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 <stddef.h>
8#include <stdint.h>
9
10#include "base/environment.h"
11#include "base/files/file.h"
12#include "base/files/file_path.h"
13#include "base/files/file_util.h"
14#include "base/lazy_instance.h"
15#include "base/macros.h"
16#include "base/strings/string_number_conversions.h"
17#include "base/strings/string_piece.h"
18#include "base/strings/string_split.h"
19#include "base/strings/string_tokenizer.h"
20#include "base/strings/string_util.h"
21#include "base/threading/thread_restrictions.h"
22
23namespace base {
24
25namespace {
26
27const char* const kLinuxStandardBaseVersionKeys[] = {
28  "CHROMEOS_RELEASE_VERSION",
29  "GOOGLE_RELEASE",
30  "DISTRIB_RELEASE",
31};
32
33const char kChromeOsReleaseNameKey[] = "CHROMEOS_RELEASE_NAME";
34
35const char* const kChromeOsReleaseNames[] = {
36  "Chrome OS",
37  "Chromium OS",
38};
39
40const char kLinuxStandardBaseReleaseFile[] = "/etc/lsb-release";
41
42const char kLsbReleaseKey[] = "LSB_RELEASE";
43const char kLsbReleaseTimeKey[] = "LSB_RELEASE_TIME";  // Seconds since epoch
44
45const char kLsbReleaseSourceKey[] = "lsb-release";
46const char kLsbReleaseSourceEnv[] = "env";
47const char kLsbReleaseSourceFile[] = "file";
48
49class ChromeOSVersionInfo {
50 public:
51  ChromeOSVersionInfo() {
52    Parse();
53  }
54
55  void Parse() {
56    lsb_release_map_.clear();
57    major_version_ = 0;
58    minor_version_ = 0;
59    bugfix_version_ = 0;
60    is_running_on_chromeos_ = false;
61
62    std::string lsb_release, lsb_release_time_str;
63    scoped_ptr<Environment> env(Environment::Create());
64    bool parsed_from_env =
65        env->GetVar(kLsbReleaseKey, &lsb_release) &&
66        env->GetVar(kLsbReleaseTimeKey, &lsb_release_time_str);
67    if (parsed_from_env) {
68      double us = 0;
69      if (StringToDouble(lsb_release_time_str, &us))
70        lsb_release_time_ = Time::FromDoubleT(us);
71    } else {
72      // If the LSB_RELEASE and LSB_RELEASE_TIME environment variables are not
73      // set, fall back to a blocking read of the lsb_release file. This should
74      // only happen in non Chrome OS environments.
75      ThreadRestrictions::ScopedAllowIO allow_io;
76      FilePath path(kLinuxStandardBaseReleaseFile);
77      ReadFileToString(path, &lsb_release);
78      File::Info fileinfo;
79      if (GetFileInfo(path, &fileinfo))
80        lsb_release_time_ = fileinfo.creation_time;
81    }
82    ParseLsbRelease(lsb_release);
83    // For debugging:
84    lsb_release_map_[kLsbReleaseSourceKey] =
85        parsed_from_env ? kLsbReleaseSourceEnv : kLsbReleaseSourceFile;
86  }
87
88  bool GetLsbReleaseValue(const std::string& key, std::string* value) {
89    SysInfo::LsbReleaseMap::const_iterator iter = lsb_release_map_.find(key);
90    if (iter == lsb_release_map_.end())
91      return false;
92    *value = iter->second;
93    return true;
94  }
95
96  void GetVersionNumbers(int32_t* major_version,
97                         int32_t* minor_version,
98                         int32_t* bugfix_version) {
99    *major_version = major_version_;
100    *minor_version = minor_version_;
101    *bugfix_version = bugfix_version_;
102  }
103
104  const Time& lsb_release_time() const { return lsb_release_time_; }
105  const SysInfo::LsbReleaseMap& lsb_release_map() const {
106    return lsb_release_map_;
107  }
108  bool is_running_on_chromeos() const { return is_running_on_chromeos_; }
109
110 private:
111  void ParseLsbRelease(const std::string& lsb_release) {
112    // Parse and cache lsb_release key pairs. There should only be a handful
113    // of entries so the overhead for this will be small, and it can be
114    // useful for debugging.
