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 "base/sys_info.h"
6
7 #include "base/basictypes.h"
8 #include "base/file_path.h"
9 #include "base/file_util.h"
10 #include "base/lazy_instance.h"
11 #include "base/string_number_conversions.h"
12 #include "base/string_tokenizer.h"
13 #include "base/threading/thread_restrictions.h"
14
15 #include <execinfo.h>
16
17 namespace base {
18
19 static const char* kLinuxStandardBaseVersionKeys[] = {
20 "CHROMEOS_RELEASE_VERSION",
21 "GOOGLE_RELEASE",
22 "DISTRIB_RELEASE",
23 NULL
24 };
25
26 const char kLinuxStandardBaseReleaseFile[] = "/etc/lsb-release";
27
28 struct ChromeOSVersionNumbers {
ChromeOSVersionNumbersbase::ChromeOSVersionNumbers29 ChromeOSVersionNumbers()
30 : major_version(0),
31 minor_version(0),
32 bugfix_version(0),
33 parsed(false) {
34 }
35
36 int32 major_version;
37 int32 minor_version;
38 int32 bugfix_version;
39 bool parsed;
40 };
41
42 static base::LazyInstance<ChromeOSVersionNumbers>
43 g_chrome_os_version_numbers(base::LINKER_INITIALIZED);
44
45 // static
OperatingSystemVersionNumbers(int32 * major_version,int32 * minor_version,int32 * bugfix_version)46 void SysInfo::OperatingSystemVersionNumbers(int32* major_version,
47 int32* minor_version,
48 int32* bugfix_version) {
49 if (!g_chrome_os_version_numbers.Get().parsed) {
50 // The other implementations of SysInfo don't block on the disk.
51 // See http://code.google.com/p/chromium/issues/detail?id=60394
52 // Perhaps the caller ought to cache this?
53 // Temporary allowing while we work the bug out.
54 base::ThreadRestrictions::ScopedAllowIO allow_io;
55
56 FilePath path(kLinuxStandardBaseReleaseFile);
57 std::string contents;
58 if (file_util::ReadFileToString(path, &contents)) {
59 g_chrome_os_version_numbers.Get().parsed = true;
60 ParseLsbRelease(contents,
61 &(g_chrome_os_version_numbers.Get().major_version),
62 &(g_chrome_os_version_numbers.Get().minor_version),
63 &(g_chrome_os_version_numbers.Get().bugfix_version));
64 }
65 }
66 *major_version = g_chrome_os_version_numbers.Get().major_version;
67 *minor_version = g_chrome_os_version_numbers.Get().minor_version;
68 *bugfix_version = g_chrome_os_version_numbers.Get().bugfix_version;
69 }
70
71 // static
GetLinuxStandardBaseVersionKey()72 std::string SysInfo::GetLinuxStandardBaseVersionKey() {
73 return std::string(kLinuxStandardBaseVersionKeys[0]);
74 }
75
76 // static
ParseLsbRelease(const std::string & lsb_release,int32 * major_version,int32 * minor_version,int32 * bugfix_version)77 void SysInfo::ParseLsbRelease(const std::string& lsb_release,
78 int32* major_version,
79 int32* minor_version,
80 int32* bugfix_version) {
81 size_t version_key_index = std::string::npos;
82 for (int i = 0; kLinuxStandardBaseVersionKeys[i] != NULL; ++i) {
83 version_key_index = lsb_release.find(kLinuxStandardBaseVersionKeys[i]);
84 if (std::string::npos != version_key_index) {
85 break;
86 }
87 }
88 if (std::string::npos == version_key_index) {
89 return;
90 }
91
92 size_t start_index = lsb_release.find_first_of('=', version_key_index);
93 start_index++; // Move past '='.
94 size_t length = lsb_release.find_first_of('\n', start_index) - start_index;
95 std::string version = lsb_release.substr(start_index, length);
96 StringTokenizer tokenizer(version, ".");
97 // TODO(rkc): Ignore the 0. here; fix this once we move Chrome OS version
98 // numbers from the 0.xx.yyy.zz format to the xx.yyy.zz format.
99 // Refer to http://code.google.com/p/chromium-os/issues/detail?id=15789
100 for (int i = 0; i < 4 && tokenizer.GetNext(); i++) {
101 if (1 == i) {
102 StringToInt(tokenizer.token_begin(),
103 tokenizer.token_end(),
104 major_version);
105 *minor_version = *bugfix_version = 0;
106 } else if (2 == i) {
107 StringToInt(tokenizer.token_begin(),
108 tokenizer.token_end(),
109 minor_version);
110 } else { // 3 == i
111 StringToInt(tokenizer.token_begin(),
112 tokenizer.token_end(),
113 bugfix_version);
114 }
115 }
116 }
117
118 } // namespace base
119