chrome/installer/util/move_tree_work_item.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 "chrome/installer/util/move_tree_work_item.h"
   6
   7 #include <shlwapi.h>
   8
   9 #include "base/files/file_util.h"
  10 #include "base/logging.h"
  11 #include "chrome/installer/util/duplicate_tree_detector.h"
  12 #include "chrome/installer/util/logging_installer.h"
  13
  14 MoveTreeWorkItem::~MoveTreeWorkItem() {
  15 }
  16
  17 MoveTreeWorkItem::MoveTreeWorkItem(const base::FilePath& source_path,
  18                                    const base::FilePath& dest_path,
  19                                    const base::FilePath& temp_dir,
  20                                    MoveTreeOption duplicate_option)
  21     : source_path_(source_path),
  22       dest_path_(dest_path),
  23       temp_dir_(temp_dir),
  24       moved_to_dest_path_(false),
  25       moved_to_backup_(false),
  26       source_moved_to_backup_(false),
  27       duplicate_option_(duplicate_option) {
  28 }
  29
  30 bool MoveTreeWorkItem::Do() {
  31   if (!base::PathExists(source_path_)) {
  32     LOG(ERROR) << source_path_.value() << " does not exist";
  33     return false;
  34   }
  35
  36   // If dest_path_ exists, we can do one of two things:
  37   // 1) If the contents of src_path_are already fully contained in dest_path_
  38   //    then do nothing and return success. Fully contained means the full
  39   //    file structure with identical files is contained in dest_path_. For
  40   //    Chrome, if dest_path_ exists, this is expected to be the common case.
  41   // 2) If the contents of src_path_ are NOT fully contained in dest_path_, we
  42   //    attempt to backup dest_path_ and replace it with src_path_. This will
  43   //    fail if files in dest_path_ are in use.
  44   if (base::PathExists(dest_path_)) {
  45     // Generate a backup path that can keep the original files under dest_path_.
  46     if (!backup_path_.CreateUniqueTempDirUnderPath(temp_dir_)) {
  47       PLOG(ERROR) << "Failed to get backup path in folder "
  48                   << temp_dir_.value();
  49       return false;
  50     }
  51     base::FilePath backup = backup_path_.path().Append(dest_path_.BaseName());
  52
  53     if (duplicate_option_ == CHECK_DUPLICATES) {
  54       if (installer::IsIdenticalFileHierarchy(source_path_, dest_path_)) {
  55         // The files we are moving are already present in the destination path.
  56         // We most likely don't need to do anything. As such, just move the
  57         // source files to the temp folder as backup.
  58         if (base::Move(source_path_, backup)) {
  59           source_moved_to_backup_ = true;
  60           VLOG(1) << "Moved source " << source_path_.value()
  61                   << " to backup path " << backup.value();
  62           return true;
  63         } else {
  64           // We failed to move the source tree to the backup path. This is odd
  65           // but just fall through and attempt the regular behaviour as well.
  66           LOG(ERROR) << "Failed to backup source " << source_path_.value()
  67                      << " to backup path " << backup.value()
  68                      << " for duplicate trees. Trying regular Move instead.";
  69         }
  70       } else {
  71         VLOG(1) << "Source path " << source_path_.value()
  72                 << " differs from " << dest_path_.value()
  73                 << ", updating now.";
  74       }
  75     }
  76
  77     if (base::Move(dest_path_, backup)) {
  78       moved_to_backup_ = true;
  79       VLOG(1) << "Moved destination " << dest_path_.value()
  80               << " to backup path " << backup.value();
  81     } else {
  82       PLOG(ERROR) << "failed moving " << dest_path_.value()
  83                   << " to " << backup.value();
  84       return false;
  85     }
  86   }
  87
  88   // Now move source to destination.
  89   if (base::Move(source_path_, dest_path_)) {
  90     moved_to_dest_path_ = true;
  91     VLOG(1) << "Moved source " << source_path_.value()
  92             << " to destination " << dest_path_.value();
  93   } else {
  94     PLOG(ERROR) << "failed move " << source_path_.value()
  95                 << " to " << dest_path_.value();
  96     return false;
  97   }
  98
  99   return true;
 100 }
 101
 102 void MoveTreeWorkItem::Rollback() {
 103   if (moved_to_dest_path_ && !base::Move(dest_path_, source_path_))
 104     LOG(ERROR) << "Can not move " << dest_path_.value()
 105                << " to " << source_path_.value();
 106
 107   base::FilePath backup = backup_path_.path().Append(dest_path_.BaseName());
 108   if (moved_to_backup_ && !base::Move(backup, dest_path_)) {
 109     LOG(ERROR) << "failed move " << backup.value()
 110                << " to " << dest_path_.value();
 111   }
 112
 113   if (source_moved_to_backup_ && !base::Move(backup, source_path_)) {
 114     LOG(ERROR) << "Can not restore " << backup.value()
 115                << " to " << source_path_.value();
 116   }
 117 }