1  // Copyright (c) 2011-present The Bitcoin Core developers
 2  // Distributed under the MIT software license, see the accompanying
 3  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 4  
 5  #include <qt/freespacechecker.h>
 6  
 7  #include <qt/guiutil.h>
 8  #include <util/fs.h>
 9  
10  #include <QDir>
11  #include <QString>
12  
13  #include <cstdint>
14  
15  void FreespaceChecker::check()
16  {
17      QString dataDirStr = intro->getPathToCheck();
18      fs::path dataDir = GUIUtil::QStringToPath(dataDirStr);
19      uint64_t freeBytesAvailable = 0;
20      int replyStatus = ST_OK;
21      QString replyMessage = tr("A new data directory will be created.");
22  
23      /* Find first parent that exists, so that fs::space does not fail */
24      fs::path parentDir = dataDir;
25      fs::path parentDirOld = fs::path();
26      while(parentDir.has_parent_path() && !fs::exists(parentDir))
27      {
28          parentDir = parentDir.parent_path();
29  
30          /* Check if we make any progress, break if not to prevent an infinite loop here */
31          if (parentDirOld == parentDir)
32              break;
33  
34          parentDirOld = parentDir;
35      }
36  
37      try {
38          freeBytesAvailable = fs::space(parentDir).available;
39          if(fs::exists(dataDir))
40          {
41              if(fs::is_directory(dataDir))
42              {
43                  QString separator = "<code>" + QDir::toNativeSeparators("/") + tr("name") + "</code>";
44                  replyStatus = ST_OK;
45                  replyMessage = tr("Directory already exists. Add %1 if you intend to create a new directory here.").arg(separator);
46              } else {
47                  replyStatus = ST_ERROR;
48                  replyMessage = tr("Path already exists, and is not a directory.");
49              }
50          }
51      } catch (const fs::filesystem_error&)
52      {
53          /* Parent directory does not exist or is not accessible */
54          replyStatus = ST_ERROR;
55          replyMessage = tr("Cannot create data directory here.");
56      }
57      Q_EMIT reply(replyStatus, replyMessage, freeBytesAvailable);
58  }