115    base::StringPairs pairs;
116    SplitStringIntoKeyValuePairs(lsb_release, '=', '\n', &pairs);
117    for (size_t i = 0; i < pairs.size(); ++i) {
118      std::string key, value;
119      TrimWhitespaceASCII(pairs[i].first, TRIM_ALL, &key);
120      TrimWhitespaceASCII(pairs[i].second, TRIM_ALL, &value);
121      if (key.empty())
122        continue;
123      lsb_release_map_[key] = value;
124    }
125    // Parse the version from the first matching recognized version key.
126    std::string version;
127    for (size_t i = 0; i < arraysize(kLinuxStandardBaseVersionKeys); ++i) {
128      std::string key = kLinuxStandardBaseVersionKeys[i];
129      if (GetLsbReleaseValue(key, &version) && !version.empty())
130        break;
131    }
132    StringTokenizer tokenizer(version, ".");
133    if (tokenizer.GetNext()) {
134      StringToInt(StringPiece(tokenizer.token_begin(), tokenizer.token_end()),
135                  &major_version_);
136    }
137    if (tokenizer.GetNext()) {
138      StringToInt(StringPiece(tokenizer.token_begin(), tokenizer.token_end()),
139                  &minor_version_);
140    }
141    if (tokenizer.GetNext()) {
142      StringToInt(StringPiece(tokenizer.token_begin(), tokenizer.token_end()),
143                  &bugfix_version_);
144    }
145
146    // Check release name for Chrome OS.
147    std::string release_name;
148    if (GetLsbReleaseValue(kChromeOsReleaseNameKey, &release_name)) {
149      for (size_t i = 0; i < arraysize(kChromeOsReleaseNames); ++i) {
150        if (release_name == kChromeOsReleaseNames[i]) {
151          is_running_on_chromeos_ = true;
152          break;
153        }
154      }
155    }
156  }
157
158  Time lsb_release_time_;
159  SysInfo::LsbReleaseMap lsb_release_map_;
160  int32_t major_version_;
161  int32_t minor_version_;
162  int32_t bugfix_version_;
163  bool is_running_on_chromeos_;
164};
165
166static LazyInstance<ChromeOSVersionInfo>
167    g_chrome_os_version_info = LAZY_INSTANCE_INITIALIZER;
168
169ChromeOSVersionInfo& GetChromeOSVersionInfo() {
170  return g_chrome_os_version_info.Get();
171}
172
173}  // namespace
174
175// static
176void SysInfo::OperatingSystemVersionNumbers(int32_t* major_version,
177                                            int32_t* minor_version,
178                                            int32_t* bugfix_version) {
179  return GetChromeOSVersionInfo().GetVersionNumbers(
180      major_version, minor_version, bugfix_version);
181}
182
183// static
184const SysInfo::LsbReleaseMap& SysInfo::GetLsbReleaseMap() {
185  return GetChromeOSVersionInfo().lsb_release_map();
186}
187
188// static
189bool SysInfo::GetLsbReleaseValue(const std::string& key, std::string* value) {
190  return GetChromeOSVersionInfo().GetLsbReleaseValue(key, value);
191}
192
193// static
194std::string SysInfo::GetLsbReleaseBoard() {
195  const char kMachineInfoBoard[] = "CHROMEOS_RELEASE_BOARD";
196  std::string board;
197  if (!GetLsbReleaseValue(kMachineInfoBoard, &board))
198    board = "unknown";
199  return board;
200}
201
202// static
203Time SysInfo::GetLsbReleaseTime() {
204  return GetChromeOSVersionInfo().lsb_release_time();
205}
206
207// static
208bool SysInfo::IsRunningOnChromeOS() {
209  return GetChromeOSVersionInfo().is_running_on_chromeos();
210}
211
212// static
213void SysInfo::SetChromeOSVersionInfoForTest(const std::string& lsb_release,
214                                            const Time& lsb_release_time) {
215  scoped_ptr<Environment> env(Environment::Create());
216  env->SetVar(kLsbReleaseKey, lsb_release);
217  env->SetVar(kLsbReleaseTimeKey,
218              DoubleToString(lsb_release_time.ToDoubleT()));
219  g_chrome_os_version_info.Get().Parse();
220}
221
222}  // namespace base
223