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      1 // Copyright 2013 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/sxs_linux.h"
      6 
      7 #include <vector>
      8 
      9 #include "base/command_line.h"
     10 #include "base/files/file_path.h"
     11 #include "base/files/file_util.h"
     12 #include "base/files/important_file_writer.h"
     13 #include "base/logging.h"
     14 #include "base/path_service.h"
     15 #include "base/strings/string_split.h"
     16 #include "base/strings/string_util.h"
     17 #include "chrome/common/chrome_paths.h"
     18 #include "chrome/common/chrome_result_codes.h"
     19 #include "chrome/common/chrome_switches.h"
     20 #include "chrome/common/chrome_version_info.h"
     21 #include "content/public/browser/browser_thread.h"
     22 
     23 namespace {
     24 
     25 const char kChannelsFileName[] = "Channels";
     26 
     27 std::string GetChannelMarkForThisExecutable() {
     28   std::string product_channel_name;
     29   chrome::VersionInfo::Channel product_channel(
     30       chrome::VersionInfo::GetChannel());
     31   switch (product_channel) {
     32     case chrome::VersionInfo::CHANNEL_UNKNOWN: {
     33       // Add the channel mark even for Chromium builds (which do not have
     34       // channel) to better handle possibility of users using Chromium builds
     35       // with their Google Chrome profiles. Include version string modifier
     36       // as additional piece of information for debugging (it can't make
     37       // a meaningful difference for the code since unknown does not match any
     38       // real channel name).
     39       std::string version_string_modifier(
     40           chrome::VersionInfo::GetVersionStringModifier());
     41       product_channel_name = "unknown (" + version_string_modifier + ")";
     42       break;
     43     }
     44     case chrome::VersionInfo::CHANNEL_CANARY:
     45       product_channel_name = "canary";
     46       break;
     47     case chrome::VersionInfo::CHANNEL_DEV:
     48       product_channel_name = "dev";
     49       break;
     50     case chrome::VersionInfo::CHANNEL_BETA:
     51       product_channel_name = "beta";
     52       break;
     53     case chrome::VersionInfo::CHANNEL_STABLE:
     54       product_channel_name = "stable";
     55       break;
     56     // Rely on -Wswitch compiler warning to detect unhandled enum values.
     57   }
     58 
     59   return product_channel_name;
     60 }
     61 
     62 bool DoAddChannelMarkToUserDataDir(const base::FilePath& user_data_dir) {
     63   std::string product_channel_name(GetChannelMarkForThisExecutable());
     64   base::FilePath channels_path(user_data_dir.AppendASCII(kChannelsFileName));
     65   std::vector<std::string> user_data_dir_channels;
     66 
     67   // Note: failure to read the channels file is not fatal. It's possible
     68   // and legitimate that it doesn't exist, e.g. for new profile or for profile
     69   // existing before channel marks have been introduced.
     70   std::string channels_contents;
     71   if (base::ReadFileToString(channels_path, &channels_contents))
     72     base::SplitString(channels_contents, '\n', &user_data_dir_channels);
     73 
     74   if (std::find(user_data_dir_channels.begin(),
     75                 user_data_dir_channels.end(),
     76                 product_channel_name) != user_data_dir_channels.end()) {
     77     // No need to do further disk writes if our channel mark is already present.
     78     return true;
     79   }
     80 
     81   user_data_dir_channels.push_back(product_channel_name);
     82   return base::ImportantFileWriter::WriteFileAtomically(
     83       channels_path,
     84       JoinString(user_data_dir_channels, "\n"));
     85 }
     86 
     87 }  // namespace
     88 
     89 namespace sxs_linux {
     90 
     91 void AddChannelMarkToUserDataDir() {
     92   DCHECK(content::BrowserThread::GetBlockingPool()->RunsTasksOnCurrentThread());
     93   base::FilePath user_data_dir;
     94   if (!PathService::Get(chrome::DIR_USER_DATA, &user_data_dir)) {
     95     LOG(ERROR) << "Failed to get user data dir path. The profile will not be "
     96                << "automatically migrated for updated Linux packages.";
     97     return;
     98   }
     99 
    100   if (!DoAddChannelMarkToUserDataDir(user_data_dir)) {
    101     LOG(ERROR) << "Failed to add channel mark to the user data dir ("
    102                << user_data_dir.value() << "). This profile will not be "
    103                << "automatically migrated for updated Linux packages.";
    104   }
    105 }
    106 
    107 bool ShouldMigrateUserDataDir() {
    108   return base::CommandLine::ForCurrentProcess()->HasSwitch(
    109       switches::kMigrateDataDirForSxS);
    110 }
    111 
    112 int MigrateUserDataDir() {
    113   DCHECK(ShouldMigrateUserDataDir());
    114 
    115   base::FilePath source_path;
    116   if (!PathService::Get(chrome::DIR_USER_DATA, &source_path)) {
    117     LOG(ERROR) << "Failed to get value of chrome::DIR_USER_DATA";
    118     return chrome::RESULT_CODE_SXS_MIGRATION_FAILED;
    119   }
    120 
    121   base::FilePath channels_path(source_path.AppendASCII(kChannelsFileName));
    122 
    123   std::string channels_contents;
    124   if (!base::ReadFileToString(channels_path, &channels_contents)) {
    125     LOG(WARNING) << "Failed to read channels file.";
    126     return chrome::RESULT_CODE_SXS_MIGRATION_FAILED;
    127   }
    128 
    129   std::vector<std::string> user_data_dir_channels;
    130   base::SplitString(channels_contents, '\n', &user_data_dir_channels);
    131 
    132   if (user_data_dir_channels.size() != 1) {
    133     LOG(WARNING) << "User data dir migration is only possible when the profile "
    134                  << "is only used with a single channel.";
    135     return chrome::RESULT_CODE_SXS_MIGRATION_FAILED;
    136   }
    137 
    138   if (user_data_dir_channels[0] != GetChannelMarkForThisExecutable()) {
    139     LOG(WARNING) << "User data dir migration is only possible when the profile "
    140                  << "is used with the same channel.";
    141     return chrome::RESULT_CODE_SXS_MIGRATION_FAILED;
    142   }
    143 
    144   base::FilePath target_path =
    145       base::CommandLine::ForCurrentProcess()->GetSwitchValuePath(
    146           switches::kMigrateDataDirForSxS);
    147 
    148   if (!base::Move(source_path, target_path)) {
    149     LOG(ERROR) << "Failed to rename '" << source_path.value()
    150                << "' to '" << target_path.value() << "'";
    151     return chrome::RESULT_CODE_SXS_MIGRATION_FAILED;
    152   }
    153 
    154   return content::RESULT_CODE_NORMAL_EXIT;
    155 }
    156 
    157 }  // namespace sxs_linux
    158