chrome/installer/util/logging_installer.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 <windows.h>
   6
   7 #include "chrome/installer/util/logging_installer.h"
   8
   9 #include "base/command_line.h"
  10 #include "base/files/file.h"
  11 #include "base/files/file_path.h"
  12 #include "base/files/file_util.h"
  13 #include "base/logging.h"
  14 #include "base/logging_win.h"
  15 #include "base/path_service.h"
  16 #include "base/strings/string_util.h"
  17 #include "base/strings/utf_string_conversions.h"
  18 #include "base/win/scoped_handle.h"
  19 #include "chrome/installer/util/master_preferences.h"
  20 #include "chrome/installer/util/master_preferences_constants.h"
  21 #include "chrome/installer/util/util_constants.h"
  22
  23 // {93BCE0BF-3FAF-43b1-9E28-BEB6FAB5ECE7}
  24 static const GUID kSetupTraceProvider = { 0x93bce0bf, 0x3faf, 0x43b1,
  25     { 0x9e, 0x28, 0xbe, 0xb6, 0xfa, 0xb5, 0xec, 0xe7 } };
  26
  27 namespace installer {
  28
  29 // This should be true for the period between the end of
  30 // InitInstallerLogging() and the beginning of EndInstallerLogging().
  31 bool installer_logging_ = false;
  32
  33 TruncateResult TruncateLogFileIfNeeded(const base::FilePath& log_file) {
  34   TruncateResult result = LOGFILE_UNTOUCHED;
  35
  36   int64 log_size = 0;
  37   if (base::GetFileSize(log_file, &log_size) &&
  38       log_size > kMaxInstallerLogFileSize) {
  39     // Cause the old log file to be deleted when we are done with it.
  40     uint32 file_flags = base::File::FLAG_OPEN |
  41                         base::File::FLAG_READ |
  42                         base::File::FLAG_SHARE_DELETE |
  43                         base::File::FLAG_DELETE_ON_CLOSE;
  44     base::File old_log_file(log_file, file_flags);
  45
  46     if (old_log_file.IsValid()) {
  47       result = LOGFILE_DELETED;
  48       base::FilePath tmp_log(log_file.value() + FILE_PATH_LITERAL(".tmp"));
  49       // Note that base::Move will attempt to replace existing files.
  50       if (base::Move(log_file, tmp_log)) {
  51         int64 offset = log_size - kTruncatedInstallerLogFileSize;
  52         std::string old_log_data(kTruncatedInstallerLogFileSize, 0);
  53         int bytes_read = old_log_file.Read(offset,
  54                                            &old_log_data[0],
  55                                            kTruncatedInstallerLogFileSize);
  56         if (bytes_read > 0 &&
  57             (bytes_read == base::WriteFile(log_file, &old_log_data[0],
  58                                            bytes_read) ||
  59              base::PathExists(log_file))) {
  60           result = LOGFILE_TRUNCATED;
  61         }
  62       }
  63     } else if (base::DeleteFile(log_file, false)) {
  64       // Couldn't get sufficient access to the log file, optimistically try to
  65       // delete it.
  66       result = LOGFILE_DELETED;
  67     }
  68   }
  69
  70   return result;
  71 }
  72
  73
  74 void InitInstallerLogging(const installer::MasterPreferences& prefs) {
  75   if (installer_logging_)
  76     return;
  77
  78   installer_logging_ = true;
  79
  80   bool value = false;
  81   if (prefs.GetBool(installer::master_preferences::kDisableLogging,
  82                     &value) && value) {
  83     return;
  84   }
  85
  86   base::FilePath log_file_path(GetLogFilePath(prefs));
  87   TruncateLogFileIfNeeded(log_file_path);
  88
  89   logging::LoggingSettings settings;
  90   settings.logging_dest = logging::LOG_TO_FILE;
  91   settings.log_file = log_file_path.value().c_str();
  92   logging::InitLogging(settings);
  93
  94   if (prefs.GetBool(installer::master_preferences::kVerboseLogging,
  95                     &value) && value) {
  96     logging::SetMinLogLevel(logging::LOG_VERBOSE);
  97   } else {
  98     logging::SetMinLogLevel(logging::LOG_ERROR);
  99   }
 100
 101   // Enable ETW logging.
 102   logging::LogEventProvider::Initialize(kSetupTraceProvider);
 103 }
 104
 105 void EndInstallerLogging() {
 106   logging::CloseLogFile();
 107
 108   installer_logging_ = false;
 109 }
 110
 111 base::FilePath GetLogFilePath(const installer::MasterPreferences& prefs) {
 112   std::string path;
 113   prefs.GetString(installer::master_preferences::kLogFile, &path);
 114   if (!path.empty())
 115     return base::FilePath(base::UTF8ToWide(path));
 116
 117   static const base::FilePath::CharType kLogFilename[] =
 118       FILE_PATH_LITERAL("chrome_installer.log");
 119
 120   // Fallback to current directory if getting the temp directory fails.
 121   base::FilePath tmp_path;
 122   ignore_result(PathService::Get(base::DIR_TEMP, &tmp_path));
 123   return tmp_path.Append(kLogFilename);
 124 }
 125
 126 }  // namespace installer