  83
  84   bool GetLsbReleaseValue(const std::string& key, std::string* value) {
  85     SysInfo::LsbReleaseMap::const_iterator iter = lsb_release_map_.find(key);
  86     if (iter == lsb_release_map_.end())
  87       return false;
  88     *value = iter->second;
  89     return true;
  90   }
  91
  92   void GetVersionNumbers(int32* major_version,
  93                          int32* minor_version,
  94                          int32* bugfix_version) {
  95     *major_version = major_version_;
  96     *minor_version = minor_version_;
  97     *bugfix_version = bugfix_version_;
  98   }
  99
 100   const Time& lsb_release_time() const { return lsb_release_time_; }
 101   const SysInfo::LsbReleaseMap& lsb_release_map() const {
 102     return lsb_release_map_;
 103   }
 104   bool is_running_on_chromeos() const { return is_running_on_chromeos_; }
 105
 106  private:
 107   void ParseLsbRelease(const std::string& lsb_release) {
 108     // Parse and cache lsb_release key pairs. There should only be a handful
 109     // of entries so the overhead for this will be small, and it can be
 110     // useful for debugging.
 111     std::vector<std::pair<std::string, std::string> > pairs;
 112     SplitStringIntoKeyValuePairs(lsb_release, '=', '\n', &pairs);
 113     for (size_t i = 0; i < pairs.size(); ++i) {
 114       std::string key, value;
 115       TrimWhitespaceASCII(pairs[i].first, TRIM_ALL, &key);
 116       TrimWhitespaceASCII(pairs[i].second, TRIM_ALL, &value);
 117       if (key.empty())
 118         continue;
 119       lsb_release_map_[key] = value;
 120     }
 121     // Parse the version from the first matching recognized version key.
 122     std::string version;
 123     for (size_t i = 0; i < arraysize(kLinuxStandardBaseVersionKeys); ++i) {
 124       std::string key = kLinuxStandardBaseVersionKeys[i];
 125       if (GetLsbReleaseValue(key, &version) && !version.empty())
 126         break;
 127     }
 128     StringTokenizer tokenizer(version, ".");
 129     if (tokenizer.GetNext()) {
 130       StringToInt(StringPiece(tokenizer.token_begin(), tokenizer.token_end()),
 131                   &major_version_);
 132     }
 133     if (tokenizer.GetNext()) {
 134       StringToInt(StringPiece(tokenizer.token_begin(), tokenizer.token_end()),
 135                   &minor_version_);
 136     }
 137     if (tokenizer.GetNext()) {
 138       StringToInt(StringPiece(tokenizer.token_begin(), tokenizer.token_end()),
 139                   &bugfix_version_);
 140     }
 141
 142     // Check release name for Chrome OS.
 143     std::string release_name;
 144     if (GetLsbReleaseValue(kChromeOsReleaseNameKey, &release_name)) {
 145       for (size_t i = 0; i < arraysize(kChromeOsReleaseNames); ++i) {
 146         if (release_name == kChromeOsReleaseNames[i]) {
 147           is_running_on_chromeos_ = true;
 148           break;
 149         }
 150       }
 151     }
 152   }
 153
 154   Time lsb_release_time_;
 155   SysInfo::LsbReleaseMap lsb_release_map_;
 156   int32 major_version_;
 157   int32 minor_version_;
 158   int32 bugfix_version_;
 159   bool is_running_on_chromeos_;
 160 };
 161
 162 static LazyInstance<ChromeOSVersionInfo>
 163     g_chrome_os_version_info = LAZY_INSTANCE_INITIALIZER;
 164
 165 ChromeOSVersionInfo& GetChromeOSVersionInfo() {
 166   return g_chrome_os_version_info.Get();
 167 }
 168
 169 }  // namespace
 170
 171 // static
 172 void SysInfo::OperatingSystemVersionNumbers(int32* major_version,
 173                                             int32* minor_version,
 174                                             int32* bugfix_version) {
 175   return GetChromeOSVersionInfo().GetVersionNumbers(
 176       major_version, minor_version, bugfix_version);
 177 }
 178
 179 // static
 180 const SysInfo::LsbReleaseMap& SysInfo::GetLsbReleaseMap() {
 181   return GetChromeOSVersionInfo().lsb_release_map();
 182 }
 183
 184 // static
 185 bool SysInfo::GetLsbReleaseValue(const std::string& key, std::string* value) {
 186   return GetChromeOSVersionInfo().GetLsbReleaseValue(key, value);
 187 }
 188
 189 // static
 190 std::string SysInfo::GetLsbReleaseBoard() {
 191   const char kMachineInfoBoard[] = "CHROMEOS_RELEASE_BOARD";
 192   std::string board;
 193   if (!GetLsbReleaseValue(kMachineInfoBoard, &board))
 194     board = "unknown";
 195   return board;
 196 }
 197
 198 // static
 199 Time SysInfo::GetLsbReleaseTime() {
 200   return GetChromeOSVersionInfo().lsb_release_time();
 201 }
 202
 203 // static
 204 bool SysInfo::IsRunningOnChromeOS() {
 205   return GetChromeOSVersionInfo().is_running_on_chromeos();
 206 }
 207
 208 // static
 209 void SysInfo::SetChromeOSVersionInfoForTest(const std::string& lsb_release,
 210                                             const Time& lsb_release_time) {
 211   scoped_ptr<Environment> env(Environment::Create());
 212   env->SetVar(kLsbReleaseKey, lsb_release);
 213   env->SetVar(kLsbReleaseTimeKey,
 214               DoubleToString(lsb_release_time.ToDoubleT()));
 215   g_chrome_os_version_info.Get().Parse();
 216 }
 217
 218 }  // namespace base